1 /* 32-bit ELF support for ARM
2 Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 typedef unsigned long int insn32
;
21 typedef unsigned short int insn16
;
23 static boolean elf32_arm_set_private_flags
24 PARAMS ((bfd
*, flagword
));
25 static boolean elf32_arm_copy_private_bfd_data
26 PARAMS ((bfd
*, bfd
*));
27 static boolean elf32_arm_merge_private_bfd_data
28 PARAMS ((bfd
*, bfd
*));
29 static boolean elf32_arm_print_private_bfd_data
30 PARAMS ((bfd
*, PTR
));
31 static int elf32_arm_get_symbol_type
32 PARAMS (( Elf_Internal_Sym
*, int));
33 static struct bfd_link_hash_table
*elf32_arm_link_hash_table_create
35 static bfd_reloc_status_type elf32_arm_final_link_relocate
36 PARAMS ((reloc_howto_type
*, bfd
*, bfd
*, asection
*, bfd_byte
*,
37 Elf_Internal_Rela
*, bfd_vma
, struct bfd_link_info
*, asection
*,
38 const char *, int, struct elf_link_hash_entry
*));
39 static insn32 insert_thumb_branch
40 PARAMS ((insn32
, int));
41 static struct elf_link_hash_entry
*find_thumb_glue
42 PARAMS ((struct bfd_link_info
*, const char *, bfd
*));
43 static struct elf_link_hash_entry
*find_arm_glue
44 PARAMS ((struct bfd_link_info
*, const char *, bfd
*));
45 static void record_arm_to_thumb_glue
46 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
47 static void record_thumb_to_arm_glue
48 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
49 static void elf32_arm_post_process_headers
50 PARAMS ((bfd
*, struct bfd_link_info
*));
51 static int elf32_arm_to_thumb_stub
52 PARAMS ((struct bfd_link_info
*, const char *, bfd
*, bfd
*, asection
*,
53 bfd_byte
*, asection
*, bfd_vma
, bfd_signed_vma
, bfd_vma
));
54 static int elf32_thumb_to_arm_stub
55 PARAMS ((struct bfd_link_info
*, const char *, bfd
*, bfd
*, asection
*,
56 bfd_byte
*, asection
*, bfd_vma
, bfd_signed_vma
, bfd_vma
));
57 static boolean elf32_arm_relocate_section
58 PARAMS ((bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
59 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**));
60 static asection
* elf32_arm_gc_mark_hook
61 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
62 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
63 static boolean elf32_arm_gc_sweep_hook
64 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
65 const Elf_Internal_Rela
*));
66 static boolean elf32_arm_check_relocs
67 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
68 const Elf_Internal_Rela
*));
69 static boolean elf32_arm_find_nearest_line
70 PARAMS ((bfd
*, asection
*, asymbol
**, bfd_vma
, const char **,
71 const char **, unsigned int *));
72 static boolean elf32_arm_adjust_dynamic_symbol
73 PARAMS ((struct bfd_link_info
*, struct elf_link_hash_entry
*));
74 static boolean elf32_arm_size_dynamic_sections
75 PARAMS ((bfd
*, struct bfd_link_info
*));
76 static boolean elf32_arm_finish_dynamic_symbol
77 PARAMS ((bfd
*, struct bfd_link_info
*, struct elf_link_hash_entry
*,
79 static boolean elf32_arm_finish_dynamic_sections
80 PARAMS ((bfd
*, struct bfd_link_info
*));
81 static struct bfd_hash_entry
* elf32_arm_link_hash_newfunc
82 PARAMS ((struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *));
84 static void arm_add_to_rel
85 PARAMS ((bfd
*, bfd_byte
*, reloc_howto_type
*, bfd_signed_vma
));
88 boolean bfd_elf32_arm_allocate_interworking_sections
89 PARAMS ((struct bfd_link_info
*));
90 boolean bfd_elf32_arm_get_bfd_for_interworking
91 PARAMS ((bfd
*, struct bfd_link_info
*));
92 boolean bfd_elf32_arm_process_before_allocation
93 PARAMS ((bfd
*, struct bfd_link_info
*, int));
94 static enum elf_reloc_type_class elf32_arm_reloc_type_class
95 PARAMS ((const Elf_Internal_Rela
*));
97 #define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK)
99 /* The linker script knows the section names for placement.
100 The entry_names are used to do simple name mangling on the stubs.
101 Given a function name, and its type, the stub can be found. The
102 name can be changed. The only requirement is the %s be present. */
103 #define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t"
104 #define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb"
106 #define ARM2THUMB_GLUE_SECTION_NAME ".glue_7"
107 #define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm"
109 /* The name of the dynamic interpreter. This is put in the .interp
111 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1"
113 /* The size in bytes of an entry in the procedure linkage table. */
114 #define PLT_ENTRY_SIZE 16
116 /* The first entry in a procedure linkage table looks like
117 this. It is set up so that any shared library function that is
118 called before the relocation has been set up calls the dynamic
120 static const bfd_vma elf32_arm_plt0_entry
[PLT_ENTRY_SIZE
/ 4] =
122 0xe52de004, /* str lr, [sp, #-4]! */
123 0xe59fe010, /* ldr lr, [pc, #16] */
124 0xe08fe00e, /* add lr, pc, lr */
125 0xe5bef008 /* ldr pc, [lr, #8]! */
128 /* Subsequent entries in a procedure linkage table look like
130 static const bfd_vma elf32_arm_plt_entry
[PLT_ENTRY_SIZE
/ 4] =
132 0xe59fc004, /* ldr ip, [pc, #4] */
133 0xe08fc00c, /* add ip, pc, ip */
134 0xe59cf000, /* ldr pc, [ip] */
135 0x00000000 /* offset to symbol in got */
138 /* The ARM linker needs to keep track of the number of relocs that it
139 decides to copy in check_relocs for each symbol. This is so that
140 it can discard PC relative relocs if it doesn't need them when
141 linking with -Bsymbolic. We store the information in a field
142 extending the regular ELF linker hash table. */
144 /* This structure keeps track of the number of PC relative relocs we
145 have copied for a given symbol. */
146 struct elf32_arm_pcrel_relocs_copied
149 struct elf32_arm_pcrel_relocs_copied
* next
;
150 /* A section in dynobj. */
152 /* Number of relocs copied in this section. */
156 /* Arm ELF linker hash entry. */
157 struct elf32_arm_link_hash_entry
159 struct elf_link_hash_entry root
;
161 /* Number of PC relative relocs copied for this symbol. */
162 struct elf32_arm_pcrel_relocs_copied
* pcrel_relocs_copied
;
165 /* Declare this now that the above structures are defined. */
166 static boolean elf32_arm_discard_copies
167 PARAMS ((struct elf32_arm_link_hash_entry
*, PTR
));
169 /* Traverse an arm ELF linker hash table. */
170 #define elf32_arm_link_hash_traverse(table, func, info) \
171 (elf_link_hash_traverse \
173 (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \
176 /* Get the ARM elf linker hash table from a link_info structure. */
177 #define elf32_arm_hash_table(info) \
178 ((struct elf32_arm_link_hash_table *) ((info)->hash))
180 /* ARM ELF linker hash table. */
181 struct elf32_arm_link_hash_table
183 /* The main hash table. */
184 struct elf_link_hash_table root
;
186 /* The size in bytes of the section containg the Thumb-to-ARM glue. */
187 bfd_size_type thumb_glue_size
;
189 /* The size in bytes of the section containg the ARM-to-Thumb glue. */
190 bfd_size_type arm_glue_size
;
192 /* An arbitary input BFD chosen to hold the glue sections. */
193 bfd
* bfd_of_glue_owner
;
195 /* A boolean indicating whether knowledge of the ARM's pipeline
196 length should be applied by the linker. */
197 int no_pipeline_knowledge
;
200 /* Create an entry in an ARM ELF linker hash table. */
202 static struct bfd_hash_entry
*
203 elf32_arm_link_hash_newfunc (entry
, table
, string
)
204 struct bfd_hash_entry
* entry
;
205 struct bfd_hash_table
* table
;
208 struct elf32_arm_link_hash_entry
* ret
=
209 (struct elf32_arm_link_hash_entry
*) entry
;
211 /* Allocate the structure if it has not already been allocated by a
213 if (ret
== (struct elf32_arm_link_hash_entry
*) NULL
)
214 ret
= ((struct elf32_arm_link_hash_entry
*)
215 bfd_hash_allocate (table
,
216 sizeof (struct elf32_arm_link_hash_entry
)));
217 if (ret
== (struct elf32_arm_link_hash_entry
*) NULL
)
218 return (struct bfd_hash_entry
*) ret
;
220 /* Call the allocation method of the superclass. */
221 ret
= ((struct elf32_arm_link_hash_entry
*)
222 _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry
*) ret
,
224 if (ret
!= (struct elf32_arm_link_hash_entry
*) NULL
)
225 ret
->pcrel_relocs_copied
= NULL
;
227 return (struct bfd_hash_entry
*) ret
;
230 /* Create an ARM elf linker hash table. */
232 static struct bfd_link_hash_table
*
233 elf32_arm_link_hash_table_create (abfd
)
236 struct elf32_arm_link_hash_table
*ret
;
237 bfd_size_type amt
= sizeof (struct elf32_arm_link_hash_table
);
239 ret
= (struct elf32_arm_link_hash_table
*) bfd_alloc (abfd
, amt
);
240 if (ret
== (struct elf32_arm_link_hash_table
*) NULL
)
243 if (!_bfd_elf_link_hash_table_init (&ret
->root
, abfd
,
244 elf32_arm_link_hash_newfunc
))
246 bfd_release (abfd
, ret
);
250 ret
->thumb_glue_size
= 0;
251 ret
->arm_glue_size
= 0;
252 ret
->bfd_of_glue_owner
= NULL
;
253 ret
->no_pipeline_knowledge
= 0;
255 return &ret
->root
.root
;
258 /* Locate the Thumb encoded calling stub for NAME. */
260 static struct elf_link_hash_entry
*
261 find_thumb_glue (link_info
, name
, input_bfd
)
262 struct bfd_link_info
*link_info
;
267 struct elf_link_hash_entry
*hash
;
268 struct elf32_arm_link_hash_table
*hash_table
;
270 /* We need a pointer to the armelf specific hash table. */
271 hash_table
= elf32_arm_hash_table (link_info
);
273 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
274 + strlen (THUMB2ARM_GLUE_ENTRY_NAME
) + 1);
276 BFD_ASSERT (tmp_name
);
278 sprintf (tmp_name
, THUMB2ARM_GLUE_ENTRY_NAME
, name
);
280 hash
= elf_link_hash_lookup
281 (&(hash_table
)->root
, tmp_name
, false, false, true);
284 /* xgettext:c-format */
285 (*_bfd_error_handler
) (_("%s: unable to find THUMB glue '%s' for `%s'"),
286 bfd_archive_filename (input_bfd
), tmp_name
, name
);
293 /* Locate the ARM encoded calling stub for NAME. */
295 static struct elf_link_hash_entry
*
296 find_arm_glue (link_info
, name
, input_bfd
)
297 struct bfd_link_info
*link_info
;
302 struct elf_link_hash_entry
*myh
;
303 struct elf32_arm_link_hash_table
*hash_table
;
305 /* We need a pointer to the elfarm specific hash table. */
306 hash_table
= elf32_arm_hash_table (link_info
);
308 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
309 + strlen (ARM2THUMB_GLUE_ENTRY_NAME
) + 1);
311 BFD_ASSERT (tmp_name
);
313 sprintf (tmp_name
, ARM2THUMB_GLUE_ENTRY_NAME
, name
);
315 myh
= elf_link_hash_lookup
316 (&(hash_table
)->root
, tmp_name
, false, false, true);
319 /* xgettext:c-format */
320 (*_bfd_error_handler
) (_("%s: unable to find ARM glue '%s' for `%s'"),
321 bfd_archive_filename (input_bfd
), tmp_name
, name
);
335 .word func @ behave as if you saw a ARM_32 reloc. */
337 #define ARM2THUMB_GLUE_SIZE 12
338 static const insn32 a2t1_ldr_insn
= 0xe59fc000;
339 static const insn32 a2t2_bx_r12_insn
= 0xe12fff1c;
340 static const insn32 a2t3_func_addr_insn
= 0x00000001;
342 /* Thumb->ARM: Thumb->(non-interworking aware) ARM
346 __func_from_thumb: __func_from_thumb:
348 nop ldr r6, __func_addr
350 __func_change_to_arm: bx r6
352 __func_back_to_thumb:
358 #define THUMB2ARM_GLUE_SIZE 8
359 static const insn16 t2a1_bx_pc_insn
= 0x4778;
360 static const insn16 t2a2_noop_insn
= 0x46c0;
361 static const insn32 t2a3_b_insn
= 0xea000000;
363 static const insn16 t2a1_push_insn
= 0xb540;
364 static const insn16 t2a2_ldr_insn
= 0x4e03;
365 static const insn16 t2a3_mov_insn
= 0x46fe;
366 static const insn16 t2a4_bx_insn
= 0x4730;
367 static const insn32 t2a5_pop_insn
= 0xe8bd4040;
368 static const insn32 t2a6_bx_insn
= 0xe12fff1e;
371 bfd_elf32_arm_allocate_interworking_sections (info
)
372 struct bfd_link_info
* info
;
376 struct elf32_arm_link_hash_table
* globals
;
378 globals
= elf32_arm_hash_table (info
);
380 BFD_ASSERT (globals
!= NULL
);
382 if (globals
->arm_glue_size
!= 0)
384 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
386 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
387 ARM2THUMB_GLUE_SECTION_NAME
);
389 BFD_ASSERT (s
!= NULL
);
391 foo
= (bfd_byte
*) bfd_alloc (globals
->bfd_of_glue_owner
,
392 globals
->arm_glue_size
);
394 s
->_raw_size
= s
->_cooked_size
= globals
->arm_glue_size
;
398 if (globals
->thumb_glue_size
!= 0)
400 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
402 s
= bfd_get_section_by_name
403 (globals
->bfd_of_glue_owner
, THUMB2ARM_GLUE_SECTION_NAME
);
405 BFD_ASSERT (s
!= NULL
);
407 foo
= (bfd_byte
*) bfd_alloc (globals
->bfd_of_glue_owner
,
408 globals
->thumb_glue_size
);
410 s
->_raw_size
= s
->_cooked_size
= globals
->thumb_glue_size
;
418 record_arm_to_thumb_glue (link_info
, h
)
419 struct bfd_link_info
* link_info
;
420 struct elf_link_hash_entry
* h
;
422 const char * name
= h
->root
.root
.string
;
425 struct elf_link_hash_entry
* myh
;
426 struct elf32_arm_link_hash_table
* globals
;
429 globals
= elf32_arm_hash_table (link_info
);
431 BFD_ASSERT (globals
!= NULL
);
432 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
434 s
= bfd_get_section_by_name
435 (globals
->bfd_of_glue_owner
, ARM2THUMB_GLUE_SECTION_NAME
);
437 BFD_ASSERT (s
!= NULL
);
439 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
440 + strlen (ARM2THUMB_GLUE_ENTRY_NAME
) + 1);
442 BFD_ASSERT (tmp_name
);
444 sprintf (tmp_name
, ARM2THUMB_GLUE_ENTRY_NAME
, name
);
446 myh
= elf_link_hash_lookup
447 (&(globals
)->root
, tmp_name
, false, false, true);
451 /* We've already seen this guy. */
456 /* The only trick here is using hash_table->arm_glue_size as the value. Even
457 though the section isn't allocated yet, this is where we will be putting
459 val
= globals
->arm_glue_size
+ 1;
460 _bfd_generic_link_add_one_symbol (link_info
, globals
->bfd_of_glue_owner
,
461 tmp_name
, BSF_GLOBAL
, s
, val
,
463 (struct bfd_link_hash_entry
**) &myh
);
467 globals
->arm_glue_size
+= ARM2THUMB_GLUE_SIZE
;
473 record_thumb_to_arm_glue (link_info
, h
)
474 struct bfd_link_info
*link_info
;
475 struct elf_link_hash_entry
*h
;
477 const char *name
= h
->root
.root
.string
;
480 struct elf_link_hash_entry
*myh
;
481 struct elf32_arm_link_hash_table
*hash_table
;
485 hash_table
= elf32_arm_hash_table (link_info
);
487 BFD_ASSERT (hash_table
!= NULL
);
488 BFD_ASSERT (hash_table
->bfd_of_glue_owner
!= NULL
);
490 s
= bfd_get_section_by_name
491 (hash_table
->bfd_of_glue_owner
, THUMB2ARM_GLUE_SECTION_NAME
);
493 BFD_ASSERT (s
!= NULL
);
495 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
496 + strlen (THUMB2ARM_GLUE_ENTRY_NAME
) + 1);
498 BFD_ASSERT (tmp_name
);
500 sprintf (tmp_name
, THUMB2ARM_GLUE_ENTRY_NAME
, name
);
502 myh
= elf_link_hash_lookup
503 (&(hash_table
)->root
, tmp_name
, false, false, true);
507 /* We've already seen this guy. */
512 val
= hash_table
->thumb_glue_size
+ 1;
513 _bfd_generic_link_add_one_symbol (link_info
, hash_table
->bfd_of_glue_owner
,
514 tmp_name
, BSF_GLOBAL
, s
, val
,
516 (struct bfd_link_hash_entry
**) &myh
);
518 /* If we mark it 'Thumb', the disassembler will do a better job. */
519 bind
= ELF_ST_BIND (myh
->type
);
520 myh
->type
= ELF_ST_INFO (bind
, STT_ARM_TFUNC
);
524 #define CHANGE_TO_ARM "__%s_change_to_arm"
525 #define BACK_FROM_ARM "__%s_back_from_arm"
527 /* Allocate another symbol to mark where we switch to Arm mode. */
528 tmp_name
= (char *) bfd_malloc ((bfd_size_type
) strlen (name
)
529 + strlen (CHANGE_TO_ARM
) + 1);
531 BFD_ASSERT (tmp_name
);
533 sprintf (tmp_name
, CHANGE_TO_ARM
, name
);
537 val
= hash_table
->thumb_glue_size
+ 4,
538 _bfd_generic_link_add_one_symbol (link_info
, hash_table
->bfd_of_glue_owner
,
539 tmp_name
, BSF_LOCAL
, s
, val
,
541 (struct bfd_link_hash_entry
**) &myh
);
545 hash_table
->thumb_glue_size
+= THUMB2ARM_GLUE_SIZE
;
550 /* Select a BFD to be used to hold the sections used by the glue code.
551 This function is called from the linker scripts in ld/emultempl/
555 bfd_elf32_arm_get_bfd_for_interworking (abfd
, info
)
557 struct bfd_link_info
*info
;
559 struct elf32_arm_link_hash_table
*globals
;
563 /* If we are only performing a partial link do not bother
564 getting a bfd to hold the glue. */
565 if (info
->relocateable
)
568 globals
= elf32_arm_hash_table (info
);
570 BFD_ASSERT (globals
!= NULL
);
572 if (globals
->bfd_of_glue_owner
!= NULL
)
575 sec
= bfd_get_section_by_name (abfd
, ARM2THUMB_GLUE_SECTION_NAME
);
579 /* Note: we do not include the flag SEC_LINKER_CREATED, as this
580 will prevent elf_link_input_bfd() from processing the contents
582 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_CODE
| SEC_READONLY
;
584 sec
= bfd_make_section (abfd
, ARM2THUMB_GLUE_SECTION_NAME
);
587 || !bfd_set_section_flags (abfd
, sec
, flags
)
588 || !bfd_set_section_alignment (abfd
, sec
, 2))
591 /* Set the gc mark to prevent the section from being removed by garbage
592 collection, despite the fact that no relocs refer to this section. */
596 sec
= bfd_get_section_by_name (abfd
, THUMB2ARM_GLUE_SECTION_NAME
);
600 flags
= SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
| SEC_CODE
| SEC_READONLY
;
602 sec
= bfd_make_section (abfd
, THUMB2ARM_GLUE_SECTION_NAME
);
605 || !bfd_set_section_flags (abfd
, sec
, flags
)
606 || !bfd_set_section_alignment (abfd
, sec
, 2))
612 /* Save the bfd for later use. */
613 globals
->bfd_of_glue_owner
= abfd
;
619 bfd_elf32_arm_process_before_allocation (abfd
, link_info
, no_pipeline_knowledge
)
621 struct bfd_link_info
*link_info
;
622 int no_pipeline_knowledge
;
624 Elf_Internal_Shdr
*symtab_hdr
;
625 Elf_Internal_Rela
*free_relocs
= NULL
;
626 Elf_Internal_Rela
*irel
, *irelend
;
627 bfd_byte
*contents
= NULL
;
628 bfd_byte
*free_contents
= NULL
;
629 Elf32_External_Sym
*extsyms
= NULL
;
630 Elf32_External_Sym
*free_extsyms
= NULL
;
633 struct elf32_arm_link_hash_table
*globals
;
635 /* If we are only performing a partial link do not bother
636 to construct any glue. */
637 if (link_info
->relocateable
)
640 /* Here we have a bfd that is to be included on the link. We have a hook
641 to do reloc rummaging, before section sizes are nailed down. */
642 globals
= elf32_arm_hash_table (link_info
);
644 BFD_ASSERT (globals
!= NULL
);
645 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
647 globals
->no_pipeline_knowledge
= no_pipeline_knowledge
;
649 /* Rummage around all the relocs and map the glue vectors. */
650 sec
= abfd
->sections
;
655 for (; sec
!= NULL
; sec
= sec
->next
)
657 if (sec
->reloc_count
== 0)
660 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
662 /* Load the relocs. */
663 irel
= (_bfd_elf32_link_read_relocs (abfd
, sec
, (PTR
) NULL
,
664 (Elf_Internal_Rela
*) NULL
, false));
666 BFD_ASSERT (irel
!= 0);
668 irelend
= irel
+ sec
->reloc_count
;
669 for (; irel
< irelend
; irel
++)
672 unsigned long r_index
;
674 struct elf_link_hash_entry
*h
;
676 r_type
= ELF32_R_TYPE (irel
->r_info
);
677 r_index
= ELF32_R_SYM (irel
->r_info
);
679 /* These are the only relocation types we care about. */
680 if ( r_type
!= R_ARM_PC24
681 && r_type
!= R_ARM_THM_PC22
)
684 /* Get the section contents if we haven't done so already. */
685 if (contents
== NULL
)
687 /* Get cached copy if it exists. */
688 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
689 contents
= elf_section_data (sec
)->this_hdr
.contents
;
692 /* Go get them off disk. */
693 contents
= (bfd_byte
*) bfd_malloc (sec
->_raw_size
);
694 if (contents
== NULL
)
697 free_contents
= contents
;
699 if (!bfd_get_section_contents (abfd
, sec
, contents
,
700 (file_ptr
) 0, sec
->_raw_size
))
705 /* Read this BFD's symbols if we haven't done so already. */
708 /* Get cached copy if it exists. */
709 if (symtab_hdr
->contents
!= NULL
)
710 extsyms
= (Elf32_External_Sym
*) symtab_hdr
->contents
;
713 /* Go get them off disk. */
714 extsyms
= ((Elf32_External_Sym
*)
715 bfd_malloc (symtab_hdr
->sh_size
));
719 free_extsyms
= extsyms
;
721 if (bfd_seek (abfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
722 || (bfd_bread (extsyms
, symtab_hdr
->sh_size
, abfd
)
723 != symtab_hdr
->sh_size
))
728 /* If the relocation is not against a symbol it cannot concern us. */
731 /* We don't care about local symbols. */
732 if (r_index
< symtab_hdr
->sh_info
)
735 /* This is an external symbol. */
736 r_index
-= symtab_hdr
->sh_info
;
737 h
= (struct elf_link_hash_entry
*)
738 elf_sym_hashes (abfd
)[r_index
];
740 /* If the relocation is against a static symbol it must be within
741 the current section and so cannot be a cross ARM/Thumb relocation. */
748 /* This one is a call from arm code. We need to look up
749 the target of the call. If it is a thumb target, we
751 if (ELF_ST_TYPE(h
->type
) == STT_ARM_TFUNC
)
752 record_arm_to_thumb_glue (link_info
, h
);
756 /* This one is a call from thumb code. We look
757 up the target of the call. If it is not a thumb
758 target, we insert glue. */
759 if (ELF_ST_TYPE (h
->type
) != STT_ARM_TFUNC
)
760 record_thumb_to_arm_glue (link_info
, h
);
772 if (free_relocs
!= NULL
)
774 if (free_contents
!= NULL
)
775 free (free_contents
);
776 if (free_extsyms
!= NULL
)
782 /* The thumb form of a long branch is a bit finicky, because the offset
783 encoding is split over two fields, each in it's own instruction. They
784 can occur in any order. So given a thumb form of long branch, and an
785 offset, insert the offset into the thumb branch and return finished
788 It takes two thumb instructions to encode the target address. Each has
789 11 bits to invest. The upper 11 bits are stored in one (identifed by
790 H-0.. see below), the lower 11 bits are stored in the other (identified
793 Combine together and shifted left by 1 (it's a half word address) and
797 H-0, upper address-0 = 000
799 H-1, lower address-0 = 800
801 They can be ordered either way, but the arm tools I've seen always put
802 the lower one first. It probably doesn't matter. krk@cygnus.com
804 XXX: Actually the order does matter. The second instruction (H-1)
805 moves the computed address into the PC, so it must be the second one
