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[/] [or1k/] [tags/] [start/] [gdb-5.0/] [opcodes/] [avr-dis.c] - Blame information for rev 1778

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1 106 markom 
/* Disassemble AVR instructions.
2 
   Copyright (C) 1999, 2000 Free Software Foundation, Inc.
3 
 
4 
   Contributed by Denis Chertykov <denisc@overta.ru>
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 
 
21 
#include "dis-asm.h"
22 
#include "opintl.h"
23 
 
24 
typedef unsigned char u8;
25 
typedef unsigned short u16;
26 
typedef unsigned long u32;
27 
 
28 
#define IFMASK(a,b)     ((opcode & (a)) == (b))
29 
 
30 
static char* SREG_flags = "CZNVSHTI";
31 
static char* sect94[] = {"COM","NEG","SWAP","INC","NULL","ASR","LSR","ROR",
32 
                         0,0,"DEC",0,0,0,0,0};
33 
static char* sect98[] = {"CBI","SBIC","SBI","SBIS"};
34 
static char* branchs[] = {
35 
  "BRCS","BREQ","BRMI","BRVS",
36 
  "BRLT","BRHS","BRTS","BRIE",
37 
  "BRCC","BRNE","BRPL","BRVC",
38 
  "BRGE","BRHC","BRTC","BRID"
39 
};
40 
 
41 
static char* last4[] = {"BLD","BST","SBRC","SBRS"};
42 
 
43 
 
44 
static void dispLDD PARAMS ((u16, char *));
45 
 
46 
static void
47 
dispLDD (opcode, dest)
48 
     u16 opcode;
49 
     char *dest;
50 
{
51 
  opcode = (((opcode & 0x2000) >> 8) | ((opcode & 0x0c00) >> 7)
52 
            | (opcode & 7));
53 
  sprintf(dest, "%d", opcode);
54 
}
55 
 
56 
 
57 
static void regPP PARAMS ((u16, char *));
58 
 
59 
static void
60 
regPP (opcode, dest)
61 
     u16 opcode;
62 
     char *dest;
63 
{
64 
  opcode = ((opcode & 0x0600) >> 5) | (opcode & 0xf);
65 
  sprintf(dest, "0x%02X", opcode);
66 
}
67 
 
68 
 
69 
static void reg50 PARAMS ((u16, char *));
70 
 
71 
static void
72 
reg50 (opcode, dest)
73 
     u16 opcode;
74 
     char *dest;
75 
{
76 
  opcode = (opcode & 0x01f0) >> 4;
77 
  sprintf(dest, "R%d", opcode);
78 
}
79 
 
80 
 
81 
static void reg104 PARAMS ((u16, char *));
82 
 
83 
static void
84 
reg104 (opcode, dest)
85 
     u16 opcode;
86 
     char *dest;
87 
{
88 
  opcode = (opcode & 0xf) | ((opcode & 0x0200) >> 5);
89 
  sprintf(dest, "R%d", opcode);
90 
}
91 
 
92 
 
93 
static void reg40 PARAMS ((u16, char *));
94 
 
95 
static void
96 
reg40 (opcode, dest)
97 
     u16 opcode;
98 
     char *dest;
99 
{
100 
  opcode = (opcode & 0xf0) >> 4;
101 
  sprintf(dest, "R%d", opcode + 16);
102 
}
103 
 
104 
 
105 
static void reg20w PARAMS ((u16, char *));
106 
 
107 
static void
108 
reg20w (opcode, dest)
109 
     u16 opcode;
110 
     char *dest;
111 
{
112 
  opcode = (opcode & 0x30) >> 4;
113 
  sprintf(dest, "R%d", 24 + opcode * 2);
114 
}
115 
 
116 
 
117 
static void lit404 PARAMS ((u16, char *));
118 
 
119 
static void
120 
lit404 (opcode, dest)
121 
     u16 opcode;
122 
     char *dest;
123 
{
124 
  opcode = ((opcode & 0xf00) >> 4) | (opcode & 0xf);
125 
  sprintf(dest, "0x%02X", opcode);
126 
}
127 
 
128 
 
129 
static void lit204 PARAMS ((u16, char *));
130 
 
131 
static void
132 
lit204 (opcode, dest)
133 
     u16 opcode;
134 
     char *dest;
135 
{
136 
  opcode = ((opcode & 0xc0) >> 2) | (opcode & 0xf);
137 
  sprintf(dest, "0x%02X", opcode);
138 
}
139 
 
140 
 
141 
static void add0fff PARAMS ((u16, char *, int));
142 
 
143 
static void
144 
add0fff (op, dest, pc)
145 
     u16 op;
146 
     char *dest;
147 
     int pc;
148 
{
149 
  int rel_addr = (((op & 0xfff) ^ 0x800) - 0x800) * 2;
150 
  sprintf(dest, ".%+-8d ; 0x%06X", rel_addr, pc + 2 + rel_addr);
151 
}
152 
 
