aboutsummaryrefslogtreecommitdiff
path: root/bfd/cpu-arm.c
blob: 903ad847b872d25b2e5d5c6d296c38f278a63662 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
/* BFD support for the ARM processor
   Copyright (C) 1994-2020 Free Software Foundation, Inc.
   Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "libiberty.h"
#include "cpu-arm.h"

/* This routine is provided two arch_infos and works out which ARM
   machine which would be compatible with both and returns a pointer
   to its info structure.  */

static const bfd_arch_info_type *
compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b)
{
  /* If a & b are for different architecture we can do nothing.  */
  if (a->arch != b->arch)
      return NULL;

  /* If a & b are for the same machine then all is well.  */
  if (a->mach == b->mach)
    return a;

  /* Otherwise if either a or b is the 'default' machine
     then it can be polymorphed into the other.  */
  if (a->the_default)
    return b;

  if (b->the_default)
    return a;

  /* So far all newer ARM architecture cores are
     supersets of previous cores.  */
  if (a->mach < b->mach)
    return b;
  else if (a->mach > b->mach)
    return a;

  /* Never reached!  */
  return NULL;
}

static struct
{
  unsigned int mach;
  char *       name;
}
processors[] =
{
  { bfd_mach_arm_2,	  "arm2"	    },
  { bfd_mach_arm_2a,	  "arm250"	    },
  { bfd_mach_arm_2a,	  "arm3"	    },
  { bfd_mach_arm_3,	  "arm6"	    },
  { bfd_mach_arm_3,	  "arm60"	    },
  { bfd_mach_arm_3,	  "arm600"	    },
  { bfd_mach_arm_3,	  "arm610"	    },
  { bfd_mach_arm_3,	  "arm620"	    },
  { bfd_mach_arm_3,	  "arm7"	    },
  { bfd_mach_arm_3,	  "arm70"	    },
  { bfd_mach_arm_3,	  "arm700"	    },
  { bfd_mach_arm_3,	  "arm700i"	    },
  { bfd_mach_arm_3,	  "arm710"	    },
  { bfd_mach_arm_3,	  "arm7100"	    },
  { bfd_mach_arm_3,	  "arm710c"	    },
  { bfd_mach_arm_4T,	  "arm710t"	    },
  { bfd_mach_arm_3,	  "arm720"	    },
  { bfd_mach_arm_4T,	  "arm720t"	    },
  { bfd_mach_arm_4T,	  "arm740t"	    },
  { bfd_mach_arm_3,	  "arm7500"	    },
  { bfd_mach_arm_3,	  "arm7500fe"	    },
  { bfd_mach_arm_3,	  "arm7d"	    },
  { bfd_mach_arm_3,	  "arm7di"	    },
  { bfd_mach_arm_3M,	  "arm7dm"	    },
  { bfd_mach_arm_3M,	  "arm7dmi"	    },
  { bfd_mach_arm_4T,	  "arm7t"	    },
  { bfd_mach_arm_4T,	  "arm7tdmi"	    },
  { bfd_mach_arm_4T,	  "arm7tdmi-s"	    },
  { bfd_mach_arm_3M,	  "arm7m"	    },
  { bfd_mach_arm_4,	  "arm8"	    },
  { bfd_mach_arm_4,	  "arm810"	    },
  { bfd_mach_arm_4,	  "arm9"	    },
  { bfd_mach_arm_4T,	  "arm920"	    },
  { bfd_mach_arm_4T,	  "arm920t"	    },
  { bfd_mach_arm_4T,	  "arm922t"	    },
  { bfd_mach_arm_5TEJ,	  "arm926ej"	    },
  { bfd_mach_arm_5TEJ,	  "arm926ejs"	    },
  { bfd_mach_arm_5TEJ,	  "arm926ej-s"	    },
  { bfd_mach_arm_4T,	  "arm940t"	    },
  { bfd_mach_arm_5TE,	  "arm946e"	    },
  { bfd_mach_arm_5TE,	  "arm946e-r0"	    },
  { bfd_mach_arm_5TE,	  "arm946e-s"	    },
  { bfd_mach_arm_5TE,	  "arm966e"	    },
  { bfd_mach_arm_5TE,	  "arm966e-r0"	    },
  { bfd_mach_arm_5TE,	  "arm966e-s"	    },
  { bfd_mach_arm_5TE,	  "arm968e-s"	    },
  { bfd_mach_arm_5TE,	  "arm9e"	    },
  { bfd_mach_arm_5TE,	  "arm9e-r0"	    },
  { bfd_mach_arm_4T,	  "arm9tdmi"	    },
