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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [opcodes/] [z80-dis.c] - Blame information for rev 156

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1 38 julius
/* Print Z80 and R800 instructions
2
   Copyright 2005, 2007 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
 
132
  snprintf (mytxt, TXTSIZ, txt, rr_str[(buf->data[0] >> 4) & 3]);
133
  return prt_nn (buf, info, mytxt);
134
}
135
 
136
static int
137
prt_rr (struct buffer *buf, disassemble_info * info, char *txt)
138
{
139
  info->fprintf_func (info->stream, "%s%s", txt,
140
                      rr_str[(buf->data[buf->n_fetch - 1] >> 4) & 3]);
141
  buf->n_used = buf->n_fetch;
142
  return buf->n_used;
143
}
144
 
145
static int
146
prt_n (struct buffer *buf, disassemble_info * info, char *txt)
147
{
148
  int n;
149
  unsigned char *p;
150
 
151
  p = (unsigned char*) buf->data + buf->n_fetch;
152
 
153
  if (fetch_data (buf, info, 1))
154
    {
155
      n = p[0];
156
      info->fprintf_func (info->stream, txt, n);
157
      buf->n_used = buf->n_fetch;
158
    }
159
  else
160
    buf->n_used = -1;
161
 
162
  return buf->n_used;
163
}
164
 
165
static int
166
ld_r_n (struct buffer *buf, disassemble_info * info, char *txt)
167
{
168
  char mytxt[TXTSIZ];
169
 
170
  snprintf (mytxt, TXTSIZ, txt, r_str[(buf->data[0] >> 3) & 7]);
171
  return prt_n (buf, info, mytxt);
172
}
173
 
174
static int
175
prt_r (struct buffer *buf, disassemble_info * info, char *txt)
176
{
177
  info->fprintf_func (info->stream, txt,
178
                      r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7]);
179
  buf->n_used = buf->n_fetch;
180
  return buf->n_used;
181
}
182
 
183
static int
184
ld_r_r (struct buffer *buf, disassemble_info * info, char *txt)
185
{
186
  info->fprintf_func (info->stream, txt,
187
                      r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7],
188
                      r_str[buf->data[buf->n_fetch - 1] & 7]);
189
  buf->n_used = buf->n_fetch;
190
  return buf->n_used;
191
}
192
 
193
static int
194
arit_r (struct buffer *buf, disassemble_info * info, char *txt)
195
{
196
  info->fprintf_func (info->stream, txt,
197
                      arit_str[(buf->data[buf->n_fetch - 1] >> 3) & 7],
198
                      r_str[buf->data[buf->n_fetch - 1] & 7]);
199
  buf->n_used = buf->n_fetch;
200
  return buf->n_used;
201
}
202
 
203
static int
204
prt_cc (struct buffer *buf, disassemble_info * info, char *txt)
205
{
206
  info->fprintf_func (info->stream, "%s%s", txt,
207
                      cc_str[(buf->data[0] >> 3) & 7]);
208
  buf->n_used = buf->n_fetch;
209
  return buf->n_used;
210
}
211
 
212
static int
213
pop_rr (struct buffer *buf, disassemble_info * info, char *txt)
214
{
215
  static char *rr_stack[] = { "bc","de","hl","af"};
216
 
217
  info->fprintf_func (info->stream, "%s %s", txt,
218
                      rr_stack[(buf->data[0] >> 4) & 3]);
219
  buf->n_used = buf->n_fetch;
220
  return buf->n_used;
221
}
222
 
223
 
224
static int
225
jp_cc_nn (struct buffer *buf, disassemble_info * info, char *txt)
226
{
227
  char mytxt[TXTSIZ];
228
 
229
  snprintf (mytxt,TXTSIZ,
230
            "%s%s,0x%%04x", txt, cc_str[(buf->data[0] >> 3) & 7]);
231
  return prt_nn (buf, info, mytxt);
232
}
233
 
234
static int
235
arit_n (struct buffer *buf, disassemble_info * info, char *txt)
236
{
237
  char mytxt[TXTSIZ];
238
 
239
  snprintf (mytxt,TXTSIZ, txt, arit_str[(buf->data[0] >> 3) & 7]);
240
  return prt_n (buf, info, mytxt);
241
}
242
 
