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 boolean elf_export_symbol
27 PARAMS ((struct elf_link_hash_entry
*, PTR
));
28 static boolean elf_adjust_dynamic_symbol
29 PARAMS ((struct elf_link_hash_entry
*, PTR
));
31 /* This struct is used to pass information to routines called via
32 elf_link_hash_traverse which must return failure. */
34 struct elf_info_failed
37 struct bfd_link_info
*info
;
40 /* Given an ELF BFD, add symbols to the global hash table as
44 elf_bfd_link_add_symbols (abfd
, info
)
46 struct bfd_link_info
*info
;
48 switch (bfd_get_format (abfd
))
51 return elf_link_add_object_symbols (abfd
, info
);
53 return elf_link_add_archive_symbols (abfd
, info
);
55 bfd_set_error (bfd_error_wrong_format
);
61 /* Add symbols from an ELF archive file to the linker hash table. We
62 don't use _bfd_generic_link_add_archive_symbols because of a
63 problem which arises on UnixWare. The UnixWare libc.so is an
64 archive which includes an entry libc.so.1 which defines a bunch of
65 symbols. The libc.so archive also includes a number of other
66 object files, which also define symbols, some of which are the same
67 as those defined in libc.so.1. Correct linking requires that we
68 consider each object file in turn, and include it if it defines any
69 symbols we need. _bfd_generic_link_add_archive_symbols does not do
70 this; it looks through the list of undefined symbols, and includes
71 any object file which defines them. When this algorithm is used on
72 UnixWare, it winds up pulling in libc.so.1 early and defining a
73 bunch of symbols. This means that some of the other objects in the
74 archive are not included in the link, which is incorrect since they
75 precede libc.so.1 in the archive.
77 Fortunately, ELF archive handling is simpler than that done by
78 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
79 oddities. In ELF, if we find a symbol in the archive map, and the
80 symbol is currently undefined, we know that we must pull in that
83 Unfortunately, we do have to make multiple passes over the symbol
84 table until nothing further is resolved. */
87 elf_link_add_archive_symbols (abfd
, info
)
89 struct bfd_link_info
*info
;
92 boolean
*defined
= NULL
;
93 boolean
*included
= NULL
;
97 if (! bfd_has_map (abfd
))
99 /* An empty archive is a special case. */
100 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
102 bfd_set_error (bfd_error_no_armap
);
106 /* Keep track of all symbols we know to be already defined, and all
107 files we know to be already included. This is to speed up the
108 second and subsequent passes. */
109 c
= bfd_ardata (abfd
)->symdef_count
;
112 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
113 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
114 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
116 memset (defined
, 0, c
* sizeof (boolean
));
117 memset (included
, 0, c
* sizeof (boolean
));
119 symdefs
= bfd_ardata (abfd
)->symdefs
;
132 symdefend
= symdef
+ c
;
133 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
135 struct elf_link_hash_entry
*h
;
137 struct bfd_link_hash_entry
*undefs_tail
;
140 if (defined
[i
] || included
[i
])
142 if (symdef
->file_offset
== last
)
148 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
149 false, false, false);
150 if (h
== (struct elf_link_hash_entry
*) NULL
)
152 if (h
->root
.type
!= bfd_link_hash_undefined
)
154 if (h
->root
.type
!= bfd_link_hash_undefweak
)
159 /* We need to include this archive member. */
161 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
162 if (element
== (bfd
*) NULL
)
165 if (! bfd_check_format (element
, bfd_object
))
168 /* Doublecheck that we have not included this object
169 already--it should be impossible, but there may be
170 something wrong with the archive. */
171 if (element
->archive_pass
!= 0)
173 bfd_set_error (bfd_error_bad_value
);
176 element
->archive_pass
= 1;
178 undefs_tail
= info
->hash
->undefs_tail
;
180 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
183 if (! elf_link_add_object_symbols (element
, info
))
186 /* If there are any new undefined symbols, we need to make
187 another pass through the archive in order to see whether
188 they can be defined. FIXME: This isn't perfect, because
189 common symbols wind up on undefs_tail and because an
190 undefined symbol which is defined later on in this pass
191 does not require another pass. This isn't a bug, but it
192 does make the code less efficient than it could be. */
193 if (undefs_tail
!= info
->hash
->undefs_tail
)
196 /* Look backward to mark all symbols from this object file
197 which we have already seen in this pass. */
201 included
[mark
] = true;
206 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
208 /* We mark subsequent symbols from this object file as we go
209 on through the loop. */
210 last
= symdef
->file_offset
;
221 if (defined
!= (boolean
*) NULL
)
223 if (included
!= (boolean
*) NULL
)
228 /* Add symbols from an ELF object file to the linker hash table. */
231 elf_link_add_object_symbols (abfd
, info
)
233 struct bfd_link_info
*info
;
235 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
236 const Elf_Internal_Sym
*,
237 const char **, flagword
*,
238 asection
**, bfd_vma
*));
239 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
240 asection
*, const Elf_Internal_Rela
*));
242 Elf_Internal_Shdr
*hdr
;
246 Elf_External_Sym
*buf
= NULL
;
247 struct elf_link_hash_entry
**sym_hash
;
249 Elf_External_Dyn
*dynbuf
= NULL
;
250 struct elf_link_hash_entry
*weaks
;
251 Elf_External_Sym
*esym
;
252 Elf_External_Sym
*esymend
;
254 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
255 collect
= get_elf_backend_data (abfd
)->collect
;
257 /* As a GNU extension, any input sections which are named
258 .gnu.warning.SYMBOL are treated as warning symbols for the given
259 symbol. This differs from .gnu.warning sections, which generate
260 warnings when they are included in an output file. */
265 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
269 name
= bfd_get_section_name (abfd
, s
);
270 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
275 sz
= bfd_section_size (abfd
, s
);
276 msg
= (char *) bfd_alloc (abfd
, sz
);
280 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
283 if (! (_bfd_generic_link_add_one_symbol
285 name
+ sizeof ".gnu.warning." - 1,
286 BSF_WARNING
, s
, (bfd_vma
) 0, msg
, false, collect
,
287 (struct bfd_link_hash_entry
**) NULL
)))
290 if (! info
->relocateable
)
292 /* Clobber the section size so that the warning does
293 not get copied into the output file. */
300 /* A stripped shared library might only have a dynamic symbol table,
301 not a regular symbol table. In that case we can still go ahead
302 and link using the dynamic symbol table. */
303 if (elf_onesymtab (abfd
) == 0
304 && elf_dynsymtab (abfd
) != 0)
306 elf_onesymtab (abfd
) = elf_dynsymtab (abfd
);
307 elf_tdata (abfd
)->symtab_hdr
= elf_tdata (abfd
)->dynsymtab_hdr
;
310 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
311 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
313 /* The sh_info field of the symtab header tells us where the
314 external symbols start. We don't care about the local symbols at
316 if (elf_bad_symtab (abfd
))
318 extsymcount
= symcount
;
323 extsymcount
= symcount
- hdr
->sh_info
;
324 extsymoff
= hdr
->sh_info
;
327 buf
= ((Elf_External_Sym
*)
328 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
329 if (buf
== NULL
&& extsymcount
!= 0)
332 /* We store a pointer to the hash table entry for each external
334 sym_hash
= ((struct elf_link_hash_entry
**)
336 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
337 if (sym_hash
== NULL
)
339 elf_sym_hashes (abfd
) = sym_hash
;
341 if (elf_elfheader (abfd
)->e_type
!= ET_DYN
)
345 /* If we are creating a shared library, create all the dynamic
346 sections immediately. We need to attach them to something,
347 so we attach them to this BFD, provided it is the right
348 format. FIXME: If there are no input BFD's of the same
349 format as the output, we can't make a shared library. */
351 && ! elf_hash_table (info
)->dynamic_sections_created
352 && abfd
->xvec
== info
->hash
->creator
)
354 if (! elf_link_create_dynamic_sections (abfd
, info
))
363 bfd_size_type oldsize
;
364 bfd_size_type strindex
;
368 /* You can't use -r against a dynamic object. Also, there's no
369 hope of using a dynamic object which does not exactly match
370 the format of the output file. */
371 if (info
->relocateable
372 || info
->hash
->creator
!= abfd
->xvec
)
374 bfd_set_error (bfd_error_invalid_operation
);
378 /* Find the name to use in a DT_NEEDED entry that refers to this
379 object. If the object has a DT_SONAME entry, we use it.
