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 if (h
->root
.type
!= bfd_link_hash_undefined
)
205 if (h
->root
.type
!= bfd_link_hash_undefweak
)
210 /* We need to include this archive member. */
212 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
213 if (element
== (bfd
*) NULL
)
216 if (! bfd_check_format (element
, bfd_object
))
219 /* Doublecheck that we have not included this object
220 already--it should be impossible, but there may be
221 something wrong with the archive. */
222 if (element
->archive_pass
!= 0)
224 bfd_set_error (bfd_error_bad_value
);
227 element
->archive_pass
= 1;
229 undefs_tail
= info
->hash
->undefs_tail
;
231 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
234 if (! elf_link_add_object_symbols (element
, info
))
237 /* If there are any new undefined symbols, we need to make
238 another pass through the archive in order to see whether
239 they can be defined. FIXME: This isn't perfect, because
240 common symbols wind up on undefs_tail and because an
241 undefined symbol which is defined later on in this pass
242 does not require another pass. This isn't a bug, but it
243 does make the code less efficient than it could be. */
244 if (undefs_tail
!= info
->hash
->undefs_tail
)
247 /* Look backward to mark all symbols from this object file
248 which we have already seen in this pass. */
252 included
[mark
] = true;
257 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
259 /* We mark subsequent symbols from this object file as we go
260 on through the loop. */
261 last
= symdef
->file_offset
;
272 if (defined
!= (boolean
*) NULL
)
274 if (included
!= (boolean
*) NULL
)
279 /* This function is called when we want to define a new symbol. It
280 handles the various cases which arise when we find a definition in
281 a dynamic object, or when there is already a definition in a
282 dynamic object. The new symbol is described by NAME, SYM, PSEC,
283 and PVALUE. We set SYM_HASH to the hash table entry. We set
284 OVERRIDE if the old symbol is overriding a new definition. We set
285 TYPE_CHANGE_OK if it is OK for the type to change. We set
286 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
287 change, we mean that we shouldn't warn if the type or size does
291 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
292 override
, type_change_ok
, size_change_ok
)
294 struct bfd_link_info
*info
;
296 Elf_Internal_Sym
*sym
;
299 struct elf_link_hash_entry
**sym_hash
;
301 boolean
*type_change_ok
;
302 boolean
*size_change_ok
;
305 struct elf_link_hash_entry
*h
;
308 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
313 bind
= ELF_ST_BIND (sym
->st_info
);
315 if (! bfd_is_und_section (sec
))
316 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
318 h
= ((struct elf_link_hash_entry
*)
319 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
324 /* This code is for coping with dynamic objects, and is only useful
325 if we are doing an ELF link. */
326 if (info
->hash
->creator
!= abfd
->xvec
)
329 /* For merging, we only care about real symbols. */
331 while (h
->root
.type
== bfd_link_hash_indirect
332 || h
->root
.type
== bfd_link_hash_warning
)
333 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
335 /* If we just created the symbol, mark it as being an ELF symbol.
336 Other than that, there is nothing to do--there is no merge issue
337 with a newly defined symbol--so we just return. */
339 if (h
->root
.type
== bfd_link_hash_new
)
341 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
345 /* OLDBFD is a BFD associated with the existing symbol. */
347 switch (h
->root
.type
)
353 case bfd_link_hash_undefined
:
354 case bfd_link_hash_undefweak
:
355 oldbfd
= h
->root
.u
.undef
.abfd
;
358 case bfd_link_hash_defined
:
359 case bfd_link_hash_defweak
:
360 oldbfd
= h
->root
.u
.def
.section
->owner
;
363 case bfd_link_hash_common
:
364 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
368 /* In cases involving weak versioned symbols, we may wind up trying
369 to merge a symbol with itself. Catch that here, to avoid the
370 confusion that results if we try to override a symbol with
371 itself. The additional tests catch cases like
372 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
373 dynamic object, which we do want to handle here. */
375 && ((abfd
->flags
& DYNAMIC
) == 0
376 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
379 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
380 respectively, is from a dynamic object. */
382 if ((abfd
->flags
& DYNAMIC
) != 0)
388 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
393 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
394 indices used by MIPS ELF. */
395 switch (h
->root
.type
)
401 case bfd_link_hash_defined
:
402 case bfd_link_hash_defweak
:
403 hsec
= h
->root
.u
.def
.section
;
406 case bfd_link_hash_common
:
407 hsec
= h
->root
.u
.c
.p
->section
;
414 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
417 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
418 respectively, appear to be a definition rather than reference. */
420 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
425 if (h
->root
.type
== bfd_link_hash_undefined
426 || h
->root
.type
== bfd_link_hash_undefweak
427 || h
->root
.type
== bfd_link_hash_common
)
432 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
433 symbol, respectively, appears to be a common symbol in a dynamic
434 object. If a symbol appears in an uninitialized section, and is
435 not weak, and is not a function, then it may be a common symbol
436 which was resolved when the dynamic object was created. We want
437 to treat such symbols specially, because they raise special
438 considerations when setting the symbol size: if the symbol
439 appears as a common symbol in a regular object, and the size in
440 the regular object is larger, we must make sure that we use the
441 larger size. This problematic case can always be avoided in C,
442 but it must be handled correctly when using Fortran shared
445 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
446 likewise for OLDDYNCOMMON and OLDDEF.
448 Note that this test is just a heuristic, and that it is quite
449 possible to have an uninitialized symbol in a shared object which
450 is really a definition, rather than a common symbol. This could
451 lead to some minor confusion when the symbol really is a common
452 symbol in some regular object. However, I think it will be
457 && (sec
->flags
& SEC_ALLOC
) != 0
458 && (sec
->flags
& SEC_LOAD
) == 0
461 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
464 newdyncommon
= false;
468 && h
->root
.type
== bfd_link_hash_defined
469 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
470 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
471 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
473 && h
->type
!= STT_FUNC
)
476 olddyncommon
= false;
478 /* It's OK to change the type if either the existing symbol or the
479 new symbol is weak. */
481 if (h
->root
.type
== bfd_link_hash_defweak
482 || h
->root
.type
== bfd_link_hash_undefweak
484 *type_change_ok
= true;
486 /* It's OK to change the size if either the existing symbol or the
487 new symbol is weak, or if the old symbol is undefined. */
490 || h
->root
.type
== bfd_link_hash_undefined
)
491 *size_change_ok
= true;
493 /* If both the old and the new symbols look like common symbols in a
494 dynamic object, set the size of the symbol to the larger of the
499 && sym
->st_size
!= h
->size
)
501 /* Since we think we have two common symbols, issue a multiple
502 common warning if desired. Note that we only warn if the
503 size is different. If the size is the same, we simply let
504 the old symbol override the new one as normally happens with
505 symbols defined in dynamic objects. */
507 if (! ((*info
->callbacks
->multiple_common
)
508 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
509 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
512 if (sym
->st_size
> h
->size
)
513 h
->size
= sym
->st_size
;
515 *size_change_ok
= true;
518 /* If we are looking at a dynamic object, and we have found a
519 definition, we need to see if the symbol was already defined by
520 some other object. If so, we want to use the existing
521 definition, and we do not want to report a multiple symbol
522 definition error; we do this by clobbering *PSEC to be
525 We treat a common symbol as a definition if the symbol in the
526 shared library is a function, since common symbols always
527 represent variables; this can cause confusion in principle, but
528 any such confusion would seem to indicate an erroneous program or
529 shared library. We also permit a common symbol in a regular
530 object to override a weak symbol in a shared object.
532 We prefer a non-weak definition in a shared library to a weak
533 definition in the executable. */
538 || (h
->root
.type
== bfd_link_hash_common
540 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
541 && (h
->root
.type
!= bfd_link_hash_defweak
542 || bind
== STB_WEAK
))
546 newdyncommon
= false;
548 *psec
= sec
= bfd_und_section_ptr
;
549 *size_change_ok
= true;
551 /* If we get here when the old symbol is a common symbol, then
552 we are explicitly letting it override a weak symbol or
553 function in a dynamic object, and we don't want to warn about
554 a type change. If the old symbol is a defined symbol, a type
555 change warning may still be appropriate. */
557 if (h
->root
.type
== bfd_link_hash_common
)
558 *type_change_ok
= true;
561 /* Handle the special case of an old common symbol merging with a
562 new symbol which looks like a common symbol in a shared object.
563 We change *PSEC and *PVALUE to make the new symbol look like a
564 common symbol, and let _bfd_generic_link_add_one_symbol will do
568 && h
->root
.type
== bfd_link_hash_common
)
572 newdyncommon
= false;
573 *pvalue
= sym
->st_size
;
574 *psec
= sec
= bfd_com_section_ptr
;
575 *size_change_ok
= true;
578 /* If the old symbol is from a dynamic object, and the new symbol is
579 a definition which is not from a dynamic object, then the new
580 symbol overrides the old symbol. Symbols from regular files
581 always take precedence over symbols from dynamic objects, even if
582 they are defined after the dynamic object in the link.
584 As above, we again permit a common symbol in a regular object to
585 override a definition in a shared object if the shared object
586 symbol is a function or is weak.
588 As above, we permit a non-weak definition in a shared object to
589 override a weak definition in a regular object. */
593 || (bfd_is_com_section (sec
)
594 && (h
->root
.type
== bfd_link_hash_defweak
595 || h
->type
== STT_FUNC
)))
598 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
600 || h
->root
.type
== bfd_link_hash_defweak
))
602 /* Change the hash table entry to undefined, and let
603 _bfd_generic_link_add_one_symbol do the right thing with the
606 h
->root
.type
= bfd_link_hash_undefined
;
607 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
608 *size_change_ok
= true;
611 olddyncommon
= false;
613 /* We again permit a type change when a common symbol may be
614 overriding a function. */
616 if (bfd_is_com_section (sec
))
617 *type_change_ok
= true;
619 /* This union may have been set to be non-NULL when this symbol
620 was seen in a dynamic object. We must force the union to be
621 NULL, so that it is correct for a regular symbol. */
623 h
->verinfo
.vertree
= NULL
;
625 /* In this special case, if H is the target of an indirection,
626 we want the caller to frob with H rather than with the
627 indirect symbol. That will permit the caller to redefine the
628 target of the indirection, rather than the indirect symbol
629 itself. FIXME: This will break the -y option if we store a
630 symbol with a different name. */
634 /* Handle the special case of a new common symbol merging with an
635 old symbol that looks like it might be a common symbol defined in
636 a shared object. Note that we have already handled the case in
637 which a new common symbol should simply override the definition
638 in the shared library. */
641 && bfd_is_com_section (sec
)
644 /* It would be best if we could set the hash table entry to a
645 common symbol, but we don't know what to use for the section
647 if (! ((*info
->callbacks
->multiple_common
)
648 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
649 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
652 /* If the predumed common symbol in the dynamic object is
653 larger, pretend that the new symbol has its size. */
655 if (h
->size
> *pvalue
)
658 /* FIXME: We no longer know the alignment required by the symbol
659 in the dynamic object, so we just wind up using the one from
660 the regular object. */
663 olddyncommon
= false;
665 h
->root
.type
= bfd_link_hash_undefined
;
666 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
668 *size_change_ok
= true;
669 *type_change_ok
= true;
671 h
->verinfo
.vertree
= NULL
;
674 /* Handle the special case of a weak definition in a regular object
675 followed by a non-weak definition in a shared object. In this
676 case, we prefer the definition in the shared object. */
678 && h
->root
.type
== bfd_link_hash_defweak
683 /* To make this work we have to frob the flags so that the rest
684 of the code does not think we are using the regular
686 h
->elf_link_hash_flags
&= ~ ELF_LINK_HASH_DEF_REGULAR
;
687 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
689 /* If H is the target of an indirection, we want the caller to
690 use H rather than the indirect symbol. Otherwise if we are
691 defining a new indirect symbol we will wind up attaching it
692 to the entry we are overriding. */
696 /* Handle the special case of a non-weak definition in a shared
697 object followed by a weak definition in a regular object. In
698 this case we prefer to definition in the shared object. To make
699 this work we have to tell the caller to not treat the new symbol
703 && h
->root
.type
!= bfd_link_hash_defweak
712 /* Add symbols from an ELF object file to the linker hash table. */
715 elf_link_add_object_symbols (abfd
, info
)
717 struct bfd_link_info
*info
;
719 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
720 const Elf_Internal_Sym
*,
721 const char **, flagword
*,
722 asection
**, bfd_vma
*));
723 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
724 asection
*, const Elf_Internal_Rela
*));
726 Elf_Internal_Shdr
*hdr
;
730 Elf_External_Sym
*buf
= NULL
;
731 struct elf_link_hash_entry
**sym_hash
;
733 bfd_byte
*dynver
= NULL
;
734 Elf_External_Versym
*extversym
= NULL
;
735 Elf_External_Versym
*ever
;
736 Elf_External_Dyn
*dynbuf
= NULL
;
737 struct elf_link_hash_entry
*weaks
;
738 Elf_External_Sym
*esym
;
739 Elf_External_Sym
*esymend
;
741 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
742 collect
= get_elf_backend_data (abfd
)->collect
;
744 if ((abfd
->flags
& DYNAMIC
) == 0)
750 /* You can't use -r against a dynamic object. Also, there's no
751 hope of using a dynamic object which does not exactly match
752 the format of the output file. */
753 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
755 bfd_set_error (bfd_error_invalid_operation
);
760 /* As a GNU extension, any input sections which are named
761 .gnu.warning.SYMBOL are treated as warning symbols for the given
762 symbol. This differs from .gnu.warning sections, which generate
763 warnings when they are included in an output file. */
768 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
772 name
= bfd_get_section_name (abfd
, s
);
773 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
778 name
+= sizeof ".gnu.warning." - 1;
780 /* If this is a shared object, then look up the symbol
781 in the hash table. If it is there, and it is already
782 been defined, then we will not be using the entry
783 from this shared object, so we don't need to warn.
784 FIXME: If we see the definition in a regular object
785 later on, we will warn, but we shouldn't. The only
786 fix is to keep track of what warnings we are supposed
787 to emit, and then handle them all at the end of the
789 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
791 struct elf_link_hash_entry
*h
;
793 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
796 /* FIXME: What about bfd_link_hash_common? */
798 && (h
->root
.type
== bfd_link_hash_defined
799 || h
->root
.type
== bfd_link_hash_defweak
))
801 /* We don't want to issue this warning. Clobber
802 the section size so that the warning does not
803 get copied into the output file. */
809 sz
= bfd_section_size (abfd
, s
);
810 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
814 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
819 if (! (_bfd_generic_link_add_one_symbol
820 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
821 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
824 if (! info
->relocateable
)
826 /* Clobber the section size so that the warning does
827 not get copied into the output file. */
834 /* If this is a dynamic object, we always link against the .dynsym
835 symbol table, not the .symtab symbol table. The dynamic linker
836 will only see the .dynsym symbol table, so there is no reason to
837 look at .symtab for a dynamic object. */
839 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
840 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
842 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
846 /* Read in any version definitions. */
848 if (! _bfd_elf_slurp_version_tables (abfd
))
851 /* Read in the symbol versions, but don't bother to convert them
852 to internal format. */
853 if (elf_dynversym (abfd
) != 0)
855 Elf_Internal_Shdr
*versymhdr
;
857 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
858 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
859 if (extversym
== NULL
)
861 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
862 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
863 != versymhdr
->sh_size
))
868 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
870 /* The sh_info field of the symtab header tells us where the
871 external symbols start. We don't care about the local symbols at
873 if (elf_bad_symtab (abfd
))
875 extsymcount
= symcount
;
880 extsymcount
= symcount
- hdr
->sh_info
;
881 extsymoff
= hdr
->sh_info
;
884 buf
= ((Elf_External_Sym
*)
885 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
886 if (buf
== NULL
&& extsymcount
!= 0)
889 /* We store a pointer to the hash table entry for each external
891 sym_hash
= ((struct elf_link_hash_entry
**)
893 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
894 if (sym_hash
== NULL
)
896 elf_sym_hashes (abfd
) = sym_hash
;
900 /* If we are creating a shared library, create all the dynamic
901 sections immediately. We need to attach them to something,
902 so we attach them to this BFD, provided it is the right
903 format. FIXME: If there are no input BFD's of the same
904 format as the output, we can't make a shared library. */
906 && ! elf_hash_table (info
)->dynamic_sections_created
907 && abfd
->xvec
== info
->hash
->creator
)
909 if (! elf_link_create_dynamic_sections (abfd
, info
))
918 bfd_size_type oldsize
;
919 bfd_size_type strindex
;
921 /* Find the name to use in a DT_NEEDED entry that refers to this
922 object. If the object has a DT_SONAME entry, we use it.
