1 /* BFD back-end for raw ARM a.out binaries.
2 Copyright 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005,
3 2007, 2009, 2010 Free Software Foundation, Inc.
4 Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
25 /* Avoid multiple definitions from aoutx if supporting standard a.out
26 as well as our own. */
27 /* Do not "beautify" the CONCAT* macro args. Traditional C will not
28 remove whitespace added here, and thus will fail to concatenate
30 #define NAME(x,y) CONCAT3 (aoutarm,_32_,y)
32 #define N_TXTADDR(x) \
33 ((N_MAGIC (x) == NMAGIC) \
35 : ((N_MAGIC (x) != ZMAGIC) \
37 : ((N_SHARED_LIB (x)) \
38 ? ((x).a_entry & ~(bfd_vma) (TARGET_PAGE_SIZE - 1)) \
39 : (bfd_vma) TEXT_START_ADDR)))
41 #define TEXT_START_ADDR 0x8000
42 #define TARGET_PAGE_SIZE 0x8000
43 #define SEGMENT_SIZE TARGET_PAGE_SIZE
44 #define DEFAULT_ARCH bfd_arch_arm
46 #define MY(OP) CONCAT2 (aoutarm_,OP)
47 #define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) && \
48 (((x).a_info & ~006000) != OMAGIC) && \
49 ((x).a_info != NMAGIC))
50 #define N_MAGIC(x) ((x).a_info & ~07200)
52 #define MY_bfd_reloc_type_lookup aoutarm_bfd_reloc_type_lookup
53 #define MY_bfd_reloc_name_lookup aoutarm_bfd_reloc_name_lookup
56 #include "aout/aout64.h"
59 static bfd_reloc_status_type
60 MY (fix_pcrel_26
) (bfd
*, arelent
*, asymbol
*, void *, asection
*, bfd
*, char **);
61 static bfd_reloc_status_type
62 MY (fix_pcrel_26_done
) (bfd
*, arelent
*, asymbol
*, void *, asection
*, bfd
*, char **);
64 reloc_howto_type
MY (howto_table
)[] =
66 /* Type rs size bsz pcrel bitpos ovrf sf name part_inpl
67 readmask setmask pcdone. */
68 HOWTO (0, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
, 0, "8", TRUE
,
69 0x000000ff, 0x000000ff, FALSE
),
70 HOWTO (1, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
, 0, "16", TRUE
,
71 0x0000ffff, 0x0000ffff, FALSE
),
72 HOWTO (2, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
, 0, "32", TRUE
,
73 0xffffffff, 0xffffffff, FALSE
),
74 HOWTO (3, 2, 2, 26, TRUE
, 0, complain_overflow_signed
, MY (fix_pcrel_26
),
75 "ARM26", TRUE
, 0x00ffffff, 0x00ffffff, TRUE
),
76 HOWTO (4, 0, 0, 8, TRUE
, 0, complain_overflow_signed
, 0, "DISP8", TRUE
,
77 0x000000ff, 0x000000ff, TRUE
),
78 HOWTO (5, 0, 1, 16, TRUE
, 0, complain_overflow_signed
, 0, "DISP16", TRUE
,
79 0x0000ffff, 0x0000ffff, TRUE
),
80 HOWTO (6, 0, 2, 32, TRUE
, 0, complain_overflow_signed
, 0, "DISP32", TRUE
,
81 0xffffffff, 0xffffffff, TRUE
),
82 HOWTO (7, 2, 2, 26, FALSE
, 0, complain_overflow_signed
,
83 MY (fix_pcrel_26_done
), "ARM26D", TRUE
, 0x0, 0x0,
86 HOWTO (9, 0, -1, 16, FALSE
, 0, complain_overflow_bitfield
, 0, "NEG16", TRUE
,
87 0x0000ffff, 0x0000ffff, FALSE
),
88 HOWTO (10, 0, -2, 32, FALSE
, 0, complain_overflow_bitfield
, 0, "NEG32", TRUE
,
89 0xffffffff, 0xffffffff, FALSE
)
92 #define RELOC_ARM_BITS_NEG_BIG ((unsigned int) 0x08)
93 #define RELOC_ARM_BITS_NEG_LITTLE ((unsigned int) 0x10)
95 static reloc_howto_type
*
96 MY (reloc_howto
) (bfd
*abfd
,
97 struct reloc_std_external
