1 /* 32-bit ELF support for ARM
2 Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 typedef unsigned long int insn32
;
26 typedef unsigned short int insn16
;
28 static bfd_boolean elf32_arm_set_private_flags
29 PARAMS ((bfd
*, flagword
));
30 static bfd_boolean elf32_arm_copy_private_bfd_data
31 PARAMS ((bfd
*, bfd
*));
32 static bfd_boolean elf32_arm_merge_private_bfd_data
33 PARAMS ((bfd
*, bfd
*));
34 static bfd_boolean elf32_arm_print_private_bfd_data
35 PARAMS ((bfd
*, PTR
));
36 static int elf32_arm_get_symbol_type
37 PARAMS (( Elf_Internal_Sym
*, int));
38 static struct bfd_link_hash_table
*elf32_arm_link_hash_table_create
40 static bfd_reloc_status_type elf32_arm_final_link_relocate
41 PARAMS ((reloc_howto_type
*, bfd
*, bfd
*, asection
*, bfd_byte
*,
42 Elf_Internal_Rela
*, bfd_vma
, struct bfd_link_info
*, asection
*,
43 const char *, int, struct elf_link_hash_entry
*));
44 static insn32 insert_thumb_branch
45 PARAMS ((insn32
, int));
46 static struct elf_link_hash_entry
*find_thumb_glue
47 PARAMS ((struct bfd_link_info
*, const char *, bfd
*));
48 static struct elf_link_hash_entry
*find_arm_glue
49 PARAMS ((struct bfd_link_info
*, const char *, bfd
*));
50 static void elf32_arm_post_process_headers
51 PARAMS ((bfd
*, struct bfd_link_info
*));
52 static int elf32_arm_to_thumb_stub
53 PARAMS ((struct bfd_link_info
*, const char *, bfd
*, bfd
*, asection
*,
54 bfd_byte
*, asection
*, bfd_vma
, bfd_signed_vma
, bfd_vma
));
55 static int elf32_thumb_to_arm_stub
56 PARAMS ((struct bfd_link_info
*, const char *, bfd
*, bfd
*, asection
*,
57 bfd_byte
*, asection
*, bfd_vma
, bfd_signed_vma
, bfd_vma
));
58 static bfd_boolean elf32_arm_relocate_section
59 PARAMS ((bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
60 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**));
61 static asection
* elf32_arm_gc_mark_hook
62 PARAMS ((asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
63 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
64 static bfd_boolean elf32_arm_gc_sweep_hook
65 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
66 const Elf_Internal_Rela
*));
67 static bfd_boolean elf32_arm_check_relocs
68 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
69 const Elf_Internal_Rela
*));
70 static bfd_boolean elf32_arm_find_nearest_line
71 PARAMS ((bfd
*, asection
*, asymbol
**, bfd_vma
, const char **,
72 const char **, unsigned int *));
73 static bfd_boolean elf32_arm_adjust_dynamic_symbol
74 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
75 static bfd_boolean elf32_arm_size_dynamic_sections
76 PARAMS ((bfd
*, struct bfd_link_info
*));
77 static bfd_boolean elf32_arm_finish_dynamic_symbol
78 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
80 static bfd_boolean elf32_arm_finish_dynamic_sections
81 PARAMS ((bfd
*, struct bfd_link_info
*));
82 static struct bfd_hash_entry
* elf32_arm_link_hash_newfunc
83 PARAMS ((struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *));
85 static void arm_add_to_rel
86 PARAMS ((bfd
*, bfd_byte
*, reloc_howto_type
*, bfd_signed_vma
));
88 static bfd_boolean allocate_dynrelocs
89 PARAMS ((struct elf_link_hash_entry
*h
, PTR inf
));
90 static bfd_boolean create_got_section
91 PARAMS ((bfd
* dynobj
, struct bfd_link_info
* info
));
92 static bfd_boolean elf32_arm_create_dynamic_sections
93 PARAMS ((bfd
* dynobj
, struct bfd_link_info
* info
));
94 static enum elf_reloc_type_class elf32_arm_reloc_type_class
95 PARAMS ((const Elf_Internal_Rela
*));
96 static bfd_boolean elf32_arm_object_p
99 #ifndef ELFARM_NABI_C_INCLUDED
100 static void record_arm_to_thumb_glue
101 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
102 static void record_thumb_to_arm_glue
103 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
104 bfd_boolean bfd_elf32_arm_allocate_interworking_sections
105 PARAMS ((struct bfd_link_info
*));
106 bfd_boolean bfd_elf32_arm_get_bfd_for_interworking
107 PARAMS ((bfd
*, struct bfd_link_info
*));
108 bfd_boolean bfd_elf32_arm_process_before_allocation
109 PARAMS ((bfd
*, struct bfd_link_info
*, int, int));
113 #define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK)
115 /* The linker script knows the section names for placement.
116 The entry_names are used to do simple name mangling on the stubs.
117 Given a function name, and its type, the stub can be found. The
118 name can be changed. The only requirement is the %s be present. */
119 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
120 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
122 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
123 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
125 /* The name of the dynamic interpreter. This is put in the .interp
127 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
131 /* The size in bytes of the special first entry in the procedure
133 #define PLT_HEADER_SIZE 16
135 /* The size in bytes of an entry in the procedure linkage table. */
136 #define PLT_ENTRY_SIZE 16
138 /* The first entry in a procedure linkage table looks like
139 this. It is set up so that any shared library function that is
140 called before the relocation has been set up calls the dynamic
142 static const bfd_vma elf32_arm_plt0_entry
[PLT_HEADER_SIZE
/ 4] =
144 0xe52de004, /* str lr, [sp, #-4]! */
145 0xe59fe010, /* ldr lr, [pc, #16] */
146 0xe08fe00e, /* add lr, pc, lr */
147 0xe5bef008, /* ldr pc, [lr, #8]! */
150 /* Subsequent entries in a procedure linkage table look like
152 static const bfd_vma elf32_arm_plt_entry
[PLT_ENTRY_SIZE
/ 4] =
154 0xe28fc600, /* add ip, pc, #NN */
155 0xe28cca00, /* add ip, ip, #NN */
156 0xe5bcf000, /* ldr pc, [ip, #NN]! */
157 0x00000000, /* unused */
162 /* The size in bytes of the special first entry in the procedure
164 #define PLT_HEADER_SIZE 20
166 /* The size in bytes of an entry in the procedure linkage table. */
167 #define PLT_ENTRY_SIZE 12
169 /* The first entry in a procedure linkage table looks like
170 this. It is set up so that any shared library function that is
171 called before the relocation has been set up calls the dynamic
173 static const bfd_vma elf32_arm_plt0_entry
[PLT_HEADER_SIZE
/ 4] =
175 0xe52de004, /* str lr, [sp, #-4]! */
176 0xe59fe004, /* ldr lr, [pc, #4] */
177 0xe08fe00e, /* add lr, pc, lr */
178 0xe5bef008, /* ldr pc, [lr, #8]! */
179 0x00000000, /* &GOT[0] - . */
182 /* Subsequent entries in a procedure linkage table look like
184 static const bfd_vma elf32_arm_plt_entry
[PLT_ENTRY_SIZE
/ 4] =
186 0xe28fc600, /* add ip, pc, #0xNN00000 */
187 0xe28cca00, /* add ip, ip, #0xNN000 */
188 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */
193 /* Used to build a map of a section. This is required for mixed-endian
196 typedef struct elf32_elf_section_map
201 elf32_arm_section_map
;
203 struct _arm_elf_section_data
205 struct bfd_elf_section_data elf
;
207 elf32_arm_section_map
*map
;
210 #define elf32_arm_section_data(sec) \
211 ((struct _arm_elf_section_data *) elf_section_data (sec))
213 /* The ARM linker needs to keep track of the number of relocs that it
214 decides to copy in check_relocs for each symbol. This is so that
215 it can discard PC relative relocs if it doesn't need them when
216 linking with -Bsymbolic. We store the information in a field
217 extending the regular ELF linker hash table. */
219 /* This structure keeps track of the number of PC relative relocs we
220 have copied for a given symbol. */
221 struct elf32_arm_relocs_copied
224 struct elf32_arm_relocs_copied
* next
;
225 /* A section in dynobj. */
227 /* Number of relocs copied in this section. */
231 /* Arm ELF linker hash entry. */
232 struct elf32_arm_link_hash_entry
234 struct elf_link_hash_entry root
;
236 /* Number of PC relative relocs copied for this symbol. */
237 struct elf32_arm_relocs_copied
* relocs_copied
;
240 /* Traverse an arm ELF linker hash table. */
241 #define elf32_arm_link_hash_traverse(table, func, info) \
242 (elf_link_hash_traverse \
244 (bfd_boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
247 /* Get the ARM elf linker hash table from a link_info structure. */
248 #define elf32_arm_hash_table(info) \
249 ((struct elf32_arm_link_hash_table *) ((info)->hash))
251 /* ARM ELF linker hash table. */
252 struct elf32_arm_link_hash_table
254 /* The main hash table. */
255 struct elf_link_hash_table root
;
257 /* The size in bytes of the section containing the Thumb-to-ARM glue. */
258 bfd_size_type thumb_glue_size
;
260 /* The size in bytes of the section containing the ARM-to-Thumb glue. */
261 bfd_size_type arm_glue_size
;
263 /* An arbitrary input BFD chosen to hold the glue sections. */
264 bfd
* bfd_of_glue_owner
;
266 /* A boolean indicating whether knowledge of the ARM's pipeline
267 length should be applied by the linker. */
268 int no_pipeline_knowledge
;
270 /* Nonzero to output a BE8 image. */
273 /* Short-cuts to get to dynamic linker sections. */
282 /* Small local sym to section mapping cache. */
283 struct sym_sec_cache sym_sec
;
286 /* Create an entry in an ARM ELF linker hash table. */
288 static struct bfd_hash_entry
*
289 elf32_arm_link_hash_newfunc (entry
, table
, string
)
290 struct bfd_hash_entry
* entry
;
291 struct bfd_hash_table
* table
;
294 struct elf32_arm_link_hash_entry
* ret
=
295 (struct elf32_arm_link_hash_entry
*) entry
;
297 /* Allocate the structure if it has not already been allocated by a
299 if (ret
== (struct elf32_arm_link_hash_entry
*) NULL
)
300 ret
= ((struct elf32_arm_link_hash_entry
*)
301 bfd_hash_allocate (table
,
302 sizeof (struct elf32_arm_link_hash_entry
)));
303 if (ret
== (struct elf32_arm_link_hash_entry
*) NULL
)
304 return (struct bfd_hash_entry
*) ret
;
306 /* Call the allocation method of the superclass. */
307 ret
= ((struct elf32_arm_link_hash_entry
*)
308 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry
*) ret
,
310 if (ret
!= (struct elf32_arm_link_hash_entry
*) NULL
)
311 ret
->relocs_copied
= NULL
;
313 return (struct bfd_hash_entry
*) ret
;
316 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
317 shortcuts to them in our hash table. */
320 create_got_section (dynobj
, info
)
322 struct bfd_link_info
*info
;
324 struct elf32_arm_link_hash_table
*htab
;
326 if (! _bfd_elf_create_got_section (dynobj
, info
))
329 htab
= elf32_arm_hash_table (info
);
330 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
331 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
332 if (!htab
->sgot
|| !htab
->sgotplt
)
335 htab
->srelgot
= bfd_make_section (dynobj
, ".rel.got");
336 if (htab
->srelgot
== NULL
337 || ! bfd_set_section_flags (dynobj
, htab
->srelgot
,
338 (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
339 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
341 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
346 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
347 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
351 elf32_arm_create_dynamic_sections (dynobj
, info
)
353 struct bfd_link_info
*info
;
355 struct elf32_arm_link_hash_table
*htab
;
357 htab
= elf32_arm_hash_table (info
);
358 if (!htab
->sgot
&& !create_got_section (dynobj
, info
))
361 if (!_bfd_elf_create_dynamic_sections (dynobj
, info
))
364 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
365 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rel.plt");
366 htab
->sdynbss
= bfd_get_section_by_name (dynobj
, ".dynbss");
368 htab
->srelbss
= bfd_get_section_by_name (dynobj
, ".rel.bss");
370 if (!htab
->splt
|| !htab
->srelplt
|| !htab
->sdynbss
371 || (!info
->shared
&& !htab
->srelbss
))
377 /* Copy the extra info we tack onto an elf_link_hash_entry. */
380 elf32_arm_copy_indirect_symbol (const struct elf_backend_data
*bed
,
381 struct elf_link_hash_entry
*dir
,
382 struct elf_link_hash_entry
*ind
)
384 struct elf32_arm_link_hash_entry
*edir
, *eind
;
386 edir
= (struct elf32_arm_link_hash_entry
*) dir
;
387 eind
= (struct elf32_arm_link_hash_entry
*) ind
;
389 if (eind
->relocs_copied
!= NULL
)
391 if (edir
->relocs_copied
!= NULL
)
393 struct elf32_arm_relocs_copied
**pp
;
394 struct elf32_arm_relocs_copied
*p
;
396 if (ind
->root
.type
== bfd_link_hash_indirect
)
399 /* Add reloc counts against the weak sym to the strong sym
400 list. Merge any entries against the same section. */
401 for (pp
= &eind
->relocs_copied
; (p
= *pp
) != NULL
; )
403 struct elf32_arm_relocs_copied
*q
;
405 for (q
= edir
->relocs_copied
; q
!= NULL
; q
= q
->next
)
406 if (q
->section
== p
->section
)
408 q
->count
+= p
->count
;
415 *pp
= edir
->relocs_copied
;
418 edir
->relocs_copied
= eind
->relocs_copied
;
419 eind
->relocs_copied
= NULL
;
422 _bfd_elf_link_hash_copy_indirect (bed
, dir
, ind
);
425 /* Create an ARM elf linker hash table. */
427 static struct bfd_link_hash_table
*
428 elf32_arm_link_hash_table_create (abfd
)
431 struct elf32_arm_link_hash_table
*ret
;
432 bfd_size_type amt
= sizeof (struct elf32_arm_link_hash_table
);
434 ret
= (struct elf32_arm_link_hash_table
*) bfd_malloc (amt
);
435 if (ret
== (struct elf32_arm_link_hash_table
*) NULL
)
438 if (!_bfd_elf_link_hash_table_init (&ret
->root
, abfd
,
439 elf32_arm_link_hash_newfunc
))
452 ret
->thumb_glue_size
= 0;
453 ret
->arm_glue_size
= 0;
454 ret
->bfd_of_glue_owner
= NULL
;
455 ret
->no_pipeline_knowledge
= 0;
456 ret
->byteswap_code
= 0;
457 ret
->sym_sec
.abfd
= NULL
;
459 return &ret
->root
.root
;
462 /* Locate the Thumb encoded calling stub for NAME. */
464 static struct elf_link_hash_entry
*
465 find_thumb_glue (link_info
, name
, input_bfd
)
466 struct bfd_link_info
*link_info
;
471 struct elf_link_hash_entry
*hash
;
472 struct elf32_arm_link_hash_table
*hash_table
;
474 /* We need a pointer to the armelf specific hash table. */
475 hash_table
= elf32_arm_hash_table (link_info
);
477 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
478 + strlen (THUMB2ARM_GLUE_ENTRY_NAME
) + 1);
480 BFD_ASSERT (tmp_name
);
482 sprintf (tmp_name
, THUMB2ARM_GLUE_ENTRY_NAME
, name
);
484 hash
= elf_link_hash_lookup
485 (&(hash_table
)->root
, tmp_name
, FALSE
, FALSE
, TRUE
);
488 /* xgettext:c-format */
489 (*_bfd_error_handler
) (_("%s: unable to find THUMB glue '%s' for `%s'"),
490 bfd_archive_filename (input_bfd
), tmp_name
, name
);
497 /* Locate the ARM encoded calling stub for NAME. */
499 static struct elf_link_hash_entry
*
500 find_arm_glue (link_info
, name
, input_bfd
)
501 struct bfd_link_info
*link_info
;
506 struct elf_link_hash_entry
*myh
;
507 struct elf32_arm_link_hash_table
*hash_table
;
509 /* We need a pointer to the elfarm specific hash table. */
