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[/] [or1k/] [trunk/] [gdb-5.3/] [opcodes/] [h8300-dis.c] - Blame information for rev 1765

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Line No. Rev Author Line
1 1181 sfurman
/* Disassemble h8300 instructions.
2
   Copyright 1993, 1994, 1996, 1998, 2000, 2001, 2002
3
   Free Software Foundation, Inc.
4
 
5
This program is free software; you can redistribute it and/or modify
6
it under the terms of the GNU General Public License as published by
7
the Free Software Foundation; either version 2 of the License, or
8
(at your option) any later version.
9
 
10
This program is distributed in the hope that it will be useful,
11
but WITHOUT ANY WARRANTY; without even the implied warranty of
12
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13
GNU General Public License for more details.
14
 
15
You should have received a copy of the GNU General Public License
16
along with this program; if not, write to the Free Software
17
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
18
 
19
#define DEFINE_TABLE
20
 
21
#include "sysdep.h"
22
#define h8_opcodes h8ops
23
#include "opcode/h8300.h"
24
#include "dis-asm.h"
25
#include "opintl.h"
26
 
27
static void bfd_h8_disassemble_init PARAMS ((void));
28
static unsigned int bfd_h8_disassemble
29
  PARAMS ((bfd_vma, disassemble_info *, int));
30
 
31
/* Run through the opcodes and sort them into order to make them easy
32
   to disassemble.  */
33
static void
34
bfd_h8_disassemble_init ()
35
{
36
  unsigned int i;
37
  struct h8_opcode *p;
38
 
39
  for (p = h8_opcodes; p->name; p++)
40
    {
41
      int n1 = 0;
42
      int n2 = 0;
43
 
44
      if ((int) p->data.nib[0] < 16)
45
        n1 = (int) p->data.nib[0];
46
      else
47
        n1 = 0;
48
 
49
      if ((int) p->data.nib[1] < 16)
50
        n2 = (int) p->data.nib[1];
51
      else
52
        n2 = 0;
53
 
54
      /* Just make sure there are an even number of nibbles in it, and
55
         that the count is the same as the length.  */
56
      for (i = 0; p->data.nib[i] != E; i++)
57
        ;
58
 
59
      if (i & 1)
60
        abort ();
61
 
62
      p->length = i / 2;
63
    }
64
}
65
 
66
static unsigned int
67
bfd_h8_disassemble (addr, info, mode)
68
     bfd_vma addr;
69
     disassemble_info *info;
70
     int mode;
71
{
72
  /* Find the first entry in the table for this opcode.  */
73
  static const char *regnames[] =
74
    {
75
      "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
76
      "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l"
77
    };
78
  static const char *wregnames[] =
79
    {
80
      "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
81
      "e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7"
82
    };
83
  static const char *lregnames[] =
84
    {
85
      "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7",
86
      "er0", "er1", "er2", "er3", "er4", "er5", "er6", "er7"
87
    };
88
  int rs = 0;
89
  int rd = 0;
90
  int rdisp = 0;
91
  int abs = 0;
92
  int bit = 0;
93
  int plen = 0;
94
  static boolean init = 0;
95
  struct h8_opcode *q;
96
  char const **pregnames = mode != 0 ? lregnames : wregnames;
97
  int status;
98
  int l;
99
  unsigned char data[20];
100
  void *stream = info->stream;
101
  fprintf_ftype fprintf = info->fprintf_func;
102
 
103
  if (!init)
104
    {
105
      bfd_h8_disassemble_init ();
106
      init = 1;
107
    }
108
 
109
  status = info->read_memory_func (addr, data, 2, info);
110
  if (status != 0)
111
    {
112
      info->memory_error_func (status, addr, info);
113
      return -1;
114
    }
115
 
116
  for (l = 2; status == 0 && l < 10; l += 2)
117
    status = info->read_memory_func (addr + l, data + l, 2, info);
118
 
119
  /* Find the exact opcode/arg combo.  */
120
  for (q = h8_opcodes; q->name; q++)
121
    {
122
      op_type *nib = q->data.nib;
123
      unsigned int len = 0;
124
 
125
      while (1)
126
        {
127
          op_type looking_for = *nib;
128
          int thisnib = data[len >> 1];
129
 
130
          thisnib = (len & 1) ? (thisnib & 0xf) : ((thisnib >> 4) & 0xf);
131
 
132
          if (looking_for < 16 && looking_for >= 0)
133
            {
134
              if (looking_for != thisnib)
135
                goto fail;
136
            }
137
          else
138
            {
139
              if ((int) looking_for & (int) B31)
140
                {
141
                  if (!(((int) thisnib & 0x8) != 0))
142
                    goto fail;
143
 
