OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-stable/] [binutils-2.20.1/] [opcodes/] [m10300-dis.c] - Blame information for rev 843

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 205 julius 
/* Disassemble MN10300 instructions.
2 
   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005, 2007
3 
   Free Software Foundation, Inc.
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 <stdio.h>
23 
 
24 
#include "sysdep.h"
25 
#include "opcode/mn10300.h"
26 
#include "dis-asm.h"
27 
#include "opintl.h"
28 
 
29 
#define HAVE_AM33_2 (info->mach == AM33_2)
30 
#define HAVE_AM33   (info->mach == AM33 || HAVE_AM33_2)
31 
#define HAVE_AM30   (info->mach == AM30)
32 
 
33 
static void
34 
disassemble (bfd_vma memaddr,
35 
             struct disassemble_info *info,
36 
             unsigned long insn,
37 
             unsigned int size)
38 
{
39 
  struct mn10300_opcode *op = (struct mn10300_opcode *) mn10300_opcodes;
40 
  const struct mn10300_operand *operand;
41 
  bfd_byte buffer[4];
42 
  unsigned long extension = 0;
43 
  int status, match = 0;
44 
 
45 
  /* Find the opcode.  */
46 
  while (op->name)
47 
    {
48 
      int mysize, extra_shift;
49 
 
50 
      if (op->format == FMT_S0)
51 
        mysize = 1;
52 
      else if (op->format == FMT_S1
53 
               || op->format == FMT_D0)
54 
        mysize = 2;
55 
      else if (op->format == FMT_S2
56 
               || op->format == FMT_D1)
57 
        mysize = 3;
58 
      else if (op->format == FMT_S4)
59 
        mysize = 5;
60 
      else if (op->format == FMT_D2)
61 
        mysize = 4;
62 
      else if (op->format == FMT_D3)
63 
        mysize = 5;
64 
      else if (op->format == FMT_D4)
65 
        mysize = 6;
66 
      else if (op->format == FMT_D6)
67 
        mysize = 3;
68 
      else if (op->format == FMT_D7 || op->format == FMT_D10)
69 
        mysize = 4;
70 
      else if (op->format == FMT_D8)
71 
        mysize = 6;
72 
      else if (op->format == FMT_D9)
73 
        mysize = 7;
74 
      else
75 
        mysize = 7;
76 
 
77 
      if ((op->mask & insn) == op->opcode
78 
          && size == (unsigned int) mysize
79 
          && (op->machine == 0
80 
              || (op->machine == AM33_2 && HAVE_AM33_2)
81 
              || (op->machine == AM33 && HAVE_AM33)
82 
              || (op->machine == AM30 && HAVE_AM30)))
83 
        {
84 
          const unsigned char *opindex_ptr;
85 
          unsigned int nocomma;
86 
          int paren = 0;
87 
 
88 
          if (op->format == FMT_D1 || op->format == FMT_S1)
89 
            extra_shift = 8;
90 
          else if (op->format == FMT_D2 || op->format == FMT_D4
91 
                   || op->format == FMT_S2 || op->format == FMT_S4
92 
                   || op->format == FMT_S6 || op->format == FMT_D5)
93 
            extra_shift = 16;
94 
          else if (op->format == FMT_D7
95 
                   || op->format == FMT_D8
96 
                   || op->format == FMT_D9)
97 
            extra_shift = 8;
98 
          else
99 
            extra_shift = 0;
100 
 
101 
          if (size == 1 || size == 2)
102 
            extension = 0;
103 
 
104 
          else if (size == 3
105 
                   && (op->format == FMT_D1
106 
                       || op->opcode == 0xdf0000
107 
                       || op->opcode == 0xde0000))
108 
            extension = 0;
109 
 
110 
          else if (size == 3
111 
                   && op->format == FMT_D6)
112 
            extension = 0;
113 
 
114 
          else if (size == 3)
115 
            {
116 
              insn &= 0xff0000;
117 
              status = (*info->read_memory_func) (memaddr + 1, buffer, 2, info);
118 
              if (status != 0)
119 
                {
120 
                  (*info->memory_error_func) (status, memaddr, info);
121 
                  return;
122 
                }
123 
 