510 hash_table
= elf32_arm_hash_table (link_info
);
512 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
513 + strlen (ARM2THUMB_GLUE_ENTRY_NAME
) + 1);
515 BFD_ASSERT (tmp_name
);
517 sprintf (tmp_name
, ARM2THUMB_GLUE_ENTRY_NAME
, name
);
519 myh
= elf_link_hash_lookup
520 (&(hash_table
)->root
, tmp_name
, FALSE
, FALSE
, TRUE
);
523 /* xgettext:c-format */
524 (*_bfd_error_handler
) (_("%s: unable to find ARM glue '%s' for `%s'"),
525 bfd_archive_filename (input_bfd
), tmp_name
, name
);
539 .word func @ behave as if you saw a ARM_32 reloc. */
541 #define ARM2THUMB_GLUE_SIZE 12
542 static const insn32 a2t1_ldr_insn
= 0xe59fc000;
543 static const insn32 a2t2_bx_r12_insn
= 0xe12fff1c;
544 static const insn32 a2t3_func_addr_insn
= 0x00000001;
546 /* Thumb->ARM: Thumb->(non-interworking aware) ARM
550 __func_from_thumb: __func_from_thumb:
552 nop ldr r6, __func_addr
554 __func_change_to_arm: bx r6
556 __func_back_to_thumb:
562 #define THUMB2ARM_GLUE_SIZE 8
563 static const insn16 t2a1_bx_pc_insn
= 0x4778;
564 static const insn16 t2a2_noop_insn
= 0x46c0;
565 static const insn32 t2a3_b_insn
= 0xea000000;
567 #ifndef ELFARM_NABI_C_INCLUDED
569 bfd_elf32_arm_allocate_interworking_sections (info
)
570 struct bfd_link_info
* info
;
574 struct elf32_arm_link_hash_table
* globals
;
576 globals
= elf32_arm_hash_table (info
);
578 BFD_ASSERT (globals
!= NULL
);
580 if (globals
->arm_glue_size
!= 0)
582 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
584 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
585 ARM2THUMB_GLUE_SECTION_NAME
);
587 BFD_ASSERT (s
!= NULL
);
589 foo
= (bfd_byte
*) bfd_alloc (globals
->bfd_of_glue_owner
,
590 globals
->arm_glue_size
);
592 s
->_raw_size
= s
->_cooked_size
= globals
->arm_glue_size
;
596 if (globals
->thumb_glue_size
!= 0)
598 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
600 s
= bfd_get_section_by_name
601 (globals
->bfd_of_glue_owner
, THUMB2ARM_GLUE_SECTION_NAME
);
603 BFD_ASSERT (s
!= NULL
);
605 foo
= (bfd_byte
*) bfd_alloc (globals
->bfd_of_glue_owner
,
606 globals
->thumb_glue_size
);
608 s
->_raw_size
= s
->_cooked_size
= globals
->thumb_glue_size
;
616 record_arm_to_thumb_glue (link_info
, h
)
617 struct bfd_link_info
* link_info
;
618 struct elf_link_hash_entry
* h
;
620 const char * name
= h
->root
.root
.string
;
623 struct elf_link_hash_entry
* myh
;
624 struct bfd_link_hash_entry
* bh
;
625 struct elf32_arm_link_hash_table
* globals
;
628 globals
= elf32_arm_hash_table (link_info
);
630 BFD_ASSERT (globals
!= NULL
);
631 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
633 s
= bfd_get_section_by_name
634 (globals
->bfd_of_glue_owner
, ARM2THUMB_GLUE_SECTION_NAME
);
636 BFD_ASSERT (s
!= NULL
);
638 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
639 + strlen (ARM2THUMB_GLUE_ENTRY_NAME
) + 1);
641 BFD_ASSERT (tmp_name
);
643 sprintf (tmp_name
, ARM2THUMB_GLUE_ENTRY_NAME
, name
);
645 myh
= elf_link_hash_lookup
646 (&(globals
)->root
, tmp_name
, FALSE
, FALSE
, TRUE
);
650 /* We've already seen this guy. */
655 /* The only trick here is using hash_table->arm_glue_size as the value. Even
656 though the section isn't allocated yet, this is where we will be putting
659 val
= globals
->arm_glue_size
+ 1;
660 _bfd_generic_link_add_one_symbol (link_info
, globals
->bfd_of_glue_owner
,
661 tmp_name
, BSF_GLOBAL
, s
, val
,
662 NULL
, TRUE
, FALSE
, &bh
);
666 globals
->arm_glue_size
+= ARM2THUMB_GLUE_SIZE
;
672 record_thumb_to_arm_glue (link_info
, h
)
673 struct bfd_link_info
*link_info
;
674 struct elf_link_hash_entry
*h
;
676 const char *name
= h
->root
.root
.string
;
679 struct elf_link_hash_entry
*myh
;
680 struct bfd_link_hash_entry
*bh
;
681 struct elf32_arm_link_hash_table
*hash_table
;
685 hash_table
= elf32_arm_hash_table (link_info
);
687 BFD_ASSERT (hash_table
!= NULL
);
688 BFD_ASSERT (hash_table
->bfd_of_glue_owner
!= NULL
);
690 s
= bfd_get_section_by_name
691 (hash_table
->bfd_of_glue_owner
, THUMB2ARM_GLUE_SECTION_NAME
);
693 BFD_ASSERT (s
!= NULL
);
695 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
696 + strlen (THUMB2ARM_GLUE_ENTRY_NAME
) + 1);
698 BFD_ASSERT (tmp_name
);
700 sprintf (tmp_name
, THUMB2ARM_GLUE_ENTRY_NAME
, name
);
702 myh
= elf_link_hash_lookup
703 (&(hash_table
)->root
, tmp_name
, FALSE
, FALSE
, TRUE
);
707 /* We've already seen this guy. */
713 val
= hash_table
->thumb_glue_size
+ 1;
714 _bfd_generic_link_add_one_symbol (link_info
, hash_table
->bfd_of_glue_owner
,
715 tmp_name
, BSF_GLOBAL
, s
, val
,
716 NULL
, TRUE
, FALSE
, &bh
);
718 /* If we mark it 'Thumb', the disassembler will do a better job. */
719 myh
= (struct elf_link_hash_entry
*) bh
;
720 bind
= ELF_ST_BIND (myh
->type
);
721 myh
->type
= ELF_ST_INFO (bind
, STT_ARM_TFUNC
);
725 #define CHANGE_TO_ARM "__%s_change_to_arm"
726 #define BACK_FROM_ARM "__%s_back_from_arm"
728 /* Allocate another symbol to mark where we switch to Arm mode. */
729 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
730 + strlen (CHANGE_TO_ARM
) + 1);
732 BFD_ASSERT (tmp_name
);
734 sprintf (tmp_name
, CHANGE_TO_ARM
, name
);
737 val
= hash_table
->thumb_glue_size
+ 4,
738 _bfd_generic_link_add_one_symbol (link_info
, hash_table
->bfd_of_glue_owner
,
739 tmp_name
, BSF_LOCAL
, s
, val
,
740 NULL
, TRUE
, FALSE
, &bh
);
744 hash_table
->thumb_glue_size
+= THUMB2ARM_GLUE_SIZE
;
749 /* Add the glue sections to ABFD. This function is called from the
750 linker scripts in ld/emultempl/{armelf}.em. */
753 bfd_elf32_arm_add_glue_sections_to_bfd (abfd
, info
)
755 struct bfd_link_info
*info
;
760 /* If we are only performing a partial
761 link do not bother adding the glue. */
762 if (info
->relocatable
)
765 sec
= bfd_get_section_by_name (abfd
, ARM2THUMB_GLUE_SECTION_NAME
);
769 /* Note: we do not include the flag SEC_LINKER_CREATED, as this
770 will prevent elf_link_input_bfd() from processing the contents
772 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_CODE
| SEC_READONLY
;
774 sec
= bfd_make_section (abfd
, ARM2THUMB_GLUE_SECTION_NAME
);
777 || !bfd_set_section_flags (abfd
, sec
, flags
)
778 || !bfd_set_section_alignment (abfd
, sec
, 2))
781 /* Set the gc mark to prevent the section from being removed by garbage
782 collection, despite the fact that no relocs refer to this section. */
786 sec
= bfd_get_section_by_name (abfd
, THUMB2ARM_GLUE_SECTION_NAME
);
790 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_CODE
| SEC_READONLY
;
792 sec
= bfd_make_section (abfd
, THUMB2ARM_GLUE_SECTION_NAME
);
795 || !bfd_set_section_flags (abfd
, sec
, flags
)
796 || !bfd_set_section_alignment (abfd
, sec
, 2))
805 /* Select a BFD to be used to hold the sections used by the glue code.
806 This function is called from the linker scripts in ld/emultempl/
810 bfd_elf32_arm_get_bfd_for_interworking (abfd
, info
)
812 struct bfd_link_info
*info
;
814 struct elf32_arm_link_hash_table
*globals
;
816 /* If we are only performing a partial link
817 do not bother getting a bfd to hold the glue. */
818 if (info
->relocatable
)
821 globals
= elf32_arm_hash_table (info
);
823 BFD_ASSERT (globals
!= NULL
);
825 if (globals
->bfd_of_glue_owner
!= NULL
)
828 /* Save the bfd for later use. */
829 globals
->bfd_of_glue_owner
= abfd
;
835 bfd_elf32_arm_process_before_allocation (abfd
, link_info
,
836 no_pipeline_knowledge
,
839 struct bfd_link_info
*link_info
;
840 int no_pipeline_knowledge
;
843 Elf_Internal_Shdr
*symtab_hdr
;
844 Elf_Internal_Rela
*internal_relocs
= NULL
;
845 Elf_Internal_Rela
*irel
, *irelend
;
846 bfd_byte
*contents
= NULL
;
849 struct elf32_arm_link_hash_table
*globals
;
851 /* If we are only performing a partial link do not bother
852 to construct any glue. */
853 if (link_info
->relocatable
)
856 /* Here we have a bfd that is to be included on the link. We have a hook
857 to do reloc rummaging, before section sizes are nailed down. */
858 globals
= elf32_arm_hash_table (link_info
);
860 BFD_ASSERT (globals
!= NULL
);
861 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
863 globals
->no_pipeline_knowledge
= no_pipeline_knowledge
;
864 if (byteswap_code
&& !bfd_big_endian (abfd
))
867 _("%s: BE8 images only valid in big-endian mode."),
868 bfd_archive_filename (abfd
));
871 globals
->byteswap_code
= byteswap_code
;
873 /* Rummage around all the relocs and map the glue vectors. */
874 sec
= abfd
->sections
;
879 for (; sec
!= NULL
; sec
= sec
->next
)
881 if (sec
->reloc_count
== 0)
884 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
886 /* Load the relocs. */
888 = _bfd_elf_link_read_relocs (abfd
, sec
, (PTR
) NULL
,
889 (Elf_Internal_Rela
*) NULL
, FALSE
);
891 if (internal_relocs
== NULL
)
894 irelend
= internal_relocs
+ sec
->reloc_count
;
895 for (irel
= internal_relocs
; irel
< irelend
; irel
++)
898 unsigned long r_index
;
900 struct elf_link_hash_entry
*h
;
902 r_type
= ELF32_R_TYPE (irel
->r_info
);
903 r_index
= ELF32_R_SYM (irel
->r_info
);
905 /* These are the only relocation types we care about. */
906 if ( r_type
!= R_ARM_PC24
907 && r_type
!= R_ARM_THM_PC22
)
910 /* Get the section contents if we haven't done so already. */
911 if (contents
== NULL
)
913 /* Get cached copy if it exists. */
914 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
915 contents
= elf_section_data (sec
)->this_hdr
.contents
;
918 /* Go get them off disk. */
919 contents
= (bfd_byte
*) bfd_malloc (sec
->_raw_size
);
920 if (contents
== NULL
)
923 if (!bfd_get_section_contents (abfd
, sec
, contents
,
924 (file_ptr
) 0, sec
->_raw_size
))
929 /* If the relocation is not against a symbol it cannot concern us. */
932 /* We don't care about local symbols. */
933 if (r_index
< symtab_hdr
->sh_info
)
936 /* This is an external symbol. */
937 r_index
-= symtab_hdr
->sh_info
;
938 h
= (struct elf_link_hash_entry
*)
939 elf_sym_hashes (abfd
)[r_index
];
941 /* If the relocation is against a static symbol it must be within
942 the current section and so cannot be a cross ARM/Thumb relocation. */
949 /* This one is a call from arm code. We need to look up
950 the target of the call. If it is a thumb target, we
952 if (ELF_ST_TYPE(h
->type
) == STT_ARM_TFUNC
)
953 record_arm_to_thumb_glue (link_info
, h
);
957 /* This one is a call from thumb code. We look
958 up the target of the call. If it is not a thumb
959 target, we insert glue. */
960 if (ELF_ST_TYPE (h
->type
) != STT_ARM_TFUNC
)
961 record_thumb_to_arm_glue (link_info
, h
);
970 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
974 if (internal_relocs
!= NULL
975 && elf_section_data (sec
)->relocs
!= internal_relocs
)
976 free (internal_relocs
);
977 internal_relocs
= NULL
;
984 && elf_section_data (sec
)->this_hdr
.contents
!= contents
)
986 if (internal_relocs
!= NULL
987 && elf_section_data (sec
)->relocs
!= internal_relocs
)
988 free (internal_relocs
);
994 /* The thumb form of a long branch is a bit finicky, because the offset
995 encoding is split over two fields, each in it's own instruction. They
996 can occur in any order. So given a thumb form of long branch, and an
997 offset, insert the offset into the thumb branch and return finished
1000 It takes two thumb instructions to encode the target address. Each has
1001 11 bits to invest. The upper 11 bits are stored in one (identified by
1002 H-0.. see below), the lower 11 bits are stored in the other (identified
1005 Combine together and shifted left by 1 (it's a half word address) and
1009 H-0, upper address-0 = 000
1011 H-1, lower address-0 = 800
1013 They can be ordered either way, but the arm tools I've seen always put
1014 the lower one first. It probably doesn't matter. krk@cygnus.com
1016 XXX: Actually the order does matter. The second instruction (H-1)
1017 moves the computed address into the PC, so it must be the second one
1018 in the sequence. The problem, however is that whilst little endian code
1019 stores the instructions in HI then LOW order, big endian code does the
1020 reverse. nickc@cygnus.com. */
1022 #define LOW_HI_ORDER 0xF800F000
1023 #define HI_LOW_ORDER 0xF000F800
1026 insert_thumb_branch (br_insn
, rel_off
)
1030 unsigned int low_bits
;
1031 unsigned int high_bits
;
1033 BFD_ASSERT ((rel_off
& 1) != 1);
1035 rel_off
>>= 1; /* Half word aligned address. */
1036 low_bits
= rel_off
& 0x000007FF; /* The bottom 11 bits. */
1037 high_bits
= (rel_off
>> 11) & 0x000007FF; /* The top 11 bits. */
1039 if ((br_insn
& LOW_HI_ORDER
) == LOW_HI_ORDER
)
1040 br_insn
= LOW_HI_ORDER
| (low_bits
<< 16) | high_bits
;
1041 else if ((br_insn
& HI_LOW_ORDER
) == HI_LOW_ORDER
)
1042 br_insn
= HI_LOW_ORDER
| (high_bits
<< 16) | low_bits
;
1044 /* FIXME: abort is probably not the right call. krk@cygnus.com */
1045 abort (); /* error - not a valid branch instruction form. */
1050 /* Thumb code calling an ARM function. */
1053 elf32_thumb_to_arm_stub (info
, name
, input_bfd
, output_bfd
, input_section
,
1054 hit_data
, sym_sec
, offset
, addend
, val
)
1055 struct bfd_link_info
* info
;
1059 asection
* input_section
;
1060 bfd_byte
* hit_data
;
1063 bfd_signed_vma addend
;
1068 unsigned long int tmp
;
1069 long int ret_offset
;
1070 struct elf_link_hash_entry
* myh
;
1071 struct elf32_arm_link_hash_table
* globals
;
1073 myh
= find_thumb_glue (info
, name
, input_bfd
);
1077 globals
= elf32_arm_hash_table (info
);
1079 BFD_ASSERT (globals
!= NULL
);
1080 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
1082 my_offset
= myh
->root
.u
.def
.value
;
1084 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
1085 THUMB2ARM_GLUE_SECTION_NAME
);
1087 BFD_ASSERT (s
!= NULL
);
1088 BFD_ASSERT (s
->contents
!= NULL
);
1089 BFD_ASSERT (s
->output_section
!= NULL
);
1091 if ((my_offset
& 0x01) == 0x01)
1094 && sym_sec
->owner
!= NULL
1095 && !INTERWORK_FLAG (sym_sec
->owner
))
1097 (*_bfd_error_handler
)
1098 (_("%s(%s): warning: interworking not enabled."),
1099 bfd_archive_filename (sym_sec
->owner
), name
);
1100 (*_bfd_error_handler
)
1101 (_(" first occurrence: %s: thumb call to arm"),
1102 bfd_archive_filename (input_bfd
));
1108 myh
->root
.u
.def
.value
= my_offset
;
1110 bfd_put_16 (output_bfd
, (bfd_vma
) t2a1_bx_pc_insn
,
1111 s
->contents
+ my_offset
);
1113 bfd_put_16 (output_bfd
, (bfd_vma
) t2a2_noop_insn
,
1114 s
->contents
+ my_offset
+ 2);
1117 /* Address of destination of the stub. */
1118 ((bfd_signed_vma
) val
)
1120 /* Offset from the start of the current section to the start of the stubs. */
1122 /* Offset of the start of this stub from the start of the stubs. */
