Commit | Line | Data |
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7d9884b9 JG |
1 | /* Print Motorola 68k instructions for GDB, the GNU debugger. |
2 | Copyright 1986, 1987, 1989, 1991 Free Software Foundation, Inc. | |
dd3b648e RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
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 | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e RP |
19 | |
20 | #include <stdio.h> | |
21 | ||
22 | #include "defs.h" | |
dd3b648e | 23 | #include "symtab.h" |
7e258d18 | 24 | #include "opcode/m68k.h" |
dd3b648e RP |
25 | #include "gdbcore.h" |
26 | ||
1ab3bf1b JG |
27 | /* Local function prototypes */ |
28 | ||
29 | static int | |
30 | fetch_arg PARAMS ((unsigned char *, int, int)); | |
31 | ||
32 | static void | |
33 | print_base PARAMS ((int, int, FILE *)); | |
34 | ||
35 | static unsigned char * | |
36 | print_indexed PARAMS ((int, unsigned char *, CORE_ADDR, FILE *)); | |
37 | ||
38 | static unsigned char * | |
39 | print_insn_arg PARAMS ((char *, unsigned char *, unsigned char *, CORE_ADDR, | |
40 | FILE *)); | |
41 | ||
dd3b648e RP |
42 | /* 68k instructions are never longer than this many bytes. */ |
43 | #define MAXLEN 22 | |
44 | ||
45 | /* Number of elements in the opcode table. */ | |
46 | #define NOPCODES (sizeof m68k_opcodes / sizeof m68k_opcodes[0]) | |
47 | ||
48 | extern char *reg_names[]; | |
49 | char *fpcr_names[] = { "", "fpiar", "fpsr", "fpiar/fpsr", "fpcr", | |
50 | "fpiar/fpcr", "fpsr/fpcr", "fpiar-fpcr"}; | |
51 | ||
dd3b648e RP |
52 | |
53 | #define NEXTBYTE(p) (p += 2, ((char *)p)[-1]) | |
54 | ||
55 | #define NEXTWORD(p) \ | |
56 | (p += 2, ((((char *)p)[-2]) << 8) + p[-1]) | |
57 | ||
58 | #define NEXTLONG(p) \ | |
59 | (p += 4, (((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1]) | |
60 | ||
61 | #define NEXTSINGLE(p) \ | |
62 | (p += 4, *((float *)(p - 4))) | |
63 | ||
64 | #define NEXTDOUBLE(p) \ | |
65 | (p += 8, *((double *)(p - 8))) | |
66 | ||
67 | #define NEXTEXTEND(p) \ | |
68 | (p += 12, 0.0) /* Need a function to convert from extended to double | |
69 | precision... */ | |
70 | ||
71 | #define NEXTPACKED(p) \ | |
72 | (p += 12, 0.0) /* Need a function to convert from packed to double | |
73 | precision. Actually, it's easier to print a | |
74 | packed number than a double anyway, so maybe | |
75 | there should be a special case to handle this... */ | |
76 | \f | |
77 | /* Print the m68k instruction at address MEMADDR in debugged memory, | |
78 | on STREAM. Returns length of the instruction, in bytes. */ | |
79 | ||
80 | int | |
81 | print_insn (memaddr, stream) | |
82 | CORE_ADDR memaddr; | |
83 | FILE *stream; | |
84 | { | |
85 | unsigned char buffer[MAXLEN]; | |
86 | register int i; | |
87 | register unsigned char *p; | |
88 | register char *d; | |
89 | register int bestmask; | |
90 | int best; | |
91 | ||
1ab3bf1b | 92 | read_memory (memaddr, (char *) buffer, MAXLEN); |
dd3b648e RP |
93 | |
94 | bestmask = 0; | |
95 | best = -1; | |
96 | for (i = 0; i < NOPCODES; i++) | |
97 | { | |
98 | register unsigned int opcode = m68k_opcodes[i].opcode; | |
99 | register unsigned int match = m68k_opcodes[i].match; | |
100 | if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24))) | |
101 | && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16))) | |
102 | && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8))) | |
103 | && ((0xff & buffer[3] & match) == (0xff & opcode))) | |
104 | { | |
105 | /* Don't use for printout the variants of divul and divsl | |
106 | that have the same register number in two places. | |