380 Otherwise, if the generic linker stuck something in
381 elf_dt_name, we use that. Otherwise, we just use the file
382 name. If the generic linker put a null string into
383 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
384 there is a DT_SONAME entry. */
386 name
= bfd_get_filename (abfd
);
387 if (elf_dt_name (abfd
) != NULL
)
389 name
= elf_dt_name (abfd
);
393 s
= bfd_get_section_by_name (abfd
, ".dynamic");
396 Elf_External_Dyn
*extdyn
;
397 Elf_External_Dyn
*extdynend
;
401 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
405 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
406 (file_ptr
) 0, s
->_raw_size
))
409 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
412 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
415 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
416 for (; extdyn
< extdynend
; extdyn
++)
418 Elf_Internal_Dyn dyn
;
420 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
421 if (dyn
.d_tag
== DT_SONAME
)
423 name
= bfd_elf_string_from_elf_section (abfd
, link
,
428 if (dyn
.d_tag
== DT_NEEDED
)
430 struct bfd_link_needed_list
*n
, **pn
;
433 n
= ((struct bfd_link_needed_list
*)
434 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
435 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
437 if (n
== NULL
|| fnm
== NULL
)
439 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
446 for (pn
= &elf_hash_table (info
)->needed
;
458 /* We do not want to include any of the sections in a dynamic
459 object in the output file. We hack by simply clobbering the
460 list of sections in the BFD. This could be handled more
461 cleanly by, say, a new section flag; the existing
462 SEC_NEVER_LOAD flag is not the one we want, because that one
463 still implies that the section takes up space in the output
465 abfd
->sections
= NULL
;
466 abfd
->section_count
= 0;
468 /* If this is the first dynamic object found in the link, create
469 the special sections required for dynamic linking. */
470 if (! elf_hash_table (info
)->dynamic_sections_created
)
472 if (! elf_link_create_dynamic_sections (abfd
, info
))
478 /* Add a DT_NEEDED entry for this dynamic object. */
479 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
480 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
482 if (strindex
== (bfd_size_type
) -1)
485 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
488 Elf_External_Dyn
*dyncon
, *dynconend
;
490 /* The hash table size did not change, which means that
491 the dynamic object name was already entered. If we
492 have already included this dynamic object in the
493 link, just ignore it. There is no reason to include
494 a particular dynamic object more than once. */
495 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
497 BFD_ASSERT (sdyn
!= NULL
);
499 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
500 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
502 for (; dyncon
< dynconend
; dyncon
++)
504 Elf_Internal_Dyn dyn
;
506 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
508 if (dyn
.d_tag
== DT_NEEDED
509 && dyn
.d_un
.d_val
== strindex
)
518 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
522 /* Save the SONAME, if there is one, because sometimes the
523 linker emulation code will need to know it. */
525 name
= bfd_get_filename (abfd
);
526 elf_dt_name (abfd
) = name
;
530 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
532 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
533 != extsymcount
* sizeof (Elf_External_Sym
)))
538 esymend
= buf
+ extsymcount
;
539 for (esym
= buf
; esym
< esymend
; esym
++, sym_hash
++)
541 Elf_Internal_Sym sym
;
547 struct elf_link_hash_entry
*h
;
549 boolean size_change_ok
, type_change_ok
;
552 elf_swap_symbol_in (abfd
, esym
, &sym
);
554 flags
= BSF_NO_FLAGS
;
556 value
= sym
.st_value
;
559 bind
= ELF_ST_BIND (sym
.st_info
);
560 if (bind
== STB_LOCAL
)
562 /* This should be impossible, since ELF requires that all
563 global symbols follow all local symbols, and that sh_info
564 point to the first global symbol. Unfortunatealy, Irix 5
568 else if (bind
== STB_GLOBAL
)
570 if (sym
.st_shndx
!= SHN_UNDEF
571 && sym
.st_shndx
!= SHN_COMMON
)
576 else if (bind
== STB_WEAK
)
580 /* Leave it up to the processor backend. */
583 if (sym
.st_shndx
== SHN_UNDEF
)
584 sec
= bfd_und_section_ptr
;
585 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
587 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
591 sec
= bfd_abs_section_ptr
;
593 else if (sym
.st_shndx
== SHN_ABS
)
594 sec
= bfd_abs_section_ptr
;
595 else if (sym
.st_shndx
== SHN_COMMON
)
597 sec
= bfd_com_section_ptr
;
598 /* What ELF calls the size we call the value. What ELF
599 calls the value we call the alignment. */
604 /* Leave it up to the processor backend. */
607 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
608 if (name
== (const char *) NULL
)
613 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
617 /* The hook function sets the name to NULL if this symbol
618 should be skipped for some reason. */
619 if (name
== (const char *) NULL
)
623 /* Sanity check that all possibilities were handled. */
624 if (sec
== (asection
*) NULL
)
626 bfd_set_error (bfd_error_bad_value
);
630 if (bfd_is_und_section (sec
)
631 || bfd_is_com_section (sec
))
636 size_change_ok
= false;
637 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
638 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
640 /* We need to look up the symbol now in order to get some of
641 the dynamic object handling right. We pass the hash
642 table entry in to _bfd_generic_link_add_one_symbol so
643 that it does not have to look it up again. */
644 if (! bfd_is_und_section (sec
))
645 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
648 h
= ((struct elf_link_hash_entry
*)
649 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true,
655 if (h
->root
.type
== bfd_link_hash_new
)
656 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
658 while (h
->root
.type
== bfd_link_hash_indirect
659 || h
->root
.type
== bfd_link_hash_warning
)
660 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
662 /* It's OK to change the type if it used to be a weak
664 if (h
->root
.type
== bfd_link_hash_defweak
665 || h
->root
.type
== bfd_link_hash_undefweak
)
666 type_change_ok
= true;
668 /* It's OK to change the size if it used to be a weak
669 definition, or if it used to be undefined, or if we will
670 be overriding an old definition. */
672 || h
->root
.type
== bfd_link_hash_undefined
)
673 size_change_ok
= true;
675 /* If we are looking at a dynamic object, and this is a
676 definition, we need to see if it has already been defined
677 by some other object. If it has, we want to use the
678 existing definition, and we do not want to report a
679 multiple symbol definition error; we do this by
680 clobbering sec to be bfd_und_section_ptr. We treat a
681 common symbol as a definition if the symbol in the shared
682 library is a function, since common symbols always
683 represent variables; this can cause confusion in
684 principle, but any such confusion would seem to indicate
685 an erroneous program or shared library. */
686 if (dynamic
&& definition
)
688 if (h
->root
.type
== bfd_link_hash_defined
689 || h
->root
.type
== bfd_link_hash_defweak
690 || (h
->root
.type
== bfd_link_hash_common
692 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
)))
694 sec
= bfd_und_section_ptr
;
696 size_change_ok
= true;
697 if (h
->root
.type
== bfd_link_hash_common
)
698 type_change_ok
= true;
702 /* Similarly, if we are not looking at a dynamic object, and
703 we have a definition, we want to override any definition
704 we may have from a dynamic object. Symbols from regular
705 files always take precedence over symbols from dynamic
706 objects, even if they are defined after the dynamic
707 object in the link. */
710 || (bfd_is_com_section (sec
)
711 && (h
->root
.type
== bfd_link_hash_defweak
712 || h
->type
== STT_FUNC
)))
713 && (h
->root
.type
== bfd_link_hash_defined
714 || h
->root
.type
== bfd_link_hash_defweak
)
715 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
716 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
717 == bfd_target_elf_flavour
)
718 && (elf_elfheader (h
->root
.u
.def
.section
->owner
)->e_type
721 /* Change the hash table entry to undefined, and let
722 _bfd_generic_link_add_one_symbol do the right thing
723 with the new definition. */
724 h
->root
.type
= bfd_link_hash_undefined
;
725 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
726 size_change_ok
= true;
727 if (bfd_is_com_section (sec
))
728 type_change_ok
= true;
732 if (! (_bfd_generic_link_add_one_symbol
733 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
734 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
738 while (h
->root
.type
== bfd_link_hash_indirect
739 || h
->root
.type
== bfd_link_hash_warning
)
740 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
746 && (flags
& BSF_WEAK
) != 0
747 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
748 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
749 && h
->weakdef
== NULL
)
751 /* Keep a list of all weak defined non function symbols from
752 a dynamic object, using the weakdef field. Later in this
753 function we will set the weakdef field to the correct
754 value. We only put non-function symbols from dynamic
755 objects on this list, because that happens to be the only
756 time we need to know the normal symbol corresponding to a
757 weak symbol, and the information is time consuming to
758 figure out. If the weakdef field is not already NULL,
759 then this symbol was already defined by some previous
760 dynamic object, and we will be using that previous
761 definition anyhow. */
768 /* Get the alignment of a common symbol. */
769 if (sym
.st_shndx
== SHN_COMMON
770 && h
->root
.type
== bfd_link_hash_common
)
771 h
->root
.u
.c
.p
->alignment_power
= bfd_log2 (sym
.st_value
);
773 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
779 /* Remember the symbol size and type. */
781 && (definition
|| h
->size
== 0))
783 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
784 (*_bfd_error_handler
)
785 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
786 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
787 bfd_get_filename (abfd
));
789 h
->size
= sym
.st_size
;
791 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
792 && (definition
|| h
->type
== STT_NOTYPE
))
794 if (h
->type
!= STT_NOTYPE
795 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
797 (*_bfd_error_handler
)
798 ("Warning: type of symbol `%s' changed from %d to %d in %s",
799 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
800 bfd_get_filename (abfd
));
802 h
->type
= ELF_ST_TYPE (sym
.st_info
);
805 /* Set a flag in the hash table entry indicating the type of
806 reference or definition we just found. Keep a count of
807 the number of dynamic symbols we find. A dynamic symbol
808 is one which is referenced or defined by both a regular
809 object and a shared object, or one which is referenced or
810 defined by more than one shared object. */
811 old_flags
= h
->elf_link_hash_flags
;
816 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
818 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
820 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
821 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
827 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
829 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
830 if ((old_flags
& new_flag
) != 0
831 || (old_flags
& (ELF_LINK_HASH_DEF_REGULAR
832 | ELF_LINK_HASH_REF_REGULAR
)) != 0
833 || (h
->weakdef
!= NULL
834 && (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
835 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0))
839 h
->elf_link_hash_flags
|= new_flag
;
840 if (dynsym
&& h
->dynindx
== -1)
842 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
844 if (h
->weakdef
!= NULL
846 && h
->weakdef
->dynindx
== -1)
848 if (! _bfd_elf_link_record_dynamic_symbol (info
,
856 /* Now set the weakdefs field correctly for all the weak defined
857 symbols we found. The only way to do this is to search all the
858 symbols. Since we only need the information for non functions in
859 dynamic objects, that's the only time we actually put anything on
860 the list WEAKS. We need this information so that if a regular
861 object refers to a symbol defined weakly in a dynamic object, the
862 real symbol in the dynamic object is also put in the dynamic
863 symbols; we also must arrange for both symbols to point to the
864 same memory location. We could handle the general case of symbol
865 aliasing, but a general symbol alias can only be generated in
866 assembler code, handling it correctly would be very time
867 consuming, and other ELF linkers don't handle general aliasing
869 while (weaks
!= NULL
)
871 struct elf_link_hash_entry
*hlook
;
874 struct elf_link_hash_entry
**hpp
;
875 struct elf_link_hash_entry
**hppend
;
878 weaks
= hlook
->weakdef
;
879 hlook
->weakdef
= NULL
;
881 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
882 || hlook
->root
.type
== bfd_link_hash_defweak
883 || hlook
->root
.type
== bfd_link_hash_common
884 || hlook
->root
.type
== bfd_link_hash_indirect
);
885 slook
= hlook
->root
.u
.def
.section
;
886 vlook
= hlook
->root
.u
.def
.value
;
888 hpp
= elf_sym_hashes (abfd
);
889 hppend
= hpp
+ extsymcount
;
890 for (; hpp
< hppend
; hpp
++)
892 struct elf_link_hash_entry
*h
;
895 if (h
!= NULL
&& h
!= hlook
896 && h
->root
.type
== bfd_link_hash_defined
897 && h
->root
.u
.def
.section
== slook
898 && h
->root
.u
.def
.value
== vlook
)
902 /* If the weak definition is in the list of dynamic
903 symbols, make sure the real definition is put there
905 if (hlook
->dynindx
!= -1
908 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
923 /* If this object is the same format as the output object, and it is
924 not a shared library, then let the backend look through the
927 This is required to build global offset table entries and to
928 arrange for dynamic relocs. It is not required for the
929 particular common case of linking non PIC code, even when linking
930 against shared libraries, but unfortunately there is no way of
931 knowing whether an object file has been compiled PIC or not.
