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_name, we use that. Otherwise, we just use the file
384 name. If the generic linker put a null string into
385 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
386 there is a DT_SONAME entry. */
388 name
= bfd_get_filename (abfd
);
389 if (elf_dt_name (abfd
) != NULL
)
391 name
= elf_dt_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 (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
))
524 /* Save the SONAME, if there is one, because sometimes the
525 linker emulation code will need to know it. */
527 name
= bfd_get_filename (abfd
);
528 elf_dt_name (abfd
) = name
;
532 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
534 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
535 != extsymcount
* sizeof (Elf_External_Sym
)))
540 esymend
= buf
+ extsymcount
;
541 for (esym
= buf
; esym
< esymend
; esym
++, sym_hash
++)
543 Elf_Internal_Sym sym
;
549 struct elf_link_hash_entry
*h
;
551 boolean size_change_ok
, type_change_ok
;
554 elf_swap_symbol_in (abfd
, esym
, &sym
);
556 flags
= BSF_NO_FLAGS
;
558 value
= sym
.st_value
;
561 bind
= ELF_ST_BIND (sym
.st_info
);
562 if (bind
== STB_LOCAL
)
564 /* This should be impossible, since ELF requires that all
565 global symbols follow all local symbols, and that sh_info
566 point to the first global symbol. Unfortunatealy, Irix 5
570 else if (bind
== STB_GLOBAL
)
572 if (sym
.st_shndx
!= SHN_UNDEF
573 && sym
.st_shndx
!= SHN_COMMON
)
578 else if (bind
== STB_WEAK
)
582 /* Leave it up to the processor backend. */
585 if (sym
.st_shndx
== SHN_UNDEF
)
586 sec
= bfd_und_section_ptr
;
587 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
589 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
593 sec
= bfd_abs_section_ptr
;
595 else if (sym
.st_shndx
== SHN_ABS
)
596 sec
= bfd_abs_section_ptr
;
597 else if (sym
.st_shndx
== SHN_COMMON
)
599 sec
= bfd_com_section_ptr
;
600 /* What ELF calls the size we call the value. What ELF
601 calls the value we call the alignment. */
606 /* Leave it up to the processor backend. */
609 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
610 if (name
== (const char *) NULL
)
615 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
619 /* The hook function sets the name to NULL if this symbol
620 should be skipped for some reason. */
621 if (name
== (const char *) NULL
)
625 /* Sanity check that all possibilities were handled. */
626 if (sec
== (asection
*) NULL
)
628 bfd_set_error (bfd_error_bad_value
);
632 if (bfd_is_und_section (sec
)
633 || bfd_is_com_section (sec
))
638 size_change_ok
= false;
639 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
640 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
642 /* We need to look up the symbol now in order to get some of
643 the dynamic object handling right. We pass the hash
644 table entry in to _bfd_generic_link_add_one_symbol so
645 that it does not have to look it up again. */
646 if (! bfd_is_und_section (sec
))
647 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
650 h
= ((struct elf_link_hash_entry
*)
651 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true,
657 if (h
->root
.type
== bfd_link_hash_new
)
658 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
660 while (h
->root
.type
== bfd_link_hash_indirect
661 || h
->root
.type
== bfd_link_hash_warning
)
662 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
664 /* It's OK to change the type if it used to be a weak
666 if (h
->root
.type
== bfd_link_hash_defweak
667 || h
->root
.type
== bfd_link_hash_undefweak
)
668 type_change_ok
= true;
670 /* It's OK to change the size if it used to be a weak
671 definition, or if it used to be undefined, or if we will
672 be overriding an old definition. */
674 || h
->root
.type
== bfd_link_hash_undefined
)
675 size_change_ok
= true;
677 /* If we are looking at a dynamic object, and this is a
678 definition, we need to see if it has already been defined
679 by some other object. If it has, we want to use the
680 existing definition, and we do not want to report a
681 multiple symbol definition error; we do this by
682 clobbering sec to be bfd_und_section_ptr. */
683 if (dynamic
&& definition
)
685 if (h
->root
.type
== bfd_link_hash_defined
686 || h
->root
.type
== bfd_link_hash_defweak
687 || (h
->root
.type
== bfd_link_hash_common
688 && bind
== STB_WEAK
))
690 sec
= bfd_und_section_ptr
;
692 size_change_ok
= true;
696 /* Similarly, if we are not looking at a dynamic object, and
697 we have a definition, we want to override any definition
698 we may have from a dynamic object. Symbols from regular
699 files always take precedence over symbols from dynamic
700 objects, even if they are defined after the dynamic
701 object in the link. */
704 && (h
->root
.type
== bfd_link_hash_defined
705 || h
->root
.type
== bfd_link_hash_defweak
)
706 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
707 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
708 == bfd_target_elf_flavour
)
709 && (elf_elfheader (h
->root
.u
.def
.section
->owner
)->e_type
712 /* Change the hash table entry to undefined, and let
713 _bfd_generic_link_add_one_symbol do the right thing
714 with the new definition. */
715 h
->root
.type
= bfd_link_hash_undefined
;
716 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
717 size_change_ok
= true;
721 if (! (_bfd_generic_link_add_one_symbol
722 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
723 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
727 while (h
->root
.type
== bfd_link_hash_indirect
728 || h
->root
.type
== bfd_link_hash_warning
)
729 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
735 && (flags
& BSF_WEAK
) != 0
736 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
737 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
738 && h
->weakdef
== NULL
)
740 /* Keep a list of all weak defined non function symbols from
741 a dynamic object, using the weakdef field. Later in this
742 function we will set the weakdef field to the correct
743 value. We only put non-function symbols from dynamic
744 objects on this list, because that happens to be the only
745 time we need to know the normal symbol corresponding to a
746 weak symbol, and the information is time consuming to
747 figure out. If the weakdef field is not already NULL,
748 then this symbol was already defined by some previous
749 dynamic object, and we will be using that previous
750 definition anyhow. */
757 /* Get the alignment of a common symbol. */
758 if (sym
.st_shndx
== SHN_COMMON
759 && h
->root
.type
== bfd_link_hash_common
)
760 h
->root
.u
.c
.p
->alignment_power
= bfd_log2 (sym
.st_value
);
762 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
768 /* Remember the symbol size and type. */
770 && (definition
|| h
->size
== 0))
772 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
773 (*_bfd_error_handler
)
774 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
775 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
776 bfd_get_filename (abfd
));
778 h
->size
= sym
.st_size
;
780 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
781 && (definition
|| h
->type
== STT_NOTYPE
))
783 if (h
->type
!= STT_NOTYPE
784 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
786 (*_bfd_error_handler
)
787 ("Warning: type of symbol `%s' changed from %d to %d in %s",
788 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
789 bfd_get_filename (abfd
));
791 h
->type
= ELF_ST_TYPE (sym
.st_info
);
794 /* Set a flag in the hash table entry indicating the type of
795 reference or definition we just found. Keep a count of
796 the number of dynamic symbols we find. A dynamic symbol
797 is one which is referenced or defined by both a regular
798 object and a shared object, or one which is referenced or
799 defined by more than one shared object. */
800 old_flags
= h
->elf_link_hash_flags
;
805 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
807 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
809 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
810 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
816 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
818 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
819 if ((old_flags
& new_flag
) != 0
820 || (old_flags
& (ELF_LINK_HASH_DEF_REGULAR
821 | ELF_LINK_HASH_REF_REGULAR
)) != 0
822 || (h
->weakdef
!= NULL
823 && (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
824 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0))
828 h
->elf_link_hash_flags
|= new_flag
;
829 if (dynsym
&& h
->dynindx
== -1)
831 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
833 if (h
->weakdef
!= NULL
835 && h
->weakdef
->dynindx
== -1)
837 if (! _bfd_elf_link_record_dynamic_symbol (info
,
845 /* Now set the weakdefs field correctly for all the weak defined
846 symbols we found. The only way to do this is to search all the
847 symbols. Since we only need the information for non functions in
848 dynamic objects, that's the only time we actually put anything on
849 the list WEAKS. We need this information so that if a regular
850 object refers to a symbol defined weakly in a dynamic object, the
851 real symbol in the dynamic object is also put in the dynamic
852 symbols; we also must arrange for both symbols to point to the
853 same memory location. We could handle the general case of symbol
854 aliasing, but a general symbol alias can only be generated in
855 assembler code, handling it correctly would be very time
856 consuming, and other ELF linkers don't handle general aliasing
858 while (weaks
!= NULL
)
860 struct elf_link_hash_entry
*hlook
;
863 struct elf_link_hash_entry
**hpp
;
864 struct elf_link_hash_entry
**hppend
;
867 weaks
= hlook
->weakdef
;
868 hlook
->weakdef
= NULL
;
870 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
871 || hlook
->root
.type
== bfd_link_hash_defweak
872 || hlook
->root
.type
== bfd_link_hash_common
873 || hlook
->root
.type
== bfd_link_hash_indirect
);
874 slook
= hlook
->root
.u
.def
.section
;
875 vlook
= hlook
->root
.u
.def
.value
;
877 hpp
= elf_sym_hashes (abfd
);
878 hppend
= hpp
+ extsymcount
;
879 for (; hpp
< hppend
; hpp
++)
881 struct elf_link_hash_entry
*h
;
884 if (h
!= NULL
&& h
!= hlook
885 && h
->root
.type
== bfd_link_hash_defined
886 && h
->root
.u
.def
.section
== slook
887 && h
->root
.u
.def
.value
== vlook
)
891 /* If the weak definition is in the list of dynamic
892 symbols, make sure the real definition is put there
894 if (hlook
->dynindx
!= -1
897 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
912 /* If this object is the same format as the output object, and it is
913 not a shared library, then let the backend look through the
916 This is required to build global offset table entries and to
917 arrange for dynamic relocs. It is not required for the
918 particular common case of linking non PIC code, even when linking
919 against shared libraries, but unfortunately there is no way of
920 knowing whether an object file has been compiled PIC or not.