  { bfd_mach_arm_5TE,	  "arm1020"	    },
  { bfd_mach_arm_5T,	  "arm1020t"	    },
  { bfd_mach_arm_5TE,	  "arm1020e"	    },
  { bfd_mach_arm_5TE,	  "arm1022e"	    },
  { bfd_mach_arm_5TEJ,	  "arm1026ejs"	    },
  { bfd_mach_arm_5TEJ,	  "arm1026ej-s"	    },
  { bfd_mach_arm_5TE,	  "arm10e"	    },
  { bfd_mach_arm_5T,	  "arm10t"	    },
  { bfd_mach_arm_5T,	  "arm10tdmi"	    },
  { bfd_mach_arm_6,	  "arm1136j-s"	    },
  { bfd_mach_arm_6,	  "arm1136js"	    },
  { bfd_mach_arm_6,	  "arm1136jf-s"	    },
  { bfd_mach_arm_6,	  "arm1136jfs"	    },
  { bfd_mach_arm_6KZ,	  "arm1176jz-s"	    },
  { bfd_mach_arm_6KZ,	  "arm1176jzf-s"    },
  { bfd_mach_arm_6T2,	  "arm1156t2-s"	    },
  { bfd_mach_arm_6T2,	  "arm1156t2f-s"    },
  { bfd_mach_arm_7,	  "cortex-a5"	    },
  { bfd_mach_arm_7,	  "cortex-a7"	    },
  { bfd_mach_arm_7,	  "cortex-a8"	    },
  { bfd_mach_arm_7,	  "cortex-a9"	    },
  { bfd_mach_arm_7,	  "cortex-a12"	    },
  { bfd_mach_arm_7,	  "cortex-a15"	    },
  { bfd_mach_arm_7,	  "cortex-a17"	    },
  { bfd_mach_arm_8,	  "cortex-a32"	    },
  { bfd_mach_arm_8,	  "cortex-a35"	    },
  { bfd_mach_arm_8,	  "cortex-a53"	    },
  { bfd_mach_arm_8,	  "cortex-a55"	    },
  { bfd_mach_arm_8,	  "cortex-a57"	    },
  { bfd_mach_arm_8,	  "cortex-a72"	    },
  { bfd_mach_arm_8,	  "cortex-a73"	    },
  { bfd_mach_arm_8,	  "cortex-a75"	    },
  { bfd_mach_arm_8,	  "cortex-a76"	    },
  { bfd_mach_arm_8,	  "cortex-a76ae"    },
  { bfd_mach_arm_8,	  "cortex-a77"	    },
  { bfd_mach_arm_6SM,	  "cortex-m0"	    },
  { bfd_mach_arm_6SM,	  "cortex-m0plus"   },
  { bfd_mach_arm_6SM,	  "cortex-m1"	    },
  { bfd_mach_arm_8M_BASE, "cortex-m23"	    },
  { bfd_mach_arm_7,	  "cortex-m3"	    },
  { bfd_mach_arm_8M_MAIN, "cortex-m33"	    },
  { bfd_mach_arm_8M_MAIN, "cortex-m35p"	    },
  { bfd_mach_arm_7EM,	  "cortex-m4"	    },
  { bfd_mach_arm_7EM,	  "cortex-m7"	    },
  { bfd_mach_arm_7,	  "cortex-r4"	    },
  { bfd_mach_arm_7,	  "cortex-r4f"	    },
  { bfd_mach_arm_7,	  "cortex-r5"	    },
  { bfd_mach_arm_8R,	  "cortex-r52"	    },
  { bfd_mach_arm_7,	  "cortex-r7"	    },
  { bfd_mach_arm_7,	  "cortex-r8"	    },
  { bfd_mach_arm_4T,	  "ep9312"	    },
  { bfd_mach_arm_8,	  "exynos-m1"	    },
  { bfd_mach_arm_4,	  "fa526"	    },
  { bfd_mach_arm_5TE,	  "fa606te"	    },
  { bfd_mach_arm_5TE,	  "fa616te"	    },
  { bfd_mach_arm_4,	  "fa626"	    },
  { bfd_mach_arm_5TE,	  "fa626te"	    },
  { bfd_mach_arm_5TE,	  "fa726te"	    },
  { bfd_mach_arm_5TE,	  "fmp626"	    },
  { bfd_mach_arm_XScale,  "i80200"	    },
  { bfd_mach_arm_7,	  "marvell-pj4"	    },
  { bfd_mach_arm_7,	  "marvell-whitney" },
  { bfd_mach_arm_6K,	  "mpcore"	    },
  { bfd_mach_arm_6K,	  "mpcorenovfp"	    },
  { bfd_mach_arm_4,	  "sa1"		    },
  { bfd_mach_arm_4,	  "strongarm"	    },
  { bfd_mach_arm_4,	  "strongarm1"	    },
  { bfd_mach_arm_4,	  "strongarm110"    },
  { bfd_mach_arm_4,	  "strongarm1100"   },
  { bfd_mach_arm_4,	  "strongarm1110"   },
  { bfd_mach_arm_XScale,  "xscale"	    },
  { bfd_mach_arm_8,	  "xgene1"	    },
  { bfd_mach_arm_8,	  "xgene2"	    },
  { bfd_mach_arm_ep9312,  "ep9312"	    },
  { bfd_mach_arm_iWMMXt,  "iwmmxt"	    },
  { bfd_mach_arm_iWMMXt2, "iwmmxt2"	    },
  { bfd_mach_arm_unknown, "arm_any"	    }
};

