2 Copyright 1995, 1996 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 static boolean elf_link_add_object_symbols
23 PARAMS ((bfd
*, struct bfd_link_info
*));
24 static boolean elf_link_add_archive_symbols
25 PARAMS ((bfd
*, struct bfd_link_info
*));
26 static Elf_Internal_Rela
*elf_link_read_relocs
27 PARAMS ((bfd
*, asection
*, PTR
, Elf_Internal_Rela
*, boolean
));
28 static boolean elf_export_symbol
29 PARAMS ((struct elf_link_hash_entry
*, PTR
));
30 static boolean elf_adjust_dynamic_symbol
31 PARAMS ((struct elf_link_hash_entry
*, PTR
));
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
39 struct bfd_link_info
*info
;
42 /* Given an ELF BFD, add symbols to the global hash table as
46 elf_bfd_link_add_symbols (abfd
, info
)
48 struct bfd_link_info
*info
;
50 switch (bfd_get_format (abfd
))
53 return elf_link_add_object_symbols (abfd
, info
);
55 return elf_link_add_archive_symbols (abfd
, info
);
57 bfd_set_error (bfd_error_wrong_format
);
63 /* Add symbols from an ELF archive file to the linker hash table. We
64 don't use _bfd_generic_link_add_archive_symbols because of a
65 problem which arises on UnixWare. The UnixWare libc.so is an
66 archive which includes an entry libc.so.1 which defines a bunch of
67 symbols. The libc.so archive also includes a number of other
68 object files, which also define symbols, some of which are the same
69 as those defined in libc.so.1. Correct linking requires that we
70 consider each object file in turn, and include it if it defines any
71 symbols we need. _bfd_generic_link_add_archive_symbols does not do
72 this; it looks through the list of undefined symbols, and includes
73 any object file which defines them. When this algorithm is used on
74 UnixWare, it winds up pulling in libc.so.1 early and defining a
75 bunch of symbols. This means that some of the other objects in the
76 archive are not included in the link, which is incorrect since they
77 precede libc.so.1 in the archive.
79 Fortunately, ELF archive handling is simpler than that done by
80 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
81 oddities. In ELF, if we find a symbol in the archive map, and the
82 symbol is currently undefined, we know that we must pull in that
85 Unfortunately, we do have to make multiple passes over the symbol
86 table until nothing further is resolved. */
89 elf_link_add_archive_symbols (abfd
, info
)
91 struct bfd_link_info
*info
;
94 boolean
*defined
= NULL
;
95 boolean
*included
= NULL
;
99 if (! bfd_has_map (abfd
))
101 /* An empty archive is a special case. */
102 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
104 bfd_set_error (bfd_error_no_armap
);
108 /* Keep track of all symbols we know to be already defined, and all
109 files we know to be already included. This is to speed up the
110 second and subsequent passes. */
111 c
= bfd_ardata (abfd
)->symdef_count
;
114 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
115 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
116 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
118 memset (defined
, 0, c
* sizeof (boolean
));
119 memset (included
, 0, c
* sizeof (boolean
));
121 symdefs
= bfd_ardata (abfd
)->symdefs
;
134 symdefend
= symdef
+ c
;
135 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
137 struct elf_link_hash_entry
*h
;
139 struct bfd_link_hash_entry
*undefs_tail
;
142 if (defined
[i
] || included
[i
])
144 if (symdef
->file_offset
== last
)
150 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
151 false, false, false);
152 if (h
== (struct elf_link_hash_entry
*) NULL
)
154 if (h
->root
.type
!= bfd_link_hash_undefined
)
156 if (h
->root
.type
!= bfd_link_hash_undefweak
)
161 /* We need to include this archive member. */
163 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
164 if (element
== (bfd
*) NULL
)
167 if (! bfd_check_format (element
, bfd_object
))
170 /* Doublecheck that we have not included this object
171 already--it should be impossible, but there may be
172 something wrong with the archive. */
173 if (element
->archive_pass
!= 0)
175 bfd_set_error (bfd_error_bad_value
);
178 element
->archive_pass
= 1;
180 undefs_tail
= info
->hash
->undefs_tail
;
182 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
185 if (! elf_link_add_object_symbols (element
, info
))
188 /* If there are any new undefined symbols, we need to make
189 another pass through the archive in order to see whether
190 they can be defined. FIXME: This isn't perfect, because
191 common symbols wind up on undefs_tail and because an
192 undefined symbol which is defined later on in this pass
193 does not require another pass. This isn't a bug, but it
194 does make the code less efficient than it could be. */
195 if (undefs_tail
!= info
->hash
->undefs_tail
)
198 /* Look backward to mark all symbols from this object file
199 which we have already seen in this pass. */
203 included
[mark
] = true;
208 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
210 /* We mark subsequent symbols from this object file as we go
211 on through the loop. */
212 last
= symdef
->file_offset
;
223 if (defined
!= (boolean
*) NULL
)
225 if (included
!= (boolean
*) NULL
)
230 /* Add symbols from an ELF object file to the linker hash table. */
233 elf_link_add_object_symbols (abfd
, info
)
235 struct bfd_link_info
*info
;
237 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
238 const Elf_Internal_Sym
*,
239 const char **, flagword
*,
240 asection
**, bfd_vma
*));
241 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
242 asection
*, const Elf_Internal_Rela
*));
244 Elf_Internal_Shdr
*hdr
;
248 Elf_External_Sym
*buf
= NULL
;
249 struct elf_link_hash_entry
**sym_hash
;
251 Elf_External_Dyn
*dynbuf
= NULL
;
252 struct elf_link_hash_entry
*weaks
;
253 Elf_External_Sym
*esym
;
254 Elf_External_Sym
*esymend
;
256 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
257 collect
= get_elf_backend_data (abfd
)->collect
;
259 /* As a GNU extension, any input sections which are named
260 .gnu.warning.SYMBOL are treated as warning symbols for the given
261 symbol. This differs from .gnu.warning sections, which generate
262 warnings when they are included in an output file. */
267 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
271 name
= bfd_get_section_name (abfd
, s
);
272 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
277 sz
= bfd_section_size (abfd
, s
);
278 msg
= (char *) bfd_alloc (abfd
, sz
);
282 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
285 if (! (_bfd_generic_link_add_one_symbol
287 name
+ sizeof ".gnu.warning." - 1,
288 BSF_WARNING
, s
, (bfd_vma
) 0, msg
, false, collect
,
289 (struct bfd_link_hash_entry
**) NULL
)))
292 if (! info
->relocateable
)
294 /* Clobber the section size so that the warning does
295 not get copied into the output file. */
302 /* A stripped shared library might only have a dynamic symbol table,
303 not a regular symbol table. In that case we can still go ahead
304 and link using the dynamic symbol table. */
305 if (elf_onesymtab (abfd
) == 0
306 && elf_dynsymtab (abfd
) != 0)
308 elf_onesymtab (abfd
) = elf_dynsymtab (abfd
);
309 elf_tdata (abfd
)->symtab_hdr
= elf_tdata (abfd
)->dynsymtab_hdr
;
312 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
313 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
315 /* The sh_info field of the symtab header tells us where the
316 external symbols start. We don't care about the local symbols at
318 if (elf_bad_symtab (abfd
))
320 extsymcount
= symcount
;
325 extsymcount
= symcount
- hdr
->sh_info
;
326 extsymoff
= hdr
->sh_info
;
329 buf
= ((Elf_External_Sym
*)
330 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
331 if (buf
== NULL
&& extsymcount
!= 0)
334 /* We store a pointer to the hash table entry for each external
336 sym_hash
= ((struct elf_link_hash_entry
**)
338 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
339 if (sym_hash
== NULL
)
341 elf_sym_hashes (abfd
) = sym_hash
;
343 if (elf_elfheader (abfd
)->e_type
!= ET_DYN
)
347 /* If we are creating a shared library, create all the dynamic
348 sections immediately. We need to attach them to something,
349 so we attach them to this BFD, provided it is the right
350 format. FIXME: If there are no input BFD's of the same
351 format as the output, we can't make a shared library. */
353 && ! elf_hash_table (info
)->dynamic_sections_created
354 && abfd
->xvec
== info
->hash
->creator
)
356 if (! elf_link_create_dynamic_sections (abfd
, info
))
365 bfd_size_type oldsize
;
366 bfd_size_type strindex
;
370 /* You can't use -r against a dynamic object. Also, there's no
371 hope of using a dynamic object which does not exactly match
372 the format of the output file. */
373 if (info
->relocateable
374 || info
->hash
->creator
!= abfd
->xvec
)
376 bfd_set_error (bfd_error_invalid_operation
);
380 /* Find the name to use in a DT_NEEDED entry that refers to this
381 object. If the object has a DT_SONAME entry, we use it.