921 Looking through the relocs is not particularly time consuming.
922 The problem is that we must either (1) keep the relocs in memory,
923 which causes the linker to require additional runtime memory or
924 (2) read the relocs twice from the input file, which wastes time.
925 This would be a good case for using mmap.
927 I have no idea how to handle linking PIC code into a file of a
928 different format. It probably can't be done. */
929 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
931 && abfd
->xvec
== info
->hash
->creator
932 && check_relocs
!= NULL
)
936 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
938 Elf_Internal_Rela
*internal_relocs
;
941 if ((o
->flags
& SEC_RELOC
) == 0
942 || o
->reloc_count
== 0)
945 /* I believe we can ignore the relocs for any section which
946 does not form part of the final process image, such as a
947 debugging section. */
948 if ((o
->flags
& SEC_ALLOC
) == 0)
951 internal_relocs
= elf_link_read_relocs (abfd
, o
, (PTR
) NULL
,
952 (Elf_Internal_Rela
*) NULL
,
954 if (internal_relocs
== NULL
)
957 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
959 if (! info
->keep_memory
)
960 free (internal_relocs
);
977 /* Create some sections which will be filled in with dynamic linking
978 information. ABFD is an input file which requires dynamic sections
979 to be created. The dynamic sections take up virtual memory space
980 when the final executable is run, so we need to create them before
981 addresses are assigned to the output sections. We work out the
982 actual contents and size of these sections later. */
985 elf_link_create_dynamic_sections (abfd
, info
)
987 struct bfd_link_info
*info
;
990 register asection
*s
;
991 struct elf_link_hash_entry
*h
;
992 struct elf_backend_data
*bed
;
994 if (elf_hash_table (info
)->dynamic_sections_created
)
997 /* Make sure that all dynamic sections use the same input BFD. */
998 if (elf_hash_table (info
)->dynobj
== NULL
)
999 elf_hash_table (info
)->dynobj
= abfd
;
1001 abfd
= elf_hash_table (info
)->dynobj
;
1003 /* Note that we set the SEC_IN_MEMORY flag for all of these
1005 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
;
1007 /* A dynamically linked executable has a .interp section, but a
1008 shared library does not. */
1011 s
= bfd_make_section (abfd
, ".interp");
1013 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1017 s
= bfd_make_section (abfd
, ".dynsym");
1019 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1020 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1023 s
= bfd_make_section (abfd
, ".dynstr");
1025 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1028 /* Create a strtab to hold the dynamic symbol names. */
1029 if (elf_hash_table (info
)->dynstr
== NULL
)
1031 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1032 if (elf_hash_table (info
)->dynstr
== NULL
)
1036 s
= bfd_make_section (abfd
, ".dynamic");
1038 || ! bfd_set_section_flags (abfd
, s
, flags
)
1039 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1042 /* The special symbol _DYNAMIC is always set to the start of the
1043 .dynamic section. This call occurs before we have processed the
1044 symbols for any dynamic object, so we don't have to worry about
1045 overriding a dynamic definition. We could set _DYNAMIC in a
1046 linker script, but we only want to define it if we are, in fact,
1047 creating a .dynamic section. We don't want to define it if there
1048 is no .dynamic section, since on some ELF platforms the start up
1049 code examines it to decide how to initialize the process. */
1051 if (! (_bfd_generic_link_add_one_symbol
1052 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1053 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1054 (struct bfd_link_hash_entry
**) &h
)))
1056 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1057 h
->type
= STT_OBJECT
;
1060 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1063 s
= bfd_make_section (abfd
, ".hash");
1065 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1066 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1069 /* Let the backend create the rest of the sections. This lets the
1070 backend set the right flags. The backend will normally create
1071 the .got and .plt sections. */
1072 bed
= get_elf_backend_data (abfd
);
1073 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1076 elf_hash_table (info
)->dynamic_sections_created
= true;
1081 /* Add an entry to the .dynamic table. */
1084 elf_add_dynamic_entry (info
, tag
, val
)
1085 struct bfd_link_info
*info
;
1089 Elf_Internal_Dyn dyn
;
1093 bfd_byte
*newcontents
;
1095 dynobj
= elf_hash_table (info
)->dynobj
;
1097 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1098 BFD_ASSERT (s
!= NULL
);
1100 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1101 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1102 if (newcontents
== NULL
)
1106 dyn
.d_un
.d_val
= val
;
1107 elf_swap_dyn_out (dynobj
, &dyn
,
1108 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1110 s
->_raw_size
= newsize
;
1111 s
->contents
= newcontents
;
1117 /* Read and swap the relocs for a section. They may have been cached.
1118 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1119 they are used as buffers to read into. They are known to be large
1120 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1121 value is allocated using either malloc or bfd_alloc, according to
1122 the KEEP_MEMORY argument. */
1124 static Elf_Internal_Rela
*
1125 elf_link_read_relocs (abfd
, o
, external_relocs
, internal_relocs
, keep_memory
)
1128 PTR external_relocs
;
1129 Elf_Internal_Rela
*internal_relocs
;
1130 boolean keep_memory
;
1132 Elf_Internal_Shdr
*rel_hdr
;
1134 Elf_Internal_Rela
*alloc2
= NULL
;
1136 if (elf_section_data (o
)->relocs
!= NULL
)
1137 return elf_section_data (o
)->relocs
;
1139 if (o
->reloc_count
== 0)
1142 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1144 if (internal_relocs
== NULL
)
1148 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1150 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1152 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1153 if (internal_relocs
== NULL
)
1157 if (external_relocs
== NULL
)
1159 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1162 external_relocs
= alloc1
;
1165 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1166 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1167 != rel_hdr
->sh_size
))
1170 /* Swap in the relocs. For convenience, we always produce an
1171 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1173 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1175 Elf_External_Rel
*erel
;
1176 Elf_External_Rel
*erelend
;
1177 Elf_Internal_Rela
*irela
;
1179 erel
= (Elf_External_Rel
*) external_relocs
;
1180 erelend
= erel
+ o
->reloc_count
;
1181 irela
= internal_relocs
;
1182 for (; erel
< erelend
; erel
++, irela
++)
1184 Elf_Internal_Rel irel
;
1186 elf_swap_reloc_in (abfd
, erel
, &irel
);
1187 irela
->r_offset
= irel
.r_offset
;
1188 irela
->r_info
= irel
.r_info
;
1189 irela
->r_addend
= 0;
1194 Elf_External_Rela
*erela
;
1195 Elf_External_Rela
*erelaend
;
1196 Elf_Internal_Rela
*irela
;
1198 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1200 erela
= (Elf_External_Rela
*) external_relocs
;
1201 erelaend
= erela
+ o
->reloc_count
;
1202 irela
= internal_relocs
;
1203 for (; erela
< erelaend
; erela
++, irela
++)
1204 elf_swap_reloca_in (abfd
, erela
, irela
);
1207 /* Cache the results for next time, if we can. */
1209 elf_section_data (o
)->relocs
= internal_relocs
;
1214 /* Don't free alloc2, since if it was allocated we are passing it
1215 back (under the name of internal_relocs). */
1217 return internal_relocs
;
1228 /* Record an assignment to a symbol made by a linker script. We need
1229 this in case some dynamic object refers to this symbol. */
1233 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1235 struct bfd_link_info
*info
;
1239 struct elf_link_hash_entry
*h
;
1241 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1244 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1248 if (h
->root
.type
== bfd_link_hash_new
)
1249 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
1251 /* If this symbol is being provided by the linker script, and it is
1252 currently defined by a dynamic object, but not by a regular
1253 object, then mark it as undefined so that the generic linker will
1254 force the correct value. */
1256 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1257 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1258 h
->root
.type
= bfd_link_hash_undefined
;
1260 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1261 h
->type
= STT_OBJECT
;
1263 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1264 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1266 && h
->dynindx
== -1)
1268 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1271 /* If this is a weak defined symbol, and we know a corresponding
1272 real symbol from the same dynamic object, make sure the real
1273 symbol is also made into a dynamic symbol. */
1274 if (h
->weakdef
!= NULL
1275 && h
->weakdef
->dynindx
== -1)
1277 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1286 /* Array used to determine the number of hash table buckets to use
1287 based on the number of symbols there are. If there are fewer than