*rel
,
102 unsigned int r_length
;
103 unsigned int r_pcrel_done
;
108 if (bfd_header_big_endian (abfd
))
110 *r_index
= ((rel
->r_index
[0] << 16)
111 | (rel
->r_index
[1] << 8)
113 *r_extern
= (0 != (rel
->r_type
[0] & RELOC_STD_BITS_EXTERN_BIG
));
114 r_pcrel_done
= (0 != (rel
->r_type
[0] & RELOC_STD_BITS_PCREL_BIG
));
115 r_neg
= (0 != (rel
->r_type
[0] & RELOC_ARM_BITS_NEG_BIG
));
116 r_length
= ((rel
->r_type
[0] & RELOC_STD_BITS_LENGTH_BIG
)
117 >> RELOC_STD_BITS_LENGTH_SH_BIG
);
121 *r_index
= ((rel
->r_index
[2] << 16)
122 | (rel
->r_index
[1] << 8)
124 *r_extern
= (0 != (rel
->r_type
[0] & RELOC_STD_BITS_EXTERN_LITTLE
));
125 r_pcrel_done
= (0 != (rel
->r_type
[0] & RELOC_STD_BITS_PCREL_LITTLE
));
126 r_neg
= (0 != (rel
->r_type
[0] & RELOC_ARM_BITS_NEG_LITTLE
));
127 r_length
= ((rel
->r_type
[0] & RELOC_STD_BITS_LENGTH_LITTLE
)
128 >> RELOC_STD_BITS_LENGTH_SH_LITTLE
);
130 howto_index
= r_length
+ 4 * r_pcrel_done
+ 8 * r_neg
;
131 if (howto_index
== 3)
134 return MY (howto_table
) + howto_index
;
137 #define MY_reloc_howto(BFD, REL, IN, EX, PC) \
138 MY (reloc_howto) (BFD, REL, &IN, &EX, &PC)
141 MY (put_reloc
) (bfd
*abfd
,
145 reloc_howto_type
*howto
,
146 struct reloc_std_external
*reloc
)
148 unsigned int r_length
;
152 PUT_WORD (abfd
, value
, reloc
->r_address
);
153 /* Size as a power of two. */
154 r_length
= howto
->size
;
156 /* Special case for branch relocations. */
157 if (howto
->type
== 3 || howto
->type
== 7)
160 r_pcrel
= howto
->type
& 4; /* PC Relative done? */
161 r_neg
= howto
->type
& 8; /* Negative relocation. */
163 if (bfd_header_big_endian (abfd
))
165 reloc
->r_index
[0] = r_index
>> 16;
166 reloc
->r_index
[1] = r_index
>> 8;
167 reloc
->r_index
[2] = r_index
;
169 ((r_extern
? RELOC_STD_BITS_EXTERN_BIG
: 0)
170 | (r_pcrel
? RELOC_STD_BITS_PCREL_BIG
: 0)
171 | (r_neg
? RELOC_ARM_BITS_NEG_BIG
: 0)
172 | (r_length
<< RELOC_STD_BITS_LENGTH_SH_BIG
));
176 reloc
->r_index
[2] = r_index
>> 16;
177 reloc
->r_index
[1] = r_index
>> 8;
178 reloc
->r_index
[0] = r_index
;
180 ((r_extern
? RELOC_STD_BITS_EXTERN_LITTLE
: 0)
181 | (r_pcrel
? RELOC_STD_BITS_PCREL_LITTLE
: 0)
182 | (r_neg
? RELOC_ARM_BITS_NEG_LITTLE
: 0)
183 | (r_length
<< RELOC_STD_BITS_LENGTH_SH_LITTLE
));
187 #define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \
188 MY (put_reloc) (BFD, EXT, IDX, VAL, HOWTO, RELOC)
191 MY (relocatable_reloc
) (reloc_howto_type
*howto
,
193 struct reloc_std_external
*reloc
,
197 if (howto
->type
== 3)
200 & (bfd_header_big_endian (abfd
)
201 ? RELOC_STD_BITS_EXTERN_BIG
: RELOC_STD_BITS_EXTERN_LITTLE
))
202 /* The reloc is still external, so don't modify anything. */
207 /* Change the r_pcrel value -- on the ARM, this bit is set once the
208 relocation is done. */
209 if (bfd_header_big_endian (abfd
))
210 reloc
->r_type
[0] |= RELOC_STD_BITS_PCREL_BIG
;
212 reloc
->r_type
[0] |= RELOC_STD_BITS_PCREL_LITTLE
;
215 else if (howto
->type
== 7)
219 #define MY_relocatable_reloc(HOW, BFD, REL, AMOUNT, ADDR) \