382 Otherwise, if the generic linker stuck something in
383 elf_dt_needed_name, we use that. Otherwise, we just use the
384 file name. If the generic linker put a null string into
385 elf_dt_needed_name, we don't make a DT_NEEDED entry at all,
386 even if there is a DT_SONAME entry. */
388 name
= bfd_get_filename (abfd
);
389 if (elf_dt_needed_name (abfd
) != NULL
)
391 name
= elf_dt_needed_name (abfd
);
395 s
= bfd_get_section_by_name (abfd
, ".dynamic");
398 Elf_External_Dyn
*extdyn
;
399 Elf_External_Dyn
*extdynend
;
403 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
407 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
408 (file_ptr
) 0, s
->_raw_size
))
411 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
414 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
417 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
418 for (; extdyn
< extdynend
; extdyn
++)
420 Elf_Internal_Dyn dyn
;
422 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
423 if (add_needed
&& dyn
.d_tag
== DT_SONAME
)
425 name
= bfd_elf_string_from_elf_section (abfd
, link
,
430 if (dyn
.d_tag
== DT_NEEDED
)
432 struct bfd_link_needed_list
*n
, **pn
;
435 n
= ((struct bfd_link_needed_list
*)
436 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
437 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
439 if (n
== NULL
|| fnm
== NULL
)
441 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
448 for (pn
= &elf_hash_table (info
)->needed
;
460 /* We do not want to include any of the sections in a dynamic
461 object in the output file. We hack by simply clobbering the
462 list of sections in the BFD. This could be handled more
463 cleanly by, say, a new section flag; the existing
464 SEC_NEVER_LOAD flag is not the one we want, because that one
465 still implies that the section takes up space in the output
467 abfd
->sections
= NULL
;
468 abfd
->section_count
= 0;
470 /* If this is the first dynamic object found in the link, create
471 the special sections required for dynamic linking. */
472 if (! elf_hash_table (info
)->dynamic_sections_created
)
474 if (! elf_link_create_dynamic_sections (abfd
, info
))
480 /* Add a DT_NEEDED entry for this dynamic object. */
481 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
482 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
484 if (strindex
== (bfd_size_type
) -1)
487 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
490 Elf_External_Dyn
*dyncon
, *dynconend
;
492 /* The hash table size did not change, which means that
493 the dynamic object name was already entered. If we
494 have already included this dynamic object in the
495 link, just ignore it. There is no reason to include
496 a particular dynamic object more than once. */
497 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
499 BFD_ASSERT (sdyn
!= NULL
);
501 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
502 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
504 for (; dyncon
< dynconend
; dyncon
++)
506 Elf_Internal_Dyn dyn
;
508 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
510 if (dyn
.d_tag
== DT_NEEDED
511 && dyn
.d_un
.d_val
== strindex
)
520 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
526 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
528 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
529 != extsymcount
* sizeof (Elf_External_Sym
)))
534 esymend
= buf
+ extsymcount
;
535 for (esym
= buf
; esym
< esymend
; esym
++, sym_hash
++)
537 Elf_Internal_Sym sym
;
543 struct elf_link_hash_entry
*h
;
545 boolean size_change_ok
, type_change_ok
;
548 elf_swap_symbol_in (abfd
, esym
, &sym
);
550 flags
= BSF_NO_FLAGS
;
552 value
= sym
.st_value
;
555 bind
= ELF_ST_BIND (sym
.st_info
);
556 if (bind
== STB_LOCAL
)
558 /* This should be impossible, since ELF requires that all
559 global symbols follow all local symbols, and that sh_info
560 point to the first global symbol. Unfortunatealy, Irix 5
564 else if (bind
== STB_GLOBAL
)
566 if (sym
.st_shndx
!= SHN_UNDEF
567 && sym
.st_shndx
!= SHN_COMMON
)
572 else if (bind
== STB_WEAK
)
576 /* Leave it up to the processor backend. */
579 if (sym
.st_shndx
== SHN_UNDEF
)
580 sec
= bfd_und_section_ptr
;
581 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
583 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
587 sec
= bfd_abs_section_ptr
;
589 else if (sym
.st_shndx
== SHN_ABS
)
590 sec
= bfd_abs_section_ptr
;
591 else if (sym
.st_shndx
== SHN_COMMON
)
593 sec
= bfd_com_section_ptr
;
594 /* What ELF calls the size we call the value. What ELF
595 calls the value we call the alignment. */
600 /* Leave it up to the processor backend. */
603 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
604 if (name
== (const char *) NULL
)
609 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
613 /* The hook function sets the name to NULL if this symbol
614 should be skipped for some reason. */
615 if (name
== (const char *) NULL
)
619 /* Sanity check that all possibilities were handled. */
620 if (sec
== (asection
*) NULL
)
622 bfd_set_error (bfd_error_bad_value
);
626 if (bfd_is_und_section (sec
)
627 || bfd_is_com_section (sec
))
632 size_change_ok
= false;
633 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
634 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
636 /* We need to look up the symbol now in order to get some of
637 the dynamic object handling right. We pass the hash
638 table entry in to _bfd_generic_link_add_one_symbol so
639 that it does not have to look it up again. */
640 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
646 while (h
->root
.type
== bfd_link_hash_indirect
647 || h
->root
.type
== bfd_link_hash_warning
)
648 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
650 /* It's OK to change the type if it used to be a weak
652 if (h
->root
.type
== bfd_link_hash_defweak
653 || h
->root
.type
== bfd_link_hash_undefweak
)
654 type_change_ok
= true;
656 /* It's OK to change the size if it used to be a weak
657 definition, or if it used to be undefined, or if we will
658 be overriding an old definition. */
660 || h
->root
.type
== bfd_link_hash_undefined
)
661 size_change_ok
= true;
663 /* If we are looking at a dynamic object, and this is a
664 definition, we need to see if it has already been defined
665 by some other object. If it has, we want to use the
666 existing definition, and we do not want to report a
667 multiple symbol definition error; we do this by
668 clobbering sec to be bfd_und_section_ptr. */
669 if (dynamic
&& definition
)
671 if (h
->root
.type
== bfd_link_hash_defined
672 || h
->root
.type
== bfd_link_hash_defweak
673 || (h
->root
.type
== bfd_link_hash_common
674 && bind
== STB_WEAK
))
676 sec
= bfd_und_section_ptr
;
678 size_change_ok
= true;
682 /* Similarly, if we are not looking at a dynamic object, and
683 we have a definition, we want to override any definition
684 we may have from a dynamic object. Symbols from regular
685 files always take precedence over symbols from dynamic
686 objects, even if they are defined after the dynamic
687 object in the link. */
690 && (h
->root
.type
== bfd_link_hash_defined
691 || h
->root
.type
== bfd_link_hash_defweak
)
692 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
693 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
694 == bfd_target_elf_flavour
)
695 && (elf_elfheader (h
->root
.u
.def
.section
->owner
)->e_type
698 /* Change the hash table entry to undefined, and let
699 _bfd_generic_link_add_one_symbol do the right thing
700 with the new definition. */
701 h
->root
.type
= bfd_link_hash_undefined
;
702 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
703 size_change_ok
= true;
707 if (! (_bfd_generic_link_add_one_symbol
708 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
709 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
713 while (h
->root
.type
== bfd_link_hash_indirect
714 || h
->root
.type
== bfd_link_hash_warning
)
715 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
721 && (flags
& BSF_WEAK
) != 0
722 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
723 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
724 && h
->weakdef
== NULL
)
726 /* Keep a list of all weak defined non function symbols from
727 a dynamic object, using the weakdef field. Later in this
728 function we will set the weakdef field to the correct
729 value. We only put non-function symbols from dynamic
730 objects on this list, because that happens to be the only
731 time we need to know the normal symbol corresponding to a
732 weak symbol, and the information is time consuming to
733 figure out. If the weakdef field is not already NULL,
734 then this symbol was already defined by some previous
735 dynamic object, and we will be using that previous
736 definition anyhow. */
743 /* Get the alignment of a common symbol. */
744 if (sym
.st_shndx
== SHN_COMMON
745 && h
->root
.type
== bfd_link_hash_common
)
746 h
->root
.u
.c
.p
->alignment_power
= bfd_log2 (sym
.st_value
);
748 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
754 /* Remember the symbol size and type. */
756 && (definition
|| h
->size
== 0))
758 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
759 (*_bfd_error_handler
)
760 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
761 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
762 bfd_get_filename (abfd
));
764 h
->size
= sym
.st_size
;
766 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
767 && (definition
|| h
->type
== STT_NOTYPE
))
769 if (h
->type
!= STT_NOTYPE
770 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
772 (*_bfd_error_handler
)
773 ("Warning: type of symbol `%s' changed from %d to %d in %s",
774 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
775 bfd_get_filename (abfd
));
777 h
->type
= ELF_ST_TYPE (sym
.st_info
);
780 /* Set a flag in the hash table entry indicating the type of
781 reference or definition we just found. Keep a count of
782 the number of dynamic symbols we find. A dynamic symbol
783 is one which is referenced or defined by both a regular
784 object and a shared object, or one which is referenced or
785 defined by more than one shared object. */
786 old_flags
= h
->elf_link_hash_flags
;
791 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
793 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
795 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
796 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
802 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
804 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
805 if ((old_flags
& new_flag
) != 0
806 || (old_flags
& (ELF_LINK_HASH_DEF_REGULAR
807 | ELF_LINK_HASH_REF_REGULAR
)) != 0
808 || (h
->weakdef
!= NULL
809 && (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
810 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0))
814 h
->elf_link_hash_flags
|= new_flag
;
815 if (dynsym
&& h
->dynindx
== -1)
817 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
819 if (h
->weakdef
!= NULL
821 && h
->weakdef
->dynindx
== -1)
823 if (! _bfd_elf_link_record_dynamic_symbol (info
,
831 /* Now set the weakdefs field correctly for all the weak defined
832 symbols we found. The only way to do this is to search all the
833 symbols. Since we only need the information for non functions in
834 dynamic objects, that's the only time we actually put anything on
835 the list WEAKS. We need this information so that if a regular
836 object refers to a symbol defined weakly in a dynamic object, the
837 real symbol in the dynamic object is also put in the dynamic
838 symbols; we also must arrange for both symbols to point to the
839 same memory location. We could handle the general case of symbol
840 aliasing, but a general symbol alias can only be generated in
841 assembler code, handling it correctly would be very time
842 consuming, and other ELF linkers don't handle general aliasing
844 while (weaks
!= NULL
)
846 struct elf_link_hash_entry
*hlook
;
849 struct elf_link_hash_entry
**hpp
;
850 struct elf_link_hash_entry
**hppend
;
853 weaks
= hlook
->weakdef
;
854 hlook
->weakdef
= NULL
;
856 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
857 || hlook
->root
.type
== bfd_link_hash_defweak
858 || hlook
->root
.type
== bfd_link_hash_common
859 || hlook
->root
.type
== bfd_link_hash_indirect
);
860 slook
= hlook
->root
.u
.def
.section
;
861 vlook
= hlook
->root
.u
.def
.value
;
863 hpp
= elf_sym_hashes (abfd
);
864 hppend
= hpp
+ extsymcount
;
865 for (; hpp
< hppend
; hpp
++)
867 struct elf_link_hash_entry
*h
;
870 if (h
!= NULL
&& h
!= hlook
871 && h
->root
.type
== bfd_link_hash_defined
872 && h
->root
.u
.def
.section
== slook
873 && h
->root
.u
.def
.value
== vlook
)
877 /* If the weak definition is in the list of dynamic
878 symbols, make sure the real definition is put there
880 if (hlook
->dynindx
!= -1
883 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
898 /* If this object is the same format as the output object, and it is
899 not a shared library, then let the backend look through the
902 This is required to build global offset table entries and to
903 arrange for dynamic relocs. It is not required for the
904 particular common case of linking non PIC code, even when linking
905 against shared libraries, but unfortunately there is no way of
906 knowing whether an object file has been compiled PIC or not.