1124 /* Address of the start of the current section. */
1125 + s
->output_section
->vma
)
1126 /* The branch instruction is 4 bytes into the stub. */
1128 /* ARM branches work from the pc of the instruction + 8. */
1131 bfd_put_32 (output_bfd
,
1132 (bfd_vma
) t2a3_b_insn
| ((ret_offset
>> 2) & 0x00FFFFFF),
1133 s
->contents
+ my_offset
+ 4);
1136 BFD_ASSERT (my_offset
<= globals
->thumb_glue_size
);
1138 /* Now go back and fix up the original BL insn to point to here. */
1140 /* Address of where the stub is located. */
1141 (s
->output_section
->vma
+ s
->output_offset
+ my_offset
)
1142 /* Address of where the BL is located. */
1143 - (input_section
->output_section
->vma
+ input_section
->output_offset
+ offset
)
1144 /* Addend in the relocation. */
1146 /* Biassing for PC-relative addressing. */
1149 tmp
= bfd_get_32 (input_bfd
, hit_data
1150 - input_section
->vma
);
1152 bfd_put_32 (output_bfd
,
1153 (bfd_vma
) insert_thumb_branch (tmp
, ret_offset
),
1154 hit_data
- input_section
->vma
);
1159 /* Arm code calling a Thumb function. */
1162 elf32_arm_to_thumb_stub (info
, name
, input_bfd
, output_bfd
, input_section
,
1163 hit_data
, sym_sec
, offset
, addend
, val
)
1164 struct bfd_link_info
* info
;
1168 asection
* input_section
;
1169 bfd_byte
* hit_data
;
1172 bfd_signed_vma addend
;
1175 unsigned long int tmp
;
1178 long int ret_offset
;
1179 struct elf_link_hash_entry
* myh
;
1180 struct elf32_arm_link_hash_table
* globals
;
1182 myh
= find_arm_glue (info
, name
, input_bfd
);
1186 globals
= elf32_arm_hash_table (info
);
1188 BFD_ASSERT (globals
!= NULL
);
1189 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
1191 my_offset
= myh
->root
.u
.def
.value
;
1192 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
1193 ARM2THUMB_GLUE_SECTION_NAME
);
1194 BFD_ASSERT (s
!= NULL
);
1195 BFD_ASSERT (s
->contents
!= NULL
);
1196 BFD_ASSERT (s
->output_section
!= NULL
);
1198 if ((my_offset
& 0x01) == 0x01)
1201 && sym_sec
->owner
!= NULL
1202 && !INTERWORK_FLAG (sym_sec
->owner
))
1204 (*_bfd_error_handler
)
1205 (_("%s(%s): warning: interworking not enabled."),
1206 bfd_archive_filename (sym_sec
->owner
), name
);
1207 (*_bfd_error_handler
)
1208 (_(" first occurrence: %s: arm call to thumb"),
1209 bfd_archive_filename (input_bfd
));
1213 myh
->root
.u
.def
.value
= my_offset
;
1215 bfd_put_32 (output_bfd
, (bfd_vma
) a2t1_ldr_insn
,
1216 s
->contents
+ my_offset
);
1218 bfd_put_32 (output_bfd
, (bfd_vma
) a2t2_bx_r12_insn
,
1219 s
->contents
+ my_offset
+ 4);
1221 /* It's a thumb address. Add the low order bit. */
1222 bfd_put_32 (output_bfd
, val
| a2t3_func_addr_insn
,
1223 s
->contents
+ my_offset
+ 8);
1226 BFD_ASSERT (my_offset
<= globals
->arm_glue_size
);
1228 tmp
= bfd_get_32 (input_bfd
, hit_data
);
1229 tmp
= tmp
& 0xFF000000;
1231 /* Somehow these are both 4 too far, so subtract 8. */
1232 ret_offset
= (s
->output_offset
1234 + s
->output_section
->vma
1235 - (input_section
->output_offset
1236 + input_section
->output_section
->vma
1240 tmp
= tmp
| ((ret_offset
>> 2) & 0x00FFFFFF);
1242 bfd_put_32 (output_bfd
, (bfd_vma
) tmp
, hit_data
- input_section
->vma
);
1247 /* Perform a relocation as part of a final link. */
1249 static bfd_reloc_status_type
1250 elf32_arm_final_link_relocate (howto
, input_bfd
, output_bfd
,
1251 input_section
, contents
, rel
, value
,
1252 info
, sym_sec
, sym_name
, sym_flags
, h
)
1253 reloc_howto_type
* howto
;
1256 asection
* input_section
;
1257 bfd_byte
* contents
;
1258 Elf_Internal_Rela
* rel
;
1260 struct bfd_link_info
* info
;
1262 const char * sym_name
;
1264 struct elf_link_hash_entry
* h
;
1266 unsigned long r_type
= howto
->type
;
1267 unsigned long r_symndx
;
1268 bfd_byte
* hit_data
= contents
+ rel
->r_offset
;
1269 bfd
* dynobj
= NULL
;
1270 Elf_Internal_Shdr
* symtab_hdr
;
1271 struct elf_link_hash_entry
** sym_hashes
;
1272 bfd_vma
* local_got_offsets
;
1273 asection
* sgot
= NULL
;
1274 asection
* splt
= NULL
;
1275 asection
* sreloc
= NULL
;
1277 bfd_signed_vma signed_addend
;
1278 struct elf32_arm_link_hash_table
* globals
;
1280 /* If the start address has been set, then set the EF_ARM_HASENTRY
1281 flag. Setting this more than once is redundant, but the cost is
1282 not too high, and it keeps the code simple.
1284 The test is done here, rather than somewhere else, because the
1285 start address is only set just before the final link commences.
1287 Note - if the user deliberately sets a start address of 0, the
1288 flag will not be set. */
1289 if (bfd_get_start_address (output_bfd
) != 0)
1290 elf_elfheader (output_bfd
)->e_flags
|= EF_ARM_HASENTRY
;
1292 globals
= elf32_arm_hash_table (info
);
1294 dynobj
= elf_hash_table (info
)->dynobj
;
1297 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1298 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1300 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1301 sym_hashes
= elf_sym_hashes (input_bfd
);
1302 local_got_offsets
= elf_local_got_offsets (input_bfd
);
1303 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1306 addend
= bfd_get_32 (input_bfd
, hit_data
) & howto
->src_mask
;
1308 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1311 signed_addend
&= ~ howto
->src_mask
;
1312 signed_addend
|= addend
;
1315 signed_addend
= addend
;
1317 addend
= signed_addend
= rel
->r_addend
;
1323 return bfd_reloc_ok
;
1332 /* r_symndx will be zero only for relocs against symbols
1333 from removed linkonce sections, or sections discarded by
1336 return bfd_reloc_ok
;
1338 /* Handle relocations which should use the PLT entry. ABS32/REL32
1339 will use the symbol's value, which may point to a PLT entry, but we
1340 don't need to handle that here. If we created a PLT entry, all
1341 branches in this object should go to it. */
1342 if ((r_type
!= R_ARM_ABS32
&& r_type
!= R_ARM_REL32
)
1345 && h
->plt
.offset
!= (bfd_vma
) -1)
1347 /* If we've created a .plt section, and assigned a PLT entry to
1348 this function, it should not be known to bind locally. If
1349 it were, we would have cleared the PLT entry. */
1350 BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info
, h
));
1352 value
= (splt
->output_section
->vma
1353 + splt
->output_offset
1355 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1356 contents
, rel
->r_offset
, value
,
1360 /* When generating a shared object, these relocations are copied
1361 into the output file to be resolved at run time. */
1363 && (input_section
->flags
& SEC_ALLOC
)
1365 || ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
1366 || h
->root
.type
!= bfd_link_hash_undefweak
)
1367 && r_type
!= R_ARM_PC24
1368 && r_type
!= R_ARM_PLT32
)
1370 Elf_Internal_Rela outrel
;
1372 bfd_boolean skip
, relocate
;
1378 name
= (bfd_elf_string_from_elf_section
1380 elf_elfheader (input_bfd
)->e_shstrndx
,
1381 elf_section_data (input_section
)->rel_hdr
.sh_name
));
1383 return bfd_reloc_notsupported
;
1385 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
1386 && strcmp (bfd_get_section_name (input_bfd
,
1390 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1391 BFD_ASSERT (sreloc
!= NULL
);
1398 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
1400 if (outrel
.r_offset
== (bfd_vma
) -1)
1402 else if (outrel
.r_offset
== (bfd_vma
) -2)
1403 skip
= TRUE
, relocate
= TRUE
;
1404 outrel
.r_offset
+= (input_section
->output_section
->vma
1405 + input_section
->output_offset
);
1408 memset (&outrel
, 0, sizeof outrel
);
1413 || (h
->elf_link_hash_flags
1414 & ELF_LINK_HASH_DEF_REGULAR
) == 0))
1415 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, r_type
);
1418 /* This symbol is local, or marked to become local. */
1420 outrel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
1423 loc
= sreloc
->contents
;
1424 loc
+= sreloc
->reloc_count
++ * sizeof (Elf32_External_Rel
);
1425 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
1427 /* If this reloc is against an external symbol, we do not want to
1428 fiddle with the addend. Otherwise, we need to include the symbol
1429 value so that it becomes an addend for the dynamic reloc. */
1431 return bfd_reloc_ok
;
1433 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1434 contents
, rel
->r_offset
, value
,
1437 else switch (r_type
)
1440 case R_ARM_XPC25
: /* Arm BLX instruction. */
1442 case R_ARM_PC24
: /* Arm B/BL instruction */
1445 if (r_type
== R_ARM_XPC25
)
1447 /* Check for Arm calling Arm function. */
1448 /* FIXME: Should we translate the instruction into a BL
1449 instruction instead ? */
1450 if (sym_flags
!= STT_ARM_TFUNC
)
1451 (*_bfd_error_handler
) (_("\
1452 %s: Warning: Arm BLX instruction targets Arm function '%s'."),
1453 bfd_archive_filename (input_bfd
),
1454 h
? h
->root
.root
.string
: "(local)");
1459 /* Check for Arm calling Thumb function. */
1460 if (sym_flags
== STT_ARM_TFUNC
)
1462 elf32_arm_to_thumb_stub (info
, sym_name
, input_bfd
, output_bfd
,
1463 input_section
, hit_data
, sym_sec
, rel
->r_offset
,
1464 signed_addend
, value
);
1465 return bfd_reloc_ok
;
1469 if ( strcmp (bfd_get_target (input_bfd
), "elf32-littlearm-oabi") == 0
1470 || strcmp (bfd_get_target (input_bfd
), "elf32-bigarm-oabi") == 0)
1472 /* The old way of doing things. Trearing the addend as a
1473 byte sized field and adding in the pipeline offset. */
1474 value
-= (input_section
->output_section
->vma
1475 + input_section
->output_offset
);
1476 value
-= rel
->r_offset
;
1479 if (! globals
->no_pipeline_knowledge
)
1484 /* The ARM ELF ABI says that this reloc is computed as: S - P + A
1486 S is the address of the symbol in the relocation.
1487 P is address of the instruction being relocated.
1488 A is the addend (extracted from the instruction) in bytes.
1490 S is held in 'value'.
1491 P is the base address of the section containing the instruction
1492 plus the offset of the reloc into that section, ie:
1493 (input_section->output_section->vma +
1494 input_section->output_offset +
1496 A is the addend, converted into bytes, ie:
1499 Note: None of these operations have knowledge of the pipeline
1500 size of the processor, thus it is up to the assembler to encode
1501 this information into the addend. */
1502 value
-= (input_section
->output_section
->vma
1503 + input_section
->output_offset
);
1504 value
-= rel
->r_offset
;
1505 value
+= (signed_addend
<< howto
->size
);
1507 /* Previous versions of this code also used to add in the pipeline
1508 offset here. This is wrong because the linker is not supposed
1509 to know about such things, and one day it might change. In order
1510 to support old binaries that need the old behaviour however, so
1511 we attempt to detect which ABI was used to create the reloc. */
1512 if (! globals
->no_pipeline_knowledge
)
1514 Elf_Internal_Ehdr
* i_ehdrp
; /* Elf file header, internal form */
1516 i_ehdrp
= elf_elfheader (input_bfd
);
1518 if (i_ehdrp
->e_ident
[EI_OSABI
] == 0)
1523 signed_addend
= value
;
1524 signed_addend
>>= howto
->rightshift
;
1526 /* It is not an error for an undefined weak reference to be
1527 out of range. Any program that branches to such a symbol
1528 is going to crash anyway, so there is no point worrying
1529 about getting the destination exactly right. */
1530 if (! h
|| h
->root
.type
!= bfd_link_hash_undefweak
)
1532 /* Perform a signed range check. */
1533 if ( signed_addend
> ((bfd_signed_vma
) (howto
->dst_mask
>> 1))
1534 || signed_addend
< - ((bfd_signed_vma
) ((howto
->dst_mask
+ 1) >> 1)))
1535 return bfd_reloc_overflow
;
1539 /* If necessary set the H bit in the BLX instruction. */
1540 if (r_type
== R_ARM_XPC25
&& ((value
& 2) == 2))
1541 value
= (signed_addend
& howto
->dst_mask
)
1542 | (bfd_get_32 (input_bfd
, hit_data
) & (~ howto
->dst_mask
))
1546 value
= (signed_addend
& howto
->dst_mask
)
1547 | (bfd_get_32 (input_bfd
, hit_data
) & (~ howto
->dst_mask
));
1552 if (sym_flags
== STT_ARM_TFUNC
)
1557 value
-= (input_section
->output_section
->vma
1558 + input_section
->output_offset
+ rel
->r_offset
);
1563 bfd_put_32 (input_bfd
, value
, hit_data
);
1564 return bfd_reloc_ok
;
1568 if ((long) value
> 0x7f || (long) value
< -0x80)
1569 return bfd_reloc_overflow
;
1571 bfd_put_8 (input_bfd
, value
, hit_data
);
1572 return bfd_reloc_ok
;
1577 if ((long) value
> 0x7fff || (long) value
< -0x8000)
1578 return bfd_reloc_overflow
;
1580 bfd_put_16 (input_bfd
, value
, hit_data
);
1581 return bfd_reloc_ok
;
1584 /* Support ldr and str instruction for the arm */
1585 /* Also thumb b (unconditional branch). ??? Really? */
1588 if ((long) value
> 0x7ff || (long) value
< -0x800)
1589 return bfd_reloc_overflow
;
1591 value
|= (bfd_get_32 (input_bfd
, hit_data
) & 0xfffff000);
1592 bfd_put_32 (input_bfd
, value
, hit_data
);
1593 return bfd_reloc_ok
;
1595 case R_ARM_THM_ABS5
:
1596 /* Support ldr and str instructions for the thumb. */
1598 /* Need to refetch addend. */
1599 addend
= bfd_get_16 (input_bfd
, hit_data
) & howto
->src_mask
;
1600 /* ??? Need to determine shift amount from operand size. */
1601 addend
>>= howto
->rightshift
;
1605 /* ??? Isn't value unsigned? */
1606 if ((long) value
> 0x1f || (long) value
< -0x10)
1607 return bfd_reloc_overflow
;
1609 /* ??? Value needs to be properly shifted into place first. */
1610 value
|= bfd_get_16 (input_bfd
, hit_data
) & 0xf83f;
1611 bfd_put_16 (input_bfd
, value
, hit_data
);
1612 return bfd_reloc_ok
;
1615 case R_ARM_THM_XPC22
:
1617 case R_ARM_THM_PC22
:
1618 /* Thumb BL (branch long instruction). */
1621 bfd_boolean overflow
= FALSE
;
1622 bfd_vma upper_insn
= bfd_get_16 (input_bfd
, hit_data
);
1623 bfd_vma lower_insn
= bfd_get_16 (input_bfd
, hit_data
+ 2);
1624 bfd_signed_vma reloc_signed_max
= ((1 << (howto
->bitsize
- 1)) - 1) >> howto
->rightshift
;
1625 bfd_signed_vma reloc_signed_min
= ~ reloc_signed_max
;
1627 bfd_signed_vma signed_check
;
1630 /* Need to refetch the addend and squish the two 11 bit pieces
1633 bfd_vma upper
= upper_insn
& 0x7ff;
1634 bfd_vma lower
= lower_insn
& 0x7ff;
1635 upper
= (upper
^ 0x400) - 0x400; /* Sign extend. */
1636 addend
= (upper
<< 12) | (lower
<< 1);
1637 signed_addend
= addend
;
1641 if (r_type
== R_ARM_THM_XPC22
)
1643 /* Check for Thumb to Thumb call. */
1644 /* FIXME: Should we translate the instruction into a BL
1645 instruction instead ? */
1646 if (sym_flags
== STT_ARM_TFUNC
)
1647 (*_bfd_error_handler
) (_("\
1648 %s: Warning: Thumb BLX instruction targets thumb function '%s'."),
1649 bfd_archive_filename (input_bfd
),
1650 h
? h
->root
.root
.string
: "(local)");
1655 /* If it is not a call to Thumb, assume call to Arm.