806 in the sequence. The problem, however is that whilst little endian code
807 stores the instructions in HI then LOW order, big endian code does the
808 reverse. nickc@cygnus.com. */
810 #define LOW_HI_ORDER 0xF800F000
811 #define HI_LOW_ORDER 0xF000F800
814 insert_thumb_branch (br_insn
, rel_off
)
818 unsigned int low_bits
;
819 unsigned int high_bits
;
821 BFD_ASSERT ((rel_off
& 1) != 1);
823 rel_off
>>= 1; /* Half word aligned address. */
824 low_bits
= rel_off
& 0x000007FF; /* The bottom 11 bits. */
825 high_bits
= (rel_off
>> 11) & 0x000007FF; /* The top 11 bits. */
827 if ((br_insn
& LOW_HI_ORDER
) == LOW_HI_ORDER
)
828 br_insn
= LOW_HI_ORDER
| (low_bits
<< 16) | high_bits
;
829 else if ((br_insn
& HI_LOW_ORDER
) == HI_LOW_ORDER
)
830 br_insn
= HI_LOW_ORDER
| (high_bits
<< 16) | low_bits
;
832 /* FIXME: abort is probably not the right call. krk@cygnus.com */
833 abort (); /* error - not a valid branch instruction form. */
838 /* Thumb code calling an ARM function. */
841 elf32_thumb_to_arm_stub (info
, name
, input_bfd
, output_bfd
, input_section
,
842 hit_data
, sym_sec
, offset
, addend
, val
)
843 struct bfd_link_info
* info
;
847 asection
* input_section
;
851 bfd_signed_vma addend
;
856 unsigned long int tmp
;
858 struct elf_link_hash_entry
* myh
;
859 struct elf32_arm_link_hash_table
* globals
;
861 myh
= find_thumb_glue (info
, name
, input_bfd
);
865 globals
= elf32_arm_hash_table (info
);
867 BFD_ASSERT (globals
!= NULL
);
868 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
870 my_offset
= myh
->root
.u
.def
.value
;
872 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
873 THUMB2ARM_GLUE_SECTION_NAME
);
875 BFD_ASSERT (s
!= NULL
);
876 BFD_ASSERT (s
->contents
!= NULL
);
877 BFD_ASSERT (s
->output_section
!= NULL
);
879 if ((my_offset
& 0x01) == 0x01)
882 && sym_sec
->owner
!= NULL
883 && !INTERWORK_FLAG (sym_sec
->owner
))
885 (*_bfd_error_handler
)
886 (_("%s(%s): warning: interworking not enabled."),
887 bfd_archive_filename (sym_sec
->owner
), name
);
888 (*_bfd_error_handler
)
889 (_(" first occurrence: %s: thumb call to arm"),
890 bfd_archive_filename (input_bfd
));
896 myh
->root
.u
.def
.value
= my_offset
;
898 bfd_put_16 (output_bfd
, (bfd_vma
) t2a1_bx_pc_insn
,
899 s
->contents
+ my_offset
);
901 bfd_put_16 (output_bfd
, (bfd_vma
) t2a2_noop_insn
,
902 s
->contents
+ my_offset
+ 2);
905 /* Address of destination of the stub. */
906 ((bfd_signed_vma
) val
)
908 /* Offset from the start of the current section to the start of the stubs. */
910 /* Offset of the start of this stub from the start of the stubs. */
912 /* Address of the start of the current section. */
913 + s
->output_section
->vma
)
914 /* The branch instruction is 4 bytes into the stub. */
916 /* ARM branches work from the pc of the instruction + 8. */
919 bfd_put_32 (output_bfd
,
920 (bfd_vma
) t2a3_b_insn
| ((ret_offset
>> 2) & 0x00FFFFFF),
921 s
->contents
+ my_offset
+ 4);
924 BFD_ASSERT (my_offset
<= globals
->thumb_glue_size
);
926 /* Now go back and fix up the original BL insn to point
928 ret_offset
= (s
->output_offset
930 - (input_section
->output_offset
934 tmp
= bfd_get_32 (input_bfd
, hit_data
935 - input_section
->vma
);
937 bfd_put_32 (output_bfd
,
938 (bfd_vma
) insert_thumb_branch (tmp
, ret_offset
),
939 hit_data
- input_section
->vma
);
944 /* Arm code calling a Thumb function. */
947 elf32_arm_to_thumb_stub (info
, name
, input_bfd
, output_bfd
, input_section
,
948 hit_data
, sym_sec
, offset
, addend
, val
)
949 struct bfd_link_info
* info
;
953 asection
* input_section
;
957 bfd_signed_vma addend
;
960 unsigned long int tmp
;
964 struct elf_link_hash_entry
* myh
;
965 struct elf32_arm_link_hash_table
* globals
;
967 myh
= find_arm_glue (info
, name
, input_bfd
);
971 globals
= elf32_arm_hash_table (info
);
973 BFD_ASSERT (globals
!= NULL
);
974 BFD_ASSERT (globals
->bfd_of_glue_owner
!= NULL
);
976 my_offset
= myh
->root
.u
.def
.value
;
977 s
= bfd_get_section_by_name (globals
->bfd_of_glue_owner
,
978 ARM2THUMB_GLUE_SECTION_NAME
);
979 BFD_ASSERT (s
!= NULL
);
980 BFD_ASSERT (s
->contents
!= NULL
);
981 BFD_ASSERT (s
->output_section
!= NULL
);
983 if ((my_offset
& 0x01) == 0x01)
986 && sym_sec
->owner
!= NULL
987 && !INTERWORK_FLAG (sym_sec
->owner
))
989 (*_bfd_error_handler
)
990 (_("%s(%s): warning: interworking not enabled."),
991 bfd_archive_filename (sym_sec
->owner
), name
);
992 (*_bfd_error_handler
)
993 (_(" first occurrence: %s: arm call to thumb"),
994 bfd_archive_filename (input_bfd
));
998 myh
->root
.u
.def
.value
= my_offset
;
1000 bfd_put_32 (output_bfd
, (bfd_vma
) a2t1_ldr_insn
,
1001 s
->contents
+ my_offset
);
1003 bfd_put_32 (output_bfd
, (bfd_vma
) a2t2_bx_r12_insn
,
1004 s
->contents
+ my_offset
+ 4);
1006 /* It's a thumb address. Add the low order bit. */
1007 bfd_put_32 (output_bfd
, val
| a2t3_func_addr_insn
,
1008 s
->contents
+ my_offset
+ 8);
1011 BFD_ASSERT (my_offset
<= globals
->arm_glue_size
);
1013 tmp
= bfd_get_32 (input_bfd
, hit_data
);
1014 tmp
= tmp
& 0xFF000000;
1016 /* Somehow these are both 4 too far, so subtract 8. */
1017 ret_offset
= (s
->output_offset
1019 + s
->output_section
->vma
1020 - (input_section
->output_offset
1021 + input_section
->output_section
->vma
1025 tmp
= tmp
| ((ret_offset
>> 2) & 0x00FFFFFF);
1027 bfd_put_32 (output_bfd
, (bfd_vma
) tmp
, hit_data
- input_section
->vma
);
1032 /* Perform a relocation as part of a final link. */
1034 static bfd_reloc_status_type
1035 elf32_arm_final_link_relocate (howto
, input_bfd
, output_bfd
,
1036 input_section
, contents
, rel
, value
,
1037 info
, sym_sec
, sym_name
, sym_flags
, h
)
1038 reloc_howto_type
* howto
;
1041 asection
* input_section
;
1042 bfd_byte
* contents
;
1043 Elf_Internal_Rela
* rel
;
1045 struct bfd_link_info
* info
;
1047 const char * sym_name
;
1049 struct elf_link_hash_entry
* h
;
1051 unsigned long r_type
= howto
->type
;
1052 unsigned long r_symndx
;
1053 bfd_byte
* hit_data
= contents
+ rel
->r_offset
;
1054 bfd
* dynobj
= NULL
;
1055 Elf_Internal_Shdr
* symtab_hdr
;
1056 struct elf_link_hash_entry
** sym_hashes
;
1057 bfd_vma
* local_got_offsets
;
1058 asection
* sgot
= NULL
;
1059 asection
* splt
= NULL
;
1060 asection
* sreloc
= NULL
;
1062 bfd_signed_vma signed_addend
;
1063 struct elf32_arm_link_hash_table
* globals
;
1065 /* If the start address has been set, then set the EF_ARM_HASENTRY
1066 flag. Setting this more than once is redundant, but the cost is
1067 not too high, and it keeps the code simple.
1069 The test is done here, rather than somewhere else, because the
1070 start address is only set just before the final link commences.
1072 Note - if the user deliberately sets a start address of 0, the
1073 flag will not be set. */
1074 if (bfd_get_start_address (output_bfd
) != 0)
1075 elf_elfheader (output_bfd
)->e_flags
|= EF_ARM_HASENTRY
;
1077 globals
= elf32_arm_hash_table (info
);
1079 dynobj
= elf_hash_table (info
)->dynobj
;
1082 sgot
= bfd_get_section_by_name (dynobj
, ".got");
1083 splt
= bfd_get_section_by_name (dynobj
, ".plt");
1085 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1086 sym_hashes
= elf_sym_hashes (input_bfd
);
1087 local_got_offsets
= elf_local_got_offsets (input_bfd
);
1088 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1091 addend
= bfd_get_32 (input_bfd
, hit_data
) & howto
->src_mask
;
1093 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1096 signed_addend
&= ~ howto
->src_mask
;
1097 signed_addend
|= addend
;
1100 signed_addend
= addend
;
1102 addend
= signed_addend
= rel
->r_addend
;
1108 return bfd_reloc_ok
;
1116 /* When generating a shared object, these relocations are copied
1117 into the output file to be resolved at run time. */
1120 && (r_type
!= R_ARM_PC24
1123 && (! info
->symbolic
1124 || (h
->elf_link_hash_flags
1125 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
1127 Elf_Internal_Rel outrel
;
1128 boolean skip
, relocate
;
1134 name
= (bfd_elf_string_from_elf_section
1136 elf_elfheader (input_bfd
)->e_shstrndx
,
1137 elf_section_data (input_section
)->rel_hdr
.sh_name
));
1139 return bfd_reloc_notsupported
;
1141 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
1142 && strcmp (bfd_get_section_name (input_bfd
,
1146 sreloc
= bfd_get_section_by_name (dynobj
, name
);
1147 BFD_ASSERT (sreloc
!= NULL
);
1153 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
1155 if (outrel
.r_offset
== (bfd_vma
) -1)
1157 outrel
.r_offset
+= (input_section
->output_section
->vma
1158 + input_section
->output_offset
);
1162 memset (&outrel
, 0, sizeof outrel
);
1165 else if (r_type
== R_ARM_PC24
)
1167 BFD_ASSERT (h
!= NULL
&& h
->dynindx
!= -1);
1168 if ((input_section
->flags
& SEC_ALLOC
) != 0)
1172 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_PC24
);
1177 || ((info
->symbolic
|| h
->dynindx
== -1)
1178 && (h
->elf_link_hash_flags
1179 & ELF_LINK_HASH_DEF_REGULAR
) != 0))
1182 outrel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
1186 BFD_ASSERT (h
->dynindx
!= -1);
1187 if ((input_section
->flags
& SEC_ALLOC
) != 0)
1191 outrel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_ABS32
);
1195 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
,
1196 (((Elf32_External_Rel
*)
1198 + sreloc
->reloc_count
));
1199 ++sreloc
->reloc_count
;
1201 /* If this reloc is against an external symbol, we do not want to
1202 fiddle with the addend. Otherwise, we need to include the symbol
1203 value so that it becomes an addend for the dynamic reloc. */
1205 return bfd_reloc_ok
;
1207 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1208 contents
, rel
->r_offset
, value
,
1211 else switch (r_type
)
1214 case R_ARM_XPC25
: /* Arm BLX instruction. */
1216 case R_ARM_PC24
: /* Arm B/BL instruction */
1218 if (r_type
== R_ARM_XPC25
)
1220 /* Check for Arm calling Arm function. */
1221 /* FIXME: Should we translate the instruction into a BL
1222 instruction instead ? */
1223 if (sym_flags
!= STT_ARM_TFUNC
)
1224 (*_bfd_error_handler
) (_("\
1225 %s: Warning: Arm BLX instruction targets Arm function '%s'."),
1226 bfd_archive_filename (input_bfd
),
1227 h
? h
->root
.root
.string
: "(local)");
1232 /* Check for Arm calling Thumb function. */
1233 if (sym_flags
== STT_ARM_TFUNC
)
1235 elf32_arm_to_thumb_stub (info
, sym_name
, input_bfd
, output_bfd
,
1236 input_section
, hit_data
, sym_sec
, rel
->r_offset
,
1237 signed_addend
, value
);
1238 return bfd_reloc_ok
;
1242 if ( strcmp (bfd_get_target (input_bfd
), "elf32-littlearm-oabi") == 0
1243 || strcmp (bfd_get_target (input_bfd
), "elf32-bigarm-oabi") == 0)
1245 /* The old way of doing things. Trearing the addend as a
1246 byte sized field and adding in the pipeline offset. */
1247 value
-= (input_section
->output_section
->vma
1248 + input_section
->output_offset
);
1249 value
-= rel
->r_offset
;
1252 if (! globals
->no_pipeline_knowledge
)