static bfd_boolean
scan (const struct bfd_arch_info *info, const char *string)
{
  int  i;

  /* First test for an exact match.  */
  if (strcasecmp (string, info->printable_name) == 0)
    return TRUE;

  /* Next check for a processor name instead of an Architecture name.  */
  for (i = sizeof (processors) / sizeof (processors[0]); i--;)
    {
      if (strcasecmp (string, processors [i].name) == 0)
	break;
    }

  if (i != -1 && info->mach == processors [i].mach)
    return TRUE;

  /* Finally check for the default architecture.  */
  if (strcasecmp (string, "arm") == 0)
    return info->the_default;

  return FALSE;
}

#define N(number, print, default, next)  \
{  32, 32, 8, bfd_arch_arm, number, "arm", print, 4, default, compatible, \
    scan, bfd_arch_default_fill, next, 0 }

static const bfd_arch_info_type arch_info_struct[] =
{
  N (bfd_mach_arm_2,         "armv2",          FALSE, & arch_info_struct[1]),
  N (bfd_mach_arm_2a,        "armv2a",         FALSE, & arch_info_struct[2]),
  N (bfd_mach_arm_3,         "armv3",          FALSE, & arch_info_struct[3]),
  N (bfd_mach_arm_3M,        "armv3m",         FALSE, & arch_info_struct[4]),
  N (bfd_mach_arm_4,         "armv4",          FALSE, & arch_info_struct[5]),
  N (bfd_mach_arm_4T,        "armv4t",         FALSE, & arch_info_struct[6]),
  N (bfd_mach_arm_5,         "armv5",          FALSE, & arch_info_struct[7]),
  N (bfd_mach_arm_5T,        "armv5t",         FALSE, & arch_info_struct[8]),
  N (bfd_mach_arm_5TE,       "armv5te",        FALSE, & arch_info_struct[9]),
  N (bfd_mach_arm_XScale,    "xscale",         FALSE, & arch_info_struct[10]),
  N (bfd_mach_arm_ep9312,    "ep9312",         FALSE, & arch_info_struct[11]),
  N (bfd_mach_arm_iWMMXt,    "iwmmxt",         FALSE, & arch_info_struct[12]),
  N (bfd_mach_arm_iWMMXt2,   "iwmmxt2",        FALSE, & arch_info_struct[13]),
  N (bfd_mach_arm_5TEJ,      "armv5tej",       FALSE, & arch_info_struct[14]),
  N (bfd_mach_arm_6,         "armv6",          FALSE, & arch_info_struct[15]),
  N (bfd_mach_arm_6KZ,       "armv6kz",        FALSE, & arch_info_struct[16]),
  N (bfd_mach_arm_6T2,       "armv6t2",        FALSE, & arch_info_struct[17]),
  N (bfd_mach_arm_6K,        "armv6k",         FALSE, & arch_info_struct[18]),
  N (bfd_mach_arm_7,         "armv7",          FALSE, & arch_info_struct[19]),
  N (bfd_mach_arm_6M,        "armv6-m",        FALSE, & arch_info_struct[20]),
  N (bfd_mach_arm_6SM,       "armv6s-m",       FALSE, & arch_info_struct[21]),
  N (bfd_mach_arm_7EM,       "armv7e-m",       FALSE, & arch_info_struct[22]),
  N (bfd_mach_arm_8,         "armv8-a",        FALSE, & arch_info_struct[23]),
  N (bfd_mach_arm_8R,        "armv8-r",        FALSE, & arch_info_struct[24]),