907 Looking through the relocs is not particularly time consuming.
908 The problem is that we must either (1) keep the relocs in memory,
909 which causes the linker to require additional runtime memory or
910 (2) read the relocs twice from the input file, which wastes time.
911 This would be a good case for using mmap.
913 I have no idea how to handle linking PIC code into a file of a
914 different format. It probably can't be done. */
915 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
917 && abfd
->xvec
== info
->hash
->creator
918 && check_relocs
!= NULL
)
922 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
924 Elf_Internal_Rela
*internal_relocs
;
927 if ((o
->flags
& SEC_RELOC
) == 0
928 || o
->reloc_count
== 0)
931 /* I believe we can ignore the relocs for any section which
932 does not form part of the final process image, such as a
933 debugging section. */
934 if ((o
->flags
& SEC_ALLOC
) == 0)
937 internal_relocs
= elf_link_read_relocs (abfd
, o
, (PTR
) NULL
,
938 (Elf_Internal_Rela
*) NULL
,
940 if (internal_relocs
== NULL
)
943 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
945 if (! info
->keep_memory
)
946 free (internal_relocs
);
963 /* Create some sections which will be filled in with dynamic linking
964 information. ABFD is an input file which requires dynamic sections
965 to be created. The dynamic sections take up virtual memory space
966 when the final executable is run, so we need to create them before
967 addresses are assigned to the output sections. We work out the
968 actual contents and size of these sections later. */
971 elf_link_create_dynamic_sections (abfd
, info
)
973 struct bfd_link_info
*info
;
976 register asection
*s
;
977 struct elf_link_hash_entry
*h
;
978 struct elf_backend_data
*bed
;
980 if (elf_hash_table (info
)->dynamic_sections_created
)
983 /* Make sure that all dynamic sections use the same input BFD. */
984 if (elf_hash_table (info
)->dynobj
== NULL
)
985 elf_hash_table (info
)->dynobj
= abfd
;
987 abfd
= elf_hash_table (info
)->dynobj
;
989 /* Note that we set the SEC_IN_MEMORY flag for all of these
991 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
;
993 /* A dynamically linked executable has a .interp section, but a
994 shared library does not. */
997 s
= bfd_make_section (abfd
, ".interp");
999 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1003 s
= bfd_make_section (abfd
, ".dynsym");
1005 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1006 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1009 s
= bfd_make_section (abfd
, ".dynstr");
1011 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1014 /* Create a strtab to hold the dynamic symbol names. */
1015 if (elf_hash_table (info
)->dynstr
== NULL
)
1017 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1018 if (elf_hash_table (info
)->dynstr
== NULL
)
1022 s
= bfd_make_section (abfd
, ".dynamic");
1024 || ! bfd_set_section_flags (abfd
, s
, flags
)
1025 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1028 /* The special symbol _DYNAMIC is always set to the start of the
1029 .dynamic section. This call occurs before we have processed the
1030 symbols for any dynamic object, so we don't have to worry about
1031 overriding a dynamic definition. We could set _DYNAMIC in a
1032 linker script, but we only want to define it if we are, in fact,
1033 creating a .dynamic section. We don't want to define it if there
1034 is no .dynamic section, since on some ELF platforms the start up
1035 code examines it to decide how to initialize the process. */
1037 if (! (_bfd_generic_link_add_one_symbol
1038 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1039 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1040 (struct bfd_link_hash_entry
**) &h
)))
1042 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1043 h
->type
= STT_OBJECT
;
1046 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1049 s
= bfd_make_section (abfd
, ".hash");
1051 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1052 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1055 /* Let the backend create the rest of the sections. This lets the
1056 backend set the right flags. The backend will normally create
1057 the .got and .plt sections. */
1058 bed
= get_elf_backend_data (abfd
);
1059 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1062 elf_hash_table (info
)->dynamic_sections_created
= true;
1067 /* Add an entry to the .dynamic table. */
1070 elf_add_dynamic_entry (info
, tag
, val
)
1071 struct bfd_link_info
*info
;
1075 Elf_Internal_Dyn dyn
;
1079 bfd_byte
*newcontents
;
1081 dynobj
= elf_hash_table (info
)->dynobj
;
1083 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1084 BFD_ASSERT (s
!= NULL
);
1086 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1087 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1088 if (newcontents
== NULL
)
1092 dyn
.d_un
.d_val
= val
;
1093 elf_swap_dyn_out (dynobj
, &dyn
,
1094 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1096 s
->_raw_size
= newsize
;
1097 s
->contents
= newcontents
;
1103 /* Read and swap the relocs for a section. They may have been cached.
1104 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1105 they are used as buffers to read into. They are known to be large
1106 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1107 value is allocated using either malloc or bfd_alloc, according to
1108 the KEEP_MEMORY argument. */
1110 static Elf_Internal_Rela
*
1111 elf_link_read_relocs (abfd
, o
, external_relocs
, internal_relocs
, keep_memory
)
1114 PTR external_relocs
;
1115 Elf_Internal_Rela
*internal_relocs
;
1116 boolean keep_memory
;
1118 Elf_Internal_Shdr
*rel_hdr
;
1120 Elf_Internal_Rela
*alloc2
= NULL
;
1122 if (elf_section_data (o
)->relocs
!= NULL
)
1123 return elf_section_data (o
)->relocs
;
1125 if (o
->reloc_count
== 0)
1128 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1130 if (internal_relocs
== NULL
)
1134 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1136 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1138 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1139 if (internal_relocs
== NULL
)
1143 if (external_relocs
== NULL
)
1145 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1148 external_relocs
= alloc1
;
1151 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1152 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1153 != rel_hdr
->sh_size
))
1156 /* Swap in the relocs. For convenience, we always produce an
1157 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1159 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1161 Elf_External_Rel
*erel
;
1162 Elf_External_Rel
*erelend
;
1163 Elf_Internal_Rela
*irela
;
1165 erel
= (Elf_External_Rel
*) external_relocs
;
1166 erelend
= erel
+ o
->reloc_count
;
1167 irela
= internal_relocs
;
1168 for (; erel
< erelend
; erel
++, irela
++)
1170 Elf_Internal_Rel irel
;
1172 elf_swap_reloc_in (abfd
, erel
, &irel
);
1173 irela
->r_offset
= irel
.r_offset
;
1174 irela
->r_info
= irel
.r_info
;
1175 irela
->r_addend
= 0;
1180 Elf_External_Rela
*erela
;
1181 Elf_External_Rela
*erelaend
;
1182 Elf_Internal_Rela
*irela
;
1184 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1186 erela
= (Elf_External_Rela
*) external_relocs
;
1187 erelaend
= erela
+ o
->reloc_count
;
1188 irela
= internal_relocs
;
1189 for (; erela
< erelaend
; erela
++, irela
++)
1190 elf_swap_reloca_in (abfd
, erela
, irela
);
1193 /* Cache the results for next time, if we can. */
1195 elf_section_data (o
)->relocs
= internal_relocs
;
1200 /* Don't free alloc2, since if it was allocated we are passing it
1201 back (under the name of internal_relocs). */
1203 return internal_relocs
;
1214 /* Record an assignment to a symbol made by a linker script. We need
1215 this in case some dynamic object refers to this symbol. */
1219 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1221 struct bfd_link_info
*info
;
1225 struct elf_link_hash_entry
*h
;
1227 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1230 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1234 /* If this symbol is being provided by the linker script, and it is
1235 currently defined by a dynamic object, but not by a regular
1236 object, then mark it as undefined so that the generic linker will
1237 force the correct value. */
1239 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1240 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1241 h
->root
.type
= bfd_link_hash_undefined
;
1243 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1244 h
->type
= STT_OBJECT
;
1246 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1247 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1249 && h
->dynindx
== -1)
1251 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1254 /* If this is a weak defined symbol, and we know a corresponding
1255 real symbol from the same dynamic object, make sure the real
1256 symbol is also made into a dynamic symbol. */
1257 if (h
->weakdef
!= NULL
1258 && h
->weakdef
->dynindx
== -1)
1260 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1269 /* Array used to determine the number of hash table buckets to use
1270 based on the number of symbols there are. If there are fewer than
1271 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1272 fewer than 37 we use 17 buckets, and so forth. We never use more
1273 than 521 buckets. */
1275 static const size_t elf_buckets
[] =
1277 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 0
1280 /* Set up the sizes and contents of the ELF dynamic sections. This is
1281 called by the ELF linker emulation before_allocation routine. We
1282 must set the sizes of the sections before the linker sets the
1283 addresses of the various sections. */
1286 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
1287 export_dynamic
, info
, sinterpptr
)
1291 boolean export_dynamic
;
1292 struct bfd_link_info
*info
;
1293 asection
**sinterpptr
;
1296 struct elf_backend_data
*bed
;
1300 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1303 dynobj
= elf_hash_table (info
)->dynobj
;
1305 /* If there were no dynamic objects in the link, there is nothing to
1310 /* If we are supposed to export all symbols into the dynamic symbol
1311 table (this is not the normal case), then do so. */
1314 struct elf_info_failed eif
;
1318 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
1324 if (elf_hash_table (info
)->dynamic_sections_created
)
1326 struct elf_info_failed eif
;
1327 struct elf_link_hash_entry
*h
;
1328 bfd_size_type strsize
;
1330 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
1331 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
1337 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, soname
,
1339 if (indx
== (bfd_size_type
) -1
1340 || ! elf_add_dynamic_entry (info
, DT_SONAME
, indx
))
1346 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
1354 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
1356 if (indx
== (bfd_size_type
) -1
1357 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
1361 /* Find all symbols which were defined in a dynamic object and make
1362 the backend pick a reasonable value for them. */
1365 elf_link_hash_traverse (elf_hash_table (info
),
1366 elf_adjust_dynamic_symbol
,
1371 /* Add some entries to the .dynamic section. We fill in some of the
1372 values later, in elf_bfd_final_link, but we must add the entries
1373 now so that we know the final size of the .dynamic section. */
1374 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
1377 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1378 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1380 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
1383 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
1386 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1387 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1389 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
1392 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1393 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
1394 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
1395 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
1396 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
1397 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
1398 sizeof (Elf_External_Sym
)))
1402 /* The backend must work out the sizes of all the other dynamic
1404 bed
= get_elf_backend_data (output_bfd
);
1405 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
1408 if (elf_hash_table (info
)->dynamic_sections_created
)
1413 size_t bucketcount
= 0;
1414 Elf_Internal_Sym isym
;
1416 /* Set the size of the .dynsym and .hash sections. We counted
1417 the number of dynamic symbols in elf_link_add_object_symbols.