932 Looking through the relocs is not particularly time consuming.
933 The problem is that we must either (1) keep the relocs in memory,
934 which causes the linker to require additional runtime memory or
935 (2) read the relocs twice from the input file, which wastes time.
936 This would be a good case for using mmap.
938 I have no idea how to handle linking PIC code into a file of a
939 different format. It probably can't be done. */
940 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
942 && abfd
->xvec
== info
->hash
->creator
943 && check_relocs
!= NULL
)
947 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
949 Elf_Internal_Rela
*internal_relocs
;
952 if ((o
->flags
& SEC_RELOC
) == 0
953 || o
->reloc_count
== 0)
956 /* I believe we can ignore the relocs for any section which
957 does not form part of the final process image, such as a
958 debugging section. */
959 if ((o
->flags
& SEC_ALLOC
) == 0)
962 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
963 (abfd
, o
, (PTR
) NULL
,
964 (Elf_Internal_Rela
*) NULL
,
966 if (internal_relocs
== NULL
)
969 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
971 if (! info
->keep_memory
)
972 free (internal_relocs
);
979 /* If this is a non-traditional, non-relocateable link, try to
980 optimize the handling of the .stab/.stabstr sections. */
982 && ! info
->relocateable
983 && ! info
->traditional_format
984 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
985 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
987 asection
*stab
, *stabstr
;
989 stab
= bfd_get_section_by_name (abfd
, ".stab");
992 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
996 struct bfd_elf_section_data
*secdata
;
998 secdata
= elf_section_data (stab
);
999 if (! _bfd_link_section_stabs (abfd
,
1000 &elf_hash_table (info
)->stab_info
,
1002 &secdata
->stab_info
))
1018 /* Create some sections which will be filled in with dynamic linking
1019 information. ABFD is an input file which requires dynamic sections
1020 to be created. The dynamic sections take up virtual memory space
1021 when the final executable is run, so we need to create them before
1022 addresses are assigned to the output sections. We work out the
1023 actual contents and size of these sections later. */
1026 elf_link_create_dynamic_sections (abfd
, info
)
1028 struct bfd_link_info
*info
;
1031 register asection
*s
;
1032 struct elf_link_hash_entry
*h
;
1033 struct elf_backend_data
*bed
;
1035 if (elf_hash_table (info
)->dynamic_sections_created
)
1038 /* Make sure that all dynamic sections use the same input BFD. */
1039 if (elf_hash_table (info
)->dynobj
== NULL
)
1040 elf_hash_table (info
)->dynobj
= abfd
;
1042 abfd
= elf_hash_table (info
)->dynobj
;
1044 /* Note that we set the SEC_IN_MEMORY flag for all of these
1046 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
;
1048 /* A dynamically linked executable has a .interp section, but a
1049 shared library does not. */
1052 s
= bfd_make_section (abfd
, ".interp");
1054 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1058 s
= bfd_make_section (abfd
, ".dynsym");
1060 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1061 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1064 s
= bfd_make_section (abfd
, ".dynstr");
1066 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1069 /* Create a strtab to hold the dynamic symbol names. */
1070 if (elf_hash_table (info
)->dynstr
== NULL
)
1072 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1073 if (elf_hash_table (info
)->dynstr
== NULL
)
1077 s
= bfd_make_section (abfd
, ".dynamic");
1079 || ! bfd_set_section_flags (abfd
, s
, flags
)
1080 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1083 /* The special symbol _DYNAMIC is always set to the start of the
1084 .dynamic section. This call occurs before we have processed the
1085 symbols for any dynamic object, so we don't have to worry about
1086 overriding a dynamic definition. We could set _DYNAMIC in a
1087 linker script, but we only want to define it if we are, in fact,
1088 creating a .dynamic section. We don't want to define it if there
1089 is no .dynamic section, since on some ELF platforms the start up
1090 code examines it to decide how to initialize the process. */
1092 if (! (_bfd_generic_link_add_one_symbol
1093 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1094 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1095 (struct bfd_link_hash_entry
**) &h
)))
1097 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1098 h
->type
= STT_OBJECT
;
1101 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1104 s
= bfd_make_section (abfd
, ".hash");
1106 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1107 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1110 /* Let the backend create the rest of the sections. This lets the
1111 backend set the right flags. The backend will normally create
1112 the .got and .plt sections. */
1113 bed
= get_elf_backend_data (abfd
);
1114 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1117 elf_hash_table (info
)->dynamic_sections_created
= true;
1122 /* Add an entry to the .dynamic table. */
1125 elf_add_dynamic_entry (info
, tag
, val
)
1126 struct bfd_link_info
*info
;
1130 Elf_Internal_Dyn dyn
;
1134 bfd_byte
*newcontents
;
1136 dynobj
= elf_hash_table (info
)->dynobj
;
1138 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1139 BFD_ASSERT (s
!= NULL
);
1141 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1142 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1143 if (newcontents
== NULL
)
1147 dyn
.d_un
.d_val
= val
;
1148 elf_swap_dyn_out (dynobj
, &dyn
,
1149 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1151 s
->_raw_size
= newsize
;
1152 s
->contents
= newcontents
;
1158 /* Read and swap the relocs for a section. They may have been cached.
1159 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1160 they are used as buffers to read into. They are known to be large
1161 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1162 value is allocated using either malloc or bfd_alloc, according to
1163 the KEEP_MEMORY argument. */
1166 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1170 PTR external_relocs
;
1171 Elf_Internal_Rela
*internal_relocs
;
1172 boolean keep_memory
;
1174 Elf_Internal_Shdr
*rel_hdr
;
1176 Elf_Internal_Rela
*alloc2
= NULL
;
1178 if (elf_section_data (o
)->relocs
!= NULL
)
1179 return elf_section_data (o
)->relocs
;
1181 if (o
->reloc_count
== 0)
1184 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1186 if (internal_relocs
== NULL
)
1190 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1192 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1194 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1195 if (internal_relocs
== NULL
)
1199 if (external_relocs
== NULL
)
1201 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1204 external_relocs
= alloc1
;
1207 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1208 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1209 != rel_hdr
->sh_size
))
1212 /* Swap in the relocs. For convenience, we always produce an
1213 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1215 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1217 Elf_External_Rel
*erel
;
1218 Elf_External_Rel
*erelend
;
1219 Elf_Internal_Rela
*irela
;
1221 erel
= (Elf_External_Rel
*) external_relocs
;
1222 erelend
= erel
+ o
->reloc_count
;
1223 irela
= internal_relocs
;
1224 for (; erel
< erelend
; erel
++, irela
++)
1226 Elf_Internal_Rel irel
;
1228 elf_swap_reloc_in (abfd
, erel
, &irel
);
1229 irela
->r_offset
= irel
.r_offset
;
1230 irela
->r_info
= irel
.r_info
;
1231 irela
->r_addend
= 0;
1236 Elf_External_Rela
*erela
;
1237 Elf_External_Rela
*erelaend
;
1238 Elf_Internal_Rela
*irela
;
1240 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1242 erela
= (Elf_External_Rela
*) external_relocs
;
1243 erelaend
= erela
+ o
->reloc_count
;
1244 irela
= internal_relocs
;
1245 for (; erela
< erelaend
; erela
++, irela
++)
1246 elf_swap_reloca_in (abfd
, erela
, irela
);
1249 /* Cache the results for next time, if we can. */
1251 elf_section_data (o
)->relocs
= internal_relocs
;
1256 /* Don't free alloc2, since if it was allocated we are passing it
1257 back (under the name of internal_relocs). */
1259 return internal_relocs
;
1270 /* Record an assignment to a symbol made by a linker script. We need
1271 this in case some dynamic object refers to this symbol. */
1275 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1277 struct bfd_link_info
*info
;
1281 struct elf_link_hash_entry
*h
;
1283 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1286 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1290 if (h
->root
.type
== bfd_link_hash_new
)
1291 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
1293 /* If this symbol is being provided by the linker script, and it is
1294 currently defined by a dynamic object, but not by a regular
1295 object, then mark it as undefined so that the generic linker will
1296 force the correct value. */
1298 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1299 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1300 h
->root
.type
= bfd_link_hash_undefined
;
1302 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1303 h
->type
= STT_OBJECT
;
1305 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1306 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1308 && h
->dynindx
== -1)
1310 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1313 /* If this is a weak defined symbol, and we know a corresponding
1314 real symbol from the same dynamic object, make sure the real
1315 symbol is also made into a dynamic symbol. */
1316 if (h
->weakdef
!= NULL
1317 && h
->weakdef
->dynindx
== -1)
1319 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1328 /* Array used to determine the number of hash table buckets to use
1329 based on the number of symbols there are. If there are fewer than
1330 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1331 fewer than 37 we use 17 buckets, and so forth. We never use more
1332 than 521 buckets. */
1334 static const size_t elf_buckets
[] =
1336 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 0
1339 /* Set up the sizes and contents of the ELF dynamic sections. This is
1340 called by the ELF linker emulation before_allocation routine. We
1341 must set the sizes of the sections before the linker sets the
1342 addresses of the various sections. */
1345 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
1346 export_dynamic
, info
, sinterpptr
)
1350 boolean export_dynamic
;
1351 struct bfd_link_info
*info
;
1352 asection
**sinterpptr
;
1355 struct elf_backend_data
*bed
;
1359 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1362 dynobj
= elf_hash_table (info
)->dynobj
;
1364 /* If there were no dynamic objects in the link, there is nothing to
1369 /* If we are supposed to export all symbols into the dynamic symbol
1370 table (this is not the normal case), then do so. */
1373 struct elf_info_failed eif
;
1377 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
1383 if (elf_hash_table (info
)->dynamic_sections_created
)
1385 struct elf_info_failed eif
;
1386 struct elf_link_hash_entry
*h
;
1387 bfd_size_type strsize
;
1389 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
1390 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
1396 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, soname
,
1398 if (indx
== (bfd_size_type
) -1
1399 || ! elf_add_dynamic_entry (info
, DT_SONAME
, indx
))
1405 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
1413 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
1415 if (indx
== (bfd_size_type
) -1
1416 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
1420 /* Find all symbols which were defined in a dynamic object and make
1421 the backend pick a reasonable value for them. */
1424 elf_link_hash_traverse (elf_hash_table (info
),
1425 elf_adjust_dynamic_symbol
,
1430 /* Add some entries to the .dynamic section. We fill in some of the
1431 values later, in elf_bfd_final_link, but we must add the entries
1432 now so that we know the final size of the .dynamic section. */
1433 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
1436 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1437 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1439 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
1442 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
1445 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
1446 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
1448 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
1451 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1452 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
1453 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
1454 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
1455 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
1456 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
1457 sizeof (Elf_External_Sym
)))
1461 /* The backend must work out the sizes of all the other dynamic
1463 bed
= get_elf_backend_data (output_bfd
);
1464 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
1467 if (elf_hash_table (info
)->dynamic_sections_created
)
1472 size_t bucketcount
= 0;
1473 Elf_Internal_Sym isym
;
1475 /* Set the size of the .dynsym and .hash sections. We counted
1476 the number of dynamic symbols in elf_link_add_object_symbols.
