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[/] [or1k/] [trunk/] [insight/] [opcodes/] [z8k-dis.c] - Blame information for rev 1771

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1 578 markom
/* Disassemble z8000 code.
2
   Copyright 1992, 1993, 1998, 2000
3
   Free Software Foundation, Inc.
4
 
5
This file is part of GNU Binutils.
6
 
7
This program 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 2 of the License, or
10
(at your option) any later version.
11
 
12
This program is distributed in the hope that it will be useful,
13
but WITHOUT ANY WARRANTY; without even the implied warranty of
14
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
GNU General Public 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
20
 
21
#include "sysdep.h"
22
#include "dis-asm.h"
23
 
24
#define DEFINE_TABLE
25
#include "z8k-opc.h"
26
 
27
#include <setjmp.h>
28
 
29
typedef struct
30
{
31
  /* These are all indexed by nibble number (i.e only every other entry
32
     of bytes is used, and every 4th entry of words).  */
33
  unsigned char nibbles[24];
34
  unsigned char bytes[24];
35
  unsigned short words[24];
36
 
37
  /* Nibble number of first word not yet fetched.  */
38
  int max_fetched;
39
  bfd_vma insn_start;
40
  jmp_buf bailout;
41
 
42
  long tabl_index;
43
  char instr_asmsrc[80];
44
  unsigned long arg_reg[0x0f];
45
  unsigned long immediate;
46
  unsigned long displacement;
47
  unsigned long address;
48
  unsigned long cond_code;
49
  unsigned long ctrl_code;
50
  unsigned long flags;
51
  unsigned long interrupts;
52
}
53
instr_data_s;
54
 
55
/* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
56
   to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
57
   on error.  */
58
#define FETCH_DATA(info, nibble) \
59
  ((nibble) < ((instr_data_s *)(info->private_data))->max_fetched \
60
   ? 1 : fetch_data ((info), (nibble)))
61
 
62
static int
63
fetch_data (info, nibble)
64
     struct disassemble_info *info;
65
     int nibble;
66
{
67
  unsigned char mybuf[20];
68
  int status;
69
  instr_data_s *priv = (instr_data_s *) info->private_data;
70
 
71
  if ((nibble % 4) != 0)
72
    abort ();
73
 
74
  status = (*info->read_memory_func) (priv->insn_start,
75
                                      (bfd_byte *) mybuf,
76
                                      nibble / 2,
77
                                      info);
78
  if (status != 0)
79
    {
80
      (*info->memory_error_func) (status, priv->insn_start, info);
81
      longjmp (priv->bailout, 1);
82
    }
83
 
84
  {
85
    int i;
86
    unsigned char *p = mybuf;
87
 
88
    for (i = 0; i < nibble;)
89
      {
90
        priv->words[i] = (p[0] << 8) | p[1];
91
 
92
        priv->bytes[i] = *p;
93
        priv->nibbles[i++] = *p >> 4;
94
        priv->nibbles[i++] = *p & 0xf;
95
 
96
        ++p;
97
        priv->bytes[i] = *p;
98
        priv->nibbles[i++] = *p >> 4;
99
        priv->nibbles[i++] = *p & 0xf;
100
 
101
        ++p;
102
      }
103
  }
104
  priv->max_fetched = nibble;
105
  return 1;
106
}
107
 
108
static char *codes[16] =
109
{
110
  "f",
111
  "lt",
112
  "le",
113
  "ule",
114
  "ov/pe",
115
  "mi",
116
  "eq",
117
  "c/ult",
118
  "t",
119
  "ge",
120
  "gt",
121
  "ugt",
122
  "nov/po",
123
  "pl",
124
  "ne",
125
  "nc/uge"
126
};
127
 
128
static char *ctrl_names[8] =
129
{
130
  "<invld>",
131
  "flags",
132
  "fcw",
133
  "refresh",
134
  "psapseg",
135
  "psapoff",
136
  "nspseg",
137
  "nspoff"
138
};
139
 