124 
              insn |= bfd_getl16 (buffer);
125 
              extension = 0;
126 
            }
127 
          else if (size == 4
128 
                   && (op->opcode == 0xfaf80000
129 
                       || op->opcode == 0xfaf00000
130 
                       || op->opcode == 0xfaf40000))
131 
            extension = 0;
132 
 
133 
          else if (size == 4
134 
                   && (op->format == FMT_D7
135 
                       || op->format == FMT_D10))
136 
            extension = 0;
137 
 
138 
          else if (size == 4)
139 
            {
140 
              insn &= 0xffff0000;
141 
              status = (*info->read_memory_func) (memaddr + 2, buffer, 2, info);
142 
              if (status != 0)
143 
                {
144 
                  (*info->memory_error_func) (status, memaddr, info);
145 
                  return;
146 
                }
147 
 
148 
              insn |= bfd_getl16 (buffer);
149 
              extension = 0;
150 
            }
151 
          else if (size == 5 && op->opcode == 0xdc000000)
152 
            {
153 
              unsigned long temp = 0;
154 
 
155 
              status = (*info->read_memory_func) (memaddr + 1, buffer, 4, info);
156 
              if (status != 0)
157 
                {
158 
                  (*info->memory_error_func) (status, memaddr, info);
159 
                  return;
160 
                }
161 
              temp |= bfd_getl32 (buffer);
162 
 
163 
              insn &= 0xff000000;
164 
              insn |= (temp & 0xffffff00) >> 8;
165 
              extension = temp & 0xff;
166 
            }
167 
          else if (size == 5 && op->format == FMT_D3)
168 
            {
169 
              status = (*info->read_memory_func) (memaddr + 2, buffer, 2, info);
170 
              if (status != 0)
171 
                {
172 
                  (*info->memory_error_func) (status, memaddr, info);
173 
                  return;
174 
                }
175 
              insn &= 0xffff0000;
176 
              insn |= bfd_getl16 (buffer);
177 
 
178 
              status = (*info->read_memory_func) (memaddr + 4, buffer, 1, info);
179 
              if (status != 0)
180 
                {
181 
                  (*info->memory_error_func) (status, memaddr, info);
182 
                  return;
183 
                }
184 
              extension = *(unsigned char *) buffer;
185 
            }
186 
          else if (size == 5)
187 
            {
188 
              unsigned long temp = 0;
189 
 
190 
              status = (*info->read_memory_func) (memaddr + 1, buffer, 2, info);
191 
              if (status != 0)
192 
                {
193 
                  (*info->memory_error_func) (status, memaddr, info);
194 
                  return;
195 
                }
196 
              temp |= bfd_getl16 (buffer);
197 
 
198 
              insn &= 0xff0000ff;
199 
              insn |= temp << 8;
200 
 
201 
              status = (*info->read_memory_func) (memaddr + 4, buffer, 1, info);
202 
              if (status != 0)
203 
                {
204 
                  (*info->memory_error_func) (status, memaddr, info);
205 
                  return;
206 
                }
207 
              extension = *(unsigned char *) buffer;
208 
            }
209 
          else if (size == 6 && op->format == FMT_D8)
210 
            {
211 
              insn &= 0xffffff00;
212 
              status = (*info->read_memory_func) (memaddr + 5, buffer, 1, info);
213 
              if (status != 0)
214 
                {
215 
                  (*info->memory_error_func) (status, memaddr, info);
216 
                  return;
217 
                }
218 
              insn |= *(unsigned char *) buffer;
219 
 
220 
              status = (*info->read_memory_func) (memaddr + 3, buffer, 2, info);
221 
              if (status != 0)
222 
                {
223 
                  (*info->memory_error_func) (status, memaddr, info);
224 
                  return;
225 
                }
226 
              extension = bfd_getl16 (buffer);
227 
            }
228 
          else if (size == 6)
229 
            {
230 
              unsigned long temp = 0;
231 
 
232 
              status = (*info->read_memory_func) (memaddr + 2, buffer, 4, info);
233 
              if (status != 0)
234 
                {
235 
                  (*info->memory_error_func) (status, memaddr, info);
236 
                  return;
237 
                }
238 
              temp |= bfd_getl32 (buffer);
239 
 
