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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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