140
static int seg_length;
141
int z8k_lookup_instr PARAMS ((unsigned char *, disassemble_info *));
142
static void output_instr
143
  PARAMS ((instr_data_s *, unsigned long, disassemble_info *));
144
static void unpack_instr PARAMS ((instr_data_s *, int, disassemble_info *));
145
static void unparse_instr PARAMS ((instr_data_s *, int));
146
 
147
static int
148
print_insn_z8k (addr, info, is_segmented)
149
     bfd_vma addr;
150
     disassemble_info *info;
151
     int is_segmented;
152
{
153
  instr_data_s instr_data;
154
 
155
  info->private_data = (PTR) &instr_data;
156
  instr_data.max_fetched = 0;
157
  instr_data.insn_start = addr;
158
  if (setjmp (instr_data.bailout) != 0)
159
    /* Error return.  */
160
    return -1;
161
 
162
  instr_data.tabl_index = z8k_lookup_instr (instr_data.nibbles, info);
163
  if (instr_data.tabl_index > 0)
164
    {
165
      unpack_instr (&instr_data, is_segmented, info);
166
      unparse_instr (&instr_data, is_segmented);
167
      output_instr (&instr_data, addr, info);
168
      return z8k_table[instr_data.tabl_index].length + seg_length;
169
    }
170
  else
171
    {
172
      FETCH_DATA (info, 4);
173
      (*info->fprintf_func) (info->stream, ".word %02x%02x",
174
                             instr_data.bytes[0], instr_data.bytes[2]);
175
      return 2;
176
    }
177
}
178
 
179
int
180
print_insn_z8001 (addr, info)
181
     bfd_vma addr;
182
     disassemble_info *info;
183
{
184
  return print_insn_z8k (addr, info, 1);
185
}
186
 
187
int
188
print_insn_z8002 (addr, info)
189
     bfd_vma addr;
190
     disassemble_info *info;
191
{
192
  return print_insn_z8k (addr, info, 0);
193
}
194
 
195
int
196
z8k_lookup_instr (nibbles, info)
197
     unsigned char *nibbles;
198
     disassemble_info *info;
199
{
200
 
201
  int nibl_index, tabl_index;
202
  int nibl_matched;
203
  unsigned short instr_nibl;
204
  unsigned short tabl_datum, datum_class, datum_value;
205
 
206
  nibl_matched = 0;
207
  tabl_index = 0;
208
  while (!nibl_matched && z8k_table[tabl_index].name)
209
    {
210
      nibl_matched = 1;
211
      for (nibl_index = 0;
212
           nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched;
213
           nibl_index++)
214
        {
215
          if ((nibl_index % 4) == 0)
216
            /* Fetch one word at a time.  */
217
            FETCH_DATA (info, nibl_index + 4);
218
          instr_nibl = nibbles[nibl_index];
219
 
220
          tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
221
          datum_class = tabl_datum & CLASS_MASK;
222
          datum_value = ~CLASS_MASK & tabl_datum;
223
 
224
          switch (datum_class)
225
            {
226
            case CLASS_BIT:
227
              if (datum_value != instr_nibl)
228
                nibl_matched = 0;
229
              break;
230
            case CLASS_00II:
231
              if (!((~instr_nibl) & 0x4))
232
                nibl_matched = 0;
233
              break;
234
            case CLASS_01II:
235
              if (!(instr_nibl & 0x4))
236
                nibl_matched = 0;
237
              break;
238
            case CLASS_0CCC:
239
              if (!((~instr_nibl) & 0x8))
240
                nibl_matched = 0;
241
              break;
242
            case CLASS_1CCC:
243
              if (!(instr_nibl & 0x8))
244
                nibl_matched = 0;
245
              break;
246
            case CLASS_0DISP7:
247
              if (!((~instr_nibl) & 0x8))
248
                nibl_matched = 0;
249
              nibl_index += 1;
250
              break;
251
            case CLASS_1DISP7:
252
              if (!(instr_nibl & 0x8))
253
                nibl_matched = 0;
254
              nibl_index += 1;
255
              break;
256
            case CLASS_REGN0:
257
              if (instr_nibl == 0)
258
                nibl_matched = 0;
259
              break;
260
            case CLASS_BIT_1OR2:
261
              if ((instr_nibl | 0x2) != (datum_value | 0x2))
262
                nibl_matched = 0;
263
              break;
264
            default:
265
              break;
266
            }
267
        }
268
      if (nibl_matched)
269
        {
270
          return tabl_index;
271
        }
272
 