1477 We will build the contents of .dynsym and .hash when we build
1478 the final symbol table, because until then we do not know the
1479 correct value to give the symbols. We built the .dynstr
1480 section as we went along in elf_link_add_object_symbols. */
1481 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
1482 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
1483 BFD_ASSERT (s
!= NULL
);
1484 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
1485 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1486 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
1489 /* The first entry in .dynsym is a dummy symbol. */
1496 elf_swap_symbol_out (output_bfd
, &isym
,
1497 (PTR
) (Elf_External_Sym
*) s
->contents
);
1499 for (i
= 0; elf_buckets
[i
] != 0; i
++)
1501 bucketcount
= elf_buckets
[i
];
1502 if (dynsymcount
< elf_buckets
[i
+ 1])
1506 s
= bfd_get_section_by_name (dynobj
, ".hash");
1507 BFD_ASSERT (s
!= NULL
);
1508 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
1509 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
1510 if (s
->contents
== NULL
)
1512 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
1514 put_word (output_bfd
, bucketcount
, s
->contents
);
1515 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
1517 elf_hash_table (info
)->bucketcount
= bucketcount
;
1519 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
1520 BFD_ASSERT (s
!= NULL
);
1521 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1523 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
1531 /* This routine is used to export all defined symbols into the dynamic
1532 symbol table. It is called via elf_link_hash_traverse. */
1535 elf_export_symbol (h
, data
)
1536 struct elf_link_hash_entry
*h
;
1539 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1541 if (h
->dynindx
== -1
1542 && (h
->elf_link_hash_flags
1543 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
1545 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1556 /* Make the backend pick a good value for a dynamic symbol. This is
1557 called via elf_link_hash_traverse, and also calls itself
1561 elf_adjust_dynamic_symbol (h
, data
)
1562 struct elf_link_hash_entry
*h
;
1565 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1567 struct elf_backend_data
*bed
;
1569 /* If this symbol was mentioned in a non-ELF file, try to set
1570 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
1571 permit a non-ELF file to correctly refer to a symbol defined in
1572 an ELF dynamic object. */
1573 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
1575 if (h
->root
.type
!= bfd_link_hash_defined
1576 && h
->root
.type
!= bfd_link_hash_defweak
)
1577 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1580 if (h
->root
.u
.def
.section
->owner
!= NULL
1581 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
1582 == bfd_target_elf_flavour
))
1583 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1585 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1588 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1589 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
1591 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1599 /* If this is a final link, and the symbol was defined as a common
1600 symbol in a regular object file, and there was no definition in
1601 any dynamic object, then the linker will have allocated space for
1602 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
1603 flag will not have been set. */
1604 if (h
->root
.type
== bfd_link_hash_defined
1605 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
1606 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
1607 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1608 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
1609 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1611 /* If -Bsymbolic was used (which means to bind references to global
1612 symbols to the definition within the shared object), and this
1613 symbol was defined in a regular object, then it actually doesn't
1614 need a PLT entry. */
1615 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
1616 && eif
->info
->shared
1617 && eif
->info
->symbolic
1618 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1619 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
1621 /* If this symbol does not require a PLT entry, and it is not
1622 defined by a dynamic object, or is not referenced by a regular
1623 object, ignore it. We do have to handle a weak defined symbol,
1624 even if no regular object refers to it, if we decided to add it
1625 to the dynamic symbol table. FIXME: Do we normally need to worry
1626 about symbols which are defined by one dynamic object and
1627 referenced by another one? */
1628 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
1629 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
1630 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
1631 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
1632 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
1635 /* If we've already adjusted this symbol, don't do it again. This
1636 can happen via a recursive call. */
1637 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
1640 /* Don't look at this symbol again. Note that we must set this
1641 after checking the above conditions, because we may look at a
1642 symbol once, decide not to do anything, and then get called
1643 recursively later after REF_REGULAR is set below. */
1644 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
1646 /* If this is a weak definition, and we know a real definition, and
1647 the real symbol is not itself defined by a regular object file,
1648 then get a good value for the real definition. We handle the
1649 real symbol first, for the convenience of the backend routine.
1651 Note that there is a confusing case here. If the real definition
1652 is defined by a regular object file, we don't get the real symbol
1653 from the dynamic object, but we do get the weak symbol. If the
1654 processor backend uses a COPY reloc, then if some routine in the
1655 dynamic object changes the real symbol, we will not see that
1656 change in the corresponding weak symbol. This is the way other
1657 ELF linkers work as well, and seems to be a result of the shared
1660 I will clarify this issue. Most SVR4 shared libraries define the
1661 variable _timezone and define timezone as a weak synonym. The
1662 tzset call changes _timezone. If you write
1663 extern int timezone;
1665 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
1666 you might expect that, since timezone is a synonym for _timezone,
1667 the same number will print both times. However, if the processor
1668 backend uses a COPY reloc, then actually timezone will be copied
1669 into your process image, and, since you define _timezone
1670 yourself, _timezone will not. Thus timezone and _timezone will
1671 wind up at different memory locations. The tzset call will set
1672 _timezone, leaving timezone unchanged. */
1674 if (h
->weakdef
!= NULL
)
1676 struct elf_link_hash_entry
*weakdef
;
1678 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
1679 || h
->root
.type
== bfd_link_hash_defweak
);
1680 weakdef
= h
->weakdef
;
1681 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
1682 || weakdef
->root
.type
== bfd_link_hash_defweak
);
1683 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
1684 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
1686 /* This symbol is defined by a regular object file, so we
1687 will not do anything special. Clear weakdef for the
1688 convenience of the processor backend. */
1693 /* There is an implicit reference by a regular object file
1694 via the weak symbol. */
1695 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
1696 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
1701 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
1702 bed
= get_elf_backend_data (dynobj
);
1703 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
1712 /* Final phase of ELF linker. */
1714 /* A structure we use to avoid passing large numbers of arguments. */
1716 struct elf_final_link_info
1718 /* General link information. */
1719 struct bfd_link_info
*info
;
1722 /* Symbol string table. */
1723 struct bfd_strtab_hash
*symstrtab
;
1724 /* .dynsym section. */
1725 asection
*dynsym_sec
;
1726 /* .hash section. */
1728 /* Buffer large enough to hold contents of any section. */
1730 /* Buffer large enough to hold external relocs of any section. */
1731 PTR external_relocs
;
1732 /* Buffer large enough to hold internal relocs of any section. */
1733 Elf_Internal_Rela
*internal_relocs
;
1734 /* Buffer large enough to hold external local symbols of any input
1736 Elf_External_Sym
*external_syms
;
1737 /* Buffer large enough to hold internal local symbols of any input
1739 Elf_Internal_Sym
*internal_syms
;
1740 /* Array large enough to hold a symbol index for each local symbol
1741 of any input BFD. */
1743 /* Array large enough to hold a section pointer for each local
1744 symbol of any input BFD. */
1745 asection
**sections
;
1746 /* Buffer to hold swapped out symbols. */
1747 Elf_External_Sym
*symbuf
;
1748 /* Number of swapped out symbols in buffer. */
1749 size_t symbuf_count
;
1750 /* Number of symbols which fit in symbuf. */
1754 static boolean elf_link_output_sym
1755 PARAMS ((struct elf_final_link_info
*, const char *,
1756 Elf_Internal_Sym
*, asection
*));
1757 static boolean elf_link_flush_output_syms
1758 PARAMS ((struct elf_final_link_info
*));
1759 static boolean elf_link_output_extsym
1760 PARAMS ((struct elf_link_hash_entry
*, PTR
));
1761 static boolean elf_link_input_bfd
1762 PARAMS ((struct elf_final_link_info
*, bfd
*));
1763 static boolean elf_reloc_link_order
1764 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
1765 struct bfd_link_order
*));
1767 /* This struct is used to pass information to routines called via
1768 elf_link_hash_traverse which must return failure. */
1770 struct elf_finfo_failed
1773 struct elf_final_link_info
*finfo
;
1776 /* Do the final step of an ELF link. */
1779 elf_bfd_final_link (abfd
, info
)
1781 struct bfd_link_info
*info
;
1785 struct elf_final_link_info finfo
;
1786 register asection
*o
;
1787 register struct bfd_link_order
*p
;
1789 size_t max_contents_size
;
1790 size_t max_external_reloc_size
;
1791 size_t max_internal_reloc_count
;
1792 size_t max_sym_count
;
1794 Elf_Internal_Sym elfsym
;
1796 Elf_Internal_Shdr
*symtab_hdr
;
1797 Elf_Internal_Shdr
*symstrtab_hdr
;
1798 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1799 struct elf_finfo_failed eif
;
1802 abfd
->flags
|= DYNAMIC
;
1804 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
1805 dynobj
= elf_hash_table (info
)->dynobj
;
1808 finfo
.output_bfd
= abfd
;
1809 finfo
.symstrtab
= elf_stringtab_init ();
1810 if (finfo
.symstrtab
== NULL
)
1814 finfo
.dynsym_sec
= NULL
;
1815 finfo
.hash_sec
= NULL
;
1819 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
1820 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
1821 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
1823 finfo
.contents
= NULL
;
1824 finfo
.external_relocs
= NULL
;
1825 finfo
.internal_relocs
= NULL
;
1826 finfo
.external_syms
= NULL
;
1827 finfo
.internal_syms
= NULL
;
1828 finfo
.indices
= NULL
;
1829 finfo
.sections
= NULL
;
1830 finfo
.symbuf
= NULL
;
1831 finfo
.symbuf_count
= 0;
1833 /* Count up the number of relocations we will output for each output
1834 section, so that we know the sizes of the reloc sections. We
1835 also figure out some maximum sizes. */
1836 max_contents_size
= 0;
1837 max_external_reloc_size
= 0;
1838 max_internal_reloc_count
= 0;
1840 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
1844 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
1846 if (p
->type
== bfd_section_reloc_link_order
1847 || p
->type
== bfd_symbol_reloc_link_order
)
1849 else if (p
->type
== bfd_indirect_link_order
)
1853 sec
= p
->u
.indirect
.section
;
1855 /* Mark all sections which are to be included in the