1656 If it is a call relative to a section name, then it is not a
1657 function call at all, but rather a long jump. */
1658 if (sym_flags
!= STT_ARM_TFUNC
&& sym_flags
!= STT_SECTION
)
1660 if (elf32_thumb_to_arm_stub
1661 (info
, sym_name
, input_bfd
, output_bfd
, input_section
,
1662 hit_data
, sym_sec
, rel
->r_offset
, signed_addend
, value
))
1663 return bfd_reloc_ok
;
1665 return bfd_reloc_dangerous
;
1669 relocation
= value
+ signed_addend
;
1671 relocation
-= (input_section
->output_section
->vma
1672 + input_section
->output_offset
1675 if (! globals
->no_pipeline_knowledge
)
1677 Elf_Internal_Ehdr
* i_ehdrp
; /* Elf file header, internal form. */
1679 i_ehdrp
= elf_elfheader (input_bfd
);
1681 /* Previous versions of this code also used to add in the pipline
1682 offset here. This is wrong because the linker is not supposed
1683 to know about such things, and one day it might change. In order
1684 to support old binaries that need the old behaviour however, so
1685 we attempt to detect which ABI was used to create the reloc. */
1686 if ( strcmp (bfd_get_target (input_bfd
), "elf32-littlearm-oabi") == 0
1687 || strcmp (bfd_get_target (input_bfd
), "elf32-bigarm-oabi") == 0
1688 || i_ehdrp
->e_ident
[EI_OSABI
] == 0)
1692 check
= relocation
>> howto
->rightshift
;
1694 /* If this is a signed value, the rightshift just dropped
1695 leading 1 bits (assuming twos complement). */
1696 if ((bfd_signed_vma
) relocation
>= 0)
1697 signed_check
= check
;
1699 signed_check
= check
| ~((bfd_vma
) -1 >> howto
->rightshift
);
1701 /* Assumes two's complement. */
1702 if (signed_check
> reloc_signed_max
|| signed_check
< reloc_signed_min
)
1706 if (r_type
== R_ARM_THM_XPC22
1707 && ((lower_insn
& 0x1800) == 0x0800))
1708 /* For a BLX instruction, make sure that the relocation is rounded up
1709 to a word boundary. This follows the semantics of the instruction
1710 which specifies that bit 1 of the target address will come from bit
1711 1 of the base address. */
1712 relocation
= (relocation
+ 2) & ~ 3;
1714 /* Put RELOCATION back into the insn. */
1715 upper_insn
= (upper_insn
& ~(bfd_vma
) 0x7ff) | ((relocation
>> 12) & 0x7ff);
1716 lower_insn
= (lower_insn
& ~(bfd_vma
) 0x7ff) | ((relocation
>> 1) & 0x7ff);
1718 /* Put the relocated value back in the object file: */
1719 bfd_put_16 (input_bfd
, upper_insn
, hit_data
);
1720 bfd_put_16 (input_bfd
, lower_insn
, hit_data
+ 2);
1722 return (overflow
? bfd_reloc_overflow
: bfd_reloc_ok
);
1726 case R_ARM_THM_PC11
:
1727 /* Thumb B (branch) instruction). */
1729 bfd_signed_vma relocation
;
1730 bfd_signed_vma reloc_signed_max
= (1 << (howto
->bitsize
- 1)) - 1;
1731 bfd_signed_vma reloc_signed_min
= ~ reloc_signed_max
;
1732 bfd_signed_vma signed_check
;
1735 /* Need to refetch addend. */
1736 addend
= bfd_get_16 (input_bfd
, hit_data
) & howto
->src_mask
;
1737 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1740 signed_addend
&= ~ howto
->src_mask
;
1741 signed_addend
|= addend
;
1744 signed_addend
= addend
;
1745 /* The value in the insn has been right shifted. We need to
1746 undo this, so that we can perform the address calculation
1747 in terms of bytes. */
1748 signed_addend
<<= howto
->rightshift
;
1750 relocation
= value
+ signed_addend
;
1752 relocation
-= (input_section
->output_section
->vma
1753 + input_section
->output_offset
1756 relocation
>>= howto
->rightshift
;
1757 signed_check
= relocation
;
1758 relocation
&= howto
->dst_mask
;
1759 relocation
|= (bfd_get_16 (input_bfd
, hit_data
) & (~ howto
->dst_mask
));
1761 bfd_put_16 (input_bfd
, relocation
, hit_data
);
1763 /* Assumes two's complement. */
1764 if (signed_check
> reloc_signed_max
|| signed_check
< reloc_signed_min
)
1765 return bfd_reloc_overflow
;
1767 return bfd_reloc_ok
;
1770 case R_ARM_ALU_PCREL7_0
:
1771 case R_ARM_ALU_PCREL15_8
:
1772 case R_ARM_ALU_PCREL23_15
:
1777 insn
= bfd_get_32 (input_bfd
, hit_data
);
1779 /* Extract the addend. */
1780 addend
= (insn
& 0xff) << ((insn
& 0xf00) >> 7);
1781 signed_addend
= addend
;
1783 relocation
= value
+ signed_addend
;
1785 relocation
-= (input_section
->output_section
->vma
1786 + input_section
->output_offset
1788 insn
= (insn
& ~0xfff)
1789 | ((howto
->bitpos
<< 7) & 0xf00)
1790 | ((relocation
>> howto
->bitpos
) & 0xff);
1791 bfd_put_32 (input_bfd
, value
, hit_data
);
1793 return bfd_reloc_ok
;
1795 case R_ARM_GNU_VTINHERIT
:
1796 case R_ARM_GNU_VTENTRY
:
1797 return bfd_reloc_ok
;
1800 return bfd_reloc_notsupported
;
1802 case R_ARM_GLOB_DAT
:
1803 return bfd_reloc_notsupported
;
1805 case R_ARM_JUMP_SLOT
:
1806 return bfd_reloc_notsupported
;
1808 case R_ARM_RELATIVE
:
1809 return bfd_reloc_notsupported
;
1812 /* Relocation is relative to the start of the
1813 global offset table. */
1815 BFD_ASSERT (sgot
!= NULL
);
1817 return bfd_reloc_notsupported
;
1819 /* If we are addressing a Thumb function, we need to adjust the
1820 address by one, so that attempts to call the function pointer will
1821 correctly interpret it as Thumb code. */
1822 if (sym_flags
== STT_ARM_TFUNC
)
1825 /* Note that sgot->output_offset is not involved in this
1826 calculation. We always want the start of .got. If we
1827 define _GLOBAL_OFFSET_TABLE in a different way, as is
1828 permitted by the ABI, we might have to change this
1830 value
-= sgot
->output_section
->vma
;
1831 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1832 contents
, rel
->r_offset
, value
,
1836 /* Use global offset table as symbol value. */
1837 BFD_ASSERT (sgot
!= NULL
);
1840 return bfd_reloc_notsupported
;
1842 value
= sgot
->output_section
->vma
;
1843 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1844 contents
, rel
->r_offset
, value
,
1848 /* Relocation is to the entry for this symbol in the
1849 global offset table. */
1851 return bfd_reloc_notsupported
;
1858 off
= h
->got
.offset
;
1859 BFD_ASSERT (off
!= (bfd_vma
) -1);
1860 dyn
= globals
->root
.dynamic_sections_created
;
1862 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, info
->shared
, h
)
1864 && SYMBOL_REFERENCES_LOCAL (info
, h
))
1865 || (ELF_ST_VISIBILITY (h
->other
)
1866 && h
->root
.type
== bfd_link_hash_undefweak
))
1868 /* This is actually a static link, or it is a -Bsymbolic link
1869 and the symbol is defined locally. We must initialize this
1870 entry in the global offset table. Since the offset must
1871 always be a multiple of 4, we use the least significant bit
1872 to record whether we have initialized it already.
1874 When doing a dynamic link, we create a .rel.got relocation
1875 entry to initialize the value. This is done in the
1876 finish_dynamic_symbol routine. */
1881 /* If we are addressing a Thumb function, we need to
1882 adjust the address by one, so that attempts to
1883 call the function pointer will correctly
1884 interpret it as Thumb code. */
1885 if (sym_flags
== STT_ARM_TFUNC
)
1888 bfd_put_32 (output_bfd
, value
, sgot
->contents
+ off
);
1893 value
= sgot
->output_offset
+ off
;
1899 BFD_ASSERT (local_got_offsets
!= NULL
&&
1900 local_got_offsets
[r_symndx
] != (bfd_vma
) -1);
1902 off
= local_got_offsets
[r_symndx
];
1904 /* The offset must always be a multiple of 4. We use the
1905 least significant bit to record whether we have already
1906 generated the necessary reloc. */
1911 bfd_put_32 (output_bfd
, value
, sgot
->contents
+ off
);
1916 Elf_Internal_Rela outrel
;
1919 srelgot
= bfd_get_section_by_name (dynobj
, ".rel.got");
1920 BFD_ASSERT (srelgot
!= NULL
);
1922 outrel
.r_offset
= (sgot
->output_section
->vma
1923 + sgot
->output_offset
1925 outrel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
1926 loc
= srelgot
->contents
;
1927 loc
+= srelgot
->reloc_count
++ * sizeof (Elf32_External_Rel
);
1928 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
, loc
);
1931 local_got_offsets
[r_symndx
] |= 1;
1934 value
= sgot
->output_offset
+ off
;
1937 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1938 contents
, rel
->r_offset
, value
,
1942 return bfd_reloc_notsupported
;
1944 case R_ARM_AMP_VCALL9
:
1945 return bfd_reloc_notsupported
;
1947 case R_ARM_RSBREL32
:
1948 return bfd_reloc_notsupported
;
1950 case R_ARM_THM_RPC22
:
1951 return bfd_reloc_notsupported
;
1954 return bfd_reloc_notsupported
;
1957 return bfd_reloc_notsupported
;
1960 return bfd_reloc_notsupported
;
1963 return bfd_reloc_notsupported
;
1966 return bfd_reloc_notsupported
;
1971 /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */
1973 arm_add_to_rel (abfd
, address
, howto
, increment
)
1976 reloc_howto_type
* howto
;
1977 bfd_signed_vma increment
;
1979 bfd_signed_vma addend
;
1981 if (howto
->type
== R_ARM_THM_PC22
)
1983 int upper_insn
, lower_insn
;
1986 upper_insn
= bfd_get_16 (abfd
, address
);
1987 lower_insn
= bfd_get_16 (abfd
, address
+ 2);
1988 upper
= upper_insn
& 0x7ff;
1989 lower
= lower_insn
& 0x7ff;
1991 addend
= (upper
<< 12) | (lower
<< 1);
1992 addend
+= increment
;
1995 upper_insn
= (upper_insn
& 0xf800) | ((addend
>> 11) & 0x7ff);
1996 lower_insn
= (lower_insn
& 0xf800) | (addend
& 0x7ff);
1998 bfd_put_16 (abfd
, (bfd_vma
) upper_insn
, address
);
1999 bfd_put_16 (abfd
, (bfd_vma
) lower_insn
, address
+ 2);
2005 contents
= bfd_get_32 (abfd
, address
);
2007 /* Get the (signed) value from the instruction. */
2008 addend
= contents
& howto
->src_mask
;
2009 if (addend
& ((howto
->src_mask
+ 1) >> 1))
2011 bfd_signed_vma mask
;
2014 mask
&= ~ howto
->src_mask
;
2018 /* Add in the increment, (which is a byte value). */
2019 switch (howto
->type
)
2022 addend
+= increment
;
2026 addend
<<= howto
->size
;
2027 addend
+= increment
;
2029 /* Should we check for overflow here ? */
2031 /* Drop any undesired bits. */
2032 addend
>>= howto
->rightshift
;
2036 contents
= (contents
& ~ howto
->dst_mask
) | (addend
& howto
->dst_mask
);
2038 bfd_put_32 (abfd
, contents
, address
);
2041 #endif /* USE_REL */
2043 /* Relocate an ARM ELF section. */
2045 elf32_arm_relocate_section (output_bfd
, info
, input_bfd
, input_section
,
2046 contents
, relocs
, local_syms
, local_sections
)
2048 struct bfd_link_info
*info
;
2050 asection
*input_section
;
2052 Elf_Internal_Rela
*relocs
;
2053 Elf_Internal_Sym
*local_syms
;
2054 asection
**local_sections
;
2056 Elf_Internal_Shdr
*symtab_hdr
;
2057 struct elf_link_hash_entry
**sym_hashes
;
2058 Elf_Internal_Rela
*rel
;
2059 Elf_Internal_Rela
*relend
;
2063 if (info
->relocatable
)
2067 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
2068 sym_hashes
= elf_sym_hashes (input_bfd
);
2071 relend
= relocs
+ input_section
->reloc_count
;
2072 for (; rel
< relend
; rel
++)
2075 reloc_howto_type
* howto
;
2076 unsigned long r_symndx
;
2077 Elf_Internal_Sym
* sym
;
2079 struct elf_link_hash_entry
* h
;
2081 bfd_reloc_status_type r
;
2084 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2085 r_type
= ELF32_R_TYPE (rel
->r_info
);
2087 if ( r_type
== R_ARM_GNU_VTENTRY
2088 || r_type
== R_ARM_GNU_VTINHERIT
)
2091 elf32_arm_info_to_howto (input_bfd
, & bfd_reloc
, rel
);
2092 howto
= bfd_reloc
.howto
;
2095 if (info
->relocatable
)
2097 /* This is a relocatable link. We don't have to change
2098 anything, unless the reloc is against a section symbol,
2099 in which case we have to adjust according to where the
2100 section symbol winds up in the output section. */
2101 if (r_symndx
< symtab_hdr
->sh_info
)
2103 sym
= local_syms
+ r_symndx
;
2104 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2106 sec
= local_sections
[r_symndx
];
2107 arm_add_to_rel (input_bfd
, contents
+ rel
->r_offset
,
2109 (bfd_signed_vma
) (sec
->output_offset
2118 /* This is a final link. */
2123 if (r_symndx
< symtab_hdr
->sh_info
)
2125 sym
= local_syms
+ r_symndx
;
2126 sec
= local_sections
[r_symndx
];
2128 relocation
= (sec
->output_section
->vma
2129 + sec
->output_offset
2131 if ((sec
->flags
& SEC_MERGE
)
2132 && ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2135 bfd_vma addend
, value
;
2137 if (howto
->rightshift
)
2139 (*_bfd_error_handler
)
2140 (_("%s(%s+0x%lx): %s relocation against SEC_MERGE section"),
2141 bfd_archive_filename (input_bfd
),
2142 bfd_get_section_name (input_bfd
, input_section
),
2143 (long) rel
->r_offset
, howto
->name
);
2147 value
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2149 /* Get the (signed) value from the instruction. */
2150 addend
= value
& howto
->src_mask
;
2151 if (addend
& ((howto
->src_mask
+ 1) >> 1))
2153 bfd_signed_vma mask
;
2156 mask
&= ~ howto
->src_mask
;
2161 _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
, addend
)
2163 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
2164 value
= (value
& ~ howto
->dst_mask
) | (addend
& howto
->dst_mask
);
2165 bfd_put_32 (input_bfd
, value
, contents
+ rel
->r_offset
);
2168 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2174 bfd_boolean unresolved_reloc
;
2176 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2177 r_symndx
, symtab_hdr
, sym_hashes
,
2179 unresolved_reloc
, warned
);
2181 if (unresolved_reloc
|| relocation
!= 0)
2183 /* In these cases, we don't need the relocation value.
