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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [opcodes/] [z80-dis.c] - Blame information for rev 160

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1 18 khays
/* Print Z80 and R800 instructions
2
   Copyright 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
3
   Contributed by Arnold Metselaar <arnold_m@operamail.com>
4
 
5
   This file is part of the GNU opcodes library.
6
 
7
   This library is free software; you can redistribute it and/or modify
8
   it under the terms of the GNU General Public License as published by
9
   the Free Software Foundation; either version 3, or (at your option)
10
   any later version.
11
 
12
   It is distributed in the hope that it will be useful, but WITHOUT
13
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
15
   License for more details.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program; if not, write to the Free Software
19
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20
   MA 02110-1301, USA.  */
21
 
22
#include "sysdep.h"
23
#include "dis-asm.h"
24
#include <stdio.h>
25
 
26
struct buffer
27
{
28
  bfd_vma base;
29
  int n_fetch;
30
  int n_used;
31
  signed char data[4];
32
} ;
33
 
34
typedef int (*func)(struct buffer *, disassemble_info *, char *);
35
 
36
struct tab_elt
37
{
38
  unsigned char val;
39
  unsigned char mask;
40
  func          fp;
41
  char *        text;
42
} ;
43
 
44
#define TXTSIZ 24
45
/* Names of 16-bit registers.  */
46
static char * rr_str[] = { "bc", "de", "hl", "sp" };
47
/* Names of 8-bit registers.  */
48
static char * r_str[]  = { "b", "c", "d", "e", "h", "l", "(hl)", "a" };
49
/* Texts for condition codes.  */
50
static char * cc_str[] = { "nz", "z", "nc", "c", "po", "pe", "p", "m" };
51
/* Instruction names for 8-bit arithmetic, operand "a" is often implicit */
52
static char * arit_str[] =
53
{
54
  "add a,", "adc a,", "sub ", "sbc a,", "and ", "xor ", "or ", "cp "
55
} ;
56
 
57
static int
58
fetch_data (struct buffer *buf, disassemble_info * info, int n)
59
{
60
  int r;
61
 
62
  if (buf->n_fetch + n > 4)
63
    abort ();
64
 
65
  r = info->read_memory_func (buf->base + buf->n_fetch,
66
                              (unsigned char*) buf->data + buf->n_fetch,
67
                              n, info);
68
  if (r == 0)
69
    buf->n_fetch += n;
70
  return !r;
71
}
72
 
73
static int
74
prt (struct buffer *buf, disassemble_info * info, char *txt)
75
{
76
  info->fprintf_func (info->stream, "%s", txt);
77
  buf->n_used = buf->n_fetch;
78
  return 1;
79
}
80
 
81
static int
82
prt_e (struct buffer *buf, disassemble_info * info, char *txt)
83
{
84
  char e;
85
  int target_addr;
86
 
87
  if (fetch_data (buf, info, 1))
88
    {
89
      e = buf->data[1];
90
      target_addr = (buf->base + 2 + e) & 0xffff;
91
      buf->n_used = buf->n_fetch;
92
      info->fprintf_func (info->stream, "%s0x%04x", txt, target_addr);
93
    }
94
  else
95
    buf->n_used = -1;
96
 
97
  return buf->n_used;
98
}
99
 
100
static int
101
jr_cc (struct buffer *buf, disassemble_info * info, char *txt)
102
{
103
  char mytxt[TXTSIZ];
104
 
105
  snprintf (mytxt, TXTSIZ, txt, cc_str[(buf->data[0] >> 3) & 3]);
106
  return prt_e (buf, info, mytxt);
107
}
108
 
109
static int
110
prt_nn (struct buffer *buf, disassemble_info * info, char *txt)
111
{
112
  int nn;
113
  unsigned char *p;
114
 
115
  p = (unsigned char*) buf->data + buf->n_fetch;
116
  if (fetch_data (buf, info, 2))
117
    {
118
      nn = p[0] + (p[1] << 8);
119
      info->fprintf_func (info->stream, txt, nn);
120
      buf->n_used = buf->n_fetch;
121
    }
122
  else
123
    buf->n_used = -1;
124
  return buf->n_used;
125
}
126
 
127
static int
128
prt_rr_nn (struct buffer *buf, disassemble_info * info, char *txt)
129
{
130
  char mytxt[TXTSIZ];
131
  int rr;
132
 