  N (bfd_mach_arm_8M_BASE,   "armv8-m.base",   FALSE, & arch_info_struct[25]),
  N (bfd_mach_arm_8M_MAIN,   "armv8-m.main",   FALSE, & arch_info_struct[26]),
  N (bfd_mach_arm_8_1M_MAIN, "armv8.1-m.main", FALSE, & arch_info_struct[27]),
  N (bfd_mach_arm_unknown,   "arm_any",        FALSE, NULL)
};

const bfd_arch_info_type bfd_arm_arch =
  N (0, "arm", TRUE, & arch_info_struct[0]);

/* Support functions used by both the COFF and ELF versions of the ARM port.  */

/* Handle the merging of the 'machine' settings of input file IBFD
   and an output file OBFD.  These values actually represent the
   different possible ARM architecture variants.
   Returns TRUE if they were merged successfully or FALSE otherwise.  */

bfd_boolean
bfd_arm_merge_machines (bfd *ibfd, bfd *obfd)
{
  unsigned int in  = bfd_get_mach (ibfd);
  unsigned int out = bfd_get_mach (obfd);

  /* If the output architecture is unknown, we now have a value to set.  */
  if (out == bfd_mach_arm_unknown)
    bfd_set_arch_mach (obfd, bfd_arch_arm, in);

  /* If the input architecture is unknown,
     then so must be the output architecture.  */
  else if (in == bfd_mach_arm_unknown)
    /* FIXME: We ought to have some way to
       override this on the command line.  */
    bfd_set_arch_mach (obfd, bfd_arch_arm, bfd_mach_arm_unknown);

  /* If they are the same then nothing needs to be done.  */
  else if (out == in)
    ;

  /* Otherwise the general principle that a earlier architecture can be
     linked with a later architecture to produce a binary that will execute
     on the later architecture.

     We fail however if we attempt to link a Cirrus EP9312 binary with an
     Intel XScale binary, since these architecture have co-processors which
     will not both be present on the same physical hardware.  */
  else if (in == bfd_mach_arm_ep9312
	   && (out == bfd_mach_arm_XScale
	       || out == bfd_mach_arm_iWMMXt
	       || out == bfd_mach_arm_iWMMXt2))
    {
      /* xgettext: c-format */
      _bfd_error_handler (_("error: %pB is compiled for the EP9312, "
			    "whereas %pB is compiled for XScale"),
			  ibfd, obfd);
      bfd_set_error (bfd_error_wrong_format);
      return FALSE;
    }
  else if (out == bfd_mach_arm_ep9312
	   && (in == bfd_mach_arm_XScale
	       || in == bfd_mach_arm_iWMMXt
	       || in == bfd_mach_arm_iWMMXt2))
    {
      /* xgettext: c-format */
      _bfd_error_handler (_("error: %pB is compiled for the EP9312, "
			    "whereas %pB is compiled for XScale"),
			  obfd, ibfd);
      bfd_set_error (bfd_error_wrong_format);
      return FALSE;
    }
  else if (in > out)
    bfd_set_arch_mach (obfd, bfd_arch_arm, in);
  /* else
     Nothing to do.  */