1257 /* The ARM ELF ABI says that this reloc is computed as: S - P + A
1259 S is the address of the symbol in the relocation.
1260 P is address of the instruction being relocated.
1261 A is the addend (extracted from the instruction) in bytes.
1263 S is held in 'value'.
1264 P is the base address of the section containing the instruction
1265 plus the offset of the reloc into that section, ie:
1266 (input_section->output_section->vma +
1267 input_section->output_offset +
1269 A is the addend, converted into bytes, ie:
1272 Note: None of these operations have knowledge of the pipeline
1273 size of the processor, thus it is up to the assembler to encode
1274 this information into the addend. */
1275 value
-= (input_section
->output_section
->vma
1276 + input_section
->output_offset
);
1277 value
-= rel
->r_offset
;
1278 value
+= (signed_addend
<< howto
->size
);
1280 /* Previous versions of this code also used to add in the pipeline
1281 offset here. This is wrong because the linker is not supposed
1282 to know about such things, and one day it might change. In order
1283 to support old binaries that need the old behaviour however, so
1284 we attempt to detect which ABI was used to create the reloc. */
1285 if (! globals
->no_pipeline_knowledge
)
1287 Elf_Internal_Ehdr
* i_ehdrp
; /* Elf file header, internal form */
1289 i_ehdrp
= elf_elfheader (input_bfd
);
1291 if (i_ehdrp
->e_ident
[EI_OSABI
] == 0)
1296 signed_addend
= value
;
1297 signed_addend
>>= howto
->rightshift
;
1299 /* It is not an error for an undefined weak reference to be
1300 out of range. Any program that branches to such a symbol
1301 is going to crash anyway, so there is no point worrying
1302 about getting the destination exactly right. */
1303 if (! h
|| h
->root
.type
!= bfd_link_hash_undefweak
)
1305 /* Perform a signed range check. */
1306 if ( signed_addend
> ((bfd_signed_vma
) (howto
->dst_mask
>> 1))
1307 || signed_addend
< - ((bfd_signed_vma
) ((howto
->dst_mask
+ 1) >> 1)))
1308 return bfd_reloc_overflow
;
1312 /* If necessary set the H bit in the BLX instruction. */
1313 if (r_type
== R_ARM_XPC25
&& ((value
& 2) == 2))
1314 value
= (signed_addend
& howto
->dst_mask
)
1315 | (bfd_get_32 (input_bfd
, hit_data
) & (~ howto
->dst_mask
))
1319 value
= (signed_addend
& howto
->dst_mask
)
1320 | (bfd_get_32 (input_bfd
, hit_data
) & (~ howto
->dst_mask
));
1325 if (sym_flags
== STT_ARM_TFUNC
)
1330 value
-= (input_section
->output_section
->vma
1331 + input_section
->output_offset
+ rel
->r_offset
);
1336 bfd_put_32 (input_bfd
, value
, hit_data
);
1337 return bfd_reloc_ok
;
1341 if ((long) value
> 0x7f || (long) value
< -0x80)
1342 return bfd_reloc_overflow
;
1344 bfd_put_8 (input_bfd
, value
, hit_data
);
1345 return bfd_reloc_ok
;
1350 if ((long) value
> 0x7fff || (long) value
< -0x8000)
1351 return bfd_reloc_overflow
;
1353 bfd_put_16 (input_bfd
, value
, hit_data
);
1354 return bfd_reloc_ok
;
1357 /* Support ldr and str instruction for the arm */
1358 /* Also thumb b (unconditional branch). ??? Really? */
1361 if ((long) value
> 0x7ff || (long) value
< -0x800)
1362 return bfd_reloc_overflow
;
1364 value
|= (bfd_get_32 (input_bfd
, hit_data
) & 0xfffff000);
1365 bfd_put_32 (input_bfd
, value
, hit_data
);
1366 return bfd_reloc_ok
;
1368 case R_ARM_THM_ABS5
:
1369 /* Support ldr and str instructions for the thumb. */
1371 /* Need to refetch addend. */
1372 addend
= bfd_get_16 (input_bfd
, hit_data
) & howto
->src_mask
;
1373 /* ??? Need to determine shift amount from operand size. */
1374 addend
>>= howto
->rightshift
;
1378 /* ??? Isn't value unsigned? */
1379 if ((long) value
> 0x1f || (long) value
< -0x10)
1380 return bfd_reloc_overflow
;
1382 /* ??? Value needs to be properly shifted into place first. */
1383 value
|= bfd_get_16 (input_bfd
, hit_data
) & 0xf83f;
1384 bfd_put_16 (input_bfd
, value
, hit_data
);
1385 return bfd_reloc_ok
;
1388 case R_ARM_THM_XPC22
:
1390 case R_ARM_THM_PC22
:
1391 /* Thumb BL (branch long instruction). */
1394 boolean overflow
= false;
1395 bfd_vma upper_insn
= bfd_get_16 (input_bfd
, hit_data
);
1396 bfd_vma lower_insn
= bfd_get_16 (input_bfd
, hit_data
+ 2);
1397 bfd_signed_vma reloc_signed_max
= (1 << (howto
->bitsize
- 1)) - 1;
1398 bfd_signed_vma reloc_signed_min
= ~ reloc_signed_max
;
1400 bfd_signed_vma signed_check
;
1403 /* Need to refetch the addend and squish the two 11 bit pieces
1406 bfd_vma upper
= upper_insn
& 0x7ff;
1407 bfd_vma lower
= lower_insn
& 0x7ff;
1408 upper
= (upper
^ 0x400) - 0x400; /* Sign extend. */
1409 addend
= (upper
<< 12) | (lower
<< 1);
1410 signed_addend
= addend
;
1414 if (r_type
== R_ARM_THM_XPC22
)
1416 /* Check for Thumb to Thumb call. */
1417 /* FIXME: Should we translate the instruction into a BL
1418 instruction instead ? */
1419 if (sym_flags
== STT_ARM_TFUNC
)
1420 (*_bfd_error_handler
) (_("\
1421 %s: Warning: Thumb BLX instruction targets thumb function '%s'."),
1422 bfd_archive_filename (input_bfd
),
1423 h
? h
->root
.root
.string
: "(local)");
1428 /* If it is not a call to Thumb, assume call to Arm.
1429 If it is a call relative to a section name, then it is not a
1430 function call at all, but rather a long jump. */
1431 if (sym_flags
!= STT_ARM_TFUNC
&& sym_flags
!= STT_SECTION
)
1433 if (elf32_thumb_to_arm_stub
1434 (info
, sym_name
, input_bfd
, output_bfd
, input_section
,
1435 hit_data
, sym_sec
, rel
->r_offset
, signed_addend
, value
))
1436 return bfd_reloc_ok
;
1438 return bfd_reloc_dangerous
;
1442 relocation
= value
+ signed_addend
;
1444 relocation
-= (input_section
->output_section
->vma
1445 + input_section
->output_offset
1448 if (! globals
->no_pipeline_knowledge
)
1450 Elf_Internal_Ehdr
* i_ehdrp
; /* Elf file header, internal form. */
1452 i_ehdrp
= elf_elfheader (input_bfd
);
1454 /* Previous versions of this code also used to add in the pipline
1455 offset here. This is wrong because the linker is not supposed
1456 to know about such things, and one day it might change. In order
1457 to support old binaries that need the old behaviour however, so
1458 we attempt to detect which ABI was used to create the reloc. */
1459 if ( strcmp (bfd_get_target (input_bfd
), "elf32-littlearm-oabi") == 0
1460 || strcmp (bfd_get_target (input_bfd
), "elf32-bigarm-oabi") == 0
1461 || i_ehdrp
->e_ident
[EI_OSABI
] == 0)
1465 check
= relocation
>> howto
->rightshift
;
1467 /* If this is a signed value, the rightshift just dropped
1468 leading 1 bits (assuming twos complement). */
1469 if ((bfd_signed_vma
) relocation
>= 0)
1470 signed_check
= check
;
1472 signed_check
= check
| ~((bfd_vma
) -1 >> howto
->rightshift
);
1474 /* Assumes two's complement. */
1475 if (signed_check
> reloc_signed_max
|| signed_check
< reloc_signed_min
)
1478 /* Put RELOCATION back into the insn. */
1479 upper_insn
= (upper_insn
& ~(bfd_vma
) 0x7ff) | ((relocation
>> 12) & 0x7ff);
1480 lower_insn
= (lower_insn
& ~(bfd_vma
) 0x7ff) | ((relocation
>> 1) & 0x7ff);
1483 if (r_type
== R_ARM_THM_XPC22
1484 && ((lower_insn
& 0x1800) == 0x0800))
1485 /* Remove bit zero of the adjusted offset. Bit zero can only be
1486 set if the upper insn is at a half-word boundary, since the
1487 destination address, an ARM instruction, must always be on a
1488 word boundary. The semantics of the BLX (1) instruction, however,
1489 are that bit zero in the offset must always be zero, and the
1490 corresponding bit one in the target address will be set from bit
1491 one of the source address. */
1494 /* Put the relocated value back in the object file: */
1495 bfd_put_16 (input_bfd
, upper_insn
, hit_data
);
1496 bfd_put_16 (input_bfd
, lower_insn
, hit_data
+ 2);
1498 return (overflow
? bfd_reloc_overflow
: bfd_reloc_ok
);
1502 case R_ARM_GNU_VTINHERIT
:
1503 case R_ARM_GNU_VTENTRY
:
1504 return bfd_reloc_ok
;
1507 return bfd_reloc_notsupported
;
1509 case R_ARM_GLOB_DAT
:
1510 return bfd_reloc_notsupported
;
1512 case R_ARM_JUMP_SLOT
:
1513 return bfd_reloc_notsupported
;
1515 case R_ARM_RELATIVE
:
1516 return bfd_reloc_notsupported
;
1519 /* Relocation is relative to the start of the
1520 global offset table. */
1522 BFD_ASSERT (sgot
!= NULL
);
1524 return bfd_reloc_notsupported
;
1526 /* Note that sgot->output_offset is not involved in this
1527 calculation. We always want the start of .got. If we
1528 define _GLOBAL_OFFSET_TABLE in a different way, as is
1529 permitted by the ABI, we might have to change this
1531 value
-= sgot
->output_section
->vma
;
1532 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1533 contents
, rel
->r_offset
, value
,
1537 /* Use global offset table as symbol value. */
1538 BFD_ASSERT (sgot
!= NULL
);
1541 return bfd_reloc_notsupported
;
1543 value
= sgot
->output_section
->vma
;
1544 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1545 contents
, rel
->r_offset
, value
,
1549 /* Relocation is to the entry for this symbol in the
1550 global offset table. */
1552 return bfd_reloc_notsupported
;
1558 off
= h
->got
.offset
;
1559 BFD_ASSERT (off
!= (bfd_vma
) -1);
1561 if (!elf_hash_table (info
)->dynamic_sections_created
||
1562 (info
->shared
&& (info
->symbolic
|| h
->dynindx
== -1)
1563 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
1565 /* This is actually a static link, or it is a -Bsymbolic link
1566 and the symbol is defined locally. We must initialize this
1567 entry in the global offset table. Since the offset must
1568 always be a multiple of 4, we use the least significant bit
1569 to record whether we have initialized it already.