153 
 
154 
static void add03f8 PARAMS ((u16, char *, int));
155 
 
156 
static void
157 
add03f8 (op, dest, pc)
158 
     u16 op;
159 
     char *dest;
160 
     int pc;
161 
{
162 
  int rel_addr = ((((op >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;
163 
  sprintf(dest, ".%+-8d ; 0x%06X", rel_addr, pc + 2 + rel_addr);
164 
}
165 
 
166 
 
167 
static u16 avrdis_opcode PARAMS ((bfd_vma, disassemble_info *));
168 
 
169 
static u16
170 
avrdis_opcode (addr, info)
171 
     bfd_vma addr;
172 
     disassemble_info *info;
173 
{
174 
  bfd_byte buffer[2];
175 
  int status;
176 
  status = info->read_memory_func(addr, buffer, 2, info);
177 
  if (status != 0)
178 
    {
179 
      info->memory_error_func(status, addr, info);
180 
      return -1;
181 
    }
182 
  return bfd_getl16 (buffer);
183 
}
184 
 
185 
 
186 
int
187 
print_insn_avr(addr, info)
188 
     bfd_vma addr;
189 
     disassemble_info *info;
190 
{
191 
  char rr[200];
192 
  char rd[200];
193 
  u16 opcode;
194 
  void *stream = info->stream;
195 
  fprintf_ftype prin = info->fprintf_func;
196 
  int cmd_len = 2;
197 
 