2184 We check specially because in some obscure cases
2185 sec->output_section will be NULL. */
2190 case R_ARM_THM_PC22
:
2193 (!info
->symbolic
&& h
->dynindx
!= -1)
2194 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2196 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2197 && ((input_section
->flags
& SEC_ALLOC
) != 0
2198 /* DWARF will emit R_ARM_ABS32 relocations in its
2199 sections against symbols defined externally
2200 in shared libraries. We can't do anything
2202 || ((input_section
->flags
& SEC_DEBUGGING
) != 0
2203 && (h
->elf_link_hash_flags
2204 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0))
2214 if ((WILL_CALL_FINISH_DYNAMIC_SYMBOL
2215 (elf_hash_table (info
)->dynamic_sections_created
,
2218 || (!info
->symbolic
&& h
->dynindx
!= -1)
2219 || (h
->elf_link_hash_flags
2220 & ELF_LINK_HASH_DEF_REGULAR
) == 0))
2225 if (h
->plt
.offset
!= (bfd_vma
)-1)
2230 if (unresolved_reloc
)
2232 (_("%s: warning: unresolvable relocation %d against symbol `%s' from %s section"),
2233 bfd_archive_filename (input_bfd
),
2235 h
->root
.root
.string
,
2236 bfd_get_section_name (input_bfd
, input_section
));
2243 name
= h
->root
.root
.string
;
2246 name
= (bfd_elf_string_from_elf_section
2247 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
));
2248 if (name
== NULL
|| *name
== '\0')
2249 name
= bfd_section_name (input_bfd
, sec
);
2252 r
= elf32_arm_final_link_relocate (howto
, input_bfd
, output_bfd
,
2253 input_section
, contents
, rel
,
2254 relocation
, info
, sec
, name
,
2255 (h
? ELF_ST_TYPE (h
->type
) :
2256 ELF_ST_TYPE (sym
->st_info
)), h
);
2258 if (r
!= bfd_reloc_ok
)
2260 const char * msg
= (const char *) 0;
2264 case bfd_reloc_overflow
:
2265 /* If the overflowing reloc was to an undefined symbol,
2266 we have already printed one error message and there
2267 is no point complaining again. */
2269 h
->root
.type
!= bfd_link_hash_undefined
)
2270 && (!((*info
->callbacks
->reloc_overflow
)
2271 (info
, name
, howto
->name
, (bfd_vma
) 0,
2272 input_bfd
, input_section
, rel
->r_offset
))))
2276 case bfd_reloc_undefined
:
2277 if (!((*info
->callbacks
->undefined_symbol
)
2278 (info
, name
, input_bfd
, input_section
,
2279 rel
->r_offset
, TRUE
)))
2283 case bfd_reloc_outofrange
:
2284 msg
= _("internal error: out of range error");
2287 case bfd_reloc_notsupported
:
2288 msg
= _("internal error: unsupported relocation error");
2291 case bfd_reloc_dangerous
:
2292 msg
= _("internal error: dangerous error");
2296 msg
= _("internal error: unknown error");
2300 if (!((*info
->callbacks
->warning
)
2301 (info
, msg
, name
, input_bfd
, input_section
,
2312 /* Set the right machine number. */
2315 elf32_arm_object_p (abfd
)
2320 mach
= bfd_arm_get_mach_from_notes (abfd
, ARM_NOTE_SECTION
);
2322 if (mach
!= bfd_mach_arm_unknown
)
2323 bfd_default_set_arch_mach (abfd
, bfd_arch_arm
, mach
);
2325 else if (elf_elfheader (abfd
)->e_flags
& EF_ARM_MAVERICK_FLOAT
)
2326 bfd_default_set_arch_mach (abfd
, bfd_arch_arm
, bfd_mach_arm_ep9312
);
2329 bfd_default_set_arch_mach (abfd
, bfd_arch_arm
, mach
);
2334 /* Function to keep ARM specific flags in the ELF header. */
2336 elf32_arm_set_private_flags (abfd
, flags
)
2340 if (elf_flags_init (abfd
)
2341 && elf_elfheader (abfd
)->e_flags
!= flags
)
2343 if (EF_ARM_EABI_VERSION (flags
) == EF_ARM_EABI_UNKNOWN
)
2345 if (flags
& EF_ARM_INTERWORK
)
2346 (*_bfd_error_handler
) (_("\
2347 Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"),
2348 bfd_archive_filename (abfd
));
2350 _bfd_error_handler (_("\
2351 Warning: Clearing the interworking flag of %s due to outside request"),
2352 bfd_archive_filename (abfd
));
2357 elf_elfheader (abfd
)->e_flags
= flags
;
2358 elf_flags_init (abfd
) = TRUE
;
2364 /* Copy backend specific data from one object module to another. */
2367 elf32_arm_copy_private_bfd_data (ibfd
, obfd
)
2374 if ( bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2375 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2378 in_flags
= elf_elfheader (ibfd
)->e_flags
;
2379 out_flags
= elf_elfheader (obfd
)->e_flags
;
2381 if (elf_flags_init (obfd
)
2382 && EF_ARM_EABI_VERSION (out_flags
) == EF_ARM_EABI_UNKNOWN
2383 && in_flags
!= out_flags
)
2385 /* Cannot mix APCS26 and APCS32 code. */
2386 if ((in_flags
& EF_ARM_APCS_26
) != (out_flags
& EF_ARM_APCS_26
))
2389 /* Cannot mix float APCS and non-float APCS code. */
2390 if ((in_flags
& EF_ARM_APCS_FLOAT
) != (out_flags
& EF_ARM_APCS_FLOAT
))
2393 /* If the src and dest have different interworking flags
2394 then turn off the interworking bit. */
2395 if ((in_flags
& EF_ARM_INTERWORK
) != (out_flags
& EF_ARM_INTERWORK
))
2397 if (out_flags
& EF_ARM_INTERWORK
)
2398 _bfd_error_handler (_("\
2399 Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"),
2400 bfd_get_filename (obfd
),
2401 bfd_archive_filename (ibfd
));
2403 in_flags
&= ~EF_ARM_INTERWORK
;
2406 /* Likewise for PIC, though don't warn for this case. */
2407 if ((in_flags
& EF_ARM_PIC
) != (out_flags
& EF_ARM_PIC
))
2408 in_flags
&= ~EF_ARM_PIC
;
2411 elf_elfheader (obfd
)->e_flags
= in_flags
;
2412 elf_flags_init (obfd
) = TRUE
;
2417 /* Merge backend specific data from an object file to the output
2418 object file when linking. */
2421 elf32_arm_merge_private_bfd_data (ibfd
, obfd
)
2427 bfd_boolean flags_compatible
= TRUE
;
2430 /* Check if we have the same endianess. */
2431 if (! _bfd_generic_verify_endian_match (ibfd
, obfd
))
2434 if ( bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2435 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2438 /* The input BFD must have had its flags initialised. */
2439 /* The following seems bogus to me -- The flags are initialized in
2440 the assembler but I don't think an elf_flags_init field is
2441 written into the object. */
2442 /* BFD_ASSERT (elf_flags_init (ibfd)); */
2444 in_flags
= elf_elfheader (ibfd
)->e_flags
;
2445 out_flags
= elf_elfheader (obfd
)->e_flags
;
2447 if (!elf_flags_init (obfd
))
2449 /* If the input is the default architecture and had the default
2450 flags then do not bother setting the flags for the output
2451 architecture, instead allow future merges to do this. If no
2452 future merges ever set these flags then they will retain their
2453 uninitialised values, which surprise surprise, correspond
2454 to the default values. */
2455 if (bfd_get_arch_info (ibfd
)->the_default
2456 && elf_elfheader (ibfd
)->e_flags
== 0)
2459 elf_flags_init (obfd
) = TRUE
;
2460 elf_elfheader (obfd
)->e_flags
= in_flags
;
2462 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
2463 && bfd_get_arch_info (obfd
)->the_default
)
2464 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
), bfd_get_mach (ibfd
));
2469 /* Determine what should happen if the input ARM architecture
2470 does not match the output ARM architecture. */
2471 if (! bfd_arm_merge_machines (ibfd
, obfd
))
2474 /* Identical flags must be compatible. */
2475 if (in_flags
== out_flags
)
2478 /* Check to see if the input BFD actually contains any sections. If
2479 not, its flags may not have been initialised either, but it
2480 cannot actually cause any incompatibility. Do not short-circuit
2481 dynamic objects; their section list may be emptied by
2482 elf_link_add_object_symbols.
2484 Also check to see if there are no code sections in the input.
2485 In this case there is no need to check for code specific flags.
2486 XXX - do we need to worry about floating-point format compatability
2487 in data sections ? */
2488 if (!(ibfd
->flags
& DYNAMIC
))
2490 bfd_boolean null_input_bfd
= TRUE
;
2491 bfd_boolean only_data_sections
= TRUE
;
2493 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2495 /* Ignore synthetic glue sections. */
2496 if (strcmp (sec
->name
, ".glue_7")
2497 && strcmp (sec
->name
, ".glue_7t"))
2499 if ((bfd_get_section_flags (ibfd
, sec
)
2500 & (SEC_LOAD
| SEC_CODE
| SEC_HAS_CONTENTS
))
2501 == (SEC_LOAD
| SEC_CODE
| SEC_HAS_CONTENTS
))
2502 only_data_sections
= FALSE
;
2504 null_input_bfd
= FALSE
;
2509 if (null_input_bfd
|| only_data_sections
)
2513 /* Complain about various flag mismatches. */
2514 if (EF_ARM_EABI_VERSION (in_flags
) != EF_ARM_EABI_VERSION (out_flags
))
2516 _bfd_error_handler (_("\
2517 ERROR: %s is compiled for EABI version %d, whereas %s is compiled for version %d"),
2518 bfd_archive_filename (ibfd
),
2519 (in_flags
& EF_ARM_EABIMASK
) >> 24,
2520 bfd_get_filename (obfd
),
2521 (out_flags
& EF_ARM_EABIMASK
) >> 24);
2525 /* Not sure what needs to be checked for EABI versions >= 1. */
2526 if (EF_ARM_EABI_VERSION (in_flags
) == EF_ARM_EABI_UNKNOWN
)
2528 if ((in_flags
& EF_ARM_APCS_26
) != (out_flags
& EF_ARM_APCS_26
))
2530 _bfd_error_handler (_("\
2531 ERROR: %s is compiled for APCS-%d, whereas target %s uses APCS-%d"),
2532 bfd_archive_filename (ibfd
),
2533 in_flags
& EF_ARM_APCS_26
? 26 : 32,
2534 bfd_get_filename (obfd
),
2535 out_flags
& EF_ARM_APCS_26
? 26 : 32);
2536 flags_compatible
= FALSE
;
2539 if ((in_flags
& EF_ARM_APCS_FLOAT
) != (out_flags
& EF_ARM_APCS_FLOAT
))
2541 if (in_flags
& EF_ARM_APCS_FLOAT
)
2542 _bfd_error_handler (_("\
2543 ERROR: %s passes floats in float registers, whereas %s passes them in integer registers"),
2544 bfd_archive_filename (ibfd
),
2545 bfd_get_filename (obfd
));
2547 _bfd_error_handler (_("\
2548 ERROR: %s passes floats in integer registers, whereas %s passes them in float registers"),
2549 bfd_archive_filename (ibfd
),
2550 bfd_get_filename (obfd
));
2552 flags_compatible
= FALSE
;
2555 if ((in_flags
& EF_ARM_VFP_FLOAT
) != (out_flags
& EF_ARM_VFP_FLOAT
))
2557 if (in_flags
& EF_ARM_VFP_FLOAT
)
2558 _bfd_error_handler (_("\
2559 ERROR: %s uses VFP instructions, whereas %s does not"),
2560 bfd_archive_filename (ibfd
),
2561 bfd_get_filename (obfd
));
2563 _bfd_error_handler (_("\
2564 ERROR: %s uses FPA instructions, whereas %s does not"),
2565 bfd_archive_filename (ibfd
),
2566 bfd_get_filename (obfd
));
2568 flags_compatible
= FALSE
;
2571 if ((in_flags
& EF_ARM_MAVERICK_FLOAT
) != (out_flags
& EF_ARM_MAVERICK_FLOAT
))
2573 if (in_flags
& EF_ARM_MAVERICK_FLOAT
)
2574 _bfd_error_handler (_("\
2575 ERROR: %s uses Maverick instructions, whereas %s does not"),
2576 bfd_archive_filename (ibfd
),
2577 bfd_get_filename (obfd
));
2579 _bfd_error_handler (_("\
2580 ERROR: %s does not use Maverick instructions, whereas %s does"),
2581 bfd_archive_filename (ibfd
),
2582 bfd_get_filename (obfd
));
2584 flags_compatible
= FALSE
;
2587 #ifdef EF_ARM_SOFT_FLOAT
2588 if ((in_flags
& EF_ARM_SOFT_FLOAT
) != (out_flags
& EF_ARM_SOFT_FLOAT
))
2590 /* We can allow interworking between code that is VFP format
2591 layout, and uses either soft float or integer regs for
2592 passing floating point arguments and results. We already
2593 know that the APCS_FLOAT flags match; similarly for VFP
2595 if ((in_flags
& EF_ARM_APCS_FLOAT
) != 0
2596 || (in_flags
& EF_ARM_VFP_FLOAT
) == 0)
2598 if (in_flags
& EF_ARM_SOFT_FLOAT
)
2599 _bfd_error_handler (_("\
2600 ERROR: %s uses software FP, whereas %s uses hardware FP"),
2601 bfd_archive_filename (ibfd
),
2602 bfd_get_filename (obfd
));
2604 _bfd_error_handler (_("\
2605 ERROR: %s uses hardware FP, whereas %s uses software FP"),
2606 bfd_archive_filename (ibfd
),
2607 bfd_get_filename (obfd
));
2609 flags_compatible
= FALSE
;
2614 /* Interworking mismatch is only a warning. */
2615 if ((in_flags
& EF_ARM_INTERWORK
) != (out_flags
& EF_ARM_INTERWORK
))
2617 if (in_flags
& EF_ARM_INTERWORK
)
2619 _bfd_error_handler (_("\
2620 Warning: %s supports interworking, whereas %s does not"),
2621 bfd_archive_filename (ibfd
),
2622 bfd_get_filename (obfd
));
2626 _bfd_error_handler (_("\
2627 Warning: %s does not support interworking, whereas %s does"),
2628 bfd_archive_filename (ibfd
),