220 MY (relocatable_reloc) (HOW, BFD, REL, &(AMOUNT), ADDR)
222 static bfd_reloc_status_type
223 MY (fix_pcrel_26_done
) (bfd
*abfd ATTRIBUTE_UNUSED
,
224 arelent
*reloc_entry ATTRIBUTE_UNUSED
,
225 asymbol
*symbol ATTRIBUTE_UNUSED
,
226 void * data ATTRIBUTE_UNUSED
,
227 asection
*input_section ATTRIBUTE_UNUSED
,
228 bfd
*output_bfd ATTRIBUTE_UNUSED
,
229 char **error_message ATTRIBUTE_UNUSED
)
231 /* This is dead simple at present. */
235 static bfd_reloc_status_type
236 MY (fix_pcrel_26
) (bfd
*abfd
,
237 arelent
*reloc_entry
,
240 asection
*input_section
,
242 char **error_message ATTRIBUTE_UNUSED
)
245 bfd_size_type addr
= reloc_entry
->address
;
246 bfd_vma target
= bfd_get_32 (abfd
, (bfd_byte
*) data
+ addr
);
247 bfd_reloc_status_type flag
= bfd_reloc_ok
;
249 /* If this is an undefined symbol, return error. */
250 if (symbol
->section
== &bfd_und_section
251 && (symbol
->flags
& BSF_WEAK
) == 0)
252 return output_bfd
? bfd_reloc_ok
: bfd_reloc_undefined
;
254 /* If the sections are different, and we are doing a partial relocation,
255 just ignore it for now. */
256 if (symbol
->section
->name
!= input_section
->name
257 && output_bfd
!= NULL
)
260 relocation
= (target
& 0x00ffffff) << 2;
261 relocation
= (relocation
^ 0x02000000) - 0x02000000; /* Sign extend. */
262 relocation
+= symbol
->value
;
263 relocation
+= symbol
->section
->output_section
->vma
;
264 relocation
+= symbol
->section
->output_offset
;
265 relocation
+= reloc_entry
->addend
;
266 relocation
-= input_section
->output_section
->vma
;
267 relocation
-= input_section
->output_offset
;
270 return bfd_reloc_overflow
;
272 /* Check for overflow. */
273 if (relocation
& 0x02000000)
275 if ((relocation
& ~ (bfd_vma
) 0x03ffffff) != ~ (bfd_vma
) 0x03ffffff)
276 flag
= bfd_reloc_overflow
;
278 else if (relocation
& ~ (bfd_vma
) 0x03ffffff)
279 flag
= bfd_reloc_overflow
;
281 target
&= ~ (bfd_vma
) 0x00ffffff;
282 target
|= (relocation
>> 2) & 0x00ffffff;
283 bfd_put_32 (abfd
, target
, (bfd_byte
*) data
+ addr
);
285 /* Now the ARM magic... Change the reloc type so that it is marked as done.
286 Strictly this is only necessary if we are doing a partial relocation. */
287 reloc_entry
->howto
= &MY (howto_table
)[7];
292 static reloc_howto_type
*
293 MY (bfd_reloc_type_lookup
) (bfd
*abfd
,
294 bfd_reloc_code_real_type code
)
296 #define ASTD(i,j) case i: return & MY (howto_table)[j]
298 if (code
== BFD_RELOC_CTOR
)
299 switch (bfd_arch_bits_per_address (abfd
))
310 ASTD (BFD_RELOC_16
, 1);
311 ASTD (BFD_RELOC_32
, 2);
312 ASTD (BFD_RELOC_ARM_PCREL_BRANCH
, 3);
313 ASTD (BFD_RELOC_8_PCREL
, 4);
314 ASTD (BFD_RELOC_16_PCREL
, 5);
315 ASTD (BFD_RELOC_32_PCREL
, 6);
321 static reloc_howto_type
*
322 MY (bfd_reloc_name_lookup
) (bfd
*abfd ATTRIBUTE_UNUSED
,
328 i
< sizeof (MY (howto_table
)) / sizeof (MY (howto_table
)[0]);
330 if (MY (howto_table
)[i
].name
!= NULL
331 && strcasecmp (MY (howto_table
)[i
].name
, r_name
) == 0)
332 return &MY (howto_table
)[i
];