133
  rr = (buf->data[buf->n_fetch - 1] >> 4) & 3;
134
  snprintf (mytxt, TXTSIZ, txt, rr_str[rr]);
135
  return prt_nn (buf, info, mytxt);
136
}
137
 
138
static int
139
prt_rr (struct buffer *buf, disassemble_info * info, char *txt)
140
{
141
  info->fprintf_func (info->stream, "%s%s", txt,
142
                      rr_str[(buf->data[buf->n_fetch - 1] >> 4) & 3]);
143
  buf->n_used = buf->n_fetch;
144
  return buf->n_used;
145
}
146
 
147
static int
148
prt_n (struct buffer *buf, disassemble_info * info, char *txt)
149
{
150
  int n;
151
  unsigned char *p;
152
 
153
  p = (unsigned char*) buf->data + buf->n_fetch;
154
 
155
  if (fetch_data (buf, info, 1))
156
    {
157
      n = p[0];
158
      info->fprintf_func (info->stream, txt, n);
159
      buf->n_used = buf->n_fetch;
160
    }
161
  else
162
    buf->n_used = -1;
163
 
164
  return buf->n_used;
165
}
166
 
167
static int
168
ld_r_n (struct buffer *buf, disassemble_info * info, char *txt)
169
{
170
  char mytxt[TXTSIZ];
171
 
172
  snprintf (mytxt, TXTSIZ, txt, r_str[(buf->data[0] >> 3) & 7]);
173
  return prt_n (buf, info, mytxt);
174
}
175
 
176
static int
177
prt_r (struct buffer *buf, disassemble_info * info, char *txt)
178
{
179
  info->fprintf_func (info->stream, txt,
180
                      r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7]);
181
  buf->n_used = buf->n_fetch;
182
  return buf->n_used;
183
}
184
 
185
static int
186
ld_r_r (struct buffer *buf, disassemble_info * info, char *txt)
187
{
188
  info->fprintf_func (info->stream, txt,
189
                      r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7],
190
                      r_str[buf->data[buf->n_fetch - 1] & 7]);
191
  buf->n_used = buf->n_fetch;
192
  return buf->n_used;
193
}
194
 
195
static int
196
arit_r (struct buffer *buf, disassemble_info * info, char *txt)
197
{
198
  info->fprintf_func (info->stream, txt,
199
                      arit_str[(buf->data[buf->n_fetch - 1] >> 3) & 7],
200
                      r_str[buf->data[buf->n_fetch - 1] & 7]);
201
  buf->n_used = buf->n_fetch;
202
  return buf->n_used;
203
}
204
 
205
static int
206
prt_cc (struct buffer *buf, disassemble_info * info, char *txt)
207
{
208
  info->fprintf_func (info->stream, "%s%s", txt,
209
                      cc_str[(buf->data[0] >> 3) & 7]);
210
  buf->n_used = buf->n_fetch;
211
  return buf->n_used;
212
}
213
 
214
static int
215
pop_rr (struct buffer *buf, disassemble_info * info, char *txt)
216
{
217
  static char *rr_stack[] = { "bc","de","hl","af"};
218
 
219
  info->fprintf_func (info->stream, "%s %s", txt,
220
                      rr_stack[(buf->data[0] >> 4) & 3]);
221
  buf->n_used = buf->n_fetch;
222
  return buf->n_used;
223
}
224
 
225
 
226
static int
227
jp_cc_nn (struct buffer *buf, disassemble_info * info, char *txt)
228
{
229
  char mytxt[TXTSIZ];
230
 
231
  snprintf (mytxt,TXTSIZ,
232
            "%s%s,0x%%04x", txt, cc_str[(buf->data[0] >> 3) & 7]);
233
  return prt_nn (buf, info, mytxt);
234
}
235
 
236
static int
237
arit_n (struct buffer *buf, disassemble_info * info, char *txt)
238
{
239
  char mytxt[TXTSIZ];
240
 
241
  snprintf (mytxt,TXTSIZ, txt, arit_str[(buf->data[0] >> 3) & 7]);
242
  return prt_n (buf, info, mytxt);
243
}
244
 