1571 When doing a dynamic link, we create a .rel.got relocation
1572 entry to initialize the value. This is done in the
1573 finish_dynamic_symbol routine. */
1578 bfd_put_32 (output_bfd
, value
, sgot
->contents
+ off
);
1583 value
= sgot
->output_offset
+ off
;
1589 BFD_ASSERT (local_got_offsets
!= NULL
&&
1590 local_got_offsets
[r_symndx
] != (bfd_vma
) -1);
1592 off
= local_got_offsets
[r_symndx
];
1594 /* The offset must always be a multiple of 4. We use the
1595 least significant bit to record whether we have already
1596 generated the necessary reloc. */
1601 bfd_put_32 (output_bfd
, value
, sgot
->contents
+ off
);
1606 Elf_Internal_Rel outrel
;
1608 srelgot
= bfd_get_section_by_name (dynobj
, ".rel.got");
1609 BFD_ASSERT (srelgot
!= NULL
);
1611 outrel
.r_offset
= (sgot
->output_section
->vma
1612 + sgot
->output_offset
1614 outrel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
1615 bfd_elf32_swap_reloc_out (output_bfd
, &outrel
,
1616 (((Elf32_External_Rel
*)
1618 + srelgot
->reloc_count
));
1619 ++srelgot
->reloc_count
;
1622 local_got_offsets
[r_symndx
] |= 1;
1625 value
= sgot
->output_offset
+ off
;
1628 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1629 contents
, rel
->r_offset
, value
,
1633 /* Relocation is to the entry for this symbol in the
1634 procedure linkage table. */
1636 /* Resolve a PLT32 reloc against a local symbol directly,
1637 without using the procedure linkage table. */
1639 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1640 contents
, rel
->r_offset
, value
,
1643 if (h
->plt
.offset
== (bfd_vma
) -1)
1644 /* We didn't make a PLT entry for this symbol. This
1645 happens when statically linking PIC code, or when
1646 using -Bsymbolic. */
1647 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1648 contents
, rel
->r_offset
, value
,
1651 BFD_ASSERT(splt
!= NULL
);
1653 return bfd_reloc_notsupported
;
1655 value
= (splt
->output_section
->vma
1656 + splt
->output_offset
1658 return _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
1659 contents
, rel
->r_offset
, value
,
1663 return bfd_reloc_notsupported
;
1665 case R_ARM_AMP_VCALL9
:
1666 return bfd_reloc_notsupported
;
1668 case R_ARM_RSBREL32
:
1669 return bfd_reloc_notsupported
;
1671 case R_ARM_THM_RPC22
:
1672 return bfd_reloc_notsupported
;
1675 return bfd_reloc_notsupported
;
1678 return bfd_reloc_notsupported
;
1681 return bfd_reloc_notsupported
;
1684 return bfd_reloc_notsupported
;
1687 return bfd_reloc_notsupported
;
1692 /* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */
1694 arm_add_to_rel (abfd
, address
, howto
, increment
)
1697 reloc_howto_type
* howto
;
1698 bfd_signed_vma increment
;
1700 bfd_signed_vma addend
;
1702 if (howto
->type
== R_ARM_THM_PC22
)
1704 int upper_insn
, lower_insn
;
1707 upper_insn
= bfd_get_16 (abfd
, address
);
1708 lower_insn
= bfd_get_16 (abfd
, address
+ 2);
1709 upper
= upper_insn
& 0x7ff;
1710 lower
= lower_insn
& 0x7ff;
1712 addend
= (upper
<< 12) | (lower
<< 1);
1713 addend
+= increment
;
1716 upper_insn
= (upper_insn
& 0xf800) | ((addend
>> 11) & 0x7ff);
1717 lower_insn
= (lower_insn
& 0xf800) | (addend
& 0x7ff);
1719 bfd_put_16 (abfd
, (bfd_vma
) upper_insn
, address
);
1720 bfd_put_16 (abfd
, (bfd_vma
) lower_insn
, address
+ 2);
1726 contents
= bfd_get_32 (abfd
, address
);
1728 /* Get the (signed) value from the instruction. */
1729 addend
= contents
& howto
->src_mask
;
1730 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1732 bfd_signed_vma mask
;
1735 mask
&= ~ howto
->src_mask
;
1739 /* Add in the increment, (which is a byte value). */
1740 switch (howto
->type
)
1743 addend
+= increment
;
1747 addend
<<= howto
->size
;
1748 addend
+= increment
;
1750 /* Should we check for overflow here ? */
1752 /* Drop any undesired bits. */
1753 addend
>>= howto
->rightshift
;
1757 contents
= (contents
& ~ howto
->dst_mask
) | (addend
& howto
->dst_mask
);
1759 bfd_put_32 (abfd
, contents
, address
);
1762 #endif /* USE_REL */
1764 /* Relocate an ARM ELF section. */
1766 elf32_arm_relocate_section (output_bfd
, info
, input_bfd
, input_section
,
1767 contents
, relocs
, local_syms
, local_sections
)
1769 struct bfd_link_info
* info
;
1771 asection
* input_section
;
1772 bfd_byte
* contents
;
1773 Elf_Internal_Rela
* relocs
;
1774 Elf_Internal_Sym
* local_syms
;
1775 asection
** local_sections
;
1777 Elf_Internal_Shdr
* symtab_hdr
;
1778 struct elf_link_hash_entry
** sym_hashes
;
1779 Elf_Internal_Rela
* rel
;
1780 Elf_Internal_Rela
* relend
;
1783 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
1784 sym_hashes
= elf_sym_hashes (input_bfd
);
1787 relend
= relocs
+ input_section
->reloc_count
;
1788 for (; rel
< relend
; rel
++)
1791 reloc_howto_type
* howto
;
1792 unsigned long r_symndx
;
1793 Elf_Internal_Sym
* sym
;
1795 struct elf_link_hash_entry
* h
;
1797 bfd_reloc_status_type r
;
1800 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1801 r_type
= ELF32_R_TYPE (rel
->r_info
);
1803 if ( r_type
== R_ARM_GNU_VTENTRY
1804 || r_type
== R_ARM_GNU_VTINHERIT
)
1808 elf32_arm_info_to_howto (input_bfd
, & bfd_reloc
,
1809 (Elf_Internal_Rel
*) rel
);
1811 elf32_arm_info_to_howto (input_bfd
, & bfd_reloc
, rel
);
1813 howto
= bfd_reloc
.howto
;
1815 if (info
->relocateable
)
1817 /* This is a relocateable link. We don't have to change
1818 anything, unless the reloc is against a section symbol,
1819 in which case we have to adjust according to where the
1820 section symbol winds up in the output section. */
1821 if (r_symndx
< symtab_hdr
->sh_info
)
1823 sym
= local_syms
+ r_symndx
;
1824 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
1826 sec
= local_sections
[r_symndx
];
1828 arm_add_to_rel (input_bfd
, contents
+ rel
->r_offset
,
1830 (bfd_signed_vma
) (sec
->output_offset
1833 rel
->r_addend
+= (sec
->output_offset
+ sym
->st_value
);
1841 /* This is a final link. */
1846 if (r_symndx
< symtab_hdr
->sh_info
)
1848 sym
= local_syms
+ r_symndx
;
1849 sec
= local_sections
[r_symndx
];
1851 relocation
= (sec
->output_section
->vma
1852 + sec
->output_offset
1854 if ((sec
->flags
& SEC_MERGE
)
1855 && ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
1858 bfd_vma addend
, value
;
1860 if (howto
->rightshift
)
1862 (*_bfd_error_handler
)
1863 (_("%s(%s+0x%lx): %s relocation against SEC_MERGE section"),
1864 bfd_archive_filename (input_bfd
),
1865 bfd_get_section_name (input_bfd
, input_section
),
1866 (long) rel
->r_offset
, howto
->name
);
1870 value
= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
1872 /* Get the (signed) value from the instruction. */
1873 addend
= value
& howto
->src_mask
;
1874 if (addend
& ((howto
->src_mask
+ 1) >> 1))
1876 bfd_signed_vma mask
;
1879 mask
&= ~ howto
->src_mask
;
1884 _bfd_elf_rel_local_sym (output_bfd
, sym
, &msec
, addend
)
1886 addend
+= msec
->output_section
->vma
+ msec
->output_offset
;
1887 value
= (value
& ~ howto
->dst_mask
) | (addend
& howto
->dst_mask
);
1888 bfd_put_32 (input_bfd
, value
, contents
+ rel
->r_offset
);
1891 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, sec
, rel
);
1896 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1898 while ( h
->root
.type
== bfd_link_hash_indirect
1899 || h
->root
.type
== bfd_link_hash_warning
)
1900 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1902 if ( h
->root
.type
== bfd_link_hash_defined
1903 || h
->root
.type
== bfd_link_hash_defweak
)
1905 int relocation_needed
= 1;
1907 sec
= h
->root
.u
.def
.section
;
1909 /* In these cases, we don't need the relocation value.
1910 We check specially because in some obscure cases
1911 sec->output_section will be NULL. */
1916 case R_ARM_THM_PC22
:
1919 (!info
->symbolic
&& h
->dynindx
!= -1)
1920 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
1922 && ((input_section
->flags
& SEC_ALLOC
) != 0
1923 /* DWARF will emit R_ARM_ABS32 relocations in its
1924 sections against symbols defined externally
1925 in shared libraries. We can't do anything
1927 || ((input_section
->flags
& SEC_DEBUGGING
) != 0
1928 && (h
->elf_link_hash_flags
1929 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0))
1931 relocation_needed
= 0;
1935 relocation_needed
= 0;
1939 if (elf_hash_table(info
)->dynamic_sections_created
1941 || (!info
->symbolic
&& h
->dynindx
!= -1)
1942 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
1945 relocation_needed
= 0;
1949 if (h
->plt
.offset
!= (bfd_vma
)-1)
1950 relocation_needed
= 0;
1954 if (sec
->output_section
== NULL
)
1956 (*_bfd_error_handler
)
1957 (_("%s: warning: unresolvable relocation %d against symbol `%s' from %s section"),
1958 bfd_archive_filename (input_bfd
),
1960 h
->root
.root
.string
,
1961 bfd_get_section_name (input_bfd
, input_section
));
1962 relocation_needed
= 0;
1966 if (relocation_needed
)
1967 relocation
= h
->root
.u
.def
.value
1968 + sec
->output_section
->vma
1969 + sec
->output_offset
;
1973 else if (h
->root
.type
== bfd_link_hash_undefweak
)
1975 else if (info
->shared
&& !info
->symbolic
1976 && !info
->no_undefined
1977 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
1981 if (!((*info
->callbacks
->undefined_symbol
)
1982 (info
, h
->root
.root
.string
, input_bfd
,
1983 input_section
, rel
->r_offset
,
1984 (!info
->shared
|| info
->no_undefined
1985 || ELF_ST_VISIBILITY (h
->other
)))))
1992 name
= h
->root
.root
.string
;
1995 name
= (bfd_elf_string_from_elf_section
1996 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
));
1997 if (name
== NULL
|| *name
== '\0')
1998 name
= bfd_section_name (input_bfd
, sec
);
2001 r
= elf32_arm_final_link_relocate (howto
, input_bfd
, output_bfd
,
2002 input_section
, contents
, rel
,
2003 relocation
, info
, sec
, name
,
2004 (h
? ELF_ST_TYPE (h
->type
) :
2005 ELF_ST_TYPE (sym
->st_info
)), h
);
2007 if (r
!= bfd_reloc_ok
)
2009 const char * msg
= (const char *) 0;
2013 case bfd_reloc_overflow
:
2014 /* If the overflowing reloc was to an undefined symbol,
2015 we have already printed one error message and there
2016 is no point complaining again. */
2018 h
->root
.type
!= bfd_link_hash_undefined
)
2019 && (!((*info
->callbacks
->reloc_overflow
)
2020 (info
, name
, howto
->name
, (bfd_vma
) 0,
2021 input_bfd
, input_section
, rel
->r_offset
))))
2025 case bfd_reloc_undefined
:
2026 if (!((*info
->callbacks
->undefined_symbol
)
2027 (info
, name
, input_bfd
, input_section
,
2028 rel
->r_offset
, true)))
2032 case bfd_reloc_outofrange
:
2033 msg
= _("internal error: out of range error");
2036 case bfd_reloc_notsupported
:
2037 msg
= _("internal error: unsupported relocation error");
2040 case bfd_reloc_dangerous
:
2041 msg
= _("internal error: dangerous error");
2045 msg
= _("internal error: unknown error");
2049 if (!((*info
->callbacks
->warning
)
2050 (info
, msg
, name
, input_bfd
, input_section
,
2061 /* Function to keep ARM specific flags in the ELF header. */
2063 elf32_arm_set_private_flags (abfd
, flags
)
2067 if (elf_flags_init (abfd
)
2068 && elf_elfheader (abfd
)->e_flags
!= flags
)
2070 if (EF_ARM_EABI_VERSION (flags
) == EF_ARM_EABI_UNKNOWN
)
2072 if (flags
& EF_ARM_INTERWORK
)
2073 (*_bfd_error_handler
) (_("\
2074 Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"),
2075 bfd_archive_filename (abfd
));
2077 _bfd_error_handler (_("\
2078 Warning: Clearing the interwork flag of %s due to outside request"),
2079 bfd_archive_filename (abfd
));
2084 elf_elfheader (abfd
)->e_flags
= flags
;
2085 elf_flags_init (abfd
) = true;
2091 /* Copy backend specific data from one object module to another. */
2094 elf32_arm_copy_private_bfd_data (ibfd
, obfd
)
2101 if ( bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2102 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2105 in_flags
= elf_elfheader (ibfd
)->e_flags
;
2106 out_flags
= elf_elfheader (obfd
)->e_flags
;
2108 if (elf_flags_init (obfd
)
2109 && EF_ARM_EABI_VERSION (out_flags
) == EF_ARM_EABI_UNKNOWN
2110 && in_flags
!= out_flags
)
2112 /* Cannot mix APCS26 and APCS32 code. */
2113 if ((in_flags
& EF_ARM_APCS_26
) != (out_flags
& EF_ARM_APCS_26
))
2116 /* Cannot mix float APCS and non-float APCS code. */
2117 if ((in_flags
& EF_ARM_APCS_FLOAT
) != (out_flags
& EF_ARM_APCS_FLOAT
))
2120 /* If the src and dest have different interworking flags
2121 then turn off the interworking bit. */
2122 if ((in_flags
& EF_ARM_INTERWORK
) != (out_flags
& EF_ARM_INTERWORK
))
2124 if (out_flags
& EF_ARM_INTERWORK
)
2125 _bfd_error_handler (_("\
2126 Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"),
2127 bfd_get_filename (obfd
),
2128 bfd_archive_filename (ibfd
));
2130 in_flags
&= ~EF_ARM_INTERWORK
;
2133 /* Likewise for PIC, though don't warn for this case. */
2134 if ((in_flags
& EF_ARM_PIC
) != (out_flags
& EF_ARM_PIC
))
2135 in_flags
&= ~EF_ARM_PIC
;
2138 elf_elfheader (obfd
)->e_flags
= in_flags
;
2139 elf_flags_init (obfd
) = true;
2144 /* Merge backend specific data from an object file to the output
2145 object file when linking. */
2148 elf32_arm_merge_private_bfd_data (ibfd
, obfd
)
2154 boolean flags_compatible
= true;
2155 boolean null_input_bfd
= true;
2158 /* Check if we have the same endianess. */
2159 if (_bfd_generic_verify_endian_match (ibfd
, obfd
) == false)
2162 if ( bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2163 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2166 /* The input BFD must have had its flags initialised. */
2167 /* The following seems bogus to me -- The flags are initialized in
2168 the assembler but I don't think an elf_flags_init field is
2169 written into the object. */
2170 /* BFD_ASSERT (elf_flags_init (ibfd)); */
2172 in_flags
= elf_elfheader (ibfd
)->e_flags
;
2173 out_flags
= elf_elfheader (obfd
)->e_flags
;
2175 if (!elf_flags_init (obfd
))
2177 /* If the input is the default architecture and had the default
2178 flags then do not bother setting the flags for the output
2179 architecture, instead allow future merges to do this. If no
2180 future merges ever set these flags then they will retain their
2181 uninitialised values, which surprise surprise, correspond
2182 to the default values. */
2183 if (bfd_get_arch_info (ibfd
)->the_default
2184 && elf_elfheader (ibfd
)->e_flags
== 0)
2187 elf_flags_init (obfd
) = true;
2188 elf_elfheader (obfd
)->e_flags
= in_flags
;
2190 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
2191 && bfd_get_arch_info (obfd
)->the_default
)
2192 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
), bfd_get_mach (ibfd
));
2197 /* Identical flags must be compatible. */
2198 if (in_flags
== out_flags
)
2201 /* Check to see if the input BFD actually contains any sections.