923 Otherwise, if the generic linker stuck something in
924 elf_dt_name, we use that. Otherwise, we just use the file
925 name. If the generic linker put a null string into
926 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
927 there is a DT_SONAME entry. */
929 name
= bfd_get_filename (abfd
);
930 if (elf_dt_name (abfd
) != NULL
)
932 name
= elf_dt_name (abfd
);
936 s
= bfd_get_section_by_name (abfd
, ".dynamic");
939 Elf_External_Dyn
*extdyn
;
940 Elf_External_Dyn
*extdynend
;
944 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
948 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
949 (file_ptr
) 0, s
->_raw_size
))
952 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
955 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
958 /* The shared libraries distributed with hpux11 have a bogus
959 sh_link field for the ".dynamic" section. This code detects
960 when LINK refers to a section that is not a string table and
961 tries to find the string table for the ".dynsym" section
963 Elf_Internal_Shdr
*hdr
= elf_elfsections (abfd
)[link
];
964 if (hdr
->sh_type
!= SHT_STRTAB
)
966 asection
*s
= bfd_get_section_by_name (abfd
, ".dynsym");
967 int elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
970 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
975 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
976 for (; extdyn
< extdynend
; extdyn
++)
978 Elf_Internal_Dyn dyn
;
980 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
981 if (dyn
.d_tag
== DT_SONAME
)
983 name
= bfd_elf_string_from_elf_section (abfd
, link
,
988 if (dyn
.d_tag
== DT_NEEDED
)
990 struct bfd_link_needed_list
*n
, **pn
;
993 n
= ((struct bfd_link_needed_list
*)
994 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
995 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
997 if (n
== NULL
|| fnm
== NULL
)
999 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1006 for (pn
= &elf_hash_table (info
)->needed
;
1018 /* We do not want to include any of the sections in a dynamic
1019 object in the output file. We hack by simply clobbering the
1020 list of sections in the BFD. This could be handled more
1021 cleanly by, say, a new section flag; the existing
1022 SEC_NEVER_LOAD flag is not the one we want, because that one
1023 still implies that the section takes up space in the output
1025 abfd
->sections
= NULL
;
1026 abfd
->section_count
= 0;
1028 /* If this is the first dynamic object found in the link, create
1029 the special sections required for dynamic linking. */
1030 if (! elf_hash_table (info
)->dynamic_sections_created
)
1032 if (! elf_link_create_dynamic_sections (abfd
, info
))
1038 /* Add a DT_NEEDED entry for this dynamic object. */
1039 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1040 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1042 if (strindex
== (bfd_size_type
) -1)
1045 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1048 Elf_External_Dyn
*dyncon
, *dynconend
;
1050 /* The hash table size did not change, which means that
1051 the dynamic object name was already entered. If we
1052 have already included this dynamic object in the
1053 link, just ignore it. There is no reason to include
1054 a particular dynamic object more than once. */
1055 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1057 BFD_ASSERT (sdyn
!= NULL
);
1059 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1060 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1062 for (; dyncon
< dynconend
; dyncon
++)
1064 Elf_Internal_Dyn dyn
;
1066 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1068 if (dyn
.d_tag
== DT_NEEDED
1069 && dyn
.d_un
.d_val
== strindex
)
1073 if (extversym
!= NULL
)
1080 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1084 /* Save the SONAME, if there is one, because sometimes the
1085 linker emulation code will need to know it. */
1087 name
= bfd_get_filename (abfd
);
1088 elf_dt_name (abfd
) = name
;
1092 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1094 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1095 != extsymcount
* sizeof (Elf_External_Sym
)))
1100 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1101 esymend
= buf
+ extsymcount
;
1104 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1106 Elf_Internal_Sym sym
;
1112 struct elf_link_hash_entry
*h
;
1114 boolean size_change_ok
, type_change_ok
;
1115 boolean new_weakdef
;
1116 unsigned int old_alignment
;
1118 elf_swap_symbol_in (abfd
, esym
, &sym
);
1120 flags
= BSF_NO_FLAGS
;
1122 value
= sym
.st_value
;
1125 bind
= ELF_ST_BIND (sym
.st_info
);
1126 if (bind
== STB_LOCAL
)
1128 /* This should be impossible, since ELF requires that all
1129 global symbols follow all local symbols, and that sh_info
1130 point to the first global symbol. Unfortunatealy, Irix 5
1134 else if (bind
== STB_GLOBAL
)
1136 if (sym
.st_shndx
!= SHN_UNDEF
1137 && sym
.st_shndx
!= SHN_COMMON
)
1142 else if (bind
== STB_WEAK
)
1146 /* Leave it up to the processor backend. */
1149 if (sym
.st_shndx
== SHN_UNDEF
)
1150 sec
= bfd_und_section_ptr
;
1151 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1153 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1155 sec
= bfd_abs_section_ptr
;
1156 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1159 else if (sym
.st_shndx
== SHN_ABS
)
1160 sec
= bfd_abs_section_ptr
;
1161 else if (sym
.st_shndx
== SHN_COMMON
)
1163 sec
= bfd_com_section_ptr
;
1164 /* What ELF calls the size we call the value. What ELF
1165 calls the value we call the alignment. */
1166 value
= sym
.st_size
;
1170 /* Leave it up to the processor backend. */
1173 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1174 if (name
== (const char *) NULL
)
1177 if (add_symbol_hook
)
1179 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1183 /* The hook function sets the name to NULL if this symbol
1184 should be skipped for some reason. */
1185 if (name
== (const char *) NULL
)
1189 /* Sanity check that all possibilities were handled. */
1190 if (sec
== (asection
*) NULL
)
1192 bfd_set_error (bfd_error_bad_value
);
1196 if (bfd_is_und_section (sec
)
1197 || bfd_is_com_section (sec
))
1202 size_change_ok
= false;
1203 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1205 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1207 Elf_Internal_Versym iver
;
1208 unsigned int vernum
= 0;
1213 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1214 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1216 /* If this is a hidden symbol, or if it is not version
1217 1, we append the version name to the symbol name.
1218 However, we do not modify a non-hidden absolute
1219 symbol, because it might be the version symbol
1220 itself. FIXME: What if it isn't? */
1221 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1222 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1225 int namelen
, newlen
;
1228 if (sym
.st_shndx
!= SHN_UNDEF
)
1230 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1232 (*_bfd_error_handler
)
1233 (_("%s: %s: invalid version %u (max %d)"),
1234 bfd_get_filename (abfd
), name
, vernum
,
1235 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1236 bfd_set_error (bfd_error_bad_value
);
1239 else if (vernum
> 1)
1241 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1247 /* We cannot simply test for the number of
1248 entries in the VERNEED section since the
1249 numbers for the needed versions do not start
1251 Elf_Internal_Verneed
*t
;
1254 for (t
= elf_tdata (abfd
)->verref
;
1258 Elf_Internal_Vernaux
*a
;
1260 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1262 if (a
->vna_other
== vernum
)
1264 verstr
= a
->vna_nodename
;
1273 (*_bfd_error_handler
)
1274 (_("%s: %s: invalid needed version %d"),
1275 bfd_get_filename (abfd
), name
, vernum
);
1276 bfd_set_error (bfd_error_bad_value
);
1281 namelen
= strlen (name
);
1282 newlen
= namelen
+ strlen (verstr
) + 2;
1283 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1286 newname
= (char *) bfd_alloc (abfd
, newlen
);
1287 if (newname
== NULL
)
1289 strcpy (newname
, name
);
1290 p
= newname
+ namelen
;
1292 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1300 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1301 sym_hash
, &override
, &type_change_ok
,
1309 while (h
->root
.type
== bfd_link_hash_indirect
1310 || h
->root
.type
== bfd_link_hash_warning
)
1311 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1313 /* Remember the old alignment if this is a common symbol, so
1314 that we don't reduce the alignment later on. We can't
1315 check later, because _bfd_generic_link_add_one_symbol
1316 will set a default for the alignment which we want to
1318 if (h
->root
.type
== bfd_link_hash_common
)
1319 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1321 if (elf_tdata (abfd
)->verdef
!= NULL
1325 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1328 if (! (_bfd_generic_link_add_one_symbol
1329 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1330 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1334 while (h
->root
.type
== bfd_link_hash_indirect
1335 || h
->root
.type
== bfd_link_hash_warning
)
1336 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1339 new_weakdef
= false;
1342 && (flags
& BSF_WEAK
) != 0
1343 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1344 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1345 && h
->weakdef
== NULL
)
1347 /* Keep a list of all weak defined non function symbols from
1348 a dynamic object, using the weakdef field. Later in this
1349 function we will set the weakdef field to the correct
1350 value. We only put non-function symbols from dynamic
1351 objects on this list, because that happens to be the only
1352 time we need to know the normal symbol corresponding to a
1353 weak symbol, and the information is time consuming to
1354 figure out. If the weakdef field is not already NULL,
1355 then this symbol was already defined by some previous
1356 dynamic object, and we will be using that previous
1357 definition anyhow. */
1364 /* Set the alignment of a common symbol. */
1365 if (sym
.st_shndx
== SHN_COMMON
1366 && h
->root
.type
== bfd_link_hash_common
)
1370 align
= bfd_log2 (sym
.st_value
);
1371 if (align
> old_alignment
)
1372 h
->root
.u
.c
.p
->alignment_power
= align
;
1375 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1381 /* Remember the symbol size and type. */
1382 if (sym
.st_size
!= 0
1383 && (definition
|| h
->size
== 0))
1385 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1386 (*_bfd_error_handler
)
1387 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1388 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1389 bfd_get_filename (abfd
));
1391 h
->size
= sym
.st_size
;
1394 /* If this is a common symbol, then we always want H->SIZE
1395 to be the size of the common symbol. The code just above
1396 won't fix the size if a common symbol becomes larger. We
1397 don't warn about a size change here, because that is
1398 covered by --warn-common. */
1399 if (h
->root
.type
== bfd_link_hash_common
)
1400 h
->size
= h
->root
.u
.c
.size
;
1402 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1403 && (definition
|| h
->type
== STT_NOTYPE
))
1405 if (h
->type
!= STT_NOTYPE
1406 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1407 && ! type_change_ok
)
1408 (*_bfd_error_handler
)
1409 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1410 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1411 bfd_get_filename (abfd
));
1413 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1416 if (sym
.st_other
!= 0
1417 && (definition
|| h
->other
== 0))
1418 h
->other
= sym
.st_other
;
1420 /* Set a flag in the hash table entry indicating the type of
1421 reference or definition we just found. Keep a count of
1422 the number of dynamic symbols we find. A dynamic symbol
1423 is one which is referenced or defined by both a regular
1424 object and a shared object. */
1425 old_flags
= h
->elf_link_hash_flags
;
1431 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1432 if (bind
!= STB_WEAK
)
1433 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1436 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1438 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1439 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1445 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1447 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1448 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1449 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1450 || (h
->weakdef
!= NULL
1452 && h
->weakdef
->dynindx
!= -1))
1456 h
->elf_link_hash_flags
|= new_flag
;
1458 /* If this symbol has a version, and it is the default
1459 version, we create an indirect symbol from the default
1460 name to the fully decorated name. This will cause
1461 external references which do not specify a version to be
1462 bound to this version of the symbol. */
1467 p
= strchr (name
, ELF_VER_CHR
);
1468 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1471 struct elf_link_hash_entry
*hi
;
1474 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1476 if (shortname
== NULL
)
1478 strncpy (shortname
, name
, p
- name
);
1479 shortname
[p
- name
] = '\0';
1481 /* We are going to create a new symbol. Merge it
1482 with any existing symbol with this name. For the
1483 purposes of the merge, act as though we were
1484 defining the symbol we just defined, although we
1485 actually going to define an indirect symbol. */
1486 type_change_ok
= false;
1487 size_change_ok
= false;
1488 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1489 &value
, &hi
, &override
,
1490 &type_change_ok
, &size_change_ok
))
1495 if (! (_bfd_generic_link_add_one_symbol
1496 (info
, abfd
, shortname
, BSF_INDIRECT
,
1497 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1498 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1503 /* In this case the symbol named SHORTNAME is
1504 overriding the indirect symbol we want to
1505 add. We were planning on making SHORTNAME an
1506 indirect symbol referring to NAME. SHORTNAME
1507 is the name without a version. NAME is the
1508 fully versioned name, and it is the default
1511 Overriding means that we already saw a
1512 definition for the symbol SHORTNAME in a
1513 regular object, and it is overriding the
1514 symbol defined in the dynamic object.
1516 When this happens, we actually want to change
1517 NAME, the symbol we just added, to refer to
1518 SHORTNAME. This will cause references to
1519 NAME in the shared object to become
1520 references to SHORTNAME in the regular
1521 object. This is what we expect when we
1522 override a function in a shared object: that
1523 the references in the shared object will be
1524 mapped to the definition in the regular
1527 while (hi
->root
.type
== bfd_link_hash_indirect
1528 || hi
->root
.type
== bfd_link_hash_warning
)
1529 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1531 h
->root
.type
= bfd_link_hash_indirect
;
1532 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1533 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1535 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1536 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1537 if (hi
->elf_link_hash_flags
1538 & (ELF_LINK_HASH_REF_REGULAR
1539 | ELF_LINK_HASH_DEF_REGULAR
))
1541 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1547 /* Now set HI to H, so that the following code
1548 will set the other fields correctly. */
1552 /* If there is a duplicate definition somewhere,
1553 then HI may not point to an indirect symbol. We
1554 will have reported an error to the user in that
1557 if (hi
->root
.type
== bfd_link_hash_indirect
)
1559 struct elf_link_hash_entry
*ht
;
1561 /* If the symbol became indirect, then we assume
1562 that we have not seen a definition before. */
1563 BFD_ASSERT ((hi
->elf_link_hash_flags
1564 & (ELF_LINK_HASH_DEF_DYNAMIC
1565 | ELF_LINK_HASH_DEF_REGULAR
))
1568 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1570 /* Copy down any references that we may have
1571 already seen to the symbol which just became
1573 ht
->elf_link_hash_flags
|=
1574 (hi
->elf_link_hash_flags
1575 & (ELF_LINK_HASH_REF_DYNAMIC
1576 | ELF_LINK_HASH_REF_REGULAR
1577 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1579 /* Copy over the global and procedure linkage table
1580 offset entries. These may have been already set
1581 up by a check_relocs routine. */
1582 if (ht
->got
.offset
== (bfd_vma
) -1)
1584 ht
->got
.offset
= hi
->got
.offset
;
1585 hi
->got
.offset
= (bfd_vma
) -1;
1587 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1589 if (ht
->plt
.offset
== (bfd_vma
) -1)
1591 ht
->plt
.offset
= hi
->plt
.offset
;
1592 hi
->plt
.offset
= (bfd_vma
) -1;
1594 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1596 if (ht
->dynindx
== -1)
1598 ht
->dynindx
= hi
->dynindx
;
1599 ht
->dynstr_index
= hi
->dynstr_index
;
1601 hi
->dynstr_index
= 0;
1603 BFD_ASSERT (hi
->dynindx
== -1);
1605 /* FIXME: There may be other information to copy
1606 over for particular targets. */
1608 /* See if the new flags lead us to realize that
1609 the symbol must be dynamic. */
1615 || ((hi
->elf_link_hash_flags
1616 & ELF_LINK_HASH_REF_DYNAMIC
)
1622 if ((hi
->elf_link_hash_flags
1623 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1629 /* We also need to define an indirection from the
1630 nondefault version of the symbol. */
1632 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1634 if (shortname
== NULL
)
1636 strncpy (shortname
, name
, p
- name
);
1637 strcpy (shortname
+ (p
- name
), p
+ 1);
1639 /* Once again, merge with any existing symbol. */
1640 type_change_ok
= false;
1641 size_change_ok
= false;
1642 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1643 &value
, &hi
, &override
,
1644 &type_change_ok
, &size_change_ok
))
1649 /* Here SHORTNAME is a versioned name, so we
1650 don't expect to see the type of override we
1651 do in the case above. */
1652 (*_bfd_error_handler
)
1653 (_("%s: warning: unexpected redefinition of `%s'"),
1654 bfd_get_filename (abfd
), shortname
);
1658 if (! (_bfd_generic_link_add_one_symbol
1659 (info
, abfd
, shortname
, BSF_INDIRECT
,
1660 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1661 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1664 /* If there is a duplicate definition somewhere,
1665 then HI may not point to an indirect symbol.
1666 We will have reported an error to the user in
1669 if (hi
->root
.type
== bfd_link_hash_indirect
)
1671 /* If the symbol became indirect, then we
1672 assume that we have not seen a definition
1674 BFD_ASSERT ((hi
->elf_link_hash_flags
1675 & (ELF_LINK_HASH_DEF_DYNAMIC
1676 | ELF_LINK_HASH_DEF_REGULAR
))
1679 /* Copy down any references that we may have
1680 already seen to the symbol which just
1682 h
->elf_link_hash_flags
|=
1683 (hi
->elf_link_hash_flags
1684 & (ELF_LINK_HASH_REF_DYNAMIC
1685 | ELF_LINK_HASH_REF_REGULAR
1686 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
));
1688 /* Copy over the global and procedure linkage
1689 table offset entries. These may have been
1690 already set up by a check_relocs routine. */
1691 if (h
->got
.offset
== (bfd_vma
) -1)
1693 h
->got
.offset
= hi
->got
.offset
;
1694 hi
->got
.offset
= (bfd_vma
) -1;
1696 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1698 if (h
->plt
.offset
== (bfd_vma
) -1)
1700 h
->plt
.offset
= hi
->plt
.offset
;
1701 hi
->plt
.offset
= (bfd_vma
) -1;
1703 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1705 if (h
->dynindx
== -1)
1707 h
->dynindx
= hi
->dynindx
;
1708 h
->dynstr_index
= hi
->dynstr_index
;
1710 hi
->dynstr_index
= 0;
1712 BFD_ASSERT (hi
->dynindx
== -1);
1714 /* FIXME: There may be other information to
1715 copy over for particular targets. */
1717 /* See if the new flags lead us to realize
1718 that the symbol must be dynamic. */
1724 || ((hi
->elf_link_hash_flags
1725 & ELF_LINK_HASH_REF_DYNAMIC
)
1731 if ((hi
->elf_link_hash_flags
1732 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1741 if (dynsym
&& h
->dynindx
== -1)
1743 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1745 if (h
->weakdef
!= NULL
1747 && h
->weakdef
->dynindx
== -1)
1749 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1757 /* Now set the weakdefs field correctly for all the weak defined
1758 symbols we found. The only way to do this is to search all the
1759 symbols. Since we only need the information for non functions in
1760 dynamic objects, that's the only time we actually put anything on
1761 the list WEAKS. We need this information so that if a regular
1762 object refers to a symbol defined weakly in a dynamic object, the
1763 real symbol in the dynamic object is also put in the dynamic
1764 symbols; we also must arrange for both symbols to point to the
1765 same memory location. We could handle the general case of symbol
1766 aliasing, but a general symbol alias can only be generated in
1767 assembler code, handling it correctly would be very time
1768 consuming, and other ELF linkers don't handle general aliasing
1770 while (weaks
!= NULL
)
1772 struct elf_link_hash_entry
*hlook
;
1775 struct elf_link_hash_entry
**hpp
;
1776 struct elf_link_hash_entry
**hppend
;
1779 weaks
= hlook
->weakdef
;
1780 hlook
->weakdef
= NULL
;
1782 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1783 || hlook
->root
.type
== bfd_link_hash_defweak
1784 || hlook
->root
.type
== bfd_link_hash_common
1785 || hlook
->root
.type
== bfd_link_hash_indirect
);
1786 slook
= hlook
->root
.u
.def
.section
;
1787 vlook
= hlook
->root
.u
.def
.value
;
1789 hpp
= elf_sym_hashes (abfd
);
1790 hppend
= hpp
+ extsymcount
;
1791 for (; hpp
< hppend
; hpp
++)
1793 struct elf_link_hash_entry
*h
;
1796 if (h
!= NULL
&& h
!= hlook
1797 && h
->root
.type
== bfd_link_hash_defined
1798 && h
->root
.u
.def
.section
== slook
1799 && h
->root
.u
.def
.value
== vlook
)
1803 /* If the weak definition is in the list of dynamic
1804 symbols, make sure the real definition is put there
1806 if (hlook
->dynindx
!= -1
1807 && h
->dynindx
== -1)
1809 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1813 /* If the real definition is in the list of dynamic
1814 symbols, make sure the weak definition is put there
1815 as well. If we don't do this, then the dynamic
1816 loader might not merge the entries for the real
1817 definition and the weak definition. */
1818 if (h
->dynindx
!= -1
1819 && hlook
->dynindx
== -1)
1821 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1836 if (extversym
!= NULL
)
1842 /* If this object is the same format as the output object, and it is
1843 not a shared library, then let the backend look through the
1846 This is required to build global offset table entries and to
1847 arrange for dynamic relocs. It is not required for the
1848 particular common case of linking non PIC code, even when linking
1849 against shared libraries, but unfortunately there is no way of
1850 knowing whether an object file has been compiled PIC or not.