2629 bfd_get_filename (obfd
));
2634 return flags_compatible
;
2637 /* Display the flags field. */
2640 elf32_arm_print_private_bfd_data (abfd
, ptr
)
2644 FILE * file
= (FILE *) ptr
;
2645 unsigned long flags
;
2647 BFD_ASSERT (abfd
!= NULL
&& ptr
!= NULL
);
2649 /* Print normal ELF private data. */
2650 _bfd_elf_print_private_bfd_data (abfd
, ptr
);
2652 flags
= elf_elfheader (abfd
)->e_flags
;
2653 /* Ignore init flag - it may not be set, despite the flags field
2654 containing valid data. */
2656 /* xgettext:c-format */
2657 fprintf (file
, _("private flags = %lx:"), elf_elfheader (abfd
)->e_flags
);
2659 switch (EF_ARM_EABI_VERSION (flags
))
2661 case EF_ARM_EABI_UNKNOWN
:
2662 /* The following flag bits are GNU extensions and not part of the
2663 official ARM ELF extended ABI. Hence they are only decoded if
2664 the EABI version is not set. */
2665 if (flags
& EF_ARM_INTERWORK
)
2666 fprintf (file
, _(" [interworking enabled]"));
2668 if (flags
& EF_ARM_APCS_26
)
2669 fprintf (file
, " [APCS-26]");
2671 fprintf (file
, " [APCS-32]");
2673 if (flags
& EF_ARM_VFP_FLOAT
)
2674 fprintf (file
, _(" [VFP float format]"));
2675 else if (flags
& EF_ARM_MAVERICK_FLOAT
)
2676 fprintf (file
, _(" [Maverick float format]"));
2678 fprintf (file
, _(" [FPA float format]"));
2680 if (flags
& EF_ARM_APCS_FLOAT
)
2681 fprintf (file
, _(" [floats passed in float registers]"));
2683 if (flags
& EF_ARM_PIC
)
2684 fprintf (file
, _(" [position independent]"));
2686 if (flags
& EF_ARM_NEW_ABI
)
2687 fprintf (file
, _(" [new ABI]"));
2689 if (flags
& EF_ARM_OLD_ABI
)
2690 fprintf (file
, _(" [old ABI]"));
2692 if (flags
& EF_ARM_SOFT_FLOAT
)
2693 fprintf (file
, _(" [software FP]"));
2695 flags
&= ~(EF_ARM_INTERWORK
| EF_ARM_APCS_26
| EF_ARM_APCS_FLOAT
2696 | EF_ARM_PIC
| EF_ARM_NEW_ABI
| EF_ARM_OLD_ABI
2697 | EF_ARM_SOFT_FLOAT
| EF_ARM_VFP_FLOAT
2698 | EF_ARM_MAVERICK_FLOAT
);
2701 case EF_ARM_EABI_VER1
:
2702 fprintf (file
, _(" [Version1 EABI]"));
2704 if (flags
& EF_ARM_SYMSARESORTED
)
2705 fprintf (file
, _(" [sorted symbol table]"));
2707 fprintf (file
, _(" [unsorted symbol table]"));
2709 flags
&= ~ EF_ARM_SYMSARESORTED
;
2712 case EF_ARM_EABI_VER2
:
2713 fprintf (file
, _(" [Version2 EABI]"));
2715 if (flags
& EF_ARM_SYMSARESORTED
)
2716 fprintf (file
, _(" [sorted symbol table]"));
2718 fprintf (file
, _(" [unsorted symbol table]"));
2720 if (flags
& EF_ARM_DYNSYMSUSESEGIDX
)
2721 fprintf (file
, _(" [dynamic symbols use segment index]"));
2723 if (flags
& EF_ARM_MAPSYMSFIRST
)
2724 fprintf (file
, _(" [mapping symbols precede others]"));
2726 flags
&= ~(EF_ARM_SYMSARESORTED
| EF_ARM_DYNSYMSUSESEGIDX
2727 | EF_ARM_MAPSYMSFIRST
);
2730 case EF_ARM_EABI_VER3
:
2731 fprintf (file
, _(" [Version3 EABI]"));
2733 if (flags
& EF_ARM_BE8
)
2734 fprintf (file
, _(" [BE8]"));
2736 if (flags
& EF_ARM_LE8
)
2737 fprintf (file
, _(" [LE8]"));
2739 flags
&= ~(EF_ARM_LE8
| EF_ARM_BE8
);
2743 fprintf (file
, _(" <EABI version unrecognised>"));
2747 flags
&= ~ EF_ARM_EABIMASK
;
2749 if (flags
& EF_ARM_RELEXEC
)
2750 fprintf (file
, _(" [relocatable executable]"));
2752 if (flags
& EF_ARM_HASENTRY
)
2753 fprintf (file
, _(" [has entry point]"));
2755 flags
&= ~ (EF_ARM_RELEXEC
| EF_ARM_HASENTRY
);
2758 fprintf (file
, _("<Unrecognised flag bits set>"));
2766 elf32_arm_get_symbol_type (elf_sym
, type
)
2767 Elf_Internal_Sym
* elf_sym
;
2770 switch (ELF_ST_TYPE (elf_sym
->st_info
))
2773 return ELF_ST_TYPE (elf_sym
->st_info
);
2776 /* If the symbol is not an object, return the STT_ARM_16BIT flag.
2777 This allows us to distinguish between data used by Thumb instructions
2778 and non-data (which is probably code) inside Thumb regions of an
2780 if (type
!= STT_OBJECT
)
2781 return ELF_ST_TYPE (elf_sym
->st_info
);
2792 elf32_arm_gc_mark_hook (sec
, info
, rel
, h
, sym
)
2794 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
2795 Elf_Internal_Rela
*rel
;
2796 struct elf_link_hash_entry
*h
;
2797 Elf_Internal_Sym
*sym
;
2801 switch (ELF32_R_TYPE (rel
->r_info
))
2803 case R_ARM_GNU_VTINHERIT
:
2804 case R_ARM_GNU_VTENTRY
:
2808 switch (h
->root
.type
)
2810 case bfd_link_hash_defined
:
2811 case bfd_link_hash_defweak
:
2812 return h
->root
.u
.def
.section
;
2814 case bfd_link_hash_common
:
2815 return h
->root
.u
.c
.p
->section
;
2823 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
2828 /* Update the got entry reference counts for the section being removed. */
2831 elf32_arm_gc_sweep_hook (abfd
, info
, sec
, relocs
)
2832 bfd
*abfd ATTRIBUTE_UNUSED
;
2833 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
2834 asection
*sec ATTRIBUTE_UNUSED
;
2835 const Elf_Internal_Rela
*relocs ATTRIBUTE_UNUSED
;
2837 Elf_Internal_Shdr
*symtab_hdr
;
2838 struct elf_link_hash_entry
**sym_hashes
;
2839 bfd_signed_vma
*local_got_refcounts
;
2840 const Elf_Internal_Rela
*rel
, *relend
;
2841 unsigned long r_symndx
;
2842 struct elf_link_hash_entry
*h
;
2844 elf_section_data (sec
)->local_dynrel
= NULL
;
2846 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2847 sym_hashes
= elf_sym_hashes (abfd
);
2848 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2850 relend
= relocs
+ sec
->reloc_count
;
2851 for (rel
= relocs
; rel
< relend
; rel
++)
2852 switch (ELF32_R_TYPE (rel
->r_info
))
2855 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2856 if (r_symndx
>= symtab_hdr
->sh_info
)
2858 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2859 if (h
->got
.refcount
> 0)
2860 h
->got
.refcount
-= 1;
2862 else if (local_got_refcounts
!= NULL
)
2864 if (local_got_refcounts
[r_symndx
] > 0)
2865 local_got_refcounts
[r_symndx
] -= 1;
2873 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2874 if (r_symndx
>= symtab_hdr
->sh_info
)
2876 struct elf32_arm_link_hash_entry
*eh
;
2877 struct elf32_arm_relocs_copied
**pp
;
2878 struct elf32_arm_relocs_copied
*p
;
2880 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2882 if (h
->plt
.refcount
> 0)
2883 h
->plt
.refcount
-= 1;
2885 if (ELF32_R_TYPE (rel
->r_info
) == R_ARM_ABS32
2886 || ELF32_R_TYPE (rel
->r_info
) == R_ARM_REL32
)
2888 eh
= (struct elf32_arm_link_hash_entry
*) h
;
2890 for (pp
= &eh
->relocs_copied
; (p
= *pp
) != NULL
;
2892 if (p
->section
== sec
)
2910 /* Look through the relocs for a section during the first phase. */
2913 elf32_arm_check_relocs (abfd
, info
, sec
, relocs
)
2915 struct bfd_link_info
*info
;
2917 const Elf_Internal_Rela
*relocs
;
2919 Elf_Internal_Shdr
*symtab_hdr
;
2920 struct elf_link_hash_entry
**sym_hashes
;
2921 struct elf_link_hash_entry
**sym_hashes_end
;
2922 const Elf_Internal_Rela
*rel
;
2923 const Elf_Internal_Rela
*rel_end
;
2926 bfd_vma
*local_got_offsets
;
2927 struct elf32_arm_link_hash_table
*htab
;
2929 if (info
->relocatable
)
2932 htab
= elf32_arm_hash_table (info
);
2935 dynobj
= elf_hash_table (info
)->dynobj
;
2936 local_got_offsets
= elf_local_got_offsets (abfd
);
2938 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2939 sym_hashes
= elf_sym_hashes (abfd
);
2940 sym_hashes_end
= sym_hashes
2941 + symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
2943 if (!elf_bad_symtab (abfd
))
2944 sym_hashes_end
-= symtab_hdr
->sh_info
;
2946 rel_end
= relocs
+ sec
->reloc_count
;
2947 for (rel
= relocs
; rel
< rel_end
; rel
++)
2949 struct elf_link_hash_entry
*h
;
2950 unsigned long r_symndx
;
2952 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2953 if (r_symndx
< symtab_hdr
->sh_info
)
2956 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2958 switch (ELF32_R_TYPE (rel
->r_info
))
2961 /* This symbol requires a global offset table entry. */
2968 bfd_signed_vma
*local_got_refcounts
;
2970 /* This is a global offset table entry for a local symbol. */
2971 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2972 if (local_got_refcounts
== NULL
)
2976 size
= symtab_hdr
->sh_info
;
2977 size
*= (sizeof (bfd_signed_vma
) + sizeof(char));
2978 local_got_refcounts
= ((bfd_signed_vma
*)
2979 bfd_zalloc (abfd
, size
));
2980 if (local_got_refcounts
== NULL
)
2982 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
2984 local_got_refcounts
[r_symndx
] += 1;
2990 if (htab
->sgot
== NULL
)
2992 if (htab
->root
.dynobj
== NULL
)
2993 htab
->root
.dynobj
= abfd
;
2994 if (!create_got_section (htab
->root
.dynobj
, info
))
3005 /* If this reloc is in a read-only section, we might
3006 need a copy reloc. We can't check reliably at this
3007 stage whether the section is read-only, as input
3008 sections have not yet been mapped to output sections.
3009 Tentatively set the flag for now, and correct in
3010 adjust_dynamic_symbol. */
3012 h
->elf_link_hash_flags
|= ELF_LINK_NON_GOT_REF
;
3014 /* We may need a .plt entry if the function this reloc
3015 refers to is in a different object. We can't tell for
3016 sure yet, because something later might force the
3018 if (ELF32_R_TYPE (rel
->r_info
) == R_ARM_PC24
3019 || ELF32_R_TYPE (rel
->r_info
) == R_ARM_PLT32
)
3020 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_PLT
;
3022 /* If we create a PLT entry, this relocation will reference
3023 it, even if it's an ABS32 relocation. */
3024 h
->plt
.refcount
+= 1;
3027 /* If we are creating a shared library, and this is a reloc
3028 against a global symbol, or a non PC relative reloc
3029 against a local symbol, then we need to copy the reloc
3030 into the shared library. However, if we are linking with
3031 -Bsymbolic, we do not need to copy a reloc against a
3032 global symbol which is defined in an object we are
3033 including in the link (i.e., DEF_REGULAR is set). At
3034 this point we have not seen all the input files, so it is
3035 possible that DEF_REGULAR is not set now but will be set
3036 later (it is never cleared). We account for that
3037 possibility below by storing information in the
3038 relocs_copied field of the hash table entry. */
3040 && (sec
->flags
& SEC_ALLOC
) != 0
3041 && ((ELF32_R_TYPE (rel
->r_info
) != R_ARM_PC24
3042 && ELF32_R_TYPE (rel
->r_info
) != R_ARM_PLT32
)
3044 && (! info
->symbolic
3045 || (h
->elf_link_hash_flags
3046 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
3048 struct elf32_arm_relocs_copied
*p
, **head
;
3050 /* When creating a shared object, we must copy these
3051 reloc types into the output file. We create a reloc
3052 section in dynobj and make room for this reloc. */
3057 name
= (bfd_elf_string_from_elf_section
3059 elf_elfheader (abfd
)->e_shstrndx
,
3060 elf_section_data (sec
)->rel_hdr
.sh_name
));
3064 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
3065 && strcmp (bfd_get_section_name (abfd
, sec
),
3068 sreloc
= bfd_get_section_by_name (dynobj
, name
);
3073 sreloc
= bfd_make_section (dynobj
, name
);
3074 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
3075 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
3076 if ((sec
->flags
& SEC_ALLOC
) != 0)
3077 flags
|= SEC_ALLOC
| SEC_LOAD
;
3079 || ! bfd_set_section_flags (dynobj
, sreloc
, flags
)
3080 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
3084 elf_section_data (sec
)->sreloc
= sreloc
;
3087 /* If this is a global symbol, we count the number of
3088 relocations we need for this symbol. */
3091 head
= &((struct elf32_arm_link_hash_entry
*) h
)->relocs_copied
;
3095 /* Track dynamic relocs needed for local syms too.
3096 We really need local syms available to do this
3100 s
= bfd_section_from_r_symndx (abfd
, &htab
->sym_sec
,
3105 head
= ((struct elf32_arm_relocs_copied
**)
3106 &elf_section_data (s
)->local_dynrel
);
3110 if (p
== NULL
|| p
->section
!= sec
)
3112 bfd_size_type amt
= sizeof *p
;
3113 p
= bfd_alloc (htab
->root
.dynobj
, amt
);
3122 if (ELF32_R_TYPE (rel
->r_info
) == R_ARM_ABS32
3123 || ELF32_R_TYPE (rel
->r_info
) == R_ARM_REL32
)
3128 /* This relocation describes the C++ object vtable hierarchy.