107 | The more general variants will match instead. */ | |
108 | for (d = m68k_opcodes[i].args; *d; d += 2) | |
109 | if (d[1] == 'D') | |
110 | break; | |
111 | ||
112 | /* Don't use for printout the variants of most floating | |
113 | point coprocessor instructions which use the same | |
114 | register number in two places, as above. */ | |
115 | if (*d == 0) | |
116 | for (d = m68k_opcodes[i].args; *d; d += 2) | |
117 | if (d[1] == 't') | |
118 | break; | |
119 | ||
120 | if (*d == 0 && match > bestmask) | |
121 | { | |
122 | best = i; | |
123 | bestmask = match; | |
124 | } | |
125 | } | |
126 | } | |
127 | ||
128 | /* Handle undefined instructions. */ | |
129 | if (best < 0) | |
130 | { | |
131 | fprintf_filtered (stream, "0%o", (buffer[0] << 8) + buffer[1]); | |
132 | return 2; | |
133 | } | |
134 | ||
135 | fprintf_filtered (stream, "%s", m68k_opcodes[best].name); | |
136 | ||
137 | /* Point at first word of argument data, | |
138 | and at descriptor for first argument. */ | |
139 | p = buffer + 2; | |
140 | ||
141 | /* Why do this this way? -MelloN */ | |
142 | for (d = m68k_opcodes[best].args; *d; d += 2) | |
143 | { | |
144 | if (d[0] == '#') | |
145 | { | |
146 | if (d[1] == 'l' && p - buffer < 6) | |
147 | p = buffer + 6; | |
148 | else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8' ) | |
149 | p = buffer + 4; | |
150 | } | |
151 | if (d[1] >= '1' && d[1] <= '3' && p - buffer < 4) | |
152 | p = buffer + 4; | |
153 | if (d[1] >= '4' && d[1] <= '6' && p - buffer < 6) | |
154 | p = buffer + 6; | |
155 | if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4) | |
156 | p = buffer + 4; | |
157 | } | |
158 | ||
159 | d = m68k_opcodes[best].args; | |
160 | ||
161 | if (*d) | |
162 | fputs_filtered (" ", stream); | |
163 | ||
164 | while (*d) | |
165 | { | |
166 | p = print_insn_arg (d, buffer, p, memaddr + p - buffer, stream); | |
167 | d += 2; | |
168 | if (*d && *(d - 2) != 'I' && *d != 'k') | |
169 | fputs_filtered (",", stream); | |
170 | } | |
171 | return p - buffer; | |
172 | } | |
173 | ||
174 | static unsigned char * | |
175 | print_insn_arg (d, buffer, p, addr, stream) | |
176 | char *d; | |
177 | unsigned char *buffer; | |
178 | register unsigned char *p; | |
179 | CORE_ADDR addr; /* PC for this arg to be relative to */ | |
180 | FILE *stream; | |
181 | { | |
182 | register int val; | |
183 | register int place = d[1]; | |
184 | int regno; | |
185 | register char *regname; | |
186 | register unsigned char *p1; | |
187 | register double flval; | |
188 | int flt_p; | |
189 | ||
190 | switch (*d) | |
191 | { | |
192 | case 'C': | |
193 | fprintf_filtered (stream, "ccr"); | |
194 | break; | |
195 | ||
196 | case 'S': | |
197 | fprintf_filtered (stream, "sr"); | |
198 | break; | |
199 | ||
200 | case 'U': | |
201 | fprintf_filtered (stream, "usp"); | |
202 | break; | |
203 | ||
204 | case 'J': | |
205 | { | |
206 | static struct { char *name; int value; } names[] | |
207 | = {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002}, | |
208 | {"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802}, | |
209 | {"msp", 0x803}, {"isp", 0x804}}; | |
210 | ||
211 | val = fetch_arg (buffer, place, 12); | |
212 | for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--) | |
213 | if (names[regno].value == val) | |
214 | { | |
215 | fprintf_filtered (stream, names[regno].name); | |
216 | break; | |
217 | } | |
218 | if (regno < 0) | |
219 | fprintf_filtered (stream, "%d", val); | |
220 | } | |
221 | break; | |
222 | ||
223 | case 'Q': | |
224 | val = fetch_arg (buffer, place, 3); | |