337 #define MY_swap_std_reloc_in MY (swap_std_reloc_in)
338 #define MY_swap_std_reloc_out MY (swap_std_reloc_out)
339 #define MY_get_section_contents _bfd_generic_get_section_contents
341 void MY_swap_std_reloc_in (bfd
*, struct reloc_std_external
*, arelent
*, asymbol
**, bfd_size_type
);
342 void MY_swap_std_reloc_out (bfd
*, arelent
*, struct reloc_std_external
*);
347 MY_swap_std_reloc_in (bfd
*abfd
,
348 struct reloc_std_external
*bytes
,
351 bfd_size_type symcount ATTRIBUTE_UNUSED
)
356 struct aoutdata
*su
= &(abfd
->tdata
.aout_data
->a
);
358 cache_ptr
->address
= H_GET_32 (abfd
, bytes
->r_address
);
360 cache_ptr
->howto
= MY_reloc_howto (abfd
, bytes
, r_index
, r_extern
, r_pcrel
);
366 MY_swap_std_reloc_out (bfd
*abfd
,
368 struct reloc_std_external
*natptr
)
371 asymbol
*sym
= *(g
->sym_ptr_ptr
);
375 int r_neg
= 0; /* Negative relocs use the BASEREL bit. */
376 asection
*output_section
= sym
->section
->output_section
;
378 PUT_WORD (abfd
, g
->address
, natptr
->r_address
);
380 r_length
= g
->howto
->size
; /* Size as a power of two. */
383 r_length
= -r_length
;
387 r_pcrel
= (int) g
->howto
->pc_relative
; /* Relative to PC? */
389 /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the
390 relocation has been done already (Only for the 26-bit one I think). */
391 if (g
->howto
->type
== 3)
396 else if (g
->howto
->type
== 7)
402 /* Name was clobbered by aout_write_syms to be symbol index. */
404 /* If this relocation is relative to a symbol then set the
405 r_index to the symbols index, and the r_extern bit.
407 Absolute symbols can come in in two ways, either as an offset
408 from the abs section, or as a symbol which has an abs value.
409 check for that here. */
411 if (bfd_is_com_section (output_section
)
412 || output_section
== &bfd_abs_section
413 || output_section
== &bfd_und_section
)
415 if (bfd_abs_section
.symbol
== sym
)
417 /* Whoops, looked like an abs symbol, but is really an offset
418 from the abs section. */
424 /* Fill in symbol. */
426 r_index
= (*(g
->sym_ptr_ptr
))->KEEPIT
;
431 /* Just an ordinary section. */
433 r_index
= output_section
->target_index
;
436 /* Now the fun stuff. */
437 if (bfd_header_big_endian (abfd
))
439 natptr
->r_index
[0] = r_index
>> 16;
440 natptr
->r_index
[1] = r_index
>> 8;
441 natptr
->r_index
[2] = r_index
;
443 ( (r_extern
? RELOC_STD_BITS_EXTERN_BIG
: 0)
444 | (r_pcrel
? RELOC_STD_BITS_PCREL_BIG
: 0)
445 | (r_neg
? RELOC_ARM_BITS_NEG_BIG
: 0)
446 | (r_length
<< RELOC_STD_BITS_LENGTH_SH_BIG
));
450 natptr
->r_index
[2] = r_index
>> 16;
451 natptr
->r_index
[1] = r_index
>> 8;
452 natptr
->r_index
[0] = r_index
;
454 ( (r_extern
? RELOC_STD_BITS_EXTERN_LITTLE
: 0)
455 | (r_pcrel
? RELOC_STD_BITS_PCREL_LITTLE
: 0)
456 | (r_neg
? RELOC_ARM_BITS_NEG_LITTLE
: 0)
457 | (r_length
<< RELOC_STD_BITS_LENGTH_SH_LITTLE
));
461 #define MY_BFD_TARGET
463 #include "aout-target.h"
465 extern const bfd_target aout_arm_big_vec
;
467 const bfd_target aout_arm_little_vec
=
469 "a.out-arm-little", /* Name. */
