2 Copyright 1995, 1996, 1997, 1998, 1999, 2000 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
);
83 /* Return true iff this is a non-common definition of a symbol. */
85 is_global_symbol_definition (abfd
, sym
)
87 Elf_Internal_Sym
* sym
;
89 /* Local symbols do not count, but target specific ones might. */
90 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
91 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
94 /* If the section is undefined, then so is the symbol. */
95 if (sym
->st_shndx
== SHN_UNDEF
)
98 /* If the symbol is defined in the common section, then
99 it is a common definition and so does not count. */
100 if (sym
->st_shndx
== SHN_COMMON
)
103 /* If the symbol is in a target specific section then we
104 must rely upon the backend to tell us what it is. */
105 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
106 /* FIXME - this function is not coded yet:
108 return _bfd_is_global_symbol_definition (abfd, sym);
110 Instead for now assume that the definition is not global,
111 Even if this is wrong, at least the linker will behave
112 in the same way that it used to do. */
119 /* Search the symbol table of the archive element of the archive ABFD
120 whoes archove map contains a mention of SYMDEF, and determine if
121 the symbol is defined in this element. */
123 elf_link_is_defined_archive_symbol (abfd
, symdef
)
127 Elf_Internal_Shdr
* hdr
;
128 Elf_External_Sym
* esym
;
129 Elf_External_Sym
* esymend
;
130 Elf_External_Sym
* buf
= NULL
;
134 boolean result
= false;
136 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
137 if (abfd
== (bfd
*) NULL
)
140 if (! bfd_check_format (abfd
, bfd_object
))
143 /* If we have already included the element containing this symbol in the
144 link then we do not need to include it again. Just claim that any symbol
145 it contains is not a definition, so that our caller will not decide to
146 (re)include this element. */
147 if (abfd
->archive_pass
)
150 /* Select the appropriate symbol table. */
151 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
152 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
154 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
156 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
158 /* The sh_info field of the symtab header tells us where the
159 external symbols start. We don't care about the local symbols. */
160 if (elf_bad_symtab (abfd
))
162 extsymcount
= symcount
;
167 extsymcount
= symcount
- hdr
->sh_info
;
168 extsymoff
= hdr
->sh_info
;
171 buf
= ((Elf_External_Sym
*)
172 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
173 if (buf
== NULL
&& extsymcount
!= 0)
176 /* Read in the symbol table.
177 FIXME: This ought to be cached somewhere. */
179 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
181 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
182 != extsymcount
* sizeof (Elf_External_Sym
)))
188 /* Scan the symbol table looking for SYMDEF. */
189 esymend
= buf
+ extsymcount
;
194 Elf_Internal_Sym sym
;
197 elf_swap_symbol_in (abfd
, esym
, & sym
);
199 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
200 if (name
== (const char *) NULL
)
203 if (strcmp (name
, symdef
->name
) == 0)
205 result
= is_global_symbol_definition (abfd
, & sym
);
216 /* Add symbols from an ELF archive file to the linker hash table. We
217 don't use _bfd_generic_link_add_archive_symbols because of a
218 problem which arises on UnixWare. The UnixWare libc.so is an
219 archive which includes an entry libc.so.1 which defines a bunch of
220 symbols. The libc.so archive also includes a number of other
221 object files, which also define symbols, some of which are the same
222 as those defined in libc.so.1. Correct linking requires that we
223 consider each object file in turn, and include it if it defines any
224 symbols we need. _bfd_generic_link_add_archive_symbols does not do
225 this; it looks through the list of undefined symbols, and includes
226 any object file which defines them. When this algorithm is used on
227 UnixWare, it winds up pulling in libc.so.1 early and defining a
228 bunch of symbols. This means that some of the other objects in the
229 archive are not included in the link, which is incorrect since they
230 precede libc.so.1 in the archive.
232 Fortunately, ELF archive handling is simpler than that done by
233 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
234 oddities. In ELF, if we find a symbol in the archive map, and the
235 symbol is currently undefined, we know that we must pull in that
238 Unfortunately, we do have to make multiple passes over the symbol
239 table until nothing further is resolved. */
242 elf_link_add_archive_symbols (abfd
, info
)
244 struct bfd_link_info
*info
;
247 boolean
*defined
= NULL
;
248 boolean
*included
= NULL
;
252 if (! bfd_has_map (abfd
))
254 /* An empty archive is a special case. */
255 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
257 bfd_set_error (bfd_error_no_armap
);
261 /* Keep track of all symbols we know to be already defined, and all
262 files we know to be already included. This is to speed up the
263 second and subsequent passes. */
264 c
= bfd_ardata (abfd
)->symdef_count
;
267 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
268 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
269 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
271 memset (defined
, 0, c
* sizeof (boolean
));
272 memset (included
, 0, c
* sizeof (boolean
));
274 symdefs
= bfd_ardata (abfd
)->symdefs
;
287 symdefend
= symdef
+ c
;
288 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
290 struct elf_link_hash_entry
*h
;
292 struct bfd_link_hash_entry
*undefs_tail
;
295 if (defined
[i
] || included
[i
])
297 if (symdef
->file_offset
== last
)
303 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
304 false, false, false);
310 /* If this is a default version (the name contains @@),
311 look up the symbol again without the version. The
312 effect is that references to the symbol without the
313 version will be matched by the default symbol in the
316 p
= strchr (symdef
->name
, ELF_VER_CHR
);
317 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
320 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
323 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
324 copy
[p
- symdef
->name
] = '\0';
326 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
327 false, false, false);
329 bfd_release (abfd
, copy
);
335 if (h
->root
.type
== bfd_link_hash_common
)
337 /* We currently have a common symbol. The archive map contains
338 a reference to this symbol, so we may want to include it. We
339 only want to include it however, if this archive element
340 contains a definition of the symbol, not just another common
343 Unfortunately some archivers (including GNU ar) will put
344 declarations of common symbols into their archive maps, as
345 well as real definitions, so we cannot just go by the archive
346 map alone. Instead we must read in the element's symbol
347 table and check that to see what kind of symbol definition
349 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
352 else if (h
->root
.type
!= bfd_link_hash_undefined
)
354 if (h
->root
.type
!= bfd_link_hash_undefweak
)
359 /* We need to include this archive member. */
361 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
362 if (element
== (bfd
*) NULL
)
365 if (! bfd_check_format (element
, bfd_object
))
368 /* Doublecheck that we have not included this object
369 already--it should be impossible, but there may be
370 something wrong with the archive. */
371 if (element
->archive_pass
!= 0)
373 bfd_set_error (bfd_error_bad_value
);
376 element
->archive_pass
= 1;
378 undefs_tail
= info
->hash
->undefs_tail
;
380 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
383 if (! elf_link_add_object_symbols (element
, info
))
386 /* If there are any new undefined symbols, we need to make
387 another pass through the archive in order to see whether
388 they can be defined. FIXME: This isn't perfect, because
389 common symbols wind up on undefs_tail and because an
390 undefined symbol which is defined later on in this pass
391 does not require another pass. This isn't a bug, but it
392 does make the code less efficient than it could be. */
393 if (undefs_tail
!= info
->hash
->undefs_tail
)
396 /* Look backward to mark all symbols from this object file
397 which we have already seen in this pass. */
401 included
[mark
] = true;
406 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
408 /* We mark subsequent symbols from this object file as we go
409 on through the loop. */
410 last
= symdef
->file_offset
;
421 if (defined
!= (boolean
*) NULL
)
423 if (included
!= (boolean
*) NULL
)
428 /* This function is called when we want to define a new symbol. It
429 handles the various cases which arise when we find a definition in
430 a dynamic object, or when there is already a definition in a
431 dynamic object. The new symbol is described by NAME, SYM, PSEC,
432 and PVALUE. We set SYM_HASH to the hash table entry. We set
433 OVERRIDE if the old symbol is overriding a new definition. We set
434 TYPE_CHANGE_OK if it is OK for the type to change. We set
435 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
436 change, we mean that we shouldn't warn if the type or size does
440 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
441 override
, type_change_ok
, size_change_ok
)
443 struct bfd_link_info
*info
;
445 Elf_Internal_Sym
*sym
;
448 struct elf_link_hash_entry
**sym_hash
;
450 boolean
*type_change_ok
;
451 boolean
*size_change_ok
;
454 struct elf_link_hash_entry
*h
;
457 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
462 bind
= ELF_ST_BIND (sym
->st_info
);
464 if (! bfd_is_und_section (sec
))
465 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
467 h
= ((struct elf_link_hash_entry
*)
468 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
473 /* This code is for coping with dynamic objects, and is only useful
474 if we are doing an ELF link. */
475 if (info
->hash
->creator
!= abfd
->xvec
)
478 /* For merging, we only care about real symbols. */
480 while (h
->root
.type
== bfd_link_hash_indirect
481 || h
->root
.type
== bfd_link_hash_warning
)
482 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
484 /* If we just created the symbol, mark it as being an ELF symbol.
485 Other than that, there is nothing to do--there is no merge issue
486 with a newly defined symbol--so we just return. */
488 if (h
->root
.type
== bfd_link_hash_new
)
490 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
494 /* OLDBFD is a BFD associated with the existing symbol. */
496 switch (h
->root
.type
)
502 case bfd_link_hash_undefined
:
503 case bfd_link_hash_undefweak
:
504 oldbfd
= h
->root
.u
.undef
.abfd
;
507 case bfd_link_hash_defined
:
508 case bfd_link_hash_defweak
:
509 oldbfd
= h
->root
.u
.def
.section
->owner
;
512 case bfd_link_hash_common
:
513 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
517 /* In cases involving weak versioned symbols, we may wind up trying
518 to merge a symbol with itself. Catch that here, to avoid the
519 confusion that results if we try to override a symbol with
520 itself. The additional tests catch cases like
521 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
522 dynamic object, which we do want to handle here. */
524 && ((abfd
->flags
& DYNAMIC
) == 0
525 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
528 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
529 respectively, is from a dynamic object. */
531 if ((abfd
->flags
& DYNAMIC
) != 0)
537 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
542 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
543 indices used by MIPS ELF. */
544 switch (h
->root
.type
)
550 case bfd_link_hash_defined
:
551 case bfd_link_hash_defweak
:
552 hsec
= h
->root
.u
.def
.section
;
555 case bfd_link_hash_common
:
556 hsec
= h
->root
.u
.c
.p
->section
;
563 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
566 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
567 respectively, appear to be a definition rather than reference. */
569 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
574 if (h
->root
.type
== bfd_link_hash_undefined
575 || h
->root
.type
== bfd_link_hash_undefweak
576 || h
->root
.type
== bfd_link_hash_common
)
581 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
582 symbol, respectively, appears to be a common symbol in a dynamic
583 object. If a symbol appears in an uninitialized section, and is
584 not weak, and is not a function, then it may be a common symbol
585 which was resolved when the dynamic object was created. We want
586 to treat such symbols specially, because they raise special
587 considerations when setting the symbol size: if the symbol
588 appears as a common symbol in a regular object, and the size in
589 the regular object is larger, we must make sure that we use the
590 larger size. This problematic case can always be avoided in C,
591 but it must be handled correctly when using Fortran shared
594 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
595 likewise for OLDDYNCOMMON and OLDDEF.
597 Note that this test is just a heuristic, and that it is quite
598 possible to have an uninitialized symbol in a shared object which
599 is really a definition, rather than a common symbol. This could
600 lead to some minor confusion when the symbol really is a common
601 symbol in some regular object. However, I think it will be
606 && (sec
->flags
& SEC_ALLOC
) != 0
607 && (sec
->flags
& SEC_LOAD
) == 0
610 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
613 newdyncommon
= false;
617 && h
->root
.type
== bfd_link_hash_defined
618 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
619 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
620 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
622 && h
->type
!= STT_FUNC
)
625 olddyncommon
= false;
627 /* It's OK to change the type if either the existing symbol or the
628 new symbol is weak. */
630 if (h
->root
.type
== bfd_link_hash_defweak
631 || h
->root
.type
== bfd_link_hash_undefweak
633 *type_change_ok
= true;
635 /* It's OK to change the size if either the existing symbol or the
636 new symbol is weak, or if the old symbol is undefined. */
639 || h
->root
.type
== bfd_link_hash_undefined
)
640 *size_change_ok
= true;
642 /* If both the old and the new symbols look like common symbols in a
643 dynamic object, set the size of the symbol to the larger of the
648 && sym
->st_size
!= h
->size
)
650 /* Since we think we have two common symbols, issue a multiple
651 common warning if desired. Note that we only warn if the
652 size is different. If the size is the same, we simply let
653 the old symbol override the new one as normally happens with
654 symbols defined in dynamic objects. */
656 if (! ((*info
->callbacks
->multiple_common
)
657 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
658 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
661 if (sym
->st_size
> h
->size
)
662 h
->size
= sym
->st_size
;
664 *size_change_ok
= true;
667 /* If we are looking at a dynamic object, and we have found a
668 definition, we need to see if the symbol was already defined by
669 some other object. If so, we want to use the existing
670 definition, and we do not want to report a multiple symbol
671 definition error; we do this by clobbering *PSEC to be
674 We treat a common symbol as a definition if the symbol in the
675 shared library is a function, since common symbols always
676 represent variables; this can cause confusion in principle, but
677 any such confusion would seem to indicate an erroneous program or
678 shared library. We also permit a common symbol in a regular
679 object to override a weak symbol in a shared object.
681 We prefer a non-weak definition in a shared library to a weak
682 definition in the executable. */
687 || (h
->root
.type
== bfd_link_hash_common
689 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
690 && (h
->root
.type
!= bfd_link_hash_defweak
691 || bind
== STB_WEAK
))
695 newdyncommon
= false;
697 *psec
= sec
= bfd_und_section_ptr
;
698 *size_change_ok
= true;
700 /* If we get here when the old symbol is a common symbol, then
701 we are explicitly letting it override a weak symbol or
702 function in a dynamic object, and we don't want to warn about
703 a type change. If the old symbol is a defined symbol, a type
704 change warning may still be appropriate. */
706 if (h
->root
.type
== bfd_link_hash_common
)
707 *type_change_ok
= true;
710 /* Handle the special case of an old common symbol merging with a
711 new symbol which looks like a common symbol in a shared object.
712 We change *PSEC and *PVALUE to make the new symbol look like a
713 common symbol, and let _bfd_generic_link_add_one_symbol will do
717 && h
->root
.type
== bfd_link_hash_common
)
721 newdyncommon
= false;
722 *pvalue
= sym
->st_size
;
723 *psec
= sec
= bfd_com_section_ptr
;
724 *size_change_ok
= true;
727 /* If the old symbol is from a dynamic object, and the new symbol is
728 a definition which is not from a dynamic object, then the new
729 symbol overrides the old symbol. Symbols from regular files
730 always take precedence over symbols from dynamic objects, even if
731 they are defined after the dynamic object in the link.
733 As above, we again permit a common symbol in a regular object to
734 override a definition in a shared object if the shared object
735 symbol is a function or is weak.
737 As above, we permit a non-weak definition in a shared object to
738 override a weak definition in a regular object. */
742 || (bfd_is_com_section (sec
)
743 && (h
->root
.type
== bfd_link_hash_defweak
744 || h
->type
== STT_FUNC
)))
747 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
749 || h
->root
.type
== bfd_link_hash_defweak
))
751 /* Change the hash table entry to undefined, and let
752 _bfd_generic_link_add_one_symbol do the right thing with the
755 h
->root
.type
= bfd_link_hash_undefined
;
756 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
757 *size_change_ok
= true;
760 olddyncommon
= false;
762 /* We again permit a type change when a common symbol may be
763 overriding a function. */
765 if (bfd_is_com_section (sec
))
766 *type_change_ok
= true;
768 /* This union may have been set to be non-NULL when this symbol
769 was seen in a dynamic object. We must force the union to be
770 NULL, so that it is correct for a regular symbol. */
772 h
->verinfo
.vertree
= NULL
;
774 /* In this special case, if H is the target of an indirection,
775 we want the caller to frob with H rather than with the
776 indirect symbol. That will permit the caller to redefine the
777 target of the indirection, rather than the indirect symbol
778 itself. FIXME: This will break the -y option if we store a
779 symbol with a different name. */
783 /* Handle the special case of a new common symbol merging with an
784 old symbol that looks like it might be a common symbol defined in
785 a shared object. Note that we have already handled the case in
786 which a new common symbol should simply override the definition
787 in the shared library. */
790 && bfd_is_com_section (sec
)
793 /* It would be best if we could set the hash table entry to a
794 common symbol, but we don't know what to use for the section
796 if (! ((*info
->callbacks
->multiple_common
)
797 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
798 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
801 /* If the predumed common symbol in the dynamic object is
802 larger, pretend that the new symbol has its size. */
804 if (h
->size
> *pvalue
)
807 /* FIXME: We no longer know the alignment required by the symbol
808 in the dynamic object, so we just wind up using the one from
809 the regular object. */
812 olddyncommon
= false;
814 h
->root
.type
= bfd_link_hash_undefined
;
815 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
817 *size_change_ok
= true;
818 *type_change_ok
= true;
820 h
->verinfo
.vertree
= NULL
;
823 /* Handle the special case of a weak definition in a regular object
824 followed by a non-weak definition in a shared object. In this
825 case, we prefer the definition in the shared object. */
827 && h
->root
.type
== bfd_link_hash_defweak
832 /* To make this work we have to frob the flags so that the rest
833 of the code does not think we are using the regular
835 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
836 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
837 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
838 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
839 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
840 | ELF_LINK_HASH_DEF_DYNAMIC
);
842 /* If H is the target of an indirection, we want the caller to
843 use H rather than the indirect symbol. Otherwise if we are
844 defining a new indirect symbol we will wind up attaching it
845 to the entry we are overriding. */
849 /* Handle the special case of a non-weak definition in a shared
850 object followed by a weak definition in a regular object. In
851 this case we prefer to definition in the shared object. To make
852 this work we have to tell the caller to not treat the new symbol
856 && h
->root
.type
!= bfd_link_hash_defweak
865 /* Add symbols from an ELF object file to the linker hash table. */
868 elf_link_add_object_symbols (abfd
, info
)
870 struct bfd_link_info
*info
;
872 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
873 const Elf_Internal_Sym
*,
874 const char **, flagword
*,
875 asection
**, bfd_vma
*));
876 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
877 asection
*, const Elf_Internal_Rela
*));
879 Elf_Internal_Shdr
*hdr
;
883 Elf_External_Sym
*buf
= NULL
;
884 struct elf_link_hash_entry
**sym_hash
;
886 bfd_byte
*dynver
= NULL
;
887 Elf_External_Versym
*extversym
= NULL
;
888 Elf_External_Versym
*ever
;
889 Elf_External_Dyn
*dynbuf
= NULL
;
890 struct elf_link_hash_entry
*weaks
;
891 Elf_External_Sym
*esym
;
892 Elf_External_Sym
*esymend
;
893 struct elf_backend_data
*bed
;
895 bed
= get_elf_backend_data (abfd
);
896 add_symbol_hook
= bed
->elf_add_symbol_hook
;
897 collect
= bed
->collect
;
899 if ((abfd
->flags
& DYNAMIC
) == 0)
905 /* You can't use -r against a dynamic object. Also, there's no
906 hope of using a dynamic object which does not exactly match
907 the format of the output file. */
908 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
910 bfd_set_error (bfd_error_invalid_operation
);
915 /* As a GNU extension, any input sections which are named
916 .gnu.warning.SYMBOL are treated as warning symbols for the given
917 symbol. This differs from .gnu.warning sections, which generate
918 warnings when they are included in an output file. */
923 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
927 name
= bfd_get_section_name (abfd
, s
);
928 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
933 name
+= sizeof ".gnu.warning." - 1;
935 /* If this is a shared object, then look up the symbol
936 in the hash table. If it is there, and it is already
937 been defined, then we will not be using the entry
938 from this shared object, so we don't need to warn.