1851 Looking through the relocs is not particularly time consuming.
1852 The problem is that we must either (1) keep the relocs in memory,
1853 which causes the linker to require additional runtime memory or
1854 (2) read the relocs twice from the input file, which wastes time.
1855 This would be a good case for using mmap.
1857 I have no idea how to handle linking PIC code into a file of a
1858 different format. It probably can't be done. */
1859 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1861 && abfd
->xvec
== info
->hash
->creator
1862 && check_relocs
!= NULL
)
1866 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1868 Elf_Internal_Rela
*internal_relocs
;
1871 if ((o
->flags
& SEC_RELOC
) == 0
1872 || o
->reloc_count
== 0
1873 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1874 && (o
->flags
& SEC_DEBUGGING
) != 0)
1875 || bfd_is_abs_section (o
->output_section
))
1878 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1879 (abfd
, o
, (PTR
) NULL
,
1880 (Elf_Internal_Rela
*) NULL
,
1881 info
->keep_memory
));
1882 if (internal_relocs
== NULL
)
1885 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1887 if (! info
->keep_memory
)
1888 free (internal_relocs
);
1895 /* If this is a non-traditional, non-relocateable link, try to
1896 optimize the handling of the .stab/.stabstr sections. */
1898 && ! info
->relocateable
1899 && ! info
->traditional_format
1900 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1901 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1903 asection
*stab
, *stabstr
;
1905 stab
= bfd_get_section_by_name (abfd
, ".stab");
1908 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1910 if (stabstr
!= NULL
)
1912 struct bfd_elf_section_data
*secdata
;
1914 secdata
= elf_section_data (stab
);
1915 if (! _bfd_link_section_stabs (abfd
,
1916 &elf_hash_table (info
)->stab_info
,
1918 &secdata
->stab_info
))
1933 if (extversym
!= NULL
)
1938 /* Create some sections which will be filled in with dynamic linking
1939 information. ABFD is an input file which requires dynamic sections
1940 to be created. The dynamic sections take up virtual memory space
1941 when the final executable is run, so we need to create them before
1942 addresses are assigned to the output sections. We work out the
1943 actual contents and size of these sections later. */
1946 elf_link_create_dynamic_sections (abfd
, info
)
1948 struct bfd_link_info
*info
;
1951 register asection
*s
;
1952 struct elf_link_hash_entry
*h
;
1953 struct elf_backend_data
*bed
;
1955 if (elf_hash_table (info
)->dynamic_sections_created
)
1958 /* Make sure that all dynamic sections use the same input BFD. */
1959 if (elf_hash_table (info
)->dynobj
== NULL
)
1960 elf_hash_table (info
)->dynobj
= abfd
;
1962 abfd
= elf_hash_table (info
)->dynobj
;
1964 /* Note that we set the SEC_IN_MEMORY flag for all of these
1966 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1967 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1969 /* A dynamically linked executable has a .interp section, but a
1970 shared library does not. */
1973 s
= bfd_make_section (abfd
, ".interp");
1975 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1979 /* Create sections to hold version informations. These are removed
1980 if they are not needed. */
1981 s
= bfd_make_section (abfd
, ".gnu.version_d");
1983 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1984 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1987 s
= bfd_make_section (abfd
, ".gnu.version");
1989 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1990 || ! bfd_set_section_alignment (abfd
, s
, 1))
1993 s
= bfd_make_section (abfd
, ".gnu.version_r");
1995 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1996 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1999 s
= bfd_make_section (abfd
, ".dynsym");
2001 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2002 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2005 s
= bfd_make_section (abfd
, ".dynstr");
2007 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2010 /* Create a strtab to hold the dynamic symbol names. */
2011 if (elf_hash_table (info
)->dynstr
== NULL
)
2013 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
2014 if (elf_hash_table (info
)->dynstr
== NULL
)
2018 s
= bfd_make_section (abfd
, ".dynamic");
2020 || ! bfd_set_section_flags (abfd
, s
, flags
)
2021 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2024 /* The special symbol _DYNAMIC is always set to the start of the
2025 .dynamic section. This call occurs before we have processed the
2026 symbols for any dynamic object, so we don't have to worry about
2027 overriding a dynamic definition. We could set _DYNAMIC in a
2028 linker script, but we only want to define it if we are, in fact,
2029 creating a .dynamic section. We don't want to define it if there
2030 is no .dynamic section, since on some ELF platforms the start up
2031 code examines it to decide how to initialize the process. */
2033 if (! (_bfd_generic_link_add_one_symbol
2034 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2035 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2036 (struct bfd_link_hash_entry
**) &h
)))
2038 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2039 h
->type
= STT_OBJECT
;
2042 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2045 bed
= get_elf_backend_data (abfd
);
2047 s
= bfd_make_section (abfd
, ".hash");
2049 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2050 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2052 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2054 /* Let the backend create the rest of the sections. This lets the
2055 backend set the right flags. The backend will normally create
2056 the .got and .plt sections. */
2057 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2060 elf_hash_table (info
)->dynamic_sections_created
= true;
2065 /* Add an entry to the .dynamic table. */
2068 elf_add_dynamic_entry (info
, tag
, val
)
2069 struct bfd_link_info
*info
;
2073 Elf_Internal_Dyn dyn
;
2077 bfd_byte
*newcontents
;
2079 dynobj
= elf_hash_table (info
)->dynobj
;
2081 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2082 BFD_ASSERT (s
!= NULL
);
2084 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2085 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2086 if (newcontents
== NULL
)
2090 dyn
.d_un
.d_val
= val
;
2091 elf_swap_dyn_out (dynobj
, &dyn
,
2092 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2094 s
->_raw_size
= newsize
;
2095 s
->contents
= newcontents
;
2100 /* Record a new local dynamic symbol. */
2103 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2104 struct bfd_link_info
*info
;
2108 struct elf_link_local_dynamic_entry
*entry
;
2109 struct elf_link_hash_table
*eht
;
2110 struct bfd_strtab_hash
*dynstr
;
2111 Elf_External_Sym esym
;
2112 unsigned long dynstr_index
;
2115 /* See if the entry exists already. */
2116 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2117 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2120 entry
= (struct elf_link_local_dynamic_entry
*)
2121 bfd_alloc (input_bfd
, sizeof (*entry
));
2125 /* Go find the symbol, so that we can find it's name. */
2126 if (bfd_seek (input_bfd
,
2127 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2128 + input_indx
* sizeof (Elf_External_Sym
)),
2130 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2131 != sizeof (Elf_External_Sym
)))
2133 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2135 name
= (bfd_elf_string_from_elf_section
2136 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2137 entry
->isym
.st_name
));
2139 dynstr
= elf_hash_table (info
)->dynstr
;
2142 /* Create a strtab to hold the dynamic symbol names. */
2143 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2148 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2149 if (dynstr_index
== (unsigned long) -1)
2151 entry
->isym
.st_name
= dynstr_index
;
2153 eht
= elf_hash_table (info
);
2155 entry
->next
= eht
->dynlocal
;
2156 eht
->dynlocal
= entry
;
2157 entry
->input_bfd
= input_bfd
;
2158 entry
->input_indx
= input_indx
;
2161 /* Whatever binding the symbol had before, it's now local. */
2163 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2165 /* The dynindx will be set at the end of size_dynamic_sections. */
2171 /* Read and swap the relocs from the section indicated by SHDR. This
2172 may be either a REL or a RELA section. The relocations are
2173 translated into RELA relocations and stored in INTERNAL_RELOCS,
2174 which should have already been allocated to contain enough space.
2175 The EXTERNAL_RELOCS are a buffer where the external form of the
2176 relocations should be stored.
2178 Returns false if something goes wrong. */
2181 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2184 Elf_Internal_Shdr
*shdr
;
2185 PTR external_relocs
;
2186 Elf_Internal_Rela
*internal_relocs
;
2188 struct elf_backend_data
*bed
;
2190 /* If there aren't any relocations, that's OK. */
2194 /* Position ourselves at the start of the section. */
2195 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2198 /* Read the relocations. */
2199 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2203 bed
= get_elf_backend_data (abfd
);
2205 /* Convert the external relocations to the internal format. */
2206 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2208 Elf_External_Rel
*erel
;
2209 Elf_External_Rel
*erelend
;
2210 Elf_Internal_Rela
*irela
;
2211 Elf_Internal_Rel
*irel
;
2213 erel
= (Elf_External_Rel
*) external_relocs
;
2214 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2215 irela
= internal_relocs
;
2216 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2217 * sizeof (Elf_Internal_Rel
)));
2218 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2222 if (bed
->s
->swap_reloc_in
)
2223 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2225 elf_swap_reloc_in (abfd
, erel
, irel
);
2227 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2229 irela
[i
].r_offset
= irel
[i
].r_offset
;
2230 irela
[i
].r_info
= irel
[i
].r_info
;
2231 irela
[i
].r_addend
= 0;
2237 Elf_External_Rela
*erela
;
2238 Elf_External_Rela
*erelaend
;
2239 Elf_Internal_Rela
*irela
;
2241 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2243 erela
= (Elf_External_Rela
*) external_relocs
;
2244 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2245 irela
= internal_relocs
;
2246 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2248 if (bed
->s
->swap_reloca_in
)
2249 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2251 elf_swap_reloca_in (abfd
, erela
, irela
);
2258 /* Read and swap the relocs for a section O. They may have been
2259 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2260 not NULL, they are used as buffers to read into. They are known to
2261 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2262 the return value is allocated using either malloc or bfd_alloc,
2263 according to the KEEP_MEMORY argument. If O has two relocation
2264 sections (both REL and RELA relocations), then the REL_HDR
2265 relocations will appear first in INTERNAL_RELOCS, followed by the
2266 REL_HDR2 relocations. */
2269 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2273 PTR external_relocs
;
2274 Elf_Internal_Rela
*internal_relocs
;
2275 boolean keep_memory
;
2277 Elf_Internal_Shdr
*rel_hdr
;
2279 Elf_Internal_Rela
*alloc2
= NULL
;
2280 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2282 if (elf_section_data (o
)->relocs
!= NULL
)
2283 return elf_section_data (o
)->relocs
;
2285 if (o
->reloc_count
== 0)
2288 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2290 if (internal_relocs
== NULL
)
2294 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2295 * sizeof (Elf_Internal_Rela
));
2297 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2299 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2300 if (internal_relocs
== NULL
)
2304 if (external_relocs
== NULL
)
2306 size_t size
= (size_t) rel_hdr
->sh_size
;
2308 if (elf_section_data (o
)->rel_hdr2
)
2309 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2310 alloc1
= (PTR
) bfd_malloc (size
);
2313 external_relocs
= alloc1
;
2316 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2320 if (!elf_link_read_relocs_from_section
2322 elf_section_data (o
)->rel_hdr2
,
2323 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2324 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2325 * bed
->s
->int_rels_per_ext_rel
)))
2328 /* Cache the results for next time, if we can. */
2330 elf_section_data (o
)->relocs
= internal_relocs
;
2335 /* Don't free alloc2, since if it was allocated we are passing it
2336 back (under the name of internal_relocs). */
2338 return internal_relocs
;
2349 /* Record an assignment to a symbol made by a linker script. We need
2350 this in case some dynamic object refers to this symbol. */
2354 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2355 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2356 struct bfd_link_info
*info
;
2360 struct elf_link_hash_entry
*h
;
2362 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2365 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2369 if (h
->root
.type
== bfd_link_hash_new
)
2370 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2372 /* If this symbol is being provided by the linker script, and it is
2373 currently defined by a dynamic object, but not by a regular
2374 object, then mark it as undefined so that the generic linker will
2375 force the correct value. */
2377 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2378 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2379 h
->root
.type
= bfd_link_hash_undefined
;
2381 /* If this symbol is not being provided by the linker script, and it is
2382 currently defined by a dynamic object, but not by a regular object,
2383 then clear out any version information because the symbol will not be
2384 associated with the dynamic object any more. */
2386 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2387 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2388 h
->verinfo
.verdef
= NULL
;
2390 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2392 /* When possible, keep the original type of the symbol */
2393 if (h
->type
== STT_NOTYPE
)
2394 h
->type
= STT_OBJECT
;
2396 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2397 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2399 && h
->dynindx
== -1)
2401 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2404 /* If this is a weak defined symbol, and we know a corresponding
2405 real symbol from the same dynamic object, make sure the real
2406 symbol is also made into a dynamic symbol. */
2407 if (h
->weakdef
!= NULL
2408 && h
->weakdef
->dynindx
== -1)
2410 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2418 /* This structure is used to pass information to
2419 elf_link_assign_sym_version. */
2421 struct elf_assign_sym_version_info
2425 /* General link information. */
2426 struct bfd_link_info
*info
;
2428 struct bfd_elf_version_tree
*verdefs
;
2429 /* Whether we are exporting all dynamic symbols. */
2430 boolean export_dynamic
;
2431 /* Whether we had a failure. */
2435 /* This structure is used to pass information to
2436 elf_link_find_version_dependencies. */
2438 struct elf_find_verdep_info
2442 /* General link information. */
2443 struct bfd_link_info
*info
;
2444 /* The number of dependencies. */
2446 /* Whether we had a failure. */
2450 /* Array used to determine the number of hash table buckets to use
2451 based on the number of symbols there are. If there are fewer than
2452 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2453 fewer than 37 we use 17 buckets, and so forth. We never use more
2454 than 32771 buckets. */
2456 static const size_t elf_buckets
[] =
2458 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2462 /* Compute bucket count for hashing table. We do not use a static set
2463 of possible tables sizes anymore. Instead we determine for all
2464 possible reasonable sizes of the table the outcome (i.e., the
2465 number of collisions etc) and choose the best solution. The
2466 weighting functions are not too simple to allow the table to grow
2467 without bounds. Instead one of the weighting factors is the size.