1856 link. This will normally be every section. We need
1857 to do this so that we can identify any sections which
1858 the linker has decided to not include. */
1859 sec
->linker_mark
= true;
1861 if (info
->relocateable
)
1862 o
->reloc_count
+= sec
->reloc_count
;
1864 if (sec
->_raw_size
> max_contents_size
)
1865 max_contents_size
= sec
->_raw_size
;
1866 if (sec
->_cooked_size
> max_contents_size
)
1867 max_contents_size
= sec
->_cooked_size
;
1869 /* We are interested in just local symbols, not all
1871 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
)
1875 if (elf_bad_symtab (sec
->owner
))
1876 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
1877 / sizeof (Elf_External_Sym
));
1879 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
1881 if (sym_count
> max_sym_count
)
1882 max_sym_count
= sym_count
;
1884 if ((sec
->flags
& SEC_RELOC
) != 0)
1888 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
1889 if (ext_size
> max_external_reloc_size
)
1890 max_external_reloc_size
= ext_size
;
1891 if (sec
->reloc_count
> max_internal_reloc_count
)
1892 max_internal_reloc_count
= sec
->reloc_count
;
1898 if (o
->reloc_count
> 0)
1899 o
->flags
|= SEC_RELOC
;
1902 /* Explicitly clear the SEC_RELOC flag. The linker tends to
1903 set it (this is probably a bug) and if it is set
1904 assign_section_numbers will create a reloc section. */
1905 o
->flags
&=~ SEC_RELOC
;
1908 /* If the SEC_ALLOC flag is not set, force the section VMA to
1909 zero. This is done in elf_fake_sections as well, but forcing
1910 the VMA to 0 here will ensure that relocs against these
1911 sections are handled correctly. */
1912 if ((o
->flags
& SEC_ALLOC
) == 0
1913 && ! o
->user_set_vma
)
1917 /* Figure out the file positions for everything but the symbol table
1918 and the relocs. We set symcount to force assign_section_numbers
1919 to create a symbol table. */
1920 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
1921 BFD_ASSERT (! abfd
->output_has_begun
);
1922 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
1925 /* That created the reloc sections. Set their sizes, and assign
1926 them file positions, and allocate some buffers. */
1927 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1929 if ((o
->flags
& SEC_RELOC
) != 0)
1931 Elf_Internal_Shdr
*rel_hdr
;
1932 register struct elf_link_hash_entry
**p
, **pend
;
1934 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1936 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
1938 /* The contents field must last into write_object_contents,
1939 so we allocate it with bfd_alloc rather than malloc. */
1940 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
1941 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
1944 p
= ((struct elf_link_hash_entry
**)
1945 bfd_malloc (o
->reloc_count
1946 * sizeof (struct elf_link_hash_entry
*)));
1947 if (p
== NULL
&& o
->reloc_count
!= 0)
1949 elf_section_data (o
)->rel_hashes
= p
;
1950 pend
= p
+ o
->reloc_count
;
1951 for (; p
< pend
; p
++)
1954 /* Use the reloc_count field as an index when outputting the
1960 _bfd_elf_assign_file_positions_for_relocs (abfd
);
1962 /* We have now assigned file positions for all the sections except
1963 .symtab and .strtab. We start the .symtab section at the current
1964 file position, and write directly to it. We build the .strtab
1965 section in memory. */
1967 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1968 /* sh_name is set in prep_headers. */
1969 symtab_hdr
->sh_type
= SHT_SYMTAB
;
1970 symtab_hdr
->sh_flags
= 0;
1971 symtab_hdr
->sh_addr
= 0;
1972 symtab_hdr
->sh_size
= 0;
1973 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
1974 /* sh_link is set in assign_section_numbers. */
1975 /* sh_info is set below. */
1976 /* sh_offset is set just below. */
1977 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
1979 off
= elf_tdata (abfd
)->next_file_pos
;
1980 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
1982 /* Note that at this point elf_tdata (abfd)->next_file_pos is
1983 incorrect. We do not yet know the size of the .symtab section.
1984 We correct next_file_pos below, after we do know the size. */
1986 /* Allocate a buffer to hold swapped out symbols. This is to avoid
1987 continuously seeking to the right position in the file. */
1988 if (! info
->keep_memory
|| max_sym_count
< 20)
1989 finfo
.symbuf_size
= 20;
1991 finfo
.symbuf_size
= max_sym_count
;
1992 finfo
.symbuf
= ((Elf_External_Sym
*)
1993 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
1994 if (finfo
.symbuf
== NULL
)
1997 /* Start writing out the symbol table. The first symbol is always a
1999 if (info
->strip
!= strip_all
|| info
->relocateable
)
2001 elfsym
.st_value
= 0;
2004 elfsym
.st_other
= 0;
2005 elfsym
.st_shndx
= SHN_UNDEF
;
2006 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
2007 &elfsym
, bfd_und_section_ptr
))
2012 /* Some standard ELF linkers do this, but we don't because it causes
2013 bootstrap comparison failures. */
2014 /* Output a file symbol for the output file as the second symbol.
2015 We output this even if we are discarding local symbols, although
2016 I'm not sure if this is correct. */
2017 elfsym
.st_value
= 0;
2019 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
2020 elfsym
.st_other
= 0;
2021 elfsym
.st_shndx
= SHN_ABS
;
2022 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
2023 &elfsym
, bfd_abs_section_ptr
))
2027 /* Output a symbol for each section. We output these even if we are
2028 discarding local symbols, since they are used for relocs. These
2029 symbols have no names. We store the index of each one in the
2030 index field of the section, so that we can find it again when
2031 outputting relocs. */
2032 if (info
->strip
!= strip_all
|| info
->relocateable
)
2034 elfsym
.st_value
= 0;
2036 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
2037 elfsym
.st_other
= 0;
2038 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
2040 o
= section_from_elf_index (abfd
, i
);
2042 o
->target_index
= abfd
->symcount
;
2043 elfsym
.st_shndx
= i
;
2044 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
2050 /* Allocate some memory to hold information read in from the input
2052 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
2053 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
2054 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
2055 bfd_malloc (max_internal_reloc_count
2056 * sizeof (Elf_Internal_Rela
)));
2057 finfo
.external_syms
= ((Elf_External_Sym
*)
2058 bfd_malloc (max_sym_count
2059 * sizeof (Elf_External_Sym
)));
2060 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
2061 bfd_malloc (max_sym_count
2062 * sizeof (Elf_Internal_Sym
)));
2063 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
2064 finfo
.sections
= ((asection
**)
2065 bfd_malloc (max_sym_count
* sizeof (asection
*)));
2066 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
2067 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
2068 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
2069 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
2070 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
2071 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
2072 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
2075 /* Since ELF permits relocations to be against local symbols, we
2076 must have the local symbols available when we do the relocations.
2077 Since we would rather only read the local symbols once, and we
2078 would rather not keep them in memory, we handle all the
2079 relocations for a single input file at the same time.
2081 Unfortunately, there is no way to know the total number of local
2082 symbols until we have seen all of them, and the local symbol
2083 indices precede the global symbol indices. This means that when
2084 we are generating relocateable output, and we see a reloc against
2085 a global symbol, we can not know the symbol index until we have
2086 finished examining all the local symbols to see which ones we are
2087 going to output. To deal with this, we keep the relocations in
2088 memory, and don't output them until the end of the link. This is
2089 an unfortunate waste of memory, but I don't see a good way around
2090 it. Fortunately, it only happens when performing a relocateable
2091 link, which is not the common case. FIXME: If keep_memory is set
2092 we could write the relocs out and then read them again; I don't
2093 know how bad the memory loss will be. */
2095 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
2096 sub
->output_has_begun
= false;
2097 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2099 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
2101 if (p
->type
== bfd_indirect_link_order
2102 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
2103 == bfd_target_elf_flavour
))
2105 sub
= p
->u
.indirect
.section
->owner
;
2106 if (! sub
->output_has_begun
)
2108 if (! elf_link_input_bfd (&finfo
, sub
))
2110 sub
->output_has_begun
= true;
2113 else if (p
->type
== bfd_section_reloc_link_order
2114 || p
->type
== bfd_symbol_reloc_link_order
)
2116 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
2121 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
2127 /* That wrote out all the local symbols. Finish up the symbol table
2128 with the global symbols. */
2130 /* The sh_info field records the index of the first non local
2132 symtab_hdr
->sh_info
= abfd
->symcount
;
2134 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
2136 /* We get the global symbols from the hash table. */
2139 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
2144 /* Flush all symbols to the file. */
2145 if (! elf_link_flush_output_syms (&finfo
))
2148 /* Now we know the size of the symtab section. */
2149 off
+= symtab_hdr
->sh_size
;
2151 /* Finish up and write out the symbol string table (.strtab)
2153 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
2154 /* sh_name was set in prep_headers. */
2155 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
2156 symstrtab_hdr
->sh_flags
= 0;
2157 symstrtab_hdr
->sh_addr
= 0;
2158 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
2159 symstrtab_hdr
->sh_entsize
= 0;
2160 symstrtab_hdr
->sh_link
= 0;
2161 symstrtab_hdr
->sh_info
= 0;
2162 /* sh_offset is set just below. */
2163 symstrtab_hdr
->sh_addralign
= 1;
2165 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
2166 elf_tdata (abfd
)->next_file_pos
= off
;
2168 if (abfd
->symcount
> 0)
2170 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
2171 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
2175 /* Adjust the relocs to have the correct symbol indices. */
2176 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2178 struct elf_link_hash_entry
**rel_hash
;
2179 Elf_Internal_Shdr
*rel_hdr
;
2181 if ((o
->flags
& SEC_RELOC
) == 0)
2184 rel_hash
= elf_section_data (o
)->rel_hashes
;
2185 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2186 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
2188 if (*rel_hash
== NULL
)
2191 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
2193 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2195 Elf_External_Rel
*erel
;
2196 Elf_Internal_Rel irel
;
2198 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
2199 elf_swap_reloc_in (abfd
, erel
, &irel
);
2200 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2201 ELF_R_TYPE (irel
.r_info
));
2202 elf_swap_reloc_out (abfd
, &irel
, erel
);
2206 Elf_External_Rela
*erela
;
2207 Elf_Internal_Rela irela
;
2209 BFD_ASSERT (rel_hdr
->sh_entsize
2210 == sizeof (Elf_External_Rela
));
2212 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
2213 elf_swap_reloca_in (abfd
, erela
, &irela
);
2214 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
2215 ELF_R_TYPE (irela
.r_info
));
2216 elf_swap_reloca_out (abfd
, &irela
, erela
);
2220 /* Set the reloc_count field to 0 to prevent write_relocs from
2221 trying to swap the relocs out itself. */
2225 /* If we are linking against a dynamic object, or generating a