2202 If not, its flags may not have been initialised either, but it cannot
2203 actually cause any incompatibility. */
2204 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2206 /* Ignore synthetic glue sections. */
2207 if (strcmp (sec
->name
, ".glue_7")
2208 && strcmp (sec
->name
, ".glue_7t"))
2210 null_input_bfd
= false;
2217 /* Complain about various flag mismatches. */
2218 if (EF_ARM_EABI_VERSION (in_flags
) != EF_ARM_EABI_VERSION (out_flags
))
2220 _bfd_error_handler (_("\
2221 Error: %s compiled for EABI version %d, whereas %s is compiled for version %d"),
2222 bfd_archive_filename (ibfd
),
2223 (in_flags
& EF_ARM_EABIMASK
) >> 24,
2224 bfd_get_filename (obfd
),
2225 (out_flags
& EF_ARM_EABIMASK
) >> 24);
2229 /* Not sure what needs to be checked for EABI versions >= 1. */
2230 if (EF_ARM_EABI_VERSION (in_flags
) == EF_ARM_EABI_UNKNOWN
)
2232 if ((in_flags
& EF_ARM_APCS_26
) != (out_flags
& EF_ARM_APCS_26
))
2234 _bfd_error_handler (_("\
2235 Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"),
2236 bfd_archive_filename (ibfd
),
2237 in_flags
& EF_ARM_APCS_26
? 26 : 32,
2238 bfd_get_filename (obfd
),
2239 out_flags
& EF_ARM_APCS_26
? 26 : 32);
2240 flags_compatible
= false;
2243 if ((in_flags
& EF_ARM_APCS_FLOAT
) != (out_flags
& EF_ARM_APCS_FLOAT
))
2245 char *s1
= in_flags
& EF_ARM_APCS_FLOAT
? _("float") : _("integer");
2246 char *s2
= out_flags
& EF_ARM_APCS_FLOAT
? _("float") : _("integer");
2248 _bfd_error_handler (_("\
2249 Error: %s passes floats in %s registers, whereas %s passes them in %s registers"),
2250 bfd_archive_filename (ibfd
), s1
,
2251 bfd_get_filename (obfd
), s2
);
2252 flags_compatible
= false;
2255 #ifdef EF_ARM_SOFT_FLOAT
2256 if ((in_flags
& EF_ARM_SOFT_FLOAT
) != (out_flags
& EF_ARM_SOFT_FLOAT
))
2258 char *s1
= in_flags
& EF_ARM_SOFT_FLOAT
? _("soft") : _("hard");
2259 char *s2
= out_flags
& EF_ARM_SOFT_FLOAT
? _("soft") : _("hard");
2261 _bfd_error_handler (_ ("\
2262 Error: %s uses %s floating point, whereas %s uses %s floating point"),
2263 bfd_archive_filename (ibfd
), s1
,
2264 bfd_get_filename (obfd
), s2
);
2265 flags_compatible
= false;
2269 /* Interworking mismatch is only a warning. */
2270 if ((in_flags
& EF_ARM_INTERWORK
) != (out_flags
& EF_ARM_INTERWORK
))
2272 if (in_flags
& EF_ARM_INTERWORK
)
2274 _bfd_error_handler (_("\
2275 Warning: %s supports interworking, whereas %s does not"),
2276 bfd_archive_filename (ibfd
),
2277 bfd_get_filename (obfd
));
2281 _bfd_error_handler (_("\
2282 Warning: %s does not support interworking, whereas %s does"),
2283 bfd_archive_filename (ibfd
),
2284 bfd_get_filename (obfd
));
2289 return flags_compatible
;
2292 /* Display the flags field. */
2295 elf32_arm_print_private_bfd_data (abfd
, ptr
)
2299 FILE * file
= (FILE *) ptr
;
2300 unsigned long flags
;
2302 BFD_ASSERT (abfd
!= NULL
&& ptr
!= NULL
);
2304 /* Print normal ELF private data. */
2305 _bfd_elf_print_private_bfd_data (abfd
, ptr
);
2307 flags
= elf_elfheader (abfd
)->e_flags
;
2308 /* Ignore init flag - it may not be set, despite the flags field
2309 containing valid data. */
2311 /* xgettext:c-format */
2312 fprintf (file
, _("private flags = %lx:"), elf_elfheader (abfd
)->e_flags
);
2314 switch (EF_ARM_EABI_VERSION (flags
))
2316 case EF_ARM_EABI_UNKNOWN
:
2317 /* The following flag bits are GNU extenstions and not part of the
2318 official ARM ELF extended ABI. Hence they are only decoded if
2319 the EABI version is not set. */
2320 if (flags
& EF_ARM_INTERWORK
)
2321 fprintf (file
, _(" [interworking enabled]"));
2323 if (flags
& EF_ARM_APCS_26
)
2324 fprintf (file
, _(" [APCS-26]"));
2326 fprintf (file
, _(" [APCS-32]"));
2328 if (flags
& EF_ARM_APCS_FLOAT
)
2329 fprintf (file
, _(" [floats passed in float registers]"));
2331 if (flags
& EF_ARM_PIC
)
2332 fprintf (file
, _(" [position independent]"));
2334 if (flags
& EF_ARM_NEW_ABI
)
2335 fprintf (file
, _(" [new ABI]"));
2337 if (flags
& EF_ARM_OLD_ABI
)
2338 fprintf (file
, _(" [old ABI]"));
2340 if (flags
& EF_ARM_SOFT_FLOAT
)
2341 fprintf (file
, _(" [software FP]"));
2343 flags
&= ~(EF_ARM_INTERWORK
| EF_ARM_APCS_26
| EF_ARM_APCS_FLOAT
| EF_ARM_PIC
2344 | EF_ARM_NEW_ABI
| EF_ARM_OLD_ABI
| EF_ARM_SOFT_FLOAT
);
2347 case EF_ARM_EABI_VER1
:
2348 fprintf (file
, _(" [Version1 EABI]"));
2350 if (flags
& EF_ARM_SYMSARESORTED
)
2351 fprintf (file
, _(" [sorted symbol table]"));
2353 fprintf (file
, _(" [unsorted symbol table]"));
2355 flags
&= ~ EF_ARM_SYMSARESORTED
;
2358 case EF_ARM_EABI_VER2
:
2359 fprintf (file
, _(" [Version2 EABI]"));
2361 if (flags
& EF_ARM_SYMSARESORTED
)
2362 fprintf (file
, _(" [sorted symbol table]"));
2364 fprintf (file
, _(" [unsorted symbol table]"));
2366 if (flags
& EF_ARM_DYNSYMSUSESEGIDX
)
2367 fprintf (file
, _(" [dynamic symbols use segment index]"));
2369 if (flags
& EF_ARM_MAPSYMSFIRST
)
2370 fprintf (file
, _(" [mapping symbols precede others]"));
2372 flags
&= ~(EF_ARM_SYMSARESORTED
| EF_ARM_DYNSYMSUSESEGIDX
2373 | EF_ARM_MAPSYMSFIRST
);
2377 fprintf (file
, _(" <EABI version unrecognised>"));
2381 flags
&= ~ EF_ARM_EABIMASK
;
2383 if (flags
& EF_ARM_RELEXEC
)
2384 fprintf (file
, _(" [relocatable executable]"));
2386 if (flags
& EF_ARM_HASENTRY
)
2387 fprintf (file
, _(" [has entry point]"));
2389 flags
&= ~ (EF_ARM_RELEXEC
| EF_ARM_HASENTRY
);
2392 fprintf (file
, _("<Unrecognised flag bits set>"));
2400 elf32_arm_get_symbol_type (elf_sym
, type
)
2401 Elf_Internal_Sym
* elf_sym
;
2404 switch (ELF_ST_TYPE (elf_sym
->st_info
))
2407 return ELF_ST_TYPE (elf_sym
->st_info
);
2410 /* If the symbol is not an object, return the STT_ARM_16BIT flag.
2411 This allows us to distinguish between data used by Thumb instructions
2412 and non-data (which is probably code) inside Thumb regions of an
2414 if (type
!= STT_OBJECT
)
2415 return ELF_ST_TYPE (elf_sym
->st_info
);
2426 elf32_arm_gc_mark_hook (abfd
, info
, rel
, h
, sym
)
2428 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
2429 Elf_Internal_Rela
*rel
;
2430 struct elf_link_hash_entry
*h
;
2431 Elf_Internal_Sym
*sym
;
2435 switch (ELF32_R_TYPE (rel
->r_info
))
2437 case R_ARM_GNU_VTINHERIT
:
2438 case R_ARM_GNU_VTENTRY
:
2442 switch (h
->root
.type
)
2444 case bfd_link_hash_defined
:
2445 case bfd_link_hash_defweak
:
2446 return h
->root
.u
.def
.section
;
2448 case bfd_link_hash_common
:
2449 return h
->root
.u
.c
.p
->section
;
2458 return bfd_section_from_elf_index (abfd
, sym
->st_shndx
);
2464 /* Update the got entry reference counts for the section being removed. */
2467 elf32_arm_gc_sweep_hook (abfd
, info
, sec
, relocs
)
2468 bfd
*abfd ATTRIBUTE_UNUSED
;
2469 struct bfd_link_info
*info ATTRIBUTE_UNUSED
;
2470 asection
*sec ATTRIBUTE_UNUSED
;
2471 const Elf_Internal_Rela
*relocs ATTRIBUTE_UNUSED
;
2473 /* We don't support garbage collection of GOT and PLT relocs yet. */
2477 /* Look through the relocs for a section during the first phase. */
2480 elf32_arm_check_relocs (abfd
, info
, sec
, relocs
)
2482 struct bfd_link_info
* info
;
2484 const Elf_Internal_Rela
* relocs
;
2486 Elf_Internal_Shdr
* symtab_hdr
;
2487 struct elf_link_hash_entry
** sym_hashes
;
2488 struct elf_link_hash_entry
** sym_hashes_end
;
2489 const Elf_Internal_Rela
* rel
;
2490 const Elf_Internal_Rela
* rel_end
;
2492 asection
* sgot
, *srelgot
, *sreloc
;
2493 bfd_vma
* local_got_offsets
;
2495 if (info
->relocateable
)
2498 sgot
= srelgot
= sreloc
= NULL
;
2500 dynobj
= elf_hash_table (info
)->dynobj
;
2501 local_got_offsets
= elf_local_got_offsets (abfd
);
2503 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2504 sym_hashes
= elf_sym_hashes (abfd
);
2505 sym_hashes_end
= sym_hashes
2506 + symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
2508 if (!elf_bad_symtab (abfd
))
2509 sym_hashes_end
-= symtab_hdr
->sh_info
;
2511 rel_end
= relocs
+ sec
->reloc_count
;
2512 for (rel
= relocs
; rel
< rel_end
; rel
++)
2514 struct elf_link_hash_entry
*h
;
2515 unsigned long r_symndx
;
2517 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2518 if (r_symndx
< symtab_hdr
->sh_info
)
2521 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
2523 /* Some relocs require a global offset table. */
2526 switch (ELF32_R_TYPE (rel
->r_info
))
2531 elf_hash_table (info
)->dynobj
= dynobj
= abfd
;
2532 if (! _bfd_elf_create_got_section (dynobj
, info
))
2541 switch (ELF32_R_TYPE (rel
->r_info
))
2544 /* This symbol requires a global offset table entry. */
2547 sgot
= bfd_get_section_by_name (dynobj
, ".got");
2548 BFD_ASSERT (sgot
!= NULL
);
2551 /* Get the got relocation section if necessary. */
2553 && (h
!= NULL
|| info
->shared
))
2555 srelgot
= bfd_get_section_by_name (dynobj
, ".rel.got");
2557 /* If no got relocation section, make one and initialize. */
2558 if (srelgot
== NULL
)
2560 srelgot
= bfd_make_section (dynobj
, ".rel.got");
2562 || ! bfd_set_section_flags (dynobj
, srelgot
,
2567 | SEC_LINKER_CREATED
2569 || ! bfd_set_section_alignment (dynobj
, srelgot
, 2))
2576 if (h
->got
.offset
!= (bfd_vma
) -1)
2577 /* We have already allocated space in the .got. */
2580 h
->got
.offset
= sgot
->_raw_size
;
2582 /* Make sure this symbol is output as a dynamic symbol. */
2583 if (h
->dynindx
== -1)
2584 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
2587 srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
2591 /* This is a global offset table entry for a local
2593 if (local_got_offsets
== NULL
)
2598 size
= symtab_hdr
->sh_info
;
2599 size
*= sizeof (bfd_vma
);
2600 local_got_offsets
= (bfd_vma
*) bfd_alloc (abfd
, size
);
2601 if (local_got_offsets
== NULL
)
2603 elf_local_got_offsets (abfd
) = local_got_offsets
;
2604 for (i
= 0; i
< symtab_hdr
->sh_info
; i
++)
2605 local_got_offsets
[i
] = (bfd_vma
) -1;
2608 if (local_got_offsets
[r_symndx
] != (bfd_vma
) -1)
2609 /* We have already allocated space in the .got. */
2612 local_got_offsets
[r_symndx
] = sgot
->_raw_size
;
2615 /* If we are generating a shared object, we need to
2616 output a R_ARM_RELATIVE reloc so that the dynamic
2617 linker can adjust this GOT entry. */
2618 srelgot
->_raw_size
+= sizeof (Elf32_External_Rel
);
2621 sgot
->_raw_size
+= 4;
2625 /* This symbol requires a procedure linkage table entry. We
2626 actually build the entry in adjust_dynamic_symbol,
2627 because this might be a case of linking PIC code which is
2628 never referenced by a dynamic object, in which case we
2629 don't need to generate a procedure linkage table entry
2632 /* If this is a local symbol, we resolve it directly without
2633 creating a procedure linkage table entry. */
2637 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_PLT
;
2643 /* If we are creating a shared library, and this is a reloc
2644 against a global symbol, or a non PC relative reloc
2645 against a local symbol, then we need to copy the reloc
2646 into the shared library. However, if we are linking with
2647 -Bsymbolic, we do not need to copy a reloc against a
2648 global symbol which is defined in an object we are
2649 including in the link (i.e., DEF_REGULAR is set). At
2650 this point we have not seen all the input files, so it is
2651 possible that DEF_REGULAR is not set now but will be set
2652 later (it is never cleared). We account for that
2653 possibility below by storing information in the
2654 pcrel_relocs_copied field of the hash table entry. */
2656 && (ELF32_R_TYPE (rel
->r_info
) != R_ARM_PC24
2658 && (! info
->symbolic
2659 || (h
->elf_link_hash_flags
2660 & ELF_LINK_HASH_DEF_REGULAR
) == 0))))
2662 /* When creating a shared object, we must copy these
2663 reloc types into the output file. We create a reloc
2664 section in dynobj and make room for this reloc. */
2669 name
= (bfd_elf_string_from_elf_section
2671 elf_elfheader (abfd
)->e_shstrndx
,
2672 elf_section_data (sec
)->rel_hdr
.sh_name
));
2676 BFD_ASSERT (strncmp (name
, ".rel", 4) == 0
2677 && strcmp (bfd_get_section_name (abfd
, sec
),
2680 sreloc
= bfd_get_section_by_name (dynobj
, name
);
2685 sreloc
= bfd_make_section (dynobj
, name
);
2686 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
2687 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
2688 if ((sec
->flags
& SEC_ALLOC
) != 0)
2689 flags
|= SEC_ALLOC
| SEC_LOAD
;
2691 || ! bfd_set_section_flags (dynobj
, sreloc
, flags
)
2692 || ! bfd_set_section_alignment (dynobj
, sreloc
, 2))
2695 if (sec
->flags
& SEC_READONLY
)
2696 info
->flags
|= DF_TEXTREL
;
2699 sreloc
->_raw_size
+= sizeof (Elf32_External_Rel
);
2700 /* If we are linking with -Bsymbolic, and this is a
2701 global symbol, we count the number of PC relative
2702 relocations we have entered for this symbol, so that
2703 we can discard them again if the symbol is later
2704 defined by a regular object. Note that this function
2705 is only called if we are using an elf_i386 linker
2706 hash table, which means that h is really a pointer to
2707 an elf_i386_link_hash_entry. */
2708 if (h
!= NULL
&& info
->symbolic
2709 && ELF32_R_TYPE (rel
->r_info
) == R_ARM_PC24
)
2711 struct elf32_arm_link_hash_entry
* eh
;
2712 struct elf32_arm_pcrel_relocs_copied
* p
;
2714 eh
= (struct elf32_arm_link_hash_entry
*) h
;
2716 for (p
= eh
->pcrel_relocs_copied
; p
!= NULL
; p
= p
->next
)
2717 if (p
->section
== sreloc
)
2722 p
= ((struct elf32_arm_pcrel_relocs_copied
*)
2723 bfd_alloc (dynobj
, (bfd_size_type
) sizeof * p
));
2726 p
->next
= eh
->pcrel_relocs_copied
;
2727 eh
->pcrel_relocs_copied
= p
;
2728 p
->section
= sreloc
;
2737 /* This relocation describes the C++ object vtable hierarchy.