1418 We will build the contents of .dynsym and .hash when we build
1419 the final symbol table, because until then we do not know the
1420 correct value to give the symbols. We built the .dynstr
1421 section as we went along in elf_link_add_object_symbols. */
1422 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
1423 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
1424 BFD_ASSERT (s
!= NULL
);
1425 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
1426 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1427 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
1430 /* The first entry in .dynsym is a dummy symbol. */
1437 elf_swap_symbol_out (output_bfd
, &isym
,
1438 (PTR
) (Elf_External_Sym
*) s
->contents
);
1440 for (i
= 0; elf_buckets
[i
] != 0; i
++)
1442 bucketcount
= elf_buckets
[i
];
1443 if (dynsymcount
< elf_buckets
[i
+ 1])
1447 s
= bfd_get_section_by_name (dynobj
, ".hash");
1448 BFD_ASSERT (s
!= NULL
);
1449 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
1450 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1451 if (s
->contents
== NULL
)
1453 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
1455 put_word (output_bfd
, bucketcount
, s
->contents
);
1456 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
1458 elf_hash_table (info
)->bucketcount
= bucketcount
;
1460 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
1461 BFD_ASSERT (s
!= NULL
);
1462 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1464 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
1472 /* This routine is used to export all defined symbols into the dynamic
1473 symbol table. It is called via elf_link_hash_traverse. */
1476 elf_export_symbol (h
, data
)
1477 struct elf_link_hash_entry
*h
;
1480 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1482 if (h
->dynindx
== -1
1483 && (h
->elf_link_hash_flags
1484 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
1486 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1497 /* Make the backend pick a good value for a dynamic symbol. This is
1498 called via elf_link_hash_traverse, and also calls itself
1502 elf_adjust_dynamic_symbol (h
, data
)
1503 struct elf_link_hash_entry
*h
;
1506 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1508 struct elf_backend_data
*bed
;
1510 /* If -Bsymbolic was used (which means to bind references to global
1511 symbols to the definition within the shared object), and this
1512 symbol was defined in a regular object, then it actually doesn't
1513 need a PLT entry. */
1514 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
1515 && eif
->info
->shared
1516 && eif
->info
->symbolic
1517 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1518 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
1520 /* If this symbol does not require a PLT entry, and it is not
1521 defined by a dynamic object, or is not referenced by a regular
1522 object, ignore it. We do have to handle a weak defined symbol,
1523 even if no regular object refers to it, if we decided to add it
1524 to the dynamic symbol table. FIXME: Do we normally need to worry
1525 about symbols which are defined by one dynamic object and
1526 referenced by another one? */
1527 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
1528 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
1529 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1530 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
1531 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
1534 /* If we've already adjusted this symbol, don't do it again. This
1535 can happen via a recursive call. */
1536 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
1539 /* Don't look at this symbol again. Note that we must set this
1540 after checking the above conditions, because we may look at a
1541 symbol once, decide not to do anything, and then get called
1542 recursively later after REF_REGULAR is set below. */
1543 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
1545 /* If this is a weak definition, and we know a real definition, and
1546 the real symbol is not itself defined by a regular object file,
1547 then get a good value for the real definition. We handle the
1548 real symbol first, for the convenience of the backend routine.
1550 Note that there is a confusing case here. If the real definition
1551 is defined by a regular object file, we don't get the real symbol
1552 from the dynamic object, but we do get the weak symbol. If the
1553 processor backend uses a COPY reloc, then if some routine in the
1554 dynamic object changes the real symbol, we will not see that
1555 change in the corresponding weak symbol. This is the way other
1556 ELF linkers work as well, and seems to be a result of the shared
1559 I will clarify this issue. Most SVR4 shared libraries define the
1560 variable _timezone and define timezone as a weak synonym. The
1561 tzset call changes _timezone. If you write
1562 extern int timezone;
1564 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
1565 you might expect that, since timezone is a synonym for _timezone,
1566 the same number will print both times. However, if the processor
1567 backend uses a COPY reloc, then actually timezone will be copied
1568 into your process image, and, since you define _timezone
1569 yourself, _timezone will not. Thus timezone and _timezone will
1570 wind up at different memory locations. The tzset call will set
1571 _timezone, leaving timezone unchanged. */
1573 if (h
->weakdef
!= NULL
)
1575 struct elf_link_hash_entry
*weakdef
;
1577 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
1578 || h
->root
.type
== bfd_link_hash_defweak
);
1579 weakdef
= h
->weakdef
;
1580 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
1581 || weakdef
->root
.type
== bfd_link_hash_defweak
);
1582 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
1583 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1585 /* This symbol is defined by a regular object file, so we
1586 will not do anything special. Clear weakdef for the
1587 convenience of the processor backend. */
1592 /* There is an implicit reference by a regular object file
1593 via the weak symbol. */
1594 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1595 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
1600 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
1601 bed
= get_elf_backend_data (dynobj
);
1602 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
1611 /* Final phase of ELF linker. */
1613 /* A structure we use to avoid passing large numbers of arguments. */
1615 struct elf_final_link_info
1617 /* General link information. */
1618 struct bfd_link_info
*info
;
1621 /* Symbol string table. */
1622 struct bfd_strtab_hash
*symstrtab
;
1623 /* .dynsym section. */
1624 asection
*dynsym_sec
;
1625 /* .hash section. */
1627 /* Buffer large enough to hold contents of any section. */
1629 /* Buffer large enough to hold external relocs of any section. */
1630 PTR external_relocs
;
1631 /* Buffer large enough to hold internal relocs of any section. */
1632 Elf_Internal_Rela
*internal_relocs
;
1633 /* Buffer large enough to hold external local symbols of any input
1635 Elf_External_Sym
*external_syms
;
1636 /* Buffer large enough to hold internal local symbols of any input
1638 Elf_Internal_Sym
*internal_syms
;
1639 /* Array large enough to hold a symbol index for each local symbol
1640 of any input BFD. */
1642 /* Array large enough to hold a section pointer for each local
1643 symbol of any input BFD. */
1644 asection
**sections
;
1645 /* Buffer to hold swapped out symbols. */
1646 Elf_External_Sym
*symbuf
;
1647 /* Number of swapped out symbols in buffer. */
1648 size_t symbuf_count
;
1649 /* Number of symbols which fit in symbuf. */
1653 static boolean elf_link_output_sym
1654 PARAMS ((struct elf_final_link_info
*, const char *,
1655 Elf_Internal_Sym
*, asection
*));
1656 static boolean elf_link_flush_output_syms
1657 PARAMS ((struct elf_final_link_info
*));
1658 static boolean elf_link_output_extsym
1659 PARAMS ((struct elf_link_hash_entry
*, PTR
));
1660 static boolean elf_link_input_bfd
1661 PARAMS ((struct elf_final_link_info
*, bfd
*));
1662 static boolean elf_reloc_link_order
1663 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
1664 struct bfd_link_order
*));
1666 /* This struct is used to pass information to routines called via
1667 elf_link_hash_traverse which must return failure. */
1669 struct elf_finfo_failed
1672 struct elf_final_link_info
*finfo
;
1675 /* Do the final step of an ELF link. */
1678 elf_bfd_final_link (abfd
, info
)
1680 struct bfd_link_info
*info
;
1684 struct elf_final_link_info finfo
;
1685 register asection
*o
;
1686 register struct bfd_link_order
*p
;
1688 size_t max_contents_size
;
1689 size_t max_external_reloc_size
;
1690 size_t max_internal_reloc_count
;
1691 size_t max_sym_count
;
1693 Elf_Internal_Sym elfsym
;
1695 Elf_Internal_Shdr
*symtab_hdr
;
1696 Elf_Internal_Shdr
*symstrtab_hdr
;
1697 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1698 struct elf_finfo_failed eif
;
1701 abfd
->flags
|= DYNAMIC
;
1703 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
1704 dynobj
= elf_hash_table (info
)->dynobj
;
1707 finfo
.output_bfd
= abfd
;
1708 finfo
.symstrtab
= elf_stringtab_init ();
1709 if (finfo
.symstrtab
== NULL
)
1713 finfo
.dynsym_sec
= NULL
;
1714 finfo
.hash_sec
= NULL
;
1718 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
1719 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
1720 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
1722 finfo
.contents
= NULL
;
1723 finfo
.external_relocs
= NULL
;
1724 finfo
.internal_relocs
= NULL
;
1725 finfo
.external_syms
= NULL
;
1726 finfo
.internal_syms
= NULL
;
1727 finfo
.indices
= NULL
;
1728 finfo
.sections
= NULL
;
1729 finfo
.symbuf
= NULL
;
1730 finfo
.symbuf_count
= 0;
1732 /* Count up the number of relocations we will output for each output
1733 section, so that we know the sizes of the reloc sections. We
1734 also figure out some maximum sizes. */
1735 max_contents_size
= 0;
1736 max_external_reloc_size
= 0;
1737 max_internal_reloc_count
= 0;
1739 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
1743 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
1745 if (p
->type
== bfd_section_reloc_link_order
1746 || p
->type
== bfd_symbol_reloc_link_order
)
1748 else if (p
->type
== bfd_indirect_link_order
)
1752 sec
= p
->u
.indirect
.section
;
1754 if (info
->relocateable
)
1755 o
->reloc_count
+= sec
->reloc_count
;
1757 if (sec
->_raw_size
> max_contents_size
)
1758 max_contents_size
= sec
->_raw_size
;
1759 if (sec
->_cooked_size
> max_contents_size
)
1760 max_contents_size
= sec
->_cooked_size
;
1762 /* We are interested in just local symbols, not all
1764 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
)
1768 if (elf_bad_symtab (sec
->owner
))
1769 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
1770 / sizeof (Elf_External_Sym
));
1772 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
1774 if (sym_count
> max_sym_count
)
1775 max_sym_count
= sym_count
;
1777 if ((sec
->flags
& SEC_RELOC
) != 0)
1781 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
1782 if (ext_size
> max_external_reloc_size
)
1783 max_external_reloc_size
= ext_size
;
1784 if (sec
->reloc_count
> max_internal_reloc_count
)
1785 max_internal_reloc_count