2226 shared library, finish up the dynamic linking information. */
2229 Elf_External_Dyn
*dyncon
, *dynconend
;
2231 /* Fix up .dynamic entries. */
2232 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
2233 BFD_ASSERT (o
!= NULL
);
2235 dyncon
= (Elf_External_Dyn
*) o
->contents
;
2236 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
2237 for (; dyncon
< dynconend
; dyncon
++)
2239 Elf_Internal_Dyn dyn
;
2243 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2250 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
2251 magic _init and _fini symbols. This is pretty ugly,
2252 but we are compatible. */
2260 struct elf_link_hash_entry
*h
;
2262 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
2263 false, false, true);
2265 && (h
->root
.type
== bfd_link_hash_defined
2266 || h
->root
.type
== bfd_link_hash_defweak
))
2268 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
2269 o
= h
->root
.u
.def
.section
;
2270 if (o
->output_section
!= NULL
)
2271 dyn
.d_un
.d_val
+= (o
->output_section
->vma
2272 + o
->output_offset
);
2275 /* The symbol is imported from another shared
2276 library and does not apply to this one. */
2280 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2294 o
= bfd_get_section_by_name (abfd
, name
);
2295 BFD_ASSERT (o
!= NULL
);
2296 dyn
.d_un
.d_ptr
= o
->vma
;
2297 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2304 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
2309 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
2311 Elf_Internal_Shdr
*hdr
;
2313 hdr
= elf_elfsections (abfd
)[i
];
2314 if (hdr
->sh_type
== type
2315 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
2317 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
2318 dyn
.d_un
.d_val
+= hdr
->sh_size
;
2321 if (dyn
.d_un
.d_val
== 0
2322 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
2323 dyn
.d_un
.d_val
= hdr
->sh_addr
;
2327 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
2333 /* If we have created any dynamic sections, then output them. */
2336 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
2339 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
2341 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
2342 || o
->_raw_size
== 0)
2344 if ((o
->flags
& SEC_IN_MEMORY
) == 0)
2346 /* At this point, we are only interested in sections
2347 created by elf_link_create_dynamic_sections. FIXME:
2348 This test is fragile. */
2351 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
2353 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
2355 if (! bfd_set_section_contents (abfd
, o
->output_section
,
2356 o
->contents
, o
->output_offset
,
2364 /* The contents of the .dynstr section are actually in a
2366 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
2367 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
2368 || ! _bfd_stringtab_emit (abfd
,
2369 elf_hash_table (info
)->dynstr
))
2375 /* If we have optimized stabs strings, output them. */
2376 if (elf_hash_table (info
)->stab_info
!= NULL
)
2378 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
2382 if (finfo
.symstrtab
!= NULL
)
2383 _bfd_stringtab_free (finfo
.symstrtab
);
2384 if (finfo
.contents
!= NULL
)
2385 free (finfo
.contents
);
2386 if (finfo
.external_relocs
!= NULL
)
2387 free (finfo
.external_relocs
);
2388 if (finfo
.internal_relocs
!= NULL
)
2389 free (finfo
.internal_relocs
);
2390 if (finfo
.external_syms
!= NULL
)
2391 free (finfo
.external_syms
);
2392 if (finfo
.internal_syms
!= NULL
)
2393 free (finfo
.internal_syms
);
2394 if (finfo
.indices
!= NULL
)
2395 free (finfo
.indices
);
2396 if (finfo
.sections
!= NULL
)
2397 free (finfo
.sections
);
2398 if (finfo
.symbuf
!= NULL
)
2399 free (finfo
.symbuf
);
2400 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2402 if ((o
->flags
& SEC_RELOC
) != 0
2403 && elf_section_data (o
)->rel_hashes
!= NULL
)
2404 free (elf_section_data (o
)->rel_hashes
);
2407 elf_tdata (abfd
)->linker
= true;
2412 if (finfo
.symstrtab
!= NULL
)
2413 _bfd_stringtab_free (finfo
.symstrtab
);
2414 if (finfo
.contents
!= NULL
)
2415 free (finfo
.contents
);
2416 if (finfo
.external_relocs
!= NULL
)
2417 free (finfo
.external_relocs
);
2418 if (finfo
.internal_relocs
!= NULL
)
2419 free (finfo
.internal_relocs
);
2420 if (finfo
.external_syms
!= NULL
)
2421 free (finfo
.external_syms
);
2422 if (finfo
.internal_syms
!= NULL
)
2423 free (finfo
.internal_syms
);
2424 if (finfo
.indices
!= NULL
)
2425 free (finfo
.indices
);
2426 if (finfo
.sections
!= NULL
)
2427 free (finfo
.sections
);
2428 if (finfo
.symbuf
!= NULL
)
2429 free (finfo
.symbuf
);
2430 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
2432 if ((o
->flags
& SEC_RELOC
) != 0
2433 && elf_section_data (o
)->rel_hashes
!= NULL
)
2434 free (elf_section_data (o
)->rel_hashes
);
2440 /* Add a symbol to the output symbol table. */
2443 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
2444 struct elf_final_link_info
*finfo
;
2446 Elf_Internal_Sym
*elfsym
;
2447 asection
*input_sec
;
2449 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
2450 struct bfd_link_info
*info
,
2455 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
2456 elf_backend_link_output_symbol_hook
;
2457 if (output_symbol_hook
!= NULL
)
2459 if (! ((*output_symbol_hook
)
2460 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
2464 if (name
== (const char *) NULL
|| *name
== '\0')
2465 elfsym
->st_name
= 0;
2468 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
2471 if (elfsym
->st_name
== (unsigned long) -1)
2475 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
2477 if (! elf_link_flush_output_syms (finfo
))
2481 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
2482 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
2483 ++finfo
->symbuf_count
;
2485 ++finfo
->output_bfd
->symcount
;
2490 /* Flush the output symbols to the file. */
2493 elf_link_flush_output_syms (finfo
)
2494 struct elf_final_link_info
*finfo
;
2496 if (finfo
->symbuf_count
> 0)
2498 Elf_Internal_Shdr
*symtab
;
2500 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
2502 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
2504 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
2505 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
2506 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
2509 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
2511 finfo
->symbuf_count
= 0;
2517 /* Add an external symbol to the symbol table. This is called from
2518 the hash table traversal routine. */
2521 elf_link_output_extsym (h
, data
)
2522 struct elf_link_hash_entry
*h
;
2525 struct elf_finfo_failed
*eif
= (struct elf_finfo_failed
*) data
;
2526 struct elf_final_link_info
*finfo
= eif
->finfo
;
2528 Elf_Internal_Sym sym
;
2529 asection
*input_sec
;
2531 /* If we are not creating a shared library, and this symbol is
2532 referenced by a shared library but is not defined anywhere, then
2533 warn that it is undefined. If we do not do this, the runtime
2534 linker will complain that the symbol is undefined when the
2535 program is run. We don't have to worry about symbols that are
2536 referenced by regular files, because we will already have issued
2537 warnings for them. */
2538 if (! finfo
->info
->relocateable
2539 && ! finfo
->info
->shared
2540 && h
->root
.type
== bfd_link_hash_undefined
2541 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
2542 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2544 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
2545 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
2546 (asection
*) NULL
, 0)))
2553 /* We don't want to output symbols that have never been mentioned by
2554 a regular file, or that we have been told to strip. However, if
2555 h->indx is set to -2, the symbol is used by a reloc and we must
2559 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2560 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2561 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2562 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
2564 else if (finfo
->info
->strip
== strip_all
2565 || (finfo
->info
->strip
== strip_some
2566 && bfd_hash_lookup (finfo
->info
->keep_hash
,
2567 h
->root
.root
.string
,
2568 false, false) == NULL
))
2573 /* If we're stripping it, and it's not a dynamic symbol, there's
2574 nothing else to do. */
2575 if (strip
&& h
->dynindx
== -1)
2579 sym
.st_size
= h
->size
;
2581 if (h
->root
.type
== bfd_link_hash_undefweak
2582 || h
->root
.type
== bfd_link_hash_defweak
)
2583 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
2585 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
2587 switch (h
->root
.type
)
2590 case bfd_link_hash_new
:
2594 case bfd_link_hash_undefined
:
2595 input_sec
= bfd_und_section_ptr
;
2596 sym
.st_shndx
= SHN_UNDEF
;
2599 case bfd_link_hash_undefweak
:
2600 input_sec
= bfd_und_section_ptr
;
2601 sym
.st_shndx
= SHN_UNDEF
;
2604 case bfd_link_hash_defined
:
2605 case bfd_link_hash_defweak
:
2607 input_sec
= h
->root
.u
.def
.section
;
2608 if (input_sec
->output_section
!= NULL
)
2611 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
2612 input_sec
->output_section
);
2613 if (sym
.st_shndx
== (unsigned short) -1)
2619 /* ELF symbols in relocateable files are section relative,
2620 but in nonrelocateable files they are virtual
2622 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
2623 if (! finfo
->info
->relocateable
)
2624 sym
.st_value
+= input_sec
->output_section
->vma
;
2628 BFD_ASSERT ((bfd_get_flavour (input_sec
->owner
)
2629 == bfd_target_elf_flavour
)
2630 && elf_elfheader (input_sec
->owner
)->e_type
== ET_DYN
);
2631 sym
.st_shndx
= SHN_UNDEF
;
2632 input_sec
= bfd_und_section_ptr
;
2637 case bfd_link_hash_common
:
2638 input_sec
= bfd_com_section_ptr
;
2639 sym
.st_shndx
= SHN_COMMON
;
2640 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
2643 case bfd_link_hash_indirect
:
2644 case bfd_link_hash_warning
:
2645 /* We can't represent these symbols in ELF. A warning symbol
2646 may have come from a .gnu.warning.SYMBOL section anyhow. We
2647 just put the target symbol in the hash table. If the target
2648 symbol does not really exist, don't do anything. */
2649 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
2651 return (elf_link_output_extsym
2652 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
2655 /* If this symbol should be put in the .dynsym section, then put it
2656 there now. We have already know the symbol index. We also fill
2657 in the entry in the .hash section. */
2658 if (h
->dynindx
!= -1
2659 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
2661 struct elf_backend_data
*bed
;
2664 bfd_byte
*bucketpos
;
2667 sym
.st_name
= h
->dynstr_index
;
2669 /* Give the processor backend a chance to tweak the symbol
2670 value, and also to finish up anything that needs to be done
2672 bed
= get_elf_backend_data (finfo
->output_bfd
);
2673 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
2674 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
2680 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
2681 (PTR
) (((Elf_External_Sym
*)
2682 finfo
->dynsym_sec
->contents
)
2685 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
2686 bucket
= (bfd_elf_hash ((const unsigned char *) h
->root
.root
.string
)
2688 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
2689 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
2690 chain
= get_word (finfo
->output_bfd
, bucketpos
);
2691 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
2692 put_word (finfo
->output_bfd
, chain
,
2693 ((bfd_byte
*) finfo
->hash_sec
->contents
2694 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
2697 /* If we're stripping it, then it was just a dynamic symbol, and
2698 there's nothing else to do. */
2702 h
->indx
= finfo
->output_bfd
->symcount
;
2704 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
2713 /* Link an input file into the linker output file. This function
2714 handles all the sections and relocations of the input file at once.
