source: trunk/src/binutils/opcodes/z8k-dis.c@ 108

Last change on this file since 108 was 10, checked in by bird, 23 years ago

Initial revision
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Line 
1/* Disassemble z8000 code.
2 Copyright 1992, 1993, 1998, 2000
3 Free Software Foundation, Inc.
4
5This file is part of GNU Binutils.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, 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
28#include <setjmp.h>
29
30
31typedef 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}
55instr_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
64static int
65fetch_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
110static 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
130int z8k_lookup_instr PARAMS ((unsigned char *, disassemble_info *));
131static void output_instr
132 PARAMS ((instr_data_s *, unsigned long, disassemble_info *));
133static void unpack_instr PARAMS ((instr_data_s *, int, disassemble_info *));
134static void unparse_instr PARAMS ((instr_data_s *));
135
136static int
137print_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
168int
169print_insn_z8001 (addr, info)
170 bfd_vma addr;
171 disassemble_info *info;
172{
173 return print_insn_z8k (addr, info, 1);
174}
175
176int
177print_insn_z8002 (addr, info)
178 bfd_vma addr;
179 disassemble_info *info;
180{
181 return print_insn_z8k (addr, info, 0);
182}
183
184int
185z8k_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;
201 nibl_index < z8k_table[tabl_index].length * 2 && nibl_matched;
202 nibl_index++)
203 {
204 if ((nibl_index % 4) == 0)
205 /* Fetch one word at a time. */
206 FETCH_DATA (info, nibl_index + 4);
207 instr_nibl = nibbles[nibl_index];
208
209 tabl_datum = z8k_table[tabl_index].byte_info[nibl_index];
210 datum_class = tabl_datum & CLASS_MASK;
211 datum_value = ~CLASS_MASK & tabl_datum;
212
213 switch (datum_class)
214 {
215 case CLASS_BIT:
216 if (datum_value != instr_nibl)
217 nibl_matched = 0;
218 break;
219 case CLASS_00II:
220 if (!((~instr_nibl) & 0x4))
221 nibl_matched = 0;
222 break;
223 case CLASS_01II:
224 if (!(instr_nibl & 0x4))
225 nibl_matched = 0;
226 break;
227 case CLASS_0CCC:
228 if (!((~instr_nibl) & 0x8))
229 nibl_matched = 0;
230 break;
231 case CLASS_1CCC:
232 if (!(instr_nibl & 0x8))
233 nibl_matched = 0;
234 break;
235 case CLASS_0DISP7:
236 if (!((~instr_nibl) & 0x8))
237 nibl_matched = 0;
238 nibl_index += 1;
239 break;
240 case CLASS_1DISP7:
241 if (!(instr_nibl & 0x8))
242 nibl_matched = 0;
243 nibl_index += 1;
244 break;
245 case CLASS_REGN0:
246 if (instr_nibl == 0)
247 nibl_matched = 0;
248 break;
249 case CLASS_BIT_1OR2:
250 if ((instr_nibl | 0x2) != (datum_value | 0x2))
251 nibl_matched = 0;
252 break;
253 default:
254 break;
255 }
256 }
257 if (nibl_matched)
258 {
259 return tabl_index;
260 }
261
262 tabl_index++;
263 }
264 return -1;
265
266}
267
268static void
269output_instr (instr_data, addr, info)
270 instr_data_s *instr_data;
271 unsigned long addr;
272 disassemble_info *info;
273{
274 int loop, loop_limit;
275 char tmp_str[20];
276 char out_str[100];
277
278 strcpy (out_str, "\t");
279
280 loop_limit = z8k_table[instr_data->tabl_index].length * 2;
281 FETCH_DATA (info, loop_limit);
282 for (loop = 0; loop < loop_limit; loop++)
283 {
284 sprintf (tmp_str, "%x", instr_data->nibbles[loop]);
285 strcat (out_str, tmp_str);
286 }
287
288 while (loop++ < 8)
289 {
290 strcat (out_str, " ");
291 }
292
293 strcat (out_str, instr_data->instr_asmsrc);
294
295 (*info->fprintf_func) (info->stream, "%s", out_str);
296}
297
298static void