225 | /* 0 means 8, except for the bkpt instruction... */ | |
226 | if (val == 0 && d[1] != 's') | |
227 | val = 8; | |
228 | fprintf_filtered (stream, "#%d", val); | |
229 | break; | |
230 | ||
231 | case 'M': | |
232 | val = fetch_arg (buffer, place, 8); | |
233 | if (val & 0x80) | |
234 | val = val - 0x100; | |
235 | fprintf_filtered (stream, "#%d", val); | |
236 | break; | |
237 | ||
238 | case 'T': | |
239 | val = fetch_arg (buffer, place, 4); | |
240 | fprintf_filtered (stream, "#%d", val); | |
241 | break; | |
242 | ||
243 | case 'D': | |
244 | fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 3)]); | |
245 | break; | |
246 | ||
247 | case 'A': | |
248 | fprintf_filtered (stream, "%s", | |
249 | reg_names[fetch_arg (buffer, place, 3) + 010]); | |
250 | break; | |
251 | ||
252 | case 'R': | |
253 | fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 4)]); | |
254 | break; | |
255 | ||
256 | case 'F': | |
257 | fprintf_filtered (stream, "fp%d", fetch_arg (buffer, place, 3)); | |
258 | break; | |
259 | ||
260 | case 'O': | |
261 | val = fetch_arg (buffer, place, 6); | |
262 | if (val & 0x20) | |
263 | fprintf_filtered (stream, "%s", reg_names [val & 7]); | |
264 | else | |
265 | fprintf_filtered (stream, "%d", val); | |
266 | break; | |
267 | ||
268 | case '+': | |
269 | fprintf_filtered (stream, "%s@+", | |
270 | reg_names[fetch_arg (buffer, place, 3) + 8]); | |
271 | break; | |
272 | ||
273 | case '-': | |
274 | fprintf_filtered (stream, "%s@-", | |
275 | reg_names[fetch_arg (buffer, place, 3) + 8]); | |
276 | break; | |
277 | ||
278 | case 'k': | |
279 | if (place == 'k') | |
280 | fprintf_filtered (stream, "{%s}", reg_names[fetch_arg (buffer, place, 3)]); | |
281 | else if (place == 'C') | |
282 | { | |
283 | val = fetch_arg (buffer, place, 7); | |
284 | if ( val > 63 ) /* This is a signed constant. */ | |
285 | val -= 128; | |
286 | fprintf_filtered (stream, "{#%d}", val); | |
287 | } | |
288 | else | |
289 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
290 | *d, place); | |
291 | break; | |
292 | ||
293 | case '#': | |
294 | case '^': | |
295 | p1 = buffer + (*d == '#' ? 2 : 4); | |
296 | if (place == 's') | |
297 | val = fetch_arg (buffer, place, 4); | |
298 | else if (place == 'C') | |
299 | val = fetch_arg (buffer, place, 7); | |
300 | else if (place == '8') | |
301 | val = fetch_arg (buffer, place, 3); | |
302 | else if (place == '3') | |
303 | val = fetch_arg (buffer, place, 8); | |
304 | else if (place == 'b') | |
305 | val = NEXTBYTE (p1); | |
306 | else if (place == 'w') | |
307 | val = NEXTWORD (p1); | |
308 | else if (place == 'l') | |
309 | val = NEXTLONG (p1); | |
310 | else | |
311 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
312 | *d, place); | |
313 | fprintf_filtered (stream, "#%d", val); | |
314 | break; | |
315 | ||
316 | case 'B': | |
317 | if (place == 'b') | |
318 | val = NEXTBYTE (p); | |
abefb1f1 PB |
319 | else if (place == 'B') |
320 | val = buffer[1]; | |
321 | else if (place == 'w' || place == 'W') | |
dd3b648e | 322 | val = NEXTWORD (p); |
abefb1f1 | 323 | else if (place == 'l' || place == 'L') |
dd3b648e RP |
324 | val = NEXTLONG (p); |
325 | else if (place == 'g') | |
326 | { | |
327 | val = ((char *)buffer)[1]; | |
328 | if (val == 0) | |
329 | val = NEXTWORD (p); | |
330 | else if (val == -1) | |
331 | val = NEXTLONG (p); | |
332 | } | |
333 | else if (place == 'c') | |
334 | { | |
335 | if (buffer[1] & 0x40) /* If bit six is one, long offset */ | |
336 | val = NEXTLONG (p); | |
337 | else | |
338 | val = NEXTWORD (p); | |