245
static int
246
rst (struct buffer *buf, disassemble_info * info, char *txt)
247
{
248
  info->fprintf_func (info->stream, txt, buf->data[0] & 0x38);
249
  buf->n_used = buf->n_fetch;
250
  return buf->n_used;
251
}
252
 
253
 
254
static int
255
cis (struct buffer *buf, disassemble_info * info, char *txt ATTRIBUTE_UNUSED)
256
{
257
  static char * opar[] = { "ld", "cp", "in", "out" };
258
  char * op;
259
  char c;
260
 
261
  c = buf->data[1];
262
  op = ((0x13 & c) == 0x13) ? "ot" : (opar[c & 3]);
263
  info->fprintf_func (info->stream,
264
                      "%s%c%s", op,
265
                      (c & 0x08) ? 'd' : 'i',
266
                      (c & 0x10) ? "r" : "");
267
  buf->n_used = 2;
268
  return buf->n_used;
269
}
270
 
271
static int
272
dump (struct buffer *buf, disassemble_info * info, char *txt)
273
{
274
  int i;
275
 
276
  info->fprintf_func (info->stream, "defb ");
277
  for (i = 0; txt[i]; ++i)
278
    info->fprintf_func (info->stream, i ? ", 0x%02x" : "0x%02x",
279
                        (unsigned char) buf->data[i]);
280
  buf->n_used = i;
281
  return buf->n_used;
282
}
283
 
284
/* Table to disassemble machine codes with prefix 0xED.  */
285
struct tab_elt opc_ed[] =
286
{
287
  { 0x70, 0xFF, prt, "in f,(c)" },
288
  { 0x70, 0xFF, dump, "xx" },
289
  { 0x40, 0xC7, prt_r, "in %s,(c)" },
290
  { 0x71, 0xFF, prt, "out (c),0" },
291
  { 0x70, 0xFF, dump, "xx" },
292
  { 0x41, 0xC7, prt_r, "out (c),%s" },
293
  { 0x42, 0xCF, prt_rr, "sbc hl," },
294
  { 0x43, 0xCF, prt_rr_nn, "ld (0x%%04x),%s" },
295
  { 0x44, 0xFF, prt, "neg" },
296
  { 0x45, 0xFF, prt, "retn" },
297
  { 0x46, 0xFF, prt, "im 0" },
298
  { 0x47, 0xFF, prt, "ld i,a" },
299
  { 0x4A, 0xCF, prt_rr, "adc hl," },
300
  { 0x4B, 0xCF, prt_rr_nn, "ld %s,(0x%%04x)" },
301
  { 0x4D, 0xFF, prt, "reti" },
302
  { 0x4F, 0xFF, prt, "ld r,a" },
303
  { 0x56, 0xFF, prt, "im 1" },
304
  { 0x57, 0xFF, prt, "ld a,i" },
305
  { 0x5E, 0xFF, prt, "im 2" },
306
  { 0x5F, 0xFF, prt, "ld a,r" },
307
  { 0x67, 0xFF, prt, "rrd" },
308
  { 0x6F, 0xFF, prt, "rld" },
309
  { 0xA0, 0xE4, cis, "" },
310
  { 0xC3, 0xFF, prt, "muluw hl,bc" },
311
  { 0xC5, 0xE7, prt_r, "mulub a,%s" },
312
  { 0xF3, 0xFF, prt, "muluw hl,sp" },
313
  { 0x00, 0x00, dump, "xx" }
314
};
315
 
316
static int
317
pref_ed (struct buffer * buf, disassemble_info * info,
318
         char* txt ATTRIBUTE_UNUSED)
319
{
320
  struct tab_elt *p;
321
 
322
  if (fetch_data(buf, info, 1))
323
    {
324
      for (p = opc_ed; p->val != (buf->data[1] & p->mask); ++p)
325
        ;
326
      p->fp (buf, info, p->text);
327
    }
328
  else
329
    buf->n_used = -1;
330
 
331
  return buf->n_used;
332
}
333
 
334
/* Instruction names for the instructions addressing single bits.  */
335
static char *cb1_str[] = { "", "bit", "res", "set"};
336
/* Instruction names for shifts and rotates.  */
337
static char *cb2_str[] =
338
{
339
  "rlc", "rrc", "rl", "rr", "sla", "sra", "sli", "srl"
340
};
341
 