1288 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1289 fewer than 37 we use 17 buckets, and so forth. We never use more
1290 than 521 buckets. */
1292 static const size_t elf_buckets
[] =
1294 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 0
1297 /* Set up the sizes and contents of the ELF dynamic sections. This is
1298 called by the ELF linker emulation before_allocation routine. We
1299 must set the sizes of the sections before the linker sets the
1300 addresses of the various sections. */
1303 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
1304 export_dynamic
, info
, sinterpptr
)
1308 boolean export_dynamic
;
1309 struct bfd_link_info
*info
;
1310 asection
**sinterpptr
;
1313 struct elf_backend_data
*bed
;
1317 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1320 dynobj
= elf_hash_table (info
)->dynobj
;
1322 /* If there were no dynamic objects in the link, there is nothing to
1327 /* If we are supposed to export all symbols into the dynamic symbol
1328 table (this is not the normal case), then do so. */
1331 struct elf_info_failed eif
;
1335 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
1341 if (elf_hash_table (info
)->dynamic_sections_created
)
1343 struct elf_info_failed eif
;
1344 struct elf_link_hash_entry
*h
;
1345 bfd_size_type strsize
;
1347 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
1348 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
1354 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, soname
,
1356 if (indx
== (bfd_size_type
) -1
1357 || ! elf_add_dynamic_entry (info
, DT_SONAME
, indx
))
1363 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
1371 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
1373 if (indx
== (bfd_size_type
) -1
1374 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
1378 /* Find all symbols which were defined in a dynamic object and make
1379 the backend pick a reasonable value for them. */
1382 elf_link_hash_traverse (elf_hash_table (info
),
1383 elf_adjust_dynamic_symbol
,
1388 /* Add some entries to the .dynamic section. We fill in some of the
1389 values later, in elf_bfd_final_link, but we must add the entries
1390 now so that we know the final size of the .dynamic section. */
1391 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
1394 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1395 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1397 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
1400 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
1403 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1404 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1406 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
1409 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1410 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
1411 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
1412 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
1413 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
1414 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
1415 sizeof (Elf_External_Sym
)))
1419 /* The backend must work out the sizes of all the other dynamic
1421 bed
= get_elf_backend_data (output_bfd
);
1422 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
1425 if (elf_hash_table (info
)->dynamic_sections_created
)
1430 size_t bucketcount
= 0;
1431 Elf_Internal_Sym isym
;
1433 /* Set the size of the .dynsym and .hash sections. We counted
1434 the number of dynamic symbols in elf_link_add_object_symbols.
1435 We will build the contents of .dynsym and .hash when we build
1436 the final symbol table, because until then we do not know the
1437 correct value to give the symbols. We built the .dynstr
1438 section as we went along in elf_link_add_object_symbols. */
1439 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
1440 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
1441 BFD_ASSERT (s
!= NULL
);
1442 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
1443 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1444 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
1447 /* The first entry in .dynsym is a dummy symbol. */
1454 elf_swap_symbol_out (output_bfd
, &isym
,
1455 (PTR
) (Elf_External_Sym
*) s
->contents
);
1457 for (i
= 0; elf_buckets
[i
] != 0; i
++)
1459 bucketcount
= elf_buckets
[i
];
1460 if (dynsymcount
< elf_buckets
[i
+ 1])
1464 s
= bfd_get_section_by_name (dynobj
, ".hash");
1465 BFD_ASSERT (s
!= NULL
);
1466 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
1467 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1468 if (s
->contents
== NULL
)
1470 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
1472 put_word (output_bfd
, bucketcount
, s
->contents
);
1473 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
1475 elf_hash_table (info
)->bucketcount
= bucketcount
;
1477 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
1478 BFD_ASSERT (s
!= NULL
);
1479 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1481 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
1489 /* This routine is used to export all defined symbols into the dynamic
1490 symbol table. It is called via elf_link_hash_traverse. */
1493 elf_export_symbol (h
, data
)
1494 struct elf_link_hash_entry
*h
;
1497 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1499 if (h
->dynindx
== -1
1500 && (h
->elf_link_hash_flags
1501 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
1503 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1514 /* Make the backend pick a good value for a dynamic symbol. This is
1515 called via elf_link_hash_traverse, and also calls itself
1519 elf_adjust_dynamic_symbol (h
, data
)
1520 struct elf_link_hash_entry
*h
;
1523 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1525 struct elf_backend_data
*bed
;
1527 /* If this symbol was mentioned in a non-ELF file, try to set
1528 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
1529 permit a non-ELF file to correctly refer to a symbol defined in
1530 an ELF dynamic object. */
1531 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
1533 if (h
->root
.type
!= bfd_link_hash_defined
1534 && h
->root
.type
!= bfd_link_hash_defweak
)
1535 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1538 if (h
->root
.u
.def
.section
->owner
!= NULL
1539 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
1540 == bfd_target_elf_flavour
))
1541 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1543 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1546 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1547 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
1549 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1557 /* If this is a final link, and the symbol was defined as a common
1558 symbol in a regular object file, and there was no definition in
1559 any dynamic object, then the linker will have allocated space for
1560 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
1561 flag will not have been set. */
1562 if (h
->root
.type
== bfd_link_hash_defined
1563 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
1564 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
1565 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1566 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
1567 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1569 /* If -Bsymbolic was used (which means to bind references to global
1570 symbols to the definition within the shared object), and this
1571 symbol was defined in a regular object, then it actually doesn't
1572 need a PLT entry. */
1573 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
1574 && eif
->info
->shared
1575 && eif
->info
->symbolic
1576 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1577 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
1579 /* If this symbol does not require a PLT entry, and it is not
1580 defined by a dynamic object, or is not referenced by a regular
1581 object, ignore it. We do have to handle a weak defined symbol,
1582 even if no regular object refers to it, if we decided to add it
1583 to the dynamic symbol table. FIXME: Do we normally need to worry
1584 about symbols which are defined by one dynamic object and
1585 referenced by another one? */
1586 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
1587 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
1588 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1589 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
1590 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
1593 /* If we've already adjusted this symbol, don't do it again. This
1594 can happen via a recursive call. */
1595 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
1598 /* Don't look at this symbol again. Note that we must set this
1599 after checking the above conditions, because we may look at a
1600 symbol once, decide not to do anything, and then get called
1601 recursively later after REF_REGULAR is set below. */
1602 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
1604 /* If this is a weak definition, and we know a real definition, and
1605 the real symbol is not itself defined by a regular object file,
1606 then get a good value for the real definition. We handle the
1607 real symbol first, for the convenience of the backend routine.