2468 Therefore the result is always a good payoff between few collisions
2469 (= short chain lengths) and table size. */
2471 compute_bucket_count (info
)
2472 struct bfd_link_info
*info
;
2474 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2475 size_t best_size
= 0;
2476 unsigned long int *hashcodes
;
2477 unsigned long int *hashcodesp
;
2478 unsigned long int i
;
2480 /* Compute the hash values for all exported symbols. At the same
2481 time store the values in an array so that we could use them for
2483 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2484 * sizeof (unsigned long int));
2485 if (hashcodes
== NULL
)
2487 hashcodesp
= hashcodes
;
2489 /* Put all hash values in HASHCODES. */
2490 elf_link_hash_traverse (elf_hash_table (info
),
2491 elf_collect_hash_codes
, &hashcodesp
);
2493 /* We have a problem here. The following code to optimize the table
2494 size requires an integer type with more the 32 bits. If
2495 BFD_HOST_U_64_BIT is set we know about such a type. */
2496 #ifdef BFD_HOST_U_64_BIT
2497 if (info
->optimize
== true)
2499 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2502 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2503 unsigned long int *counts
;
2505 /* Possible optimization parameters: if we have NSYMS symbols we say
2506 that the hashing table must at least have NSYMS/4 and at most
2508 minsize
= nsyms
/ 4;
2511 best_size
= maxsize
= nsyms
* 2;
2513 /* Create array where we count the collisions in. We must use bfd_malloc
2514 since the size could be large. */
2515 counts
= (unsigned long int *) bfd_malloc (maxsize
2516 * sizeof (unsigned long int));
2523 /* Compute the "optimal" size for the hash table. The criteria is a
2524 minimal chain length. The minor criteria is (of course) the size
2526 for (i
= minsize
; i
< maxsize
; ++i
)
2528 /* Walk through the array of hashcodes and count the collisions. */
2529 BFD_HOST_U_64_BIT max
;
2530 unsigned long int j
;
2531 unsigned long int fact
;
2533 memset (counts
, '\0', i
* sizeof (unsigned long int));
2535 /* Determine how often each hash bucket is used. */
2536 for (j
= 0; j
< nsyms
; ++j
)
2537 ++counts
[hashcodes
[j
] % i
];
2539 /* For the weight function we need some information about the
2540 pagesize on the target. This is information need not be 100%
2541 accurate. Since this information is not available (so far) we
2542 define it here to a reasonable default value. If it is crucial
2543 to have a better value some day simply define this value. */
2544 # ifndef BFD_TARGET_PAGESIZE
2545 # define BFD_TARGET_PAGESIZE (4096)
2548 /* We in any case need 2 + NSYMS entries for the size values and
2550 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2553 /* Variant 1: optimize for short chains. We add the squares
2554 of all the chain lengths (which favous many small chain
2555 over a few long chains). */
2556 for (j
= 0; j
< i
; ++j
)
2557 max
+= counts
[j
] * counts
[j
];
2559 /* This adds penalties for the overall size of the table. */
2560 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2563 /* Variant 2: Optimize a lot more for small table. Here we
2564 also add squares of the size but we also add penalties for
2565 empty slots (the +1 term). */
2566 for (j
= 0; j
< i
; ++j
)
2567 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2569 /* The overall size of the table is considered, but not as
2570 strong as in variant 1, where it is squared. */
2571 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2575 /* Compare with current best results. */
2576 if (max
< best_chlen
)
2586 #endif /* defined (BFD_HOST_U_64_BIT) */
2588 /* This is the fallback solution if no 64bit type is available or if we
2589 are not supposed to spend much time on optimizations. We select the
2590 bucket count using a fixed set of numbers. */
2591 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2593 best_size
= elf_buckets
[i
];
2594 if (dynsymcount
< elf_buckets
[i
+ 1])
2599 /* Free the arrays we needed. */
2605 /* Set up the sizes and contents of the ELF dynamic sections. This is
2606 called by the ELF linker emulation before_allocation routine. We
2607 must set the sizes of the sections before the linker sets the
2608 addresses of the various sections. */
2611 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2612 export_dynamic
, filter_shlib
,
2613 auxiliary_filters
, info
, sinterpptr
,
2618 boolean export_dynamic
;
2619 const char *filter_shlib
;
2620 const char * const *auxiliary_filters
;
2621 struct bfd_link_info
*info
;
2622 asection
**sinterpptr
;
2623 struct bfd_elf_version_tree
*verdefs
;
2625 bfd_size_type soname_indx
;
2627 struct elf_backend_data
*bed
;
2628 struct elf_assign_sym_version_info asvinfo
;
2632 soname_indx
= (bfd_size_type
) -1;
2634 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2637 /* The backend may have to create some sections regardless of whether
2638 we're dynamic or not. */
2639 bed
= get_elf_backend_data (output_bfd
);
2640 if (bed
->elf_backend_always_size_sections
2641 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2644 dynobj
= elf_hash_table (info
)->dynobj
;
2646 /* If there were no dynamic objects in the link, there is nothing to
2651 /* If we are supposed to export all symbols into the dynamic symbol
2652 table (this is not the normal case), then do so. */
2655 struct elf_info_failed eif
;
2659 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2665 if (elf_hash_table (info
)->dynamic_sections_created
)
2667 struct elf_info_failed eif
;
2668 struct elf_link_hash_entry
*h
;
2669 bfd_size_type strsize
;
2671 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2672 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2676 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2677 soname
, true, true);
2678 if (soname_indx
== (bfd_size_type
) -1
2679 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2685 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2693 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2695 if (indx
== (bfd_size_type
) -1
2696 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2700 if (filter_shlib
!= NULL
)
2704 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2705 filter_shlib
, true, true);
2706 if (indx
== (bfd_size_type
) -1
2707 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2711 if (auxiliary_filters
!= NULL
)
2713 const char * const *p
;
2715 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2719 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2721 if (indx
== (bfd_size_type
) -1
2722 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2727 /* Attach all the symbols to their version information. */
2728 asvinfo
.output_bfd
= output_bfd
;
2729 asvinfo
.info
= info
;
2730 asvinfo
.verdefs
= verdefs
;
2731 asvinfo
.export_dynamic
= export_dynamic
;
2732 asvinfo
.failed
= false;
2734 elf_link_hash_traverse (elf_hash_table (info
),
2735 elf_link_assign_sym_version
,
2740 /* Find all symbols which were defined in a dynamic object and make
2741 the backend pick a reasonable value for them. */
2744 elf_link_hash_traverse (elf_hash_table (info
),
2745 elf_adjust_dynamic_symbol
,
2750 /* Add some entries to the .dynamic section. We fill in some of the
2751 values later, in elf_bfd_final_link, but we must add the entries
2752 now so that we know the final size of the .dynamic section. */
2754 /* If there are initialization and/or finalization functions to
2755 call then add the corresponding DT_INIT/DT_FINI entries. */
2756 h
= (info
->init_function
2757 ? elf_link_hash_lookup (elf_hash_table (info
),
2758 info
->init_function
, false,
2762 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2763 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2765 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2768 h
= (info
->fini_function
2769 ? elf_link_hash_lookup (elf_hash_table (info
),
2770 info
->fini_function
, false,
2774 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2775 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2777 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2781 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2782 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2783 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2784 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2785 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2786 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2787 sizeof (Elf_External_Sym
)))
2791 /* The backend must work out the sizes of all the other dynamic
2793 if (bed
->elf_backend_size_dynamic_sections
2794 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2797 if (elf_hash_table (info
)->dynamic_sections_created
)
2801 size_t bucketcount
= 0;
2802 Elf_Internal_Sym isym
;
2803 size_t hash_entry_size
;
2805 /* Set up the version definition section. */
2806 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2807 BFD_ASSERT (s
!= NULL
);
2809 /* We may have created additional version definitions if we are
2810 just linking a regular application. */
2811 verdefs
= asvinfo
.verdefs
;
2813 if (verdefs
== NULL
)
2814 _bfd_strip_section_from_output (s
);
2819 struct bfd_elf_version_tree
*t
;
2821 Elf_Internal_Verdef def
;
2822 Elf_Internal_Verdaux defaux
;
2827 /* Make space for the base version. */
2828 size
+= sizeof (Elf_External_Verdef
);
2829 size
+= sizeof (Elf_External_Verdaux
);
2832 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2834 struct bfd_elf_version_deps
*n
;
2836 size
+= sizeof (Elf_External_Verdef
);
2837 size
+= sizeof (Elf_External_Verdaux
);
2840 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2841 size
+= sizeof (Elf_External_Verdaux
);
2844 s
->_raw_size
= size
;
2845 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2846 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2849 /* Fill in the version definition section. */
2853 def
.vd_version
= VER_DEF_CURRENT
;
2854 def
.vd_flags
= VER_FLG_BASE
;
2857 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2858 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2859 + sizeof (Elf_External_Verdaux
));
2861 if (soname_indx
!= (bfd_size_type
) -1)
2863 def
.vd_hash
= bfd_elf_hash (soname
);
2864 defaux
.vda_name
= soname_indx
;
2871 name
= output_bfd
->filename
;
2872 def
.vd_hash
= bfd_elf_hash (name
);
2873 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2875 if (indx
== (bfd_size_type
) -1)
2877 defaux
.vda_name
= indx
;
2879 defaux
.vda_next
= 0;
2881 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2882 (Elf_External_Verdef
*)p
);
2883 p
+= sizeof (Elf_External_Verdef
);
2884 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2885 (Elf_External_Verdaux
*) p
);
2886 p
+= sizeof (Elf_External_Verdaux
);
2888 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2891 struct bfd_elf_version_deps
*n
;
2892 struct elf_link_hash_entry
*h
;
2895 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2898 /* Add a symbol representing this version. */
2900 if (! (_bfd_generic_link_add_one_symbol
2901 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2902 (bfd_vma
) 0, (const char *) NULL
, false,
2903 get_elf_backend_data (dynobj
)->collect
,
2904 (struct bfd_link_hash_entry
**) &h
)))
2906 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2907 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2908 h
->type
= STT_OBJECT
;
2909 h
->verinfo
.vertree
= t
;
2911 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2914 def
.vd_version
= VER_DEF_CURRENT
;
2916 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2917 def
.vd_flags
|= VER_FLG_WEAK
;
2918 def
.vd_ndx
= t
->vernum
+ 1;
2919 def
.vd_cnt
= cdeps
+ 1;
2920 def
.vd_hash
= bfd_elf_hash (t
->name
);
2921 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2922 if (t
->next
!= NULL
)
2923 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2924 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2928 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2929 (Elf_External_Verdef
*) p
);
2930 p
+= sizeof (Elf_External_Verdef
);
2932 defaux
.vda_name
= h
->dynstr_index
;
2933 if (t
->deps
== NULL
)
2934 defaux
.vda_next
= 0;
2936 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2937 t
->name_indx
= defaux
.vda_name
;
2939 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2940 (Elf_External_Verdaux
*) p
);
2941 p
+= sizeof (Elf_External_Verdaux
);
2943 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2945 if (n
->version_needed
== NULL
)
2947 /* This can happen if there was an error in the
2949 defaux
.vda_name
= 0;
2952 defaux
.vda_name
= n
->version_needed
->name_indx
;
2953 if (n
->next
== NULL
)
2954 defaux
.vda_next
= 0;
2956 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2958 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2959 (Elf_External_Verdaux
*) p
);
2960 p
+= sizeof (Elf_External_Verdaux
);
2964 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2965 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2968 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2971 /* Work out the size of the version reference section. */
2973 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2974 BFD_ASSERT (s
!= NULL
);
2976 struct elf_find_verdep_info sinfo
;
2978 sinfo
.output_bfd
= output_bfd
;
2980 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2981 if (sinfo
.vers
== 0)
2983 sinfo
.failed
= false;
2985 elf_link_hash_traverse (elf_hash_table (info
),
2986 elf_link_find_version_dependencies
,
2989 if (elf_tdata (output_bfd
)->verref
== NULL
)
2990 _bfd_strip_section_from_output (s
);
2993 Elf_Internal_Verneed
*t
;
2998 /* Build the version definition section. */
3001 for (t
= elf_tdata (output_bfd
)->verref
;
3005 Elf_Internal_Vernaux
*a
;
3007 size
+= sizeof (Elf_External_Verneed
);
3009 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3010 size
+= sizeof (Elf_External_Vernaux
);
3013 s
->_raw_size
= size
;
3014 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
3015 if (s
->contents
== NULL
)
3019 for (t
= elf_tdata (output_bfd
)->verref
;
3024 Elf_Internal_Vernaux
*a
;
3028 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3031 t
->vn_version
= VER_NEED_CURRENT
;
3033 if (elf_dt_name (t
->vn_bfd
) != NULL
)
3034 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3035 elf_dt_name (t
->vn_bfd
),
3038 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3039 t
->vn_bfd
->filename
, true, false);
3040 if (indx
== (bfd_size_type
) -1)
3043 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3044 if (t
->vn_nextref
== NULL
)
3047 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3048 + caux
* sizeof (Elf_External_Vernaux
));
3050 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3051 (Elf_External_Verneed
*) p
);
3052 p
+= sizeof (Elf_External_Verneed
);
3054 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3056 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3057 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3058 a
->vna_nodename
, true, false);
3059 if (indx
== (bfd_size_type
) -1)
3062 if (a
->vna_nextptr
== NULL
)
3065 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3067 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3068 (Elf_External_Vernaux
*) p
);
3069 p
+= sizeof (Elf_External_Vernaux
);
3073 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3074 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3077 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3081 /* Assign dynsym indicies. In a shared library we generate a
3082 section symbol for each output section, which come first.
3083 Next come all of the back-end allocated local dynamic syms,
3084 followed by the rest of the global symbols. */
3086 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3088 /* Work out the size of the symbol version section. */
3089 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3090 BFD_ASSERT (s
!= NULL
);
3091 if (dynsymcount
== 0
3092 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3094 _bfd_strip_section_from_output (s
);
3095 /* The DYNSYMCOUNT might have changed if we were going to
3096 output a dynamic symbol table entry for S. */
3097 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3101 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3102 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3103 if (s
->contents
== NULL
)
3106 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3110 /* Set the size of the .dynsym and .hash sections. We counted
3111 the number of dynamic symbols in elf_link_add_object_symbols.
3112 We will build the contents of .dynsym and .hash when we build
3113 the final symbol table, because until then we do not know the
3114 correct value to give the symbols. We built the .dynstr
3115 section as we went along in elf_link_add_object_symbols. */
3116 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3117 BFD_ASSERT (s
!= NULL
);
3118 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3119 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3120 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3123 /* The first entry in .dynsym is a dummy symbol. */
3130 elf_swap_symbol_out (output_bfd
, &isym
,
3131 (PTR
) (Elf_External_Sym
*) s
->contents
);
3133 /* Compute the size of the hashing table. As a side effect this
3134 computes the hash values for all the names we export. */
3135 bucketcount
= compute_bucket_count (info
);
3137 s
= bfd_get_section_by_name (dynobj
, ".hash");
3138 BFD_ASSERT (s
!= NULL
);
3139 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3140 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3141 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3142 if (s
->contents
== NULL
)
3144 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3146 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3147 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3148 s
->contents
+ hash_entry_size
);
3150 elf_hash_table (info
)->bucketcount
= bucketcount
;
3152 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3153 BFD_ASSERT (s
!= NULL
);
3154 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3156 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3163 /* Fix up the flags for a symbol. This handles various cases which
3164 can only be fixed after all the input files are seen. This is
3165 currently called by both adjust_dynamic_symbol and
3166 assign_sym_version, which is unnecessary but perhaps more robust in
3167 the face of future changes. */
3170 elf_fix_symbol_flags (h
, eif
)
3171 struct elf_link_hash_entry
*h
;
3172 struct elf_info_failed
*eif
;
3174 /* If this symbol was mentioned in a non-ELF file, try to set
3175 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3176 permit a non-ELF file to correctly refer to a symbol defined in
3177 an ELF dynamic object. */
3178 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3180 if (h
->root
.type
!= bfd_link_hash_defined
3181 && h
->root
.type
!= bfd_link_hash_defweak
)
3182 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3183 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3186 if (h
->root
.u
.def
.section
->owner
!= NULL
3187 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3188 == bfd_target_elf_flavour
))
3189 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3190 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3192 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3195 if (h
->dynindx
== -1
3196 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3197 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3199 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3208 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3209 was first seen in a non-ELF file. Fortunately, if the symbol
3210 was first seen in an ELF file, we're probably OK unless the
3211 symbol was defined in a non-ELF file. Catch that case here.
3212 FIXME: We're still in trouble if the symbol was first seen in
3213 a dynamic object, and then later in a non-ELF regular object. */
3214 if ((h
->root
.type
== bfd_link_hash_defined
3215 || h
->root
.type
== bfd_link_hash_defweak
)
3216 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3217 && (h
->root
.u
.def
.section
->owner
!= NULL
3218 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3219 != bfd_target_elf_flavour
)
3220 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3221 && (h
->elf_link_hash_flags
3222 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3223 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3226 /* If this is a final link, and the symbol was defined as a common
3227 symbol in a regular object file, and there was no definition in
3228 any dynamic object, then the linker will have allocated space for
3229 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3230 flag will not have been set. */
3231 if (h
->root
.type
== bfd_link_hash_defined
3232 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3233 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3234 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3235 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3236 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3238 /* If -Bsymbolic was used (which means to bind references to global
3239 symbols to the definition within the shared object), and this
3240 symbol was defined in a regular object, then it actually doesn't
3241 need a PLT entry. */
3242 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3243 && eif
->info
->shared
3244 && eif
->info
->symbolic
3245 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3247 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3248 h
->plt
.offset
= (bfd_vma
) -1;
3254 /* Make the backend pick a good value for a dynamic symbol. This is
3255 called via elf_link_hash_traverse, and also calls itself
3259 elf_adjust_dynamic_symbol (h
, data
)
3260 struct elf_link_hash_entry
*h
;
3263 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3265 struct elf_backend_data
*bed
;
3267 /* Ignore indirect symbols. These are added by the versioning code. */
3268 if (h
->root
.type
== bfd_link_hash_indirect
)
3271 /* Fix the symbol flags. */
3272 if (! elf_fix_symbol_flags (h
, eif
))
3275 /* If this symbol does not require a PLT entry, and it is not
3276 defined by a dynamic object, or is not referenced by a regular
3277 object, ignore it. We do have to handle a weak defined symbol,
3278 even if no regular object refers to it, if we decided to add it
3279 to the dynamic symbol table. FIXME: Do we normally need to worry
3280 about symbols which are defined by one dynamic object and
3281 referenced by another one? */
3282 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3283 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3284 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3285 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3286 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3288 h
->plt
.offset
= (bfd_vma
) -1;
3292 /* If we've already adjusted this symbol, don't do it again. This
3293 can happen via a recursive call. */
3294 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3297 /* Don't look at this symbol again. Note that we must set this
3298 after checking the above conditions, because we may look at a
3299 symbol once, decide not to do anything, and then get called
3300 recursively later after REF_REGULAR is set below. */
3301 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3303 /* If this is a weak definition, and we know a real definition, and
3304 the real symbol is not itself defined by a regular object file,
3305 then get a good value for the real definition. We handle the
3306 real symbol first, for the convenience of the backend routine.
3308 Note that there is a confusing case here. If the real definition
3309 is defined by a regular object file, we don't get the real symbol
3310 from the dynamic object, but we do get the weak symbol. If the
3311 processor backend uses a COPY reloc, then if some routine in the
3312 dynamic object changes the real symbol, we will not see that
3313 change in the corresponding weak symbol. This is the way other
3314 ELF linkers work as well, and seems to be a result of the shared
3317 I will clarify this issue. Most SVR4 shared libraries define the
3318 variable _timezone and define timezone as a weak synonym. The
3319 tzset call changes _timezone. If you write
3320 extern int timezone;
3322 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3323 you might expect that, since timezone is a synonym for _timezone,
3324 the same number will print both times. However, if the processor
3325 backend uses a COPY reloc, then actually timezone will be copied
3326 into your process image, and, since you define _timezone
3327 yourself, _timezone will not. Thus timezone and _timezone will
3328 wind up at different memory locations. The tzset call will set
3329 _timezone, leaving timezone unchanged. */
3331 if (h
->weakdef
!= NULL
)
3333 struct elf_link_hash_entry
*weakdef
;
3335 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3336 || h
->root
.type
== bfd_link_hash_defweak
);
3337 weakdef
= h
->weakdef
;
3338 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3339 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3340 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3341 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3343 /* This symbol is defined by a regular object file, so we
3344 will not do anything special. Clear weakdef for the
3345 convenience of the processor backend. */
3350 /* There is an implicit reference by a regular object file
3351 via the weak symbol. */
3352 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3353 if (h
->weakdef
->elf_link_hash_flags
3354 & ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3355 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
3356 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
3361 /* If a symbol has no type and no size and does not require a PLT
3362 entry, then we are probably about to do the wrong thing here: we
3363 are probably going to create a COPY reloc for an empty object.