939 FIXME: If we see the definition in a regular object
940 later on, we will warn, but we shouldn't. The only
941 fix is to keep track of what warnings we are supposed
942 to emit, and then handle them all at the end of the
944 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
946 struct elf_link_hash_entry
*h
;
948 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
951 /* FIXME: What about bfd_link_hash_common? */
953 && (h
->root
.type
== bfd_link_hash_defined
954 || h
->root
.type
== bfd_link_hash_defweak
))
956 /* We don't want to issue this warning. Clobber
957 the section size so that the warning does not
958 get copied into the output file. */
964 sz
= bfd_section_size (abfd
, s
);
965 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
969 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
974 if (! (_bfd_generic_link_add_one_symbol
975 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
976 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
979 if (! info
->relocateable
)
981 /* Clobber the section size so that the warning does
982 not get copied into the output file. */
989 /* If this is a dynamic object, we always link against the .dynsym
990 symbol table, not the .symtab symbol table. The dynamic linker
991 will only see the .dynsym symbol table, so there is no reason to
992 look at .symtab for a dynamic object. */
994 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
995 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
997 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
1001 /* Read in any version definitions. */
1003 if (! _bfd_elf_slurp_version_tables (abfd
))
1006 /* Read in the symbol versions, but don't bother to convert them
1007 to internal format. */
1008 if (elf_dynversym (abfd
) != 0)
1010 Elf_Internal_Shdr
*versymhdr
;
1012 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
1013 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
1014 if (extversym
== NULL
)
1016 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
1017 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
1018 != versymhdr
->sh_size
))
1023 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
1025 /* The sh_info field of the symtab header tells us where the
1026 external symbols start. We don't care about the local symbols at
1028 if (elf_bad_symtab (abfd
))
1030 extsymcount
= symcount
;
1035 extsymcount
= symcount
- hdr
->sh_info
;
1036 extsymoff
= hdr
->sh_info
;
1039 buf
= ((Elf_External_Sym
*)
1040 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
1041 if (buf
== NULL
&& extsymcount
!= 0)
1044 /* We store a pointer to the hash table entry for each external
1046 sym_hash
= ((struct elf_link_hash_entry
**)
1048 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
1049 if (sym_hash
== NULL
)
1051 elf_sym_hashes (abfd
) = sym_hash
;
1055 /* If we are creating a shared library, create all the dynamic
1056 sections immediately. We need to attach them to something,
1057 so we attach them to this BFD, provided it is the right
1058 format. FIXME: If there are no input BFD's of the same
1059 format as the output, we can't make a shared library. */
1061 && ! elf_hash_table (info
)->dynamic_sections_created
1062 && abfd
->xvec
== info
->hash
->creator
)
1064 if (! elf_link_create_dynamic_sections (abfd
, info
))
1073 bfd_size_type oldsize
;
1074 bfd_size_type strindex
;
1076 /* Find the name to use in a DT_NEEDED entry that refers to this
1077 object. If the object has a DT_SONAME entry, we use it.
1078 Otherwise, if the generic linker stuck something in
1079 elf_dt_name, we use that. Otherwise, we just use the file
1080 name. If the generic linker put a null string into
1081 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1082 there is a DT_SONAME entry. */
1084 name
= bfd_get_filename (abfd
);
1085 if (elf_dt_name (abfd
) != NULL
)
1087 name
= elf_dt_name (abfd
);
1091 s
= bfd_get_section_by_name (abfd
, ".dynamic");
1094 Elf_External_Dyn
*extdyn
;
1095 Elf_External_Dyn
*extdynend
;
1099 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
1103 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
1104 (file_ptr
) 0, s
->_raw_size
))
1107 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1110 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1113 /* The shared libraries distributed with hpux11 have a bogus
1114 sh_link field for the ".dynamic" section. This code detects
1115 when LINK refers to a section that is not a string table and
1116 tries to find the string table for the ".dynsym" section
1118 Elf_Internal_Shdr
*hdr
= elf_elfsections (abfd
)[link
];
1119 if (hdr
->sh_type
!= SHT_STRTAB
)
1121 asection
*s
= bfd_get_section_by_name (abfd
, ".dynsym");
1122 int elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
1125 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
1130 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
1131 for (; extdyn
< extdynend
; extdyn
++)
1133 Elf_Internal_Dyn dyn
;
1135 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1136 if (dyn
.d_tag
== DT_SONAME
)
1138 name
= bfd_elf_string_from_elf_section (abfd
, link
,
1143 if (dyn
.d_tag
== DT_NEEDED
)
1145 struct bfd_link_needed_list
*n
, **pn
;
1148 n
= ((struct bfd_link_needed_list
*)
1149 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1150 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1152 if (n
== NULL
|| fnm
== NULL
)
1154 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1161 for (pn
= &elf_hash_table (info
)->needed
;
1173 /* We do not want to include any of the sections in a dynamic
1174 object in the output file. We hack by simply clobbering the
1175 list of sections in the BFD. This could be handled more
1176 cleanly by, say, a new section flag; the existing
1177 SEC_NEVER_LOAD flag is not the one we want, because that one
1178 still implies that the section takes up space in the output
1180 abfd
->sections
= NULL
;
1181 abfd
->section_count
= 0;
1183 /* If this is the first dynamic object found in the link, create
1184 the special sections required for dynamic linking. */
1185 if (! elf_hash_table (info
)->dynamic_sections_created
)
1187 if (! elf_link_create_dynamic_sections (abfd
, info
))
1193 /* Add a DT_NEEDED entry for this dynamic object. */
1194 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1195 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1197 if (strindex
== (bfd_size_type
) -1)
1200 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1203 Elf_External_Dyn
*dyncon
, *dynconend
;
1205 /* The hash table size did not change, which means that
1206 the dynamic object name was already entered. If we
1207 have already included this dynamic object in the
1208 link, just ignore it. There is no reason to include
1209 a particular dynamic object more than once. */
1210 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1212 BFD_ASSERT (sdyn
!= NULL
);
1214 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1215 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1217 for (; dyncon
< dynconend
; dyncon
++)
1219 Elf_Internal_Dyn dyn
;
1221 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1223 if (dyn
.d_tag
== DT_NEEDED
1224 && dyn
.d_un
.d_val
== strindex
)
1228 if (extversym
!= NULL
)
1235 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1239 /* Save the SONAME, if there is one, because sometimes the
1240 linker emulation code will need to know it. */
1242 name
= bfd_get_filename (abfd
);
1243 elf_dt_name (abfd
) = name
;
1247 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1249 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1250 != extsymcount
* sizeof (Elf_External_Sym
)))
1255 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1256 esymend
= buf
+ extsymcount
;
1259 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1261 Elf_Internal_Sym sym
;
1267 struct elf_link_hash_entry
*h
;
1269 boolean size_change_ok
, type_change_ok
;
1270 boolean new_weakdef
;
1271 unsigned int old_alignment
;
1273 elf_swap_symbol_in (abfd
, esym
, &sym
);
1275 flags
= BSF_NO_FLAGS
;
1277 value
= sym
.st_value
;
1280 bind
= ELF_ST_BIND (sym
.st_info
);
1281 if (bind
== STB_LOCAL
)
1283 /* This should be impossible, since ELF requires that all
1284 global symbols follow all local symbols, and that sh_info
1285 point to the first global symbol. Unfortunatealy, Irix 5
1289 else if (bind
== STB_GLOBAL
)
1291 if (sym
.st_shndx
!= SHN_UNDEF
1292 && sym
.st_shndx
!= SHN_COMMON
)
1297 else if (bind
== STB_WEAK
)
1301 /* Leave it up to the processor backend. */
1304 if (sym
.st_shndx
== SHN_UNDEF
)
1305 sec
= bfd_und_section_ptr
;
1306 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1308 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1310 sec
= bfd_abs_section_ptr
;
1311 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1314 else if (sym
.st_shndx
== SHN_ABS
)
1315 sec
= bfd_abs_section_ptr
;
1316 else if (sym
.st_shndx
== SHN_COMMON
)
1318 sec
= bfd_com_section_ptr
;
1319 /* What ELF calls the size we call the value. What ELF
1320 calls the value we call the alignment. */
1321 value
= sym
.st_size
;
1325 /* Leave it up to the processor backend. */
1328 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1329 if (name
== (const char *) NULL
)
1332 if (add_symbol_hook
)
1334 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1338 /* The hook function sets the name to NULL if this symbol
1339 should be skipped for some reason. */
1340 if (name
== (const char *) NULL
)
1344 /* Sanity check that all possibilities were handled. */
1345 if (sec
== (asection
*) NULL
)
1347 bfd_set_error (bfd_error_bad_value
);
1351 if (bfd_is_und_section (sec
)
1352 || bfd_is_com_section (sec
))
1357 size_change_ok
= false;
1358 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1360 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1362 Elf_Internal_Versym iver
;
1363 unsigned int vernum
= 0;
1368 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1369 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1371 /* If this is a hidden symbol, or if it is not version
1372 1, we append the version name to the symbol name.
1373 However, we do not modify a non-hidden absolute
1374 symbol, because it might be the version symbol
1375 itself. FIXME: What if it isn't? */
1376 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1377 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1380 int namelen
, newlen
;
1383 if (sym
.st_shndx
!= SHN_UNDEF
)
1385 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1387 (*_bfd_error_handler
)
1388 (_("%s: %s: invalid version %u (max %d)"),
1389 bfd_get_filename (abfd
), name
, vernum
,
1390 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1391 bfd_set_error (bfd_error_bad_value
);
1394 else if (vernum
> 1)
1396 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1402 /* We cannot simply test for the number of
1403 entries in the VERNEED section since the
1404 numbers for the needed versions do not start
1406 Elf_Internal_Verneed
*t
;
1409 for (t
= elf_tdata (abfd
)->verref
;
1413 Elf_Internal_Vernaux
*a
;
1415 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1417 if (a
->vna_other
== vernum
)
1419 verstr
= a
->vna_nodename
;
1428 (*_bfd_error_handler
)
1429 (_("%s: %s: invalid needed version %d"),
1430 bfd_get_filename (abfd
), name
, vernum
);
1431 bfd_set_error (bfd_error_bad_value
);
1436 namelen
= strlen (name
);
1437 newlen
= namelen
+ strlen (verstr
) + 2;
1438 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1441 newname
= (char *) bfd_alloc (abfd
, newlen
);
1442 if (newname
== NULL
)
1444 strcpy (newname
, name
);
1445 p
= newname
+ namelen
;
1447 /* If this is a defined non-hidden version symbol,
1448 we add another @ to the name. This indicates the
1449 default version of the symbol. */
1450 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
1451 && sym
.st_shndx
!= SHN_UNDEF
)
1459 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1460 sym_hash
, &override
, &type_change_ok
,
1468 while (h
->root
.type
== bfd_link_hash_indirect
1469 || h
->root
.type
== bfd_link_hash_warning
)
1470 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1472 /* Remember the old alignment if this is a common symbol, so
1473 that we don't reduce the alignment later on. We can't
1474 check later, because _bfd_generic_link_add_one_symbol
1475 will set a default for the alignment which we want to
1477 if (h
->root
.type
== bfd_link_hash_common
)
1478 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1480 if (elf_tdata (abfd
)->verdef
!= NULL
1484 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1487 if (! (_bfd_generic_link_add_one_symbol
1488 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1489 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1493 while (h
->root
.type
== bfd_link_hash_indirect
1494 || h
->root
.type
== bfd_link_hash_warning
)
1495 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1498 new_weakdef
= false;
1501 && (flags
& BSF_WEAK
) != 0
1502 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1503 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1504 && h
->weakdef
== NULL
)
1506 /* Keep a list of all weak defined non function symbols from
1507 a dynamic object, using the weakdef field. Later in this
1508 function we will set the weakdef field to the correct
1509 value. We only put non-function symbols from dynamic
1510 objects on this list, because that happens to be the only
1511 time we need to know the normal symbol corresponding to a
1512 weak symbol, and the information is time consuming to
1513 figure out. If the weakdef field is not already NULL,
1514 then this symbol was already defined by some previous
1515 dynamic object, and we will be using that previous
1516 definition anyhow. */
1523 /* Set the alignment of a common symbol. */
1524 if (sym
.st_shndx
== SHN_COMMON
1525 && h
->root
.type
== bfd_link_hash_common
)
1529 align
= bfd_log2 (sym
.st_value
);
1530 if (align
> old_alignment
)
1531 h
->root
.u
.c
.p
->alignment_power
= align
;
1534 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1540 /* Remember the symbol size and type. */
1541 if (sym
.st_size
!= 0
1542 && (definition
|| h
->size
== 0))
1544 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1545 (*_bfd_error_handler
)
1546 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1547 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1548 bfd_get_filename (abfd
));
1550 h
->size
= sym
.st_size
;
1553 /* If this is a common symbol, then we always want H->SIZE
1554 to be the size of the common symbol. The code just above
1555 won't fix the size if a common symbol becomes larger. We
1556 don't warn about a size change here, because that is
1557 covered by --warn-common. */
1558 if (h
->root
.type
== bfd_link_hash_common
)
1559 h
->size
= h
->root
.u
.c
.size
;
1561 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1562 && (definition
|| h
->type
== STT_NOTYPE
))
1564 if (h
->type
!= STT_NOTYPE
1565 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1566 && ! type_change_ok
)
1567 (*_bfd_error_handler
)
1568 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1569 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1570 bfd_get_filename (abfd
));
1572 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1575 /* If st_other has a processor-specific meaning, specific code
1576 might be needed here. */
1577 if (sym
.st_other
!= 0)
1579 /* Combine visibilities, using the most constraining one. */
1580 unsigned char hvis
= ELF_ST_VISIBILITY (h
->other
);
1581 unsigned char symvis
= ELF_ST_VISIBILITY (sym
.st_other
);
1583 if (symvis
&& (hvis
> symvis
|| hvis
== 0))
1584 h
->other
= sym
.st_other
;
1586 /* If neither has visibility, use the st_other of the
1587 definition. This is an arbitrary choice, since the
1588 other bits have no general meaning. */
1589 if (!symvis
&& !hvis
1590 && (definition
|| h
->other
== 0))
1591 h
->other
= sym
.st_other
;
1594 /* Set a flag in the hash table entry indicating the type of
1595 reference or definition we just found. Keep a count of
1596 the number of dynamic symbols we find. A dynamic symbol
1597 is one which is referenced or defined by both a regular
1598 object and a shared object. */
1599 old_flags
= h
->elf_link_hash_flags
;
1605 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1606 if (bind
!= STB_WEAK
)
1607 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1610 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1612 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1613 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1619 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1621 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1622 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1623 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1624 || (h
->weakdef
!= NULL
1626 && h
->weakdef
->dynindx
!= -1))
1630 h
->elf_link_hash_flags
|= new_flag
;
1632 /* If this symbol has a version, and it is the default
1633 version, we create an indirect symbol from the default
1634 name to the fully decorated name. This will cause
1635 external references which do not specify a version to be
1636 bound to this version of the symbol. */
1641 p
= strchr (name
, ELF_VER_CHR
);
1642 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1645 struct elf_link_hash_entry
*hi
;
1648 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1650 if (shortname
== NULL
)
1652 strncpy (shortname
, name
, p
- name
);
1653 shortname
[p
- name
] = '\0';
1655 /* We are going to create a new symbol. Merge it
1656 with any existing symbol with this name. For the
1657 purposes of the merge, act as though we were
1658 defining the symbol we just defined, although we
1659 actually going to define an indirect symbol. */
1660 type_change_ok
= false;
1661 size_change_ok
= false;
1662 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1663 &value
, &hi
, &override
,
1664 &type_change_ok
, &size_change_ok
))
1669 if (! (_bfd_generic_link_add_one_symbol
1670 (info
, abfd
, shortname
, BSF_INDIRECT
,
1671 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1672 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1677 /* In this case the symbol named SHORTNAME is
1678 overriding the indirect symbol we want to
1679 add. We were planning on making SHORTNAME an
1680 indirect symbol referring to NAME. SHORTNAME
1681 is the name without a version. NAME is the
1682 fully versioned name, and it is the default
1685 Overriding means that we already saw a
1686 definition for the symbol SHORTNAME in a
1687 regular object, and it is overriding the
1688 symbol defined in the dynamic object.
1690 When this happens, we actually want to change
1691 NAME, the symbol we just added, to refer to
1692 SHORTNAME. This will cause references to
1693 NAME in the shared object to become
1694 references to SHORTNAME in the regular
1695 object. This is what we expect when we
1696 override a function in a shared object: that
1697 the references in the shared object will be
1698 mapped to the definition in the regular
1701 while (hi
->root
.type
== bfd_link_hash_indirect
1702 || hi
->root
.type
== bfd_link_hash_warning
)
1703 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1705 h
->root
.type
= bfd_link_hash_indirect
;
1706 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1707 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1709 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1710 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1711 if (hi
->elf_link_hash_flags
1712 & (ELF_LINK_HASH_REF_REGULAR
1713 | ELF_LINK_HASH_DEF_REGULAR
))
1715 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1721 /* Now set HI to H, so that the following code
1722 will set the other fields correctly. */
1726 /* If there is a duplicate definition somewhere,
1727 then HI may not point to an indirect symbol. We
1728 will have reported an error to the user in that
1731 if (hi
->root
.type
== bfd_link_hash_indirect
)
1733 struct elf_link_hash_entry
*ht
;
1735 /* If the symbol became indirect, then we assume
1736 that we have not seen a definition before. */
1737 BFD_ASSERT ((hi
->elf_link_hash_flags
1738 & (ELF_LINK_HASH_DEF_DYNAMIC
1739 | ELF_LINK_HASH_DEF_REGULAR
))
1742 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1743 (*bed
->elf_backend_copy_indirect_symbol
) (ht
, hi
);
1745 /* See if the new flags lead us to realize that
1746 the symbol must be dynamic. */
1752 || ((hi
->elf_link_hash_flags
1753 & ELF_LINK_HASH_REF_DYNAMIC
)
1759 if ((hi
->elf_link_hash_flags
1760 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1766 /* We also need to define an indirection from the
1767 nondefault version of the symbol. */
1769 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1771 if (shortname
== NULL
)
1773 strncpy (shortname
, name
, p
- name
);
1774 strcpy (shortname
+ (p
- name
), p
+ 1);
1776 /* Once again, merge with any existing symbol. */
1777 type_change_ok
= false;
1778 size_change_ok
= false;
1779 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1780 &value
, &hi
, &override
,
1781 &type_change_ok
, &size_change_ok
))
1786 /* Here SHORTNAME is a versioned name, so we
1787 don't expect to see the type of override we
1788 do in the case above. */
1789 (*_bfd_error_handler
)
1790 (_("%s: warning: unexpected redefinition of `%s'"),
1791 bfd_get_filename (abfd
), shortname
);
1795 if (! (_bfd_generic_link_add_one_symbol
1796 (info
, abfd
, shortname
, BSF_INDIRECT
,
1797 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1798 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1801 /* If there is a duplicate definition somewhere,
1802 then HI may not point to an indirect symbol.