342
static int
343
pref_cb (struct buffer * buf, disassemble_info * info,
344
         char* txt ATTRIBUTE_UNUSED)
345
{
346
  if (fetch_data (buf, info, 1))
347
    {
348
      buf->n_used = 2;
349
      if ((buf->data[1] & 0xc0) == 0)
350
        info->fprintf_func (info->stream, "%s %s",
351
                            cb2_str[(buf->data[1] >> 3) & 7],
352
                            r_str[buf->data[1] & 7]);
353
      else
354
        info->fprintf_func (info->stream, "%s %d,%s",
355
                            cb1_str[(buf->data[1] >> 6) & 3],
356
                            (buf->data[1] >> 3) & 7,
357
                            r_str[buf->data[1] & 7]);
358
    }
359
  else
360
    buf->n_used = -1;
361
 
362
  return buf->n_used;
363
}
364
 
365
static int
366
addvv (struct buffer * buf, disassemble_info * info, char* txt)
367
{
368
  info->fprintf_func (info->stream, "add %s,%s", txt, txt);
369
 
370
  return buf->n_used = buf->n_fetch;
371
}
372
 
373
static int
374
ld_v_v (struct buffer * buf, disassemble_info * info, char* txt)
375
{
376
  char mytxt[TXTSIZ];
377
 
378
  snprintf (mytxt, TXTSIZ, "ld %s%%s,%s%%s", txt, txt);
379
  return ld_r_r (buf, info, mytxt);
380
}
381
 
382
static int
383
prt_d (struct buffer *buf, disassemble_info * info, char *txt)
384
{
385
  int d;
386
  signed char *p;
387
 
388
  p = buf->data + buf->n_fetch;
389
 
390
  if (fetch_data (buf, info, 1))
391
    {
392
      d = p[0];
393
      info->fprintf_func (info->stream, txt, d);
394
      buf->n_used = buf->n_fetch;
395
    }
396
  else
397
    buf->n_used = -1;
398
 
399
  return buf->n_used;
400
}
401
 
402
static int
403
prt_d_n (struct buffer *buf, disassemble_info * info, char *txt)
404
{
405
  char mytxt[TXTSIZ];
406
  int d;
407
  signed char *p;
408
 
409
  p = buf->data + buf->n_fetch;
410
 
411
  if (fetch_data (buf, info, 1))
412
    {
413
      d = p[0];
414
      snprintf (mytxt, TXTSIZ, txt, d);
415
      return prt_n (buf, info, mytxt);
416
    }
417
  else
418
    buf->n_used = -1;
419
 
420
  return buf->n_used;
421
}
422
 
423
static int
424
arit_d (struct buffer *buf, disassemble_info * info, char *txt)
425
{
426
  char mytxt[TXTSIZ];
427
  signed char c;
428
 
429
  c = buf->data[buf->n_fetch - 1];
430
  snprintf (mytxt, TXTSIZ, txt, arit_str[(c >> 3) & 7]);
431
  return prt_d (buf, info, mytxt);
432
}
433
 
434
static int
435
ld_r_d (struct buffer *buf, disassemble_info * info, char *txt)
436
{
437
  char mytxt[TXTSIZ];
438
  signed char c;
439
 
440
  c = buf->data[buf->n_fetch - 1];
441
  snprintf (mytxt, TXTSIZ, txt, r_str[(c >> 3) & 7]);
442
  return prt_d (buf, info, mytxt);
443
}
444
 
445
static int
446
ld_d_r(struct buffer *buf, disassemble_info * info, char *txt)
447
{
448
  char mytxt[TXTSIZ];
449
  signed char c;
450
 
451
  c = buf->data[buf->n_fetch - 1];
452
  snprintf (mytxt, TXTSIZ, txt, r_str[c & 7]);
453
  return prt_d (buf, info, mytxt);
454
}
455
 
456
static int
457
pref_xd_cb (struct buffer * buf, disassemble_info * info, char* txt)
458
{
459
  if (fetch_data (buf, info, 2))
460
    {
461
      int d;
462
      char arg[TXTSIZ];
463
      signed char *p;
464
 
465
      buf->n_used = 4;
466
      p = buf->data;
467
      d = p[2];
468
 
469
      if (((p[3] & 0xC0) == 0x40) || ((p[3] & 7) == 0x06))
470
        snprintf (arg, TXTSIZ, "(%s%+d)", txt, d);
471
      else
472
        snprintf (arg, TXTSIZ, "(%s%+d),%s", txt, d, r_str[p[3] & 7]);
473
 