243
static int
244
rst (struct buffer *buf, disassemble_info * info, char *txt)
245
{
246
  info->fprintf_func (info->stream, txt, buf->data[0] & 0x38);
247
  buf->n_used = buf->n_fetch;
248
  return buf->n_used;
249
}
250
 
251
 
252
static int
253
cis (struct buffer *buf, disassemble_info * info, char *txt ATTRIBUTE_UNUSED)
254
{
255
  static char * opar[] = { "ld", "cp", "in", "out" };
256
  char * op;
257
  char c;
258
 
259
  c = buf->data[1];
260
  op = ((0x13 & c) == 0x13) ? "ot" : (opar[c & 3]);
261
  info->fprintf_func (info->stream,
262
                      "%s%c%s", op,
263
                      (c & 0x08) ? 'd' : 'i',
264
                      (c & 0x10) ? "r" : "");
265
  buf->n_used = 2;
266
  return buf->n_used;
267
}
268
 
269
static int
270
dump (struct buffer *buf, disassemble_info * info, char *txt)
271
{
272
  int i;
273
 
274
  info->fprintf_func (info->stream, "defb ");
275
  for (i = 0; txt[i]; ++i)
276
    info->fprintf_func (info->stream, i ? ", 0x%02x" : "0x%02x",
277
                        (unsigned char) buf->data[i]);
278
  buf->n_used = i;
279
  return buf->n_used;
280
}
281
 
282
/* Table to disassemble machine codes with prefix 0xED.  */
283
struct tab_elt opc_ed[] =
284
{
285
  { 0x70, 0xFF, prt, "in f,(c)" },
286
  { 0x70, 0xFF, dump, "xx" },
287
  { 0x40, 0xC7, prt_r, "in %s,(c)" },
288
  { 0x71, 0xFF, prt, "out (c),0" },
289
  { 0x70, 0xFF, dump, "xx" },
290
  { 0x41, 0xC7, prt_r, "out (c),%s" },
291
  { 0x42, 0xCF, prt_rr, "sbc hl," },
292
  { 0x43, 0xCF, prt_rr_nn, "ld (0x%%04x),%s" },
293
  { 0x44, 0xFF, prt, "neg" },
294
  { 0x45, 0xFF, prt, "retn" },
295
  { 0x46, 0xFF, prt, "im 0" },
296
  { 0x47, 0xFF, prt, "ld i,a" },
297
  { 0x4A, 0xCF, prt_rr, "adc hl," },
298
  { 0x4B, 0xCF, prt_rr_nn, "ld %s,(0x%%04x)" },
299
  { 0x4D, 0xFF, prt, "reti" },
300
  { 0x56, 0xFF, prt, "im 1" },
301
  { 0x57, 0xFF, prt, "ld a,i" },
302
  { 0x5E, 0xFF, prt, "im 2" },
303
  { 0x67, 0xFF, prt, "rrd" },
304
  { 0x6F, 0xFF, prt, "rld" },
305
  { 0xA0, 0xE4, cis, "" },
306
  { 0xC3, 0xFF, prt, "muluw hl,bc" },
307
  { 0xC5, 0xE7, prt_r, "mulub a,%s" },
308
  { 0xF3, 0xFF, prt, "muluw hl,sp" },
309
  { 0x00, 0x00, dump, "xx" }
310
};
311
 
312
static int
313
pref_ed (struct buffer * buf, disassemble_info * info,
314
         char* txt ATTRIBUTE_UNUSED)
315
{
316
  struct tab_elt *p;
317
 
318
  if (fetch_data(buf, info, 1))
319
    {
320
      for (p = opc_ed; p->val != (buf->data[1] & p->mask); ++p)
321
        ;
322
      p->fp (buf, info, p->text);
323
    }
324
  else
325
    buf->n_used = -1;
326
 
327
  return buf->n_used;
328
}
329
 
330
/* Instruction names for the instructions addressing single bits.  */
331
static char *cb1_str[] = { "", "bit", "res", "set"};
332
/* Instruction names for shifts and rotates.  */
333
static char *cb2_str[] =
334
{
335
  "rlc", "rrc", "rl", "rr", "sla", "sra", "sli", "srl"
336
};
337
 