1609 Note that there is a confusing case here. If the real definition
1610 is defined by a regular object file, we don't get the real symbol
1611 from the dynamic object, but we do get the weak symbol. If the
1612 processor backend uses a COPY reloc, then if some routine in the
1613 dynamic object changes the real symbol, we will not see that
1614 change in the corresponding weak symbol. This is the way other
1615 ELF linkers work as well, and seems to be a result of the shared
1618 I will clarify this issue. Most SVR4 shared libraries define the
1619 variable _timezone and define timezone as a weak synonym. The
1620 tzset call changes _timezone. If you write
1621 extern int timezone;
1623 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
1624 you might expect that, since timezone is a synonym for _timezone,
1625 the same number will print both times. However, if the processor
1626 backend uses a COPY reloc, then actually timezone will be copied
1627 into your process image, and, since you define _timezone
1628 yourself, _timezone will not. Thus timezone and _timezone will
1629 wind up at different memory locations. The tzset call will set
1630 _timezone, leaving timezone unchanged. */
1632 if (h
->weakdef
!= NULL
)
1634 struct elf_link_hash_entry
*weakdef
;
1636 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
1637 || h
->root
.type
== bfd_link_hash_defweak
);
1638 weakdef
= h
->weakdef
;
1639 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
1640 || weakdef
->root
.type
== bfd_link_hash_defweak
);
1641 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
1642 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1644 /* This symbol is defined by a regular object file, so we
1645 will not do anything special. Clear weakdef for the
1646 convenience of the processor backend. */
1651 /* There is an implicit reference by a regular object file
1652 via the weak symbol. */
1653 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1654 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
1659 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
1660 bed
= get_elf_backend_data (dynobj
);
1661 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
1670 /* Final phase of ELF linker. */
1672 /* A structure we use to avoid passing large numbers of arguments. */
1674 struct elf_final_link_info
1676 /* General link information. */
1677 struct bfd_link_info
*info
;
1680 /* Symbol string table. */
1681 struct bfd_strtab_hash
*symstrtab
;
1682 /* .dynsym section. */
1683 asection
*dynsym_sec
;
1684 /* .hash section. */
1686 /* Buffer large enough to hold contents of any section. */
1688 /* Buffer large enough to hold external relocs of any section. */
1689 PTR external_relocs
;
1690 /* Buffer large enough to hold internal relocs of any section. */
1691 Elf_Internal_Rela
*internal_relocs
;
1692 /* Buffer large enough to hold external local symbols of any input
1694 Elf_External_Sym
*external_syms
;
1695 /* Buffer large enough to hold internal local symbols of any input
1697 Elf_Internal_Sym
*internal_syms
;
1698 /* Array large enough to hold a symbol index for each local symbol
1699 of any input BFD. */
1701 /* Array large enough to hold a section pointer for each local
1702 symbol of any input BFD. */
1703 asection
**sections
;
1704 /* Buffer to hold swapped out symbols. */
1705 Elf_External_Sym
*symbuf
;
1706 /* Number of swapped out symbols in buffer. */
1707 size_t symbuf_count
;
1708 /* Number of symbols which fit in symbuf. */
1712 static boolean elf_link_output_sym
1713 PARAMS ((struct elf_final_link_info
*, const char *,
1714 Elf_Internal_Sym
*, asection
*));
1715 static boolean elf_link_flush_output_syms
1716 PARAMS ((struct elf_final_link_info
*));
1717 static boolean elf_link_output_extsym
1718 PARAMS ((struct elf_link_hash_entry
*, PTR
));
1719 static boolean elf_link_input_bfd
1720 PARAMS ((struct elf_final_link_info
*, bfd
*));
1721 static boolean elf_reloc_link_order
1722 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
1723 struct bfd_link_order
*));
1725 /* This struct is used to pass information to routines called via
1726 elf_link_hash_traverse which must return failure. */
1728 struct elf_finfo_failed
1731 struct elf_final_link_info
*finfo
;
1734 /* Do the final step of an ELF link. */
1737 elf_bfd_final_link (abfd
, info
)
1739 struct bfd_link_info
*info
;
1743 struct elf_final_link_info finfo
;
1744 register asection
*o
;
1745 register struct bfd_link_order
*p
;
1747 size_t max_contents_size
;
1748 size_t max_external_reloc_size
;
1749 size_t max_internal_reloc_count
;
1750 size_t max_sym_count
;
1752 Elf_Internal_Sym elfsym
;
1754 Elf_Internal_Shdr
*symtab_hdr
;
1755 Elf_Internal_Shdr
*symstrtab_hdr
;
1756 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1757 struct elf_finfo_failed eif
;
1760 abfd
->flags
|= DYNAMIC
;
1762 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
1763 dynobj
= elf_hash_table (info
)->dynobj
;
1766 finfo
.output_bfd
= abfd
;
1767 finfo
.symstrtab
= elf_stringtab_init ();
1768 if (finfo
.symstrtab
== NULL
)
1772 finfo
.dynsym_sec
= NULL
;
1773 finfo
.hash_sec
= NULL
;
1777 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
1778 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
1779 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
1781 finfo
.contents
= NULL
;
1782 finfo
.external_relocs
= NULL
;
1783 finfo
.internal_relocs
= NULL
;
1784 finfo
.external_syms
= NULL
;
1785 finfo
.internal_syms
= NULL
;
1786 finfo
.indices
= NULL
;
1787 finfo
.sections
= NULL
;
1788 finfo
.symbuf
= NULL
;
1789 finfo
.symbuf_count
= 0;
1791 /* Count up the number of relocations we will output for each output
1792 section, so that we know the sizes of the reloc sections. We
1793 also figure out some maximum sizes. */
1794 max_contents_size
= 0;
1795 max_external_reloc_size
= 0;
1796 max_internal_reloc_count
= 0;
1798 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
1802 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
1804 if (p
->type
== bfd_section_reloc_link_order
1805 || p
->type
== bfd_symbol_reloc_link_order
)
1807 else if (p
->type
== bfd_indirect_link_order
)
1811 sec
= p
->u
.indirect
.section
;
1813 /* Mark all sections which are to be included in the
1814 link. This will normally be every section. We need
1815 to do this so that we can identify any sections which
1816 the linker has decided to not include. */
1817 sec
->linker_mark
= true;
1819 if (info
->relocateable
)
1820 o
->reloc_count
+= sec
->reloc_count
;
1822 if (sec
->_raw_size
> max_contents_size
)
1823 max_contents_size
= sec
->_raw_size
;
1824 if (sec
->_cooked_size
> max_contents_size
)
1825 max_contents_size
= sec
->_cooked_size
;
1827 /* We are interested in just local symbols, not all
1829 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
)
1833 if (elf_bad_symtab (sec
->owner
))
1834 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
1835 / sizeof (Elf_External_Sym
));
1837 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
1839 if (sym_count
> max_sym_count
)
1840 max_sym_count
= sym_count
;
1842 if ((sec
->flags
& SEC_RELOC
) != 0)
1846 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
1847 if (ext_size
> max_external_reloc_size
)
1848 max_external_reloc_size
= ext_size
;
1849 if (sec
->reloc_count
> max_internal_reloc_count
)
1850 max_internal_reloc_count
= sec
->reloc_count
;
1856 if (o
->reloc_count
> 0)
1857 o
->flags
|= SEC_RELOC
;
1860 /* Explicitly clear the SEC_RELOC flag. The linker tends to
1861 set it (this is probably a bug) and if it is set
1862 assign_section_numbers will create a reloc section. */
1863 o
->flags
&=~ SEC_RELOC
;
1866 /* If the SEC_ALLOC flag is not set, force the section VMA to
1867 zero. This is done in elf_fake_sections as well, but forcing
1868 the VMA to 0 here will ensure that relocs against these
1869 sections are handled correctly. */
1870 if ((o
->flags
& SEC_ALLOC
) == 0)
1874 /* Figure out the file positions for everything but the symbol table
1875 and the relocs. We set symcount to force assign_section_numbers
1876 to create a symbol table. */
1877 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
1878 BFD_ASSERT (! abfd
->output_has_begun
);
1879 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
1882 /* That created the reloc sections. Set their sizes, and assign
1883 them file positions, and allocate some buffers. */
1884 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1886 if ((o
->flags
& SEC_RELOC
) != 0)
1888 Elf_Internal_Shdr
*rel_hdr
;
1889 register struct elf_link_hash_entry
**p
, **pend
;
1891 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1893 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
1895 /* The contents field must last into write_object_contents,
1896 so we allocate it with bfd_alloc rather than malloc. */
1897 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
1898 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
1901 p
= ((struct elf_link_hash_entry
**)
1902 bfd_malloc (o
->reloc_count
1903 * sizeof (struct elf_link_hash_entry
*)));
1904 if (p
== NULL
&& o
->reloc_count
!= 0)
1906 elf_section_data (o
)->rel_hashes
= p
;
1907 pend
= p
+ o
->reloc_count
;
1908 for (; p
< pend
; p
++)
1911 /* Use the reloc_count field as an index when outputting the
1917 _bfd_elf_assign_file_positions_for_relocs (abfd
);
1919 /* We have now assigned file positions for all the sections except
1920 .symtab and .strtab. We start the .symtab section at the current
1921 file position, and write directly to it. We build the .strtab
1922 section in memory. */
1924 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1925 /* sh_name is set in prep_headers. */
1926 symtab_hdr
->sh_type
= SHT_SYMTAB
;
1927 symtab_hdr
->sh_flags
= 0;
1928 symtab_hdr
->sh_addr
= 0;
1929 symtab_hdr
->sh_size
= 0;
1930 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
1931 /* sh_link is set in assign_section_numbers. */
1932 /* sh_info is set below. */
1933 /* sh_offset is set just below. */
1934 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
1936 off
= elf_tdata (abfd
)->next_file_pos
;
1937 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
1939 /* Note that at this point elf_tdata (abfd)->next_file_pos is
1940 incorrect. We do not yet know the size of the .symtab section.
1941 We correct next_file_pos below, after we do know the size. */
1943 /* Allocate a buffer to hold swapped out symbols. This is to avoid
1944 continuously seeking to the right position in the file. */
1945 if (! info
->keep_memory
|| max_sym_count
< 20)
1946 finfo
.symbuf_size
= 20;
1948 finfo
.symbuf_size
= max_sym_count
;
1949 finfo
.symbuf
= ((Elf_External_Sym
*)
1950 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
1951 if (finfo
.symbuf
== NULL
)
1954 /* Start writing out the symbol table. The first symbol is always a
1956 if (info
->strip
!= strip_all
|| info
->relocateable
)
1958 elfsym
.st_value
= 0;
1961 elfsym
.st_other
= 0;
1962 elfsym
.st_shndx
= SHN_UNDEF
;
1963 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
1964 &elfsym
, bfd_und_section_ptr
))
1969 /* Some standard ELF linkers do this, but we don't because it causes
1970 bootstrap comparison failures. */
1971 /* Output a file symbol for the output file as the second symbol.