299unpack_instr (instr_data, is_segmented, info)
300 instr_data_s *instr_data;
301 int is_segmented;
302 disassemble_info *info;
303{
304 int nibl_count, loop;
305 unsigned short instr_nibl, instr_byte, instr_word;
306 long instr_long;
307 unsigned short tabl_datum, datum_class, datum_value;
308
309 nibl_count = 0;
310 loop = 0;
311 while (z8k_table[instr_data->tabl_index].byte_info[loop] != 0)
312 {
313 FETCH_DATA (info, nibl_count + 4 - (nibl_count % 4));
314 instr_nibl = instr_data->nibbles[nibl_count];
315 instr_byte = instr_data->bytes[nibl_count];
316 instr_word = instr_data->words[nibl_count];
317
318 tabl_datum = z8k_table[instr_data->tabl_index].byte_info[loop];
319 datum_class = tabl_datum & CLASS_MASK;
320 datum_value = tabl_datum & ~CLASS_MASK;
321
322 switch (datum_class)
323 {
324 case CLASS_X:
325 instr_data->address = instr_nibl;
326 break;
327 case CLASS_BA:
328 instr_data->displacement = instr_nibl;
329 break;
330 case CLASS_BX:
331 instr_data->arg_reg[datum_value] = instr_nibl;
332 break;
333 case CLASS_DISP:
334 switch (datum_value)
335 {
336 case ARG_DISP16:
337 instr_data->displacement = instr_word;
338 nibl_count += 3;
339 break;
340 case ARG_DISP12:
341 instr_data->displacement = instr_word & 0x0fff;
342 nibl_count += 2;
343 break;
344 default:
345 break;
346 }
347 break;
348 case CLASS_IMM:
349 switch (datum_value)
350 {
351 case ARG_IMM4:
352 instr_data->immediate = instr_nibl;
353 break;
354 case ARG_NIM8:
355 instr_data->immediate = (-instr_byte);
356 nibl_count += 1;
357 break;
358 case ARG_IMM8:
359 instr_data->immediate = instr_byte;
360 nibl_count += 1;
361 break;
362 case ARG_IMM16:
363 instr_data->immediate = instr_word;
364 nibl_count += 3;
365 break;
366 case ARG_IMM32:
367 FETCH_DATA (info, nibl_count + 8);
368 instr_long = (instr_data->words[nibl_count] << 16)
369 | (instr_data->words[nibl_count + 4]);
370 instr_data->immediate = instr_long;
371 nibl_count += 7;
372 break;
373 case ARG_IMMN:
374 instr_data->immediate = instr_nibl - 1;
375 break;
376 case ARG_IMM4M1:
377 instr_data->immediate = instr_nibl + 1;
378 break;
379 case ARG_IMM_1:
380 instr_data->immediate = 1;
381 break;
382 case ARG_IMM_2:
383 instr_data->immediate = 2;
384 break;
385 case ARG_IMM2:
386 instr_data->immediate = instr_nibl & 0x3;
387 break;
388 default:
389 break;
390 }
391 break;
392 case CLASS_CC:
393 instr_data->cond_code = instr_nibl;
394 break;
395 case CLASS_CTRL:
396 instr_data->ctrl_code = instr_nibl;
397 break;
398 case CLASS_DA:
399 case CLASS_ADDRESS:
400 if (is_segmented)
401 {
402 if (instr_nibl & 0x8)
403 {
404 FETCH_DATA (info, nibl_count + 8);
405 instr_long = (instr_data->words[nibl_count] << 16)
406 | (instr_data->words[nibl_count + 4]);
407 instr_data->address = ((instr_word & 0x7f00) << 8) +
408 (instr_long & 0xffff);
409 nibl_count += 7;
410 }
411 else
412 {
413 instr_data->address = ((instr_word & 0x7f00) << 8) +
414 (instr_word & 0x00ff);
415 nibl_count += 3;
416 }
417 }
418 else
419 {
420 instr_data->address = instr_word;
421 nibl_count += 3;
422 }
423 break;
424 case CLASS_0CCC:
425 instr_data->cond_code = instr_nibl & 0x7;
426 break;
427 case CLASS_1CCC:
428 instr_data->cond_code = instr_nibl & 0x7;
429 break;
430 case CLASS_0DISP7:
431 instr_data->displacement = instr_byte & 0x7f;
432 nibl_count += 1;
433 break;
434 case CLASS_1DISP7:
435 instr_data->displacement = instr_byte & 0x7f;
436 nibl_count += 1;
437 break;
438 case CLASS_01II:
439 instr_data->interrupts = instr_nibl & 0x3;
440 break;
441 case CLASS_00II:
442 instr_data->interrupts = instr_nibl & 0x3;
443 break;
444 case CLASS_BIT:
445 /* Do nothing. */
446 break;
447 case CLASS_IR:
448 instr_data->arg_reg[datum_value] = instr_nibl;
449 break;
450 case CLASS_FLAGS:
451 instr_data->flags = instr_nibl;
452 break;
453 case CLASS_REG:
454 instr_data->arg_reg[datum_value] = instr_nibl;
455 break;
456 case CLASS_REG_BYTE:
457 instr_data->arg_reg[datum_value] = instr_nibl;
458 break;
459 case CLASS_REG_WORD:
460 instr_data->arg_reg[datum_value] = instr_nibl;
461 break;
462 case CLASS_REG_QUAD:
463 instr_data->arg_reg[datum_value] = instr_nibl;
464 break;
465 case CLASS_REG_LONG:
466 instr_data->arg_reg[datum_value] = instr_nibl;
467 break;
468 case CLASS_REGN0:
469 instr_data->arg_reg[datum_value] = instr_nibl;
470 break;
471 default:
472 break;
473 }
474
475 loop += 1;
476 nibl_count += 1;
477 }
478}
479
480static void
481unparse_instr (instr_data)
482 instr_data_s *instr_data;
483{
484 unsigned short tabl_datum, datum_class, datum_value;
485 int loop, loop_limit;
486 char out_str[80], tmp_str[25];
487
488 sprintf (out_str, "\t%s\t", z8k_table[instr_data->tabl_index].name);
489
490 loop_limit = z8k_table[instr_data->tabl_index].noperands;
491 for (loop = 0; loop < loop_limit; loop++)
492 {
493 if (loop)
494 strcat (out_str, ",");
495
496 tabl_datum = z8k_table[instr_data->tabl_index].arg_info[loop];
497 datum_class = tabl_datum & CLASS_MASK;
498 datum_value = tabl_datum & ~CLASS_MASK;
499
500 switch (datum_class)
501 {
502 case CLASS_X:
503 sprintf (tmp_str, "0x%0lx(R%ld)", instr_data->address,
504 instr_data->arg_reg[datum_value]);
505 strcat (out_str, tmp_str);
506 break;
507 case CLASS_BA:
508 sprintf (tmp_str, "r%ld(#%lx)", instr_data->arg_reg[datum_value],
509 instr_data->immediate);
510 strcat (out_str, tmp_str);
511 break;
512 case CLASS_BX:
513 sprintf (tmp_str, "r%ld(R%ld)", instr_data->arg_reg[datum_value],
514 instr_data->arg_reg[ARG_RX]);
515 strcat (out_str, tmp_str);
516 break;
517 case CLASS_DISP:
518 sprintf (tmp_str, "#0x%0lx", instr_data->displacement);
519 strcat (out_str, tmp_str);
520 break;
521 case CLASS_IMM:
522 sprintf (tmp_str, "#0x%0lx", instr_data->immediate);
523 strcat (out_str, tmp_str);
524 break;
525 case CLASS_CC:
526 sprintf (tmp_str, "%s", codes[instr_data->cond_code]);
527 strcat (out_str, tmp_str);
528 break;
529 case CLASS_CTRL:
530 sprintf (tmp_str, "0x%0lx", instr_data->ctrl_code);
531 strcat (out_str, tmp_str);
532 break;
533 case CLASS_DA:
534 case CLASS_ADDRESS:
535 sprintf (tmp_str, "#0x%0lx", instr_data->address);
536 strcat (out_str, tmp_str);
537 break;
538 case CLASS_IR:
539 sprintf (tmp_str, "@R%ld", instr_data->arg_reg[datum_value]);
540 strcat (out_str, tmp_str);
541 break;
542 case CLASS_FLAGS:
543 sprintf (tmp_str, "0x%0lx", instr_data->flags);
544 strcat (out_str, tmp_str);
545 break;
546 case CLASS_REG_BYTE:
547 if (instr_data->arg_reg[datum_value] >= 0x8)
548 {
549 sprintf (tmp_str, "rl%ld",
550 instr_data->arg_reg[datum_value] - 0x8);
551 }
552 else
553 {
554 sprintf (tmp_str, "rh%ld", instr_data->arg_reg[datum_value]);
555 }
556 strcat (out_str, tmp_str);
557 break;
558 case CLASS_REG_WORD:
559 sprintf (tmp_str, "r%ld", instr_data->arg_reg[datum_value]);
560 strcat (out_str, tmp_str);
561 break;
562 case CLASS_REG_QUAD:
563 sprintf (tmp_str, "rq%ld", instr_data->arg_reg[datum_value]);
564 strcat (out_str, tmp_str);
565 break;
566 case CLASS_REG_LONG:
567 sprintf (tmp_str, "rr%ld", instr_data->arg_reg[datum_value]);
568 strcat (out_str, tmp_str);
569 break;
570 default:
571 break;
572 }
573 }
574
575 strcpy (instr_data->instr_asmsrc, out_str);
576}
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