2738 Reconstruct it for later use during GC. */
2739 case R_ARM_GNU_VTINHERIT
:
2740 if (!_bfd_elf32_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2744 /* This relocation describes which C++ vtable entries are actually
2745 used. Record for later use during GC. */
2746 case R_ARM_GNU_VTENTRY
:
2747 if (!_bfd_elf32_gc_record_vtentry (abfd
, sec
, h
, rel
->r_offset
))
2756 /* Find the nearest line to a particular section and offset, for error
2757 reporting. This code is a duplicate of the code in elf.c, except
2758 that it also accepts STT_ARM_TFUNC as a symbol that names a function. */
2761 elf32_arm_find_nearest_line
2762 (abfd
, section
, symbols
, offset
, filename_ptr
, functionname_ptr
, line_ptr
)
2767 const char ** filename_ptr
;
2768 const char ** functionname_ptr
;
2769 unsigned int * line_ptr
;
2772 const char * filename
;
2777 if (_bfd_dwarf2_find_nearest_line (abfd
, section
, symbols
, offset
,
2778 filename_ptr
, functionname_ptr
,
2780 &elf_tdata (abfd
)->dwarf2_find_line_info
))
2783 if (! _bfd_stab_section_find_nearest_line (abfd
, symbols
, section
, offset
,
2784 &found
, filename_ptr
,
2785 functionname_ptr
, line_ptr
,
2786 &elf_tdata (abfd
)->line_info
))
2792 if (symbols
== NULL
)
2799 for (p
= symbols
; *p
!= NULL
; p
++)
2803 q
= (elf_symbol_type
*) *p
;
2805 if (bfd_get_section (&q
->symbol
) != section
)
2808 switch (ELF_ST_TYPE (q
->internal_elf_sym
.st_info
))
2813 filename
= bfd_asymbol_name (&q
->symbol
);
2818 if (q
->symbol
.section
== section
2819 && q
->symbol
.value
>= low_func
2820 && q
->symbol
.value
<= offset
)
2822 func
= (asymbol
*) q
;
2823 low_func
= q
->symbol
.value
;
2832 *filename_ptr
= filename
;
2833 *functionname_ptr
= bfd_asymbol_name (func
);
2839 /* Adjust a symbol defined by a dynamic object and referenced by a
2840 regular object. The current definition is in some section of the
2841 dynamic object, but we're not including those sections. We have to
2842 change the definition to something the rest of the link can
2846 elf32_arm_adjust_dynamic_symbol (info
, h
)
2847 struct bfd_link_info
* info
;
2848 struct elf_link_hash_entry
* h
;
2852 unsigned int power_of_two
;
2854 dynobj
= elf_hash_table (info
)->dynobj
;
2856 /* Make sure we know what is going on here. */
2857 BFD_ASSERT (dynobj
!= NULL
2858 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
)
2859 || h
->weakdef
!= NULL
2860 || ((h
->elf_link_hash_flags
2861 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2862 && (h
->elf_link_hash_flags
2863 & ELF_LINK_HASH_REF_REGULAR
) != 0
2864 && (h
->elf_link_hash_flags
2865 & ELF_LINK_HASH_DEF_REGULAR
) == 0)));
2867 /* If this is a function, put it in the procedure linkage table. We
2868 will fill in the contents of the procedure linkage table later,
2869 when we know the address of the .got section. */
2870 if (h
->type
== STT_FUNC
2871 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0)
2874 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2875 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) == 0)
2877 /* This case can occur if we saw a PLT32 reloc in an input
2878 file, but the symbol was never referred to by a dynamic
2879 object. In such a case, we don't actually need to build
2880 a procedure linkage table, and we can just do a PC32
2882 BFD_ASSERT ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0);
2886 /* Make sure this symbol is output as a dynamic symbol. */
2887 if (h
->dynindx
== -1)
2889 if (! bfd_elf32_link_record_dynamic_symbol (info
, h
))
2893 s
= bfd_get_section_by_name (dynobj
, ".plt");
2894 BFD_ASSERT (s
!= NULL
);
2896 /* If this is the first .plt entry, make room for the special
2898 if (s
->_raw_size
== 0)
2899 s
->_raw_size
+= PLT_ENTRY_SIZE
;
2901 /* If this symbol is not defined in a regular file, and we are
2902 not generating a shared library, then set the symbol to this
2903 location in the .plt. This is required to make function
2904 pointers compare as equal between the normal executable and
2905 the shared library. */
2907 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2909 h
->root
.u
.def
.section
= s
;
2910 h
->root
.u
.def
.value
= s
->_raw_size
;
2913 h
->plt
.offset
= s
->_raw_size
;
2915 /* Make room for this entry. */
2916 s
->_raw_size
+= PLT_ENTRY_SIZE
;
2918 /* We also need to make an entry in the .got.plt section, which
2919 will be placed in the .got section by the linker script. */
2920 s
= bfd_get_section_by_name (dynobj
, ".got.plt");
2921 BFD_ASSERT (s
!= NULL
);
2924 /* We also need to make an entry in the .rel.plt section. */
2926 s
= bfd_get_section_by_name (dynobj
, ".rel.plt");
2927 BFD_ASSERT (s
!= NULL
);
2928 s
->_raw_size
+= sizeof (Elf32_External_Rel
);
2933 /* If this is a weak symbol, and there is a real definition, the
2934 processor independent code will have arranged for us to see the
2935 real definition first, and we can just use the same value. */
2936 if (h
->weakdef
!= NULL
)
2938 BFD_ASSERT (h
->weakdef
->root
.type
== bfd_link_hash_defined
2939 || h
->weakdef
->root
.type
== bfd_link_hash_defweak
);
2940 h
->root
.u
.def
.section
= h
->weakdef
->root
.u
.def
.section
;
2941 h
->root
.u
.def
.value
= h
->weakdef
->root
.u
.def
.value
;
2945 /* This is a reference to a symbol defined by a dynamic object which
2946 is not a function. */
2948 /* If we are creating a shared library, we must presume that the
2949 only references to the symbol are via the global offset table.
2950 For such cases we need not do anything here; the relocations will
2951 be handled correctly by relocate_section. */
2955 /* We must allocate the symbol in our .dynbss section, which will
2956 become part of the .bss section of the executable. There will be
2957 an entry for this symbol in the .dynsym section. The dynamic
2958 object will contain position independent code, so all references
2959 from the dynamic object to this symbol will go through the global
2960 offset table. The dynamic linker will use the .dynsym entry to
2961 determine the address it must put in the global offset table, so
2962 both the dynamic object and the regular object will refer to the
2963 same memory location for the variable. */
2964 s
= bfd_get_section_by_name (dynobj
, ".dynbss");
2965 BFD_ASSERT (s
!= NULL
);
2967 /* We must generate a R_ARM_COPY reloc to tell the dynamic linker to
2968 copy the initial value out of the dynamic object and into the
2969 runtime process image. We need to remember the offset into the
2970 .rel.bss section we are going to use. */
2971 if ((h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0)
2975 srel
= bfd_get_section_by_name (dynobj
, ".rel.bss");
2976 BFD_ASSERT (srel
!= NULL
);
2977 srel
->_raw_size
+= sizeof (Elf32_External_Rel
);
2978 h
->elf_link_hash_flags
|= ELF_LINK_HASH_NEEDS_COPY
;
2981 /* We need to figure out the alignment required for this symbol. I
2982 have no idea how ELF linkers handle this. */
2983 power_of_two
= bfd_log2 (h
->size
);
2984 if (power_of_two
> 3)
2987 /* Apply the required alignment. */
2988 s
->_raw_size
= BFD_ALIGN (s
->_raw_size
,
2989 (bfd_size_type
) (1 << power_of_two
));
2990 if (power_of_two
> bfd_get_section_alignment (dynobj
, s
))
2992 if (! bfd_set_section_alignment (dynobj
, s
, power_of_two
))
2996 /* Define the symbol as being at this point in the section. */
2997 h
->root
.u
.def
.section
= s
;
2998 h
->root
.u
.def
.value
= s
->_raw_size
;
3000 /* Increment the section size to make room for the symbol. */
3001 s
->_raw_size
+= h
->size
;
3006 /* Set the sizes of the dynamic sections. */
3009 elf32_arm_size_dynamic_sections (output_bfd
, info
)
3010 bfd
* output_bfd ATTRIBUTE_UNUSED
;
3011 struct bfd_link_info
* info
;
3018 dynobj
= elf_hash_table (info
)->dynobj
;
3019 BFD_ASSERT (dynobj
!= NULL
);
3021 if (elf_hash_table (info
)->dynamic_sections_created
)
3023 /* Set the contents of the .interp section to the interpreter. */
3026 s
= bfd_get_section_by_name (dynobj
, ".interp");
3027 BFD_ASSERT (s
!= NULL
);
3028 s
->_raw_size
= sizeof ELF_DYNAMIC_INTERPRETER
;
3029 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
3034 /* We may have created entries in the .rel.got section.