1803 We will have reported an error to the user in
1806 if (hi
->root
.type
== bfd_link_hash_indirect
)
1808 /* If the symbol became indirect, then we
1809 assume that we have not seen a definition
1811 BFD_ASSERT ((hi
->elf_link_hash_flags
1812 & (ELF_LINK_HASH_DEF_DYNAMIC
1813 | ELF_LINK_HASH_DEF_REGULAR
))
1816 (*bed
->elf_backend_copy_indirect_symbol
) (h
, hi
);
1818 /* See if the new flags lead us to realize
1819 that the symbol must be dynamic. */
1825 || ((hi
->elf_link_hash_flags
1826 & ELF_LINK_HASH_REF_DYNAMIC
)
1832 if ((hi
->elf_link_hash_flags
1833 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1842 if (dynsym
&& h
->dynindx
== -1)
1844 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1846 if (h
->weakdef
!= NULL
1848 && h
->weakdef
->dynindx
== -1)
1850 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1858 /* Now set the weakdefs field correctly for all the weak defined
1859 symbols we found. The only way to do this is to search all the
1860 symbols. Since we only need the information for non functions in
1861 dynamic objects, that's the only time we actually put anything on
1862 the list WEAKS. We need this information so that if a regular
1863 object refers to a symbol defined weakly in a dynamic object, the
1864 real symbol in the dynamic object is also put in the dynamic
1865 symbols; we also must arrange for both symbols to point to the
1866 same memory location. We could handle the general case of symbol
1867 aliasing, but a general symbol alias can only be generated in
1868 assembler code, handling it correctly would be very time
1869 consuming, and other ELF linkers don't handle general aliasing
1871 while (weaks
!= NULL
)
1873 struct elf_link_hash_entry
*hlook
;
1876 struct elf_link_hash_entry
**hpp
;
1877 struct elf_link_hash_entry
**hppend
;
1880 weaks
= hlook
->weakdef
;
1881 hlook
->weakdef
= NULL
;
1883 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1884 || hlook
->root
.type
== bfd_link_hash_defweak
1885 || hlook
->root
.type
== bfd_link_hash_common
1886 || hlook
->root
.type
== bfd_link_hash_indirect
);
1887 slook
= hlook
->root
.u
.def
.section
;
1888 vlook
= hlook
->root
.u
.def
.value
;
1890 hpp
= elf_sym_hashes (abfd
);
1891 hppend
= hpp
+ extsymcount
;
1892 for (; hpp
< hppend
; hpp
++)
1894 struct elf_link_hash_entry
*h
;
1897 if (h
!= NULL
&& h
!= hlook
1898 && h
->root
.type
== bfd_link_hash_defined
1899 && h
->root
.u
.def
.section
== slook
1900 && h
->root
.u
.def
.value
== vlook
)
1904 /* If the weak definition is in the list of dynamic
1905 symbols, make sure the real definition is put there
1907 if (hlook
->dynindx
!= -1
1908 && h
->dynindx
== -1)
1910 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1914 /* If the real definition is in the list of dynamic
1915 symbols, make sure the weak definition is put there
1916 as well. If we don't do this, then the dynamic
1917 loader might not merge the entries for the real
1918 definition and the weak definition. */
1919 if (h
->dynindx
!= -1
1920 && hlook
->dynindx
== -1)
1922 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1937 if (extversym
!= NULL
)
1943 /* If this object is the same format as the output object, and it is
1944 not a shared library, then let the backend look through the
1947 This is required to build global offset table entries and to
1948 arrange for dynamic relocs. It is not required for the
1949 particular common case of linking non PIC code, even when linking
1950 against shared libraries, but unfortunately there is no way of
1951 knowing whether an object file has been compiled PIC or not.
1952 Looking through the relocs is not particularly time consuming.
1953 The problem is that we must either (1) keep the relocs in memory,
1954 which causes the linker to require additional runtime memory or
1955 (2) read the relocs twice from the input file, which wastes time.
1956 This would be a good case for using mmap.
1958 I have no idea how to handle linking PIC code into a file of a
1959 different format. It probably can't be done. */
1960 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1962 && abfd
->xvec
== info
->hash
->creator
1963 && check_relocs
!= NULL
)
1967 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1969 Elf_Internal_Rela
*internal_relocs
;
1972 if ((o
->flags
& SEC_RELOC
) == 0
1973 || o
->reloc_count
== 0
1974 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1975 && (o
->flags
& SEC_DEBUGGING
) != 0)
1976 || bfd_is_abs_section (o
->output_section
))
1979 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1980 (abfd
, o
, (PTR
) NULL
,
1981 (Elf_Internal_Rela
*) NULL
,
1982 info
->keep_memory
));
1983 if (internal_relocs
== NULL
)
1986 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1988 if (! info
->keep_memory
)
1989 free (internal_relocs
);
1996 /* If this is a non-traditional, non-relocateable link, try to
1997 optimize the handling of the .stab/.stabstr sections. */
1999 && ! info
->relocateable
2000 && ! info
->traditional_format
2001 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
2002 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
2004 asection
*stab
, *stabstr
;
2006 stab
= bfd_get_section_by_name (abfd
, ".stab");
2009 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
2011 if (stabstr
!= NULL
)
2013 struct bfd_elf_section_data
*secdata
;
2015 secdata
= elf_section_data (stab
);
2016 if (! _bfd_link_section_stabs (abfd
,
2017 &elf_hash_table (info
)->stab_info
,
2019 &secdata
->stab_info
))
2034 if (extversym
!= NULL
)
2039 /* Create some sections which will be filled in with dynamic linking
2040 information. ABFD is an input file which requires dynamic sections
2041 to be created. The dynamic sections take up virtual memory space
2042 when the final executable is run, so we need to create them before
2043 addresses are assigned to the output sections. We work out the
2044 actual contents and size of these sections later. */
2047 elf_link_create_dynamic_sections (abfd
, info
)
2049 struct bfd_link_info
*info
;
2052 register asection
*s
;
2053 struct elf_link_hash_entry
*h
;
2054 struct elf_backend_data
*bed
;
2056 if (elf_hash_table (info
)->dynamic_sections_created
)
2059 /* Make sure that all dynamic sections use the same input BFD. */
2060 if (elf_hash_table (info
)->dynobj
== NULL
)
2061 elf_hash_table (info
)->dynobj
= abfd
;
2063 abfd
= elf_hash_table (info
)->dynobj
;
2065 /* Note that we set the SEC_IN_MEMORY flag for all of these
2067 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
2068 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2070 /* A dynamically linked executable has a .interp section, but a
2071 shared library does not. */
2074 s
= bfd_make_section (abfd
, ".interp");
2076 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2080 /* Create sections to hold version informations. These are removed
2081 if they are not needed. */
2082 s
= bfd_make_section (abfd
, ".gnu.version_d");
2084 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2085 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2088 s
= bfd_make_section (abfd
, ".gnu.version");
2090 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2091 || ! bfd_set_section_alignment (abfd
, s
, 1))
2094 s
= bfd_make_section (abfd
, ".gnu.version_r");
2096 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2097 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2100 s
= bfd_make_section (abfd
, ".dynsym");
2102 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2103 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2106 s
= bfd_make_section (abfd
, ".dynstr");
2108 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2111 /* Create a strtab to hold the dynamic symbol names. */
2112 if (elf_hash_table (info
)->dynstr
== NULL
)
2114 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
2115 if (elf_hash_table (info
)->dynstr
== NULL
)
2119 s
= bfd_make_section (abfd
, ".dynamic");
2121 || ! bfd_set_section_flags (abfd
, s
, flags
)
2122 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2125 /* The special symbol _DYNAMIC is always set to the start of the
2126 .dynamic section. This call occurs before we have processed the
2127 symbols for any dynamic object, so we don't have to worry about
2128 overriding a dynamic definition. We could set _DYNAMIC in a
2129 linker script, but we only want to define it if we are, in fact,
2130 creating a .dynamic section. We don't want to define it if there
2131 is no .dynamic section, since on some ELF platforms the start up
2132 code examines it to decide how to initialize the process. */
2134 if (! (_bfd_generic_link_add_one_symbol
2135 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2136 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2137 (struct bfd_link_hash_entry
**) &h
)))
2139 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2140 h
->type
= STT_OBJECT
;
2143 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2146 bed
= get_elf_backend_data (abfd
);
2148 s
= bfd_make_section (abfd
, ".hash");
2150 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2151 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2153 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2155 /* Let the backend create the rest of the sections. This lets the
2156 backend set the right flags. The backend will normally create
2157 the .got and .plt sections. */
2158 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2161 elf_hash_table (info
)->dynamic_sections_created
= true;
2166 /* Add an entry to the .dynamic table. */
2169 elf_add_dynamic_entry (info
, tag
, val
)
2170 struct bfd_link_info
*info
;
2174 Elf_Internal_Dyn dyn
;
2178 bfd_byte
*newcontents
;
2180 dynobj
= elf_hash_table (info
)->dynobj
;
2182 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2183 BFD_ASSERT (s
!= NULL
);
2185 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2186 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2187 if (newcontents
== NULL
)
2191 dyn
.d_un
.d_val
= val
;
2192 elf_swap_dyn_out (dynobj
, &dyn
,
2193 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2195 s
->_raw_size
= newsize
;
2196 s
->contents
= newcontents
;
2201 /* Record a new local dynamic symbol. */
2204 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2205 struct bfd_link_info
*info
;
2209 struct elf_link_local_dynamic_entry
*entry
;
2210 struct elf_link_hash_table
*eht
;
2211 struct bfd_strtab_hash
*dynstr
;
2212 Elf_External_Sym esym
;
2213 unsigned long dynstr_index
;
2216 /* See if the entry exists already. */
2217 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2218 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2221 entry
= (struct elf_link_local_dynamic_entry
*)
2222 bfd_alloc (input_bfd
, sizeof (*entry
));
2226 /* Go find the symbol, so that we can find it's name. */
2227 if (bfd_seek (input_bfd
,
2228 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2229 + input_indx
* sizeof (Elf_External_Sym
)),
2231 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2232 != sizeof (Elf_External_Sym
)))
2234 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2236 name
= (bfd_elf_string_from_elf_section
2237 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2238 entry
->isym
.st_name
));
2240 dynstr
= elf_hash_table (info
)->dynstr
;
2243 /* Create a strtab to hold the dynamic symbol names. */
2244 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2249 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2250 if (dynstr_index
== (unsigned long) -1)
2252 entry
->isym
.st_name
= dynstr_index
;
2254 eht
= elf_hash_table (info
);
2256 entry
->next
= eht
->dynlocal
;
2257 eht
->dynlocal
= entry
;
2258 entry
->input_bfd
= input_bfd
;
2259 entry
->input_indx
= input_indx
;
2262 /* Whatever binding the symbol had before, it's now local. */
2264 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2266 /* The dynindx will be set at the end of size_dynamic_sections. */
2272 /* Read and swap the relocs from the section indicated by SHDR. This
2273 may be either a REL or a RELA section. The relocations are
2274 translated into RELA relocations and stored in INTERNAL_RELOCS,
2275 which should have already been allocated to contain enough space.
2276 The EXTERNAL_RELOCS are a buffer where the external form of the
2277 relocations should be stored.
2279 Returns false if something goes wrong. */
2282 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2285 Elf_Internal_Shdr
*shdr
;
2286 PTR external_relocs
;
2287 Elf_Internal_Rela
*internal_relocs
;
2289 struct elf_backend_data
*bed
;
2291 /* If there aren't any relocations, that's OK. */
2295 /* Position ourselves at the start of the section. */
2296 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2299 /* Read the relocations. */
2300 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2304 bed
= get_elf_backend_data (abfd
);
2306 /* Convert the external relocations to the internal format. */
2307 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2309 Elf_External_Rel
*erel
;
2310 Elf_External_Rel
*erelend
;
2311 Elf_Internal_Rela
*irela
;
2312 Elf_Internal_Rel
*irel
;
2314 erel
= (Elf_External_Rel
*) external_relocs
;
2315 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2316 irela
= internal_relocs
;
2317 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2318 * sizeof (Elf_Internal_Rel
)));
2319 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2323 if (bed
->s
->swap_reloc_in
)
2324 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2326 elf_swap_reloc_in (abfd
, erel
, irel
);
2328 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2330 irela
[i
].r_offset
= irel
[i
].r_offset
;
2331 irela
[i
].r_info
= irel
[i
].r_info
;
2332 irela
[i
].r_addend
= 0;
2338 Elf_External_Rela
*erela
;
2339 Elf_External_Rela
*erelaend
;
2340 Elf_Internal_Rela
*irela
;
2342 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2344 erela
= (Elf_External_Rela
*) external_relocs
;
2345 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2346 irela
= internal_relocs
;
2347 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2349 if (bed
->s
->swap_reloca_in
)
2350 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2352 elf_swap_reloca_in (abfd
, erela
, irela
);
2359 /* Read and swap the relocs for a section O. They may have been
2360 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2361 not NULL, they are used as buffers to read into. They are known to
2362 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2363 the return value is allocated using either malloc or bfd_alloc,
2364 according to the KEEP_MEMORY argument. If O has two relocation
2365 sections (both REL and RELA relocations), then the REL_HDR
2366 relocations will appear first in INTERNAL_RELOCS, followed by the
2367 REL_HDR2 relocations. */
2370 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2374 PTR external_relocs
;
2375 Elf_Internal_Rela
*internal_relocs
;
2376 boolean keep_memory
;
2378 Elf_Internal_Shdr
*rel_hdr
;
2380 Elf_Internal_Rela
*alloc2
= NULL
;
2381 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2383 if (elf_section_data (o
)->relocs
!= NULL
)
2384 return elf_section_data (o
)->relocs
;
2386 if (o
->reloc_count
== 0)
2389 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2391 if (internal_relocs
== NULL
)
2395 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2396 * sizeof (Elf_Internal_Rela
));
2398 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2400 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2401 if (internal_relocs
== NULL
)
2405 if (external_relocs
== NULL
)
2407 size_t size
= (size_t) rel_hdr
->sh_size
;
2409 if (elf_section_data (o
)->rel_hdr2
)
2410 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2411 alloc1
= (PTR
) bfd_malloc (size
);
2414 external_relocs
= alloc1
;
2417 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2421 if (!elf_link_read_relocs_from_section
2423 elf_section_data (o
)->rel_hdr2
,
2424 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2425 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2426 * bed
->s
->int_rels_per_ext_rel
)))
2429 /* Cache the results for next time, if we can. */
2431 elf_section_data (o
)->relocs
= internal_relocs
;
2436 /* Don't free alloc2, since if it was allocated we are passing it
2437 back (under the name of internal_relocs). */
2439 return internal_relocs
;
2450 /* Record an assignment to a symbol made by a linker script. We need
2451 this in case some dynamic object refers to this symbol. */
2455 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2456 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2457 struct bfd_link_info
*info
;
2461 struct elf_link_hash_entry
*h
;
2463 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2466 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2470 if (h
->root
.type
== bfd_link_hash_new
)
2471 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2473 /* If this symbol is being provided by the linker script, and it is
2474 currently defined by a dynamic object, but not by a regular
2475 object, then mark it as undefined so that the generic linker will
2476 force the correct value. */
2478 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2479 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2480 h
->root
.type
= bfd_link_hash_undefined
;
2482 /* If this symbol is not being provided by the linker script, and it is
2483 currently defined by a dynamic object, but not by a regular object,
2484 then clear out any version information because the symbol will not be
2485 associated with the dynamic object any more. */
2487 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2488 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2489 h
->verinfo
.verdef
= NULL
;
2491 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2493 /* When possible, keep the original type of the symbol */
2494 if (h
->type
== STT_NOTYPE
)
2495 h
->type
= STT_OBJECT
;
2497 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2498 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2500 && h
->dynindx
== -1)
2502 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2505 /* If this is a weak defined symbol, and we know a corresponding
2506 real symbol from the same dynamic object, make sure the real
2507 symbol is also made into a dynamic symbol. */
2508 if (h
->weakdef
!= NULL
2509 && h
->weakdef
->dynindx
== -1)
2511 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2519 /* This structure is used to pass information to
2520 elf_link_assign_sym_version. */
2522 struct elf_assign_sym_version_info
2526 /* General link information. */
2527 struct bfd_link_info
*info
;
2529 struct bfd_elf_version_tree
*verdefs
;
2530 /* Whether we are exporting all dynamic symbols. */
2531 boolean export_dynamic
;
2532 /* Whether we had a failure. */
2536 /* This structure is used to pass information to
2537 elf_link_find_version_dependencies. */
2539 struct elf_find_verdep_info
2543 /* General link information. */
2544 struct bfd_link_info
*info
;
2545 /* The number of dependencies. */
2547 /* Whether we had a failure. */
2551 /* Array used to determine the number of hash table buckets to use
2552 based on the number of symbols there are. If there are fewer than
2553 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2554 fewer than 37 we use 17 buckets, and so forth. We never use more
2555 than 32771 buckets. */
2557 static const size_t elf_buckets
[] =
2559 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2563 /* Compute bucket count for hashing table. We do not use a static set
2564 of possible tables sizes anymore. Instead we determine for all
2565 possible reasonable sizes of the table the outcome (i.e., the
2566 number of collisions etc) and choose the best solution. The
2567 weighting functions are not too simple to allow the table to grow
2568 without bounds. Instead one of the weighting factors is the size.