  return TRUE;
}

typedef struct
{
  unsigned char	namesz[4];	/* Size of entry's owner string.  */
  unsigned char	descsz[4];	/* Size of the note descriptor.  */
  unsigned char	type[4];	/* Interpretation of the descriptor.  */
  char		name[1];	/* Start of the name+desc data.  */
} arm_Note;

static bfd_boolean
arm_check_note (bfd *abfd,
		bfd_byte *buffer,
		bfd_size_type buffer_size,
		const char *expected_name,
		char **description_return)
{
  unsigned long namesz;
  unsigned long descsz;
  unsigned long type;
  char *	descr;

  if (buffer_size < offsetof (arm_Note, name))
    return FALSE;

  /* We have to extract the values this way to allow for a
     host whose endian-ness is different from the target.  */
  namesz = bfd_get_32 (abfd, buffer);
  descsz = bfd_get_32 (abfd, buffer + offsetof (arm_Note, descsz));
  type   = bfd_get_32 (abfd, buffer + offsetof (arm_Note, type));
  descr  = (char *) buffer + offsetof (arm_Note, name);

  /* Check for buffer overflow.  */
  if (namesz + descsz + offsetof (arm_Note, name) > buffer_size)
    return FALSE;

  if (expected_name == NULL)
    {
      if (namesz != 0)
	return FALSE;
    }
  else
    {
      if (namesz != ((strlen (expected_name) + 1 + 3) & ~3))
	return FALSE;

      if (strcmp (descr, expected_name) != 0)
	return FALSE;

      descr += (namesz + 3) & ~3;
    }

  /* FIXME: We should probably check the type as well.  */
  (void) type;

  if (description_return != NULL)
    * description_return = descr;

  return TRUE;
}

#define NOTE_ARCH_STRING	"arch: "

bfd_boolean
bfd_arm_update_notes (bfd *abfd, const char *note_section)
{
  asection *	 arm_arch_section;
  bfd_size_type	 buffer_size;
  bfd_byte *	 buffer;
  char *	 arch_string;
  char *	 expected;

  /* Look for a note section.  If one is present check the architecture
     string encoded in it, and set it to the current architecture if it is
     different.  */
  arm_arch_section = bfd_get_section_by_name (abfd, note_section);

  if (arm_arch_section == NULL)
    return TRUE;

  buffer_size = arm_arch_section->size;
  if (buffer_size == 0)
    return FALSE;

  if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer))
    goto FAIL;

  /* Parse the note.  */
  if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string))
    goto FAIL;

  /* Check the architecture in the note against the architecture of the bfd.
     Newer architectures versions should not be added here as build attribute
     are a better mechanism to convey ISA used.  */
  switch (bfd_get_mach (abfd))
    {
    default:
    case bfd_mach_arm_unknown: expected = "unknown"; break;
    case bfd_mach_arm_2:       expected = "armv2"; break;
    case bfd_mach_arm_2a:      expected = "armv2a"; break;
    case bfd_mach_arm_3:       expected = "armv3"; break;
    case bfd_mach_arm_3M:      expected = "armv3M"; break;
    case bfd_mach_arm_4:       expected = "armv4"; break;
    case bfd_mach_arm_4T:      expected = "armv4t"; break;
    case bfd_mach_arm_5:       expected = "armv5"; break;
    case bfd_mach_arm_5T:      expected = "armv5t"; break;
    case bfd_mach_arm_5TE:     expected = "armv5te"; break;
    case bfd_mach_arm_XScale:  expected = "XScale"; break;
    case bfd_mach_arm_ep9312:  expected = "ep9312"; break;
    case bfd_mach_arm_iWMMXt:  expected = "iWMMXt"; break;
    case bfd_mach_arm_iWMMXt2: expected = "iWMMXt2"; break;
    }