1972 We output this even if we are discarding local symbols, although
1973 I'm not sure if this is correct. */
1974 elfsym
.st_value
= 0;
1976 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
1977 elfsym
.st_other
= 0;
1978 elfsym
.st_shndx
= SHN_ABS
;
1979 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
1980 &elfsym
, bfd_abs_section_ptr
))
1984 /* Output a symbol for each section. We output these even if we are
1985 discarding local symbols, since they are used for relocs. These
1986 symbols have no names. We store the index of each one in the
1987 index field of the section, so that we can find it again when
1988 outputting relocs. */
1989 if (info
->strip
!= strip_all
|| info
->relocateable
)
1991 elfsym
.st_value
= 0;
1993 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
1994 elfsym
.st_other
= 0;
1995 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
1997 o
= section_from_elf_index (abfd
, i
);
1999 o
->target_index
= abfd
->symcount
;
2000 elfsym
.st_shndx
= i
;
2001 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
2007 /* Allocate some memory to hold information read in from the input
2009 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
2010 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
2011 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
2012 bfd_malloc (max_internal_reloc_count
2013 * sizeof (Elf_Internal_Rela
)));
2014 finfo
.external_syms
= ((Elf_External_Sym
*)
2015 bfd_malloc (max_sym_count
2016 * sizeof (Elf_External_Sym
)));
2017 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
2018 bfd_malloc (max_sym_count
2019 * sizeof (Elf_Internal_Sym
)));
2020 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
2021 finfo
.sections
= ((asection
**)
2022 bfd_malloc (max_sym_count
* sizeof (asection
*)));
2023 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
2024 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
2025 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
2026 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
2027 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
2028 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
2029 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
2032 /* Since ELF permits relocations to be against local symbols, we
2033 must have the local symbols available when we do the relocations.
2034 Since we would rather only read the local symbols once, and we
2035 would rather not keep them in memory, we handle all the
2036 relocations for a single input file at the same time.
2038 Unfortunately, there is no way to know the total number of local
2039 symbols until we have seen all of them, and the local symbol
2040 indices precede the global symbol indices. This means that when
2041 we are generating relocateable output, and we see a reloc against
2042 a global symbol, we can not know the symbol index until we have
2043 finished examining all the local symbols to see which ones we are
2044 going to output. To deal with this, we keep the relocations in
2045 memory, and don't output them until the end of the link. This is
2046 an unfortunate waste of memory, but I don't see a good way around
2047 it. Fortunately, it only happens when performing a relocateable
2048 link, which is not the common case. FIXME: If keep_memory is set
2049 we could write the relocs out and then read them again; I don't
2050 know how bad the memory loss will be. */
2052 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
2053 sub
->output_has_begun
= false;
2054 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2056 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
2058 if (p
->type
== bfd_indirect_link_order
2059 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
2060 == bfd_target_elf_flavour
))
2062 sub
= p
->u
.indirect
.section
->owner
;
2063 if (! sub
->output_has_begun
)
2065 if (! elf_link_input_bfd (&finfo
, sub
))
2067 sub
->output_has_begun
= true;
2070 else if (p
->type
== bfd_section_reloc_link_order
2071 || p
->type
== bfd_symbol_reloc_link_order
)
2073 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
2078 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
2084 /* That wrote out all the local symbols. Finish up the symbol table
2085 with the global symbols. */
2087 /* The sh_info field records the index of the first non local
2089 symtab_hdr
->sh_info
= abfd
->symcount
;
2091 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
2093 /* We get the global symbols from the hash table. */
2096 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
2101 /* Flush all symbols to the file. */
2102 if (! elf_link_flush_output_syms (&finfo
))
2105 /* Now we know the size of the symtab section. */
2106 off
+= symtab_hdr
->sh_size
;
2108 /* Finish up and write out the symbol string table (.strtab)
2110 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
2111 /* sh_name was set in prep_headers. */
2112 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
2113 symstrtab_hdr
->sh_flags
= 0;
2114 symstrtab_hdr
->sh_addr
= 0;
2115 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
2116 symstrtab_hdr
->sh_entsize
= 0;
2117 symstrtab_hdr
->sh_link
= 0;
2118 symstrtab_hdr
->sh_info
= 0;
2119 /* sh_offset is set just below. */
2120 symstrtab_hdr
->sh_addralign
= 1;
2122 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
2123 elf_tdata (abfd
)->next_file_pos
= off
;
2125 if (abfd
->symcount
> 0)
2127 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
2128 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
2132 /* Adjust the relocs to have the correct symbol indices. */
2133 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2135 struct elf_link_hash_entry
**rel_hash
;
2136 Elf_Internal_Shdr
*rel_hdr
;
2138 if ((o
->flags
& SEC_RELOC
) == 0)
2141 rel_hash
= elf_section_data (o
)->rel_hashes
;
2142 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2143 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
2145 if (*rel_hash
== NULL
)
2148 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
2150 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2152 Elf_External_Rel
*erel
;
2153 Elf_Internal_Rel irel
;
2155 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
2156 elf_swap_reloc_in (abfd
, erel
, &irel
);
2157 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2158 ELF_R_TYPE (irel
.r_info
));
2159 elf_swap_reloc_out (abfd
, &irel
, erel
);
2163 Elf_External_Rela
*erela
;
2164 Elf_Internal_Rela irela
;
2166 BFD_ASSERT (rel_hdr
->sh_entsize
2167 == sizeof (Elf_External_Rela
));
2169 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
2170 elf_swap_reloca_in (abfd
, erela
, &irela
);
2171 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2172 ELF_R_TYPE (irela
.r_info
));
2173 elf_swap_reloca_out (abfd
, &irela
, erela
);
2177 /* Set the reloc_count field to 0 to prevent write_relocs from
2178 trying to swap the relocs out itself. */
2182 /* If we are linking against a dynamic object, or generating a
2183 shared library, finish up the dynamic linking information. */
2186 Elf_External_Dyn
*dyncon
, *dynconend
;
2188 /* Fix up .dynamic entries. */
2189 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
2190 BFD_ASSERT (o
!= NULL
);
2192 dyncon
= (Elf_External_Dyn
*) o
->contents
;
2193 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
2194 for (; dyncon
< dynconend
; dyncon
++)
2196 Elf_Internal_Dyn dyn
;
2200 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2207 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
2208 magic _init and _fini symbols. This is pretty ugly,
2209 but we are compatible. */
2217 struct elf_link_hash_entry
*h
;
2219 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
2220 false, false, true);
2222 && (h
->root
.type
== bfd_link_hash_defined
2223 || h
->root
.type
== bfd_link_hash_defweak
))
2225 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
2226 o
= h
->root
.u
.def
.section
;
2227 if (o
->output_section
!= NULL
)
2228 dyn
.d_un
.d_val
+= (o
->output_section
->vma
2229 + o
->output_offset
);
2232 /* The symbol is imported from another shared
2233 library and does not apply to this one. */
2237 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2251 o
= bfd_get_section_by_name (abfd
, name
);
2252 BFD_ASSERT (o
!= NULL
);
2253 dyn
.d_un
.d_ptr
= o
->vma
;
2254 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2261 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
2266 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
2268 Elf_Internal_Shdr
*hdr
;
2270 hdr
= elf_elfsections (abfd
)[i
];
2271 if (hdr
->sh_type
== type
2272 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
2274 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
2275 dyn
.d_un
.d_val
+= hdr
->sh_size
;
2278 if (dyn
.d_un
.d_val
== 0
2279 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
2280 dyn
.d_un
.d_val
= hdr
->sh_addr
;
2284 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2290 /* If we have created any dynamic sections, then output them. */
2293 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
2296 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
2298 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
2299 || o
->_raw_size
== 0)
2301 if ((o
->flags
& SEC_IN_MEMORY
) == 0)
2303 /* At this point, we are only interested in sections
2304 created by elf_link_create_dynamic_sections. FIXME:
2305 This test is fragile. */