3129 Reconstruct it for later use during GC. */
3130 case R_ARM_GNU_VTINHERIT
:
3131 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
3135 /* This relocation describes which C++ vtable entries are actually
3136 used. Record for later use during GC. */
3137 case R_ARM_GNU_VTENTRY
:
3138 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
3147 /* Find the nearest line to a particular section and offset, for error
3148 reporting. This code is a duplicate of the code in elf.c, except
3149 that it also accepts STT_ARM_TFUNC as a symbol that names a function. */
3152 elf32_arm_find_nearest_line
3153 (abfd
, section
, symbols
, offset
, filename_ptr
, functionname_ptr
, line_ptr
)
3158 const char **filename_ptr
;
3159 const char **functionname_ptr
;
3160 unsigned int *line_ptr
;
3163 const char *filename
;
3168 if (_bfd_dwarf2_find_nearest_line (abfd
, section
, symbols
, offset
,
3169 filename_ptr
, functionname_ptr
,
3171 &elf_tdata (abfd
)->dwarf2_find_line_info
))
3174 if (! _bfd_stab_section_find_nearest_line (abfd
, symbols
, section
, offset
,
3175 &found
, filename_ptr
,
3176 functionname_ptr
, line_ptr
,
3177 &elf_tdata (abfd
)->line_info
))
3183 if (symbols
== NULL
)
3190 for (p
= symbols
; *p
!= NULL
; p
++)
3194 q
= (elf_symbol_type
*) *p
;
3196 if (bfd_get_section (&q
->symbol
) != section
)
3199 switch (ELF_ST_TYPE (q
->internal_elf_sym
.st_info
))
3204 filename
= bfd_asymbol_name (&q
->symbol
);
3209 if (q
->symbol
.section
== section
3210 && q
->symbol
.value
>= low_func
3211 && q
->symbol
.value
<= offset
)
3213 func
= (asymbol
*) q
;
3214 low_func
= q
->symbol
.value
;
3223 *filename_ptr
= filename
;
3224 *functionname_ptr
= bfd_asymbol_name (func
);
3230 /* Adjust a symbol defined by a dynamic object and referenced by a
3231 regular object. The current definition is in some section of the
3232 dynamic object, but we're not including those sections. We have to
3233 change the definition to something the rest of the link can
3237 elf32_arm_adjust_dynamic_symbol (info
, h
)
3238 struct bfd_link_info
* info
;
3239 struct elf_link_hash_entry
* h
;
3243 unsigned int power_of_two
;
3245 dynobj
= elf_hash_table (info
)->dynobj
;
3247 /* Make sure we know what is going on here. */
3248 BFD_ASSERT (dynobj
!= NULL
3249 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
)
3250 || h
->weakdef
!= NULL
3251 || ((h
->elf_link_hash_flags
3252 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3253 && (h
->elf_link_hash_flags
3254 & ELF_LINK_HASH_REF_REGULAR
) != 0
3255 && (h
->elf_link_hash_flags
3256 & ELF_LINK_HASH_DEF_REGULAR
) == 0)));
3258 /* If this is a function, put it in the procedure linkage table. We
3259 will fill in the contents of the procedure linkage table later,
3260 when we know the address of the .got section. */
3261 if (h
->type
== STT_FUNC
3262 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0)
3264 if (h
->plt
.refcount
<= 0
3265 || SYMBOL_CALLS_LOCAL (info
, h
)
3266 || (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3267 && h
->root
.type
== bfd_link_hash_undefweak
))
3269 /* This case can occur if we saw a PLT32 reloc in an input
3270 file, but the symbol was never referred to by a dynamic
3271 object, or if all references were garbage collected. In
3272 such a case, we don't actually need to build a procedure
3273 linkage table, and we can just do a PC24 reloc instead. */
3274 h
->plt
.offset
= (bfd_vma
) -1;
3275 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
3281 /* It's possible that we incorrectly decided a .plt reloc was
3282 needed for an R_ARM_PC24 reloc to a non-function sym in
3283 check_relocs. We can't decide accurately between function and
3284 non-function syms in check-relocs; Objects loaded later in
3285 the link may change h->type. So fix it now. */
3286 h
->plt
.offset
= (bfd_vma
) -1;
3288 /* If this is a weak symbol, and there is a real definition, the
3289 processor independent code will have arranged for us to see the
3290 real definition first, and we can just use the same value. */
3291 if (h
->weakdef
!= NULL
)
3293 BFD_ASSERT (h
->weakdef
->root
.type
== bfd_link_hash_defined
3294 || h
->weakdef
->root
.type
== bfd_link_hash_defweak
);
3295 h
->root
.u
.def
.section
= h
->weakdef
->root
.u
.def
.section
;
3296 h
->root
.u
.def
.value
= h
->weakdef
->root
.u
.def
.value
;
3300 /* This is a reference to a symbol defined by a dynamic object which
3301 is not a function. */
3303 /* If we are creating a shared library, we must presume that the
3304 only references to the symbol are via the global offset table.
3305 For such cases we need not do anything here; the relocations will
3306 be handled correctly by relocate_section. */
3310 /* We must allocate the symbol in our .dynbss section, which will
3311 become part of the .bss section of the executable. There will be
3312 an entry for this symbol in the .dynsym section. The dynamic
3313 object will contain position independent code, so all references
3314 from the dynamic object to this symbol will go through the global
3315 offset table. The dynamic linker will use the .dynsym entry to
3316 determine the address it must put in the global offset table, so
3317 both the dynamic object and the regular object will refer to the
3318 same memory location for the variable. */
3319 s
= bfd_get_section_by_name (dynobj
, ".dynbss");
3320 BFD_ASSERT (s
!= NULL
);
3322 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to
3323 copy the initial value out of the dynamic object and into the
3324 runtime process image. We need to remember the offset into the
3325 .rel.bss section we are going to use. */
3326 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
3330 srel
= bfd_get_section_by_name (dynobj
, ".rel.bss");
3331 BFD_ASSERT (srel
!= NULL
);
3332 srel
->_raw_size
+= sizeof (Elf32_External_Rel
);
3333 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_COPY
;
3336 /* We need to figure out the alignment required for this symbol. I
3337 have no idea how ELF linkers handle this. */
3338 power_of_two
= bfd_log2 (h
->size
);
3339 if (power_of_two
> 3)
3342 /* Apply the required alignment. */
3343 s
->_raw_size
= BFD_ALIGN (s
->_raw_size
,
3344 (bfd_size_type
) (1 << power_of_two
));
3345 if (power_of_two
> bfd_get_section_alignment (dynobj
, s
))
3347 if (! bfd_set_section_alignment (dynobj
, s
, power_of_two
))
3351 /* Define the symbol as being at this point in the section. */
3352 h
->root
.u
.def
.section
= s
;
3353 h
->root
.u
.def
.value
= s
->_raw_size
;
3355 /* Increment the section size to make room for the symbol. */
3356 s
->_raw_size
+= h
->size
;
3361 /* Allocate space in .plt, .got and associated reloc sections for
3365 allocate_dynrelocs (h
, inf
)
3366 struct elf_link_hash_entry
*h
;
3369 struct bfd_link_info
*info
;
3370 struct elf32_arm_link_hash_table
*htab
;
3371 struct elf32_arm_link_hash_entry
*eh
;
3372 struct elf32_arm_relocs_copied
*p
;
3374 if (h
->root
.type
== bfd_link_hash_indirect
)
3377 if (h
->root
.type
== bfd_link_hash_warning
)
3378 /* When warning symbols are created, they **replace** the "real"
3379 entry in the hash table, thus we never get to see the real
3380 symbol in a hash traversal. So look at it now. */
3381 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3383 info
= (struct bfd_link_info
*) inf
;
3384 htab
= elf32_arm_hash_table (info
);
3386 if (htab
->root
.dynamic_sections_created
3387 && h
->plt
.refcount
> 0)
3389 /* Make sure this symbol is output as a dynamic symbol.
3390 Undefined weak syms won't yet be marked as dynamic. */
3391 if (h
->dynindx
== -1
3392 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3394 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3399 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h
))
3401 asection
*s
= htab
->splt
;
3403 /* If this is the first .plt entry, make room for the special
3405 if (s
->_raw_size
== 0)
3406 s
->_raw_size
+= PLT_HEADER_SIZE
;
3408 h
->plt
.offset
= s
->_raw_size
;
3410 /* If this symbol is not defined in a regular file, and we are
3411 not generating a shared library, then set the symbol to this
3412 location in the .plt. This is required to make function
3413 pointers compare as equal between the normal executable and
3414 the shared library. */
3416 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3418 h
->root
.u
.def
.section
= s
;
3419 h
->root
.u
.def
.value
= h
->plt
.offset
;
3422 /* Make room for this entry. */
3423 s
->_raw_size
+= PLT_ENTRY_SIZE
;
3425 /* We also need to make an entry in the .got.plt section, which
3426 will be placed in the .got section by the linker script. */
3427 htab
->sgotplt
->_raw_size
+= 4;
3429 /* We also need to make an entry in the .rel.plt section. */
3430 htab
->srelplt
->_raw_size
+= sizeof (Elf32_External_Rel
);
3434 h
->plt
.offset
= (bfd_vma
) -1;
3435 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
3440 h
->plt
.offset
= (bfd_vma
) -1;
3441 h
->elf_link_hash_flags
&= ~ELF_LINK_HASH_NEEDS_PLT
;
3444 if (h
->got
.refcount
> 0)
3449 /* Make sure this symbol is output as a dynamic symbol.
3450 Undefined weak syms won't yet be marked as dynamic. */
3451 if (h
->dynindx
== -1
3452 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3454 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3459 h
->got
.offset
= s
->_raw_size
;
3461 dyn
= htab
->root
.dynamic_sections_created
;
3462 if ((ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3463 || h
->root
.type
!= bfd_link_hash_undefweak
)
3465 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn
, 0, h
)))
3466 htab
->srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
3469 h
->got
.offset
= (bfd_vma
) -1;
3471 eh
= (struct elf32_arm_link_hash_entry
*) h
;
3472 if (eh
->relocs_copied
== NULL
)
3475 /* In the shared -Bsymbolic case, discard space allocated for
3476 dynamic pc-relative relocs against symbols which turn out to be
3477 defined in regular objects. For the normal shared case, discard
3478 space for pc-relative relocs that have become local due to symbol
3479 visibility changes. */
3483 /* Discard relocs on undefined weak syms with non-default
3485 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3486 && h
->root
.type
== bfd_link_hash_undefweak
)
3487 eh
->relocs_copied
= NULL
;
3491 /* For the non-shared case, discard space for relocs against
3492 symbols which turn out to need copy relocs or are not
3495 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_GOT_REF
) == 0
3496 && (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3497 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3498 || (htab
->root
.dynamic_sections_created
3499 && (h
->root
.type
== bfd_link_hash_undefweak
3500 || h
->root
.type
== bfd_link_hash_undefined
))))
3502 /* Make sure this symbol is output as a dynamic symbol.
3503 Undefined weak syms won't yet be marked as dynamic. */
3504 if (h
->dynindx
== -1
3505 && (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3507 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
3511 /* If that succeeded, we know we'll be keeping all the
3513 if (h
->dynindx
!= -1)
3517 eh
->relocs_copied
= NULL
;
3522 /* Finally, allocate space. */
3523 for (p
= eh
->relocs_copied
; p
!= NULL
; p
= p
->next
)
3525 asection
*sreloc
= elf_section_data (p
->section
)->sreloc
;
3526 sreloc
->_raw_size
+= p
->count
* sizeof (Elf32_External_Rel
);
3532 /* Set the sizes of the dynamic sections. */
3535 elf32_arm_size_dynamic_sections (output_bfd
, info
)
3536 bfd
* output_bfd ATTRIBUTE_UNUSED
;
3537 struct bfd_link_info
* info
;
3544 struct elf32_arm_link_hash_table
*htab
;
3546 htab
= elf32_arm_hash_table (info
);
3547 dynobj
= elf_hash_table (info
)->dynobj
;
3548 BFD_ASSERT (dynobj
!= NULL
);
3550 if (elf_hash_table (info
)->dynamic_sections_created
)
3552 /* Set the contents of the .interp section to the interpreter. */
3553 if (info
->executable
)
3555 s
= bfd_get_section_by_name (dynobj
, ".interp");
3556 BFD_ASSERT (s
!= NULL
);
3557 s
->_raw_size
= sizeof ELF_DYNAMIC_INTERPRETER
;
3558 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
3562 /* Set up .got offsets for local syms, and space for local dynamic
3564 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
3566 bfd_signed_vma
*local_got
;
3567 bfd_signed_vma
*end_local_got
;
3568 char *local_tls_type
;
3569 bfd_size_type locsymcount
;
3570 Elf_Internal_Shdr
*symtab_hdr
;
3573 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
3576 for (s
= ibfd
->sections
; s
!= NULL
; s
= s
->next
)
3578 struct elf32_arm_relocs_copied
*p
;
3580 for (p
= *((struct elf32_arm_relocs_copied
**)
3581 &elf_section_data (s
)->local_dynrel
);
3585 if (!bfd_is_abs_section (p
->section
)
3586 && bfd_is_abs_section (p
->section
->output_section
))
3588 /* Input section has been discarded, either because
3589 it is a copy of a linkonce section or due to
3590 linker script /DISCARD/, so we'll be discarding
3593 else if (p
->count
!= 0)
3595 srel
= elf_section_data (p
->section
)->sreloc
;
3596 srel
->_raw_size
+= p
->count
* sizeof (Elf32_External_Rel
);
3597 if ((p
->section
->output_section
->flags
& SEC_READONLY
) != 0)
3598 info
->flags
|= DF_TEXTREL
;
3603 local_got
= elf_local_got_refcounts (ibfd
);
3607 symtab_hdr
= &elf_tdata (ibfd
)->symtab_hdr
;
3608 locsymcount
= symtab_hdr
->sh_info
;
3609 end_local_got
= local_got
+ locsymcount
;
3611 srel
= htab
->srelgot
;
3612 for (; local_got
< end_local_got
; ++local_got
, ++local_tls_type
)
3616 *local_got
= s
->_raw_size
;
3619 srel
->_raw_size
+= sizeof (Elf32_External_Rel
);
3622 *local_got
= (bfd_vma
) -1;
3626 /* Allocate global sym .plt and .got entries, and space for global
3627 sym dynamic relocs. */
3628 elf_link_hash_traverse (&htab
->root
, allocate_dynrelocs
, (PTR
) info
);
3630 /* The check_relocs and adjust_dynamic_symbol entry points have
3631 determined the sizes of the various dynamic sections. Allocate
3635 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3640 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3643 /* It's OK to base decisions on the section name, because none
3644 of the dynobj section names depend upon the input files. */
3645 name
= bfd_get_section_name (dynobj
, s
);
3649 if (strcmp (name
, ".plt") == 0)
3651 if (s
->_raw_size
== 0)
3653 /* Strip this section if we don't need it; see the
3659 /* Remember whether there is a PLT. */
3663 else if (strncmp (name
, ".rel", 4) == 0)
3665 if (s
->_raw_size
== 0)
3667 /* If we don't need this section, strip it from the
3668 output file. This is mostly to handle .rel.bss and
3669 .rel.plt. We must create both sections in
3670 create_dynamic_sections, because they must be created
3671 before the linker maps input sections to output
3672 sections. The linker does that before
3673 adjust_dynamic_symbol is called, and it is that
3674 function which decides whether anything needs to go
3675 into these sections. */
3680 /* Remember whether there are any reloc sections other
3682 if (strcmp (name
, ".rel.plt") != 0)
3685 /* We use the reloc_count field as a counter if we need
3686 to copy relocs into the output file. */
3690 else if (strncmp (name
, ".got", 4) != 0)
3692 /* It's not one of our sections, so don't allocate space. */
3698 _bfd_strip_section_from_output (info
, s
);
3702 /* Allocate memory for the section contents. */
3703 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->_raw_size
);
3704 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3708 if (elf_hash_table (info
)->dynamic_sections_created
)
3710 /* Add some entries to the .dynamic section. We fill in the
3711 values later, in elf32_arm_finish_dynamic_sections, but we
3712 must add the entries now so that we get the correct size for
3713 the .dynamic section. The DT_DEBUG entry is filled in by the
3714 dynamic linker and used by the debugger. */
3715 #define add_dynamic_entry(TAG, VAL) \
3716 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3720 if (!add_dynamic_entry (DT_DEBUG
, 0))
3726 if ( !add_dynamic_entry (DT_PLTGOT
, 0)
3727 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
3728 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
3729 || !add_dynamic_entry (DT_JMPREL
, 0))
3735 if ( !add_dynamic_entry (DT_REL
, 0)
3736 || !add_dynamic_entry (DT_RELSZ
, 0)
3737 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
3741 if ((info
->flags
& DF_TEXTREL
) != 0)
3743 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3745 info
->flags
|= DF_TEXTREL
;
3748 #undef add_synamic_entry
3753 /* Finish up dynamic symbol handling. We set the contents of various
3754 dynamic sections here. */
3757 elf32_arm_finish_dynamic_symbol (output_bfd
, info
, h
, sym
)
3759 struct bfd_link_info
* info
;
3760 struct elf_link_hash_entry
* h
;
3761 Elf_Internal_Sym
* sym
;
3765 dynobj
= elf_hash_table (info
)->dynobj
;
3767 if (h
->plt
.offset
!= (bfd_vma
) -1)
3774 Elf_Internal_Rela rel
;
3776 bfd_vma got_displacement
;
3778 /* This symbol has an entry in the procedure linkage table. Set
3781 BFD_ASSERT (h
->dynindx
!= -1);
3783 splt
= bfd_get_section_by_name (dynobj
, ".plt");
3784 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
3785 srel
= bfd_get_section_by_name (dynobj
, ".rel.plt");
3786 BFD_ASSERT (splt
!= NULL
&& sgot
!= NULL
&& srel
!= NULL
);
3788 /* Get the index in the procedure linkage table which
3789 corresponds to this symbol. This is the index of this symbol
3790 in all the symbols for which we are making plt entries. The
3791 first entry in the procedure linkage table is reserved. */
3792 plt_index
= (h
->plt
.offset
- PLT_HEADER_SIZE
) / PLT_ENTRY_SIZE
;
3794 /* Get the offset into the .got table of the entry that
3795 corresponds to this function. Each .got entry is 4 bytes.