240 
              insn &= 0xffff0000;
241 
              insn |= (temp >> 16) & 0xffff;
242 
              extension = temp & 0xffff;
243 
            }
244 
          else if (size == 7 && op->format == FMT_D9)
245 
            {
246 
              insn &= 0xffffff00;
247 
              status = (*info->read_memory_func) (memaddr + 3, buffer, 4, info);
248 
              if (status != 0)
249 
                {
250 
                  (*info->memory_error_func) (status, memaddr, info);
251 
                  return;
252 
                }
253 
              extension = bfd_getl32 (buffer);
254 
              insn |= (extension & 0xff000000) >> 24;
255 
              extension &= 0xffffff;
256 
            }
257 
          else if (size == 7 && op->opcode == 0xdd000000)
258 
            {
259 
              unsigned long temp = 0;
260 
 
261 
              status = (*info->read_memory_func) (memaddr + 1, buffer, 4, info);
262 
              if (status != 0)
263 
                {
264 
                  (*info->memory_error_func) (status, memaddr, info);
265 
                  return;
266 
                }
267 
              temp |= bfd_getl32 (buffer);
268 
 
269 
              insn &= 0xff000000;
270 
              insn |= (temp >> 8) & 0xffffff;
271 
              extension = (temp & 0xff) << 16;
272 
 
273 
              status = (*info->read_memory_func) (memaddr + 5, buffer, 2, info);
274 
              if (status != 0)
275 
                {
276 
                  (*info->memory_error_func) (status, memaddr, info);
277 
                  return;
278 
                }
279 
              extension |= bfd_getb16 (buffer);
280 
            }
281 
          else if (size == 7)
282 
            {
283 
              unsigned long temp = 0;
284 
 
285 
              status = (*info->read_memory_func) (memaddr + 2, buffer, 4, info);
286 
              if (status != 0)
287 
                {
288 
                  (*info->memory_error_func) (status, memaddr, info);
289 
                  return;
290 
                }
291 
              temp |= bfd_getl32 (buffer);
292 
 
293 
              insn &= 0xffff0000;
294 
              insn |= (temp >> 16) & 0xffff;
295 
              extension = (temp & 0xffff) << 8;
296 
 
297 
              status = (*info->read_memory_func) (memaddr + 6, buffer, 1, info);
298 
              if (status != 0)
299 
                {
300 
                  (*info->memory_error_func) (status, memaddr, info);
301 
                  return;
302 
                }
303 
              extension |= *(unsigned char *) buffer;
304 
            }
305 
 
306 
          match = 1;
307 
          (*info->fprintf_func) (info->stream, "%s\t", op->name);
308 
 
309 
          /* Now print the operands.  */
310 
          for (opindex_ptr = op->operands, nocomma = 1;
311 
               *opindex_ptr != 0;
312 
               opindex_ptr++)
313 
            {
314 
              unsigned long value;
315 
 
316 
              operand = &mn10300_operands[*opindex_ptr];
317 
 
318 
              /* If this operand is a PLUS (autoincrement), then do not emit
319 
                 a comma before emitting the plus.  */
320 
              if ((operand->flags & MN10300_OPERAND_PLUS) != 0)
321 
                nocomma = 1;
322 
 
323 
              if ((operand->flags & MN10300_OPERAND_SPLIT) != 0)
324 
                {
325 
                  unsigned long temp;
326 
 
327 
                  value = insn & ((1 << operand->bits) - 1);
328 
                  value <<= (32 - operand->bits);
329 
                  temp = extension >> operand->shift;
330 
                  temp &= ((1 << (32 - operand->bits)) - 1);
331 
                  value |= temp;
332 
                  value = ((value ^ (((unsigned long) 1) << 31))
333 
                           - (((unsigned long) 1) << 31));
334 
                }
335 
              else if ((operand->flags & MN10300_OPERAND_24BIT) != 0)
336 
                {
337 
                  unsigned long temp;
338 
 
339 
                  value = insn & ((1 << operand->bits) - 1);
340 
                  value <<= (24 - operand->bits);
341 
                  temp = extension >> operand->shift;
342 
                  temp &= ((1 << (24 - operand->bits)) - 1);
343 
                  value |= temp;
344 
                  if ((operand->flags & MN10300_OPERAND_SIGNED) != 0)
345 
                    value = ((value & 0xffffff) ^ 0x800000) - 0x800000;
346 
                }
347 
              else if ((operand->flags & (MN10300_OPERAND_FSREG
348 
                                          | MN10300_OPERAND_FDREG)))
349 
                {
350 
                  /* See m10300-opc.c just before #define FSM0 for an
351 
                     explanation of these variables.  Note that
352 
                     FMT-implied shifts are not taken into account for
353 
                     FP registers.  */
354 
                  unsigned long mask_low, mask_high;
355 
                  int shl_low, shr_high, shl_high;
356 
 