470 bfd_target_aout_flavour
,
471 BFD_ENDIAN_LITTLE
, /* Target byte order (little). */
472 BFD_ENDIAN_LITTLE
, /* Target headers byte order (little). */
473 (HAS_RELOC
| EXEC_P
| /* Object flags. */
474 HAS_LINENO
| HAS_DEBUG
|
475 HAS_SYMS
| HAS_LOCALS
| DYNAMIC
| WP_TEXT
| D_PAGED
),
476 (SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
| SEC_CODE
| SEC_DATA
),
477 MY_symbol_leading_char
,
478 AR_PAD_CHAR
, /* AR_pad_char. */
479 15, /* AR_max_namelen. */
480 bfd_getl64
, bfd_getl_signed_64
, bfd_putl64
,
481 bfd_getl32
, bfd_getl_signed_32
, bfd_putl32
,
482 bfd_getl16
, bfd_getl_signed_16
, bfd_putl16
, /* Data. */
483 bfd_getl64
, bfd_getl_signed_64
, bfd_putl64
,
484 bfd_getl32
, bfd_getl_signed_32
, bfd_putl32
,
485 bfd_getl16
, bfd_getl_signed_16
, bfd_putl16
, /* Headers. */
486 {_bfd_dummy_target
, MY_object_p
, /* bfd_check_format. */
487 bfd_generic_archive_p
, MY_core_file_p
},
488 {bfd_false
, MY_mkobject
, /* bfd_set_format. */
489 _bfd_generic_mkarchive
, bfd_false
},
490 {bfd_false
, MY_write_object_contents
, /* bfd_write_contents. */
491 _bfd_write_archive_contents
, bfd_false
},
493 BFD_JUMP_TABLE_GENERIC (MY
),
494 BFD_JUMP_TABLE_COPY (MY
),
495 BFD_JUMP_TABLE_CORE (MY
),
496 BFD_JUMP_TABLE_ARCHIVE (MY
),
497 BFD_JUMP_TABLE_SYMBOLS (MY
),
498 BFD_JUMP_TABLE_RELOCS (MY
),
499 BFD_JUMP_TABLE_WRITE (MY
),
500 BFD_JUMP_TABLE_LINK (MY
),
501 BFD_JUMP_TABLE_DYNAMIC (MY
),
505 (void *) MY_backend_data
,
508 const bfd_target aout_arm_big_vec
=
510 "a.out-arm-big", /* Name. */
511 bfd_target_aout_flavour
,
512 BFD_ENDIAN_BIG
, /* Target byte order (big). */
513 BFD_ENDIAN_BIG
, /* Target headers byte order (big). */
514 (HAS_RELOC
| EXEC_P
| /* Object flags. */
515 HAS_LINENO
| HAS_DEBUG
|
516 HAS_SYMS
| HAS_LOCALS
| DYNAMIC
| WP_TEXT
| D_PAGED
),
517 (SEC_HAS_CONTENTS
| SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
| SEC_CODE
| SEC_DATA
),
518 MY_symbol_leading_char
,
519 AR_PAD_CHAR
, /* AR_pad_char. */
520 15, /* AR_max_namelen. */
521 bfd_getb64
, bfd_getb_signed_64
, bfd_putb64
,
522 bfd_getb32
, bfd_getb_signed_32
, bfd_putb32
,
523 bfd_getb16
, bfd_getb_signed_16
, bfd_putb16
, /* Data. */
524 bfd_getb64
, bfd_getb_signed_64
, bfd_putb64
,
525 bfd_getb32
, bfd_getb_signed_32
, bfd_putb32
,
526 bfd_getb16
, bfd_getb_signed_16
, bfd_putb16
, /* Headers. */
527 {_bfd_dummy_target
, MY_object_p
, /* bfd_check_format. */
528 bfd_generic_archive_p
, MY_core_file_p
},
529 {bfd_false
, MY_mkobject
, /* bfd_set_format. */
530 _bfd_generic_mkarchive
, bfd_false
},
531 {bfd_false
, MY_write_object_contents
, /* bfd_write_contents. */
532 _bfd_write_archive_contents
, bfd_false
},
534 BFD_JUMP_TABLE_GENERIC (MY
),
535 BFD_JUMP_TABLE_COPY (MY
),
536 BFD_JUMP_TABLE_CORE (MY
),
537 BFD_JUMP_TABLE_ARCHIVE (MY
),
538 BFD_JUMP_TABLE_SYMBOLS (MY
),
539 BFD_JUMP_TABLE_RELOCS (MY
),
540 BFD_JUMP_TABLE_WRITE (MY
),
541 BFD_JUMP_TABLE_LINK (MY
),
542 BFD_JUMP_TABLE_DYNAMIC (MY
),
544 & aout_arm_little_vec
,
546 (void *) MY_backend_data
,