2715 This is so that we only have to read the local symbols once, and
2716 don't have to keep them in memory. */
2719 elf_link_input_bfd (finfo
, input_bfd
)
2720 struct elf_final_link_info
*finfo
;
2723 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
2724 bfd
*, asection
*, bfd_byte
*,
2725 Elf_Internal_Rela
*,
2726 Elf_Internal_Sym
*, asection
**));
2728 Elf_Internal_Shdr
*symtab_hdr
;
2731 Elf_External_Sym
*external_syms
;
2732 Elf_External_Sym
*esym
;
2733 Elf_External_Sym
*esymend
;
2734 Elf_Internal_Sym
*isym
;
2736 asection
**ppsection
;
2739 output_bfd
= finfo
->output_bfd
;
2741 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
2743 /* If this is a dynamic object, we don't want to do anything here:
2744 we don't want the local symbols, and we don't want the section
2746 if (elf_elfheader (input_bfd
)->e_type
== ET_DYN
)
2749 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
2750 if (elf_bad_symtab (input_bfd
))
2752 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
2757 locsymcount
= symtab_hdr
->sh_info
;
2758 extsymoff
= symtab_hdr
->sh_info
;
2761 /* Read the local symbols. */
2762 if (symtab_hdr
->contents
!= NULL
)
2763 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
2764 else if (locsymcount
== 0)
2765 external_syms
= NULL
;
2768 external_syms
= finfo
->external_syms
;
2769 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
2770 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
2771 locsymcount
, input_bfd
)
2772 != locsymcount
* sizeof (Elf_External_Sym
)))
2776 /* Swap in the local symbols and write out the ones which we know
2777 are going into the output file. */
2778 esym
= external_syms
;
2779 esymend
= esym
+ locsymcount
;
2780 isym
= finfo
->internal_syms
;
2781 pindex
= finfo
->indices
;
2782 ppsection
= finfo
->sections
;
2783 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
2787 Elf_Internal_Sym osym
;
2789 elf_swap_symbol_in (input_bfd
, esym
, isym
);
2792 if (elf_bad_symtab (input_bfd
))
2794 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
2801 if (isym
->st_shndx
== SHN_UNDEF
)
2802 isec
= bfd_und_section_ptr
;
2803 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
2804 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
2805 else if (isym
->st_shndx
== SHN_ABS
)
2806 isec
= bfd_abs_section_ptr
;
2807 else if (isym
->st_shndx
== SHN_COMMON
)
2808 isec
= bfd_com_section_ptr
;
2817 /* Don't output the first, undefined, symbol. */
2818 if (esym
== external_syms
)
2821 /* If we are stripping all symbols, we don't want to output this
2823 if (finfo
->info
->strip
== strip_all
)
2826 /* We never output section symbols. Instead, we use the section
2827 symbol of the corresponding section in the output file. */
2828 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
2831 /* If we are discarding all local symbols, we don't want to
2832 output this one. If we are generating a relocateable output
2833 file, then some of the local symbols may be required by
2834 relocs; we output them below as we discover that they are
2836 if (finfo
->info
->discard
== discard_all
)
2839 /* Get the name of the symbol. */
2840 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
2845 /* See if we are discarding symbols with this name. */
2846 if ((finfo
->info
->strip
== strip_some
2847 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
2849 || (finfo
->info
->discard
== discard_l
2850 && strncmp (name
, finfo
->info
->lprefix
,
2851 finfo
->info
->lprefix_len
) == 0))
2854 /* If we get here, we are going to output this symbol. */
2858 /* Adjust the section index for the output file. */
2859 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
2860 isec
->output_section
);
2861 if (osym
.st_shndx
== (unsigned short) -1)
2864 *pindex
= output_bfd
->symcount
;
2866 /* ELF symbols in relocateable files are section relative, but
2867 in executable files they are virtual addresses. Note that
2868 this code assumes that all ELF sections have an associated
2869 BFD section with a reasonable value for output_offset; below
2870 we assume that they also have a reasonable value for
2871 output_section. Any special sections must be set up to meet
2872 these requirements. */
2873 osym
.st_value
+= isec
->output_offset
;
2874 if (! finfo
->info
->relocateable
)
2875 osym
.st_value
+= isec
->output_section
->vma
;
2877 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
2881 /* Relocate the contents of each section. */
2882 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
2886 if (! o
->linker_mark
)
2888 /* This section was omitted from the link. */
2892 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
2893 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
2896 if ((o
->flags
& SEC_IN_MEMORY
) != 0
2897 && input_bfd
== elf_hash_table (finfo
->info
)->dynobj
)
2899 /* Section was created by elf_link_create_dynamic_sections.
2900 FIXME: This test is fragile. */
2904 /* Get the contents of the section. They have been cached by a
2905 relaxation routine. Note that o is a section in an input
2906 file, so the contents field will not have been set by any of
2907 the routines which work on output files. */
2908 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
2909 contents
= elf_section_data (o
)->this_hdr
.contents
;
2912 contents
= finfo
->contents
;
2913 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
2914 (file_ptr
) 0, o
->_raw_size
))
2918 if ((o
->flags
& SEC_RELOC
) != 0)
2920 Elf_Internal_Rela
*internal_relocs
;
2922 /* Get the swapped relocs. */
2923 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
2924 (input_bfd
, o
, finfo
->external_relocs
,
2925 finfo
->internal_relocs
, false));
2926 if (internal_relocs
== NULL
2927 && o
->reloc_count
> 0)
2930 /* Relocate the section by invoking a back end routine.
2932 The back end routine is responsible for adjusting the
2933 section contents as necessary, and (if using Rela relocs
2934 and generating a relocateable output file) adjusting the
2935 reloc addend as necessary.
2937 The back end routine does not have to worry about setting
2938 the reloc address or the reloc symbol index.
2940 The back end routine is given a pointer to the swapped in
2941 internal symbols, and can access the hash table entries
2942 for the external symbols via elf_sym_hashes (input_bfd).
2944 When generating relocateable output, the back end routine
2945 must handle STB_LOCAL/STT_SECTION symbols specially. The
2946 output symbol is going to be a section symbol
2947 corresponding to the output section, which will require
2948 the addend to be adjusted. */
2950 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
2951 input_bfd
, o
, contents
,
2953 finfo
->internal_syms
,
2957 if (finfo
->info
->relocateable
)
2959 Elf_Internal_Rela
*irela
;
2960 Elf_Internal_Rela
*irelaend
;
2961 struct elf_link_hash_entry
**rel_hash
;
2962 Elf_Internal_Shdr
*input_rel_hdr
;
2963 Elf_Internal_Shdr
*output_rel_hdr
;
2965 /* Adjust the reloc addresses and symbol indices. */
2967 irela
= internal_relocs
;
2968 irelaend
= irela
+ o
->reloc_count
;
2969 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
2970 + o
->output_section
->reloc_count
);
2971 for (; irela
< irelaend
; irela
++, rel_hash
++)
2973 unsigned long r_symndx
;
2974 Elf_Internal_Sym
*isym
;
2977 irela
->r_offset
+= o
->output_offset
;
2979 r_symndx
= ELF_R_SYM (irela
->r_info
);
2984 if (r_symndx
>= locsymcount
2985 || (elf_bad_symtab (input_bfd
)
2986 && finfo
->sections
[r_symndx
] == NULL
))
2990 /* This is a reloc against a global symbol. We
2991 have not yet output all the local symbols, so
2992 we do not know the symbol index of any global
2993 symbol. We set the rel_hash entry for this
2994 reloc to point to the global hash table entry
2995 for this symbol. The symbol index is then
2996 set at the end of elf_bfd_final_link. */
2997 indx
= r_symndx
- extsymoff
;
2998 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
3000 /* Setting the index to -2 tells
3001 elf_link_output_extsym that this symbol is
3003 BFD_ASSERT ((*rel_hash
)->indx
< 0);
3004 (*rel_hash
)->indx
= -2;
3009 /* This is a reloc against a local symbol. */
3012 isym
= finfo
->internal_syms
+ r_symndx
;
3013 sec
= finfo
->sections
[r_symndx
];
3014 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
3016 /* I suppose the backend ought to fill in the
3017 section of any STT_SECTION symbol against a
3018 processor specific section. */
3019 if (sec
!= NULL
&& bfd_is_abs_section (sec
))
3021 else if (sec
== NULL
|| sec
->owner
== NULL
)
3023 bfd_set_error (bfd_error_bad_value
);
3028 r_symndx
= sec
->output_section
->target_index
;
3029 BFD_ASSERT (r_symndx
!= 0);
3034 if (finfo
->indices
[r_symndx
] == -1)
3040 if (finfo
->info
->strip
== strip_all
)
3042 /* You can't do ld -r -s. */
3043 bfd_set_error (bfd_error_invalid_operation
);
3047 /* This symbol was skipped earlier, but
3048 since it is needed by a reloc, we
3049 must output it now. */
3050 link
= symtab_hdr
->sh_link
;
3051 name
= bfd_elf_string_from_elf_section (input_bfd
,
3057 osec
= sec
->output_section
;
3059 _bfd_elf_section_from_bfd_section (output_bfd
,
3061 if (isym
->st_shndx
== (unsigned short) -1)
3064 isym
->st_value
+= sec
->output_offset
;
3065 if (! finfo
->info
->relocateable
)
3066 isym
->st_value
+= osec
->vma
;
3068 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
3070 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
3074 r_symndx
= finfo
->indices
[r_symndx
];
3077 irela
->r_info
= ELF_R_INFO (r_symndx
,
3078 ELF_R_TYPE (irela
->r_info
));
3081 /* Swap out the relocs. */
3082 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3083 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
3084 BFD_ASSERT (output_rel_hdr
->sh_entsize
3085 == input_rel_hdr
->sh_entsize
);
3086 irela
= internal_relocs
;
3087 irelaend
= irela
+ o
->reloc_count
;
3088 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3090 Elf_External_Rel
*erel
;
3092 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
3093 + o
->output_section
->reloc_count
);
3094 for (; irela
< irelaend
; irela
++, erel
++)
3096 Elf_Internal_Rel irel
;
3098 irel
.r_offset
= irela
->r_offset
;
3099 irel
.r_info
= irela
->r_info
;
3100 BFD_ASSERT (irela
->r_addend
== 0);
3101 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3106 Elf_External_Rela
*erela
;
3108 BFD_ASSERT (input_rel_hdr
->sh_entsize
3109 == sizeof (Elf_External_Rela
));
3110 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
3111 + o
->output_section
->reloc_count