474
      if ((p[3] & 0xc0) == 0)
475
        info->fprintf_func (info->stream, "%s %s",
476
                            cb2_str[(buf->data[3] >> 3) & 7],
477
                            arg);
478
      else
479
        info->fprintf_func (info->stream, "%s %d,%s",
480
                            cb1_str[(buf->data[3] >> 6) & 3],
481
                            (buf->data[3] >> 3) & 7,
482
                            arg);
483
    }
484
  else
485
    buf->n_used = -1;
486
 
487
  return buf->n_used;
488
}
489
 
490
/* Table to disassemble machine codes with prefix 0xDD or 0xFD.  */
491
static struct tab_elt opc_ind[] =
492
{
493
  { 0x24, 0xF7, prt_r, "inc %s%%s" },
494
  { 0x25, 0xF7, prt_r, "dec %s%%s" },
495
  { 0x26, 0xF7, ld_r_n, "ld %s%%s,0x%%%%02x" },
496
  { 0x21, 0xFF, prt_nn, "ld %s,0x%%04x" },
497
  { 0x22, 0xFF, prt_nn, "ld (0x%%04x),%s" },
498
  { 0x2A, 0xFF, prt_nn, "ld %s,(0x%%04x)" },
499
  { 0x23, 0xFF, prt, "inc %s" },
500
  { 0x2B, 0xFF, prt, "dec %s" },
501
  { 0x29, 0xFF, addvv, "%s" },
502
  { 0x09, 0xCF, prt_rr, "add %s," },
503
  { 0x34, 0xFF, prt_d, "inc (%s%%+d)" },
504
  { 0x35, 0xFF, prt_d, "dec (%s%%+d)" },
505
  { 0x36, 0xFF, prt_d_n, "ld (%s%%+d),0x%%%%02x" },
506
 
507
  { 0x76, 0xFF, dump, "h" },
508
  { 0x46, 0xC7, ld_r_d, "ld %%s,(%s%%%%+d)" },
509
  { 0x70, 0xF8, ld_d_r, "ld (%s%%%%+d),%%s" },
510
  { 0x64, 0xF6, ld_v_v, "%s" },
511
  { 0x60, 0xF0, ld_r_r, "ld %s%%s,%%s" },
512
  { 0x44, 0xC6, ld_r_r, "ld %%s,%s%%s" },
513
 
514
  { 0x86, 0xC7, arit_d, "%%s(%s%%%%+d)" },
515
  { 0x84, 0xC6, arit_r, "%%s%s%%s" },
516
 
517
  { 0xE1, 0xFF, prt, "pop %s" },
518
  { 0xE5, 0xFF, prt, "push %s" },
519
  { 0xCB, 0xFF, pref_xd_cb, "%s" },
520
  { 0xE3, 0xFF, prt, "ex (sp),%s" },
521
  { 0xE9, 0xFF, prt, "jp (%s)" },
522
  { 0xF9, 0xFF, prt, "ld sp,%s" },
523
  { 0x00, 0x00, dump, "?" },
524
} ;
525
 
526
static int
527
pref_ind (struct buffer * buf, disassemble_info * info, char* txt)
528
{
529
  if (fetch_data (buf, info, 1))
530
    {
531
      char mytxt[TXTSIZ];
532
      struct tab_elt *p;
533
 
534
      for (p = opc_ind; p->val != (buf->data[1] & p->mask); ++p)
535
        ;
536
      snprintf (mytxt, TXTSIZ, p->text, txt);
537
      p->fp (buf, info, mytxt);
538
    }
539
  else
540
    buf->n_used = -1;
541
 
