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[/] [or1k/] [trunk/] [gdb-5.0/] [opcodes/] [z8k-dis.c] - Blame information for rev 106

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1 106 markom
/* Disassemble z8000 code.
2
   Copyright 1992, 1993, 1995, 1998 Free Software Foundation, Inc.
3
 
4
This file is part of GNU Binutils.
5
 
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.
10
 
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.
15
 
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.  */
19
 
20
#include <ansidecl.h>
21
#include "sysdep.h"
22
#include "dis-asm.h"
23
 
24
#define DEFINE_TABLE
25
#include "z8k-opc.h"
26
 
27
 
28
#include <setjmp.h>
29
 
30
 
31
typedef struct
32
{
33
  /* These are all indexed by nibble number (i.e only every other entry
34
     of bytes is used, and every 4th entry of words).  */
35
  unsigned char nibbles[24];
36
  unsigned char bytes[24];
37
  unsigned short words[24];
38
 
39
  /* Nibble number of first word not yet fetched.  */
40
  int max_fetched;
41
  bfd_vma insn_start;
42
  jmp_buf bailout;
43
 
44
  long tabl_index;
45
  char instr_asmsrc[80];
46
  unsigned long arg_reg[0x0f];
47
  unsigned long immediate;
48
  unsigned long displacement;
49
  unsigned long address;
50
  unsigned long cond_code;
51
  unsigned long ctrl_code;
52
  unsigned long flags;
53
  unsigned long interrupts;
54
}
55
instr_data_s;
56
 
57
/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
58
   to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
59
   on error.  */
60
#define FETCH_DATA(info, nibble) \
61
  ((nibble) < ((instr_data_s *)(info->private_data))->max_fetched \
62
   ? 1 : fetch_data ((info), (nibble)))
63
 
64
static int
65
fetch_data (info, nibble)
66
     struct disassemble_info *info;
67
     int nibble;
68
{
69
  unsigned char mybuf[20];
70
  int status;
71
  instr_data_s *priv = (instr_data_s *)info->private_data;
72
 
73
  if ((nibble % 4) != 0)
74
    abort ();
75
 
76
  status = (*info->read_memory_func) (priv->insn_start,
77
                                      (bfd_byte *) mybuf,
78
                                      nibble / 2,
79
                                      info);
80
  if (status != 0)
81
    {
82
      (*info->memory_error_func) (status, priv->insn_start, info);
83
      longjmp (priv->bailout, 1);
84
    }
85
 
86
  {
87
    int i;
88
    unsigned char *p = mybuf ;
89
 
90
    for (i = 0; i < nibble;)
91
      {
92
        priv->words[i] = (p[0] << 8) | p[1];
93
 
94
        priv->bytes[i] = *p;
95
        priv->nibbles[i++] = *p >> 4;
96
        priv->nibbles[i++] = *p &0xf;
97
 
98
        ++p;
99
        priv->bytes[i] = *p;
100
        priv->nibbles[i++] = *p >> 4;
101
        priv->nibbles[i++] = *p & 0xf;
102
 
103
        ++p;
104
      }
105
  }
106
  priv->max_fetched = nibble;
107
  return 1;
108
}
109
 
110
static char *codes[16] =
111
{
112
  "f",
113
  "lt",
114
  "le",
115
  "ule",
116
  "ov/pe",
117
  "mi",
118
  "eq",
119
  "c/ult",
120
  "t",
121
  "ge",
122
  "gt",
123
  "ugt",
124
  "nov/po",
125
  "pl",
126
  "ne",
127
  "nc/uge"
128
};
129
 
130
int z8k_lookup_instr PARAMS ((unsigned char*, disassemble_info *));
131
static void output_instr
132
  PARAMS ((instr_data_s *, unsigned long, disassemble_info *));
133
static void unpack_instr PARAMS ((instr_data_s *, int, disassemble_info *));
134
static void unparse_instr PARAMS ((instr_data_s *));
135
 
136
static int
137
print_insn_z8k (addr, info, is_segmented)
138
     bfd_vma addr;
139
     disassemble_info *info;
140
     int is_segmented;
141
{
142
  instr_data_s instr_data;
143
 
144
  info->private_data = (PTR) &instr_data;
145
  instr_data.max_fetched = 0;
146
  instr_data.insn_start = addr;
147
  if (setjmp (instr_data.bailout) != 0)
148
    /* Error return.  */
149
    return -1;
150
 