2569 Therefore the result is always a good payoff between few collisions
2570 (= short chain lengths) and table size. */
2572 compute_bucket_count (info
)
2573 struct bfd_link_info
*info
;
2575 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2576 size_t best_size
= 0;
2577 unsigned long int *hashcodes
;
2578 unsigned long int *hashcodesp
;
2579 unsigned long int i
;
2581 /* Compute the hash values for all exported symbols. At the same
2582 time store the values in an array so that we could use them for
2584 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2585 * sizeof (unsigned long int));
2586 if (hashcodes
== NULL
)
2588 hashcodesp
= hashcodes
;
2590 /* Put all hash values in HASHCODES. */
2591 elf_link_hash_traverse (elf_hash_table (info
),
2592 elf_collect_hash_codes
, &hashcodesp
);
2594 /* We have a problem here. The following code to optimize the table
2595 size requires an integer type with more the 32 bits. If
2596 BFD_HOST_U_64_BIT is set we know about such a type. */
2597 #ifdef BFD_HOST_U_64_BIT
2598 if (info
->optimize
== true)
2600 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2603 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2604 unsigned long int *counts
;
2606 /* Possible optimization parameters: if we have NSYMS symbols we say
2607 that the hashing table must at least have NSYMS/4 and at most
2609 minsize
= nsyms
/ 4;
2612 best_size
= maxsize
= nsyms
* 2;
2614 /* Create array where we count the collisions in. We must use bfd_malloc
2615 since the size could be large. */
2616 counts
= (unsigned long int *) bfd_malloc (maxsize
2617 * sizeof (unsigned long int));
2624 /* Compute the "optimal" size for the hash table. The criteria is a
2625 minimal chain length. The minor criteria is (of course) the size
2627 for (i
= minsize
; i
< maxsize
; ++i
)
2629 /* Walk through the array of hashcodes and count the collisions. */
2630 BFD_HOST_U_64_BIT max
;
2631 unsigned long int j
;
2632 unsigned long int fact
;
2634 memset (counts
, '\0', i
* sizeof (unsigned long int));
2636 /* Determine how often each hash bucket is used. */
2637 for (j
= 0; j
< nsyms
; ++j
)
2638 ++counts
[hashcodes
[j
] % i
];
2640 /* For the weight function we need some information about the
2641 pagesize on the target. This is information need not be 100%
2642 accurate. Since this information is not available (so far) we
2643 define it here to a reasonable default value. If it is crucial
2644 to have a better value some day simply define this value. */
2645 # ifndef BFD_TARGET_PAGESIZE
2646 # define BFD_TARGET_PAGESIZE (4096)
2649 /* We in any case need 2 + NSYMS entries for the size values and
2651 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2654 /* Variant 1: optimize for short chains. We add the squares
2655 of all the chain lengths (which favous many small chain
2656 over a few long chains). */
2657 for (j
= 0; j
< i
; ++j
)
2658 max
+= counts
[j
] * counts
[j
];
2660 /* This adds penalties for the overall size of the table. */
2661 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2664 /* Variant 2: Optimize a lot more for small table. Here we
2665 also add squares of the size but we also add penalties for
2666 empty slots (the +1 term). */
2667 for (j
= 0; j
< i
; ++j
)
2668 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2670 /* The overall size of the table is considered, but not as
2671 strong as in variant 1, where it is squared. */
2672 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2676 /* Compare with current best results. */
2677 if (max
< best_chlen
)
2687 #endif /* defined (BFD_HOST_U_64_BIT) */
2689 /* This is the fallback solution if no 64bit type is available or if we
2690 are not supposed to spend much time on optimizations. We select the
2691 bucket count using a fixed set of numbers. */
2692 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2694 best_size
= elf_buckets
[i
];
2695 if (dynsymcount
< elf_buckets
[i
+ 1])
2700 /* Free the arrays we needed. */
2706 /* Set up the sizes and contents of the ELF dynamic sections. This is
2707 called by the ELF linker emulation before_allocation routine. We
2708 must set the sizes of the sections before the linker sets the
2709 addresses of the various sections. */
2712 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2713 export_dynamic
, filter_shlib
,
2714 auxiliary_filters
, info
, sinterpptr
,
2719 boolean export_dynamic
;
2720 const char *filter_shlib
;
2721 const char * const *auxiliary_filters
;
2722 struct bfd_link_info
*info
;
2723 asection
**sinterpptr
;
2724 struct bfd_elf_version_tree
*verdefs
;
2726 bfd_size_type soname_indx
;
2728 struct elf_backend_data
*bed
;
2729 struct elf_assign_sym_version_info asvinfo
;
2733 soname_indx
= (bfd_size_type
) -1;
2735 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2738 /* The backend may have to create some sections regardless of whether
2739 we're dynamic or not. */
2740 bed
= get_elf_backend_data (output_bfd
);
2741 if (bed
->elf_backend_always_size_sections
2742 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2745 dynobj
= elf_hash_table (info
)->dynobj
;
2747 /* If there were no dynamic objects in the link, there is nothing to
2752 if (elf_hash_table (info
)->dynamic_sections_created
)
2754 struct elf_info_failed eif
;
2755 struct elf_link_hash_entry
*h
;
2756 bfd_size_type strsize
;
2758 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2759 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2763 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2764 soname
, true, true);
2765 if (soname_indx
== (bfd_size_type
) -1
2766 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2772 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2780 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2782 if (indx
== (bfd_size_type
) -1
2783 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2787 if (filter_shlib
!= NULL
)
2791 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2792 filter_shlib
, true, true);
2793 if (indx
== (bfd_size_type
) -1
2794 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2798 if (auxiliary_filters
!= NULL
)
2800 const char * const *p
;
2802 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2806 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2808 if (indx
== (bfd_size_type
) -1
2809 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2814 /* If we are supposed to export all symbols into the dynamic symbol
2815 table (this is not the normal case), then do so. */
2818 struct elf_info_failed eif
;
2822 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2828 /* Attach all the symbols to their version information. */
2829 asvinfo
.output_bfd
= output_bfd
;
2830 asvinfo
.info
= info
;
2831 asvinfo
.verdefs
= verdefs
;
2832 asvinfo
.export_dynamic
= export_dynamic
;
2833 asvinfo
.failed
= false;
2835 elf_link_hash_traverse (elf_hash_table (info
),
2836 elf_link_assign_sym_version
,
2841 /* Find all symbols which were defined in a dynamic object and make
2842 the backend pick a reasonable value for them. */
2845 elf_link_hash_traverse (elf_hash_table (info
),
2846 elf_adjust_dynamic_symbol
,
2851 /* Add some entries to the .dynamic section. We fill in some of the
2852 values later, in elf_bfd_final_link, but we must add the entries
2853 now so that we know the final size of the .dynamic section. */
2855 /* If there are initialization and/or finalization functions to
2856 call then add the corresponding DT_INIT/DT_FINI entries. */
2857 h
= (info
->init_function
2858 ? elf_link_hash_lookup (elf_hash_table (info
),
2859 info
->init_function
, false,
2863 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2864 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2866 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2869 h
= (info
->fini_function
2870 ? elf_link_hash_lookup (elf_hash_table (info
),
2871 info
->fini_function
, false,
2875 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2876 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2878 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2882 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2883 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2884 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2885 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2886 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2887 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2888 sizeof (Elf_External_Sym
)))
2892 /* The backend must work out the sizes of all the other dynamic
2894 if (bed
->elf_backend_size_dynamic_sections
2895 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2898 if (elf_hash_table (info
)->dynamic_sections_created
)
2902 size_t bucketcount
= 0;
2903 Elf_Internal_Sym isym
;
2904 size_t hash_entry_size
;
2906 /* Set up the version definition section. */
2907 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2908 BFD_ASSERT (s
!= NULL
);
2910 /* We may have created additional version definitions if we are
2911 just linking a regular application. */
2912 verdefs
= asvinfo
.verdefs
;
2914 if (verdefs
== NULL
)
2915 _bfd_strip_section_from_output (info
, s
);
2920 struct bfd_elf_version_tree
*t
;
2922 Elf_Internal_Verdef def
;
2923 Elf_Internal_Verdaux defaux
;
2928 /* Make space for the base version. */
2929 size
+= sizeof (Elf_External_Verdef
);
2930 size
+= sizeof (Elf_External_Verdaux
);
2933 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2935 struct bfd_elf_version_deps
*n
;
2937 size
+= sizeof (Elf_External_Verdef
);
2938 size
+= sizeof (Elf_External_Verdaux
);
2941 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2942 size
+= sizeof (Elf_External_Verdaux
);
2945 s
->_raw_size
= size
;
2946 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2947 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2950 /* Fill in the version definition section. */
2954 def
.vd_version
= VER_DEF_CURRENT
;
2955 def
.vd_flags
= VER_FLG_BASE
;
2958 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2959 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2960 + sizeof (Elf_External_Verdaux
));
2962 if (soname_indx
!= (bfd_size_type
) -1)
2964 def
.vd_hash
= bfd_elf_hash (soname
);
2965 defaux
.vda_name
= soname_indx
;
2972 name
= output_bfd
->filename
;
2973 def
.vd_hash
= bfd_elf_hash (name
);
2974 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2976 if (indx
== (bfd_size_type
) -1)
2978 defaux
.vda_name
= indx
;
2980 defaux
.vda_next
= 0;
2982 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2983 (Elf_External_Verdef
*)p
);
2984 p
+= sizeof (Elf_External_Verdef
);
2985 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2986 (Elf_External_Verdaux
*) p
);
2987 p
+= sizeof (Elf_External_Verdaux
);
2989 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2992 struct bfd_elf_version_deps
*n
;
2993 struct elf_link_hash_entry
*h
;
2996 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2999 /* Add a symbol representing this version. */
3001 if (! (_bfd_generic_link_add_one_symbol
3002 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
3003 (bfd_vma
) 0, (const char *) NULL
, false,
3004 get_elf_backend_data (dynobj
)->collect
,
3005 (struct bfd_link_hash_entry
**) &h
)))
3007 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
3008 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3009 h
->type
= STT_OBJECT
;
3010 h
->verinfo
.vertree
= t
;
3012 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
3015 def
.vd_version
= VER_DEF_CURRENT
;
3017 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
3018 def
.vd_flags
|= VER_FLG_WEAK
;
3019 def
.vd_ndx
= t
->vernum
+ 1;
3020 def
.vd_cnt
= cdeps
+ 1;
3021 def
.vd_hash
= bfd_elf_hash (t
->name
);
3022 def
.vd_aux
= sizeof (Elf_External_Verdef
);
3023 if (t
->next
!= NULL
)
3024 def
.vd_next
= (sizeof (Elf_External_Verdef
)
3025 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
3029 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
3030 (Elf_External_Verdef
*) p
);
3031 p
+= sizeof (Elf_External_Verdef
);
3033 defaux
.vda_name
= h
->dynstr_index
;
3034 if (t
->deps
== NULL
)
3035 defaux
.vda_next
= 0;
3037 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3038 t
->name_indx
= defaux
.vda_name
;
3040 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3041 (Elf_External_Verdaux
*) p
);
3042 p
+= sizeof (Elf_External_Verdaux
);
3044 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
3046 if (n
->version_needed
== NULL
)
3048 /* This can happen if there was an error in the
3050 defaux
.vda_name
= 0;
3053 defaux
.vda_name
= n
->version_needed
->name_indx
;
3054 if (n
->next
== NULL
)
3055 defaux
.vda_next
= 0;
3057 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
3059 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
3060 (Elf_External_Verdaux
*) p
);
3061 p
+= sizeof (Elf_External_Verdaux
);
3065 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
3066 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
3069 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
3072 /* Work out the size of the version reference section. */
3074 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3075 BFD_ASSERT (s
!= NULL
);
3077 struct elf_find_verdep_info sinfo
;
3079 sinfo
.output_bfd
= output_bfd
;
3081 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3082 if (sinfo
.vers
== 0)
3084 sinfo
.failed
= false;
3086 elf_link_hash_traverse (elf_hash_table (info
),
3087 elf_link_find_version_dependencies
,
3090 if (elf_tdata (output_bfd
)->verref
== NULL
)
3091 _bfd_strip_section_from_output (info
, s
);
3094 Elf_Internal_Verneed
*t
;
3099 /* Build the version definition section. */
3102 for (t
= elf_tdata (output_bfd
)->verref
;
3106 Elf_Internal_Vernaux
*a
;
3108 size
+= sizeof (Elf_External_Verneed
);
3110 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3111 size
+= sizeof (Elf_External_Vernaux
);
3114 s
->_raw_size
= size
;
3115 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
3116 if (s
->contents
== NULL
)
3120 for (t
= elf_tdata (output_bfd
)->verref
;
3125 Elf_Internal_Vernaux
*a
;
3129 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3132 t
->vn_version
= VER_NEED_CURRENT
;
3134 if (elf_dt_name (t
->vn_bfd
) != NULL
)
3135 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3136 elf_dt_name (t
->vn_bfd
),
3139 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3140 t
->vn_bfd
->filename
, true, false);
3141 if (indx
== (bfd_size_type
) -1)
3144 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3145 if (t
->vn_nextref
== NULL
)
3148 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3149 + caux
* sizeof (Elf_External_Vernaux
));
3151 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3152 (Elf_External_Verneed
*) p
);
3153 p
+= sizeof (Elf_External_Verneed
);
3155 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3157 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3158 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3159 a
->vna_nodename
, true, false);
3160 if (indx
== (bfd_size_type
) -1)
3163 if (a
->vna_nextptr
== NULL
)
3166 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3168 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3169 (Elf_External_Vernaux
*) p
);
3170 p
+= sizeof (Elf_External_Vernaux
);
3174 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3175 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3178 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3182 /* Assign dynsym indicies. In a shared library we generate a
3183 section symbol for each output section, which come first.
3184 Next come all of the back-end allocated local dynamic syms,
3185 followed by the rest of the global symbols. */
3187 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3189 /* Work out the size of the symbol version section. */
3190 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3191 BFD_ASSERT (s
!= NULL
);
3192 if (dynsymcount
== 0
3193 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3195 _bfd_strip_section_from_output (info
, s
);
3196 /* The DYNSYMCOUNT might have changed if we were going to
3197 output a dynamic symbol table entry for S. */
3198 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3202 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3203 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3204 if (s
->contents
== NULL
)
3207 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3211 /* Set the size of the .dynsym and .hash sections. We counted
3212 the number of dynamic symbols in elf_link_add_object_symbols.
3213 We will build the contents of .dynsym and .hash when we build
3214 the final symbol table, because until then we do not know the
3215 correct value to give the symbols. We built the .dynstr
3216 section as we went along in elf_link_add_object_symbols. */
3217 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3218 BFD_ASSERT (s
!= NULL
);
3219 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3220 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3221 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3224 /* The first entry in .dynsym is a dummy symbol. */
3231 elf_swap_symbol_out (output_bfd
, &isym
,
3232 (PTR
) (Elf_External_Sym
*) s
->contents
);
3234 /* Compute the size of the hashing table. As a side effect this
3235 computes the hash values for all the names we export. */
3236 bucketcount
= compute_bucket_count (info
);
3238 s
= bfd_get_section_by_name (dynobj
, ".hash");
3239 BFD_ASSERT (s
!= NULL
);
3240 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3241 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3242 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3243 if (s
->contents
== NULL
)
3245 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3247 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3248 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3249 s
->contents
+ hash_entry_size
);
3251 elf_hash_table (info
)->bucketcount
= bucketcount
;
3253 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3254 BFD_ASSERT (s
!= NULL
);
3255 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3257 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3264 /* Fix up the flags for a symbol. This handles various cases which
3265 can only be fixed after all the input files are seen. This is
3266 currently called by both adjust_dynamic_symbol and
3267 assign_sym_version, which is unnecessary but perhaps more robust in
3268 the face of future changes. */
3271 elf_fix_symbol_flags (h
, eif
)
3272 struct elf_link_hash_entry
*h
;
3273 struct elf_info_failed
*eif
;
3275 /* If this symbol was mentioned in a non-ELF file, try to set
3276 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3277 permit a non-ELF file to correctly refer to a symbol defined in
3278 an ELF dynamic object. */
3279 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3281 if (h
->root
.type
!= bfd_link_hash_defined
3282 && h
->root
.type
!= bfd_link_hash_defweak
)
3283 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3284 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3287 if (h
->root
.u
.def
.section
->owner
!= NULL
3288 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3289 == bfd_target_elf_flavour
))
3290 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3291 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3293 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3296 if (h
->dynindx
== -1
3297 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3298 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3300 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3309 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3310 was first seen in a non-ELF file. Fortunately, if the symbol
3311 was first seen in an ELF file, we're probably OK unless the
3312 symbol was defined in a non-ELF file. Catch that case here.
3313 FIXME: We're still in trouble if the symbol was first seen in
3314 a dynamic object, and then later in a non-ELF regular object. */
3315 if ((h
->root
.type
== bfd_link_hash_defined
3316 || h
->root
.type
== bfd_link_hash_defweak
)
3317 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3318 && (h
->root
.u
.def
.section
->owner
!= NULL
3319 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3320 != bfd_target_elf_flavour
)
3321 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3322 && (h
->elf_link_hash_flags
3323 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3324 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3327 /* If this is a final link, and the symbol was defined as a common
3328 symbol in a regular object file, and there was no definition in
3329 any dynamic object, then the linker will have allocated space for
3330 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3331 flag will not have been set. */
3332 if (h
->root
.type
== bfd_link_hash_defined
3333 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3334 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3335 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3336 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3337 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3339 /* If -Bsymbolic was used (which means to bind references to global
3340 symbols to the definition within the shared object), and this
3341 symbol was defined in a regular object, then it actually doesn't
3342 need a PLT entry. */
3343 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3344 && eif
->info
->shared
3345 && eif
->info
->symbolic
3346 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3348 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3349 h
->plt
.offset
= (bfd_vma
) -1;
3352 /* If this is a weak defined symbol in a dynamic object, and we know
3353 the real definition in the dynamic object, copy interesting flags
3354 over to the real definition. */
3355 if (h
->weakdef
!= NULL
)
3357 struct elf_link_hash_entry
*weakdef
;
3359 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3360 || h
->root
.type
== bfd_link_hash_defweak
);
3361 weakdef
= h
->weakdef
;
3362 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3363 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3364 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3366 /* If the real definition is defined by a regular object file,
3367 don't do anything special. See the longer description in
3368 elf_adjust_dynamic_symbol, below. */
3369 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3372 weakdef
->elf_link_hash_flags
|=
3373 (h
->elf_link_hash_flags
3374 & (ELF_LINK_HASH_REF_REGULAR
3375 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3376 | ELF_LINK_NON_GOT_REF
));
3382 /* Make the backend pick a good value for a dynamic symbol. This is
3383 called via elf_link_hash_traverse, and also calls itself
3387 elf_adjust_dynamic_symbol (h
, data
)
3388 struct elf_link_hash_entry
*h
;
3391 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3393 struct elf_backend_data
*bed
;
3395 /* Ignore indirect symbols. These are added by the versioning code. */
3396 if (h
->root
.type
== bfd_link_hash_indirect
)
3399 /* Fix the symbol flags. */
3400 if (! elf_fix_symbol_flags (h
, eif
))
3403 /* If this symbol does not require a PLT entry, and it is not
3404 defined by a dynamic object, or is not referenced by a regular
3405 object, ignore it. We do have to handle a weak defined symbol,
3406 even if no regular object refers to it, if we decided to add it
3407 to the dynamic symbol table. FIXME: Do we normally need to worry
3408 about symbols which are defined by one dynamic object and
3409 referenced by another one? */
3410 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3411 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3412 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3413 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3414 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3416 h
->plt
.offset
= (bfd_vma
) -1;
3420 /* If we've already adjusted this symbol, don't do it again. This
3421 can happen via a recursive call. */
3422 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3425 /* Don't look at this symbol again. Note that we must set this
3426 after checking the above conditions, because we may look at a
3427 symbol once, decide not to do anything, and then get called
3428 recursively later after REF_REGULAR is set below. */
3429 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3431 /* If this is a weak definition, and we know a real definition, and
3432 the real symbol is not itself defined by a regular object file,
3433 then get a good value for the real definition. We handle the
3434 real symbol first, for the convenience of the backend routine.