2308 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
2310 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
2312 if (! bfd_set_section_contents (abfd
, o
->output_section
,
2313 o
->contents
, o
->output_offset
,
2321 /* The contents of the .dynstr section are actually in a
2323 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
2324 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
2325 || ! _bfd_stringtab_emit (abfd
,
2326 elf_hash_table (info
)->dynstr
))
2332 if (finfo
.symstrtab
!= NULL
)
2333 _bfd_stringtab_free (finfo
.symstrtab
);
2334 if (finfo
.contents
!= NULL
)
2335 free (finfo
.contents
);
2336 if (finfo
.external_relocs
!= NULL
)
2337 free (finfo
.external_relocs
);
2338 if (finfo
.internal_relocs
!= NULL
)
2339 free (finfo
.internal_relocs
);
2340 if (finfo
.external_syms
!= NULL
)
2341 free (finfo
.external_syms
);
2342 if (finfo
.internal_syms
!= NULL
)
2343 free (finfo
.internal_syms
);
2344 if (finfo
.indices
!= NULL
)
2345 free (finfo
.indices
);
2346 if (finfo
.sections
!= NULL
)
2347 free (finfo
.sections
);
2348 if (finfo
.symbuf
!= NULL
)
2349 free (finfo
.symbuf
);
2350 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2352 if ((o
->flags
& SEC_RELOC
) != 0
2353 && elf_section_data (o
)->rel_hashes
!= NULL
)
2354 free (elf_section_data (o
)->rel_hashes
);
2357 elf_tdata (abfd
)->linker
= true;
2362 if (finfo
.symstrtab
!= NULL
)
2363 _bfd_stringtab_free (finfo
.symstrtab
);
2364 if (finfo
.contents
!= NULL
)
2365 free (finfo
.contents
);
2366 if (finfo
.external_relocs
!= NULL
)
2367 free (finfo
.external_relocs
);
2368 if (finfo
.internal_relocs
!= NULL
)
2369 free (finfo
.internal_relocs
);
2370 if (finfo
.external_syms
!= NULL
)
2371 free (finfo
.external_syms
);
2372 if (finfo
.internal_syms
!= NULL
)
2373 free (finfo
.internal_syms
);
2374 if (finfo
.indices
!= NULL
)
2375 free (finfo
.indices
);
2376 if (finfo
.sections
!= NULL
)
2377 free (finfo
.sections
);
2378 if (finfo
.symbuf
!= NULL
)
2379 free (finfo
.symbuf
);
2380 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2382 if ((o
->flags
& SEC_RELOC
) != 0
2383 && elf_section_data (o
)->rel_hashes
!= NULL
)
2384 free (elf_section_data (o
)->rel_hashes
);
2390 /* Add a symbol to the output symbol table. */
2393 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
2394 struct elf_final_link_info
*finfo
;
2396 Elf_Internal_Sym
*elfsym
;
2397 asection
*input_sec
;
2399 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
2400 struct bfd_link_info
*info
,
2405 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
2406 elf_backend_link_output_symbol_hook
;
2407 if (output_symbol_hook
!= NULL
)
2409 if (! ((*output_symbol_hook
)
2410 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
2414 if (name
== (const char *) NULL
|| *name
== '\0')
2415 elfsym
->st_name
= 0;
2418 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
2421 if (elfsym
->st_name
== (unsigned long) -1)
2425 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
2427 if (! elf_link_flush_output_syms (finfo
))
2431 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
2432 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
2433 ++finfo
->symbuf_count
;
2435 ++finfo
->output_bfd
->symcount
;
2440 /* Flush the output symbols to the file. */
2443 elf_link_flush_output_syms (finfo
)
2444 struct elf_final_link_info
*finfo
;
2446 if (finfo
->symbuf_count
> 0)
2448 Elf_Internal_Shdr
*symtab
;
2450 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
2452 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
2454 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
2455 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
2456 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
2459 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
2461 finfo
->symbuf_count
= 0;
2467 /* Add an external symbol to the symbol table. This is called from
2468 the hash table traversal routine. */
2471 elf_link_output_extsym (h
, data
)
2472 struct elf_link_hash_entry
*h
;
2475 struct elf_finfo_failed
*eif
= (struct elf_finfo_failed
*) data
;
2476 struct elf_final_link_info
*finfo
= eif
->finfo
;
2478 Elf_Internal_Sym sym
;
2479 asection
*input_sec
;
2481 /* If we are not creating a shared library, and this symbol is
2482 referenced by a shared library but is not defined anywhere, then
2483 warn that it is undefined. If we do not do this, the runtime
2484 linker will complain that the symbol is undefined when the
2485 program is run. We don't have to worry about symbols that are
2486 referenced by regular files, because we will already have issued
2487 warnings for them. */
2488 if (! finfo
->info
->relocateable
2489 && ! finfo
->info
->shared
2490 && h
->root
.type
== bfd_link_hash_undefined
2491 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
2492 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2494 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
2495 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
2496 (asection
*) NULL
, 0)))
2503 /* We don't want to output symbols that have never been mentioned by
2504 a regular file, or that we have been told to strip. However, if
2505 h->indx is set to -2, the symbol is used by a reloc and we must
2509 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2510 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2511 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2512 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2514 else if (finfo
->info
->strip
== strip_all
2515 || (finfo
->info
->strip
== strip_some
2516 && bfd_hash_lookup (finfo
->info
->keep_hash
,
2517 h
->root
.root
.string
,
2518 false, false) == NULL
))
2523 /* If we're stripping it, and it's not a dynamic symbol, there's
2524 nothing else to do. */
2525 if (strip
&& h
->dynindx
== -1)
2529 sym
.st_size
= h
->size
;
2531 if (h
->root
.type
== bfd_link_hash_undefweak
2532 || h
->root
.type
== bfd_link_hash_defweak
)
2533 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
2535 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
2537 switch (h
->root
.type
)
2540 case bfd_link_hash_new
:
2544 case bfd_link_hash_undefined
:
2545 input_sec
= bfd_und_section_ptr
;
2546 sym
.st_shndx
= SHN_UNDEF
;
2549 case bfd_link_hash_undefweak
:
2550 input_sec
= bfd_und_section_ptr
;
2551 sym
.st_shndx
= SHN_UNDEF
;
2554 case bfd_link_hash_defined
:
2555 case bfd_link_hash_defweak
:
2557 input_sec
= h
->root
.u
.def
.section
;
2558 if (input_sec
->output_section
!= NULL
)
2561 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
2562 input_sec
->output_section
);
2563 if (sym
.st_shndx
== (unsigned short) -1)
2569 /* ELF symbols in relocateable files are section relative,
2570 but in nonrelocateable files they are virtual
2572 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
2573 if (! finfo
->info
->relocateable
)
2574 sym
.st_value
+= input_sec
->output_section
->vma
;
2578 BFD_ASSERT ((bfd_get_flavour (input_sec
->owner
)
2579 == bfd_target_elf_flavour
)
2580 && elf_elfheader (input_sec
->owner
)->e_type
== ET_DYN
);
2581 sym
.st_shndx
= SHN_UNDEF
;
2582 input_sec
= bfd_und_section_ptr
;
2587 case bfd_link_hash_common
:
2588 input_sec
= bfd_com_section_ptr
;
2589 sym
.st_shndx
= SHN_COMMON
;
2590 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
2593 case bfd_link_hash_indirect
:
2594 case bfd_link_hash_warning
:
2595 /* We can't represent these symbols in ELF. A warning symbol
2596 may have come from a .gnu.warning.SYMBOL section anyhow. We
2597 just put the target symbol in the hash table. If the target
2598 symbol does not really exist, don't do anything. */
2599 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
2601 return (elf_link_output_extsym
2602 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
2605 /* If this symbol should be put in the .dynsym section, then put it
2606 there now. We have already know the symbol index. We also fill
2607 in the entry in the .hash section. */
2608 if (h
->dynindx
!= -1
2609 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
2611 struct elf_backend_data
*bed
;
2614 bfd_byte
*bucketpos
;
2617 sym
.st_name
= h
->dynstr_index
;
2619 /* Give the processor backend a chance to tweak the symbol
2620 value, and also to finish up anything that needs to be done
2622 bed
= get_elf_backend_data (finfo
->output_bfd
);
2623 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
2624 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
2630 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
2631 (PTR
) (((Elf_External_Sym
*)
2632 finfo
->dynsym_sec
->contents
)
2635 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
2636 bucket
= (bfd_elf_hash ((const unsigned char *) h
->root
.root
.string
)
2638 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
2639 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
2640 chain
= get_word (finfo
->output_bfd
, bucketpos
);
2641 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
2642 put_word (finfo
->output_bfd
, chain
,
2643 ((bfd_byte
*) finfo
->hash_sec
->contents
2644 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
2647 /* If we're stripping it, then it was just a dynamic symbol, and
2648 there's nothing else to do. */
2652 h
->indx
= finfo
->output_bfd
->symcount
;
2654 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
2663 /* Link an input file into the linker output file. This function
2664 handles all the sections and relocations of the input file at once.