151
  instr_data.tabl_index = z8k_lookup_instr (instr_data.nibbles, info);
152
  if (instr_data.tabl_index > 0)
153
    {
154
      unpack_instr (&instr_data, is_segmented, info);
155
      unparse_instr (&instr_data);
156
      output_instr (&instr_data, addr, info);
157
      return z8k_table[instr_data.tabl_index].length;
158
    }
159
  else
160
    {
161
      FETCH_DATA (info, 4);
162
      (*info->fprintf_func) (info->stream, ".word %02x%02x",
163
                             instr_data.bytes[0], instr_data.bytes[2]);
164
      return 2;
165
    }
166
}
167
 
168
int
169
print_insn_z8001 (addr, info)
170
     bfd_vma addr;
171
     disassemble_info *info;
172
{
173
  return print_insn_z8k (addr, info, 1);
174
}
175
 
176
int
177
print_insn_z8002 (addr, info)
178
     bfd_vma addr;
179
     disassemble_info *info;
180
{
181
  return print_insn_z8k (addr, info, 0);
182
}
183
 
184
int
185
z8k_lookup_instr (nibbles, info)
186
     unsigned char *nibbles;
187
     disassemble_info *info;
188
{
189
 
190
  int nibl_index, tabl_index;
191
  int nibl_matched;
192
  unsigned short instr_nibl;
193
  unsigned short tabl_datum, datum_class, datum_value;
194
 
195
  nibl_matched = 0;
196
  tabl_index = 0;
197
  while (!nibl_matched && z8k_table[tabl_index].name)
198
    {
199
      nibl_matched = 1;
200
      for (nibl_index = 0; nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched; nibl_index++)
201
        {
202
          if ((nibl_index % 4) == 0)
203
            /* Fetch one word at a time.  */
204
            FETCH_DATA (info, nibl_index + 4);
205
          instr_nibl = nibbles[nibl_index];
206
 
207
          tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
208
          datum_class = tabl_datum & CLASS_MASK;
209
          datum_value = ~CLASS_MASK & tabl_datum;
210
 
211
          switch (datum_class)
212
            {
213
            case CLASS_BIT:
214
              if (datum_value != instr_nibl)
215
                nibl_matched = 0;
216
              break;
217
            case CLASS_00II:
218
              if (!((~instr_nibl) & 0x4))
219
                nibl_matched = 0;
220
              break;
221
            case CLASS_01II:
222
              if (!(instr_nibl & 0x4))
223
                nibl_matched = 0;
224
              break;
225
            case CLASS_0CCC:
226
              if (!((~instr_nibl) & 0x8))
227
                nibl_matched = 0;
228
              break;
229
            case CLASS_1CCC:
230
              if (!(instr_nibl & 0x8))
231
                nibl_matched = 0;
232
              break;
233
            case CLASS_0DISP7:
234
              if (!((~instr_nibl) & 0x8))
235
                nibl_matched = 0;
236
              nibl_index += 1;
237
              break;
238
            case CLASS_1DISP7:
239
              if (!(instr_nibl & 0x8))
240
                nibl_matched = 0;
241
              nibl_index += 1;
242
              break;
243
            case CLASS_REGN0:
244
              if (instr_nibl == 0)
245
                nibl_matched = 0;
246
              break;
247
            case CLASS_BIT_1OR2:
248
              if ((instr_nibl | 0x2) != (datum_value | 0x2))
249
                nibl_matched = 0;
250
              break;
251
            default:
252
              break;
253
            }
254
        }
255
      if (nibl_matched)
256
        {
257
          return tabl_index;
258
        }
259
 
260
      tabl_index++;
261
    }
262
  return -1;
263
 
264
}
265
 
266
static void
267
output_instr (instr_data, addr, info)
268
     instr_data_s *instr_data;
269
     unsigned long addr;
270
     disassemble_info *info;
271
{
272
  int loop, loop_limit;
273
  char tmp_str[20];
274
  char out_str[100];
275
 
276
  strcpy (out_str, "\t");
277
 
278
  loop_limit = z8k_table[instr_data->tabl_index].length * 2;
279
  FETCH_DATA (info, loop_limit);
280
  for (loop = 0; loop < loop_limit; loop++)
281
    {
282
      sprintf (tmp_str, "%x", instr_data->nibbles[loop]);
283
      strcat (out_str, tmp_str);
284
    }
285
 
286
  while (loop++ < 8)
287
    {
288
      strcat (out_str, " ");
289
    }
290
 
291
  strcat (out_str, instr_data->instr_asmsrc);
292
 
293
  (*info->fprintf_func) (info->stream, "%s", out_str);
294
}
295
 
296
static void
297
unpack_instr (instr_data, is_segmented, info)
298
     instr_data_s *instr_data;
299
     int is_segmented;
300
     disassemble_info *info;
301
{
302
  int nibl_count, loop;
303
  unsigned short instr_nibl, instr_byte, instr_word;
304
  long instr_long;
305
  unsigned short tabl_datum, datum_class, datum_value;
306
 