357 
                  switch (operand->bits)
358 
                    {
359 
                    case 5:
360 
                      /* Handle regular FP registers.  */
361 
                      if (operand->shift >= 0)
362 
                        {
363 
                          /* This is an `m' register.  */
364 
                          shl_low = operand->shift;
365 
                          shl_high = 8 + (8 & shl_low) + (shl_low & 4) / 4;
366 
                        }
367 
                      else
368 
                        {
369 
                          /* This is an `n' register.  */
370 
                          shl_low = -operand->shift;
371 
                          shl_high = shl_low / 4;
372 
                        }
373 
                      mask_low = 0x0f;
374 
                      mask_high = 0x10;
375 
                      shr_high = 4;
376 
                      break;
377 
 
378 
                    case 3:
379 
                      /* Handle accumulators.  */
380 
                      shl_low = -operand->shift;
381 
                      shl_high = 0;
382 
                      mask_low = 0x03;
383 
                      mask_high = 0x04;
384 
                      shr_high = 2;
385 
                      break;
386 
 
387 
                    default:
388 
                      abort ();
389 
                    }
390 
                  value = ((((insn >> shl_high) << shr_high) & mask_high)
391 
                           | ((insn >> shl_low) & mask_low));
392 
                }
393 
              else if ((operand->flags & MN10300_OPERAND_EXTENDED) != 0)
394 
                value = ((extension >> (operand->shift))
395 
                         & ((1 << operand->bits) - 1));
396 
 
397 
              else
398 
                value = ((insn >> (operand->shift))
399 
                         & ((1 << operand->bits) - 1));
400 
 
401 
              if ((operand->flags & MN10300_OPERAND_SIGNED) != 0
402 
                  /* These are properly extended by the code above.  */
403 
                  && ((operand->flags & MN10300_OPERAND_24BIT) == 0))
404 
                value = ((value ^ (((unsigned long) 1) << (operand->bits - 1)))
405 
                         - (((unsigned long) 1) << (operand->bits - 1)));
406 
 
407 
              if (!nocomma
408 
                  && (!paren
409 
                      || ((operand->flags & MN10300_OPERAND_PAREN) == 0)))
410 
                (*info->fprintf_func) (info->stream, ",");
411 
 
412 
              nocomma = 0;
413 
 
414 
              if ((operand->flags & MN10300_OPERAND_DREG) != 0)
415 
                {
416 
                  value = ((insn >> (operand->shift + extra_shift))
417 
                           & ((1 << operand->bits) - 1));
418 
                  (*info->fprintf_func) (info->stream, "d%d", (int) value);
419 
                }
420 
 
421 
              else if ((operand->flags & MN10300_OPERAND_AREG) != 0)
422 
                {
423 
                  value = ((insn >> (operand->shift + extra_shift))
424 
                           & ((1 << operand->bits) - 1));
425 
                  (*info->fprintf_func) (info->stream, "a%d", (int) value);
426 
                }
427 
 
428 
              else if ((operand->flags & MN10300_OPERAND_SP) != 0)
429 
                (*info->fprintf_func) (info->stream, "sp");
430 
 
431 
              else if ((operand->flags & MN10300_OPERAND_PSW) != 0)
432 
                (*info->fprintf_func) (info->stream, "psw");
433 
 
434 
              else if ((operand->flags & MN10300_OPERAND_MDR) != 0)
435 
                (*info->fprintf_func) (info->stream, "mdr");
436 
 
437 
              else if ((operand->flags & MN10300_OPERAND_RREG) != 0)
438 
                {
439 
                  value = ((insn >> (operand->shift + extra_shift))
440 
                           & ((1 << operand->bits) - 1));
441 
                  if (value < 8)
442 
                    (*info->fprintf_func) (info->stream, "r%d", (int) value);
443 
                  else if (value < 12)
444 
                    (*info->fprintf_func) (info->stream, "a%d", (int) value - 8);
445 
                  else
446 
                    (*info->fprintf_func) (info->stream, "d%d", (int) value - 12);
447 
                }
448 
 