3436 Note that there is a confusing case here. If the real definition
3437 is defined by a regular object file, we don't get the real symbol
3438 from the dynamic object, but we do get the weak symbol. If the
3439 processor backend uses a COPY reloc, then if some routine in the
3440 dynamic object changes the real symbol, we will not see that
3441 change in the corresponding weak symbol. This is the way other
3442 ELF linkers work as well, and seems to be a result of the shared
3445 I will clarify this issue. Most SVR4 shared libraries define the
3446 variable _timezone and define timezone as a weak synonym. The
3447 tzset call changes _timezone. If you write
3448 extern int timezone;
3450 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3451 you might expect that, since timezone is a synonym for _timezone,
3452 the same number will print both times. However, if the processor
3453 backend uses a COPY reloc, then actually timezone will be copied
3454 into your process image, and, since you define _timezone
3455 yourself, _timezone will not. Thus timezone and _timezone will
3456 wind up at different memory locations. The tzset call will set
3457 _timezone, leaving timezone unchanged. */
3459 if (h
->weakdef
!= NULL
)
3461 /* If we get to this point, we know there is an implicit
3462 reference by a regular object file via the weak symbol H.
3463 FIXME: Is this really true? What if the traversal finds
3464 H->WEAKDEF before it finds H? */
3465 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3467 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
3471 /* If a symbol has no type and no size and does not require a PLT
3472 entry, then we are probably about to do the wrong thing here: we
3473 are probably going to create a COPY reloc for an empty object.
3474 This case can arise when a shared object is built with assembly
3475 code, and the assembly code fails to set the symbol type. */
3477 && h
->type
== STT_NOTYPE
3478 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3479 (*_bfd_error_handler
)
3480 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3481 h
->root
.root
.string
);
3483 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3484 bed
= get_elf_backend_data (dynobj
);
3485 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3494 /* This routine is used to export all defined symbols into the dynamic
3495 symbol table. It is called via elf_link_hash_traverse. */
3498 elf_export_symbol (h
, data
)
3499 struct elf_link_hash_entry
*h
;
3502 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3504 /* Ignore indirect symbols. These are added by the versioning code. */
3505 if (h
->root
.type
== bfd_link_hash_indirect
)
3508 if (h
->dynindx
== -1
3509 && (h
->elf_link_hash_flags
3510 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3512 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3522 /* Look through the symbols which are defined in other shared
3523 libraries and referenced here. Update the list of version
3524 dependencies. This will be put into the .gnu.version_r section.
3525 This function is called via elf_link_hash_traverse. */
3528 elf_link_find_version_dependencies (h
, data
)
3529 struct elf_link_hash_entry
*h
;
3532 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3533 Elf_Internal_Verneed
*t
;
3534 Elf_Internal_Vernaux
*a
;
3536 /* We only care about symbols defined in shared objects with version
3538 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3539 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3541 || h
->verinfo
.verdef
== NULL
)
3544 /* See if we already know about this version. */
3545 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3547 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3550 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3551 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3557 /* This is a new version. Add it to tree we are building. */
3561 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3564 rinfo
->failed
= true;
3568 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3569 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3570 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3573 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3575 /* Note that we are copying a string pointer here, and testing it
3576 above. If bfd_elf_string_from_elf_section is ever changed to
3577 discard the string data when low in memory, this will have to be
3579 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3581 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3582 a
->vna_nextptr
= t
->vn_auxptr
;
3584 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3587 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3594 /* Figure out appropriate versions for all the symbols. We may not
3595 have the version number script until we have read all of the input
3596 files, so until that point we don't know which symbols should be
3597 local. This function is called via elf_link_hash_traverse. */
3600 elf_link_assign_sym_version (h
, data
)
3601 struct elf_link_hash_entry
*h
;
3604 struct elf_assign_sym_version_info
*sinfo
=
3605 (struct elf_assign_sym_version_info
*) data
;
3606 struct bfd_link_info
*info
= sinfo
->info
;
3607 struct elf_backend_data
*bed
;
3608 struct elf_info_failed eif
;
3611 /* Fix the symbol flags. */
3614 if (! elf_fix_symbol_flags (h
, &eif
))
3617 sinfo
->failed
= true;
3621 /* We only need version numbers for symbols defined in regular
3623 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3626 bed
= get_elf_backend_data (sinfo
->output_bfd
);
3627 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3628 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3630 struct bfd_elf_version_tree
*t
;
3635 /* There are two consecutive ELF_VER_CHR characters if this is
3636 not a hidden symbol. */
3638 if (*p
== ELF_VER_CHR
)
3644 /* If there is no version string, we can just return out. */
3648 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3652 /* Look for the version. If we find it, it is no longer weak. */
3653 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3655 if (strcmp (t
->name
, p
) == 0)
3659 struct bfd_elf_version_expr
*d
;
3661 len
= p
- h
->root
.root
.string
;
3662 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3665 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3666 alc
[len
- 1] = '\0';
3667 if (alc
[len
- 2] == ELF_VER_CHR
)
3668 alc
[len
- 2] = '\0';
3670 h
->verinfo
.vertree
= t
;
3674 if (t
->globals
!= NULL
)
3676 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3677 if ((*d
->match
) (d
, alc
))
3681 /* See if there is anything to force this symbol to
3683 if (d
== NULL
&& t
->locals
!= NULL
)
3685 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3687 if ((*d
->match
) (d
, alc
))
3689 if (h
->dynindx
!= -1
3691 && ! sinfo
->export_dynamic
)
3693 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3694 (*bed
->elf_backend_hide_symbol
) (h
);
3695 /* FIXME: The name of the symbol has
3696 already been recorded in the dynamic
3697 string table section. */
3705 bfd_release (sinfo
->output_bfd
, alc
);
3710 /* If we are building an application, we need to create a
3711 version node for this version. */
3712 if (t
== NULL
&& ! info
->shared
)
3714 struct bfd_elf_version_tree
**pp
;
3717 /* If we aren't going to export this symbol, we don't need
3718 to worry about it. */
3719 if (h
->dynindx
== -1)
3722 t
= ((struct bfd_elf_version_tree
*)
3723 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3726 sinfo
->failed
= true;
3735 t
->name_indx
= (unsigned int) -1;
3739 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3741 t
->vernum
= version_index
;
3745 h
->verinfo
.vertree
= t
;
3749 /* We could not find the version for a symbol when
3750 generating a shared archive. Return an error. */
3751 (*_bfd_error_handler
)
3752 (_("%s: undefined versioned symbol name %s"),
3753 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3754 bfd_set_error (bfd_error_bad_value
);
3755 sinfo
->failed
= true;
3760 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3763 /* If we don't have a version for this symbol, see if we can find
3765 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3767 struct bfd_elf_version_tree
*t
;
3768 struct bfd_elf_version_tree
*deflt
;
3769 struct bfd_elf_version_expr
*d
;
3771 /* See if can find what version this symbol is in. If the
3772 symbol is supposed to be local, then don't actually register
3775 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3777 if (t
->globals
!= NULL
)
3779 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3781 if ((*d
->match
) (d
, h
->root
.root
.string
))
3783 h
->verinfo
.vertree
= t
;
3792 if (t
->locals
!= NULL
)
3794 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3796 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3798 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3800 h
->verinfo
.vertree
= t
;
3801 if (h
->dynindx
!= -1
3803 && ! sinfo
->export_dynamic
)
3805 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3806 (*bed
->elf_backend_hide_symbol
) (h
);
3807 /* FIXME: The name of the symbol has already
3808 been recorded in the dynamic string table
3820 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3822 h
->verinfo
.vertree
= deflt
;
3823 if (h
->dynindx
!= -1
3825 && ! sinfo
->export_dynamic
)
3827 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3828 (*bed
->elf_backend_hide_symbol
) (h
);
3829 /* FIXME: The name of the symbol has already been
3830 recorded in the dynamic string table section. */
3838 /* Final phase of ELF linker. */
3840 /* A structure we use to avoid passing large numbers of arguments. */
3842 struct elf_final_link_info
3844 /* General link information. */
3845 struct bfd_link_info
*info
;
3848 /* Symbol string table. */
3849 struct bfd_strtab_hash
*symstrtab
;
3850 /* .dynsym section. */
3851 asection
*dynsym_sec
;
3852 /* .hash section. */
3854 /* symbol version section (.gnu.version). */
3855 asection
*symver_sec
;
3856 /* Buffer large enough to hold contents of any section. */
3858 /* Buffer large enough to hold external relocs of any section. */
3859 PTR external_relocs
;
3860 /* Buffer large enough to hold internal relocs of any section. */
3861 Elf_Internal_Rela
*internal_relocs
;
3862 /* Buffer large enough to hold external local symbols of any input
3864 Elf_External_Sym
*external_syms
;
3865 /* Buffer large enough to hold internal local symbols of any input
3867 Elf_Internal_Sym
*internal_syms
;
3868 /* Array large enough to hold a symbol index for each local symbol
3869 of any input BFD. */
3871 /* Array large enough to hold a section pointer for each local
3872 symbol of any input BFD. */
3873 asection
**sections
;
3874 /* Buffer to hold swapped out symbols. */
3875 Elf_External_Sym
*symbuf
;
3876 /* Number of swapped out symbols in buffer. */
3877 size_t symbuf_count
;
3878 /* Number of symbols which fit in symbuf. */
3882 static boolean elf_link_output_sym
3883 PARAMS ((struct elf_final_link_info
*, const char *,
3884 Elf_Internal_Sym
*, asection
*));
3885 static boolean elf_link_flush_output_syms
3886 PARAMS ((struct elf_final_link_info
*));
3887 static boolean elf_link_output_extsym
3888 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3889 static boolean elf_link_input_bfd
3890 PARAMS ((struct elf_final_link_info
*, bfd
*));
3891 static boolean elf_reloc_link_order
3892 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3893 struct bfd_link_order
*));
3895 /* This struct is used to pass information to elf_link_output_extsym. */
3897 struct elf_outext_info
3901 struct elf_final_link_info
*finfo
;
3904 /* Compute the size of, and allocate space for, REL_HDR which is the
3905 section header for a section containing relocations for O. */
3908 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
3910 Elf_Internal_Shdr
*rel_hdr
;
3913 register struct elf_link_hash_entry
**p
, **pend
;
3914 unsigned reloc_count
;
3916 /* Figure out how many relocations there will be. */
3917 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
3918 reloc_count
= elf_section_data (o
)->rel_count
;
3920 reloc_count
= elf_section_data (o
)->rel_count2
;
3922 /* That allows us to calculate the size of the section. */
3923 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
3925 /* The contents field must last into write_object_contents, so we
3926 allocate it with bfd_alloc rather than malloc. */
3927 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3928 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3931 /* We only allocate one set of hash entries, so we only do it the
3932 first time we are called. */
3933 if (elf_section_data (o
)->rel_hashes
== NULL
)
3935 p
= ((struct elf_link_hash_entry
**)
3936 bfd_malloc (o
->reloc_count
3937 * sizeof (struct elf_link_hash_entry
*)));
3938 if (p
== NULL
&& o
->reloc_count
!= 0)
3941 elf_section_data (o
)->rel_hashes
= p
;
3942 pend
= p
+ o
->reloc_count
;
3943 for (; p
< pend
; p
++)
3950 /* When performing a relocateable link, the input relocations are
3951 preserved. But, if they reference global symbols, the indices
3952 referenced must be updated. Update all the relocations in
3953 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
3956 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
3958 Elf_Internal_Shdr
*rel_hdr
;
3960 struct elf_link_hash_entry
**rel_hash
;
3964 for (i
= 0; i
< count
; i
++, rel_hash
++)
3966 if (*rel_hash
== NULL
)
3969 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3971 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3973 Elf_External_Rel
*erel
;
3974 Elf_Internal_Rel irel
;
3976 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3977 elf_swap_reloc_in (abfd
, erel
, &irel
);
3978 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3979 ELF_R_TYPE (irel
.r_info
));
3980 elf_swap_reloc_out (abfd
, &irel
, erel
);
3984 Elf_External_Rela
*erela
;
3985 Elf_Internal_Rela irela
;
3987 BFD_ASSERT (rel_hdr
->sh_entsize
3988 == sizeof (Elf_External_Rela
));
3990 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3991 elf_swap_reloca_in (abfd
, erela
, &irela
);
3992 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3993 ELF_R_TYPE (irela
.r_info
));
3994 elf_swap_reloca_out (abfd
, &irela
, erela
);
3999 /* Do the final step of an ELF link. */
4002 elf_bfd_final_link (abfd
, info
)
4004 struct bfd_link_info
*info
;
4008 struct elf_final_link_info finfo
;
4009 register asection
*o
;
4010 register struct bfd_link_order
*p
;
4012 size_t max_contents_size
;
4013 size_t max_external_reloc_size
;
4014 size_t max_internal_reloc_count
;
4015 size_t max_sym_count
;
4017 Elf_Internal_Sym elfsym
;
4019 Elf_Internal_Shdr
*symtab_hdr
;
4020 Elf_Internal_Shdr
*symstrtab_hdr
;
4021 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4022 struct elf_outext_info eoinfo
;
4025 abfd
->flags
|= DYNAMIC
;
4027 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
4028 dynobj
= elf_hash_table (info
)->dynobj
;
4031 finfo
.output_bfd
= abfd
;
4032 finfo
.symstrtab
= elf_stringtab_init ();
4033 if (finfo
.symstrtab
== NULL
)
4038 finfo
.dynsym_sec
= NULL
;
4039 finfo
.hash_sec
= NULL
;
4040 finfo
.symver_sec
= NULL
;
4044 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
4045 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
4046 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
4047 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
4048 /* Note that it is OK if symver_sec is NULL. */
4051 finfo
.contents
= NULL
;
4052 finfo
.external_relocs
= NULL
;
4053 finfo
.internal_relocs
= NULL
;
4054 finfo
.external_syms
= NULL
;
4055 finfo
.internal_syms
= NULL
;
4056 finfo
.indices
= NULL
;
4057 finfo
.sections
= NULL
;
4058 finfo
.symbuf
= NULL
;
4059 finfo
.symbuf_count
= 0;
4061 /* Count up the number of relocations we will output for each output
4062 section, so that we know the sizes of the reloc sections. We
4063 also figure out some maximum sizes. */
4064 max_contents_size
= 0;
4065 max_external_reloc_size
= 0;
4066 max_internal_reloc_count
= 0;
4068 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4072 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4074 if (p
->type
== bfd_section_reloc_link_order
4075 || p
->type
== bfd_symbol_reloc_link_order
)
4077 else if (p
->type
== bfd_indirect_link_order
)
4081 sec
= p
->u
.indirect
.section
;
4083 /* Mark all sections which are to be included in the
4084 link. This will normally be every section. We need
4085 to do this so that we can identify any sections which
4086 the linker has decided to not include. */
4087 sec
->linker_mark
= true;
4089 if (info
->relocateable
)
4090 o
->reloc_count
+= sec
->reloc_count
;
4092 if (sec
->_raw_size
> max_contents_size
)
4093 max_contents_size
= sec
->_raw_size
;
4094 if (sec
->_cooked_size
> max_contents_size
)
4095 max_contents_size
= sec
->_cooked_size
;
4097 /* We are interested in just local symbols, not all
4099 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4100 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4104 if (elf_bad_symtab (sec
->owner
))
4105 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4106 / sizeof (Elf_External_Sym
));
4108 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4110 if (sym_count
> max_sym_count
)
4111 max_sym_count
= sym_count
;
4113 if ((sec
->flags
& SEC_RELOC
) != 0)
4117 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4118 if (ext_size
> max_external_reloc_size
)
4119 max_external_reloc_size
= ext_size
;
4120 if (sec
->reloc_count
> max_internal_reloc_count
)
4121 max_internal_reloc_count
= sec
->reloc_count
;
4127 if (o
->reloc_count
> 0)
4128 o
->flags
|= SEC_RELOC
;
4131 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4132 set it (this is probably a bug) and if it is set
4133 assign_section_numbers will create a reloc section. */
4134 o
->flags
&=~ SEC_RELOC
;
4137 /* If the SEC_ALLOC flag is not set, force the section VMA to
4138 zero. This is done in elf_fake_sections as well, but forcing
4139 the VMA to 0 here will ensure that relocs against these
4140 sections are handled correctly. */
4141 if ((o
->flags
& SEC_ALLOC
) == 0
4142 && ! o
->user_set_vma
)
4146 /* Figure out the file positions for everything but the symbol table
4147 and the relocs. We set symcount to force assign_section_numbers
4148 to create a symbol table. */
4149 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4150 BFD_ASSERT (! abfd
->output_has_begun
);
4151 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4154 /* Figure out how many relocations we will have in each section.