338
static int
339
pref_cb (struct buffer * buf, disassemble_info * info,
340
         char* txt ATTRIBUTE_UNUSED)
341
{
342
  if (fetch_data (buf, info, 1))
343
    {
344
      buf->n_used = 2;
345
      if ((buf->data[1] & 0xc0) == 0)
346
        info->fprintf_func (info->stream, "%s %s",
347
                            cb2_str[(buf->data[1] >> 3) & 7],
348
                            r_str[buf->data[1] & 7]);
349
      else
350
        info->fprintf_func (info->stream, "%s %d,%s",
351
                            cb1_str[(buf->data[1] >> 6) & 3],
352
                            (buf->data[1] >> 3) & 7,
353
                            r_str[buf->data[1] & 7]);
354
    }
355
  else
356
    buf->n_used = -1;
357
 
358
  return buf->n_used;
359
}
360
 
361
static int
362
addvv (struct buffer * buf, disassemble_info * info, char* txt)
363
{
364
  info->fprintf_func (info->stream, "add %s,%s", txt, txt);
365
 
366
  return buf->n_used = buf->n_fetch;
367
}
368
 
369
static int
370
ld_v_v (struct buffer * buf, disassemble_info * info, char* txt)
371
{
372
  char mytxt[TXTSIZ];
373
 
374
  snprintf (mytxt, TXTSIZ, "ld %s%%s,%s%%s", txt, txt);
375
  return ld_r_r (buf, info, mytxt);
376
}
377
 
378
static int
379
prt_d (struct buffer *buf, disassemble_info * info, char *txt)
380
{
381
  int d;
382
  signed char *p;
383
 
384
  p = buf->data + buf->n_fetch;
385
 
386
  if (fetch_data (buf, info, 1))
387
    {
388
      d = p[0];
389
      info->fprintf_func (info->stream, txt, d);
390
      buf->n_used = buf->n_fetch;
391
    }
392
  else
393
    buf->n_used = -1;
394
 
395
  return buf->n_used;
396
}
397
 
398
static int
399
prt_d_n (struct buffer *buf, disassemble_info * info, char *txt)
400
{
401
  char mytxt[TXTSIZ];
402
  int d;
403
  signed char *p;
404
 
405
  p = buf->data + buf->n_fetch;
406
 
407
  if (fetch_data (buf, info, 1))
408
    {
409
      d = p[0];
410
      snprintf (mytxt, TXTSIZ, txt, d);
411
      return prt_n (buf, info, mytxt);
412
    }
413
  else
414
    buf->n_used = -1;
415
 
416
  return buf->n_used;
417
}
418
 
419
static int
420
arit_d (struct buffer *buf, disassemble_info * info, char *txt)
421
{
422
  char mytxt[TXTSIZ];
423
  signed char c;
424
 
425
  c = buf->data[buf->n_fetch - 1];
426
  snprintf (mytxt, TXTSIZ, txt, arit_str[(c >> 3) & 7]);
427
  return prt_d (buf, info, mytxt);
428
}
429
 
430
static int
431
ld_r_d (struct buffer *buf, disassemble_info * info, char *txt)
432
{
433
  char mytxt[TXTSIZ];
434
  signed char c;
435
 
436
  c = buf->data[buf->n_fetch - 1];
437
  snprintf (mytxt, TXTSIZ, txt, r_str[(c >> 3) & 7]);
438
  return prt_d (buf, info, mytxt);
439
}
440
 
441
static int
442
ld_d_r(struct buffer *buf, disassemble_info * info, char *txt)
443
{
444
  char mytxt[TXTSIZ];
445
  signed char c;
446
 
447
  c = buf->data[buf->n_fetch - 1];
448
  snprintf (mytxt, TXTSIZ, txt, r_str[c & 7]);
449
  return prt_d (buf, info, mytxt);
450
}
451
 
452
static int
453
pref_xd_cb (struct buffer * buf, disassemble_info * info, char* txt)
454
{
455
  if (fetch_data (buf, info, 2))
456
    {
457
      int d;
458
      char arg[TXTSIZ];
459
      signed char *p;
460
 
461
      buf->n_used = 4;
462
      p = buf->data;
463
      d = p[2];
464
 
465
      if (((p[3] & 0xC0) == 0x40) || ((p[3] & 7) == 0x06))
466
        snprintf (arg, TXTSIZ, "(%s%+d)", txt, d);
467
      else
468
        snprintf (arg, TXTSIZ, "(%s%+d),%s", txt, d, r_str[p[3] & 7]);
469
 