273
      tabl_index++;
274
    }
275
  return -1;
276
 
277
}
278
 
279
static void
280
output_instr (instr_data, addr, info)
281
     instr_data_s *instr_data;
282
     unsigned long addr;
283
     disassemble_info *info;
284
{
285
  int loop, loop_limit;
286
  char tmp_str[20];
287
  char out_str[100];
288
 
289
  strcpy (out_str, "\t");
290
 
291
  loop_limit = (z8k_table[instr_data->tabl_index].length + seg_length) * 2;
292
  FETCH_DATA (info, loop_limit);
293
  for (loop = 0; loop < loop_limit; loop++)
294
    {
295
      sprintf (tmp_str, "%x", instr_data->nibbles[loop]);
296
      strcat (out_str, tmp_str);
297
    }
298
 
299
  while (loop++ < 8)
300
    {
301
      strcat (out_str, " ");
302
    }
303
 
304
  strcat (out_str, instr_data->instr_asmsrc);
305
 
306
  (*info->fprintf_func) (info->stream, "%s", out_str);
307
}
308
 
309
static void
310
unpack_instr (instr_data, is_segmented, info)
311
     instr_data_s *instr_data;
312
     int is_segmented;
313
     disassemble_info *info;
314
{
315
  int nibl_count, loop;
316
  unsigned short instr_nibl, instr_byte, instr_word;
317
  long instr_long;
318
  unsigned int tabl_datum, datum_class;
319
  unsigned short datum_value;
320
 
321
  nibl_count = 0;
322
  loop = 0;
323
  seg_length = 0;
324
  while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
325
    {
326
      FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
327
      instr_nibl = instr_data->nibbles[nibl_count];
328
      instr_byte = instr_data->bytes[nibl_count&~1];
329
      instr_word = instr_data->words[nibl_count&~3];
330
 
331
      tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
332
      datum_class = tabl_datum & CLASS_MASK;
333
      datum_value = tabl_datum & ~CLASS_MASK;
334
 