= sec
->reloc_count
;
1791 if (o
->reloc_count
> 0)
1792 o
->flags
|= SEC_RELOC
;
1795 /* Explicitly clear the SEC_RELOC flag. The linker tends to
1796 set it (this is probably a bug) and if it is set
1797 assign_section_numbers will create a reloc section. */
1798 o
->flags
&=~ SEC_RELOC
;
1801 /* If the SEC_ALLOC flag is not set, force the section VMA to
1802 zero. This is done in elf_fake_sections as well, but forcing
1803 the VMA to 0 here will ensure that relocs against these
1804 sections are handled correctly. */
1805 if ((o
->flags
& SEC_ALLOC
) == 0)
1809 /* Figure out the file positions for everything but the symbol table
1810 and the relocs. We set symcount to force assign_section_numbers
1811 to create a symbol table. */
1812 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
1813 BFD_ASSERT (! abfd
->output_has_begun
);
1814 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
1817 /* That created the reloc sections. Set their sizes, and assign
1818 them file positions, and allocate some buffers. */
1819 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1821 if ((o
->flags
& SEC_RELOC
) != 0)
1823 Elf_Internal_Shdr
*rel_hdr
;
1824 register struct elf_link_hash_entry
**p
, **pend
;
1826 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1828 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
1830 /* The contents field must last into write_object_contents,
1831 so we allocate it with bfd_alloc rather than malloc. */
1832 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
1833 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
1836 p
= ((struct elf_link_hash_entry
**)
1837 bfd_malloc (o
->reloc_count
1838 * sizeof (struct elf_link_hash_entry
*)));
1839 if (p
== NULL
&& o
->reloc_count
!= 0)
1841 elf_section_data (o
)->rel_hashes
= p
;
1842 pend
= p
+ o
->reloc_count
;
1843 for (; p
< pend
; p
++)
1846 /* Use the reloc_count field as an index when outputting the
1852 _bfd_elf_assign_file_positions_for_relocs (abfd
);
1854 /* We have now assigned file positions for all the sections except
1855 .symtab and .strtab. We start the .symtab section at the current
1856 file position, and write directly to it. We build the .strtab
1857 section in memory. */
1859 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1860 /* sh_name is set in prep_headers. */
1861 symtab_hdr
->sh_type
= SHT_SYMTAB
;
1862 symtab_hdr
->sh_flags
= 0;
1863 symtab_hdr
->sh_addr
= 0;
1864 symtab_hdr
->sh_size
= 0;
1865 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
1866 /* sh_link is set in assign_section_numbers. */
1867 /* sh_info is set below. */
1868 /* sh_offset is set just below. */
1869 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
1871 off
= elf_tdata (abfd
)->next_file_pos
;
1872 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
1874 /* Note that at this point elf_tdata (abfd)->next_file_pos is
1875 incorrect. We do not yet know the size of the .symtab section.
1876 We correct next_file_pos below, after we do know the size. */
1878 /* Allocate a buffer to hold swapped out symbols. This is to avoid
1879 continuously seeking to the right position in the file. */
1880 if (! info
->keep_memory
|| max_sym_count
< 20)
1881 finfo
.symbuf_size
= 20;
1883 finfo
.symbuf_size
= max_sym_count
;
1884 finfo
.symbuf
= ((Elf_External_Sym
*)
1885 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
1886 if (finfo
.symbuf
== NULL
)
1889 /* Start writing out the symbol table. The first symbol is always a
1891 if (info
->strip
!= strip_all
|| info
->relocateable
)
1893 elfsym
.st_value
= 0;
1896 elfsym
.st_other
= 0;
1897 elfsym
.st_shndx
= SHN_UNDEF
;
1898 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
1899 &elfsym
, bfd_und_section_ptr
))
1904 /* Some standard ELF linkers do this, but we don't because it causes
1905 bootstrap comparison failures. */
1906 /* Output a file symbol for the output file as the second symbol.
1907 We output this even if we are discarding local symbols, although
1908 I'm not sure if this is correct. */
1909 elfsym
.st_value
= 0;
1911 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
1912 elfsym
.st_other
= 0;
1913 elfsym
.st_shndx
= SHN_ABS
;
1914 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
1915 &elfsym
, bfd_abs_section_ptr
))
1919 /* Output a symbol for each section. We output these even if we are
1920 discarding local symbols, since they are used for relocs. These
1921 symbols have no names. We store the index of each one in the
1922 index field of the section, so that we can find it again when
1923 outputting relocs. */
1924 if (info
->strip
!= strip_all
|| info
->relocateable
)
1926 elfsym
.st_value
= 0;
1928 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
1929 elfsym
.st_other
= 0;
1930 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
1932 o
= section_from_elf_index (abfd
, i
);
1934 o
->target_index
= abfd
->symcount
;
1935 elfsym
.st_shndx
= i
;
1936 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
1942 /* Allocate some memory to hold information read in from the input
1944 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
1945 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
1946 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
1947 bfd_malloc (max_internal_reloc_count
1948 * sizeof (Elf_Internal_Rela
)));
1949 finfo
.external_syms
= ((Elf_External_Sym
*)
1950 bfd_malloc (max_sym_count
1951 * sizeof (Elf_External_Sym
)));
1952 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
1953 bfd_malloc (max_sym_count
1954 * sizeof (Elf_Internal_Sym
)));
1955 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
1956 finfo
.sections
= ((asection
**)
1957 bfd_malloc (max_sym_count
* sizeof (asection
*)));
1958 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
1959 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
1960 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
1961 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
1962 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
1963 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
1964 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
1967 /* Since ELF permits relocations to be against local symbols, we
1968 must have the local symbols available when we do the relocations.
1969 Since we would rather only read the local symbols once, and we
1970 would rather not keep them in memory, we handle all the
1971 relocations for a single input file at the same time.
1973 Unfortunately, there is no way to know the total number of local
1974 symbols until we have seen all of them, and the local symbol
1975 indices precede the global symbol indices. This means that when
1976 we are generating relocateable output, and we see a reloc against
1977 a global symbol, we can not know the symbol index until we have
1978 finished examining all the local symbols to see which ones we are
1979 going to output. To deal with this, we keep the relocations in
1980 memory, and don't output them until the end of the link. This is
1981 an unfortunate waste of memory, but I don't see a good way around
1982 it. Fortunately, it only happens when performing a relocateable
1983 link, which is not the common case. FIXME: If keep_memory is set
1984 we could write the relocs out and then read them again; I don't
1985 know how bad the memory loss will be. */
1987 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
1988 sub
->output_has_begun
= false;
1989 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1991 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
1993 if (p
->type
== bfd_indirect_link_order
1994 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
1995 == bfd_target_elf_flavour
))
1997 sub
= p
->u
.indirect
.section
->owner
;
1998 if (! sub
->output_has_begun
)
2000 if (! elf_link_input_bfd (&finfo
, sub
))
2002 sub
->output_has_begun
= true;
2005 else if (p
->type
== bfd_section_reloc_link_order
2006 || p
->type
== bfd_symbol_reloc_link_order
)
2008 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
2013 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
2019 /* That wrote out all the local symbols. Finish up the symbol table
2020 with the global symbols. */
2022 /* The sh_info field records the index of the first non local
2024 symtab_hdr
->sh_info
= abfd
->symcount
;
2026 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
2028 /* We get the global symbols from the hash table. */
2031 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
2036 /* Flush all symbols to the file. */
2037 if (! elf_link_flush_output_syms (&finfo
))
2040 /* Now we know the size of the symtab section. */
2041 off
+= symtab_hdr
->sh_size
;
2043 /* Finish up and write out the symbol string table (.strtab)
2045 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
2046 /* sh_name was set in prep_headers. */
2047 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
2048 symstrtab_hdr
->sh_flags
= 0;
2049 symstrtab_hdr
->sh_addr
= 0;
2050 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
2051 symstrtab_hdr
->sh_entsize
= 0;
2052 symstrtab_hdr
->sh_link
= 0;
2053 symstrtab_hdr
->sh_info
= 0;
2054 /* sh_offset is set just below. */
2055 symstrtab_hdr
->sh_addralign
= 1;
2057 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
2058 elf_tdata (abfd
)->next_file_pos
= off
;
2060 if (abfd
->symcount
> 0)
2062 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
2063 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
2067 /* Adjust the relocs to have the correct symbol indices. */
2068 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2070 struct elf_link_hash_entry
**rel_hash
;
2071 Elf_Internal_Shdr
*rel_hdr
;
2073 if ((o
->flags
& SEC_RELOC
) == 0)
2076 rel_hash
= elf_section_data (o
)->rel_hashes
;
2077 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2078 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
2080 if (*rel_hash
== NULL
)
2083 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
2085 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2087 Elf_External_Rel
*erel
;
2088 Elf_Internal_Rel irel
;
2090 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
2091 elf_swap_reloc_in (abfd
, erel
, &irel
);
2092 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2093 ELF_R_TYPE (irel
.r_info
));
2094 elf_swap_reloc_out (abfd
, &irel
, erel
);
2098 Elf_External_Rela
*erela
;
2099 Elf_Internal_Rela irela
;
2101 BFD_ASSERT (rel_hdr
->sh_entsize
2102 == sizeof (Elf_External_Rela
));
2104 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
2105 elf_swap_reloca_in (abfd
, erela
, &irela
);
2106 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2107 ELF_R_TYPE (irela
.r_info
));
2108 elf_swap_reloca_out (abfd
, &irela
, erela
);
2112 /* Set the reloc_count field to 0 to prevent write_relocs from
2113 trying to swap the relocs out itself. */
2117 /* If we are linking against a dynamic object, or generating a
2118 shared library, finish up the dynamic linking information. */
2121 Elf_External_Dyn
*dyncon
, *dynconend
;
2123 /* Fix up .dynamic entries. */
2124 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
2125 BFD_ASSERT (o
!= NULL
);
2127 dyncon
= (Elf_External_Dyn
*) o
->contents
;
2128 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
2129 for (; dyncon
< dynconend
; dyncon
++)
2131 Elf_Internal_Dyn dyn
;
2135 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2142 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