3796 The first three are reserved. */
3797 got_offset
= (plt_index
+ 3) * 4;
3799 /* Calculate the displacement between the PLT slot and the
3800 entry in the GOT. */
3801 got_displacement
= (sgot
->output_section
->vma
3802 + sgot
->output_offset
3804 - splt
->output_section
->vma
3805 - splt
->output_offset
3809 BFD_ASSERT ((got_displacement
& 0xf0000000) == 0);
3811 /* Fill in the entry in the procedure linkage table. */
3812 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[0] | ((got_displacement
& 0x0ff00000) >> 20),
3813 splt
->contents
+ h
->plt
.offset
+ 0);
3814 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[1] | ((got_displacement
& 0x000ff000) >> 12),
3815 splt
->contents
+ h
->plt
.offset
+ 4);
3816 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[2] | (got_displacement
& 0x00000fff),
3817 splt
->contents
+ h
->plt
.offset
+ 8);
3818 #ifdef FOUR_WORD_PLT
3819 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[3],
3820 splt
->contents
+ h
->plt
.offset
+ 12);
3823 /* Fill in the entry in the global offset table. */
3824 bfd_put_32 (output_bfd
,
3825 (splt
->output_section
->vma
3826 + splt
->output_offset
),
3827 sgot
->contents
+ got_offset
);
3829 /* Fill in the entry in the .rel.plt section. */
3830 rel
.r_offset
= (sgot
->output_section
->vma
3831 + sgot
->output_offset
3833 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_JUMP_SLOT
);
3834 loc
= srel
->contents
+ plt_index
* sizeof (Elf32_External_Rel
);
3835 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3837 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3839 /* Mark the symbol as undefined, rather than as defined in
3840 the .plt section. Leave the value alone. */
3841 sym
->st_shndx
= SHN_UNDEF
;
3842 /* If the symbol is weak, we do need to clear the value.
3843 Otherwise, the PLT entry would provide a definition for
3844 the symbol even if the symbol wasn't defined anywhere,
3845 and so the symbol would never be NULL. */
3846 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3852 if (h
->got
.offset
!= (bfd_vma
) -1)
3856 Elf_Internal_Rela rel
;
3859 /* This symbol has an entry in the global offset table. Set it
3861 sgot
= bfd_get_section_by_name (dynobj
, ".got");
3862 srel
= bfd_get_section_by_name (dynobj
, ".rel.got");
3863 BFD_ASSERT (sgot
!= NULL
&& srel
!= NULL
);
3865 rel
.r_offset
= (sgot
->output_section
->vma
3866 + sgot
->output_offset
3867 + (h
->got
.offset
&~ (bfd_vma
) 1));
3869 /* If this is a static link, or it is a -Bsymbolic link and the
3870 symbol is defined locally or was forced to be local because
3871 of a version file, we just want to emit a RELATIVE reloc.
3872 The entry in the global offset table will already have been
3873 initialized in the relocate_section function. */
3875 && SYMBOL_REFERENCES_LOCAL (info
, h
))
3877 BFD_ASSERT((h
->got
.offset
& 1) != 0);
3878 rel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
3882 BFD_ASSERT((h
->got
.offset
& 1) == 0);
3883 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ h
->got
.offset
);
3884 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_GLOB_DAT
);
3887 loc
= srel
->contents
+ srel
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3888 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3891 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_COPY
) != 0)
3894 Elf_Internal_Rela rel
;
3897 /* This symbol needs a copy reloc. Set it up. */
3898 BFD_ASSERT (h
->dynindx
!= -1
3899 && (h
->root
.type
== bfd_link_hash_defined
3900 || h
->root
.type
== bfd_link_hash_defweak
));
3902 s
= bfd_get_section_by_name (h
->root
.u
.def
.section
->owner
,
3904 BFD_ASSERT (s
!= NULL
);
3906 rel
.r_offset
= (h
->root
.u
.def
.value
3907 + h
->root
.u
.def
.section
->output_section
->vma
3908 + h
->root
.u
.def
.section
->output_offset
);
3909 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_COPY
);
3910 loc
= s
->contents
+ s
->reloc_count
++ * sizeof (Elf32_External_Rel
);
3911 bfd_elf32_swap_reloc_out (output_bfd
, &rel
, loc
);
3914 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3915 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3916 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
3917 sym
->st_shndx
= SHN_ABS
;
3922 /* Finish up the dynamic sections. */
3925 elf32_arm_finish_dynamic_sections (output_bfd
, info
)
3927 struct bfd_link_info
* info
;
3933 dynobj
= elf_hash_table (info
)->dynobj
;
3935 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
3936 BFD_ASSERT (sgot
!= NULL
);
3937 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3939 if (elf_hash_table (info
)->dynamic_sections_created
)
3942 Elf32_External_Dyn
*dyncon
, *dynconend
;
3944 splt
= bfd_get_section_by_name (dynobj
, ".plt");
3945 BFD_ASSERT (splt
!= NULL
&& sdyn
!= NULL
);
3947 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3948 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->_raw_size
);
3950 for (; dyncon
< dynconend
; dyncon
++)
3952 Elf_Internal_Dyn dyn
;
3956 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3969 s
= bfd_get_section_by_name (output_bfd
, name
);
3970 BFD_ASSERT (s
!= NULL
);
3971 dyn
.d_un
.d_ptr
= s
->vma
;
3972 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3976 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
3977 BFD_ASSERT (s
!= NULL
);
3978 if (s
->_cooked_size
!= 0)
3979 dyn
.d_un
.d_val
= s
->_cooked_size
;
3981 dyn
.d_un
.d_val
= s
->_raw_size
;
3982 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3986 /* My reading of the SVR4 ABI indicates that the
3987 procedure linkage table relocs (DT_JMPREL) should be
3988 included in the overall relocs (DT_REL). This is
3989 what Solaris does. However, UnixWare can not handle
3990 that case. Therefore, we override the DT_RELSZ entry
3991 here to make it not include the JMPREL relocs. Since
3992 the linker script arranges for .rel.plt to follow all
3993 other relocation sections, we don't have to worry
3994 about changing the DT_REL entry. */
3995 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
3998 if (s
->_cooked_size
!= 0)
3999 dyn
.d_un
.d_val
-= s
->_cooked_size
;
4001 dyn
.d_un
.d_val
-= s
->_raw_size
;
4003 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4006 /* Set the bottom bit of DT_INIT/FINI if the
4007 corresponding function is Thumb. */
4009 name
= info
->init_function
;
4012 name
= info
->fini_function
;
4014 /* If it wasn't set by elf_bfd_final_link
4015 then there is nothing to adjust. */
4016 if (dyn
.d_un
.d_val
!= 0)
4018 struct elf_link_hash_entry
* eh
;
4020 eh
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4021 FALSE
, FALSE
, TRUE
);
4022 if (eh
!= (struct elf_link_hash_entry
*) NULL
4023 && ELF_ST_TYPE (eh
->type
) == STT_ARM_TFUNC
)
4025 dyn
.d_un
.d_val
|= 1;
4026 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
4033 /* Fill in the first entry in the procedure linkage table. */
4034 if (splt
->_raw_size
> 0)
4036 bfd_vma got_displacement
;
4038 /* Calculate the displacement between the PLT slot and &GOT[0]. */
4039 got_displacement
= (sgot
->output_section
->vma
4040 + sgot
->output_offset
4041 - splt
->output_section
->vma
4042 - splt
->output_offset
4045 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[0], splt
->contents
+ 0);
4046 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[1], splt
->contents
+ 4);
4047 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[2], splt
->contents
+ 8);
4048 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[3], splt
->contents
+ 12);
4049 #ifdef FOUR_WORD_PLT
4050 /* The displacement value goes in the otherwise-unused last word of
4051 the second entry. */
4052 bfd_put_32 (output_bfd
, got_displacement
, splt
->contents
+ 28);
4054 bfd_put_32 (output_bfd
, got_displacement
, splt
->contents
+ 16);
4058 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4059 really seem like the right value. */
4060 elf_section_data (splt
->output_section
)->this_hdr
.sh_entsize
= 4;
4063 /* Fill in the first three entries in the global offset table. */
4064 if (sgot
->_raw_size
> 0)
4067 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
);
4069 bfd_put_32 (output_bfd
,
4070 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
4072 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 4);
4073 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 8);
4076 elf_section_data (sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
4082 elf32_arm_post_process_headers (abfd
, link_info
)
4084 struct bfd_link_info
* link_info ATTRIBUTE_UNUSED
;
4086 Elf_Internal_Ehdr
* i_ehdrp
; /* ELF file header, internal form. */
4087 struct elf32_arm_link_hash_table
*globals
;
4089 i_ehdrp
= elf_elfheader (abfd
);
4091 i_ehdrp
->e_ident
[EI_OSABI
] = ARM_ELF_OS_ABI_VERSION
;
4092 i_ehdrp
->e_ident
[EI_ABIVERSION
] = ARM_ELF_ABI_VERSION
;
4096 globals
= elf32_arm_hash_table (link_info
);
4097 if (globals
->byteswap_code
)
4098 i_ehdrp
->e_flags
|= EF_ARM_BE8
;
4102 static enum elf_reloc_type_class
4103 elf32_arm_reloc_type_class (rela
)
4104 const Elf_Internal_Rela
*rela
;
4106 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4108 case R_ARM_RELATIVE
:
4109 return reloc_class_relative
;
4110 case R_ARM_JUMP_SLOT
:
4111 return reloc_class_plt
;
4113 return reloc_class_copy
;
4115 return reloc_class_normal
;
4119 static bfd_boolean elf32_arm_section_flags
PARAMS ((flagword
*, Elf_Internal_Shdr
*));
4120 static void elf32_arm_final_write_processing
PARAMS ((bfd
*, bfd_boolean
));
4122 /* Set the right machine number for an Arm ELF file. */
4125 elf32_arm_section_flags (flags
, hdr
)
4127 Elf_Internal_Shdr
*hdr
;
4129 if (hdr
->sh_type
== SHT_NOTE
)
4130 *flags
|= SEC_LINK_ONCE
| SEC_LINK_DUPLICATES_SAME_CONTENTS
;
4136 elf32_arm_final_write_processing (abfd
, linker
)
4138 bfd_boolean linker ATTRIBUTE_UNUSED
;
4140 bfd_arm_update_notes (abfd
, ARM_NOTE_SECTION
);
4144 /* Called for each symbol. Builds a section map based on mapping symbols.
4145 Does not alter any of the symbols. */
4148 elf32_arm_output_symbol_hook (struct bfd_link_info
*info
,
4150 Elf_Internal_Sym
*elfsym
,
4151 asection
*input_sec
,
4152 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
)
4155 elf32_arm_section_map
*map
;
4156 struct elf32_arm_link_hash_table
*globals
;
4158 /* Only do this on final link. */
4159 if (info
->relocatable
)
4162 /* Only build a map if we need to byteswap code. */
4163 globals
= elf32_arm_hash_table (info
);
4164 if (!globals
->byteswap_code
)
4167 /* We only want mapping symbols. */
4175 mapcount
= ++(elf32_arm_section_data (input_sec
)->mapcount
);
4176 map
= elf32_arm_section_data (input_sec
)->map
;
4177 /* TODO: This may be inefficient, but we probably don't usually have many
4178 mapping symbols per section. */
4179 map
= bfd_realloc (map
, mapcount
* sizeof (elf32_arm_section_map
));
4180 elf32_arm_section_data (input_sec
)->map
= map
;
4182 map
[mapcount
- 1].vma
= elfsym
->st_value
;
4183 map
[mapcount
- 1].type
= name
[1];
4188 /* Allocate target specific section data. */
4191 elf32_arm_new_section_hook (bfd
*abfd
, asection
*sec
)
4193 struct _arm_elf_section_data
*sdata
;
4194 bfd_size_type amt
= sizeof (*sdata
);
4196 sdata
= bfd_zalloc (abfd
, amt
);
4199 sec
->used_by_bfd
= sdata
;
4201 return _bfd_elf_new_section_hook (abfd
, sec
);
4205 /* Used to order a list of mapping symbols by address. */
4208 elf32_arm_compare_mapping (const void * a
, const void * b
)
4210 return ((const elf32_arm_section_map
*) a
)->vma
4211 > ((const elf32_arm_section_map
*) b
)->vma
;
4215 /* Do code byteswapping. Return FALSE afterwards so that the section is
4216 written out as normal. */
4219 elf32_arm_write_section (bfd
*output_bfd ATTRIBUTE_UNUSED
, asection
*sec
,
4223 elf32_arm_section_map
*map
;
4230 mapcount
= elf32_arm_section_data (sec
)->mapcount
;
4231 map
= elf32_arm_section_data (sec
)->map
;
4236 qsort (map
, mapcount
, sizeof (elf32_arm_section_map
),
4237 elf32_arm_compare_mapping
);
4239 offset
= sec
->output_section
->vma
+ sec
->output_offset
;
4240 ptr
= map
[0].vma
- offset
;
4241 for (i
= 0; i
< mapcount
; i
++)
4243 if (i
== mapcount
- 1)
4244 end
= bfd_section_size (output_bfd
, sec
);
4246 end
= map
[i
+ 1].vma
- offset
;
4248 switch (map
[i
].type
)
4251 /* Byte swap code words. */
4252 while (ptr
+ 3 < end
)
4254 tmp
= contents
[ptr
];
4255 contents
[ptr
] = contents
[ptr
+ 3];
4256 contents
[ptr
+ 3] = tmp
;
4257 tmp
= contents
[ptr
+ 1];
4258 contents
[ptr
+ 1] = contents
[ptr
+ 2];
4259 contents
[ptr
+ 2] = tmp
;
4265 /* Byte swap code halfwords. */
4266 while (ptr
+ 1 < end
)
4268 tmp
= contents
[ptr
];
4269 contents
[ptr
] = contents
[ptr
+ 1];
4270 contents
[ptr
+ 1] = tmp
;
4276 /* Leave data alone. */
4285 #define ELF_ARCH bfd_arch_arm
4286 #define ELF_MACHINE_CODE EM_ARM
4287 #ifdef __QNXTARGET__
4288 #define ELF_MAXPAGESIZE 0x1000
4290 #define ELF_MAXPAGESIZE 0x8000
4293 #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
4294 #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
4295 #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
4296 #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data
4297 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create
4298 #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
4299 #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line
4300 #define bfd_elf32_new_section_hook elf32_arm_new_section_hook
4302 #define elf_backend_get_symbol_type elf32_arm_get_symbol_type
4303 #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook
4304 #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook
4305 #define elf_backend_check_relocs elf32_arm_check_relocs
4306 #define elf_backend_relocate_section elf32_arm_relocate_section
4307 #define elf_backend_write_section elf32_arm_write_section
4308 #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol
4309 #define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections
4310 #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol
4311 #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections
4312 #define elf_backend_link_output_symbol_hook elf32_arm_output_symbol_hook
4313 #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections
4314 #define elf_backend_post_process_headers elf32_arm_post_process_headers
4315 #define elf_backend_reloc_type_class elf32_arm_reloc_type_class
4316 #define elf_backend_object_p elf32_arm_object_p
4317 #define elf_backend_section_flags elf32_arm_section_flags
4318 #define elf_backend_final_write_processing elf32_arm_final_write_processing
4319 #define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol
4321 #define elf_backend_can_refcount 1
4322 #define elf_backend_can_gc_sections 1
4323 #define elf_backend_plt_readonly 1
4324 #define elf_backend_want_got_plt 1
4325 #define elf_backend_want_plt_sym 0
4327 #define elf_backend_rela_normal 1
4330 #define elf_backend_got_header_size 12
4332 #include "elf32-target.h"