3364 This case can arise when a shared object is built with assembly
3365 code, and the assembly code fails to set the symbol type. */
3367 && h
->type
== STT_NOTYPE
3368 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3369 (*_bfd_error_handler
)
3370 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3371 h
->root
.root
.string
);
3373 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3374 bed
= get_elf_backend_data (dynobj
);
3375 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3384 /* This routine is used to export all defined symbols into the dynamic
3385 symbol table. It is called via elf_link_hash_traverse. */
3388 elf_export_symbol (h
, data
)
3389 struct elf_link_hash_entry
*h
;
3392 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3394 /* Ignore indirect symbols. These are added by the versioning code. */
3395 if (h
->root
.type
== bfd_link_hash_indirect
)
3398 if (h
->dynindx
== -1
3399 && (h
->elf_link_hash_flags
3400 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3402 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3412 /* Look through the symbols which are defined in other shared
3413 libraries and referenced here. Update the list of version
3414 dependencies. This will be put into the .gnu.version_r section.
3415 This function is called via elf_link_hash_traverse. */
3418 elf_link_find_version_dependencies (h
, data
)
3419 struct elf_link_hash_entry
*h
;
3422 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3423 Elf_Internal_Verneed
*t
;
3424 Elf_Internal_Vernaux
*a
;
3426 /* We only care about symbols defined in shared objects with version
3428 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3429 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3431 || h
->verinfo
.verdef
== NULL
)
3434 /* See if we already know about this version. */
3435 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3437 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3440 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3441 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3447 /* This is a new version. Add it to tree we are building. */
3451 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3454 rinfo
->failed
= true;
3458 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3459 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3460 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3463 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3465 /* Note that we are copying a string pointer here, and testing it
3466 above. If bfd_elf_string_from_elf_section is ever changed to
3467 discard the string data when low in memory, this will have to be
3469 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3471 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3472 a
->vna_nextptr
= t
->vn_auxptr
;
3474 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3477 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3484 /* Figure out appropriate versions for all the symbols. We may not
3485 have the version number script until we have read all of the input
3486 files, so until that point we don't know which symbols should be
3487 local. This function is called via elf_link_hash_traverse. */
3490 elf_link_assign_sym_version (h
, data
)
3491 struct elf_link_hash_entry
*h
;
3494 struct elf_assign_sym_version_info
*sinfo
=
3495 (struct elf_assign_sym_version_info
*) data
;
3496 struct bfd_link_info
*info
= sinfo
->info
;
3497 struct elf_info_failed eif
;
3500 /* Fix the symbol flags. */
3503 if (! elf_fix_symbol_flags (h
, &eif
))
3506 sinfo
->failed
= true;
3510 /* We only need version numbers for symbols defined in regular
3512 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3515 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3516 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3518 struct bfd_elf_version_tree
*t
;
3523 /* There are two consecutive ELF_VER_CHR characters if this is
3524 not a hidden symbol. */
3526 if (*p
== ELF_VER_CHR
)
3532 /* If there is no version string, we can just return out. */
3536 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3540 /* Look for the version. If we find it, it is no longer weak. */
3541 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3543 if (strcmp (t
->name
, p
) == 0)
3547 struct bfd_elf_version_expr
*d
;
3549 len
= p
- h
->root
.root
.string
;
3550 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3553 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3554 alc
[len
- 1] = '\0';
3555 if (alc
[len
- 2] == ELF_VER_CHR
)
3556 alc
[len
- 2] = '\0';
3558 h
->verinfo
.vertree
= t
;
3562 if (t
->globals
!= NULL
)
3564 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3565 if ((*d
->match
) (d
, alc
))
3569 /* See if there is anything to force this symbol to
3571 if (d
== NULL
&& t
->locals
!= NULL
)
3573 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3575 if ((*d
->match
) (d
, alc
))
3577 if (h
->dynindx
!= -1
3579 && ! sinfo
->export_dynamic
)
3581 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3582 h
->elf_link_hash_flags
&=~
3583 ELF_LINK_HASH_NEEDS_PLT
;
3585 h
->plt
.offset
= (bfd_vma
) -1;
3586 /* FIXME: The name of the symbol has
3587 already been recorded in the dynamic
3588 string table section. */
3596 bfd_release (sinfo
->output_bfd
, alc
);
3601 /* If we are building an application, we need to create a
3602 version node for this version. */
3603 if (t
== NULL
&& ! info
->shared
)
3605 struct bfd_elf_version_tree
**pp
;
3608 /* If we aren't going to export this symbol, we don't need
3609 to worry about it. */
3610 if (h
->dynindx
== -1)
3613 t
= ((struct bfd_elf_version_tree
*)
3614 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3617 sinfo
->failed
= true;
3626 t
->name_indx
= (unsigned int) -1;
3630 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3632 t
->vernum
= version_index
;
3636 h
->verinfo
.vertree
= t
;
3640 /* We could not find the version for a symbol when
3641 generating a shared archive. Return an error. */
3642 (*_bfd_error_handler
)
3643 (_("%s: undefined versioned symbol name %s"),
3644 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3645 bfd_set_error (bfd_error_bad_value
);
3646 sinfo
->failed
= true;
3651 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3654 /* If we don't have a version for this symbol, see if we can find
3656 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3658 struct bfd_elf_version_tree
*t
;
3659 struct bfd_elf_version_tree
*deflt
;
3660 struct bfd_elf_version_expr
*d
;
3662 /* See if can find what version this symbol is in. If the
3663 symbol is supposed to be local, then don't actually register
3666 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3668 if (t
->globals
!= NULL
)
3670 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3672 if ((*d
->match
) (d
, h
->root
.root
.string
))
3674 h
->verinfo
.vertree
= t
;
3683 if (t
->locals
!= NULL
)
3685 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3687 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3689 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3691 h
->verinfo
.vertree
= t
;
3692 if (h
->dynindx
!= -1
3694 && ! sinfo
->export_dynamic
)
3696 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3697 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3699 h
->plt
.offset
= (bfd_vma
) -1;
3700 /* FIXME: The name of the symbol has already
3701 been recorded in the dynamic string table
3713 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3715 h
->verinfo
.vertree
= deflt
;
3716 if (h
->dynindx
!= -1
3718 && ! sinfo
->export_dynamic
)
3720 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3721 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3723 h
->plt
.offset
= (bfd_vma
) -1;
3724 /* FIXME: The name of the symbol has already been
3725 recorded in the dynamic string table section. */
3733 /* Final phase of ELF linker. */
3735 /* A structure we use to avoid passing large numbers of arguments. */
3737 struct elf_final_link_info
3739 /* General link information. */
3740 struct bfd_link_info
*info
;
3743 /* Symbol string table. */
3744 struct bfd_strtab_hash
*symstrtab
;
3745 /* .dynsym section. */
3746 asection
*dynsym_sec
;
3747 /* .hash section. */
3749 /* symbol version section (.gnu.version). */
3750 asection
*symver_sec
;
3751 /* Buffer large enough to hold contents of any section. */
3753 /* Buffer large enough to hold external relocs of any section. */
3754 PTR external_relocs
;
3755 /* Buffer large enough to hold internal relocs of any section. */
3756 Elf_Internal_Rela
*internal_relocs
;
3757 /* Buffer large enough to hold external local symbols of any input
3759 Elf_External_Sym
*external_syms
;
3760 /* Buffer large enough to hold internal local symbols of any input
3762 Elf_Internal_Sym
*internal_syms
;
3763 /* Array large enough to hold a symbol index for each local symbol
3764 of any input BFD. */
3766 /* Array large enough to hold a section pointer for each local
3767 symbol of any input BFD. */
3768 asection
**sections
;
3769 /* Buffer to hold swapped out symbols. */
3770 Elf_External_Sym
*symbuf
;
3771 /* Number of swapped out symbols in buffer. */
3772 size_t symbuf_count
;
3773 /* Number of symbols which fit in symbuf. */
3777 static boolean elf_link_output_sym
3778 PARAMS ((struct elf_final_link_info
*, const char *,
3779 Elf_Internal_Sym
*, asection
*));
3780 static boolean elf_link_flush_output_syms
3781 PARAMS ((struct elf_final_link_info
*));
3782 static boolean elf_link_output_extsym
3783 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3784 static boolean elf_link_input_bfd
3785 PARAMS ((struct elf_final_link_info
*, bfd
*));
3786 static boolean elf_reloc_link_order
3787 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3788 struct bfd_link_order
*));
3790 /* This struct is used to pass information to elf_link_output_extsym. */
3792 struct elf_outext_info
3796 struct elf_final_link_info
*finfo
;
3799 /* Compute the size of, and allocate space for, REL_HDR which is the
3800 section header for a section containing relocations for O. */
3803 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
3805 Elf_Internal_Shdr
*rel_hdr
;
3808 register struct elf_link_hash_entry
**p
, **pend
;
3809 unsigned reloc_count
;
3811 /* Figure out how many relocations there will be. */
3812 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
3813 reloc_count
= elf_section_data (o
)->rel_count
;
3815 reloc_count
= elf_section_data (o
)->rel_count2
;
3817 /* That allows us to calculate the size of the section. */
3818 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
3820 /* The contents field must last into write_object_contents, so we
3821 allocate it with bfd_alloc rather than malloc. */
3822 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3823 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3826 /* We only allocate one set of hash entries, so we only do it the
3827 first time we are called. */
3828 if (elf_section_data (o
)->rel_hashes
== NULL
)
3830 p
= ((struct elf_link_hash_entry
**)
3831 bfd_malloc (o
->reloc_count
3832 * sizeof (struct elf_link_hash_entry
*)));
3833 if (p
== NULL
&& o
->reloc_count
!= 0)
3836 elf_section_data (o
)->rel_hashes
= p
;
3837 pend
= p
+ o
->reloc_count
;
3838 for (; p
< pend
; p
++)
3845 /* When performing a relocateable link, the input relocations are
3846 preserved. But, if they reference global symbols, the indices
3847 referenced must be updated. Update all the relocations in
3848 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
3851 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
3853 Elf_Internal_Shdr
*rel_hdr
;
3855 struct elf_link_hash_entry
**rel_hash
;
3859 for (i
= 0; i
< count
; i
++, rel_hash
++)
3861 if (*rel_hash
== NULL
)
3864 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3866 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3868 Elf_External_Rel
*erel
;
3869 Elf_Internal_Rel irel
;
3871 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3872 elf_swap_reloc_in (abfd
, erel
, &irel
);
3873 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3874 ELF_R_TYPE (irel
.r_info
));
3875 elf_swap_reloc_out (abfd
, &irel
, erel
);
3879 Elf_External_Rela
*erela
;
3880 Elf_Internal_Rela irela
;
3882 BFD_ASSERT (rel_hdr
->sh_entsize
3883 == sizeof (Elf_External_Rela
));
3885 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3886 elf_swap_reloca_in (abfd
, erela
, &irela
);
3887 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3888 ELF_R_TYPE (irela
.r_info
));
3889 elf_swap_reloca_out (abfd
, &irela
, erela
);
3894 /* Do the final step of an ELF link. */
3897 elf_bfd_final_link (abfd
, info
)
3899 struct bfd_link_info
*info
;
3903 struct elf_final_link_info finfo
;
3904 register asection
*o
;
3905 register struct bfd_link_order
*p
;
3907 size_t max_contents_size
;
3908 size_t max_external_reloc_size
;
3909 size_t max_internal_reloc_count
;
3910 size_t max_sym_count
;
3912 Elf_Internal_Sym elfsym
;
3914 Elf_Internal_Shdr
*symtab_hdr
;
3915 Elf_Internal_Shdr
*symstrtab_hdr
;
3916 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3917 struct elf_outext_info eoinfo
;
3920 abfd
->flags
|= DYNAMIC
;
3922 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3923 dynobj
= elf_hash_table (info
)->dynobj
;
3926 finfo
.output_bfd
= abfd
;
3927 finfo
.symstrtab
= elf_stringtab_init ();
3928 if (finfo
.symstrtab
== NULL
)
3933 finfo
.dynsym_sec
= NULL
;
3934 finfo
.hash_sec
= NULL
;
3935 finfo
.symver_sec
= NULL
;
3939 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3940 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3941 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3942 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3943 /* Note that it is OK if symver_sec is NULL. */
3946 finfo
.contents
= NULL
;
3947 finfo
.external_relocs
= NULL
;
3948 finfo
.internal_relocs
= NULL
;
3949 finfo
.external_syms
= NULL
;
3950 finfo
.internal_syms
= NULL
;
3951 finfo
.indices
= NULL
;
3952 finfo
.sections
= NULL
;
3953 finfo
.symbuf
= NULL
;
3954 finfo
.symbuf_count
= 0;
3956 /* Count up the number of relocations we will output for each output
3957 section, so that we know the sizes of the reloc sections. We
3958 also figure out some maximum sizes. */
3959 max_contents_size
= 0;
3960 max_external_reloc_size
= 0;
3961 max_internal_reloc_count
= 0;
3963 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3967 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3969 if (p
->type
== bfd_section_reloc_link_order
3970 || p
->type
== bfd_symbol_reloc_link_order
)
3972 else if (p
->type
== bfd_indirect_link_order
)
3976 sec
= p
->u
.indirect
.section
;
3978 /* Mark all sections which are to be included in the
3979 link. This will normally be every section. We need
3980 to do this so that we can identify any sections which
3981 the linker has decided to not include. */
3982 sec
->linker_mark
= true;
3984 if (info
->relocateable
)
3985 o
->reloc_count
+= sec
->reloc_count
;
3987 if (sec
->_raw_size
> max_contents_size
)
3988 max_contents_size
= sec
->_raw_size
;
3989 if (sec
->_cooked_size
> max_contents_size
)
3990 max_contents_size
= sec
->_cooked_size
;
3992 /* We are interested in just local symbols, not all
3994 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3995 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3999 if (elf_bad_symtab (sec
->owner
))
4000 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4001 / sizeof (Elf_External_Sym
));
4003 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4005 if (sym_count
> max_sym_count
)
4006 max_sym_count
= sym_count
;
4008 if ((sec
->flags
& SEC_RELOC
) != 0)
4012 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4013 if (ext_size
> max_external_reloc_size
)
4014 max_external_reloc_size
= ext_size
;
4015 if (sec
->reloc_count
> max_internal_reloc_count
)
4016 max_internal_reloc_count
= sec
->reloc_count
;
4022 if (o
->reloc_count
> 0)
4023 o
->flags
|= SEC_RELOC
;
4026 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4027 set it (this is probably a bug) and if it is set
4028 assign_section_numbers will create a reloc section. */
4029 o
->flags
&=~ SEC_RELOC
;
4032 /* If the SEC_ALLOC flag is not set, force the section VMA to
4033 zero. This is done in elf_fake_sections as well, but forcing
4034 the VMA to 0 here will ensure that relocs against these
4035 sections are handled correctly. */
4036 if ((o
->flags
& SEC_ALLOC
) == 0
4037 && ! o
->user_set_vma
)
4041 /* Figure out the file positions for everything but the symbol table
4042 and the relocs. We set symcount to force assign_section_numbers
4043 to create a symbol table. */
4044 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4045 BFD_ASSERT (! abfd
->output_has_begun
);
4046 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4049 /* Figure out how many relocations we will have in each section.
4050 Just using RELOC_COUNT isn't good enough since that doesn't
4051 maintain a separate value for REL vs. RELA relocations. */
4052 if (info
->relocateable
)
4053 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4054 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4056 asection
* output_section
= o
->output_section
;
4058 if (output_section
&& (o
->flags
& SEC_RELOC
) != 0)
4060 struct bfd_elf_section_data
*esdi
4061 = elf_section_data (o
);
4062 struct bfd_elf_section_data
*esdo
4063 = elf_section_data (output_section
);
4064 unsigned int *rel_count
;
4065 unsigned int *rel_count2
;
4067 /* We must be careful to add the relocation froms the
4068 input section to the right output count. */
4069 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
4071 rel_count
= &esdo
->rel_count
;
4072 rel_count2
= &esdo
->rel_count2
;
4076 rel_count
= &esdo
->rel_count2
;
4077 rel_count2
= &esdo
->rel_count
;
4080 *rel_count
+= (esdi
->rel_hdr
.sh_size
4081 / esdi
->rel_hdr
.sh_entsize
);
4083 *rel_count2
+= (esdi
->rel_hdr2
->sh_size
4084 / esdi
->rel_hdr2
->sh_entsize
);
4088 /* That created the reloc sections. Set their sizes, and assign
4089 them file positions, and allocate some buffers. */
4090 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4092 if ((o
->flags
& SEC_RELOC
) != 0)
4094 if (!elf_link_size_reloc_section (abfd
,
4095 &elf_section_data (o
)->rel_hdr
,
4099 if (elf_section_data (o
)->rel_hdr2
4100 && !elf_link_size_reloc_section (abfd
,
4101 elf_section_data (o
)->rel_hdr2
,
4106 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4107 to count upwards while actually outputting the relocations. */
4108 elf_section_data (o
)->rel_count
= 0;
4109 elf_section_data (o
)->rel_count2
= 0;
4112 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4114 /* We have now assigned file positions for all the sections except
4115 .symtab and .strtab. We start the .symtab section at the current
4116 file position, and write directly to it. We build the .strtab
4117 section in memory. */
4118 bfd_get_symcount (abfd
) = 0;
4119 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4120 /* sh_name is set in prep_headers. */
4121 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4122 symtab_hdr
->sh_flags
= 0;
4123 symtab_hdr
->sh_addr
= 0;
4124 symtab_hdr
->sh_size
= 0;
4125 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4126 /* sh_link is set in assign_section_numbers. */
4127 /* sh_info is set below. */
4128 /* sh_offset is set just below. */
4129 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4131 off
= elf_tdata (abfd
)->next_file_pos
;
4132 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4134 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4135 incorrect. We do not yet know the size of the .symtab section.