542
  return buf->n_used;
543
}
544
 
545
/* Table to disassemble machine codes without prefix.  */
546
static struct tab_elt opc_main[] =
547
{
548
  { 0x00, 0xFF, prt, "nop" },
549
  { 0x01, 0xCF, prt_rr_nn, "ld %s,0x%%04x" },
550
  { 0x02, 0xFF, prt, "ld (bc),a" },
551
  { 0x03, 0xCF, prt_rr, "inc " },
552
  { 0x04, 0xC7, prt_r, "inc %s" },
553
  { 0x05, 0xC7, prt_r, "dec %s" },
554
  { 0x06, 0xC7, ld_r_n, "ld %s,0x%%02x" },
555
  { 0x07, 0xFF, prt, "rlca" },
556
  { 0x08, 0xFF, prt, "ex af,af'" },
557
  { 0x09, 0xCF, prt_rr, "add hl," },
558
  { 0x0A, 0xFF, prt, "ld a,(bc)" },
559
  { 0x0B, 0xCF, prt_rr, "dec " },
560
  { 0x0F, 0xFF, prt, "rrca" },
561
  { 0x10, 0xFF, prt_e, "djnz " },
562
  { 0x12, 0xFF, prt, "ld (de),a" },
563
  { 0x17, 0xFF, prt, "rla" },
564
  { 0x18, 0xFF, prt_e, "jr "},
565
  { 0x1A, 0xFF, prt, "ld a,(de)" },
566
  { 0x1F, 0xFF, prt, "rra" },
567
  { 0x20, 0xE7, jr_cc, "jr %s,"},
568
  { 0x22, 0xFF, prt_nn, "ld (0x%04x),hl" },
569
  { 0x27, 0xFF, prt, "daa"},
570
  { 0x2A, 0xFF, prt_nn, "ld hl,(0x%04x)" },
571
  { 0x2F, 0xFF, prt, "cpl" },
572
  { 0x32, 0xFF, prt_nn, "ld (0x%04x),a" },
573
  { 0x37, 0xFF, prt, "scf" },
574
  { 0x3A, 0xFF, prt_nn, "ld a,(0x%04x)" },
575
  { 0x3F, 0xFF, prt, "ccf" },
576
 
577
  { 0x76, 0xFF, prt, "halt" },
578
  { 0x40, 0xC0, ld_r_r, "ld %s,%s"},
579
 
580
  { 0x80, 0xC0, arit_r, "%s%s" },
581
 
582
  { 0xC0, 0xC7, prt_cc, "ret " },
583
  { 0xC1, 0xCF, pop_rr, "pop" },
584
  { 0xC2, 0xC7, jp_cc_nn, "jp " },
585
  { 0xC3, 0xFF, prt_nn, "jp 0x%04x" },
586
  { 0xC4, 0xC7, jp_cc_nn, "call " },
587
  { 0xC5, 0xCF, pop_rr, "push" },
588
  { 0xC6, 0xC7, arit_n, "%s0x%%02x" },
589
  { 0xC7, 0xC7, rst, "rst 0x%02x" },
590
  { 0xC9, 0xFF, prt, "ret" },
591
  { 0xCB, 0xFF, pref_cb, "" },
592
  { 0xCD, 0xFF, prt_nn, "call 0x%04x" },
593
  { 0xD3, 0xFF, prt_n, "out (0x%02x),a" },
594
  { 0xD9, 0xFF, prt, "exx" },
595
  { 0xDB, 0xFF, prt_n, "in a,(0x%02x)" },
596
  { 0xDD, 0xFF, pref_ind, "ix" },
597
  { 0xE3, 0xFF, prt, "ex (sp),hl" },
598
  { 0xE9, 0xFF, prt, "jp (hl)" },
599
  { 0xEB, 0xFF, prt, "ex de,hl" },
600
  { 0xED, 0xFF, pref_ed, ""},
601
  { 0xF3, 0xFF, prt, "di" },
602
  { 0xF9, 0xFF, prt, "ld sp,hl" },
603
  { 0xFB, 0xFF, prt, "ei" },
604
  { 0xFD, 0xFF, pref_ind, "iy" },
605
  { 0x00, 0x00, prt, "????" },
606
} ;
607
 
608
int
609
print_insn_z80 (bfd_vma addr, disassemble_info * info)
610
{
611
  struct buffer buf;
612
  struct tab_elt *p;
613
 
614
  buf.base = addr;
615
  buf.n_fetch = 0;
616
  buf.n_used = 0;
617
 
618
  if (! fetch_data (& buf, info, 1))
619
    return -1;
620
 
621
  for (p = opc_main; p->val != (buf.data[0] & p->mask); ++p)
622
    ;
623
  p->fp (& buf, info, p->text);
624
 
625
  return buf.n_used;
626
}

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