470
      if ((p[3] & 0xc0) == 0)
471
        info->fprintf_func (info->stream, "%s %s",
472
                            cb2_str[(buf->data[3] >> 3) & 7],
473
                            arg);
474
      else
475
        info->fprintf_func (info->stream, "%s %d,%s",
476
                            cb1_str[(buf->data[3] >> 6) & 3],
477
                            (buf->data[3] >> 3) & 7,
478
                            arg);
479
    }
480
  else
481
    buf->n_used = -1;
482
 
483
  return buf->n_used;
484
}
485
 
486
/* Table to disassemble machine codes with prefix 0xDD or 0xFD.  */
487
static struct tab_elt opc_ind[] =
488
{
489
  { 0x24, 0xF7, prt_r, "inc %s%%s" },
490
  { 0x25, 0xF7, prt_r, "dec %s%%s" },
491
  { 0x26, 0xF7, ld_r_n, "ld %s%%s,0x%%%%02x" },
492
  { 0x21, 0xFF, prt_nn, "ld %s,0x%%04x" },
493
  { 0x22, 0xFF, prt_nn, "ld (0x%%04x),%s" },
494
  { 0x2A, 0xFF, prt_nn, "ld %s,(0x%%04x)" },
495
  { 0x23, 0xFF, prt, "inc %s" },
496
  { 0x2B, 0xFF, prt, "dec %s" },
497
  { 0x29, 0xFF, addvv, "%s" },
498
  { 0x09, 0xCF, prt_rr, "add %s," },
499
  { 0x34, 0xFF, prt_d, "inc (%s%%+d)" },
500
  { 0x35, 0xFF, prt_d, "dec (%s%%+d)" },
501
  { 0x36, 0xFF, prt_d_n, "ld (%s%%+d),0x%%%%02x" },
502
 
503
  { 0x76, 0xFF, dump, "h" },
504
  { 0x46, 0xC7, ld_r_d, "ld %%s,(%s%%%%+d)" },
505
  { 0x70, 0xF8, ld_d_r, "ld (%s%%%%+d),%%s" },
506
  { 0x64, 0xF6, ld_v_v, "%s" },
507
  { 0x60, 0xF0, ld_r_r, "ld %s%%s,%%s" },
508
  { 0x44, 0xC6, ld_r_r, "ld %%s,%s%%s" },
509
 
510
  { 0x86, 0xC7, arit_d, "%%s(%s%%%%+d)" },
511
  { 0x84, 0xC6, arit_r, "%%s%s%%s" },
512
 
513
  { 0xE1, 0xFF, prt, "pop %s" },
514
  { 0xE5, 0xFF, prt, "push %s" },
515
  { 0xCB, 0xFF, pref_xd_cb, "%s" },
516
  { 0xE3, 0xFF, prt, "ex (sp),%s" },
517
  { 0xE9, 0xFF, prt, "jp (%s)" },
518
  { 0xF9, 0xFF, prt, "ld sp,%s" },
519
  { 0x00, 0x00, dump, "?" },
520
} ;
521
 
522
static int
523
pref_ind (struct buffer * buf, disassemble_info * info, char* txt)
524
{
525
  if (fetch_data (buf, info, 1))
526
    {
527
      char mytxt[TXTSIZ];
528
      struct tab_elt *p;
529
 
530
      for (p = opc_ind; p->val != (buf->data[1] & p->mask); ++p)
531
        ;
532
      snprintf (mytxt, TXTSIZ, p->text, txt);
533
      p->fp (buf, info, mytxt);
534
    }
535
  else
536
    buf->n_used = -1;
537
 