198 
  opcode = avrdis_opcode (addr, info);
199 
 
200 
  if (IFMASK(0xd000, 0x8000))
201 
    {
202 
      char letter;
203 
      reg50(opcode, rd);
204 
      dispLDD(opcode, rr);
205 
      if (opcode & 8)
206 
        letter = 'Y';
207 
      else
208 
        letter = 'Z';
209 
      if (opcode & 0x0200)
210 
        (*prin) (stream, "    STD     %c+%s,%s", letter, rr, rd);
211 
      else
212 
        (*prin) (stream, "    LDD     %s,%c+%s", rd, letter, rr);
213 
    }
214 
  else
215 
    {
216 
      switch (opcode & 0xf000)
217 
        {
218 
        case 0x0000:
219 
          {
220 
            reg50(opcode, rd);
221 
            reg104(opcode, rr);
222 
            switch (opcode & 0x0c00)
223 
              {
224 
              case 0x0000:
225 
                (*prin) (stream, "    NOP");
226 
                break;
227 
              case 0x0400:
228 
                (*prin) (stream, "    CPC     %s,%s", rd, rr);
229 
                break;
230 
              case 0x0800:
231 
                (*prin) (stream, "    SBC     %s,%s", rd, rr);
232 
                break;
233 
              case 0x0c00:
234 
                (*prin) (stream, "    ADD     %s,%s", rd, rr);
235 
                break;
236 
              }
237 
          }
238 
          break;
239 
        case 0x1000:
240 
          {
241 
            reg50(opcode, rd);
242 
            reg104(opcode, rr);
243 
            switch (opcode & 0x0c00)
244 
              {
245 
              case 0x0000:
246 
                (*prin) (stream, "    CPSE    %s,%s", rd, rr);
247 
                break;
248 
              case 0x0400:
249 
                (*prin) (stream, "    CP      %s,%s", rd, rr);
250 
                break;
251 
              case 0x0800:
252 
                (*prin) (stream, "    SUB     %s,%s", rd, rr);
253 
                break;
254 
              case 0x0c00:
255 
                (*prin) (stream, "    ADC     %s,%s", rd, rr);
256 
                break;
257 
              }
258 
          }
259 
          break;
260 
        case 0x2000:
261 
          {
262 
            reg50(opcode, rd);
263 
            reg104(opcode, rr);
264 
            switch (opcode & 0x0c00)
265 
              {
266 
              case 0x0000:
267 
                (*prin) (stream, "    AND     %s,%s", rd, rr);
268 
                break;
269 
              case 0x0400:
270 
                (*prin) (stream, "    EOR     %s,%s", rd, rr);
271 
                break;
272 
              case 0x0800:
273 
                (*prin) (stream, "    OR      %s,%s", rd, rr);
274 
                break;
275 
              case 0x0c00:
276 
                (*prin) (stream, "    MOV     %s,%s", rd, rr);
277 
                break;
278 
              }
279 
          }
280 
          break;
281 
        case 0x3000:
282 
          {
283 
            reg40(opcode, rd);
284 
            lit404(opcode, rr);
285 
            (*prin) (stream, "    CPI     %s,%s", rd, rr);
286 
          }
287 
          break;
288 
        case 0x4000:
289 
          {
290 
            reg40(opcode, rd);
291 
            lit404(opcode, rr);
292 
            (*prin) (stream, "    SBCI    %s,%s", rd, rr);
293 
          }
294 
          break;
295 
        case 0x5000:
296 
          {
297 
            reg40(opcode, rd);
298 
            lit404(opcode, rr);
299 
            (*prin) (stream, "    SUBI    %s,%s", rd, rr);
300 
          }
301 
          break;
302 
        case 0x6000:
303 
          {
304 
            reg40(opcode, rd);
305 
            lit404(opcode, rr);
306 
            (*prin) (stream, "    ORI     %s,%s", rd, rr);
307 
          }
308 
          break;
309 
        case 0x7000:
310 
          {
311 
            reg40(opcode, rd);
312 
            lit404(opcode, rr);
313 
            (*prin) (stream, "    ANDI    %s,%s", rd, rr);
314 
          }
315 
          break;
316 
        case 0x9000:
317 
          {
318 
            switch (opcode & 0x0e00)
319 
              {
320 
              case 0x0000:
321 
                {
322 
                  reg50(opcode, rd);
323 
                  switch (opcode & 0xf)
324 
                    {
325 
                    case 0x0:
326 
                      {
327 
                        (*prin) (stream, "    LDS     %s,0x%04X", rd,
328 
                                 avrdis_opcode(addr + 2, info));
329 
                        cmd_len = 4;
330 
                      }
331 
                      break;
332 
                    case 0x1:
333 
                      (*prin) (stream, "    LD      %s,Z+", rd);
334 
                      break;
335 
                    case 0x2:
336 
                      (*prin) (stream, "    LD      %s,-Z", rd);
337 
                      break;
338 
                    case 0x9:
339 
                      (*prin) (stream, "    LD      %s,Y+", rd);
340 
                      break;
341 
                    case 0xa:
342 
                      (*prin) (stream, "    LD      %s,-Y", rd);
343 
                      break;
344 
                    case 0xc:
345 
                      (*prin) (stream, "    LD      %s,X", rd);
346 
                      break;
347 
                    case 0xd:
348 
                      (*prin) (stream, "    LD      %s,X+", rd);
349 
                      break;
350 
                    case 0xe:
351 
                      (*prin) (stream, "    LD      %s,-X", rd);
352 
                      break;
353 
                    case 0xf:
354 
                      (*prin) (stream, "    POP     %s", rd);
355 
                      break;
356 
                    default:
357 
                      (*prin) (stream, "    ????");
358 
                      break;
359 
                    }
360 
                }
361 
                break;
362 
              case 0x0200:
363 
                {
364 
                  reg50(opcode, rd);
365 
                  switch (opcode & 0xf)
366 
                    {
367 
                    case 0x0:
368 
                      {
369 
                        (*prin) (stream, "    STS     0x%04X,%s",
370 
                                 avrdis_opcode(addr + 2, info), rd);
371 
                        cmd_len = 4;
372 
                      }
373 
                      break;
374 
                    case 0x1:
375 
                      (*prin) (stream, "    ST      Z+,%s", rd);
376 
                      break;
377 
                    case 0x2:
378 
                      (*prin) (stream, "    ST      -Z,%s", rd);
379 