3035 However, if we are not creating the dynamic sections, we will
3036 not actually use these entries. Reset the size of .rel.got,
3037 which will cause it to get stripped from the output file
3039 s
= bfd_get_section_by_name (dynobj
, ".rel.got");
3044 /* If this is a -Bsymbolic shared link, then we need to discard all
3045 PC relative relocs against symbols defined in a regular object.
3046 We allocated space for them in the check_relocs routine, but we
3047 will not fill them in in the relocate_section routine. */
3048 if (info
->shared
&& info
->symbolic
)
3049 elf32_arm_link_hash_traverse (elf32_arm_hash_table (info
),
3050 elf32_arm_discard_copies
,
3053 /* The check_relocs and adjust_dynamic_symbol entry points have
3054 determined the sizes of the various dynamic sections. Allocate
3058 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
3063 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
3066 /* It's OK to base decisions on the section name, because none
3067 of the dynobj section names depend upon the input files. */
3068 name
= bfd_get_section_name (dynobj
, s
);
3072 if (strcmp (name
, ".plt") == 0)
3074 if (s
->_raw_size
== 0)
3076 /* Strip this section if we don't need it; see the
3082 /* Remember whether there is a PLT. */
3086 else if (strncmp (name
, ".rel", 4) == 0)
3088 if (s
->_raw_size
== 0)
3090 /* If we don't need this section, strip it from the
3091 output file. This is mostly to handle .rel.bss and
3092 .rel.plt. We must create both sections in
3093 create_dynamic_sections, because they must be created
3094 before the linker maps input sections to output
3095 sections. The linker does that before
3096 adjust_dynamic_symbol is called, and it is that
3097 function which decides whether anything needs to go
3098 into these sections. */
3103 /* Remember whether there are any reloc sections other
3105 if (strcmp (name
, ".rel.plt") != 0)
3108 /* We use the reloc_count field as a counter if we need
3109 to copy relocs into the output file. */
3113 else if (strncmp (name
, ".got", 4) != 0)
3115 /* It's not one of our sections, so don't allocate space. */
3123 for (spp
= &s
->output_section
->owner
->sections
;
3124 *spp
!= s
->output_section
;
3125 spp
= &(*spp
)->next
)
3127 *spp
= s
->output_section
->next
;
3128 --s
->output_section
->owner
->section_count
;
3133 /* Allocate memory for the section contents. */
3134 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->_raw_size
);
3135 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3139 if (elf_hash_table (info
)->dynamic_sections_created
)
3141 /* Add some entries to the .dynamic section. We fill in the
3142 values later, in elf32_arm_finish_dynamic_sections, but we
3143 must add the entries now so that we get the correct size for
3144 the .dynamic section. The DT_DEBUG entry is filled in by the
3145 dynamic linker and used by the debugger. */
3146 #define add_dynamic_entry(TAG, VAL) \
3147 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
3151 if (!add_dynamic_entry (DT_DEBUG
, 0))
3157 if ( !add_dynamic_entry (DT_PLTGOT
, 0)
3158 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
3159 || !add_dynamic_entry (DT_PLTREL
, DT_REL
)
3160 || !add_dynamic_entry (DT_JMPREL
, 0))
3166 if ( !add_dynamic_entry (DT_REL
, 0)
3167 || !add_dynamic_entry (DT_RELSZ
, 0)
3168 || !add_dynamic_entry (DT_RELENT
, sizeof (Elf32_External_Rel
)))
3172 if ((info
->flags
& DF_TEXTREL
) != 0)
3174 if (!add_dynamic_entry (DT_TEXTREL
, 0))
3176 info
->flags
|= DF_TEXTREL
;
3179 #undef add_synamic_entry
3184 /* This function is called via elf32_arm_link_hash_traverse if we are
3185 creating a shared object with -Bsymbolic. It discards the space
3186 allocated to copy PC relative relocs against symbols which are
3187 defined in regular objects. We allocated space for them in the
3188 check_relocs routine, but we won't fill them in in the
3189 relocate_section routine. */
3192 elf32_arm_discard_copies (h
, ignore
)
3193 struct elf32_arm_link_hash_entry
* h
;
3194 PTR ignore ATTRIBUTE_UNUSED
;
3196 struct elf32_arm_pcrel_relocs_copied
* s
;
3198 /* We only discard relocs for symbols defined in a regular object. */
3199 if ((h
->root
.elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3202 for (s
= h
->pcrel_relocs_copied
; s
!= NULL
; s
= s
->next
)
3203 s
->section
->_raw_size
-= s
->count
* sizeof (Elf32_External_Rel
);
3208 /* Finish up dynamic symbol handling. We set the contents of various
3209 dynamic sections here. */
3212 elf32_arm_finish_dynamic_symbol (output_bfd
, info
, h
, sym
)
3214 struct bfd_link_info
* info
;
3215 struct elf_link_hash_entry
* h
;
3216 Elf_Internal_Sym
* sym
;
3220 dynobj
= elf_hash_table (info
)->dynobj
;
3222 if (h
->plt
.offset
!= (bfd_vma
) -1)
3229 Elf_Internal_Rel rel
;
3231 /* This symbol has an entry in the procedure linkage table. Set
3234 BFD_ASSERT (h
->dynindx
!= -1);
3236 splt
= bfd_get_section_by_name (dynobj
, ".plt");
3237 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
3238 srel
= bfd_get_section_by_name (dynobj
, ".rel.plt");
3239 BFD_ASSERT (splt
!= NULL
&& sgot
!= NULL
&& srel
!= NULL
);
3241 /* Get the index in the procedure linkage table which
3242 corresponds to this symbol. This is the index of this symbol
3243 in all the symbols for which we are making plt entries. The
3244 first entry in the procedure linkage table is reserved. */
3245 plt_index
= h
->plt
.offset
/ PLT_ENTRY_SIZE
- 1;
3247 /* Get the offset into the .got table of the entry that
3248 corresponds to this function. Each .got entry is 4 bytes.
3249 The first three are reserved. */
3250 got_offset
= (plt_index
+ 3) * 4;
3252 /* Fill in the entry in the procedure linkage table. */
3253 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[0],
3254 splt
->contents
+ h
->plt
.offset
+ 0);
3255 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[1],
3256 splt
->contents
+ h
->plt
.offset
+ 4);
3257 bfd_put_32 (output_bfd
, elf32_arm_plt_entry
[2],
3258 splt
->contents
+ h
->plt
.offset
+ 8);
3259 bfd_put_32 (output_bfd
,
3260 (sgot
->output_section
->vma
3261 + sgot
->output_offset
3263 - splt
->output_section
->vma
3264 - splt
->output_offset
3265 - h
->plt
.offset
- 12),
3266 splt
->contents
+ h
->plt
.offset
+ 12);
3268 /* Fill in the entry in the global offset table. */
3269 bfd_put_32 (output_bfd
,
3270 (splt
->output_section
->vma
3271 + splt
->output_offset
),
3272 sgot
->contents
+ got_offset
);
3274 /* Fill in the entry in the .rel.plt section. */
3275 rel
.r_offset
= (sgot
->output_section
->vma
3276 + sgot
->output_offset
3278 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_JUMP_SLOT
);
3279 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
3280 ((Elf32_External_Rel
*) srel
->contents
3283 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3285 /* Mark the symbol as undefined, rather than as defined in
3286 the .plt section. Leave the value alone. */
3287 sym
->st_shndx
= SHN_UNDEF
;
3288 /* If the symbol is weak, we do need to clear the value.
3289 Otherwise, the PLT entry would provide a definition for
3290 the symbol even if the symbol wasn't defined anywhere,
3291 and so the symbol would never be NULL. */
3292 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
)
3298 if (h
->got
.offset
!= (bfd_vma
) -1)
3302 Elf_Internal_Rel rel
;
3304 /* This symbol has an entry in the global offset table. Set it
3306 sgot
= bfd_get_section_by_name (dynobj
, ".got");
3307 srel
= bfd_get_section_by_name (dynobj
, ".rel.got");
3308 BFD_ASSERT (sgot
!= NULL
&& srel
!= NULL
);
3310 rel
.r_offset
= (sgot
->output_section
->vma
3311 + sgot
->output_offset
3312 + (h
->got
.offset
&~ (bfd_vma
) 1));
3314 /* If this is a -Bsymbolic link, and the symbol is defined
3315 locally, we just want to emit a RELATIVE reloc. The entry in
3316 the global offset table will already have been initialized in
3317 the relocate_section function. */
3319 && (info
->symbolic
|| h
->dynindx
== -1)
3320 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
))
3321 rel
.r_info
= ELF32_R_INFO (0, R_ARM_RELATIVE
);
3324 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ h
->got
.offset
);
3325 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_GLOB_DAT
);
3328 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
3329 ((Elf32_External_Rel
*) srel
->contents
3330 + srel
->reloc_count
));
3331 ++srel
->reloc_count
;
3334 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_COPY
) != 0)
3337 Elf_Internal_Rel rel
;
3339 /* This symbol needs a copy reloc. Set it up. */
3340 BFD_ASSERT (h
->dynindx
!= -1
3341 && (h
->root
.type
== bfd_link_hash_defined
3342 || h
->root
.type
== bfd_link_hash_defweak
));
3344 s
= bfd_get_section_by_name (h
->root
.u
.def
.section
->owner
,
3346 BFD_ASSERT (s
!= NULL
);
3348 rel
.r_offset
= (h
->root
.u
.def
.value
3349 + h
->root
.u
.def
.section
->output_section
->vma
3350 + h
->root
.u
.def
.section
->output_offset
);
3351 rel
.r_info
= ELF32_R_INFO (h
->dynindx
, R_ARM_COPY
);
3352 bfd_elf32_swap_reloc_out (output_bfd
, &rel
,
3353 ((Elf32_External_Rel
*) s
->contents
3358 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3359 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
3360 || strcmp (h
->root
.root
.string
, "_GLOBAL_OFFSET_TABLE_") == 0)
3361 sym
->st_shndx
= SHN_ABS
;
3366 /* Finish up the dynamic sections. */
3369 elf32_arm_finish_dynamic_sections (output_bfd
, info
)
3371 struct bfd_link_info
* info
;
3377 dynobj
= elf_hash_table (info
)->dynobj
;
3379 sgot
= bfd_get_section_by_name (dynobj
, ".got.plt");
3380 BFD_ASSERT (sgot
!= NULL
);
3381 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3383 if (elf_hash_table (info
)->dynamic_sections_created
)
3386 Elf32_External_Dyn
*dyncon
, *dynconend
;
3388 splt
= bfd_get_section_by_name (dynobj
, ".plt");
3389 BFD_ASSERT (splt
!= NULL
&& sdyn
!= NULL
);
3391 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
3392 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->_raw_size
);
3394 for (; dyncon
< dynconend
; dyncon
++)
3396 Elf_Internal_Dyn dyn
;
3400 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3413 s
= bfd_get_section_by_name (output_bfd
, name
);
3414 BFD_ASSERT (s
!= NULL
);
3415 dyn
.d_un
.d_ptr
= s
->vma
;
3416 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3420 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
3421 BFD_ASSERT (s
!= NULL
);
3422 if (s
->_cooked_size
!= 0)
3423 dyn
.d_un
.d_val
= s
->_cooked_size
;
3425 dyn
.d_un
.d_val
= s
->_raw_size
;
3426 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3430 /* My reading of the SVR4 ABI indicates that the
3431 procedure linkage table relocs (DT_JMPREL) should be
3432 included in the overall relocs (DT_REL). This is
3433 what Solaris does. However, UnixWare can not handle
3434 that case. Therefore, we override the DT_RELSZ entry
3435 here to make it not include the JMPREL relocs. Since
3436 the linker script arranges for .rel.plt to follow all
3437 other relocation sections, we don't have to worry
3438 about changing the DT_REL entry. */
3439 s
= bfd_get_section_by_name (output_bfd
, ".rel.plt");
3442 if (s
->_cooked_size
!= 0)
3443 dyn
.d_un
.d_val
-= s
->_cooked_size
;
3445 dyn
.d_un
.d_val
-= s
->_raw_size
;
3447 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
3452 /* Fill in the first entry in the procedure linkage table. */
3453 if (splt
->_raw_size
> 0)
3455 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[0], splt
->contents
+ 0);
3456 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[1], splt
->contents
+ 4);
3457 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[2], splt
->contents
+ 8);
3458 bfd_put_32 (output_bfd
, elf32_arm_plt0_entry
[3], splt
->contents
+ 12);
3461 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3462 really seem like the right value. */
3463 elf_section_data (splt
->output_section
)->this_hdr
.sh_entsize
= 4;
3466 /* Fill in the first three entries in the global offset table. */
3467 if (sgot
->_raw_size
> 0)
3470 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
);
3472 bfd_put_32 (output_bfd
,
3473 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
3475 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 4);
3476 bfd_put_32 (output_bfd
, (bfd_vma
) 0, sgot
->contents
+ 8);
3479 elf_section_data (sgot
->output_section
)->this_hdr
.sh_entsize
= 4;
3485 elf32_arm_post_process_headers (abfd
, link_info
)
3487 struct bfd_link_info
* link_info ATTRIBUTE_UNUSED
;
3489 Elf_Internal_Ehdr
* i_ehdrp
; /* ELF file header, internal form. */
3491 i_ehdrp
= elf_elfheader (abfd
);
3493 i_ehdrp
->e_ident
[EI_OSABI
] = ARM_ELF_OS_ABI_VERSION
;
3494 i_ehdrp
->e_ident
[EI_ABIVERSION
] = ARM_ELF_ABI_VERSION
;
3497 static enum elf_reloc_type_class
3498 elf32_arm_reloc_type_class (rela
)
3499 const Elf_Internal_Rela
*rela
;
3501 switch ((int) ELF32_R_TYPE (rela
->r_info
))
3503 case R_ARM_RELATIVE
:
3504 return reloc_class_relative
;
3505 case R_ARM_JUMP_SLOT
:
3506 return reloc_class_plt
;
3508 return reloc_class_copy
;
3510 return reloc_class_normal
;
3515 #define ELF_ARCH bfd_arch_arm
3516 #define ELF_MACHINE_CODE EM_ARM
3517 #define ELF_MAXPAGESIZE 0x8000
3519 #define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data
3520 #define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data
3521 #define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags
3522 #define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data
3523 #define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create
3524 #define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
3525 #define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line
3527 #define elf_backend_get_symbol_type elf32_arm_get_symbol_type
3528 #define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook
3529 #define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook
3530 #define elf_backend_check_relocs elf32_arm_check_relocs
3531 #define elf_backend_relocate_section elf32_arm_relocate_section
3532 #define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol
3533 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
3534 #define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol
3535 #define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections
3536 #define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections
3537 #define elf_backend_post_process_headers elf32_arm_post_process_headers
3538 #define elf_backend_reloc_type_class elf32_arm_reloc_type_class
3540 #define elf_backend_can_gc_sections 1
3541 #define elf_backend_plt_readonly 1
3542 #define elf_backend_want_got_plt 1
3543 #define elf_backend_want_plt_sym 0
3545 #define elf_backend_got_header_size 12
3546 #define elf_backend_plt_header_size PLT_ENTRY_SIZE
3548 #include "elf32-target.h"