538
  return buf->n_used;
539
}
540
 
541
/* Table to disassemble machine codes without prefix.  */
542
static struct tab_elt opc_main[] =
543
{
544
  { 0x00, 0xFF, prt, "nop" },
545
  { 0x01, 0xCF, prt_rr_nn, "ld %s,0x%%04x" },
546
  { 0x02, 0xFF, prt, "ld (bc),a" },
547
  { 0x03, 0xCF, prt_rr, "inc " },
548
  { 0x04, 0xC7, prt_r, "inc %s" },
549
  { 0x05, 0xC7, prt_r, "dec %s" },
550
  { 0x06, 0xC7, ld_r_n, "ld %s,0x%%02x" },
551
  { 0x07, 0xFF, prt, "rlca" },
552
  { 0x08, 0xFF, prt, "ex af,af'" },
553
  { 0x09, 0xCF, prt_rr, "add hl," },
554
  { 0x0A, 0xFF, prt, "ld a,(bc)" },
555
  { 0x0B, 0xCF, prt_rr, "dec " },
556
  { 0x0F, 0xFF, prt, "rrca" },
557
  { 0x10, 0xFF, prt_e, "djnz " },
558
  { 0x12, 0xFF, prt, "ld (de),a" },
559
  { 0x17, 0xFF, prt, "rla" },
560
  { 0x18, 0xFF, prt_e, "jr "},
561
  { 0x1A, 0xFF, prt, "ld a,(de)" },
562
  { 0x1F, 0xFF, prt, "rra" },
563
  { 0x20, 0xE7, jr_cc, "jr %s,"},
564
  { 0x22, 0xFF, prt_nn, "ld (0x%04x),hl" },
565
  { 0x27, 0xFF, prt, "daa"},
566
  { 0x2A, 0xFF, prt_nn, "ld hl,(0x%04x)" },
567
  { 0x2F, 0xFF, prt, "cpl" },
568
  { 0x32, 0xFF, prt_nn, "ld (0x%04x),a" },
569
  { 0x37, 0xFF, prt, "scf" },
570
  { 0x3A, 0xFF, prt_nn, "ld a,(0x%04x)" },
571
  { 0x3F, 0xFF, prt, "ccf" },
572
 
573
  { 0x76, 0xFF, prt, "halt" },
574
  { 0x40, 0xC0, ld_r_r, "ld %s,%s"},
575
 
576
  { 0x80, 0xC0, arit_r, "%s%s" },
577
 
578
  { 0xC0, 0xC7, prt_cc, "ret " },
579
  { 0xC1, 0xCF, pop_rr, "pop" },
580
  { 0xC2, 0xC7, jp_cc_nn, "jp " },
581
  { 0xC3, 0xFF, prt_nn, "jp 0x%04x" },
582
  { 0xC4, 0xC7, jp_cc_nn, "call " },
583
  { 0xC5, 0xCF, pop_rr, "push" },
584
  { 0xC6, 0xC7, arit_n, "%s0x%%02x" },
585
  { 0xC7, 0xC7, rst, "rst 0x%02x" },
586
  { 0xC9, 0xFF, prt, "ret" },
587
  { 0xCB, 0xFF, pref_cb, "" },
588
  { 0xCD, 0xFF, prt_nn, "call 0x%04x" },
589
  { 0xD3, 0xFF, prt_n, "out (0x%02x),a" },
590
  { 0xD9, 0xFF, prt, "exx" },
591
  { 0xDB, 0xFF, prt_n, "in a,(0x%02x)" },
592
  { 0xDD, 0xFF, pref_ind, "ix" },
593
  { 0xE3, 0xFF, prt, "ex (sp),hl" },
594
  { 0xE9, 0xFF, prt, "jp (hl)" },
595
  { 0xEB, 0xFF, prt, "ex de,hl" },
596
  { 0xED, 0xFF, pref_ed, ""},
597
  { 0xF3, 0xFF, prt, "di" },
598
  { 0xF9, 0xFF, prt, "ld sp,hl" },
599
  { 0xFB, 0xFF, prt, "ei" },
600
  { 0xFD, 0xFF, pref_ind, "iy" },
601
  { 0x00, 0x00, prt, "????" },
602
} ;
603
 
604
int
605
print_insn_z80 (bfd_vma addr, disassemble_info * info)
606
{
607
  struct buffer buf;
608
  struct tab_elt *p;
609
 
610
  buf.base = addr;
611
  buf.n_fetch = 0;
612
  buf.n_used = 0;
613
 
614
  if (! fetch_data (& buf, info, 1))
615
    return -1;
616
 
617
  for (p = opc_main; p->val != (buf.data[0] & p->mask); ++p)
618
    ;
619
  p->fp (& buf, info, p->text);
620
 
621
  return buf.n_used;
622
}

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