                      break;
380 
                    case 0x9:
381 
                      (*prin) (stream, "    ST      Y+,%s", rd);
382 
                      break;
383 
                    case 0xa:
384 
                      (*prin) (stream, "    ST      -Y,%s", rd);
385 
                      break;
386 
                    case 0xc:
387 
                      (*prin) (stream, "    ST      X,%s", rd);
388 
                      break;
389 
                    case 0xd:
390 
                      (*prin) (stream, "    ST      X+,%s", rd);
391 
                      break;
392 
                    case 0xe:
393 
                      (*prin) (stream, "    ST      -X,%s", rd);
394 
                      break;
395 
                    case 0xf:
396 
                      (*prin) (stream, "    PUSH    %s", rd);
397 
                      break;
398 
                    default:
399 
                      (*prin) (stream, "    ????");
400 
                      break;
401 
                    }
402 
                }
403 
                break;
404 
              case 0x0400:
405 
                {
406 
                  if (IFMASK(0x020c, 0x000c))
407 
                    {
408 
                      u32 k = ((opcode & 0x01f0) >> 3) | (opcode & 1);
409 
                      k = (k << 16) | avrdis_opcode(addr + 2, info);
410 
                      if (opcode & 0x0002)
411 
                        (*prin) (stream, "    CALL    0x%06X", k*2);
412 
                      else
413 
                        (*prin) (stream, "    JMP     0x%06X", k*2);
414 
                      cmd_len = 4;
415 
                    }
416 
                  else if (IFMASK(0x010f, 0x0008))
417 
                    {
418 
                      int sf = (opcode & 0x70) >> 4;
419 
                      if (opcode & 0x0080)
420 
                        (*prin) (stream, "    CL%c", SREG_flags[sf]);
421 
                      else
422 
                        (*prin) (stream, "    SE%c", SREG_flags[sf]);
423 
                    }
424 
                  else if (IFMASK(0x000f, 0x0009))
425 
                    {
426 
                      if (opcode & 0x0100)
427 
                        (*prin) (stream, "    ICALL");
428 
                      else
429 
                        (*prin) (stream, "    IJMP");
430 
                    }
431 
                  else if (IFMASK(0x010f, 0x0108))
432 
                    {
433 
                      if (IFMASK(0x0090, 0x0000))
434 
                        (*prin) (stream, "    RET");
435 
                      else if (IFMASK(0x0090, 0x0010))
436 
                        (*prin) (stream, "    RETI");
437 
                      else if (IFMASK(0x00e0, 0x0080))
438 
                        (*prin) (stream, "    SLEEP");
439 
                      else if (IFMASK(0x00e0, 0x00a0))
440 
                        (*prin) (stream, "    WDR");
441 
                      else if (IFMASK(0x00f0, 0x00c0))
442 
                        (*prin) (stream, "    LPM");
443 
                      else if (IFMASK(0x00f0, 0x00d0))
444 
                        (*prin) (stream, "    ELPM");
445 
                      else
446 
                        (*prin) (stream, "    ????");
447 
                    }
448 
                  else
449 
                    {
450 
                      const char* p;
451 
                      reg50(opcode, rd);
452 
                      p = sect94[opcode & 0xf];
453 
                      if (!p)
454 
                        p = "????";
455 
                      (*prin) (stream, "    %-8s%s", p, rd);
456 
                    }
457 
                }
458 
                break;
459 
              case 0x0600:
460 
                {
461 
                  if (opcode & 0x0200)
462 
                    {
463 
                      lit204(opcode, rd);
464 
                      reg20w(opcode, rr);
465 
                      if (opcode & 0x0100)
466 
                        (*prin) (stream, "    SBIW    %s,%s", rr, rd);
467 
                      else
468 
                        (*prin) (stream, "    ADIW    %s,%s", rr, rd);
469 
                    }
470 
                }
471 
                break;
472 
              case 0x0800:
473 
              case 0x0a00:
474 
                {
475 
                  (*prin) (stream, "    %-8s0x%02X,%d",
476 
                           sect98[(opcode & 0x0300) >> 8],
477 
                           (opcode & 0xf8) >> 3,
478 
                           opcode & 7);
479 
                }
480 
                break;
481 
              default:
482 
                {
483 
                  reg50(opcode, rd);
484 
                  reg104(opcode, rr);
485 
                  (*prin) (stream, "    MUL     %s,%s", rd, rr);
486 
                }
487 
              }
488 
          }
489 
          break;
490 
        case 0xb000:
491 
          {
492 
            reg50(opcode, rd);
493 
            regPP(opcode, rr);
494 
            if (opcode & 0x0800)
495 
              (*prin) (stream, "    OUT     %s,%s", rr, rd);
496 
            else
497 
              (*prin) (stream, "    IN      %s,%s", rd, rr);
498 
          }
499 
          break;
500 
        case 0xc000:
501 
          {
502 
            add0fff(opcode, rd, addr);
503 
            (*prin) (stream, "    RJMP    %s", rd);
504 
          }
505 
          break;
506 
        case 0xd000:
507 
          {
508 
            add0fff(opcode, rd, addr);
509 
            (*prin) (stream, "    RCALL   %s", rd);
510 
          }
511 
          break;
512 
        case 0xe000:
513 
          {
514 
            reg40(opcode, rd);
515 
            lit404(opcode, rr);
516 
            (*prin) (stream, "    LDI     %s,%s", rd, rr);
517 
          }
518 
          break;
519 
        case 0xf000:
520 
          {
521 
            if (opcode & 0x0800)
522 
              {
523 
                reg50(opcode, rd);
524 
                (*prin) (stream, "    %-8s%s,%d",
525 
                         last4[(opcode & 0x0600) >> 9],
526 
                         rd, opcode & 7);
527 
              }
528 
            else
529 
              {
530 
                char* p;
531 
                add03f8(opcode, rd, addr);
532 
                p = branchs[((opcode & 0x0400) >> 7) | (opcode & 7)];
533 
                (*prin) (stream, "    %-8s%s", p, rd);
534 
              }
535 
          }
536 
          break;
537 
        }
538 
    }
539 
  return cmd_len;
540 
}

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