  if (strcmp (arch_string, expected) != 0)
    {
      strcpy ((char *) buffer + (offsetof (arm_Note, name)
				 + ((strlen (NOTE_ARCH_STRING) + 3) & ~3)),
	      expected);

      if (! bfd_set_section_contents (abfd, arm_arch_section, buffer,
				      (file_ptr) 0, buffer_size))
	{
	  _bfd_error_handler
	    /* xgettext: c-format */
	    (_("warning: unable to update contents of %s section in %pB"),
	     note_section, abfd);
	  goto FAIL;
	}
    }

  free (buffer);
  return TRUE;

 FAIL:
  if (buffer != NULL)
    free (buffer);
  return FALSE;
}


static struct
{
  const char * string;
  unsigned int mach;
}

/* Newer architectures versions should not be added here as build attribute are
   a better mechanism to convey ISA used.  */
architectures[] =
{
  { "armv2",   bfd_mach_arm_2 },
  { "armv2a",  bfd_mach_arm_2a },
  { "armv3",   bfd_mach_arm_3 },
  { "armv3M",  bfd_mach_arm_3M },
  { "armv4",   bfd_mach_arm_4 },
  { "armv4t",  bfd_mach_arm_4T },
  { "armv5",   bfd_mach_arm_5 },
  { "armv5t",  bfd_mach_arm_5T },
  { "armv5te", bfd_mach_arm_5TE },
  { "XScale",  bfd_mach_arm_XScale },
  { "ep9312",  bfd_mach_arm_ep9312 },
  { "iWMMXt",  bfd_mach_arm_iWMMXt },
  { "iWMMXt2", bfd_mach_arm_iWMMXt2 },
  { "arm_any", bfd_mach_arm_unknown }
};

/* Extract the machine number stored in a note section.  */
unsigned int
bfd_arm_get_mach_from_notes (bfd *abfd, const char *note_section)
{
  asection *	 arm_arch_section;
  bfd_size_type	 buffer_size;
  bfd_byte *	 buffer;
  char *	 arch_string;
  int		 i;

  /* Look for a note section.  If one is present check the architecture
     string encoded in it, and set it to the current architecture if it is
     different.  */
  arm_arch_section = bfd_get_section_by_name (abfd, note_section);

  if (arm_arch_section == NULL)
    return bfd_mach_arm_unknown;

  buffer_size = arm_arch_section->size;
  if (buffer_size == 0)
    return bfd_mach_arm_unknown;

  if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer))
    goto FAIL;

  /* Parse the note.  */
  if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string))
    goto FAIL;

  /* Interpret the architecture string.  */
  for (i = ARRAY_SIZE (architectures); i--;)
    if (strcmp (arch_string, architectures[i].string) == 0)
      {
	free (buffer);
	return architectures[i].mach;
      }

 FAIL:
  if (buffer != NULL)
    free (buffer);
  return bfd_mach_arm_unknown;
}

bfd_boolean
bfd_is_arm_special_symbol_name (const char * name, int type)
{
  /* The ARM compiler outputs several obsolete forms.  Recognize them
     in addition to the standard $a, $t and $d.  We are somewhat loose
     in what we accept here, since the full set is not documented.  */
  if (!name || name[0] != '$')
    return FALSE;
  if (name[1] == 'a' || name[1] == 't' || name[1] == 'd')
    type &= BFD_ARM_SPECIAL_SYM_TYPE_MAP;
  else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p')
    type &= BFD_ARM_SPECIAL_SYM_TYPE_TAG;
  else if (name[1] >= 'a' && name[1] <= 'z')
    type &= BFD_ARM_SPECIAL_SYM_TYPE_OTHER;
  else
    return FALSE;

  return (type != 0 && (name[2] == 0 || name[2] == '.'));
}