4155 Just using RELOC_COUNT isn't good enough since that doesn't
4156 maintain a separate value for REL vs. RELA relocations. */
4157 if (info
->relocateable
)
4158 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4159 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4161 asection
*output_section
;
4163 if (! o
->linker_mark
)
4165 /* This section was omitted from the link. */
4169 output_section
= o
->output_section
;
4171 if (output_section
!= NULL
4172 && (o
->flags
& SEC_RELOC
) != 0)
4174 struct bfd_elf_section_data
*esdi
4175 = elf_section_data (o
);
4176 struct bfd_elf_section_data
*esdo
4177 = elf_section_data (output_section
);
4178 unsigned int *rel_count
;
4179 unsigned int *rel_count2
;
4181 /* We must be careful to add the relocation froms the
4182 input section to the right output count. */
4183 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
4185 rel_count
= &esdo
->rel_count
;
4186 rel_count2
= &esdo
->rel_count2
;
4190 rel_count
= &esdo
->rel_count2
;
4191 rel_count2
= &esdo
->rel_count
;
4194 *rel_count
+= (esdi
->rel_hdr
.sh_size
4195 / esdi
->rel_hdr
.sh_entsize
);
4197 *rel_count2
+= (esdi
->rel_hdr2
->sh_size
4198 / esdi
->rel_hdr2
->sh_entsize
);
4202 /* That created the reloc sections. Set their sizes, and assign
4203 them file positions, and allocate some buffers. */
4204 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4206 if ((o
->flags
& SEC_RELOC
) != 0)
4208 if (!elf_link_size_reloc_section (abfd
,
4209 &elf_section_data (o
)->rel_hdr
,
4213 if (elf_section_data (o
)->rel_hdr2
4214 && !elf_link_size_reloc_section (abfd
,
4215 elf_section_data (o
)->rel_hdr2
,
4220 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4221 to count upwards while actually outputting the relocations. */
4222 elf_section_data (o
)->rel_count
= 0;
4223 elf_section_data (o
)->rel_count2
= 0;
4226 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4228 /* We have now assigned file positions for all the sections except
4229 .symtab and .strtab. We start the .symtab section at the current
4230 file position, and write directly to it. We build the .strtab
4231 section in memory. */
4232 bfd_get_symcount (abfd
) = 0;
4233 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4234 /* sh_name is set in prep_headers. */
4235 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4236 symtab_hdr
->sh_flags
= 0;
4237 symtab_hdr
->sh_addr
= 0;
4238 symtab_hdr
->sh_size
= 0;
4239 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4240 /* sh_link is set in assign_section_numbers. */
4241 /* sh_info is set below. */
4242 /* sh_offset is set just below. */
4243 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4245 off
= elf_tdata (abfd
)->next_file_pos
;
4246 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4248 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4249 incorrect. We do not yet know the size of the .symtab section.
4250 We correct next_file_pos below, after we do know the size. */
4252 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4253 continuously seeking to the right position in the file. */
4254 if (! info
->keep_memory
|| max_sym_count
< 20)
4255 finfo
.symbuf_size
= 20;
4257 finfo
.symbuf_size
= max_sym_count
;
4258 finfo
.symbuf
= ((Elf_External_Sym
*)
4259 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4260 if (finfo
.symbuf
== NULL
)
4263 /* Start writing out the symbol table. The first symbol is always a
4265 if (info
->strip
!= strip_all
|| info
->relocateable
)
4267 elfsym
.st_value
= 0;
4270 elfsym
.st_other
= 0;
4271 elfsym
.st_shndx
= SHN_UNDEF
;
4272 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4273 &elfsym
, bfd_und_section_ptr
))
4278 /* Some standard ELF linkers do this, but we don't because it causes
4279 bootstrap comparison failures. */
4280 /* Output a file symbol for the output file as the second symbol.
4281 We output this even if we are discarding local symbols, although
4282 I'm not sure if this is correct. */
4283 elfsym
.st_value
= 0;
4285 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4286 elfsym
.st_other
= 0;
4287 elfsym
.st_shndx
= SHN_ABS
;
4288 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4289 &elfsym
, bfd_abs_section_ptr
))
4293 /* Output a symbol for each section. We output these even if we are
4294 discarding local symbols, since they are used for relocs. These
4295 symbols have no names. We store the index of each one in the
4296 index field of the section, so that we can find it again when
4297 outputting relocs. */
4298 if (info
->strip
!= strip_all
|| info
->relocateable
)
4301 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4302 elfsym
.st_other
= 0;
4303 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4305 o
= section_from_elf_index (abfd
, i
);
4307 o
->target_index
= bfd_get_symcount (abfd
);
4308 elfsym
.st_shndx
= i
;
4309 if (info
->relocateable
|| o
== NULL
)
4310 elfsym
.st_value
= 0;
4312 elfsym
.st_value
= o
->vma
;
4313 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4319 /* Allocate some memory to hold information read in from the input
4321 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4322 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4323 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4324 bfd_malloc (max_internal_reloc_count
4325 * sizeof (Elf_Internal_Rela
)
4326 * bed
->s
->int_rels_per_ext_rel
));
4327 finfo
.external_syms
= ((Elf_External_Sym
*)
4328 bfd_malloc (max_sym_count
4329 * sizeof (Elf_External_Sym
)));
4330 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4331 bfd_malloc (max_sym_count
4332 * sizeof (Elf_Internal_Sym
)));
4333 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4334 finfo
.sections
= ((asection
**)
4335 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4336 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4337 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4338 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4339 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4340 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4341 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4342 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4345 /* Since ELF permits relocations to be against local symbols, we
4346 must have the local symbols available when we do the relocations.
4347 Since we would rather only read the local symbols once, and we
4348 would rather not keep them in memory, we handle all the
4349 relocations for a single input file at the same time.
4351 Unfortunately, there is no way to know the total number of local
4352 symbols until we have seen all of them, and the local symbol
4353 indices precede the global symbol indices. This means that when
4354 we are generating relocateable output, and we see a reloc against
4355 a global symbol, we can not know the symbol index until we have
4356 finished examining all the local symbols to see which ones we are
4357 going to output. To deal with this, we keep the relocations in
4358 memory, and don't output them until the end of the link. This is
4359 an unfortunate waste of memory, but I don't see a good way around
4360 it. Fortunately, it only happens when performing a relocateable
4361 link, which is not the common case. FIXME: If keep_memory is set
4362 we could write the relocs out and then read them again; I don't
4363 know how bad the memory loss will be. */
4365 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4366 sub
->output_has_begun
= false;
4367 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4369 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4371 if (p
->type
== bfd_indirect_link_order
4372 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4373 == bfd_target_elf_flavour
))
4375 sub
= p
->u
.indirect
.section
->owner
;
4376 if (! sub
->output_has_begun
)
4378 if (! elf_link_input_bfd (&finfo
, sub
))
4380 sub
->output_has_begun
= true;
4383 else if (p
->type
== bfd_section_reloc_link_order
4384 || p
->type
== bfd_symbol_reloc_link_order
)
4386 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4391 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4397 /* That wrote out all the local symbols. Finish up the symbol table
4398 with the global symbols. */
4402 /* Output any global symbols that got converted to local in a
4403 version script. We do this in a separate step since ELF
4404 requires all local symbols to appear prior to any global
4405 symbols. FIXME: We should only do this if some global
4406 symbols were, in fact, converted to become local. FIXME:
4407 Will this work correctly with the Irix 5 linker? */
4408 eoinfo
.failed
= false;
4409 eoinfo
.finfo
= &finfo
;
4410 eoinfo
.localsyms
= true;
4411 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4417 /* The sh_info field records the index of the first non local symbol. */
4418 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4422 Elf_Internal_Sym sym
;
4423 Elf_External_Sym
*dynsym
=
4424 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4425 long last_local
= 0;
4427 /* Write out the section symbols for the output sections. */
4434 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4437 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4440 indx
= elf_section_data (s
)->this_idx
;
4441 BFD_ASSERT (indx
> 0);
4442 sym
.st_shndx
= indx
;
4443 sym
.st_value
= s
->vma
;
4445 elf_swap_symbol_out (abfd
, &sym
,
4446 dynsym
+ elf_section_data (s
)->dynindx
);
4449 last_local
= bfd_count_sections (abfd
);
4452 /* Write out the local dynsyms. */
4453 if (elf_hash_table (info
)->dynlocal
)
4455 struct elf_link_local_dynamic_entry
*e
;
4456 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4460 sym
.st_size
= e
->isym
.st_size
;
4461 sym
.st_other
= e
->isym
.st_other
;
4463 /* Copy the internal symbol as is.
4464 Note that we saved a word of storage and overwrote
4465 the original st_name with the dynstr_index. */
4468 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4470 s
= bfd_section_from_elf_index (e
->input_bfd
,
4474 elf_section_data (s
->output_section
)->this_idx
;
4475 sym
.st_value
= (s
->output_section
->vma
4477 + e
->isym
.st_value
);
4480 if (last_local
< e
->dynindx
)
4481 last_local
= e
->dynindx
;
4483 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4487 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
4491 /* We get the global symbols from the hash table. */
4492 eoinfo
.failed
= false;
4493 eoinfo
.localsyms
= false;
4494 eoinfo
.finfo
= &finfo
;
4495 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4500 /* If backend needs to output some symbols not present in the hash
4501 table, do it now. */
4502 if (bed
->elf_backend_output_arch_syms
)
4504 if (! (*bed
->elf_backend_output_arch_syms
)
4505 (abfd
, info
, (PTR
) &finfo
,
4506 (boolean (*) PARAMS ((PTR
, const char *,
4507 Elf_Internal_Sym
*, asection
*)))
4508 elf_link_output_sym
))
4512 /* Flush all symbols to the file. */
4513 if (! elf_link_flush_output_syms (&finfo
))
4516 /* Now we know the size of the symtab section. */
4517 off
+= symtab_hdr
->sh_size
;
4519 /* Finish up and write out the symbol string table (.strtab)
4521 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4522 /* sh_name was set in prep_headers. */
4523 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4524 symstrtab_hdr
->sh_flags
= 0;
4525 symstrtab_hdr
->sh_addr
= 0;
4526 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4527 symstrtab_hdr
->sh_entsize
= 0;
4528 symstrtab_hdr
->sh_link
= 0;
4529 symstrtab_hdr
->sh_info
= 0;
4530 /* sh_offset is set just below. */
4531 symstrtab_hdr
->sh_addralign
= 1;
4533 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4534 elf_tdata (abfd
)->next_file_pos
= off
;
4536 if (bfd_get_symcount (abfd
) > 0)
4538 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4539 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4543 /* Adjust the relocs to have the correct symbol indices. */
4544 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4546 if ((o
->flags
& SEC_RELOC
) == 0)
4549 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4550 elf_section_data (o
)->rel_count
,
4551 elf_section_data (o
)->rel_hashes
);
4552 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4553 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4554 elf_section_data (o
)->rel_count2
,
4555 (elf_section_data (o
)->rel_hashes
4556 + elf_section_data (o
)->rel_count
));
4558 /* Set the reloc_count field to 0 to prevent write_relocs from
4559 trying to swap the relocs out itself. */
4563 /* If we are linking against a dynamic object, or generating a
4564 shared library, finish up the dynamic linking information. */
4567 Elf_External_Dyn
*dyncon
, *dynconend
;
4569 /* Fix up .dynamic entries. */
4570 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4571 BFD_ASSERT (o
!= NULL
);
4573 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4574 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4575 for (; dyncon
< dynconend
; dyncon
++)
4577 Elf_Internal_Dyn dyn
;
4581 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4588 name
= info
->init_function
;
4591 name
= info
->fini_function
;
4594 struct elf_link_hash_entry
*h
;
4596 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4597 false, false, true);
4599 && (h
->root
.type
== bfd_link_hash_defined
4600 || h
->root
.type
== bfd_link_hash_defweak
))
4602 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4603 o
= h
->root
.u
.def
.section
;
4604 if (o
->output_section
!= NULL
)
4605 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4606 + o
->output_offset
);
4609 /* The symbol is imported from another shared
4610 library and does not apply to this one. */
4614 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4629 name
= ".gnu.version_d";
4632 name
= ".gnu.version_r";
4635 name
= ".gnu.version";
4637 o
= bfd_get_section_by_name (abfd
, name
);
4638 BFD_ASSERT (o
!= NULL
);
4639 dyn
.d_un
.d_ptr
= o
->vma
;
4640 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4647 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4652 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4654 Elf_Internal_Shdr
*hdr
;
4656 hdr
= elf_elfsections (abfd
)[i
];
4657 if (hdr
->sh_type
== type
4658 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4660 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4661 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4664 if (dyn
.d_un
.d_val
== 0
4665 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4666 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4670 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4676 /* If we have created any dynamic sections, then output them. */
4679 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4682 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4684 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4685 || o
->_raw_size
== 0)
4687 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4689 /* At this point, we are only interested in sections
4690 created by elf_link_create_dynamic_sections. */
4693 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4695 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4697 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4698 o
->contents
, o
->output_offset
,
4706 /* The contents of the .dynstr section are actually in a
4708 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4709 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4710 || ! _bfd_stringtab_emit (abfd
,
4711 elf_hash_table (info
)->dynstr
))
4717 /* If we have optimized stabs strings, output them. */
4718 if (elf_hash_table (info
)->stab_info
!= NULL
)
4720 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4724 if (finfo
.symstrtab
!= NULL
)
4725 _bfd_stringtab_free (finfo
.symstrtab
);
4726 if (finfo
.contents
!= NULL
)
4727 free (finfo
.contents
);
4728 if (finfo
.external_relocs
!= NULL
)
4729 free (finfo
.external_relocs
);
4730 if (finfo
.internal_relocs
!= NULL
)
4731 free (finfo
.internal_relocs
);
4732 if (finfo
.external_syms
!= NULL
)
4733 free (finfo
.external_syms
);
4734 if (finfo
.internal_syms
!= NULL
)
4735 free (finfo
.internal_syms
);
4736 if (finfo
.indices
!= NULL
)
4737 free (finfo
.indices
);
4738 if (finfo
.sections
!= NULL
)
4739 free (finfo
.sections
);
4740 if (finfo
.symbuf
!= NULL
)
4741 free (finfo
.symbuf
);
4742 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4744 if ((o
->flags
& SEC_RELOC
) != 0
4745 && elf_section_data (o
)->rel_hashes
!= NULL
)
4746 free (elf_section_data (o
)->rel_hashes
);
4749 elf_tdata (abfd
)->linker
= true;
4754 if (finfo
.symstrtab
!= NULL
)
4755 _bfd_stringtab_free (finfo
.symstrtab
);
4756 if (finfo
.contents
!= NULL
)
4757 free (finfo
.contents
);
4758 if (finfo
.external_relocs
!= NULL
)
4759 free (finfo
.external_relocs
);
4760 if (finfo
.internal_relocs
!= NULL
)
4761 free (finfo
.internal_relocs
);
4762 if (finfo
.external_syms
!= NULL
)
4763 free (finfo
.external_syms
);
4764 if (finfo
.internal_syms
!= NULL
)
4765 free (finfo
.internal_syms
);
4766 if (finfo
.indices
!= NULL
)
4767 free (finfo
.indices
);
4768 if (finfo
.sections
!= NULL
)
4769 free (finfo
.sections
);
4770 if (finfo
.symbuf
!= NULL
)
4771 free (finfo
.symbuf
);
4772 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4774 if ((o
->flags
& SEC_RELOC
) != 0
4775 && elf_section_data (o
)->rel_hashes
!= NULL
)
4776 free (elf_section_data (o
)->rel_hashes
);
4782 /* Add a symbol to the output symbol table. */
4785 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4786 struct elf_final_link_info
*finfo
;
4788 Elf_Internal_Sym
*elfsym
;
4789 asection
*input_sec
;
4791 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4792 struct bfd_link_info
*info
,
4797 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4798 elf_backend_link_output_symbol_hook
;
4799 if (output_symbol_hook
!= NULL
)
4801 if (! ((*output_symbol_hook
)
4802 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4806 if (name
== (const char *) NULL
|| *name
== '\0')
4807 elfsym
->st_name
= 0;
4808 else if (input_sec
->flags
& SEC_EXCLUDE
)
4809 elfsym
->st_name
= 0;
4812 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4815 if (elfsym
->st_name
== (unsigned long) -1)
4819 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4821 if (! elf_link_flush_output_syms (finfo
))
4825 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4826 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4827 ++finfo
->symbuf_count
;
4829 ++ bfd_get_symcount (finfo
->output_bfd
);
4834 /* Flush the output symbols to the file. */
4837 elf_link_flush_output_syms (finfo
)
4838 struct elf_final_link_info
*finfo
;
4840 if (finfo
->symbuf_count
> 0)
4842 Elf_Internal_Shdr
*symtab
;
4844 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4846 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4848 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4849 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4850 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4853 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4855 finfo
->symbuf_count
= 0;
4861 /* Add an external symbol to the symbol table. This is called from
4862 the hash table traversal routine. When generating a shared object,
4863 we go through the symbol table twice. The first time we output
4864 anything that might have been forced to local scope in a version
4865 script. The second time we output the symbols that are still
4869 elf_link_output_extsym (h
, data
)
4870 struct elf_link_hash_entry
*h
;
4873 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4874 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4876 Elf_Internal_Sym sym
;
4877 asection
*input_sec
;
4879 /* Decide whether to output this symbol in this pass. */
4880 if (eoinfo
->localsyms
)
4882 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4887 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4891 /* If we are not creating a shared library, and this symbol is
4892 referenced by a shared library but is not defined anywhere, then
4893 warn that it is undefined. If we do not do this, the runtime
4894 linker will complain that the symbol is undefined when the
4895 program is run. We don't have to worry about symbols that are
4896 referenced by regular files, because we will already have issued
4897 warnings for them. */
4898 if (! finfo
->info
->relocateable
4899 && ! (finfo
->info
->shared
4900 && !finfo
->info
->no_undefined
)
4901 && h
->root
.type
== bfd_link_hash_undefined
4902 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4903 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4905 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4906 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4907 (asection
*) NULL
, 0)))
4909 eoinfo
->failed
= true;
4914 /* We don't want to output symbols that have never been mentioned by
4915 a regular file, or that we have been told to strip. However, if
4916 h->indx is set to -2, the symbol is used by a reloc and we must
4920 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4921 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4922 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4923 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4925 else if (finfo
->info
->strip
== strip_all
4926 || (finfo
->info
->strip
== strip_some
4927 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4928 h
->root
.root
.string
,
4929 false, false) == NULL
))
4934 /* If we're stripping it, and it's not a dynamic symbol, there's
4935 nothing else to do unless it is a forced local symbol. */
4938 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4942 sym
.st_size
= h
->size
;
4943 sym
.st_other
= h
->other
;
4944 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4945 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4946 else if (h
->root
.type
== bfd_link_hash_undefweak
4947 || h
->root
.type
== bfd_link_hash_defweak
)