2665 This is so that we only have to read the local symbols once, and
2666 don't have to keep them in memory. */
2669 elf_link_input_bfd (finfo
, input_bfd
)
2670 struct elf_final_link_info
*finfo
;
2673 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
2674 bfd
*, asection
*, bfd_byte
*,
2675 Elf_Internal_Rela
*,
2676 Elf_Internal_Sym
*, asection
**));
2678 Elf_Internal_Shdr
*symtab_hdr
;
2681 Elf_External_Sym
*esym
;
2682 Elf_External_Sym
*esymend
;
2683 Elf_Internal_Sym
*isym
;
2685 asection
**ppsection
;
2688 output_bfd
= finfo
->output_bfd
;
2690 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
2692 /* If this is a dynamic object, we don't want to do anything here:
2693 we don't want the local symbols, and we don't want the section
2695 if (elf_elfheader (input_bfd
)->e_type
== ET_DYN
)
2698 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2699 if (elf_bad_symtab (input_bfd
))
2701 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
2706 locsymcount
= symtab_hdr
->sh_info
;
2707 extsymoff
= symtab_hdr
->sh_info
;
2710 /* Read the local symbols. */
2712 && (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
2713 || (bfd_read (finfo
->external_syms
, sizeof (Elf_External_Sym
),
2714 locsymcount
, input_bfd
)
2715 != locsymcount
* sizeof (Elf_External_Sym
))))
2718 /* Swap in the local symbols and write out the ones which we know
2719 are going into the output file. */
2720 esym
= finfo
->external_syms
;
2721 esymend
= esym
+ locsymcount
;
2722 isym
= finfo
->internal_syms
;
2723 pindex
= finfo
->indices
;
2724 ppsection
= finfo
->sections
;
2725 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
2729 Elf_Internal_Sym osym
;
2731 elf_swap_symbol_in (input_bfd
, esym
, isym
);
2734 if (elf_bad_symtab (input_bfd
))
2736 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
2743 if (isym
->st_shndx
== SHN_UNDEF
)
2744 isec
= bfd_und_section_ptr
;
2745 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
2746 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
2747 else if (isym
->st_shndx
== SHN_ABS
)
2748 isec
= bfd_abs_section_ptr
;
2749 else if (isym
->st_shndx
== SHN_COMMON
)
2750 isec
= bfd_com_section_ptr
;
2759 /* Don't output the first, undefined, symbol. */
2760 if (esym
== finfo
->external_syms
)
2763 /* If we are stripping all symbols, we don't want to output this
2765 if (finfo
->info
->strip
== strip_all
)
2768 /* We never output section symbols. Instead, we use the section
2769 symbol of the corresponding section in the output file. */
2770 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
2773 /* If we are discarding all local symbols, we don't want to
2774 output this one. If we are generating a relocateable output
2775 file, then some of the local symbols may be required by
2776 relocs; we output them below as we discover that they are
2778 if (finfo
->info
->discard
== discard_all
)
2781 /* Get the name of the symbol. */
2782 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
2787 /* See if we are discarding symbols with this name. */
2788 if ((finfo
->info
->strip
== strip_some
2789 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
2791 || (finfo
->info
->discard
== discard_l
2792 && strncmp (name
, finfo
->info
->lprefix
,
2793 finfo
->info
->lprefix_len
) == 0))
2796 /* If we get here, we are going to output this symbol. */
2800 /* Adjust the section index for the output file. */
2801 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
2802 isec
->output_section
);
2803 if (osym
.st_shndx
== (unsigned short) -1)
2806 *pindex
= output_bfd
->symcount
;
2808 /* ELF symbols in relocateable files are section relative, but
2809 in executable files they are virtual addresses. Note that
2810 this code assumes that all ELF sections have an associated
2811 BFD section with a reasonable value for output_offset; below
2812 we assume that they also have a reasonable value for
2813 output_section. Any special sections must be set up to meet
2814 these requirements. */
2815 osym
.st_value
+= isec
->output_offset
;
2816 if (! finfo
->info
->relocateable
)
2817 osym
.st_value
+= isec
->output_section
->vma
;
2819 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
2823 /* Relocate the contents of each section. */
2824 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
2826 if (! o
->linker_mark
)
2828 /* This section was omitted from the link. */
2832 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0)
2835 if ((o
->flags
& SEC_IN_MEMORY
) != 0
2836 && input_bfd
== elf_hash_table (finfo
->info
)->dynobj
)
2838 /* Section was created by elf_link_create_dynamic_sections.
2839 FIXME: This test is fragile. */
2843 /* Read the contents of the section. */
2844 if (! bfd_get_section_contents (input_bfd
, o
, finfo
->contents
,
2845 (file_ptr
) 0, o
->_raw_size
))
2848 if ((o
->flags
& SEC_RELOC
) != 0)
2850 Elf_Internal_Rela
*internal_relocs
;
2852 /* Get the swapped relocs. */
2853 internal_relocs
= elf_link_read_relocs (input_bfd
, o
,
2854 finfo
->external_relocs
,
2855 finfo
->internal_relocs
,
2857 if (internal_relocs
== NULL
2858 && o
->reloc_count
> 0)
2861 /* Relocate the section by invoking a back end routine.
2863 The back end routine is responsible for adjusting the
2864 section contents as necessary, and (if using Rela relocs
2865 and generating a relocateable output file) adjusting the
2866 reloc addend as necessary.
2868 The back end routine does not have to worry about setting
2869 the reloc address or the reloc symbol index.
2871 The back end routine is given a pointer to the swapped in
2872 internal symbols, and can access the hash table entries
2873 for the external symbols via elf_sym_hashes (input_bfd).
2875 When generating relocateable output, the back end routine
2876 must handle STB_LOCAL/STT_SECTION symbols specially. The
2877 output symbol is going to be a section symbol
2878 corresponding to the output section, which will require
2879 the addend to be adjusted. */
2881 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
2885 finfo
->internal_syms
,
2889 if (finfo
->info
->relocateable
)
2891 Elf_Internal_Rela
*irela
;
2892 Elf_Internal_Rela
*irelaend
;
2893 struct elf_link_hash_entry
**rel_hash
;
2894 Elf_Internal_Shdr
*input_rel_hdr
;
2895 Elf_Internal_Shdr
*output_rel_hdr
;
2897 /* Adjust the reloc addresses and symbol indices. */
2899 irela
= internal_relocs
;
2900 irelaend
= irela
+ o
->reloc_count
;
2901 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
2902 + o
->output_section
->reloc_count
);
2903 for (; irela
< irelaend
; irela
++, rel_hash
++)
2905 unsigned long r_symndx
;
2906 Elf_Internal_Sym
*isym
;
2909 irela
->r_offset
+= o
->output_offset
;
2911 r_symndx
= ELF_R_SYM (irela
->r_info
);
2916 if (r_symndx
>= locsymcount
2917 || (elf_bad_symtab (input_bfd
)
2918 && finfo
->sections
[r_symndx
] == NULL
))
2922 /* This is a reloc against a global symbol. We
2923 have not yet output all the local symbols, so
2924 we do not know the symbol index of any global
2925 symbol. We set the rel_hash entry for this
2926 reloc to point to the global hash table entry
2927 for this symbol. The symbol index is then
2928 set at the end of elf_bfd_final_link. */
2929 indx
= r_symndx
- extsymoff
;
2930 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
2932 /* Setting the index to -2 tells
2933 elf_link_output_extsym that this symbol is
2935 BFD_ASSERT ((*rel_hash
)->indx
< 0);
2936 (*rel_hash
)->indx
= -2;
2941 /* This is a reloc against a local symbol. */
2944 isym
= finfo
->internal_syms
+ r_symndx
;
2945 sec
= finfo
->sections
[r_symndx
];
2946 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
2948 /* I suppose the backend ought to fill in the
2949 section of any STT_SECTION symbol against a
2950 processor specific section. */
2951 if (sec
!= NULL
&& bfd_is_abs_section (sec
))
2953 else if (sec
== NULL
|| sec
->owner
== NULL
)
2955 bfd_set_error (bfd_error_bad_value
);
2960 r_symndx
= sec
->output_section
->target_index
;
2961 BFD_ASSERT (r_symndx
!= 0);
2966 if (finfo
->indices
[r_symndx
] == -1)
2972 if (finfo
->info
->strip
== strip_all
)
2974 /* You can't do ld -r -s. */
2975 bfd_set_error (bfd_error_invalid_operation
);
2979 /* This symbol was skipped earlier, but
2980 since it is needed by a reloc, we
2981 must output it now. */
2982 link
= symtab_hdr
->sh_link
;
2983 name
= bfd_elf_string_from_elf_section (input_bfd
,
2989 osec
= sec
->output_section
;
2991 _bfd_elf_section_from_bfd_section (output_bfd
,
2993 if (isym
->st_shndx
== (unsigned short) -1)
2996 isym
->st_value
+= sec
->output_offset
;
2997 if (! finfo
->info
->relocateable
)
2998 isym
->st_value
+= osec
->vma
;
3000 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
3002 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
3006 r_symndx
= finfo
->indices
[r_symndx
];
3009 irela
->r_info
= ELF_R_INFO (r_symndx
,
3010 ELF_R_TYPE (irela
->r_info
));
3013 /* Swap out the relocs. */
3014 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3015 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
3016 BFD_ASSERT (output_rel_hdr
->sh_entsize
3017 == input_rel_hdr
->sh_entsize
);
3018 irela
= internal_relocs
;
3019 irelaend
= irela
+ o
->reloc_count
;
3020 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3022 Elf_External_Rel
*erel
;
3024 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
3025 + o
->output_section
->reloc_count
);
3026 for (; irela
< irelaend
; irela
++, erel
++)
3028 Elf_Internal_Rel irel
;
3030 irel
.r_offset
= irela
->r_offset
;
3031 irel
.r_info
= irela
->r_info
;
3032 BFD_ASSERT (irela
->r_addend
== 0);
3033 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3038 Elf_External_Rela
*erela
;
3040 BFD_ASSERT (input_rel_hdr
->sh_entsize
3041 == sizeof (Elf_External_Rela
));
3042 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
3043 + o
->output_section
->reloc_count
);
3044 for (; irela
< irelaend
; irela
++, erela
++)
3045 elf_swap_reloca_out (output_bfd
, irela
, erela
);
3048 o
->output_section
->reloc_count
+= o
->reloc_count