307
  nibl_count = 0;
308
  loop = 0;
309
  while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
310
    {
311
      FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
312
      instr_nibl = instr_data->nibbles[nibl_count];
313
      instr_byte = instr_data->bytes[nibl_count];
314
      instr_word = instr_data->words[nibl_count];
315
 
316
      tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
317
      datum_class = tabl_datum & CLASS_MASK;
318
      datum_value = tabl_datum & ~CLASS_MASK;
319
 
320
      switch (datum_class)
321
        {
322
        case CLASS_X:
323
          instr_data->address = instr_nibl;
324
          break;
325
        case CLASS_BA:
326
          instr_data->displacement = instr_nibl;
327
          break;
328
        case CLASS_BX:
329
          instr_data->arg_reg[datum_value] = instr_nibl;
330
          break;
331
        case CLASS_DISP:
332
          switch (datum_value)
333
            {
334
            case ARG_DISP16:
335
              instr_data->displacement = instr_word;
336
              nibl_count += 3;
337
              break;
338
            case ARG_DISP12:
339
              instr_data->displacement = instr_word & 0x0fff;
340
              nibl_count += 2;
341
              break;
342
            default:
343
              break;
344
            }
345
          break;
346
        case CLASS_IMM:
347
          switch (datum_value)
348
            {
349
            case ARG_IMM4:
350
              instr_data->immediate = instr_nibl;
351
              break;
352
            case ARG_NIM8:
353
              instr_data->immediate = (-instr_byte);
354
              nibl_count += 1;
355
              break;
356
            case ARG_IMM8:
357
              instr_data->immediate = instr_byte;
358
              nibl_count += 1;
359
              break;
360
            case ARG_IMM16:
361
              instr_data->immediate = instr_word;
362
              nibl_count += 3;
363
              break;
364
            case ARG_IMM32:
365
              FETCH_DATA (info, nibl_count + 8);
366
              instr_long = (instr_data->words[nibl_count] << 16)
367
                | (instr_data->words[nibl_count + 4]);
368
              instr_data->immediate = instr_long;
369
              nibl_count += 7;
370
              break;
371
            case ARG_IMMN:
372
              instr_data->immediate = instr_nibl - 1;
373
              break;
374
            case ARG_IMM4M1:
375
              instr_data->immediate = instr_nibl + 1;
376
              break;
377
            case ARG_IMM_1:
378
              instr_data->immediate = 1;
379
              break;
380
            case ARG_IMM_2:
381
              instr_data->immediate = 2;
382
              break;
383
            case ARG_IMM2:
384
              instr_data->immediate = instr_nibl & 0x3;
385
              break;
386
            default:
387
              break;
388
            }
389
          break;
390
        case CLASS_CC:
391
          instr_data->cond_code = instr_nibl;
392
          break;
393
        case CLASS_CTRL:
394
          instr_data->ctrl_code = instr_nibl;
395
          break;
396
        case CLASS_DA:
397
        case CLASS_ADDRESS:
398
          if (is_segmented)
399
            {
400
              if (instr_nibl & 0x8)
401
                {
402
                  FETCH_DATA (info, nibl_count + 8);
403
                  instr_long = (instr_data->words[nibl_count] << 16)
404
                    | (instr_data->words[nibl_count + 4]);
405
                  instr_data->address = ((instr_word & 0x7f00) << 8) +
406
                    (instr_long & 0xffff);
407
                  nibl_count += 7;
408
                }
409
              else
410
                {
411
                  instr_data->address = ((instr_word & 0x7f00) << 8) +
412
                    (instr_word & 0x00ff);
413
                  nibl_count += 3;
414
                }
415
            }
416
          else
417
            {
418
              instr_data->address = instr_word;
419
              nibl_count += 3;
420
            }
421
          break;
422
        case CLASS_0CCC:
423
          instr_data->cond_code = instr_nibl & 0x7;
424
          break;
425
        case CLASS_1CCC:
426
          instr_data->cond_code = instr_nibl & 0x7;
427
          break;
428
        case CLASS_0DISP7:
429
          instr_data->displacement = instr_byte & 0x7f;
430
          nibl_count += 1;
431
          break;
432
        case CLASS_1DISP7:
433
          instr_data->displacement = instr_byte & 0x7f;
434
          nibl_count += 1;
435
          break;
436
        case CLASS_01II:
437
          instr_data->interrupts = instr_nibl & 0x3;
438
          break;
439
        case CLASS_00II:
440
          instr_data->interrupts = instr_nibl & 0x3;
441
          break;
442
        case CLASS_BIT:
443
          /* do nothing */
444
          break;
445
        case CLASS_IR:
446
          instr_data->arg_reg[datum_value] = instr_nibl;
447
          break;
448
        case CLASS_FLAGS:
449
          instr_data->flags = instr_nibl;
450
          break;
451
        case CLASS_REG:
452
          instr_data->arg_reg[datum_value] = instr_nibl;
453
          break;
454
        case CLASS_REG_BYTE:
455
          instr_data->arg_reg[datum_value] = instr_nibl;
456
          break;
457
        case CLASS_REG_WORD:
458
          instr_data->arg_reg[datum_value] = instr_nibl;
459
          break;
460
        case CLASS_REG_QUAD:
461
          instr_data->arg_reg[datum_value] = instr_nibl;
462
          break;
463
        case CLASS_REG_LONG:
464
          instr_data->arg_reg[datum_value] = instr_nibl;
465
          break;
466
        case CLASS_REGN0:
467
          instr_data->arg_reg[datum_value] = instr_nibl;
468
          break;
469
        default:
470
          break;
471
        }
472
 