335
      switch (datum_class)
336
        {
337
        case CLASS_DISP:
338
          switch (datum_value)
339
            {
340
            case ARG_DISP16:
341
              instr_data->displacement = instr_data->insn_start + 4 +
342
                (signed short)(instr_word & 0xffff);
343
              nibl_count += 3;
344
              break;
345
            case ARG_DISP12:
346
              if (instr_word & 0x800) {  /* neg. 12 bit displacement */
347
                instr_data->displacement = instr_data->insn_start + 2 -
348
                  (signed short)((instr_word & 0xfff) | 0xf000) * 2;
349
              }
350
              else {
351
                instr_data->displacement = instr_data->insn_start + 2 - (instr_word & 0x0fff) * 2;
352
              }
353
              nibl_count += 2;
354
              break;
355
            default:
356
              break;
357
            }
358
          break;
359
        case CLASS_IMM:
360
          switch (datum_value)
361
            {
362
            case ARG_IMM4:
363
              instr_data->immediate = instr_nibl;
364
              break;
365
            case ARG_NIM8:
366
              instr_data->immediate = (-instr_byte);
367
              nibl_count += 1;
368
              break;
369
            case ARG_IMM8:
370
              instr_data->immediate = instr_byte;
371
              nibl_count += 1;
372
              break;
373
            case ARG_IMM16:
374
              instr_data->immediate = instr_word;
375
              nibl_count += 3;
376
              break;
377
            case ARG_IMM32:
378
              FETCH_DATA (info, nibl_count + 8);
379
              instr_long = (instr_data->words[nibl_count] << 16)
380
                | (instr_data->words[nibl_count + 4]);
381
              instr_data->immediate = instr_long;
382
              nibl_count += 7;
383
              break;
384
            case ARG_IMMN:
385
              instr_data->immediate = instr_nibl - 1;
386
              break;
387
            case ARG_IMM4M1:
388
              instr_data->immediate = instr_nibl + 1;
389
              break;
390
            case ARG_IMM_1:
391
              instr_data->immediate = 1;
392
              break;
393
            case ARG_IMM_2:
394
              instr_data->immediate = 2;
395
              break;
396
            case ARG_IMM2:
397
              instr_data->immediate = instr_nibl & 0x3;
398
              break;
399
            default:
400
              break;
401
            }
402
          break;
403
        case CLASS_CC:
404
          instr_data->cond_code = instr_nibl;
405
          break;
406
        case CLASS_ADDRESS:
407
          if (is_segmented)
408
            {
409
              if (instr_nibl & 0x8)
410
                {
411
                  FETCH_DATA (info, nibl_count + 8);
412
                  instr_long = (instr_data->words[nibl_count] << 16)
413
                    | (instr_data->words[nibl_count + 4]);
414
                  instr_data->address = ((instr_word & 0x7f00) << 8) +
415
                    (instr_long & 0xffff);
416
                  nibl_count += 7;
417
                  seg_length = 2;
418
                }
419
              else
420
                {
421
                  instr_data->address = ((instr_word & 0x7f00) << 8) +
422
                    (instr_word & 0x00ff);
423
                  nibl_count += 3;
424
                }
425
            }
426
          else
427
            {
428
              instr_data->address = instr_word;
429
              nibl_count += 3;
430
            }
431
          break;
432
        case CLASS_0CCC:
433
        case CLASS_1CCC:
434
          instr_data->ctrl_code = instr_nibl & 0x7;
435
          break;
436
        case CLASS_0DISP7:
437
          instr_data->displacement = instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
438
          nibl_count += 1;
439
          break;
440
        case CLASS_1DISP7:
441
          instr_data->displacement = instr_data->insn_start + 2 - (instr_byte & 0x7f) * 2;
442
          nibl_count += 1;
443
          break;
444
        case CLASS_01II:
445
          instr_data->interrupts = instr_nibl & 0x3;
446
          break;
447
        case CLASS_00II:
448
          instr_data->interrupts = instr_nibl & 0x3;
449
          break;
450
        case CLASS_BIT:
451
          instr_data->ctrl_code = instr_nibl & 0x7;
452
          break;
453
        case CLASS_FLAGS:
454
          instr_data->flags = instr_nibl;
455
          break;
456
        case CLASS_REG:
457
          instr_data->arg_reg[datum_value] = instr_nibl;
458
          break;
459
        case CLASS_REGN0:
460
          instr_data->arg_reg[datum_value] = instr_nibl;
461
          break;
462
        case CLASS_DISP8:
463
          instr_data->displacement = instr_data->insn_start + 2  + (signed char)instr_byte * 2;
464
          nibl_count += 1;
465
          break;
466
        default:
467
          abort ();
468
          break;
469
        }
470
 
471
      loop += 1;
472
      nibl_count += 1;
473
    }
474
}
475
 
476
static void
477
unparse_instr (instr_data,is_segmented)
478
     instr_data_s *instr_data;
479
     int is_segmented;
480
{
481
  unsigned short datum_value;
482
  unsigned int tabl_datum, datum_class;
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, "%s", ctrl_names[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
        case CLASS_PR:
569
          if (is_segmented)
570
            sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
571
          else
572
            sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
573
          strcat (out_str, tmp_str);
574
          break;
575
        default:
576
          abort ();
577
          break;
578
        }
579
    }
580
 
581
  strcpy (instr_data->instr_asmsrc, out_str);
582
}

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