339 | } | |
340 | else | |
341 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
342 | *d, place); | |
343 | ||
344 | print_address (addr + val, stream); | |
345 | break; | |
346 | ||
347 | case 'd': | |
348 | val = NEXTWORD (p); | |
349 | fprintf_filtered (stream, "%s@(%d)", | |
350 | reg_names[fetch_arg (buffer, place, 3)], val); | |
351 | break; | |
352 | ||
353 | case 's': | |
354 | fprintf_filtered (stream, "%s", | |
355 | fpcr_names[fetch_arg (buffer, place, 3)]); | |
356 | break; | |
357 | ||
358 | case 'I': | |
359 | val = fetch_arg (buffer, 'd', 3); /* Get coprocessor ID... */ | |
360 | if (val != 1) /* Unusual coprocessor ID? */ | |
361 | fprintf_filtered (stream, "(cpid=%d) ", val); | |
362 | if (place == 'i') | |
363 | p += 2; /* Skip coprocessor extended operands */ | |
364 | break; | |
365 | ||
366 | case '*': | |
367 | case '~': | |
368 | case '%': | |
369 | case ';': | |
370 | case '@': | |
371 | case '!': | |
372 | case '$': | |
373 | case '?': | |
374 | case '/': | |
375 | case '&': | |
376 | ||
377 | if (place == 'd') | |
378 | { | |
379 | val = fetch_arg (buffer, 'x', 6); | |
380 | val = ((val & 7) << 3) + ((val >> 3) & 7); | |
381 | } | |
382 | else | |
383 | val = fetch_arg (buffer, 's', 6); | |
384 | ||
385 | /* Get register number assuming address register. */ | |
386 | regno = (val & 7) + 8; | |
387 | regname = reg_names[regno]; | |
388 | switch (val >> 3) | |
389 | { | |
390 | case 0: | |
391 | fprintf_filtered (stream, "%s", reg_names[val]); | |
392 | break; | |
393 | ||
394 | case 1: | |
395 | fprintf_filtered (stream, "%s", regname); | |
396 | break; | |
397 | ||
398 | case 2: | |
399 | fprintf_filtered (stream, "%s@", regname); | |
400 | break; | |
401 | ||
402 | case 3: | |
403 | fprintf_filtered (stream, "%s@+", regname); | |
404 | break; | |
405 | ||
406 | case 4: | |
407 | fprintf_filtered (stream, "%s@-", regname); | |
408 | break; | |
409 | ||
410 | case 5: | |
411 | val = NEXTWORD (p); | |
412 | fprintf_filtered (stream, "%s@(%d)", regname, val); | |
413 | break; | |
414 | ||
415 | case 6: | |
416 | p = print_indexed (regno, p, addr, stream); | |
417 | break; | |
418 | ||
419 | case 7: | |
420 | switch (val & 7) | |
421 | { | |
422 | case 0: | |
423 | val = NEXTWORD (p); | |
424 | fprintf_filtered (stream, "@#"); | |
425 | print_address (val, stream); | |
426 | break; | |
427 | ||
428 | case 1: | |
429 | val = NEXTLONG (p); | |
430 | fprintf_filtered (stream, "@#"); | |
431 | print_address (val, stream); | |
432 | break; | |
433 | ||
434 | case 2: | |
435 | val = NEXTWORD (p); | |
436 | print_address (addr + val, stream); | |
437 | break; | |
438 | ||
439 | case 3: | |
440 | p = print_indexed (-1, p, addr, stream); | |
441 | break; | |
442 | ||
443 | case 4: | |
444 | flt_p = 1; /* Assume it's a float... */ | |
445 | switch( place ) | |
446 | { | |
447 | case 'b': | |
448 | val = NEXTBYTE (p); | |
449 | flt_p = 0; | |
450 | break; | |
451 | ||
452 | case 'w': | |
453 | val = NEXTWORD (p); | |
454 | flt_p = 0; | |
455 | break; | |
456 | ||
457 | case 'l': | |
458 | val = NEXTLONG (p); | |
459 | flt_p = 0; | |
460 | break; | |
461 | ||
462 | case 'f': | |
463 | flval = NEXTSINGLE(p); | |
464 | break; | |
465 | ||
466 | case 'F': | |
467 | flval = NEXTDOUBLE(p); | |
468 | break; | |
469 | ||
470 | case 'x': | |
471 | flval = NEXTEXTEND(p); | |
472 | break; | |
473 | ||
474 | case 'p': | |
475 | flval = NEXTPACKED(p); | |
476 | break; | |
477 | ||
478 | default: | |
479 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
480 | *d, place); | |
481 | } | |