2143 magic _init and _fini symbols. This is pretty ugly,
2144 but we are compatible. */
2152 struct elf_link_hash_entry
*h
;
2154 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
2155 false, false, true);
2157 && (h
->root
.type
== bfd_link_hash_defined
2158 || h
->root
.type
== bfd_link_hash_defweak
))
2160 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
2161 o
= h
->root
.u
.def
.section
;
2162 if (o
->output_section
!= NULL
)
2163 dyn
.d_un
.d_val
+= (o
->output_section
->vma
2164 + o
->output_offset
);
2167 /* The symbol is imported from another shared
2168 library and does not apply to this one. */
2172 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2186 o
= bfd_get_section_by_name (abfd
, name
);
2187 BFD_ASSERT (o
!= NULL
);
2188 dyn
.d_un
.d_ptr
= o
->vma
;
2189 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2196 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
2201 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
2203 Elf_Internal_Shdr
*hdr
;
2205 hdr
= elf_elfsections (abfd
)[i
];
2206 if (hdr
->sh_type
== type
2207 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
2209 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
2210 dyn
.d_un
.d_val
+= hdr
->sh_size
;
2213 if (dyn
.d_un
.d_val
== 0
2214 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
2215 dyn
.d_un
.d_val
= hdr
->sh_addr
;
2219 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2225 /* If we have created any dynamic sections, then output them. */
2228 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
2231 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
2233 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
2234 || o
->_raw_size
== 0)
2236 if ((o
->flags
& SEC_IN_MEMORY
) == 0)
2238 /* At this point, we are only interested in sections
2239 created by elf_link_create_dynamic_sections. FIXME:
2240 This test is fragile. */
2243 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
2245 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
2247 if (! bfd_set_section_contents (abfd
, o
->output_section
,
2248 o
->contents
, o
->output_offset
,
2256 /* The contents of the .dynstr section are actually in a
2258 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
2259 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
2260 || ! _bfd_stringtab_emit (abfd
,
2261 elf_hash_table (info
)->dynstr
))
2267 if (finfo
.symstrtab
!= NULL
)
2268 _bfd_stringtab_free (finfo
.symstrtab
);
2269 if (finfo
.contents
!= NULL
)
2270 free (finfo
.contents
);
2271 if (finfo
.external_relocs
!= NULL
)
2272 free (finfo
.external_relocs
);
2273 if (finfo
.internal_relocs
!= NULL
)
2274 free (finfo
.internal_relocs
);
2275 if (finfo
.external_syms
!= NULL
)
2276 free (finfo
.external_syms
);
2277 if (finfo
.internal_syms
!= NULL
)
2278 free (finfo
.internal_syms
);
2279 if (finfo
.indices
!= NULL
)
2280 free (finfo
.indices
);
2281 if (finfo
.sections
!= NULL
)
2282 free (finfo
.sections
);
2283 if (finfo
.symbuf
!= NULL
)
2284 free (finfo
.symbuf
);
2285 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2287 if ((o
->flags
& SEC_RELOC
) != 0
2288 && elf_section_data (o
)->rel_hashes
!= NULL
)
2289 free (elf_section_data (o
)->rel_hashes
);
2292 elf_tdata (abfd
)->linker
= true;
2297 if (finfo
.symstrtab
!= NULL
)
2298 _bfd_stringtab_free (finfo
.symstrtab
);
2299 if (finfo
.contents
!= NULL
)
2300 free (finfo
.contents
);
2301 if (finfo
.external_relocs
!= NULL
)
2302 free (finfo
.external_relocs
);
2303 if (finfo
.internal_relocs
!= NULL
)
2304 free (finfo
.internal_relocs
);
2305 if (finfo
.external_syms
!= NULL
)
2306 free (finfo
.external_syms
);
2307 if (finfo
.internal_syms
!= NULL
)
2308 free (finfo
.internal_syms
);
2309 if (finfo
.indices
!= NULL
)
2310 free (finfo
.indices
);
2311 if (finfo
.sections
!= NULL
)
2312 free (finfo
.sections
);
2313 if (finfo
.symbuf
!= NULL
)
2314 free (finfo
.symbuf
);
2315 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2317 if ((o
->flags
& SEC_RELOC
) != 0
2318 && elf_section_data (o
)->rel_hashes
!= NULL
)
2319 free (elf_section_data (o
)->rel_hashes
);
2325 /* Add a symbol to the output symbol table. */
2328 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
2329 struct elf_final_link_info
*finfo
;
2331 Elf_Internal_Sym
*elfsym
;
2332 asection
*input_sec
;
2334 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
2335 struct bfd_link_info
*info
,
2340 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
2341 elf_backend_link_output_symbol_hook
;
2342 if (output_symbol_hook
!= NULL
)
2344 if (! ((*output_symbol_hook
)
2345 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
2349 if (name
== (const char *) NULL
|| *name
== '\0')
2350 elfsym
->st_name
= 0;
2353 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
2356 if (elfsym
->st_name
== (unsigned long) -1)
2360 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
2362 if (! elf_link_flush_output_syms (finfo
))
2366 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
2367 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
2368 ++finfo
->symbuf_count
;
2370 ++finfo
->output_bfd
->symcount
;
2375 /* Flush the output symbols to the file. */
2378 elf_link_flush_output_syms (finfo
)
2379 struct elf_final_link_info
*finfo
;
2381 if (finfo
->symbuf_count
> 0)
2383 Elf_Internal_Shdr
*symtab
;
2385 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
2387 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
2389 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
2390 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
2391 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
2394 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
2396 finfo
->symbuf_count
= 0;
2402 /* Add an external symbol to the symbol table. This is called from
2403 the hash table traversal routine. */
2406 elf_link_output_extsym (h
, data
)
2407 struct elf_link_hash_entry
*h
;
2410 struct elf_finfo_failed
*eif
= (struct elf_finfo_failed
*) data
;
2411 struct elf_final_link_info
*finfo
= eif
->finfo
;
2413 Elf_Internal_Sym sym
;
2414 asection
*input_sec
;
2416 /* If we are not creating a shared library, and this symbol is
2417 referenced by a shared library but is not defined anywhere, then
2418 warn that it is undefined. If we do not do this, the runtime
2419 linker will complain that the symbol is undefined when the
2420 program is run. We don't have to worry about symbols that are
2421 referenced by regular files, because we will already have issued
2422 warnings for them. */
2423 if (! finfo
->info
->relocateable
2424 && ! finfo
->info
->shared
2425 && h
->root
.type
== bfd_link_hash_undefined
2426 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
2427 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2429 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
2430 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
2431 (asection
*) NULL
, 0)))
2438 /* We don't want to output symbols that have never been mentioned by
2439 a regular file, or that we have been told to strip. However, if
2440 h->indx is set to -2, the symbol is used by a reloc and we must
2444 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2445 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2446 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2447 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2449 else if (finfo
->info
->strip
== strip_all
2450 || (finfo
->info
->strip
== strip_some
2451 && bfd_hash_lookup (finfo
->info
->keep_hash
,
2452 h
->root
.root
.string
,
2453 false, false) == NULL
))
2458 /* If we're stripping it, and it's not a dynamic symbol, there's
2459 nothing else to do. */
2460 if (strip
&& h
->dynindx
== -1)
2464 sym
.st_size
= h
->size
;
2466 if (h
->root
.type
== bfd_link_hash_undefweak
2467 || h
->root
.type
== bfd_link_hash_defweak
)
2468 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
2470 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
2472 switch (h
->root
.type
)
2475 case bfd_link_hash_new
:
2479 case bfd_link_hash_undefined
:
2480 input_sec
= bfd_und_section_ptr
;
2481 sym
.st_shndx
= SHN_UNDEF
;
2484 case bfd_link_hash_undefweak
:
2485 input_sec
= bfd_und_section_ptr
;
2486 sym
.st_shndx
= SHN_UNDEF
;
2489 case bfd_link_hash_defined
:
2490 case bfd_link_hash_defweak
:
2492 input_sec
= h
->root
.u
.def
.section
;
2493 if (input_sec
->output_section
!= NULL
)
2496 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
2497 input_sec
->output_section
);
2498 if (sym
.st_shndx
== (unsigned short) -1)
2504 /* ELF symbols in relocateable files are section relative,
2505 but in nonrelocateable files they are virtual
2507 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
2508 if (! finfo
->info
->relocateable
)
2509 sym
.st_value
+= input_sec
->output_section
->vma
;
2513 BFD_ASSERT ((bfd_get_flavour (input_sec
->owner
)
2514 == bfd_target_elf_flavour
)
2515 && elf_elfheader (input_sec
->owner
)->e_type
== ET_DYN
);
2516 sym
.st_shndx
= SHN_UNDEF
;
2517 input_sec
= bfd_und_section_ptr
;
2522 case bfd_link_hash_common
:
2523 input_sec
= bfd_com_section_ptr
;
2524 sym
.st_shndx
= SHN_COMMON
;
2525 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
2528 case bfd_link_hash_indirect
:
2529 case bfd_link_hash_warning
:
2530 /* We can't represent these symbols in ELF. A warning symbol
2531 may have come from a .gnu.warning.SYMBOL section anyhow. We
2532 just put the target symbol in the hash table. If the target
2533 symbol does not really exist, don't do anything. */
2534 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
2536 return (elf_link_output_extsym
2537 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
2540 /* If this symbol should be put in the .dynsym section, then put it
2541 there now. We have already know the symbol index. We also fill
2542 in the entry in the .hash section. */
2543 if (h
->dynindx
!= -1
2544 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
2546 struct elf_backend_data
*bed
;
2549 bfd_byte
*bucketpos
;
2552 sym
.st_name
= h
->dynstr_index
;
2554 /* Give the processor backend a chance to tweak the symbol
2555 value, and also to finish up anything that needs to be done
2557 bed
= get_elf_backend_data (finfo
->output_bfd
);
2558 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
2559 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
2565 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
2566 (PTR
) (((Elf_External_Sym
*)
2567 finfo
->dynsym_sec
->contents
)
2570 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
2571 bucket
= (bfd_elf_hash ((const unsigned char *) h
->root
.root
.string
)
2573 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
2574 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
2575 chain
= get_word (finfo
->output_bfd
, bucketpos
);
2576 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
2577 put_word (finfo
->output_bfd
, chain
,
2578 ((bfd_byte
*) finfo
->hash_sec
->contents
2579 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
2582 /* If we're stripping it, then it was just a dynamic symbol, and
2583 there's nothing else to do. */
2587 h
->indx
= finfo
->output_bfd
->symcount
;
2589 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
2598 /* Link an input file into the linker output file. This function
2599 handles all the sections and relocations of the input file at once.