144
                  looking_for = (op_type) ((int) looking_for & ~(int) B31);
145
                }
146
 
147
              if ((int) looking_for & (int) B30)
148
                {
149
                  if (!(((int) thisnib & 0x8) == 0))
150
                    goto fail;
151
 
152
                  looking_for = (op_type) ((int) looking_for & ~(int) B30);
153
                }
154
 
155
              if (looking_for & DBIT)
156
                {
157
                  /* Exclude adds/subs by looking at bit 0 and 2, and
158
                     make sure the operand size, either w or l,
159
                     matches by looking at bit 1.  */
160
                  if ((looking_for & 7) != (thisnib & 7))
161
                    goto fail;
162
 
163
                  abs = (thisnib & 0x8) ? 2 : 1;
164
                }
165
              else if (looking_for & (REG | IND | INC | DEC))
166
                {
167
                  if (looking_for & SRC)
168
                    rs = thisnib;
169
                  else
170
                    rd = thisnib;
171
                }
172
              else if (looking_for & L_16)
173
                {
174
                  abs = (data[len >> 1]) * 256 + data[(len + 2) >> 1];
175
                  plen = 16;
176
                }
177
              else if (looking_for & ABSJMP)
178
                {
179
                  abs = (data[1] << 16) | (data[2] << 8) | (data[3]);
180
                }
181
              else if (looking_for & MEMIND)
182
                {
183
                  abs = data[1];
184
                }
185
              else if (looking_for & L_32)
186
                {
187
                  int i = len >> 1;
188
 
189
                  abs = (data[i] << 24)
190
                    | (data[i + 1] << 16)
191
                    | (data[i + 2] << 8)
192
                    | (data[i + 3]);
193
 
194
                  plen = 32;
195
                }
196
              else if (looking_for & L_24)
197
                {
198
                  int i = len >> 1;
199
 
200
                  abs = (data[i] << 16) | (data[i + 1] << 8) | (data[i + 2]);
201
                  plen = 24;
202
                }
203
              else if (looking_for & IGNORE)
204
                {
205
                  ;
206
                }
207
              else if (looking_for & DISPREG)
208
                {
209
                  rdisp = thisnib;
210
                }
211
              else if (looking_for & KBIT)
212
                {
213
                  switch (thisnib)
214
                    {
215
                    case 9:
216
                      abs = 4;
217
                      break;
218
                    case 8:
219
                      abs = 2;
220
                      break;
221
                    case 0:
222
                      abs = 1;
223
                      break;
224
                    default:
225
                      goto fail;
226
                    }
227
                }
228
              else if (looking_for & L_8)
229
                {
230
                  plen = 8;
231
                  abs = data[len >> 1];
232
                }
233
              else if (looking_for & L_3)
234
                {
235
                  bit = thisnib & 0x7;
236
                }
237
              else if (looking_for & L_2)
238
                {
239
                  plen = 2;
240
                  abs = thisnib & 0x3;
241
                }
242
              else if (looking_for & MACREG)
243
                {
244
                  abs = (thisnib == 3);
245
                }
246
              else if (looking_for == E)
247
                {
248
                  int i;
249
 
250
                  for (i = 0; i < q->length; i++)
251
                    fprintf (stream, "%02x ", data[i]);
252
 
253
                  for (; i < 6; i++)
254
                    fprintf (stream, "   ");
255
 
256
                  fprintf (stream, "%s\t", q->name);
257
 
258
                  /* Gross.  Disgusting.  */
259
                  if (strcmp (q->name, "ldm.l") == 0)
260
                    {
261
                      int count, high;
262
 
263
                      count = (data[1] >> 4) & 0x3;
264
                      high = data[3] & 0x7;
265
 
266
                      fprintf (stream, "@sp+,er%d-er%d", high - count, high);
267
                      return q->length;
268
                    }
269
 
270
                  if (strcmp (q->name, "stm.l") == 0)
271
                    {
272
                      int count, low;
273
 
274
                      count = (data[1] >> 4) & 0x3;
275
                      low = data[3] & 0x7;
276
 
277
                      fprintf (stream, "er%d-er%d,@-sp", low, low + count);
278
                      return q->length;
279
                    }
280
 
281
                  /* Fill in the args.  */
282
                  {
283
                    op_type *args = q->args.nib;
284
                    int hadone = 0;
285
 
286
                    while (*args != E)
287
                      {
288
                        int x = *args;
289
 