4948 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4950 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4952 switch (h
->root
.type
)
4955 case bfd_link_hash_new
:
4959 case bfd_link_hash_undefined
:
4960 input_sec
= bfd_und_section_ptr
;
4961 sym
.st_shndx
= SHN_UNDEF
;
4964 case bfd_link_hash_undefweak
:
4965 input_sec
= bfd_und_section_ptr
;
4966 sym
.st_shndx
= SHN_UNDEF
;
4969 case bfd_link_hash_defined
:
4970 case bfd_link_hash_defweak
:
4972 input_sec
= h
->root
.u
.def
.section
;
4973 if (input_sec
->output_section
!= NULL
)
4976 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4977 input_sec
->output_section
);
4978 if (sym
.st_shndx
== (unsigned short) -1)
4980 (*_bfd_error_handler
)
4981 (_("%s: could not find output section %s for input section %s"),
4982 bfd_get_filename (finfo
->output_bfd
),
4983 input_sec
->output_section
->name
,
4985 eoinfo
->failed
= true;
4989 /* ELF symbols in relocateable files are section relative,
4990 but in nonrelocateable files they are virtual
4992 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4993 if (! finfo
->info
->relocateable
)
4994 sym
.st_value
+= input_sec
->output_section
->vma
;
4998 BFD_ASSERT (input_sec
->owner
== NULL
4999 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
5000 sym
.st_shndx
= SHN_UNDEF
;
5001 input_sec
= bfd_und_section_ptr
;
5006 case bfd_link_hash_common
:
5007 input_sec
= h
->root
.u
.c
.p
->section
;
5008 sym
.st_shndx
= SHN_COMMON
;
5009 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
5012 case bfd_link_hash_indirect
:
5013 /* These symbols are created by symbol versioning. They point
5014 to the decorated version of the name. For example, if the
5015 symbol foo@@GNU_1.2 is the default, which should be used when
5016 foo is used with no version, then we add an indirect symbol
5017 foo which points to foo@@GNU_1.2. We ignore these symbols,
5018 since the indirected symbol is already in the hash table. If
5019 the indirect symbol is non-ELF, fall through and output it. */
5020 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
5024 case bfd_link_hash_warning
:
5025 /* We can't represent these symbols in ELF, although a warning
5026 symbol may have come from a .gnu.warning.SYMBOL section. We
5027 just put the target symbol in the hash table. If the target
5028 symbol does not really exist, don't do anything. */
5029 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
5031 return (elf_link_output_extsym
5032 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
5035 /* Give the processor backend a chance to tweak the symbol value,
5036 and also to finish up anything that needs to be done for this
5038 if ((h
->dynindx
!= -1
5039 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
5040 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5042 struct elf_backend_data
*bed
;
5044 bed
= get_elf_backend_data (finfo
->output_bfd
);
5045 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
5046 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
5048 eoinfo
->failed
= true;
5053 /* If we are marking the symbol as undefined, and there are no
5054 non-weak references to this symbol from a regular object, then
5055 mark the symbol as weak undefined; if there are non-weak
5056 references, mark the symbol as strong. We can't do this earlier,
5057 because it might not be marked as undefined until the
5058 finish_dynamic_symbol routine gets through with it. */
5059 if (sym
.st_shndx
== SHN_UNDEF
5060 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
5061 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
5062 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
5066 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
5067 bindtype
= STB_GLOBAL
;
5069 bindtype
= STB_WEAK
;
5070 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
5073 /* If this symbol should be put in the .dynsym section, then put it
5074 there now. We have already know the symbol index. We also fill
5075 in the entry in the .hash section. */
5076 if (h
->dynindx
!= -1
5077 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5081 size_t hash_entry_size
;
5082 bfd_byte
*bucketpos
;
5085 sym
.st_name
= h
->dynstr_index
;
5087 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
5088 (PTR
) (((Elf_External_Sym
*)
5089 finfo
->dynsym_sec
->contents
)
5092 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
5093 bucket
= h
->elf_hash_value
% bucketcount
;
5095 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
5096 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
5097 + (bucket
+ 2) * hash_entry_size
);
5098 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
5099 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
5100 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
5101 ((bfd_byte
*) finfo
->hash_sec
->contents
5102 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
5104 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
5106 Elf_Internal_Versym iversym
;
5108 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5110 if (h
->verinfo
.verdef
== NULL
)
5111 iversym
.vs_vers
= 0;
5113 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
5117 if (h
->verinfo
.vertree
== NULL
)
5118 iversym
.vs_vers
= 1;
5120 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
5123 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
5124 iversym
.vs_vers
|= VERSYM_HIDDEN
;
5126 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
5127 (((Elf_External_Versym
*)
5128 finfo
->symver_sec
->contents
)
5133 /* If we're stripping it, then it was just a dynamic symbol, and
5134 there's nothing else to do. */
5138 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
5140 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
5142 eoinfo
->failed
= true;
5149 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5150 originated from the section given by INPUT_REL_HDR) to the
5154 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
5157 asection
*input_section
;
5158 Elf_Internal_Shdr
*input_rel_hdr
;
5159 Elf_Internal_Rela
*internal_relocs
;
5161 Elf_Internal_Rela
*irela
;
5162 Elf_Internal_Rela
*irelaend
;
5163 Elf_Internal_Shdr
*output_rel_hdr
;
5164 asection
*output_section
;
5165 unsigned int *rel_countp
= NULL
;
5167 output_section
= input_section
->output_section
;
5168 output_rel_hdr
= NULL
;
5170 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
5171 == input_rel_hdr
->sh_entsize
)
5173 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5174 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5176 else if (elf_section_data (output_section
)->rel_hdr2
5177 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5178 == input_rel_hdr
->sh_entsize
))
5180 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5181 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5184 BFD_ASSERT (output_rel_hdr
!= NULL
);
5186 irela
= internal_relocs
;
5187 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5188 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5190 Elf_External_Rel
*erel
;
5192 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5193 for (; irela
< irelaend
; irela
++, erel
++)
5195 Elf_Internal_Rel irel
;
5197 irel
.r_offset
= irela
->r_offset
;
5198 irel
.r_info
= irela
->r_info
;
5199 BFD_ASSERT (irela
->r_addend
== 0);
5200 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5205 Elf_External_Rela
*erela
;
5207 BFD_ASSERT (input_rel_hdr
->sh_entsize
5208 == sizeof (Elf_External_Rela
));
5209 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5210 for (; irela
< irelaend
; irela
++, erela
++)
5211 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5214 /* Bump the counter, so that we know where to add the next set of
5216 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5219 /* Link an input file into the linker output file. This function
5220 handles all the sections and relocations of the input file at once.
5221 This is so that we only have to read the local symbols once, and
5222 don't have to keep them in memory. */
5225 elf_link_input_bfd (finfo
, input_bfd
)
5226 struct elf_final_link_info
*finfo
;
5229 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5230 bfd
*, asection
*, bfd_byte
*,
5231 Elf_Internal_Rela
*,
5232 Elf_Internal_Sym
*, asection
**));
5234 Elf_Internal_Shdr
*symtab_hdr
;
5237 Elf_External_Sym
*external_syms
;
5238 Elf_External_Sym
*esym
;
5239 Elf_External_Sym
*esymend
;
5240 Elf_Internal_Sym
*isym
;
5242 asection
**ppsection
;
5244 struct elf_backend_data
*bed
;
5246 output_bfd
= finfo
->output_bfd
;
5247 bed
= get_elf_backend_data (output_bfd
);
5248 relocate_section
= bed
->elf_backend_relocate_section
;
5250 /* If this is a dynamic object, we don't want to do anything here:
5251 we don't want the local symbols, and we don't want the section
5253 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5256 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5257 if (elf_bad_symtab (input_bfd
))
5259 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5264 locsymcount
= symtab_hdr
->sh_info
;
5265 extsymoff
= symtab_hdr
->sh_info
;
5268 /* Read the local symbols. */
5269 if (symtab_hdr
->contents
!= NULL
)
5270 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5271 else if (locsymcount
== 0)
5272 external_syms
= NULL
;
5275 external_syms
= finfo
->external_syms
;
5276 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5277 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5278 locsymcount
, input_bfd
)
5279 != locsymcount
* sizeof (Elf_External_Sym
)))
5283 /* Swap in the local symbols and write out the ones which we know
5284 are going into the output file. */
5285 esym
= external_syms
;
5286 esymend
= esym
+ locsymcount
;
5287 isym
= finfo
->internal_syms
;
5288 pindex
= finfo
->indices
;
5289 ppsection
= finfo
->sections
;
5290 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5294 Elf_Internal_Sym osym
;
5296 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5299 if (elf_bad_symtab (input_bfd
))
5301 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5308 if (isym
->st_shndx
== SHN_UNDEF
)
5309 isec
= bfd_und_section_ptr
;
5310 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5311 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5312 else if (isym
->st_shndx
== SHN_ABS
)
5313 isec
= bfd_abs_section_ptr
;
5314 else if (isym
->st_shndx
== SHN_COMMON
)
5315 isec
= bfd_com_section_ptr
;
5324 /* Don't output the first, undefined, symbol. */
5325 if (esym
== external_syms
)
5328 /* If we are stripping all symbols, we don't want to output this
5330 if (finfo
->info
->strip
== strip_all
)
5333 /* We never output section symbols. Instead, we use the section
5334 symbol of the corresponding section in the output file. */
5335 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5338 /* If we are discarding all local symbols, we don't want to
5339 output this one. If we are generating a relocateable output
5340 file, then some of the local symbols may be required by
5341 relocs; we output them below as we discover that they are
5343 if (finfo
->info
->discard
== discard_all
)
5346 /* If this symbol is defined in a section which we are
5347 discarding, we don't need to keep it, but note that
5348 linker_mark is only reliable for sections that have contents.
5349 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5350 as well as linker_mark. */
5351 if (isym
->st_shndx
> 0
5352 && isym
->st_shndx
< SHN_LORESERVE
5354 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5355 || (! finfo
->info
->relocateable
5356 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5359 /* Get the name of the symbol. */
5360 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5365 /* See if we are discarding symbols with this name. */
5366 if ((finfo
->info
->strip
== strip_some
5367 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5369 || (finfo
->info
->discard
== discard_l
5370 && bfd_is_local_label_name (input_bfd
, name
)))
5373 /* If we get here, we are going to output this symbol. */
5377 /* Adjust the section index for the output file. */
5378 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5379 isec
->output_section
);
5380 if (osym
.st_shndx
== (unsigned short) -1)
5383 *pindex
= bfd_get_symcount (output_bfd
);
5385 /* ELF symbols in relocateable files are section relative, but
5386 in executable files they are virtual addresses. Note that
5387 this code assumes that all ELF sections have an associated
5388 BFD section with a reasonable value for output_offset; below
5389 we assume that they also have a reasonable value for
5390 output_section. Any special sections must be set up to meet
5391 these requirements. */
5392 osym
.st_value
+= isec
->output_offset
;
5393 if (! finfo
->info
->relocateable
)
5394 osym
.st_value
+= isec
->output_section
->vma
;
5396 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5400 /* Relocate the contents of each section. */
5401 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5405 if (! o
->linker_mark
)
5407 /* This section was omitted from the link. */
5411 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5412 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5415 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5417 /* Section was created by elf_link_create_dynamic_sections
5422 /* Get the contents of the section. They have been cached by a
5423 relaxation routine. Note that o is a section in an input
5424 file, so the contents field will not have been set by any of
5425 the routines which work on output files. */
5426 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5427 contents
= elf_section_data (o
)->this_hdr
.contents
;
5430 contents
= finfo
->contents
;
5431 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5432 (file_ptr
) 0, o
->_raw_size
))
5436 if ((o
->flags
& SEC_RELOC
) != 0)
5438 Elf_Internal_Rela
*internal_relocs
;
5440 /* Get the swapped relocs. */
5441 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5442 (input_bfd
, o
, finfo
->external_relocs
,
5443 finfo
->internal_relocs
, false));
5444 if (internal_relocs
== NULL
5445 && o
->reloc_count
> 0)
5448 /* Relocate the section by invoking a back end routine.
5450 The back end routine is responsible for adjusting the
5451 section contents as necessary, and (if using Rela relocs
5452 and generating a relocateable output file) adjusting the
5453 reloc addend as necessary.
5455 The back end routine does not have to worry about setting
5456 the reloc address or the reloc symbol index.
5458 The back end routine is given a pointer to the swapped in
5459 internal symbols, and can access the hash table entries
5460 for the external symbols via elf_sym_hashes (input_bfd).
5462 When generating relocateable output, the back end routine
5463 must handle STB_LOCAL/STT_SECTION symbols specially. The
5464 output symbol is going to be a section symbol
5465 corresponding to the output section, which will require
5466 the addend to be adjusted. */
5468 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5469 input_bfd
, o
, contents
,
5471 finfo
->internal_syms
,
5475 if (finfo
->info
->relocateable
)
5477 Elf_Internal_Rela
*irela
;
5478 Elf_Internal_Rela
*irelaend
;
5479 struct elf_link_hash_entry
**rel_hash
;
5480 Elf_Internal_Shdr
*input_rel_hdr
;
5482 /* Adjust the reloc addresses and symbol indices. */
5484 irela
= internal_relocs
;
5486 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5487 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5488 + elf_section_data (o
->output_section
)->rel_count
5489 + elf_section_data (o
->output_section
)->rel_count2
);
5490 for (; irela
< irelaend
; irela
++, rel_hash
++)
5492 unsigned long r_symndx
;
5493 Elf_Internal_Sym
*isym
;
5496 irela
->r_offset
+= o
->output_offset
;
5498 r_symndx
= ELF_R_SYM (irela
->r_info
);
5503 if (r_symndx
>= locsymcount
5504 || (elf_bad_symtab (input_bfd
)
5505 && finfo
->sections
[r_symndx
] == NULL
))
5507 struct elf_link_hash_entry
*rh
;
5510 /* This is a reloc against a global symbol. We
5511 have not yet output all the local symbols, so
5512 we do not know the symbol index of any global
5513 symbol. We set the rel_hash entry for this
5514 reloc to point to the global hash table entry
5515 for this symbol. The symbol index is then
5516 set at the end of elf_bfd_final_link. */
5517 indx
= r_symndx
- extsymoff
;
5518 rh
= elf_sym_hashes (input_bfd
)[indx
];
5519 while (rh
->root
.type
== bfd_link_hash_indirect
5520 || rh
->root
.type
== bfd_link_hash_warning
)
5521 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5523 /* Setting the index to -2 tells
5524 elf_link_output_extsym that this symbol is
5526 BFD_ASSERT (rh
->indx
< 0);
5534 /* This is a reloc against a local symbol. */
5537 isym
= finfo
->internal_syms
+ r_symndx
;
5538 sec
= finfo
->sections
[r_symndx
];
5539 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5541 /* I suppose the backend ought to fill in the
5542 section of any STT_SECTION symbol against a
5543 processor specific section. If we have
5544 discarded a section, the output_section will
5545 be the absolute section. */
5547 && (bfd_is_abs_section (sec
)
5548 || (sec
->output_section
!= NULL
5549 && bfd_is_abs_section (sec
->output_section
))))
5551 else if (sec
== NULL
|| sec
->owner
== NULL
)
5553 bfd_set_error (bfd_error_bad_value
);
5558 r_symndx
= sec
->output_section
->target_index
;
5559 BFD_ASSERT (r_symndx
!= 0);
5564 if (finfo
->indices
[r_symndx
] == -1)
5570 if (finfo
->info
->strip
== strip_all
)
5572 /* You can't do ld -r -s. */
5573 bfd_set_error (bfd_error_invalid_operation
);
5577 /* This symbol was skipped earlier, but
5578 since it is needed by a reloc, we
5579 must output it now. */
5580 link
= symtab_hdr
->sh_link
;
5581 name
= bfd_elf_string_from_elf_section (input_bfd
,
5587 osec
= sec
->output_section
;
5589 _bfd_elf_section_from_bfd_section (output_bfd
,
5591 if (isym
->st_shndx
== (unsigned short) -1)
5594 isym
->st_value
+= sec
->output_offset
;
5595 if (! finfo
->info
->relocateable
)
5596 isym
->st_value
+= osec
->vma
;
5598 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5600 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5604 r_symndx
= finfo
->indices
[r_symndx
];
5607 irela
->r_info
= ELF_R_INFO (r_symndx
,
5608 ELF_R_TYPE (irela
->r_info
));
5611 /* Swap out the relocs. */
5612 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5613 elf_link_output_relocs (output_bfd
, o
,
5617 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5618 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5620 elf_link_output_relocs (output_bfd
, o
,
5626 /* Write out the modified section contents. */
5627 if (elf_section_data (o
)->stab_info
== NULL
)
5629 if (! (o
->flags
& SEC_EXCLUDE
) &&
5630 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5631 contents
, o
->output_offset
,
5632 (o
->_cooked_size
!= 0
5639 if (! (_bfd_write_section_stabs
5640 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5641 o
, &elf_section_data (o
)->stab_info
, contents
)))
5649 /* Generate a reloc when linking an ELF file. This is a reloc
5650 requested by the linker, and does come from any input file. This
5651 is used to build constructor and destructor tables when linking
5655 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5657 struct bfd_link_info
*info
;
5658 asection
*output_section
;
5659 struct bfd_link_order
*link_order
;
5661 reloc_howto_type
*howto
;
5665 struct elf_link_hash_entry
**rel_hash_ptr
;
5666 Elf_Internal_Shdr
*rel_hdr
;
5668 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5671 bfd_set_error (bfd_error_bad_value
);
5675 addend
= link_order
->u
.reloc
.p
->addend
;
5677 /* Figure out the symbol index. */
5678 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5679 + elf_section_data (output_section
)->rel_count
5680 + elf_section_data (output_section
)->rel_count2
);
5681 if (link_order
->type
== bfd_section_reloc_link_order
)
5683 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5684 BFD_ASSERT (indx
!= 0);
5685 *rel_hash_ptr
= NULL
;
5689 struct elf_link_hash_entry
*h
;
5691 /* Treat a reloc against a defined symbol as though it were
5692 actually against the section. */
5693 h
= ((struct elf_link_hash_entry
*)
5694 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5695 link_order
->u
.reloc
.p
->u
.name
,
5696 false, false, true));
5698 && (h
->root
.type
== bfd_link_hash_defined
5699 || h
->root
.type
== bfd_link_hash_defweak
))
5703 section
= h
->root
.u
.def
.section
;
5704 indx
= section
->output_section
->target_index
;
5705 *rel_hash_ptr
= NULL
;
5706 /* It seems that we ought to add the symbol value to the
5707 addend here, but in practice it has already been added
5708 because it was passed to constructor_callback. */
5709 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5713 /* Setting the index to -2 tells elf_link_output_extsym that
5714 this symbol is used by a reloc. */
5721 if (! ((*info
->callbacks
->unattached_reloc
)
5722 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5723 (asection
*) NULL
, (bfd_vma
) 0)))
5729 /* If this is an inplace reloc, we must write the addend into the
5731 if (howto
->partial_inplace
&& addend
!= 0)
5734 bfd_reloc_status_type rstat
;
5738 size
= bfd_get_reloc_size (howto
);
5739 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5740 if (buf
== (bfd_byte
*) NULL
)
5742 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5748 case bfd_reloc_outofrange
:
5750 case bfd_reloc_overflow
:
5751 if (! ((*info
->callbacks
->reloc_overflow
)
5753 (link_order
->type
== bfd_section_reloc_link_order
5754 ? bfd_section_name (output_bfd
,
5755 link_order
->u
.reloc
.p
->u
.section
)
5756 : link_order
->u
.reloc
.p
->u
.name
),
5757 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5765 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5766 (file_ptr
) link_order
->offset
, size
);
5772 /* The address of a reloc is relative to the section in a
5773 relocateable file, and is a virtual address in an executable
5775 offset