449 
              else if ((operand->flags & MN10300_OPERAND_XRREG) != 0)
450 
                {
451 
                  value = ((insn >> (operand->shift + extra_shift))
452 
                           & ((1 << operand->bits) - 1));
453 
                  if (value == 0)
454 
                    (*info->fprintf_func) (info->stream, "sp");
455 
                  else
456 
                    (*info->fprintf_func) (info->stream, "xr%d", (int) value);
457 
                }
458 
 
459 
              else if ((operand->flags & MN10300_OPERAND_FSREG) != 0)
460 
                (*info->fprintf_func) (info->stream, "fs%d", (int) value);
461 
 
462 
              else if ((operand->flags & MN10300_OPERAND_FDREG) != 0)
463 
                (*info->fprintf_func) (info->stream, "fd%d", (int) value);
464 
 
465 
              else if ((operand->flags & MN10300_OPERAND_FPCR) != 0)
466 
                (*info->fprintf_func) (info->stream, "fpcr");
467 
 
468 
              else if ((operand->flags & MN10300_OPERAND_USP) != 0)
469 
                (*info->fprintf_func) (info->stream, "usp");
470 
 
471 
              else if ((operand->flags & MN10300_OPERAND_SSP) != 0)
472 
                (*info->fprintf_func) (info->stream, "ssp");
473 
 
474 
              else if ((operand->flags & MN10300_OPERAND_MSP) != 0)
475 
                (*info->fprintf_func) (info->stream, "msp");
476 
 
477 
              else if ((operand->flags & MN10300_OPERAND_PC) != 0)
478 
                (*info->fprintf_func) (info->stream, "pc");
479 
 
480 
              else if ((operand->flags & MN10300_OPERAND_EPSW) != 0)
481 
                (*info->fprintf_func) (info->stream, "epsw");
482 
 
483 
              else if ((operand->flags & MN10300_OPERAND_PLUS) != 0)
484 
                (*info->fprintf_func) (info->stream, "+");
485 
 
486 
              else if ((operand->flags & MN10300_OPERAND_PAREN) != 0)
487 
                {
488 
                  if (paren)
489 
                    (*info->fprintf_func) (info->stream, ")");
490 
                  else
491 
                    {
492 
                      (*info->fprintf_func) (info->stream, "(");
493 
                      nocomma = 1;
494 
                    }
495 
                  paren = !paren;
496 
                }
497 
 
498 
              else if ((operand->flags & MN10300_OPERAND_PCREL) != 0)
499 
                (*info->print_address_func) ((long) value + memaddr, info);
500 
 
501 
              else if ((operand->flags & MN10300_OPERAND_MEMADDR) != 0)
502 
                (*info->print_address_func) (value, info);
503 
 
504 
              else if ((operand->flags & MN10300_OPERAND_REG_LIST) != 0)
505 
                {
506 
                  int comma = 0;
507 
 
508 
                  (*info->fprintf_func) (info->stream, "[");
509 
                  if (value & 0x80)
510 
                    {
511 
                      (*info->fprintf_func) (info->stream, "d2");
512 
                      comma = 1;
513 
                    }
514 
 
515 
                  if (value & 0x40)
516 
                    {
517 
                      if (comma)
518 
                        (*info->fprintf_func) (info->stream, ",");
519 
                      (*info->fprintf_func) (info->stream, "d3");
520 
                      comma = 1;
521 
                    }
522 
 
523 
                  if (value & 0x20)
524 
                    {
525 
                      if (comma)
526 
                        (*info->fprintf_func) (info->stream, ",");
527 
                      (*info->fprintf_func) (info->stream, "a2");
528 
                      comma = 1;
529 
                    }
530 
 
531 
                  if (value & 0x10)
532 
                    {
533 
                      if (comma)
534 
                        (*info->fprintf_func) (info->stream, ",");
535 
                      (*info->fprintf_func) (info->stream, "a3");
536 
                      comma = 1;
537 
                    }
538 
 
539 
                  if (value & 0x08)
540 
                    {
541 
                      if (comma)
542 
                        (*info->fprintf_func) (info->stream, ",");
543 
                      (*info->fprintf_func) (info->stream, "other");
544 
                      comma = 1;
545 
                    }
546 
 