4136 We correct next_file_pos below, after we do know the size. */
4138 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4139 continuously seeking to the right position in the file. */
4140 if (! info
->keep_memory
|| max_sym_count
< 20)
4141 finfo
.symbuf_size
= 20;
4143 finfo
.symbuf_size
= max_sym_count
;
4144 finfo
.symbuf
= ((Elf_External_Sym
*)
4145 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4146 if (finfo
.symbuf
== NULL
)
4149 /* Start writing out the symbol table. The first symbol is always a
4151 if (info
->strip
!= strip_all
|| info
->relocateable
)
4153 elfsym
.st_value
= 0;
4156 elfsym
.st_other
= 0;
4157 elfsym
.st_shndx
= SHN_UNDEF
;
4158 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4159 &elfsym
, bfd_und_section_ptr
))
4164 /* Some standard ELF linkers do this, but we don't because it causes
4165 bootstrap comparison failures. */
4166 /* Output a file symbol for the output file as the second symbol.
4167 We output this even if we are discarding local symbols, although
4168 I'm not sure if this is correct. */
4169 elfsym
.st_value
= 0;
4171 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4172 elfsym
.st_other
= 0;
4173 elfsym
.st_shndx
= SHN_ABS
;
4174 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4175 &elfsym
, bfd_abs_section_ptr
))
4179 /* Output a symbol for each section. We output these even if we are
4180 discarding local symbols, since they are used for relocs. These
4181 symbols have no names. We store the index of each one in the
4182 index field of the section, so that we can find it again when
4183 outputting relocs. */
4184 if (info
->strip
!= strip_all
|| info
->relocateable
)
4187 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4188 elfsym
.st_other
= 0;
4189 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4191 o
= section_from_elf_index (abfd
, i
);
4193 o
->target_index
= bfd_get_symcount (abfd
);
4194 elfsym
.st_shndx
= i
;
4195 if (info
->relocateable
|| o
== NULL
)
4196 elfsym
.st_value
= 0;
4198 elfsym
.st_value
= o
->vma
;
4199 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4205 /* Allocate some memory to hold information read in from the input
4207 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4208 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4209 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4210 bfd_malloc (max_internal_reloc_count
4211 * sizeof (Elf_Internal_Rela
)
4212 * bed
->s
->int_rels_per_ext_rel
));
4213 finfo
.external_syms
= ((Elf_External_Sym
*)
4214 bfd_malloc (max_sym_count
4215 * sizeof (Elf_External_Sym
)));
4216 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4217 bfd_malloc (max_sym_count
4218 * sizeof (Elf_Internal_Sym
)));
4219 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4220 finfo
.sections
= ((asection
**)
4221 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4222 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4223 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4224 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4225 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4226 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4227 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4228 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4231 /* Since ELF permits relocations to be against local symbols, we
4232 must have the local symbols available when we do the relocations.
4233 Since we would rather only read the local symbols once, and we
4234 would rather not keep them in memory, we handle all the
4235 relocations for a single input file at the same time.
4237 Unfortunately, there is no way to know the total number of local
4238 symbols until we have seen all of them, and the local symbol
4239 indices precede the global symbol indices. This means that when
4240 we are generating relocateable output, and we see a reloc against
4241 a global symbol, we can not know the symbol index until we have
4242 finished examining all the local symbols to see which ones we are
4243 going to output. To deal with this, we keep the relocations in
4244 memory, and don't output them until the end of the link. This is
4245 an unfortunate waste of memory, but I don't see a good way around
4246 it. Fortunately, it only happens when performing a relocateable
4247 link, which is not the common case. FIXME: If keep_memory is set
4248 we could write the relocs out and then read them again; I don't
4249 know how bad the memory loss will be. */
4251 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4252 sub
->output_has_begun
= false;
4253 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4255 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4257 if (p
->type
== bfd_indirect_link_order
4258 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4259 == bfd_target_elf_flavour
))
4261 sub
= p
->u
.indirect
.section
->owner
;
4262 if (! sub
->output_has_begun
)
4264 if (! elf_link_input_bfd (&finfo
, sub
))
4266 sub
->output_has_begun
= true;
4269 else if (p
->type
== bfd_section_reloc_link_order
4270 || p
->type
== bfd_symbol_reloc_link_order
)
4272 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4277 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4283 /* That wrote out all the local symbols. Finish up the symbol table
4284 with the global symbols. */
4286 if (info
->strip
!= strip_all
&& info
->shared
)
4288 /* Output any global symbols that got converted to local in a
4289 version script. We do this in a separate step since ELF
4290 requires all local symbols to appear prior to any global
4291 symbols. FIXME: We should only do this if some global
4292 symbols were, in fact, converted to become local. FIXME:
4293 Will this work correctly with the Irix 5 linker? */
4294 eoinfo
.failed
= false;
4295 eoinfo
.finfo
= &finfo
;
4296 eoinfo
.localsyms
= true;
4297 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4303 /* The sh_info field records the index of the first non local symbol. */
4304 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4308 Elf_Internal_Sym sym
;
4309 Elf_External_Sym
*dynsym
=
4310 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4311 unsigned long last_local
= 0;
4313 /* Write out the section symbols for the output sections. */
4320 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4323 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4326 indx
= elf_section_data (s
)->this_idx
;
4327 BFD_ASSERT (indx
> 0);
4328 sym
.st_shndx
= indx
;
4329 sym
.st_value
= s
->vma
;
4331 elf_swap_symbol_out (abfd
, &sym
,
4332 dynsym
+ elf_section_data (s
)->dynindx
);
4335 last_local
= bfd_count_sections (abfd
);
4338 /* Write out the local dynsyms. */
4339 if (elf_hash_table (info
)->dynlocal
)
4341 struct elf_link_local_dynamic_entry
*e
;
4342 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4346 sym
.st_size
= e
->isym
.st_size
;
4347 sym
.st_other
= e
->isym
.st_other
;
4349 /* Copy the internal symbol as is.
4350 Note that we saved a word of storage and overwrote
4351 the original st_name with the dynstr_index. */
4354 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4356 s
= bfd_section_from_elf_index (e
->input_bfd
,
4360 elf_section_data (s
->output_section
)->this_idx
;
4361 sym
.st_value
= (s
->output_section
->vma
4363 + e
->isym
.st_value
);
4366 if (last_local
< e
->dynindx
)
4367 last_local
= e
->dynindx
;
4369 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4373 elf_section_data (finfo
.dynsym_sec
->output_section
)
4374 ->this_hdr
.sh_info
= last_local
+ 1;
4377 /* We get the global symbols from the hash table. */
4378 eoinfo
.failed
= false;
4379 eoinfo
.localsyms
= false;
4380 eoinfo
.finfo
= &finfo
;
4381 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4386 /* If backend needs to output some symbols not present in the hash
4387 table, do it now. */
4388 if (bed
->elf_backend_output_arch_syms
)
4390 if (! (*bed
->elf_backend_output_arch_syms
)
4391 (abfd
, info
, (PTR
) &finfo
,
4392 (boolean (*) PARAMS ((PTR
, const char *,
4393 Elf_Internal_Sym
*, asection
*)))
4394 elf_link_output_sym
))
4398 /* Flush all symbols to the file. */
4399 if (! elf_link_flush_output_syms (&finfo
))
4402 /* Now we know the size of the symtab section. */
4403 off
+= symtab_hdr
->sh_size
;
4405 /* Finish up and write out the symbol string table (.strtab)
4407 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4408 /* sh_name was set in prep_headers. */
4409 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4410 symstrtab_hdr
->sh_flags
= 0;
4411 symstrtab_hdr
->sh_addr
= 0;
4412 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4413 symstrtab_hdr
->sh_entsize
= 0;
4414 symstrtab_hdr
->sh_link
= 0;
4415 symstrtab_hdr
->sh_info
= 0;
4416 /* sh_offset is set just below. */
4417 symstrtab_hdr
->sh_addralign
= 1;
4419 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4420 elf_tdata (abfd
)->next_file_pos
= off
;
4422 if (bfd_get_symcount (abfd
) > 0)
4424 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4425 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4429 /* Adjust the relocs to have the correct symbol indices. */
4430 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4432 if ((o
->flags
& SEC_RELOC
) == 0)
4435 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4436 elf_section_data (o
)->rel_count
,
4437 elf_section_data (o
)->rel_hashes
);
4438 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4439 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4440 elf_section_data (o
)->rel_count2
,
4441 (elf_section_data (o
)->rel_hashes
4442 + elf_section_data (o
)->rel_count
));
4444 /* Set the reloc_count field to 0 to prevent write_relocs from
4445 trying to swap the relocs out itself. */
4449 /* If we are linking against a dynamic object, or generating a
4450 shared library, finish up the dynamic linking information. */
4453 Elf_External_Dyn
*dyncon
, *dynconend
;
4455 /* Fix up .dynamic entries. */
4456 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4457 BFD_ASSERT (o
!= NULL
);
4459 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4460 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4461 for (; dyncon
< dynconend
; dyncon
++)
4463 Elf_Internal_Dyn dyn
;
4467 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4474 name
= info
->init_function
;
4477 name
= info
->fini_function
;
4480 struct elf_link_hash_entry
*h
;
4482 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4483 false, false, true);
4485 && (h
->root
.type
== bfd_link_hash_defined
4486 || h
->root
.type
== bfd_link_hash_defweak
))
4488 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4489 o
= h
->root
.u
.def
.section
;
4490 if (o
->output_section
!= NULL
)
4491 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4492 + o
->output_offset
);
4495 /* The symbol is imported from another shared
4496 library and does not apply to this one. */
4500 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4515 name
= ".gnu.version_d";
4518 name
= ".gnu.version_r";
4521 name
= ".gnu.version";
4523 o
= bfd_get_section_by_name (abfd
, name
);
4524 BFD_ASSERT (o
!= NULL
);
4525 dyn
.d_un
.d_ptr
= o
->vma
;
4526 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4533 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4538 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4540 Elf_Internal_Shdr
*hdr
;
4542 hdr
= elf_elfsections (abfd
)[i
];
4543 if (hdr
->sh_type
== type
4544 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4546 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4547 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4550 if (dyn
.d_un
.d_val
== 0
4551 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4552 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4556 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4562 /* If we have created any dynamic sections, then output them. */
4565 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4568 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4570 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4571 || o
->_raw_size
== 0)
4573 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4575 /* At this point, we are only interested in sections
4576 created by elf_link_create_dynamic_sections. */
4579 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4581 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4583 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4584 o
->contents
, o
->output_offset
,
4592 /* The contents of the .dynstr section are actually in a
4594 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4595 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4596 || ! _bfd_stringtab_emit (abfd
,
4597 elf_hash_table (info
)->dynstr
))
4603 /* If we have optimized stabs strings, output them. */
4604 if (elf_hash_table (info
)->stab_info
!= NULL
)
4606 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4610 if (finfo
.symstrtab
!= NULL
)
4611 _bfd_stringtab_free (finfo
.symstrtab
);
4612 if (finfo
.contents
!= NULL
)
4613 free (finfo
.contents
);
4614 if (finfo
.external_relocs
!= NULL
)
4615 free (finfo
.external_relocs
);
4616 if (finfo
.internal_relocs
!= NULL
)
4617 free (finfo
.internal_relocs
);
4618 if (finfo
.external_syms
!= NULL
)
4619 free (finfo
.external_syms
);
4620 if (finfo
.internal_syms
!= NULL
)
4621 free (finfo
.internal_syms
);
4622 if (finfo
.indices
!= NULL
)
4623 free (finfo
.indices
);
4624 if (finfo
.sections
!= NULL
)
4625 free (finfo
.sections
);
4626 if (finfo
.symbuf
!= NULL
)
4627 free (finfo
.symbuf
);
4628 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4630 if ((o
->flags
& SEC_RELOC
) != 0
4631 && elf_section_data (o
)->rel_hashes
!= NULL
)
4632 free (elf_section_data (o
)->rel_hashes
);
4635 elf_tdata (abfd
)->linker
= true;
4640 if (finfo
.symstrtab
!= NULL
)
4641 _bfd_stringtab_free (finfo
.symstrtab
);
4642 if (finfo
.contents
!= NULL
)
4643 free (finfo
.contents
);
4644 if (finfo
.external_relocs
!= NULL
)
4645 free (finfo
.external_relocs
);
4646 if (finfo
.internal_relocs
!= NULL
)
4647 free (finfo
.internal_relocs
);
4648 if (finfo
.external_syms
!= NULL
)
4649 free (finfo
.external_syms
);
4650 if (finfo
.internal_syms
!= NULL
)
4651 free (finfo
.internal_syms
);
4652 if (finfo
.indices
!= NULL
)
4653 free (finfo
.indices
);
4654 if (finfo
.sections
!= NULL
)
4655 free (finfo
.sections
);
4656 if (finfo
.symbuf
!= NULL
)
4657 free (finfo
.symbuf
);
4658 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4660 if ((o
->flags
& SEC_RELOC
) != 0
4661 && elf_section_data (o
)->rel_hashes
!= NULL
)
4662 free (elf_section_data (o
)->rel_hashes
);
4668 /* Add a symbol to the output symbol table. */
4671 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4672 struct elf_final_link_info
*finfo
;
4674 Elf_Internal_Sym
*elfsym
;
4675 asection
*input_sec
;
4677 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4678 struct bfd_link_info
*info
,
4683 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4684 elf_backend_link_output_symbol_hook
;
4685 if (output_symbol_hook
!= NULL
)
4687 if (! ((*output_symbol_hook
)
4688 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4692 if (name
== (const char *) NULL
|| *name
== '\0')
4693 elfsym
->st_name
= 0;
4694 else if (input_sec
->flags
& SEC_EXCLUDE
)
4695 elfsym
->st_name
= 0;
4698 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4701 if (elfsym
->st_name
== (unsigned long) -1)
4705 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4707 if (! elf_link_flush_output_syms (finfo
))
4711 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4712 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4713 ++finfo
->symbuf_count
;
4715 ++ bfd_get_symcount (finfo
->output_bfd
);
4720 /* Flush the output symbols to the file. */
4723 elf_link_flush_output_syms (finfo
)
4724 struct elf_final_link_info
*finfo
;
4726 if (finfo
->symbuf_count
> 0)
4728 Elf_Internal_Shdr
*symtab
;
4730 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4732 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4734 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4735 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4736 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4739 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4741 finfo
->symbuf_count
= 0;
4747 /* Add an external symbol to the symbol table. This is called from
4748 the hash table traversal routine. When generating a shared object,
4749 we go through the symbol table twice. The first time we output
4750 anything that might have been forced to local scope in a version
4751 script. The second time we output the symbols that are still
4755 elf_link_output_extsym (h
, data
)
4756 struct elf_link_hash_entry
*h
;
4759 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4760 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4762 Elf_Internal_Sym sym
;
4763 asection
*input_sec
;
4765 /* Decide whether to output this symbol in this pass. */
4766 if (eoinfo
->localsyms
)
4768 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4773 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4777 /* If we are not creating a shared library, and this symbol is
4778 referenced by a shared library but is not defined anywhere, then
4779 warn that it is undefined. If we do not do this, the runtime
4780 linker will complain that the symbol is undefined when the
4781 program is run. We don't have to worry about symbols that are
4782 referenced by regular files, because we will already have issued
4783 warnings for them. */
4784 if (! finfo
->info
->relocateable
4785 && ! (finfo
->info
->shared
4786 && !finfo
->info
->no_undefined
)
4787 && h
->root
.type
== bfd_link_hash_undefined
4788 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4789 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4791 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4792 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4793 (asection
*) NULL
, 0)))
4795 eoinfo
->failed
= true;
4800 /* We don't want to output symbols that have never been mentioned by
4801 a regular file, or that we have been told to strip. However, if
4802 h->indx is set to -2, the symbol is used by a reloc and we must
4806 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4807 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4808 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4809 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4811 else if (finfo
->info
->strip
== strip_all
4812 || (finfo
->info
->strip
== strip_some
4813 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4814 h
->root
.root
.string
,
4815 false, false) == NULL
))
4820 /* If we're stripping it, and it's not a dynamic symbol, there's
4821 nothing else to do. */
4822 if (strip
&& h
->dynindx
== -1)
4826 sym
.st_size
= h
->size
;
4827 sym
.st_other
= h
->other
;
4828 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4829 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4830 else if (h
->root
.type
== bfd_link_hash_undefweak
4831 || h
->root
.type
== bfd_link_hash_defweak
)
4832 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4834 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4836 switch (h
->root
.type
)
4839 case bfd_link_hash_new
:
4843 case bfd_link_hash_undefined
:
4844 input_sec
= bfd_und_section_ptr
;
4845 sym
.st_shndx
= SHN_UNDEF
;
4848 case bfd_link_hash_undefweak
:
4849 input_sec
= bfd_und_section_ptr
;
4850 sym
.st_shndx
= SHN_UNDEF
;
4853 case bfd_link_hash_defined
:
4854 case bfd_link_hash_defweak
:
4856 input_sec
= h
->root
.u
.def
.section
;
4857 if (input_sec
->output_section
!= NULL
)
4860 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4861 input_sec
->output_section
);
4862 if (sym
.st_shndx
== (unsigned short) -1)
4864 (*_bfd_error_handler
)
4865 (_("%s: could not find output section %s for input section %s"),
4866 bfd_get_filename (finfo
->output_bfd
),
4867 input_sec
->output_section
->name
,
4869 eoinfo
->failed
= true;
4873 /* ELF symbols in relocateable files are section relative,
4874 but in nonrelocateable files they are virtual
4876 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4877 if (! finfo
->info
->relocateable
)
4878 sym
.st_value
+= input_sec
->output_section
->vma
;
4882 BFD_ASSERT (input_sec
->owner
== NULL
4883 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4884 sym
.st_shndx
= SHN_UNDEF
;
4885 input_sec
= bfd_und_section_ptr
;
4890 case bfd_link_hash_common
:
4891 input_sec
= h
->root
.u
.c
.p
->section
;
4892 sym
.st_shndx
= SHN_COMMON
;
4893 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4896 case bfd_link_hash_indirect
:
4897 /* These symbols are created by symbol versioning. They point
4898 to the decorated version of the name. For example, if the
4899 symbol foo@@GNU_1.2 is the default, which should be used when
4900 foo is used with no version, then we add an indirect symbol
4901 foo which points to foo@@GNU_1.2. We ignore these symbols,
4902 since the indirected symbol is already in the hash table. If
4903 the indirect symbol is non-ELF, fall through and output it. */
4904 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4908 case bfd_link_hash_warning
:
4909 /* We can't represent these symbols in ELF, although a warning
4910 symbol may have come from a .gnu.warning.SYMBOL section. We
4911 just put the target symbol in the hash table. If the target
4912 symbol does not really exist, don't do anything. */
4913 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4915 return (elf_link_output_extsym
4916 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4919 /* Give the processor backend a chance to tweak the symbol value,
4920 and also to finish up anything that needs to be done for this
4922 if ((h
->dynindx
!= -1
4923 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4924 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4926 struct elf_backend_data
*bed
;
4928 bed
= get_elf_backend_data (finfo
->output_bfd
);
4929 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4930 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4932 eoinfo
->failed
= true;
4937 /* If we are marking the symbol as undefined, and there are no
4938 non-weak references to this symbol from a regular object, then
4939 mark the symbol as weak undefined; if there are non-weak
4940 references, mark the symbol as strong. We can't do this earlier,
4941 because it might not be marked as undefined until the
4942 finish_dynamic_symbol routine gets through with it. */
4943 if (sym
.st_shndx
== SHN_UNDEF
4944 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
4945 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
4946 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
4950 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
4951 bindtype
= STB_GLOBAL
;
4953 bindtype
= STB_WEAK
;
4954 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
4957 /* If this symbol should be put in the .dynsym section, then put it
4958 there now. We have already know the symbol index. We also fill
4959 in the entry in the .hash section. */
4960 if (h
->dynindx
!= -1
4961 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4965 size_t hash_entry_size
;
4966 bfd_byte
*bucketpos
;
4969 sym
.st_name
= h
->dynstr_index
;
4971 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4972 (PTR
) (((Elf_External_Sym
*)
4973 finfo
->dynsym_sec
->contents
)
4976 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4977 bucket
= h
->elf_hash_value
% bucketcount
;
4979 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
4980 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4981 + (bucket
+ 2) * hash_entry_size
);
4982 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
4983 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4984 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
4985 ((bfd_byte
*) finfo
->hash_sec
->contents
4986 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
4988 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4990 Elf_Internal_Versym iversym
;
4992 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4994 if (h
->verinfo
.verdef
== NULL
)
4995 iversym
.vs_vers
= 0;
4997 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
5001 if (h
->verinfo
.vertree
== NULL
)
5002 iversym
.vs_vers
= 1;
5004 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
5007 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
5008 iversym
.vs_vers
|= VERSYM_HIDDEN
;
5010 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
5011 (((Elf_External_Versym
*)
5012 finfo
->symver_sec
->contents
)
5017 /* If we're stripping it, then it was just a dynamic symbol, and
5018 there's nothing else to do. */
5022 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
5024 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
5026 eoinfo
->failed
= true;
5033 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5034 originated from the section given by INPUT_REL_HDR) to the
5038 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
5041 asection
*input_section
;
5042 Elf_Internal_Shdr
*input_rel_hdr
;
5043 Elf_Internal_Rela
*internal_relocs
;
5045 Elf_Internal_Rela
*irela
;
5046 Elf_Internal_Rela
*irelaend
;
5047 Elf_Internal_Shdr
*output_rel_hdr
;
5048 asection
*output_section
;
5049 unsigned int *rel_countp
= NULL
;
5051 output_section
= input_section
->output_section
;
5052 output_rel_hdr
= NULL
;
5054 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
5055 == input_rel_hdr
->sh_entsize
)
5057 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5058 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5060 else if (elf_section_data (output_section
)->rel_hdr2
5061 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5062 == input_rel_hdr
->sh_entsize
))
5064 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5065 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5068 BFD_ASSERT (output_rel_hdr
!= NULL
);
5070 irela
= internal_relocs
;
5071 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5072 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5074 Elf_External_Rel
*erel
;
5076 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5077 for (; irela
< irelaend
; irela
++, erel
++)
5079 Elf_Internal_Rel irel
;
5081 irel
.r_offset
= irela
->r_offset
;
5082 irel
.r_info
= irela
->r_info
;
5083 BFD_ASSERT (irela
->r_addend
== 0);
5084 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5089 Elf_External_Rela
*erela
;
5091 BFD_ASSERT (input_rel_hdr
->sh_entsize
5092 == sizeof (Elf_External_Rela
));
5093 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5094 for (; irela
< irelaend
; irela
++, erela
++)
5095 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5098 /* Bump the counter, so that we know where to add the next set of
5100 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5103 /* Link an input file into the linker output file. This function
5104 handles all the sections and relocations of the input file at once.