;
3052 /* Write out the modified section contents. */
3053 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
3054 finfo
->contents
, o
->output_offset
,
3055 (o
->_cooked_size
!= 0
3064 /* Generate a reloc when linking an ELF file. This is a reloc
3065 requested by the linker, and does come from any input file. This
3066 is used to build constructor and destructor tables when linking
3070 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
3072 struct bfd_link_info
*info
;
3073 asection
*output_section
;
3074 struct bfd_link_order
*link_order
;
3076 reloc_howto_type
*howto
;
3080 struct elf_link_hash_entry
**rel_hash_ptr
;
3081 Elf_Internal_Shdr
*rel_hdr
;
3083 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
3086 bfd_set_error (bfd_error_bad_value
);
3090 addend
= link_order
->u
.reloc
.p
->addend
;
3092 /* Figure out the symbol index. */
3093 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
3094 + output_section
->reloc_count
);
3095 if (link_order
->type
== bfd_section_reloc_link_order
)
3097 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
3098 BFD_ASSERT (indx
!= 0);
3099 *rel_hash_ptr
= NULL
;
3103 struct elf_link_hash_entry
*h
;
3105 /* Treat a reloc against a defined symbol as though it were
3106 actually against the section. */
3107 h
= ((struct elf_link_hash_entry
*)
3108 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
3109 link_order
->u
.reloc
.p
->u
.name
,
3110 false, false, true));
3112 && (h
->root
.type
== bfd_link_hash_defined
3113 || h
->root
.type
== bfd_link_hash_defweak
))
3117 section
= h
->root
.u
.def
.section
;
3118 indx
= section
->output_section
->target_index
;
3119 *rel_hash_ptr
= NULL
;
3120 /* It seems that we ought to add the symbol value to the
3121 addend here, but in practice it has already been added
3122 because it was passed to constructor_callback. */
3123 addend
+= section
->output_section
->vma
+ section
->output_offset
;
3127 /* Setting the index to -2 tells elf_link_output_extsym that
3128 this symbol is used by a reloc. */
3135 if (! ((*info
->callbacks
->unattached_reloc
)
3136 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
3137 (asection
*) NULL
, (bfd_vma
) 0)))
3143 /* If this is an inplace reloc, we must write the addend into the
3145 if (howto
->partial_inplace
&& addend
!= 0)
3148 bfd_reloc_status_type rstat
;
3152 size
= bfd_get_reloc_size (howto
);
3153 buf
= (bfd_byte
*) bfd_zmalloc (size
);
3154 if (buf
== (bfd_byte
*) NULL
)
3156 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
3162 case bfd_reloc_outofrange
:
3164 case bfd_reloc_overflow
:
3165 if (! ((*info
->callbacks
->reloc_overflow
)
3167 (link_order
->type
== bfd_section_reloc_link_order
3168 ? bfd_section_name (output_bfd
,
3169 link_order
->u
.reloc
.p
->u
.section
)
3170 : link_order
->u
.reloc
.p
->u
.name
),
3171 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
3179 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
3180 (file_ptr
) link_order
->offset
, size
);
3186 /* The address of a reloc is relative to the section in a
3187 relocateable file, and is a virtual address in an executable
3189 offset
= link_order
->offset
;
3190 if (! info
->relocateable
)
3191 offset
+= output_section
->vma
;
3193 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
3195 if (rel_hdr
->sh_type
== SHT_REL
)
3197 Elf_Internal_Rel irel
;
3198 Elf_External_Rel
*erel
;
3200 irel
.r_offset
= offset
;
3201 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3202 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
3203 + output_section
->reloc_count
);
3204 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3208 Elf_Internal_Rela irela
;
3209 Elf_External_Rela
*erela
;
3211 irela
.r_offset
= offset
;
3212 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3213 irela
.r_addend
= addend
;
3214 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
3215 + output_section
->reloc_count
);
3216 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
3219 ++output_section
->reloc_count
;
3225 /* Allocate a pointer to live in a linker created section. */
3228 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
3230 struct bfd_link_info
*info
;
3231 elf_linker_section_t
*lsect
;
3232 struct elf_link_hash_entry
*h
;
3233 const Elf_Internal_Rela
*rel
;
3235 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
3236 elf_linker_section_pointers_t
*linker_section_ptr
;
3237 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
3239 BFD_ASSERT (lsect
!= NULL
);
3241 /* Is this a global symbol? */
3244 /* Has this symbol already been allocated, if so, our work is done */
3245 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3250 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
3251 /* Make sure this symbol is output as a dynamic symbol. */
3252 if (h
->dynindx
== -1)
3254 if (! elf_link_record_dynamic_symbol (info
, h
))
3258 if (lsect
->rel_section
)
3259 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3262 else /* Allocation of a pointer to a local symbol */
3264 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
3266 /* Allocate a table to hold the local symbols if first time */
3269 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
3270 register unsigned int i
;
3272 ptr
= (elf_linker_section_pointers_t
**)
3273 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
3278 elf_local_ptr_offsets (abfd
) = ptr
;
3279 for (i
= 0; i
< num_symbols
; i
++)
3280 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
3283 /* Has this symbol already been allocated, if so, our work is done */
3284 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
3289 ptr_linker_section_ptr
= &ptr
[r_symndx
];
3293 /* If we are generating a shared object, we need to
3294 output a R_<xxx>_RELATIVE reloc so that the
3295 dynamic linker can adjust this GOT entry. */
3296 BFD_ASSERT (lsect
->rel_section
!= NULL
);
3297 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3301 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
3302 from internal memory. */
3303 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
3304 linker_section_ptr
= (elf_linker_section_pointers_t
*)
3305 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
3307 if (!linker_section_ptr
)
3310 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
3311 linker_section_ptr
->addend
= rel
->r_addend
;
3312 linker_section_ptr
->which
= lsect
->which
;
3313 linker_section_ptr
->written_address_p
= false;
3314 *ptr_linker_section_ptr
= linker_section_ptr
;
3316 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
3318 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
;
3319 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
3320 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
3321 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
3322 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
3325 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
3327 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
3330 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
3331 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
3339 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
3342 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
3345 /* Fill in the address for a pointer generated in alinker section. */
3348 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
3351 struct bfd_link_info
*info
;
3352 elf_linker_section_t
*lsect
;
3353 struct elf_link_hash_entry
*h
;
3355 const Elf_Internal_Rela
*rel
;
3358 elf_linker_section_pointers_t
*linker_section_ptr
;
3360 BFD_ASSERT (lsect
!= NULL
);
3362 if (h
!= NULL
) /* global symbol */
3364 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3368 BFD_ASSERT (linker_section_ptr
!= NULL
);
3370 if (! elf_hash_table (info
)->dynamic_sections_created
3373 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
3375 /* This is actually a static link, or it is a
3376 -Bsymbolic link and the symbol is defined
3377 locally. We must initialize this entry in the
3380 When doing a dynamic link, we create a .rela.<xxx>
3381 relocation entry to initialize the value. This
3382 is done in the finish_dynamic_symbol routine. */
3383 if (!linker_section_ptr
->written_address_p
)
3385 linker_section_ptr
->written_address_p
= true;
3386 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3387 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3391 else /* local symbol */
3393 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
3394 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
3395 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
3396 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
3400 BFD_ASSERT (linker_section_ptr
!= NULL
);
3402 /* Write out pointer if it hasn't been rewritten out before */
3403 if (!linker_section_ptr
->written_address_p
)
3405 linker_section_ptr
->written_address_p
= true;
3406 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3407 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3411 asection
*srel
= lsect
->rel_section
;
3412 Elf_Internal_Rela outrel
;
3414 /* We need to generate a relative reloc for the dynamic linker. */
3416 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
3419 BFD_ASSERT (srel
!= NULL
);
3421 outrel
.r_offset
= (lsect
->section
->output_section
->vma
3422 + lsect
->section
->output_offset
3423 + linker_section_ptr
->offset
);
3424 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
3425 outrel
.r_addend
= 0;
3426 elf_swap_reloca_out (output_bfd
, &outrel
,
3427 (((Elf_External_Rela
*)
3428 lsect
->section
->contents
)
3429 + lsect
->section
->reloc_count
));
3430 ++lsect
->section
->reloc_count
;
3435 relocation
= (lsect
->section
->output_offset
3436 + linker_section_ptr
->offset
3437 - lsect
->hole_offset
3438 - lsect
->sym_offset
);
3441 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
3442 lsect
->name
, (long)relocation
, (long)relocation
);
3445 /* Subtract out the addend, because it will get added back in by the normal
3447 return relocation
- linker_section_ptr
->addend
;