547 
                  if (value & 0x04)
548 
                    {
549 
                      if (comma)
550 
                        (*info->fprintf_func) (info->stream, ",");
551 
                      (*info->fprintf_func) (info->stream, "exreg0");
552 
                      comma = 1;
553 
                    }
554 
                  if (value & 0x02)
555 
                    {
556 
                      if (comma)
557 
                        (*info->fprintf_func) (info->stream, ",");
558 
                      (*info->fprintf_func) (info->stream, "exreg1");
559 
                      comma = 1;
560 
                    }
561 
                  if (value & 0x01)
562 
                    {
563 
                      if (comma)
564 
                        (*info->fprintf_func) (info->stream, ",");
565 
                      (*info->fprintf_func) (info->stream, "exother");
566 
                      comma = 1;
567 
                    }
568 
                  (*info->fprintf_func) (info->stream, "]");
569 
                }
570 
 
571 
              else
572 
                (*info->fprintf_func) (info->stream, "%ld", (long) value);
573 
            }
574 
          /* All done. */
575 
          break;
576 
        }
577 
      op++;
578 
    }
579 
 
580 
  if (!match)
581 
    /* xgettext:c-format */
582 
    (*info->fprintf_func) (info->stream, _("unknown\t0x%04lx"), insn);
583 
}
584 
 
585 
int
586 
print_insn_mn10300 (bfd_vma memaddr, struct disassemble_info *info)
587 
{
588 
  int status;
589 
  bfd_byte buffer[4];
590 
  unsigned long insn;
591 
  unsigned int consume;
592 
 
593 
  /* First figure out how big the opcode is.  */
594 
  status = (*info->read_memory_func) (memaddr, buffer, 1, info);
595 
  if (status != 0)
596 
    {
597 
      (*info->memory_error_func) (status, memaddr, info);
598 
      return -1;
599 
    }
600 
  insn = *(unsigned char *) buffer;
601 
 
602 
  /* These are one byte insns.  */
603 
  if ((insn & 0xf3) == 0x00
604 
      || (insn & 0xf0) == 0x10
605 
      || (insn & 0xfc) == 0x3c
606 
      || (insn & 0xf3) == 0x41
607 
      || (insn & 0xf3) == 0x40
608 
      || (insn & 0xfc) == 0x50
609 
      || (insn & 0xfc) == 0x54
610 
      || (insn & 0xf0) == 0x60
611 
      || (insn & 0xf0) == 0x70
612 
      || ((insn & 0xf0) == 0x80
613 
          && (insn & 0x0c) >> 2 != (insn & 0x03))
614 
      || ((insn & 0xf0) == 0x90
615 
          && (insn & 0x0c) >> 2 != (insn & 0x03))
616 
      || ((insn & 0xf0) == 0xa0
617 
          && (insn & 0x0c) >> 2 != (insn & 0x03))
618 
      || ((insn & 0xf0) == 0xb0
619 
          && (insn & 0x0c) >> 2 != (insn & 0x03))
620 
      || (insn & 0xff) == 0xcb
621 
      || (insn & 0xfc) == 0xd0
622 
      || (insn & 0xfc) == 0xd4
623 
      || (insn & 0xfc) == 0xd8
624 
      || (insn & 0xf0) == 0xe0
625 
      || (insn & 0xff) == 0xff)
626 
    {
627 
      consume = 1;
628 
    }
629 
 
630 
  /* These are two byte insns.  */
631 
  else if ((insn & 0xf0) == 0x80
632 
           || (insn & 0xf0) == 0x90
633 
           || (insn & 0xf0) == 0xa0
634 
           || (insn & 0xf0) == 0xb0
635 
           || (insn & 0xfc) == 0x20
636 
           || (insn & 0xfc) == 0x28
637 
           || (insn & 0xf3) == 0x43
638 
           || (insn & 0xf3) == 0x42
639 
           || (insn & 0xfc) == 0x58
640 
           || (insn & 0xfc) == 0x5c
641 
           || ((insn & 0xf0) == 0xc0
642 
               && (insn & 0xff) != 0xcb
643 
               && (insn & 0xff) != 0xcc
644 
               && (insn & 0xff) != 0xcd)
645 
           || (insn & 0xff) == 0xf0
646 
           || (insn & 0xff) == 0xf1
647 
           || (insn & 0xff) == 0xf2
648 
           || (insn & 0xff) == 0xf3
649 
           || (insn & 0xff) == 0xf4
650 
           || (insn & 0xff) == 0xf5
651 
           || (insn & 0xff) == 0xf6)
652 
    {
653 
      status = (*info->read_memory_func) (memaddr, buffer, 2, info);
654 
      if (status != 0)
655 
        {
656 
          (*info->memory_error_func) (status, memaddr, info);
657 
          return -1;
658 
        }
659 
      insn = bfd_getb16 (buffer);
660 
      consume = 2;
661 
    }
662 
 