5105 This is so that we only have to read the local symbols once, and
5106 don't have to keep them in memory. */
5109 elf_link_input_bfd (finfo
, input_bfd
)
5110 struct elf_final_link_info
*finfo
;
5113 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5114 bfd
*, asection
*, bfd_byte
*,
5115 Elf_Internal_Rela
*,
5116 Elf_Internal_Sym
*, asection
**));
5118 Elf_Internal_Shdr
*symtab_hdr
;
5121 Elf_External_Sym
*external_syms
;
5122 Elf_External_Sym
*esym
;
5123 Elf_External_Sym
*esymend
;
5124 Elf_Internal_Sym
*isym
;
5126 asection
**ppsection
;
5128 struct elf_backend_data
*bed
;
5130 output_bfd
= finfo
->output_bfd
;
5131 bed
= get_elf_backend_data (output_bfd
);
5132 relocate_section
= bed
->elf_backend_relocate_section
;
5134 /* If this is a dynamic object, we don't want to do anything here:
5135 we don't want the local symbols, and we don't want the section
5137 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5140 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5141 if (elf_bad_symtab (input_bfd
))
5143 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5148 locsymcount
= symtab_hdr
->sh_info
;
5149 extsymoff
= symtab_hdr
->sh_info
;
5152 /* Read the local symbols. */
5153 if (symtab_hdr
->contents
!= NULL
)
5154 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5155 else if (locsymcount
== 0)
5156 external_syms
= NULL
;
5159 external_syms
= finfo
->external_syms
;
5160 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5161 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5162 locsymcount
, input_bfd
)
5163 != locsymcount
* sizeof (Elf_External_Sym
)))
5167 /* Swap in the local symbols and write out the ones which we know
5168 are going into the output file. */
5169 esym
= external_syms
;
5170 esymend
= esym
+ locsymcount
;
5171 isym
= finfo
->internal_syms
;
5172 pindex
= finfo
->indices
;
5173 ppsection
= finfo
->sections
;
5174 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5178 Elf_Internal_Sym osym
;
5180 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5183 if (elf_bad_symtab (input_bfd
))
5185 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5192 if (isym
->st_shndx
== SHN_UNDEF
)
5193 isec
= bfd_und_section_ptr
;
5194 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5195 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5196 else if (isym
->st_shndx
== SHN_ABS
)
5197 isec
= bfd_abs_section_ptr
;
5198 else if (isym
->st_shndx
== SHN_COMMON
)
5199 isec
= bfd_com_section_ptr
;
5208 /* Don't output the first, undefined, symbol. */
5209 if (esym
== external_syms
)
5212 /* If we are stripping all symbols, we don't want to output this
5214 if (finfo
->info
->strip
== strip_all
)
5217 /* We never output section symbols. Instead, we use the section
5218 symbol of the corresponding section in the output file. */
5219 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5222 /* If we are discarding all local symbols, we don't want to
5223 output this one. If we are generating a relocateable output
5224 file, then some of the local symbols may be required by
5225 relocs; we output them below as we discover that they are
5227 if (finfo
->info
->discard
== discard_all
)
5230 /* If this symbol is defined in a section which we are
5231 discarding, we don't need to keep it, but note that
5232 linker_mark is only reliable for sections that have contents.
5233 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5234 as well as linker_mark. */
5235 if (isym
->st_shndx
> 0
5236 && isym
->st_shndx
< SHN_LORESERVE
5238 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5239 || (! finfo
->info
->relocateable
5240 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5243 /* Get the name of the symbol. */
5244 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5249 /* See if we are discarding symbols with this name. */
5250 if ((finfo
->info
->strip
== strip_some
5251 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5253 || (finfo
->info
->discard
== discard_l
5254 && bfd_is_local_label_name (input_bfd
, name
)))
5257 /* If we get here, we are going to output this symbol. */
5261 /* Adjust the section index for the output file. */
5262 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5263 isec
->output_section
);
5264 if (osym
.st_shndx
== (unsigned short) -1)
5267 *pindex
= bfd_get_symcount (output_bfd
);
5269 /* ELF symbols in relocateable files are section relative, but
5270 in executable files they are virtual addresses. Note that
5271 this code assumes that all ELF sections have an associated
5272 BFD section with a reasonable value for output_offset; below
5273 we assume that they also have a reasonable value for
5274 output_section. Any special sections must be set up to meet
5275 these requirements. */
5276 osym
.st_value
+= isec
->output_offset
;
5277 if (! finfo
->info
->relocateable
)
5278 osym
.st_value
+= isec
->output_section
->vma
;
5280 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5284 /* Relocate the contents of each section. */
5285 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5289 if (! o
->linker_mark
)
5291 /* This section was omitted from the link. */
5295 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5296 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5299 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5301 /* Section was created by elf_link_create_dynamic_sections
5306 /* Get the contents of the section. They have been cached by a
5307 relaxation routine. Note that o is a section in an input
5308 file, so the contents field will not have been set by any of
5309 the routines which work on output files. */
5310 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5311 contents
= elf_section_data (o
)->this_hdr
.contents
;
5314 contents
= finfo
->contents
;
5315 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5316 (file_ptr
) 0, o
->_raw_size
))
5320 if ((o
->flags
& SEC_RELOC
) != 0)
5322 Elf_Internal_Rela
*internal_relocs
;
5324 /* Get the swapped relocs. */
5325 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5326 (input_bfd
, o
, finfo
->external_relocs
,
5327 finfo
->internal_relocs
, false));
5328 if (internal_relocs
== NULL
5329 && o
->reloc_count
> 0)
5332 /* Relocate the section by invoking a back end routine.
5334 The back end routine is responsible for adjusting the
5335 section contents as necessary, and (if using Rela relocs
5336 and generating a relocateable output file) adjusting the
5337 reloc addend as necessary.
5339 The back end routine does not have to worry about setting
5340 the reloc address or the reloc symbol index.
5342 The back end routine is given a pointer to the swapped in
5343 internal symbols, and can access the hash table entries
5344 for the external symbols via elf_sym_hashes (input_bfd).
5346 When generating relocateable output, the back end routine
5347 must handle STB_LOCAL/STT_SECTION symbols specially. The
5348 output symbol is going to be a section symbol
5349 corresponding to the output section, which will require
5350 the addend to be adjusted. */
5352 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5353 input_bfd
, o
, contents
,
5355 finfo
->internal_syms
,
5359 if (finfo
->info
->relocateable
)
5361 Elf_Internal_Rela
*irela
;
5362 Elf_Internal_Rela
*irelaend
;
5363 struct elf_link_hash_entry
**rel_hash
;
5364 Elf_Internal_Shdr
*input_rel_hdr
;
5366 /* Adjust the reloc addresses and symbol indices. */
5368 irela
= internal_relocs
;
5370 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5371 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5372 + elf_section_data (o
->output_section
)->rel_count
5373 + elf_section_data (o
->output_section
)->rel_count2
);
5374 for (; irela
< irelaend
; irela
++, rel_hash
++)
5376 unsigned long r_symndx
;
5377 Elf_Internal_Sym
*isym
;
5380 irela
->r_offset
+= o
->output_offset
;
5382 r_symndx
= ELF_R_SYM (irela
->r_info
);
5387 if (r_symndx
>= locsymcount
5388 || (elf_bad_symtab (input_bfd
)
5389 && finfo
->sections
[r_symndx
] == NULL
))
5391 struct elf_link_hash_entry
*rh
;
5394 /* This is a reloc against a global symbol. We
5395 have not yet output all the local symbols, so
5396 we do not know the symbol index of any global
5397 symbol. We set the rel_hash entry for this
5398 reloc to point to the global hash table entry
5399 for this symbol. The symbol index is then
5400 set at the end of elf_bfd_final_link. */
5401 indx
= r_symndx
- extsymoff
;
5402 rh
= elf_sym_hashes (input_bfd
)[indx
];
5403 while (rh
->root
.type
== bfd_link_hash_indirect
5404 || rh
->root
.type
== bfd_link_hash_warning
)
5405 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5407 /* Setting the index to -2 tells
5408 elf_link_output_extsym that this symbol is
5410 BFD_ASSERT (rh
->indx
< 0);
5418 /* This is a reloc against a local symbol. */
5421 isym
= finfo
->internal_syms
+ r_symndx
;
5422 sec
= finfo
->sections
[r_symndx
];
5423 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5425 /* I suppose the backend ought to fill in the
5426 section of any STT_SECTION symbol against a
5427 processor specific section. If we have
5428 discarded a section, the output_section will
5429 be the absolute section. */
5431 && (bfd_is_abs_section (sec
)
5432 || (sec
->output_section
!= NULL
5433 && bfd_is_abs_section (sec
->output_section
))))
5435 else if (sec
== NULL
|| sec
->owner
== NULL
)
5437 bfd_set_error (bfd_error_bad_value
);
5442 r_symndx
= sec
->output_section
->target_index
;
5443 BFD_ASSERT (r_symndx
!= 0);
5448 if (finfo
->indices
[r_symndx
] == -1)
5454 if (finfo
->info
->strip
== strip_all
)
5456 /* You can't do ld -r -s. */
5457 bfd_set_error (bfd_error_invalid_operation
);
5461 /* This symbol was skipped earlier, but
5462 since it is needed by a reloc, we
5463 must output it now. */
5464 link
= symtab_hdr
->sh_link
;
5465 name
= bfd_elf_string_from_elf_section (input_bfd
,
5471 osec
= sec
->output_section
;
5473 _bfd_elf_section_from_bfd_section (output_bfd
,
5475 if (isym
->st_shndx
== (unsigned short) -1)
5478 isym
->st_value
+= sec
->output_offset
;
5479 if (! finfo
->info
->relocateable
)
5480 isym
->st_value
+= osec
->vma
;
5482 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5484 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5488 r_symndx
= finfo
->indices
[r_symndx
];
5491 irela
->r_info
= ELF_R_INFO (r_symndx
,
5492 ELF_R_TYPE (irela
->r_info
));
5495 /* Swap out the relocs. */
5496 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5497 elf_link_output_relocs (output_bfd
, o
,
5501 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5502 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5504 elf_link_output_relocs (output_bfd
, o
,
5510 /* Write out the modified section contents. */
5511 if (elf_section_data (o
)->stab_info
== NULL
)
5513 if (! (o
->flags
& SEC_EXCLUDE
) &&
5514 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5515 contents
, o
->output_offset
,
5516 (o
->_cooked_size
!= 0
5523 if (! (_bfd_write_section_stabs
5524 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5525 o
, &elf_section_data (o
)->stab_info
, contents
)))
5533 /* Generate a reloc when linking an ELF file. This is a reloc
5534 requested by the linker, and does come from any input file. This
5535 is used to build constructor and destructor tables when linking
5539 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5541 struct bfd_link_info
*info
;
5542 asection
*output_section
;
5543 struct bfd_link_order
*link_order
;
5545 reloc_howto_type
*howto
;
5549 struct elf_link_hash_entry
**rel_hash_ptr
;
5550 Elf_Internal_Shdr
*rel_hdr
;
5552 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5555 bfd_set_error (bfd_error_bad_value
);
5559 addend
= link_order
->u
.reloc
.p
->addend
;
5561 /* Figure out the symbol index. */
5562 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5563 + elf_section_data (output_section
)->rel_count
5564 + elf_section_data (output_section
)->rel_count2
);
5565 if (link_order
->type
== bfd_section_reloc_link_order
)
5567 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5568 BFD_ASSERT (indx
!= 0);
5569 *rel_hash_ptr
= NULL
;
5573 struct elf_link_hash_entry
*h
;
5575 /* Treat a reloc against a defined symbol as though it were
5576 actually against the section. */
5577 h
= ((struct elf_link_hash_entry
*)
5578 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5579 link_order
->u
.reloc
.p
->u
.name
,
5580 false, false, true));
5582 && (h
->root
.type
== bfd_link_hash_defined
5583 || h
->root
.type
== bfd_link_hash_defweak
))
5587 section
= h
->root
.u
.def
.section
;
5588 indx
= section
->output_section
->target_index
;
5589 *rel_hash_ptr
= NULL
;
5590 /* It seems that we ought to add the symbol value to the
5591 addend here, but in practice it has already been added
5592 because it was passed to constructor_callback. */
5593 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5597 /* Setting the index to -2 tells elf_link_output_extsym that
5598 this symbol is used by a reloc. */
5605 if (! ((*info
->callbacks
->unattached_reloc
)
5606 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5607 (asection
*) NULL
, (bfd_vma
) 0)))
5613 /* If this is an inplace reloc, we must write the addend into the
5615 if (howto
->partial_inplace
&& addend
!= 0)
5618 bfd_reloc_status_type rstat
;
5622 size
= bfd_get_reloc_size (howto
);
5623 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5624 if (buf
== (bfd_byte
*) NULL
)
5626 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5632 case bfd_reloc_outofrange
:
5634 case bfd_reloc_overflow
:
5635 if (! ((*info
->callbacks
->reloc_overflow
)
5637 (link_order
->type
== bfd_section_reloc_link_order
5638 ? bfd_section_name (output_bfd
,
5639 link_order
->u
.reloc
.p
->u
.section
)
5640 : link_order
->u
.reloc
.p
->u
.name
),
5641 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5649 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5650 (file_ptr
) link_order
->offset
, size
);
5656 /* The address of a reloc is relative to the section in a
5657 relocateable file, and is a virtual address in an executable
5659 offset
= link_order
->offset
;
5660 if (! info
->relocateable
)
5661 offset
+= output_section
->vma
;
5663 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5665 if (rel_hdr
->sh_type
== SHT_REL
)
5667 Elf_Internal_Rel irel
;
5668 Elf_External_Rel
*erel
;
5670 irel
.r_offset
= offset
;
5671 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5672 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5673 + elf_section_data (output_section
)->rel_count
);
5674 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5678 Elf_Internal_Rela irela
;
5679 Elf_External_Rela
*erela
;
5681 irela
.r_offset
= offset
;
5682 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5683 irela
.r_addend
= addend
;
5684 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5685 + elf_section_data (output_section
)->rel_count
);
5686 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5689 ++elf_section_data (output_section
)->rel_count
;
5695 /* Allocate a pointer to live in a linker created section. */
5698 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5700 struct bfd_link_info
*info
;
5701 elf_linker_section_t
*lsect
;
5702 struct elf_link_hash_entry
*h
;
5703 const Elf_Internal_Rela
*rel
;
5705 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5706 elf_linker_section_pointers_t
*linker_section_ptr
;
5707 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5709 BFD_ASSERT (lsect
!= NULL
);
5711 /* Is this a global symbol? */
5714 /* Has this symbol already been allocated, if so, our work is done */
5715 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5720 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5721 /* Make sure this symbol is output as a dynamic symbol. */
5722 if (h
->dynindx
== -1)
5724 if (! elf_link_record_dynamic_symbol (info
, h
))
5728 if (lsect
->rel_section
)
5729 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5732 else /* Allocation of a pointer to a local symbol */
5734 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5736 /* Allocate a table to hold the local symbols if first time */
5739 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5740 register unsigned int i
;
5742 ptr
= (elf_linker_section_pointers_t
**)
5743 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5748 elf_local_ptr_offsets (abfd
) = ptr
;
5749 for (i
= 0; i
< num_symbols
; i
++)
5750 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5753 /* Has this symbol already been allocated, if so, our work is done */
5754 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5759 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5763 /* If we are generating a shared object, we need to
5764 output a R_<xxx>_RELATIVE reloc so that the
5765 dynamic linker can adjust this GOT entry. */
5766 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5767 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5771 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5772 from internal memory. */
5773 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5774 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5775 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5777 if (!linker_section_ptr
)
5780 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5781 linker_section_ptr
->addend
= rel
->r_addend
;
5782 linker_section_ptr
->which
= lsect
->which
;
5783 linker_section_ptr
->written_address_p
= false;
5784 *ptr_linker_section_ptr
= linker_section_ptr
;
5787 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5789 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5790 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5791 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5792 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5794 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5796 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5797 lsect