473
      loop += 1;
474
      nibl_count += 1;
475
    }
476
}
477
 
478
static void
479
unparse_instr (instr_data)
480
     instr_data_s *instr_data;
481
{
482
  unsigned short tabl_datum, datum_class, datum_value;
483
  int loop, loop_limit;
484
  char out_str[80], tmp_str[25];
485
 
486
  sprintf (out_str, "\t%s\t", z8k_table[instr_data->tabl_index].name);
487
 
488
  loop_limit = z8k_table[instr_data->tabl_index].noperands;
489
  for (loop = 0; loop < loop_limit; loop++)
490
    {
491
      if (loop)
492
        strcat (out_str, ",");
493
 
494
      tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
495
      datum_class = tabl_datum & CLASS_MASK;
496
      datum_value = tabl_datum & ~CLASS_MASK;
497
 
498
      switch (datum_class)
499
        {
500
        case CLASS_X:
501
          sprintf (tmp_str, "0x%0lx(R%ld)", instr_data->address,
502
                   instr_data->arg_reg[datum_value]);
503
          strcat (out_str, tmp_str);
504
          break;
505
        case CLASS_BA:
506
          sprintf (tmp_str, "r%ld(#%lx)", instr_data->arg_reg[datum_value],
507
                   instr_data->immediate);
508
          strcat (out_str, tmp_str);
509
          break;
510
        case CLASS_BX:
511
          sprintf (tmp_str, "r%ld(R%ld)", instr_data->arg_reg[datum_value],
512
                   instr_data->arg_reg[ARG_RX]);
513
          strcat (out_str, tmp_str);
514
          break;
515
        case CLASS_DISP:
516
          sprintf (tmp_str, "#0x%0lx", instr_data->displacement);
517
          strcat (out_str, tmp_str);
518
          break;
519
        case CLASS_IMM:
520
          sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
521
          strcat (out_str, tmp_str);
522
          break;
523
        case CLASS_CC:
524
          sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
525
          strcat (out_str, tmp_str);
526
          break;
527
        case CLASS_CTRL:
528
          sprintf (tmp_str, "0x%0lx", instr_data->ctrl_code);
529
          strcat (out_str, tmp_str);
530
          break;
531
        case CLASS_DA:
532
        case CLASS_ADDRESS:
533
          sprintf (tmp_str, "#0x%0lx", instr_data->address);
534
          strcat (out_str, tmp_str);
535
          break;
536
        case CLASS_IR:
537
          sprintf (tmp_str, "@R%ld", instr_data->arg_reg[datum_value]);
538
          strcat (out_str, tmp_str);
539
          break;
540
        case CLASS_FLAGS:
541
          sprintf (tmp_str, "0x%0lx", instr_data->flags);
542
          strcat (out_str, tmp_str);
543
          break;
544
        case CLASS_REG_BYTE:
545
          if (instr_data->arg_reg[datum_value] >= 0x8)
546
            {
547
              sprintf (tmp_str, "rl%ld",
548
                       instr_data->arg_reg[datum_value] - 0x8);
549
            }
550
          else
551
            {
552
              sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
553
            }
554
          strcat (out_str, tmp_str);
555
          break;
556
        case CLASS_REG_WORD:
557
          sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
558
          strcat (out_str, tmp_str);
559
          break;
560
        case CLASS_REG_QUAD:
561
          sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
562
          strcat (out_str, tmp_str);
563
          break;
564
        case CLASS_REG_LONG:
565
          sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
566
          strcat (out_str, tmp_str);
567
          break;
568
        default:
569
          break;
570
        }
571
    }
572
 
573
  strcpy (instr_data->instr_asmsrc, out_str);
574
}

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