663 
  /* These are three byte insns.  */
664 
  else if ((insn & 0xff) == 0xf8
665 
           || (insn & 0xff) == 0xcc
666 
           || (insn & 0xff) == 0xf9
667 
           || (insn & 0xf3) == 0x01
668 
           || (insn & 0xf3) == 0x02
669 
           || (insn & 0xf3) == 0x03
670 
           || (insn & 0xfc) == 0x24
671 
           || (insn & 0xfc) == 0x2c
672 
           || (insn & 0xfc) == 0x30
673 
           || (insn & 0xfc) == 0x34
674 
           || (insn & 0xfc) == 0x38
675 
           || (insn & 0xff) == 0xde
676 
           || (insn & 0xff) == 0xdf
677 
           || (insn & 0xff) == 0xf9
678 
           || (insn & 0xff) == 0xcc)
679 
    {
680 
      status = (*info->read_memory_func) (memaddr, buffer, 2, info);
681 
      if (status != 0)
682 
        {
683 
          (*info->memory_error_func) (status, memaddr, info);
684 
          return -1;
685 
        }
686 
      insn = bfd_getb16 (buffer);
687 
      insn <<= 8;
688 
      status = (*info->read_memory_func) (memaddr + 2, buffer, 1, info);
689 
      if (status != 0)
690 
        {
691 
          (*info->memory_error_func) (status, memaddr, info);
692 
          return -1;
693 
        }
694 
      insn |= *(unsigned char *) buffer;
695 
      consume = 3;
696 
    }
697 
 
698 
  /* These are four byte insns.  */
699 
  else if ((insn & 0xff) == 0xfa
700 
           || (insn & 0xff) == 0xf7
701 
           || (insn & 0xff) == 0xfb)
702 
    {
703 
      status = (*info->read_memory_func) (memaddr, buffer, 4, info);
704 
      if (status != 0)
705 
        {
706 
          (*info->memory_error_func) (status, memaddr, info);
707 
          return -1;
708 
        }
709 
      insn = bfd_getb32 (buffer);
710 
      consume = 4;
711 
    }
712 
 
713 
  /* These are five byte insns.  */
714 
  else if ((insn & 0xff) == 0xcd
715 
           || (insn & 0xff) == 0xdc)
716 
    {
717 
      status = (*info->read_memory_func) (memaddr, buffer, 4, info);
718 
      if (status != 0)
719 
        {
720 
          (*info->memory_error_func) (status, memaddr, info);
721 
          return -1;
722 
        }
723 
      insn = bfd_getb32 (buffer);
724 
      consume = 5;
725 
    }
726 
 
727 
  /* These are six byte insns.  */
728 
  else if ((insn & 0xff) == 0xfd
729 
           || (insn & 0xff) == 0xfc)
730 
    {
731 
      status = (*info->read_memory_func) (memaddr, buffer, 4, info);
732 
      if (status != 0)
733 
        {
734 
          (*info->memory_error_func) (status, memaddr, info);
735 
          return -1;
736 
        }
737 
 
738 
      insn = bfd_getb32 (buffer);
739 
      consume = 6;
740 
    }
741 
 
742 
  /* Else its a seven byte insns (in theory).  */
743 
  else
744 
    {
745 
      status = (*info->read_memory_func) (memaddr, buffer, 4, info);
746 
      if (status != 0)
747 
        {
748 
          (*info->memory_error_func) (status, memaddr, info);
749 
          return -1;
750 
        }
751 
 
752 
      insn = bfd_getb32 (buffer);
753 
      consume = 7;
754 
      /* Handle the 5-byte extended instruction codes.  */
755 
      if ((insn & 0xfff80000) == 0xfe800000)
756 
        consume = 5;
757 
    }
758 
 
759 
  disassemble (memaddr, info, insn, consume);
760 
 
761 
  return consume;
762 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.