2600 This is so that we only have to read the local symbols once, and
2601 don't have to keep them in memory. */
2604 elf_link_input_bfd (finfo
, input_bfd
)
2605 struct elf_final_link_info
*finfo
;
2608 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
2609 bfd
*, asection
*, bfd_byte
*,
2610 Elf_Internal_Rela
*,
2611 Elf_Internal_Sym
*, asection
**));
2613 Elf_Internal_Shdr
*symtab_hdr
;
2616 Elf_External_Sym
*esym
;
2617 Elf_External_Sym
*esymend
;
2618 Elf_Internal_Sym
*isym
;
2620 asection
**ppsection
;
2623 output_bfd
= finfo
->output_bfd
;
2625 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
2627 /* If this is a dynamic object, we don't want to do anything here:
2628 we don't want the local symbols, and we don't want the section
2630 if (elf_elfheader (input_bfd
)->e_type
== ET_DYN
)
2633 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2634 if (elf_bad_symtab (input_bfd
))
2636 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
2641 locsymcount
= symtab_hdr
->sh_info
;
2642 extsymoff
= symtab_hdr
->sh_info
;
2645 /* Read the local symbols. */
2647 && (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
2648 || (bfd_read (finfo
->external_syms
, sizeof (Elf_External_Sym
),
2649 locsymcount
, input_bfd
)
2650 != locsymcount
* sizeof (Elf_External_Sym
))))
2653 /* Swap in the local symbols and write out the ones which we know
2654 are going into the output file. */
2655 esym
= finfo
->external_syms
;
2656 esymend
= esym
+ locsymcount
;
2657 isym
= finfo
->internal_syms
;
2658 pindex
= finfo
->indices
;
2659 ppsection
= finfo
->sections
;
2660 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
2664 Elf_Internal_Sym osym
;
2666 elf_swap_symbol_in (input_bfd
, esym
, isym
);
2669 if (elf_bad_symtab (input_bfd
))
2671 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
2678 if (isym
->st_shndx
== SHN_UNDEF
)
2679 isec
= bfd_und_section_ptr
;
2680 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
2681 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
2682 else if (isym
->st_shndx
== SHN_ABS
)
2683 isec
= bfd_abs_section_ptr
;
2684 else if (isym
->st_shndx
== SHN_COMMON
)
2685 isec
= bfd_com_section_ptr
;
2694 /* Don't output the first, undefined, symbol. */
2695 if (esym
== finfo
->external_syms
)
2698 /* If we are stripping all symbols, we don't want to output this
2700 if (finfo
->info
->strip
== strip_all
)
2703 /* We never output section symbols. Instead, we use the section
2704 symbol of the corresponding section in the output file. */
2705 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
2708 /* If we are discarding all local symbols, we don't want to
2709 output this one. If we are generating a relocateable output
2710 file, then some of the local symbols may be required by
2711 relocs; we output them below as we discover that they are
2713 if (finfo
->info
->discard
== discard_all
)
2716 /* Get the name of the symbol. */
2717 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
2722 /* See if we are discarding symbols with this name. */
2723 if ((finfo
->info
->strip
== strip_some
2724 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
2726 || (finfo
->info
->discard
== discard_l
2727 && strncmp (name
, finfo
->info
->lprefix
,
2728 finfo
->info
->lprefix_len
) == 0))
2731 /* If we get here, we are going to output this symbol. */
2735 /* Adjust the section index for the output file. */
2736 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
2737 isec
->output_section
);
2738 if (osym
.st_shndx
== (unsigned short) -1)
2741 *pindex
= output_bfd
->symcount
;
2743 /* ELF symbols in relocateable files are section relative, but
2744 in executable files they are virtual addresses. Note that
2745 this code assumes that all ELF sections have an associated
2746 BFD section with a reasonable value for output_offset; below
2747 we assume that they also have a reasonable value for
2748 output_section. Any special sections must be set up to meet
2749 these requirements. */
2750 osym
.st_value
+= isec
->output_offset
;
2751 if (! finfo
->info
->relocateable
)
2752 osym
.st_value
+= isec
->output_section
->vma
;
2754 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
2758 /* Relocate the contents of each section. */
2759 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
2761 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0)
2764 if ((o
->flags
& SEC_IN_MEMORY
) != 0
2765 && input_bfd
== elf_hash_table (finfo
->info
)->dynobj
)
2767 /* Section was created by elf_link_create_dynamic_sections.
2768 FIXME: This test is fragile. */
2772 /* Read the contents of the section. */
2773 if (! bfd_get_section_contents (input_bfd
, o
, finfo
->contents
,
2774 (file_ptr
) 0, o
->_raw_size
))
2777 if ((o
->flags
& SEC_RELOC
) != 0)
2779 Elf_Internal_Rela
*internal_relocs
;
2781 /* Get the swapped relocs. */
2782 internal_relocs
= elf_link_read_relocs (input_bfd
, o
,
2783 finfo
->external_relocs
,
2784 finfo
->internal_relocs
,
2786 if (internal_relocs
== NULL
2787 && o
->reloc_count
> 0)
2790 /* Relocate the section by invoking a back end routine.
2792 The back end routine is responsible for adjusting the
2793 section contents as necessary, and (if using Rela relocs
2794 and generating a relocateable output file) adjusting the
2795 reloc addend as necessary.
2797 The back end routine does not have to worry about setting
2798 the reloc address or the reloc symbol index.
2800 The back end routine is given a pointer to the swapped in
2801 internal symbols, and can access the hash table entries
2802 for the external symbols via elf_sym_hashes (input_bfd).
2804 When generating relocateable output, the back end routine
2805 must handle STB_LOCAL/STT_SECTION symbols specially. The
2806 output symbol is going to be a section symbol
2807 corresponding to the output section, which will require
2808 the addend to be adjusted. */
2810 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
2814 finfo
->internal_syms
,
2818 if (finfo
->info
->relocateable
)
2820 Elf_Internal_Rela
*irela
;
2821 Elf_Internal_Rela
*irelaend
;
2822 struct elf_link_hash_entry
**rel_hash
;
2823 Elf_Internal_Shdr
*input_rel_hdr
;
2824 Elf_Internal_Shdr
*output_rel_hdr
;
2826 /* Adjust the reloc addresses and symbol indices. */
2828 irela
= internal_relocs
;
2829 irelaend
= irela
+ o
->reloc_count
;
2830 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
2831 + o
->output_section
->reloc_count
);
2832 for (; irela
< irelaend
; irela
++, rel_hash
++)
2834 unsigned long r_symndx
;
2835 Elf_Internal_Sym
*isym
;
2838 irela
->r_offset
+= o
->output_offset
;
2840 r_symndx
= ELF_R_SYM (irela
->r_info
);
2845 if (r_symndx
>= locsymcount
2846 || (elf_bad_symtab (input_bfd
)
2847 && finfo
->sections
[r_symndx
] == NULL
))
2851 /* This is a reloc against a global symbol. We
2852 have not yet output all the local symbols, so
2853 we do not know the symbol index of any global
2854 symbol. We set the rel_hash entry for this
2855 reloc to point to the global hash table entry
2856 for this symbol. The symbol index is then
2857 set at the end of elf_bfd_final_link. */
2858 indx
= r_symndx
- extsymoff
;
2859 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
2861 /* Setting the index to -2 tells
2862 elf_link_output_extsym that this symbol is
2864 BFD_ASSERT ((*rel_hash
)->indx
< 0);
2865 (*rel_hash
)->indx
= -2;
2870 /* This is a reloc against a local symbol. */
2873 isym
= finfo
->internal_syms
+ r_symndx
;
2874 sec
= finfo
->sections
[r_symndx
];
2875 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
2877 /* I suppose the backend ought to fill in the
2878 section of any STT_SECTION symbol against a
2879 processor specific section. */
2880 if (sec
!= NULL
&& bfd_is_abs_section (sec
))
2882 else if (sec
== NULL
|| sec
->owner
== NULL
)
2884 bfd_set_error (bfd_error_bad_value
);
2889 r_symndx
= sec
->output_section
->target_index
;
2890 BFD_ASSERT (r_symndx
!= 0);
2895 if (finfo
->indices
[r_symndx
] == -1)
2901 if (finfo
->info
->strip
== strip_all
)
2903 /* You can't do ld -r -s. */
2904 bfd_set_error (bfd_error_invalid_operation
);
2908 /* This symbol was skipped earlier, but
2909 since it is needed by a reloc, we
2910 must output it now. */
2911 link
= symtab_hdr
->sh_link
;
2912 name
= bfd_elf_string_from_elf_section (input_bfd
,
2918 osec
= sec
->output_section
;
2920 _bfd_elf_section_from_bfd_section (output_bfd
,
2922 if (isym
->st_shndx
== (unsigned short) -1)
2925 isym
->st_value
+= sec
->output_offset
;
2926 if (! finfo
->info
->relocateable
)
2927 isym
->st_value
+= osec
->vma
;
2929 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
2931 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
2935 r_symndx
= finfo
->indices
[r_symndx
];
2938 irela
->r_info
= ELF_R_INFO (r_symndx
,
2939 ELF_R_TYPE (irela
->r_info
));
2942 /* Swap out the relocs. */
2943 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2944 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
2945 BFD_ASSERT (output_rel_hdr
->sh_entsize
2946 == input_rel_hdr
->sh_entsize
);
2947 irela
= internal_relocs
;
2948 irelaend
= irela
+ o
->reloc_count
;
2949 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2951 Elf_External_Rel
*erel
;
2953 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
2954 + o
->output_section
->reloc_count
);
2955 for (; irela
< irelaend
; irela
++, erel
++)
2957 Elf_Internal_Rel irel
;
2959 irel
.r_offset
= irela
->r_offset
;
2960 irel
.r_info
= irela
->r_info
;
2961 BFD_ASSERT (irela
->r_addend
== 0);
2962 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
2967 Elf_External_Rela
*erela
;
2969 BFD_ASSERT (input_rel_hdr
->sh_entsize
2970 == sizeof (Elf_External_Rela
));
2971 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
2972 + o
->output_section
->reloc_count
);
2973 for (; irela
< irelaend
; irela
++, erela
++)
2974 elf_swap_reloca_out (output_bfd
, irela
, erela
);
2977 o
->output_section
->reloc_count
+= o
->reloc_count
;