);
3112 for (; irela
< irelaend
; irela
++, erela
++)
3113 elf_swap_reloca_out (output_bfd
, irela
, erela
);
3116 o
->output_section
->reloc_count
+= o
->reloc_count
;
3120 /* Write out the modified section contents. */
3121 if (elf_section_data (o
)->stab_info
== NULL
)
3123 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
3124 contents
, o
->output_offset
,
3125 (o
->_cooked_size
!= 0
3132 if (! _bfd_write_section_stabs (output_bfd
, o
,
3133 &elf_section_data (o
)->stab_info
,
3142 /* Generate a reloc when linking an ELF file. This is a reloc
3143 requested by the linker, and does come from any input file. This
3144 is used to build constructor and destructor tables when linking
3148 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
3150 struct bfd_link_info
*info
;
3151 asection
*output_section
;
3152 struct bfd_link_order
*link_order
;
3154 reloc_howto_type
*howto
;
3158 struct elf_link_hash_entry
**rel_hash_ptr
;
3159 Elf_Internal_Shdr
*rel_hdr
;
3161 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
3164 bfd_set_error (bfd_error_bad_value
);
3168 addend
= link_order
->u
.reloc
.p
->addend
;
3170 /* Figure out the symbol index. */
3171 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
3172 + output_section
->reloc_count
);
3173 if (link_order
->type
== bfd_section_reloc_link_order
)
3175 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
3176 BFD_ASSERT (indx
!= 0);
3177 *rel_hash_ptr
= NULL
;
3181 struct elf_link_hash_entry
*h
;
3183 /* Treat a reloc against a defined symbol as though it were
3184 actually against the section. */
3185 h
= ((struct elf_link_hash_entry
*)
3186 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
3187 link_order
->u
.reloc
.p
->u
.name
,
3188 false, false, true));
3190 && (h
->root
.type
== bfd_link_hash_defined
3191 || h
->root
.type
== bfd_link_hash_defweak
))
3195 section
= h
->root
.u
.def
.section
;
3196 indx
= section
->output_section
->target_index
;
3197 *rel_hash_ptr
= NULL
;
3198 /* It seems that we ought to add the symbol value to the
3199 addend here, but in practice it has already been added
3200 because it was passed to constructor_callback. */
3201 addend
+= section
->output_section
->vma
+ section
->output_offset
;
3205 /* Setting the index to -2 tells elf_link_output_extsym that
3206 this symbol is used by a reloc. */
3213 if (! ((*info
->callbacks
->unattached_reloc
)
3214 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
3215 (asection
*) NULL
, (bfd_vma
) 0)))
3221 /* If this is an inplace reloc, we must write the addend into the
3223 if (howto
->partial_inplace
&& addend
!= 0)
3226 bfd_reloc_status_type rstat
;
3230 size
= bfd_get_reloc_size (howto
);
3231 buf
= (bfd_byte
*) bfd_zmalloc (size
);
3232 if (buf
== (bfd_byte
*) NULL
)
3234 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
3240 case bfd_reloc_outofrange
:
3242 case bfd_reloc_overflow
:
3243 if (! ((*info
->callbacks
->reloc_overflow
)
3245 (link_order
->type
== bfd_section_reloc_link_order
3246 ? bfd_section_name (output_bfd
,
3247 link_order
->u
.reloc
.p
->u
.section
)
3248 : link_order
->u
.reloc
.p
->u
.name
),
3249 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
3257 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
3258 (file_ptr
) link_order
->offset
, size
);
3264 /* The address of a reloc is relative to the section in a
3265 relocateable file, and is a virtual address in an executable
3267 offset
= link_order
->offset
;
3268 if (! info
->relocateable
)
3269 offset
+= output_section
->vma
;
3271 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
3273 if (rel_hdr
->sh_type
== SHT_REL
)
3275 Elf_Internal_Rel irel
;
3276 Elf_External_Rel
*erel
;
3278 irel
.r_offset
= offset
;
3279 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3280 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
3281 + output_section
->reloc_count
);
3282 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
3286 Elf_Internal_Rela irela
;
3287 Elf_External_Rela
*erela
;
3289 irela
.r_offset
= offset
;
3290 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
3291 irela
.r_addend
= addend
;
3292 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
3293 + output_section
->reloc_count
);
3294 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
3297 ++output_section
->reloc_count
;
3303 /* Allocate a pointer to live in a linker created section. */
3306 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
3308 struct bfd_link_info
*info
;
3309 elf_linker_section_t
*lsect
;
3310 struct elf_link_hash_entry
*h
;
3311 const Elf_Internal_Rela
*rel
;
3313 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
3314 elf_linker_section_pointers_t
*linker_section_ptr
;
3315 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
3317 BFD_ASSERT (lsect
!= NULL
);
3319 /* Is this a global symbol? */
3322 /* Has this symbol already been allocated, if so, our work is done */
3323 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3328 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
3329 /* Make sure this symbol is output as a dynamic symbol. */
3330 if (h
->dynindx
== -1)
3332 if (! elf_link_record_dynamic_symbol (info
, h
))
3336 if (lsect
->rel_section
)
3337 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3340 else /* Allocation of a pointer to a local symbol */
3342 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
3344 /* Allocate a table to hold the local symbols if first time */
3347 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
3348 register unsigned int i
;
3350 ptr
= (elf_linker_section_pointers_t
**)
3351 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
3356 elf_local_ptr_offsets (abfd
) = ptr
;
3357 for (i
= 0; i
< num_symbols
; i
++)
3358 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
3361 /* Has this symbol already been allocated, if so, our work is done */
3362 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
3367 ptr_linker_section_ptr
= &ptr
[r_symndx
];
3371 /* If we are generating a shared object, we need to
3372 output a R_<xxx>_RELATIVE reloc so that the
3373 dynamic linker can adjust this GOT entry. */
3374 BFD_ASSERT (lsect
->rel_section
!= NULL
);
3375 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
3379 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
3380 from internal memory. */
3381 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
3382 linker_section_ptr
= (elf_linker_section_pointers_t
*)
3383 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
3385 if (!linker_section_ptr
)
3388 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
3389 linker_section_ptr
->addend
= rel
->r_addend
;
3390 linker_section_ptr
->which
= lsect
->which
;
3391 linker_section_ptr
->written_address_p
= false;
3392 *ptr_linker_section_ptr
= linker_section_ptr
;
3395 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
3397 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
3398 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
3399 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
3400 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
3402 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
3404 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
3405 lsect
->sym_hash
->root
.root
.string
,
3406 (long)ARCH_SIZE
/ 8,
3407 (long)lsect
->sym_hash
->root
.u
.def
.value
);
3413 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
3415 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
3418 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
3419 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
3427 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
3430 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
3433 /* Fill in the address for a pointer generated in alinker section. */
3436 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
3439 struct bfd_link_info
*info
;
3440 elf_linker_section_t
*lsect
;
3441 struct elf_link_hash_entry
*h
;
3443 const Elf_Internal_Rela
*rel
;
3446 elf_linker_section_pointers_t
*linker_section_ptr
;
3448 BFD_ASSERT (lsect
!= NULL
);
3450 if (h
!= NULL
) /* global symbol */
3452 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
3456 BFD_ASSERT (linker_section_ptr
!= NULL
);
3458 if (! elf_hash_table (info
)->dynamic_sections_created
3461 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
3463 /* This is actually a static link, or it is a
3464 -Bsymbolic link and the symbol is defined
3465 locally. We must initialize this entry in the
3468 When doing a dynamic link, we create a .rela.<xxx>
3469 relocation entry to initialize the value. This
3470 is done in the finish_dynamic_symbol routine. */
3471 if (!linker_section_ptr
->written_address_p
)
3473 linker_section_ptr
->written_address_p
= true;
3474 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3475 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3479 else /* local symbol */
3481 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
3482 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
3483 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
3484 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
3488 BFD_ASSERT (linker_section_ptr
!= NULL
);
3490 /* Write out pointer if it hasn't been rewritten out before */
3491 if (!linker_section_ptr
->written_address_p
)
3493 linker_section_ptr
->written_address_p
= true;
3494 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
3495 lsect
->section
->contents
+ linker_section_ptr
->offset
);
3499 asection
*srel
= lsect
->rel_section
;
3500 Elf_Internal_Rela outrel
;
3502 /* We need to generate a relative reloc for the dynamic linker. */
3504 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
3507 BFD_ASSERT (srel
!= NULL
);
3509 outrel
.r_offset
= (lsect
->section
->output_section
->vma
3510 + lsect
->section
->output_offset
3511 + linker_section_ptr
->offset
);
3512 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
3513 outrel
.r_addend
= 0;
3514 elf_swap_reloca_out (output_bfd
, &outrel
,
3515 (((Elf_External_Rela
*)
3516 lsect
->section
->contents
)
3517 + lsect
->section
->reloc_count
));
3518 ++lsect
->section
->reloc_count
;
3523 relocation
= (lsect
->section
->output_offset
3524 + linker_section_ptr
->offset
3525 - lsect
->hole_offset
3526 - lsect
->sym_offset
);
3529 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
3530 lsect
->name
, (long)relocation
, (long)relocation
);
3533 /* Subtract out the addend, because it will get added back in by the normal
3535 return relocation
- linker_section_ptr
->addend
;