= link_order
->offset
;
5776 if (! info
->relocateable
)
5777 offset
+= output_section
->vma
;
5779 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5781 if (rel_hdr
->sh_type
== SHT_REL
)
5783 Elf_Internal_Rel irel
;
5784 Elf_External_Rel
*erel
;
5786 irel
.r_offset
= offset
;
5787 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5788 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5789 + elf_section_data (output_section
)->rel_count
);
5790 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5794 Elf_Internal_Rela irela
;
5795 Elf_External_Rela
*erela
;
5797 irela
.r_offset
= offset
;
5798 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5799 irela
.r_addend
= addend
;
5800 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5801 + elf_section_data (output_section
)->rel_count
);
5802 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5805 ++elf_section_data (output_section
)->rel_count
;
5811 /* Allocate a pointer to live in a linker created section. */
5814 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5816 struct bfd_link_info
*info
;
5817 elf_linker_section_t
*lsect
;
5818 struct elf_link_hash_entry
*h
;
5819 const Elf_Internal_Rela
*rel
;
5821 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5822 elf_linker_section_pointers_t
*linker_section_ptr
;
5823 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5825 BFD_ASSERT (lsect
!= NULL
);
5827 /* Is this a global symbol? */
5830 /* Has this symbol already been allocated, if so, our work is done */
5831 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5836 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5837 /* Make sure this symbol is output as a dynamic symbol. */
5838 if (h
->dynindx
== -1)
5840 if (! elf_link_record_dynamic_symbol (info
, h
))
5844 if (lsect
->rel_section
)
5845 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5848 else /* Allocation of a pointer to a local symbol */
5850 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5852 /* Allocate a table to hold the local symbols if first time */
5855 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5856 register unsigned int i
;
5858 ptr
= (elf_linker_section_pointers_t
**)
5859 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5864 elf_local_ptr_offsets (abfd
) = ptr
;
5865 for (i
= 0; i
< num_symbols
; i
++)
5866 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5869 /* Has this symbol already been allocated, if so, our work is done */
5870 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5875 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5879 /* If we are generating a shared object, we need to
5880 output a R_<xxx>_RELATIVE reloc so that the
5881 dynamic linker can adjust this GOT entry. */
5882 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5883 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5887 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5888 from internal memory. */
5889 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5890 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5891 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5893 if (!linker_section_ptr
)
5896 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5897 linker_section_ptr
->addend
= rel
->r_addend
;
5898 linker_section_ptr
->which
= lsect
->which
;
5899 linker_section_ptr
->written_address_p
= false;
5900 *ptr_linker_section_ptr
= linker_section_ptr
;
5903 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5905 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5906 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5907 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5908 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5910 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5912 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5913 lsect
->sym_hash
->root
.root
.string
,
5914 (long)ARCH_SIZE
/ 8,
5915 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5921 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5923 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5926 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5927 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5935 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5938 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5941 /* Fill in the address for a pointer generated in alinker section. */
5944 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5947 struct bfd_link_info
*info
;
5948 elf_linker_section_t
*lsect
;
5949 struct elf_link_hash_entry
*h
;
5951 const Elf_Internal_Rela
*rel
;
5954 elf_linker_section_pointers_t
*linker_section_ptr
;
5956 BFD_ASSERT (lsect
!= NULL
);
5958 if (h
!= NULL
) /* global symbol */
5960 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5964 BFD_ASSERT (linker_section_ptr
!= NULL
);
5966 if (! elf_hash_table (info
)->dynamic_sections_created
5969 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5971 /* This is actually a static link, or it is a
5972 -Bsymbolic link and the symbol is defined
5973 locally. We must initialize this entry in the
5976 When doing a dynamic link, we create a .rela.<xxx>
5977 relocation entry to initialize the value. This
5978 is done in the finish_dynamic_symbol routine. */
5979 if (!linker_section_ptr
->written_address_p
)
5981 linker_section_ptr
->written_address_p
= true;
5982 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5983 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5987 else /* local symbol */
5989 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5990 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5991 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5992 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5996 BFD_ASSERT (linker_section_ptr
!= NULL
);
5998 /* Write out pointer if it hasn't been rewritten out before */
5999 if (!linker_section_ptr
->written_address_p
)
6001 linker_section_ptr
->written_address_p
= true;
6002 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
6003 lsect
->section
->contents
+ linker_section_ptr
->offset
);
6007 asection
*srel
= lsect
->rel_section
;
6008 Elf_Internal_Rela outrel
;
6010 /* We need to generate a relative reloc for the dynamic linker. */
6012 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
6015 BFD_ASSERT (srel
!= NULL
);
6017 outrel
.r_offset
= (lsect
->section
->output_section
->vma
6018 + lsect
->section
->output_offset
6019 + linker_section_ptr
->offset
);
6020 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
6021 outrel
.r_addend
= 0;
6022 elf_swap_reloca_out (output_bfd
, &outrel
,
6023 (((Elf_External_Rela
*)
6024 lsect
->section
->contents
)
6025 + elf_section_data (lsect
->section
)->rel_count
));
6026 ++elf_section_data (lsect
->section
)->rel_count
;
6031 relocation
= (lsect
->section
->output_offset
6032 + linker_section_ptr
->offset
6033 - lsect
->hole_offset
6034 - lsect
->sym_offset
);
6037 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
6038 lsect
->name
, (long)relocation
, (long)relocation
);
6041 /* Subtract out the addend, because it will get added back in by the normal
6043 return relocation
- linker_section_ptr
->addend
;
6046 /* Garbage collect unused sections. */
6048 static boolean elf_gc_mark
6049 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
6050 asection
* (*gc_mark_hook
)
6051 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6052 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
6054 static boolean elf_gc_sweep
6055 PARAMS ((struct bfd_link_info
*info
,
6056 boolean (*gc_sweep_hook
)
6057 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6058 const Elf_Internal_Rela
*relocs
))));
6060 static boolean elf_gc_sweep_symbol
6061 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
6063 static boolean elf_gc_allocate_got_offsets
6064 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
6066 static boolean elf_gc_propagate_vtable_entries_used
6067 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6069 static boolean elf_gc_smash_unused_vtentry_relocs
6070 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
6072 /* The mark phase of garbage collection. For a given section, mark
6073 it, and all the sections which define symbols to which it refers. */
6076 elf_gc_mark (info
, sec
, gc_mark_hook
)
6077 struct bfd_link_info
*info
;
6079 asection
* (*gc_mark_hook
)
6080 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6081 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
6087 /* Look through the section relocs. */
6089 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
6091 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
6092 Elf_Internal_Shdr
*symtab_hdr
;
6093 struct elf_link_hash_entry
**sym_hashes
;
6096 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
6097 bfd
*input_bfd
= sec
->owner
;
6098 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
6100 /* GCFIXME: how to arrange so that relocs and symbols are not
6101 reread continually? */
6103 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6104 sym_hashes
= elf_sym_hashes (input_bfd
);
6106 /* Read the local symbols. */
6107 if (elf_bad_symtab (input_bfd
))
6109 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6113 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
6114 if (symtab_hdr
->contents
)
6115 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6116 else if (nlocsyms
== 0)
6120 locsyms
= freesyms
=
6121 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
6122 if (freesyms
== NULL
6123 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6124 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
6125 nlocsyms
, input_bfd
)
6126 != nlocsyms
* sizeof (Elf_External_Sym
)))
6133 /* Read the relocations. */
6134 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6135 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
6136 info
->keep_memory
));
6137 if (relstart
== NULL
)
6142 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6144 for (rel
= relstart
; rel
< relend
; rel
++)
6146 unsigned long r_symndx
;
6148 struct elf_link_hash_entry
*h
;
6151 r_symndx
= ELF_R_SYM (rel
->r_info
);
6155 if (elf_bad_symtab (sec
->owner
))
6157 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6158 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
6159 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6162 h
= sym_hashes
[r_symndx
- extsymoff
];
6163 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6166 else if (r_symndx
>= nlocsyms
)
6168 h
= sym_hashes
[r_symndx
- extsymoff
];
6169 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6173 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6174 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6177 if (rsec
&& !rsec
->gc_mark
)
6178 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6186 if (!info
->keep_memory
)
6196 /* The sweep phase of garbage collection. Remove all garbage sections. */
6199 elf_gc_sweep (info
, gc_sweep_hook
)
6200 struct bfd_link_info
*info
;
6201 boolean (*gc_sweep_hook
)
6202 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6203 const Elf_Internal_Rela
*relocs
));
6207 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6211 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6214 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6216 /* Keep special sections. Keep .debug sections. */
6217 if ((o
->flags
& SEC_LINKER_CREATED
)
6218 || (o
->flags
& SEC_DEBUGGING
))
6224 /* Skip sweeping sections already excluded. */
6225 if (o
->flags
& SEC_EXCLUDE
)
6228 /* Since this is early in the link process, it is simple
6229 to remove a section from the output. */
6230 o
->flags
|= SEC_EXCLUDE
;
6232 /* But we also have to update some of the relocation
6233 info we collected before. */
6235 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6237 Elf_Internal_Rela
*internal_relocs
;
6240 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6241 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6242 if (internal_relocs
== NULL
)
6245 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6247 if (!info
->keep_memory
)
6248 free (internal_relocs
);
6256 /* Remove the symbols that were in the swept sections from the dynamic
6257 symbol table. GCFIXME: Anyone know how to get them out of the
6258 static symbol table as well? */
6262 elf_link_hash_traverse (elf_hash_table (info
),
6263 elf_gc_sweep_symbol
,
6266 elf_hash_table (info
)->dynsymcount
= i
;
6272 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6275 elf_gc_sweep_symbol (h
, idxptr
)
6276 struct elf_link_hash_entry
*h
;
6279 int *idx
= (int *) idxptr
;
6281 if (h
->dynindx
!= -1
6282 && ((h
->root
.type
!= bfd_link_hash_defined
6283 && h
->root
.type
!= bfd_link_hash_defweak
)
6284 || h
->root
.u
.def
.section
->gc_mark
))
6285 h
->dynindx
= (*idx
)++;
6290 /* Propogate collected vtable information. This is called through
6291 elf_link_hash_traverse. */
6294 elf_gc_propagate_vtable_entries_used (h
, okp
)
6295 struct elf_link_hash_entry
*h
;
6298 /* Those that are not vtables. */
6299 if (h
->vtable_parent
== NULL
)
6302 /* Those vtables that do not have parents, we cannot merge. */
6303 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6306 /* If we've already been done, exit. */
6307 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6310 /* Make sure the parent's table is up to date. */
6311 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6313 if (h
->vtable_entries_used
== NULL
)
6315 /* None of this table's entries were referenced. Re-use the
6317 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6318 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6325 /* Or the parent's entries into ours. */
6326 cu
= h
->vtable_entries_used
;
6328 pu
= h
->vtable_parent
->vtable_entries_used
;
6331 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6334 if (*pu
) *cu
= true;
6344 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6345 struct elf_link_hash_entry
*h
;
6349 bfd_vma hstart
, hend
;
6350 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6351 struct elf_backend_data
*bed
;
6353 /* Take care of both those symbols that do not describe vtables as
6354 well as those that are not loaded. */
6355 if (h
->vtable_parent
== NULL
)
6358 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6359 || h
->root
.type
== bfd_link_hash_defweak
);
6361 sec
= h
->root
.u
.def
.section
;
6362 hstart
= h
->root
.u
.def
.value
;
6363 hend
= hstart
+ h
->size
;
6365 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6366 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6368 return *(boolean
*)okp
= false;
6369 bed
= get_elf_backend_data (sec
->owner
);
6370 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6372 for (rel
= relstart
; rel
< relend
; ++rel
)
6373 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6375 /* If the entry is in use, do nothing. */
6376 if (h
->vtable_entries_used
6377 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6379 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6380 if (h
->vtable_entries_used
[entry
])
6383 /* Otherwise, kill it. */
6384 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6390 /* Do mark and sweep of unused sections. */
6393 elf_gc_sections (abfd
, info
)
6395 struct bfd_link_info
*info
;
6399 asection
* (*gc_mark_hook
)
6400 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6401 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6403 if (!get_elf_backend_data (abfd
)->can_gc_sections
6404 || info
->relocateable
6405 || elf_hash_table (info
)->dynamic_sections_created
)
6408 /* Apply transitive closure to the vtable entry usage info. */
6409 elf_link_hash_traverse (elf_hash_table (info
),
6410 elf_gc_propagate_vtable_entries_used
,
6415 /* Kill the vtable relocations that were not used. */
6416 elf_link_hash_traverse (elf_hash_table (info
),
6417 elf_gc_smash_unused_vtentry_relocs
,
6422 /* Grovel through relocs to find out who stays ... */
6424 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6425 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6429 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
6432 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6434 if (o
->flags
& SEC_KEEP
)
6435 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6440 /* ... and mark SEC_EXCLUDE for those that go. */
6441 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6447 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6450 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6453 struct elf_link_hash_entry
*h
;
6456 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6457 struct elf_link_hash_entry
**search
, *child
;
6458 bfd_size_type extsymcount
;
6460 /* The sh_info field of the symtab header tells us where the
6461 external symbols start. We don't care about the local symbols at
6463 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6464 if (!elf_bad_symtab (abfd
))
6465 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6467 sym_hashes
= elf_sym_hashes (abfd
);
6468 sym_hashes_end
= sym_hashes
+ extsymcount
;
6470 /* Hunt down the child symbol, which is in this section at the same
6471 offset as the relocation. */
6472 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6474 if ((child
= *search
) != NULL
6475 && (child
->root
.type
== bfd_link_hash_defined
6476 || child
->root
.type
== bfd_link_hash_defweak
)
6477 && child
->root
.u
.def
.section
== sec
6478 && child
->root
.u
.def
.value
== offset
)
6482 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6483 bfd_get_filename (abfd
), sec
->name
,
6484 (unsigned long)offset
);
6485 bfd_set_error (bfd_error_invalid_operation
);
6491 /* This *should* only be the absolute section. It could potentially
6492 be that someone has defined a non-global vtable though, which
6493 would be bad. It isn't worth paging in the local symbols to be
6494 sure though; that case should simply be handled by the assembler. */
6496 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6499 child
->vtable_parent
= h
;
6504 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6507 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6508 bfd
*abfd ATTRIBUTE_UNUSED
;
6509 asection
*sec ATTRIBUTE_UNUSED
;
6510 struct elf_link_hash_entry
*h
;
6513 if (addend
>= h
->vtable_entries_size
)
6516 boolean
*ptr
= h
->vtable_entries_used
;
6518 /* While the symbol is undefined, we have to be prepared to handle
6520 if (h
->root
.type
== bfd_link_hash_undefined
)
6527 /* Oops! We've got a reference past the defined end of
6528 the table. This is probably a bug -- shall we warn? */
6533 /* Allocate one extra entry for use as a "done" flag for the
6534 consolidation pass. */
6535 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof (boolean
);
6539 ptr
= bfd_realloc (ptr
- 1, bytes
);
6545 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof (boolean
);
6546 memset (((char *)ptr
) + oldbytes
, 0, bytes
- oldbytes
);
6550 ptr
= bfd_zmalloc (bytes
);
6555 /* And arrange for that done flag to be at index -1. */
6556 h
->vtable_entries_used
= ptr
+ 1;
6557 h
->vtable_entries_size
= size
;
6560 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6565 /* And an accompanying bit to work out final got entry offsets once
6566 we're done. Should be called from final_link. */
6569 elf_gc_common_finalize_got_offsets (abfd
, info
)
6571 struct bfd_link_info
*info
;
6574 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6577 /* The GOT offset is relative to the .got section, but the GOT header is
6578 put into the .got.plt section, if the backend uses it. */
6579 if (bed
->want_got_plt
)
6582 gotoff
= bed
->got_header_size
;
6584 /* Do the local .got entries first. */
6585 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6587 bfd_signed_vma
*local_got
;
6588 bfd_size_type j
, locsymcount
;
6589 Elf_Internal_Shdr
*symtab_hdr
;
6591 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
6594 local_got
= elf_local_got_refcounts (i
);
6598 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6599 if (elf_bad_symtab (i
))
6600 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6602 locsymcount
= symtab_hdr
->sh_info
;
6604 for (j
= 0; j
< locsymcount
; ++j
)
6606 if (local_got
[j
] > 0)
6608 local_got
[j
] = gotoff
;
6609 gotoff
+= ARCH_SIZE
/ 8;
6612 local_got
[j
] = (bfd_vma
) -1;
6616 /* Then the global .got and .plt entries. */
6617 elf_link_hash_traverse (elf_hash_table (info
),
6618 elf_gc_allocate_got_offsets
,
6623 /* We need a special top-level link routine to convert got reference counts
6624 to real got offsets. */
6627 elf_gc_allocate_got_offsets (h
, offarg
)
6628 struct elf_link_hash_entry
*h
;
6631 bfd_vma
*off
= (bfd_vma
*) offarg
;
6633 if (h
->got
.refcount
> 0)
6635 h
->got
.offset
= off
[0];
6636 off
[0] += ARCH_SIZE
/ 8;
6639 h
->got
.offset
= (bfd_vma
) -1;
6644 /* Many folk need no more in the way of final link than this, once
6645 got entry reference counting is enabled. */
6648 elf_gc_common_final_link (abfd
, info
)
6650 struct bfd_link_info
*info
;
6652 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6655 /* Invoke the regular ELF backend linker to do all the work. */
6656 return elf_bfd_final_link (abfd
, info
);
6659 /* This function will be called though elf_link_hash_traverse to store
6660 all hash value of the exported symbols in an array. */
6663 elf_collect_hash_codes (h
, data
)
6664 struct elf_link_hash_entry
*h
;
6667 unsigned long **valuep
= (unsigned long **) data
;
6673 /* Ignore indirect symbols. These are added by the versioning code. */
6674 if (h
->dynindx
== -1)
6677 name
= h
->root
.root
.string
;
6678 p
= strchr (name
, ELF_VER_CHR
);
6681 alc
= bfd_malloc (p
- name
+ 1);
6682 memcpy (alc
, name
, p
- name
);
6683 alc
[p
- name
] = '\0';
6687 /* Compute the hash value. */
6688 ha
= bfd_elf_hash (name
);
6690 /* Store the found hash value in the array given as the argument. */
6693 /* And store it in the struct so that we can put it in the hash table
6695 h
->elf_hash_value
= ha
;