2981 /* Write out the modified section contents. */
2982 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
2983 finfo
->contents
, o
->output_offset
,
2984 (o
->_cooked_size
!= 0
2993 /* Generate a reloc when linking an ELF file. This is a reloc
2994 requested by the linker, and does come from any input file. This
2995 is used to build constructor and destructor tables when linking
2999 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
3001 struct bfd_link_info
*info
;
3002 asection
*output_section
;
3003 struct bfd_link_order
*link_order
;
3005 reloc_howto_type
*howto
;
3009 struct elf_link_hash_entry
**rel_hash_ptr
;
3010 Elf_Internal_Shdr
*rel_hdr
;
3012 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
3015 bfd_set_error (bfd_error_bad_value
);
3019 addend
= link_order
->u
.reloc
.p
->addend
;
3021 /* Figure out the symbol index. */
3022 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
3023 + output_section
->reloc_count
);
3024 if (link_order
->type
== bfd_section_reloc_link_order
)
3026 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
3027 BFD_ASSERT (indx
!= 0);
3028 *rel_hash_ptr
= NULL
;
3032 struct elf_link_hash_entry
*h
;
3034 /* Treat a reloc against a defined symbol as though it were
3035 actually against the section. */
3036 h
= elf_link_hash_lookup (elf_hash_table (info
),
3037 link_order
->u
.reloc
.p
->u
.name
,
3038 false, false, true);
3040 && (h
->root
.type
== bfd_link_hash_defined
3041 || h
->root
.type
== bfd_link_hash_defweak
))
3045 section
= h
->root
.u
.def
.section
;
3046 indx
= section
->output_section
->target_index
;
3047 *rel_hash_ptr
= NULL
;
3048 /* It seems that we ought to add the symbol value to the
3049 addend here, but in practice it has already been added
3050 because it was passed to constructor_callback. */
3051 addend
+= section
->output_section
->vma
+ section
->output_offset
;
3055 /* Setting the index to -2 tells elf_link_output_extsym that
3056 this symbol is used by a reloc. */
3063 if (! ((*info
->callbacks
->unattached_reloc
)
3064 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
3065 (asection
*) NULL
, (bfd_vma
) 0)))
3071 /* If this is an inplace reloc, we must write the addend into the
3073 if (howto
->partial_inplace
&& addend
!= 0)
3076 bfd_reloc_status_type rstat
;
3080 size
= bfd_get_reloc_size (howto
);
3081 buf
= (bfd_byte
*) bfd_zmalloc (size
);
3082 if (buf
== (bfd_byte
*) NULL
)
3084 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
3090 case bfd_reloc_outofrange
:
3092 case bfd_reloc_overflow
:
3093 if (! ((*info
->callbacks
->reloc_overflow
)
3095 (link_order
->type
== bfd_section_reloc_link_order
3096 ? bfd_section_name (output_bfd
,
3097 link_order
->u
.reloc
.p
->u
.section
)
3098 : link_order
->u
.reloc
.p
->u
.name
),
3099 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
3107 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
3108 (file_ptr
) link_order
->offset
, size
);
3114 /* The address of a reloc is relative to the section in a
3115 relocateable file, and is a virtual address in an executable
3117 offset
= link_order
->offset
;
3118 if (! info
->relocateable
)
3119 offset
+= output_section
->vma
;
3121 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
3123 if (rel_hdr
->sh_type
== SHT_REL
)
3125 Elf_Internal_Rel irel
;
3126 Elf_External_Rel
*erel
;
3128 irel
.r_offset
= offset
;
3129 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3130 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
3131 + output_section
->reloc_count
);
3132 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3136 Elf_Internal_Rela irela
;
3137 Elf_External_Rela
*erela
;
3139 irela
.r_offset
= offset
;
3140 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3141 irela
.r_addend
= addend
;
3142 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
3143 + output_section
->reloc_count
);
3144 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
3147 ++output_section
->reloc_count
;
3153 /* Allocate a pointer to live in a linker created section. */
3156 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
3158 struct bfd_link_info
*info
;
3159 elf_linker_section_t
*lsect
;
3160 struct elf_link_hash_entry
*h
;
3161 const Elf_Internal_Rela
*rel
;
3163 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
3164 elf_linker_section_pointers_t
*linker_section_ptr
;
3165 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
3167 BFD_ASSERT (lsect
!= NULL
);
3169 /* Is this a global symbol? */
3172 /* Has this symbol already been allocated, if so, our work is done */
3173 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3178 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
3179 /* Make sure this symbol is output as a dynamic symbol. */
3180 if (h
->dynindx
== -1)
3182 if (! elf_link_record_dynamic_symbol (info
, h
))
3186 if (lsect
->rel_section
)
3187 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3190 else /* Allocation of a pointer to a local symbol */
3192 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
3194 /* Allocate a table to hold the local symbols if first time */
3197 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
3198 register unsigned int i
;
3200 ptr
= (elf_linker_section_pointers_t
**)
3201 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
3206 elf_local_ptr_offsets (abfd
) = ptr
;
3207 for (i
= 0; i
< num_symbols
; i
++)
3208 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
3211 /* Has this symbol already been allocated, if so, our work is done */
3212 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
3217 ptr_linker_section_ptr
= &ptr
[r_symndx
];
3221 /* If we are generating a shared object, we need to
3222 output a R_<xxx>_RELATIVE reloc so that the
3223 dynamic linker can adjust this GOT entry. */
3224 BFD_ASSERT (lsect
->rel_section
!= NULL
);
3225 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3229 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
3230 from internal memory. */
3231 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
3232 linker_section_ptr
= (elf_linker_section_pointers_t
*)
3233 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
3235 if (!linker_section_ptr
)
3238 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
3239 linker_section_ptr
->addend
= rel
->r_addend
;
3240 linker_section_ptr
->which
= lsect
->which
;
3241 linker_section_ptr
->written_address_p
= false;
3242 *ptr_linker_section_ptr
= linker_section_ptr
;
3244 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
3246 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
;
3247 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
3248 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
3249 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
3250 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
3253 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
3255 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
3258 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
3259 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
3267 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
3270 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
3273 /* Fill in the address for a pointer generated in alinker section. */
3276 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
3279 struct bfd_link_info
*info
;
3280 elf_linker_section_t
*lsect
;
3281 struct elf_link_hash_entry
*h
;
3283 const Elf_Internal_Rela
*rel
;
3286 elf_linker_section_pointers_t
*linker_section_ptr
;
3288 BFD_ASSERT (lsect
!= NULL
);
3290 if (h
!= NULL
) /* global symbol */
3292 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3296 BFD_ASSERT (linker_section_ptr
!= NULL
);
3298 if (! elf_hash_table (info
)->dynamic_sections_created
3301 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
3303 /* This is actually a static link, or it is a
3304 -Bsymbolic link and the symbol is defined
3305 locally. We must initialize this entry in the
3308 When doing a dynamic link, we create a .rela.<xxx>
3309 relocation entry to initialize the value. This
3310 is done in the finish_dynamic_symbol routine. */
3311 if (!linker_section_ptr
->written_address_p
)
3313 linker_section_ptr
->written_address_p
= true;
3314 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3315 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3319 else /* local symbol */
3321 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
3322 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
3323 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
3324 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
3328 BFD_ASSERT (linker_section_ptr
!= NULL
);
3330 /* Write out pointer if it hasn't been rewritten out before */
3331 if (!linker_section_ptr
->written_address_p
)
3333 linker_section_ptr
->written_address_p
= true;
3334 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3335 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3339 asection
*srel
= lsect
->rel_section
;
3340 Elf_Internal_Rela outrel
;
3342 /* We need to generate a relative reloc for the dynamic linker. */
3344 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
3347 BFD_ASSERT (srel
!= NULL
);
3349 outrel
.r_offset
= (lsect
->section
->output_section
->vma
3350 + lsect
->section
->output_offset
3351 + linker_section_ptr
->offset
);
3352 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
3353 outrel
.r_addend
= 0;
3354 elf_swap_reloca_out (output_bfd
, &outrel
,
3355 (((Elf_External_Rela
*)
3356 lsect
->section
->contents
)
3357 + lsect
->section
->reloc_count
));
3358 ++lsect
->section
->reloc_count
;
3363 relocation
= (lsect
->section
->output_offset
3364 + linker_section_ptr
->offset
3365 - lsect
->hole_offset
3366 - lsect
->sym_offset
);
3369 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
3370 lsect
->name
, (long)relocation
, (long)relocation
);
3373 /* Subtract out the addend, because it will get added back in by the normal
3375 return relocation
- linker_section_ptr
->addend
;