->sym_hash
->root
.root
.string
,
5798 (long)ARCH_SIZE
/ 8,
5799 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5805 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5807 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5810 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5811 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5819 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5822 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5825 /* Fill in the address for a pointer generated in alinker section. */
5828 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5831 struct bfd_link_info
*info
;
5832 elf_linker_section_t
*lsect
;
5833 struct elf_link_hash_entry
*h
;
5835 const Elf_Internal_Rela
*rel
;
5838 elf_linker_section_pointers_t
*linker_section_ptr
;
5840 BFD_ASSERT (lsect
!= NULL
);
5842 if (h
!= NULL
) /* global symbol */
5844 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5848 BFD_ASSERT (linker_section_ptr
!= NULL
);
5850 if (! elf_hash_table (info
)->dynamic_sections_created
5853 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5855 /* This is actually a static link, or it is a
5856 -Bsymbolic link and the symbol is defined
5857 locally. We must initialize this entry in the
5860 When doing a dynamic link, we create a .rela.<xxx>
5861 relocation entry to initialize the value. This
5862 is done in the finish_dynamic_symbol routine. */
5863 if (!linker_section_ptr
->written_address_p
)
5865 linker_section_ptr
->written_address_p
= true;
5866 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5867 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5871 else /* local symbol */
5873 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5874 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5875 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5876 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5880 BFD_ASSERT (linker_section_ptr
!= NULL
);
5882 /* Write out pointer if it hasn't been rewritten out before */
5883 if (!linker_section_ptr
->written_address_p
)
5885 linker_section_ptr
->written_address_p
= true;
5886 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5887 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5891 asection
*srel
= lsect
->rel_section
;
5892 Elf_Internal_Rela outrel
;
5894 /* We need to generate a relative reloc for the dynamic linker. */
5896 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5899 BFD_ASSERT (srel
!= NULL
);
5901 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5902 + lsect
->section
->output_offset
5903 + linker_section_ptr
->offset
);
5904 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5905 outrel
.r_addend
= 0;
5906 elf_swap_reloca_out (output_bfd
, &outrel
,
5907 (((Elf_External_Rela
*)
5908 lsect
->section
->contents
)
5909 + elf_section_data (lsect
->section
)->rel_count
));
5910 ++elf_section_data (lsect
->section
)->rel_count
;
5915 relocation
= (lsect
->section
->output_offset
5916 + linker_section_ptr
->offset
5917 - lsect
->hole_offset
5918 - lsect
->sym_offset
);
5921 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5922 lsect
->name
, (long)relocation
, (long)relocation
);
5925 /* Subtract out the addend, because it will get added back in by the normal
5927 return relocation
- linker_section_ptr
->addend
;
5930 /* Garbage collect unused sections. */
5932 static boolean elf_gc_mark
5933 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5934 asection
* (*gc_mark_hook
)
5935 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5936 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5938 static boolean elf_gc_sweep
5939 PARAMS ((struct bfd_link_info
*info
,
5940 boolean (*gc_sweep_hook
)
5941 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5942 const Elf_Internal_Rela
*relocs
))));
5944 static boolean elf_gc_sweep_symbol
5945 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5947 static boolean elf_gc_allocate_got_offsets
5948 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5950 static boolean elf_gc_propagate_vtable_entries_used
5951 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5953 static boolean elf_gc_smash_unused_vtentry_relocs
5954 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5956 /* The mark phase of garbage collection. For a given section, mark
5957 it, and all the sections which define symbols to which it refers. */
5960 elf_gc_mark (info
, sec
, gc_mark_hook
)
5961 struct bfd_link_info
*info
;
5963 asection
* (*gc_mark_hook
)
5964 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5965 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
5971 /* Look through the section relocs. */
5973 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
5975 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
5976 Elf_Internal_Shdr
*symtab_hdr
;
5977 struct elf_link_hash_entry
**sym_hashes
;
5980 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
5981 bfd
*input_bfd
= sec
->owner
;
5982 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
5984 /* GCFIXME: how to arrange so that relocs and symbols are not
5985 reread continually? */
5987 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5988 sym_hashes
= elf_sym_hashes (input_bfd
);
5990 /* Read the local symbols. */
5991 if (elf_bad_symtab (input_bfd
))
5993 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5997 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
5998 if (symtab_hdr
->contents
)
5999 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6000 else if (nlocsyms
== 0)
6004 locsyms
= freesyms
=
6005 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
6006 if (freesyms
== NULL
6007 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6008 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
6009 nlocsyms
, input_bfd
)
6010 != nlocsyms
* sizeof (Elf_External_Sym
)))
6017 /* Read the relocations. */
6018 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6019 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
6020 info
->keep_memory
));
6021 if (relstart
== NULL
)
6026 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6028 for (rel
= relstart
; rel
< relend
; rel
++)
6030 unsigned long r_symndx
;
6032 struct elf_link_hash_entry
*h
;
6035 r_symndx
= ELF_R_SYM (rel
->r_info
);
6039 if (elf_bad_symtab (sec
->owner
))
6041 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6042 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
6043 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6046 h
= sym_hashes
[r_symndx
- extsymoff
];
6047 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6050 else if (r_symndx
>= nlocsyms
)
6052 h
= sym_hashes
[r_symndx
- extsymoff
];
6053 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6057 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6058 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6061 if (rsec
&& !rsec
->gc_mark
)
6062 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6070 if (!info
->keep_memory
)
6080 /* The sweep phase of garbage collection. Remove all garbage sections. */
6083 elf_gc_sweep (info
, gc_sweep_hook
)
6084 struct bfd_link_info
*info
;
6085 boolean (*gc_sweep_hook
)
6086 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6087 const Elf_Internal_Rela
*relocs
));
6091 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6095 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6097 /* Keep special sections. Keep .debug sections. */
6098 if ((o
->flags
& SEC_LINKER_CREATED
)
6099 || (o
->flags
& SEC_DEBUGGING
))
6105 /* Skip sweeping sections already excluded. */
6106 if (o
->flags
& SEC_EXCLUDE
)
6109 /* Since this is early in the link process, it is simple
6110 to remove a section from the output. */
6111 o
->flags
|= SEC_EXCLUDE
;
6113 /* But we also have to update some of the relocation
6114 info we collected before. */
6116 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6118 Elf_Internal_Rela
*internal_relocs
;
6121 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6122 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6123 if (internal_relocs
== NULL
)
6126 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6128 if (!info
->keep_memory
)
6129 free (internal_relocs
);
6137 /* Remove the symbols that were in the swept sections from the dynamic
6138 symbol table. GCFIXME: Anyone know how to get them out of the
6139 static symbol table as well? */
6143 elf_link_hash_traverse (elf_hash_table (info
),
6144 elf_gc_sweep_symbol
,
6147 elf_hash_table (info
)->dynsymcount
= i
;
6153 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6156 elf_gc_sweep_symbol (h
, idxptr
)
6157 struct elf_link_hash_entry
*h
;
6160 int *idx
= (int *) idxptr
;
6162 if (h
->dynindx
!= -1
6163 && ((h
->root
.type
!= bfd_link_hash_defined
6164 && h
->root
.type
!= bfd_link_hash_defweak
)
6165 || h
->root
.u
.def
.section
->gc_mark
))
6166 h
->dynindx
= (*idx
)++;
6171 /* Propogate collected vtable information. This is called through
6172 elf_link_hash_traverse. */
6175 elf_gc_propagate_vtable_entries_used (h
, okp
)
6176 struct elf_link_hash_entry
*h
;
6179 /* Those that are not vtables. */
6180 if (h
->vtable_parent
== NULL
)
6183 /* Those vtables that do not have parents, we cannot merge. */
6184 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6187 /* If we've already been done, exit. */
6188 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6191 /* Make sure the parent's table is up to date. */
6192 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6194 if (h
->vtable_entries_used
== NULL
)
6196 /* None of this table's entries were referenced. Re-use the
6198 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6199 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6206 /* Or the parent's entries into ours. */
6207 cu
= h
->vtable_entries_used
;
6209 pu
= h
->vtable_parent
->vtable_entries_used
;
6212 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6215 if (*pu
) *cu
= true;
6225 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6226 struct elf_link_hash_entry
*h
;
6230 bfd_vma hstart
, hend
;
6231 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6232 struct elf_backend_data
*bed
;
6234 /* Take care of both those symbols that do not describe vtables as
6235 well as those that are not loaded. */
6236 if (h
->vtable_parent
== NULL
)
6239 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6240 || h
->root
.type
== bfd_link_hash_defweak
);
6242 sec
= h
->root
.u
.def
.section
;
6243 hstart
= h
->root
.u
.def
.value
;
6244 hend
= hstart
+ h
->size
;
6246 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6247 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6249 return *(boolean
*)okp
= false;
6250 bed
= get_elf_backend_data (sec
->owner
);
6251 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6253 for (rel
= relstart
; rel
< relend
; ++rel
)
6254 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6256 /* If the entry is in use, do nothing. */
6257 if (h
->vtable_entries_used
6258 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6260 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6261 if (h
->vtable_entries_used
[entry
])
6264 /* Otherwise, kill it. */
6265 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6271 /* Do mark and sweep of unused sections. */
6274 elf_gc_sections (abfd
, info
)
6276 struct bfd_link_info
*info
;
6280 asection
* (*gc_mark_hook
)
6281 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6282 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6284 if (!get_elf_backend_data (abfd
)->can_gc_sections
6285 || info
->relocateable
6286 || elf_hash_table (info
)->dynamic_sections_created
)
6289 /* Apply transitive closure to the vtable entry usage info. */
6290 elf_link_hash_traverse (elf_hash_table (info
),
6291 elf_gc_propagate_vtable_entries_used
,
6296 /* Kill the vtable relocations that were not used. */
6297 elf_link_hash_traverse (elf_hash_table (info
),
6298 elf_gc_smash_unused_vtentry_relocs
,
6303 /* Grovel through relocs to find out who stays ... */
6305 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6306 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6309 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6311 if (o
->flags
& SEC_KEEP
)
6312 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6317 /* ... and mark SEC_EXCLUDE for those that go. */
6318 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6324 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6327 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6330 struct elf_link_hash_entry
*h
;
6333 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6334 struct elf_link_hash_entry
**search
, *child
;
6335 bfd_size_type extsymcount
;
6337 /* The sh_info field of the symtab header tells us where the
6338 external symbols start. We don't care about the local symbols at
6340 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6341 if (!elf_bad_symtab (abfd
))
6342 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6344 sym_hashes
= elf_sym_hashes (abfd
);
6345 sym_hashes_end
= sym_hashes
+ extsymcount
;
6347 /* Hunt down the child symbol, which is in this section at the same
6348 offset as the relocation. */
6349 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6351 if ((child
= *search
) != NULL
6352 && (child
->root
.type
== bfd_link_hash_defined
6353 || child
->root
.type
== bfd_link_hash_defweak
)
6354 && child
->root
.u
.def
.section
== sec
6355 && child
->root
.u
.def
.value
== offset
)
6359 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6360 bfd_get_filename (abfd
), sec
->name
,
6361 (unsigned long)offset
);
6362 bfd_set_error (bfd_error_invalid_operation
);
6368 /* This *should* only be the absolute section. It could potentially
6369 be that someone has defined a non-global vtable though, which
6370 would be bad. It isn't worth paging in the local symbols to be
6371 sure though; that case should simply be handled by the assembler. */
6373 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6376 child
->vtable_parent
= h
;
6381 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6384 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6385 bfd
*abfd ATTRIBUTE_UNUSED
;
6386 asection
*sec ATTRIBUTE_UNUSED
;
6387 struct elf_link_hash_entry
*h
;
6390 if (addend
>= h
->vtable_entries_size
)
6393 boolean
*ptr
= h
->vtable_entries_used
;
6395 /* While the symbol is undefined, we have to be prepared to handle
6397 if (h
->root
.type
== bfd_link_hash_undefined
)
6404 /* Oops! We've got a reference past the defined end of
6405 the table. This is probably a bug -- shall we warn? */
6410 /* Allocate one extra entry for use as a "done" flag for the
6411 consolidation pass. */
6412 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof(boolean
);
6418 ptr
= realloc (ptr
-1, bytes
);
6422 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof(boolean
);
6423 memset (((char *)ptr
) + oldbytes
, 0, bytes
- oldbytes
);
6427 ptr
= calloc (1, bytes
);
6432 /* And arrange for that done flag to be at index -1. */
6433 h
->vtable_entries_used
= ptr
+1;
6434 h
->vtable_entries_size
= size
;
6436 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6441 /* And an accompanying bit to work out final got entry offsets once
6442 we're done. Should be called from final_link. */
6445 elf_gc_common_finalize_got_offsets (abfd
, info
)
6447 struct bfd_link_info
*info
;
6450 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6453 /* The GOT offset is relative to the .got section, but the GOT header is
6454 put into the .got.plt section, if the backend uses it. */
6455 if (bed
->want_got_plt
)
6458 gotoff
= bed
->got_header_size
;
6460 /* Do the local .got entries first. */
6461 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6463 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6464 bfd_size_type j
, locsymcount
;
6465 Elf_Internal_Shdr
*symtab_hdr
;
6470 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6471 if (elf_bad_symtab (i
))
6472 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6474 locsymcount
= symtab_hdr
->sh_info
;
6476 for (j
= 0; j
< locsymcount
; ++j
)
6478 if (local_got
[j
] > 0)
6480 local_got
[j
] = gotoff
;
6481 gotoff
+= ARCH_SIZE
/ 8;
6484 local_got
[j
] = (bfd_vma
) -1;
6488 /* Then the global .got and .plt entries. */
6489 elf_link_hash_traverse (elf_hash_table (info
),
6490 elf_gc_allocate_got_offsets
,
6495 /* We need a special top-level link routine to convert got reference counts
6496 to real got offsets. */
6499 elf_gc_allocate_got_offsets (h
, offarg
)
6500 struct elf_link_hash_entry
*h
;
6503 bfd_vma
*off
= (bfd_vma
*) offarg
;
6505 if (h
->got
.refcount
> 0)
6507 h
->got
.offset
= off
[0];
6508 off
[0] += ARCH_SIZE
/ 8;
6511 h
->got
.offset
= (bfd_vma
) -1;
6516 /* Many folk need no more in the way of final link than this, once
6517 got entry reference counting is enabled. */
6520 elf_gc_common_final_link (abfd
, info
)
6522 struct bfd_link_info
*info
;
6524 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6527 /* Invoke the regular ELF backend linker to do all the work. */
6528 return elf_bfd_final_link (abfd
, info
);
6531 /* This function will be called though elf_link_hash_traverse to store
6532 all hash value of the exported symbols in an array. */
6535 elf_collect_hash_codes (h
, data
)
6536 struct elf_link_hash_entry
*h
;
6539 unsigned long **valuep
= (unsigned long **) data
;
6545 /* Ignore indirect symbols. These are added by the versioning code. */
6546 if (h
->dynindx
== -1)
6549 name
= h
->root
.root
.string
;
6550 p
= strchr (name
, ELF_VER_CHR
);
6553 alc
= bfd_malloc (p
- name
+ 1);
6554 memcpy (alc
, name
, p
- name
);
6555 alc
[p
- name
] = '\0';
6559 /* Compute the hash value. */
6560 ha
= bfd_elf_hash (name
);
6562 /* Store the found hash value in the array given as the argument. */
6565 /* And store it in the struct so that we can put it in the hash table
6567 h
->elf_hash_value
= ha
;