290
                        if (hadone)
291
                          fprintf (stream, ",");
292
 
293
                        if (x & L_3)
294
                          {
295
                            fprintf (stream, "#0x%x", (unsigned) bit);
296
                          }
297
                        else if (x & (IMM | KBIT | DBIT))
298
                          {
299
                            /* Bletch.  For shal #2,er0 and friends.  */
300
                            if (*(args + 1) & SRC_IN_DST)
301
                              abs = 2;
302
 
303
                            fprintf (stream, "#0x%x", (unsigned) abs);
304
                          }
305
                        else if (x & REG)
306
                          {
307
                            int rn = (x & DST) ? rd : rs;
308
 
309
                            switch (x & SIZE)
310
                              {
311
                              case L_8:
312
                                fprintf (stream, "%s", regnames[rn]);
313
                                break;
314
                              case L_16:
315
                                fprintf (stream, "%s", wregnames[rn]);
316
                                break;
317
                              case L_P:
318
                              case L_32:
319
                                fprintf (stream, "%s", lregnames[rn]);
320
                                break;
321
                              }
322
                          }
323
                        else if (x & MACREG)
324
                          {
325
                            fprintf (stream, "mac%c", abs ? 'l' : 'h');
326
                          }
327
                        else if (x & INC)
328
                          {
329
                            fprintf (stream, "@%s+", pregnames[rs]);
330
                          }
331
                        else if (x & DEC)
332
                          {
333
                            fprintf (stream, "@-%s", pregnames[rd]);
334
                          }
335
                        else if (x & IND)
336
                          {
337
                            int rn = (x & DST) ? rd : rs;
338
                            fprintf (stream, "@%s", pregnames[rn]);
339
                          }
340
                        else if (x & ABS8MEM)
341
                          {
342
                            fprintf (stream, "@0x%x:8", (unsigned) abs);
343
                          }
344
                        else if (x & (ABS | ABSJMP))
345
                          {
346
                            fprintf (stream, "@0x%x:%d", (unsigned) abs, plen);
347
                          }
348
                        else if (x & MEMIND)
349
                          {
350
                            fprintf (stream, "@@%d (%x)", abs, abs);
351
                          }
352
                        else if (x & PCREL)
353
                          {
354
                            if (x & L_16)
355
                              {
356
                                abs += 2;
357
                                fprintf (stream,
358
                                         ".%s%d (%x)",
359
                                         (short) abs > 0 ? "+" : "",
360
                                         (short) abs, addr + (short) abs + 2);
361
                              }
362
                            else
363
                              {
364
                                fprintf (stream,
365
                                         ".%s%d (%x)",
366
                                         (char) abs > 0 ? "+" : "",
367
                                         (char) abs, addr + (char) abs + 2);
368
                              }
369
                          }
370
                        else if (x & DISP)
371
                          {
372
                            fprintf (stream, "@(0x%x:%d,%s)",
373
                                     abs, plen, pregnames[rdisp]);
374
                          }
375
                        else if (x & CCR)
376
                          {
377
                            fprintf (stream, "ccr");
378
                          }
379
                        else if (x & EXR)
380
                          {
381
                            fprintf (stream, "exr");
382
                          }
383
                        else
384
                          /* xgettext:c-format */
385
                          fprintf (stream, _("Hmmmm %x"), x);
386
 
387
                        hadone = 1;
388
                        args++;
389
                      }
390
                  }
391
 
392
                  return q->length;
393
                }
394
              else
395
                /* xgettext:c-format */
396
                fprintf (stream, _("Don't understand %x \n"), looking_for);
397
            }
398
 
399
          len++;
400
          nib++;
401
        }
402
 
403
    fail:
404
      ;
405
    }
406
 
407
  /* Fell off the end.  */
408
  fprintf (stream, "%02x %02x        .word\tH'%x,H'%x",
409
           data[0], data[1],
410
           data[0], data[1]);
411
  return 2;
412
}
413
 
414
int
415
print_insn_h8300 (addr, info)
416
     bfd_vma addr;
417
     disassemble_info *info;
418
{
419
  return bfd_h8_disassemble (addr, info, 0);
420
}
421
 
422
int
423
print_insn_h8300h (addr, info)
424
     bfd_vma addr;
425
     disassemble_info *info;
426
{
427
  return bfd_h8_disassemble (addr, info, 1);
428
}
429
 
430
int
431
print_insn_h8300s (addr, info)
432
     bfd_vma addr;
433
     disassemble_info *info;
434
{
435
  return bfd_h8_disassemble (addr, info, 2);
436
}

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