482 | if ( flt_p ) /* Print a float? */ | |
483 | fprintf_filtered (stream, "#%g", flval); | |
484 | else | |
485 | fprintf_filtered (stream, "#%d", val); | |
486 | break; | |
487 | ||
488 | default: | |
489 | fprintf_filtered (stream, "<invalid address mode 0%o>", val); | |
490 | } | |
491 | } | |
492 | break; | |
493 | ||
494 | case 'L': | |
495 | case 'l': | |
496 | if (place == 'w') | |
497 | { | |
498 | char doneany; | |
499 | p1 = buffer + 2; | |
500 | val = NEXTWORD (p1); | |
501 | /* Move the pointer ahead if this point is farther ahead | |
502 | than the last. */ | |
503 | p = p1 > p ? p1 : p; | |
504 | if (val == 0) | |
505 | { | |
506 | fputs_filtered ("#0", stream); | |
507 | break; | |
508 | } | |
509 | if (*d == 'l') | |
510 | { | |
511 | register int newval = 0; | |
512 | for (regno = 0; regno < 16; ++regno) | |
513 | if (val & (0x8000 >> regno)) | |
514 | newval |= 1 << regno; | |
515 | val = newval; | |
516 | } | |
517 | val &= 0xffff; | |
518 | doneany = 0; | |
519 | for (regno = 0; regno < 16; ++regno) | |
520 | if (val & (1 << regno)) | |
521 | { | |
522 | int first_regno; | |
523 | if (doneany) | |
524 | fputs_filtered ("/", stream); | |
525 | doneany = 1; | |
526 | fprintf_filtered (stream, "%s", reg_names[regno]); | |
527 | first_regno = regno; | |
528 | while (val & (1 << (regno + 1))) | |
529 | ++regno; | |
530 | if (regno > first_regno) | |
531 | fprintf_filtered (stream, "-%s", reg_names[regno]); | |
532 | } | |
533 | } | |
534 | else if (place == '3') | |
535 | { | |
536 | /* `fmovem' insn. */ | |
537 | char doneany; | |
538 | val = fetch_arg (buffer, place, 8); | |
539 | if (val == 0) | |
540 | { | |
541 | fputs_filtered ("#0", stream); | |
542 | break; | |
543 | } | |
544 | if (*d == 'l') | |
545 | { | |
546 | register int newval = 0; | |
547 | for (regno = 0; regno < 8; ++regno) | |
548 | if (val & (0x80 >> regno)) | |
549 | newval |= 1 << regno; | |
550 | val = newval; | |
551 | } | |
552 | val &= 0xff; | |
553 | doneany = 0; | |
554 | for (regno = 0; regno < 8; ++regno) | |
555 | if (val & (1 << regno)) | |
556 | { | |
557 | int first_regno; | |
558 | if (doneany) | |
559 | fputs_filtered ("/", stream); | |
560 | doneany = 1; | |
561 | fprintf_filtered (stream, "fp%d", regno); | |
562 | first_regno = regno; | |
563 | while (val & (1 << (regno + 1))) | |
564 | ++regno; | |
565 | if (regno > first_regno) | |
566 | fprintf_filtered (stream, "-fp%d", regno); | |
567 | } | |
568 | } | |
569 | else | |
570 | abort (); | |
571 | break; | |
572 | ||
573 | default: | |
574 | error ("Invalid arg format in opcode table: \"%c\".", *d); | |
575 | } | |
576 | ||
577 | return (unsigned char *) p; | |
578 | } | |
579 | ||
580 | /* Fetch BITS bits from a position in the instruction specified by CODE. | |
581 | CODE is a "place to put an argument", or 'x' for a destination | |
582 | that is a general address (mode and register). | |
583 | BUFFER contains the instruction. */ | |
584 | ||
585 | static int | |
586 | fetch_arg (buffer, code, bits) | |
587 | unsigned char *buffer; | |
1ab3bf1b | 588 | int code; |
dd3b648e RP |
589 | int bits; |
590 | { | |
591 | register int val; | |
592 | switch (code) | |
593 | { | |
594 | case 's': | |
595 | val = buffer[1]; | |
596 | break; | |
597 | ||
598 | case 'd': /* Destination, for register or quick. */ | |
599 | val = (buffer[0] << 8) + buffer[1]; | |
600 | val >>= 9; | |
601 | break; | |
602 | ||
603 | case 'x': /* Destination, for general arg */ | |
604 | val = (buffer[0] << 8) + buffer[1]; | |
605 | val >>= 6; | |
606 | break; | |
607 | ||
608 | case 'k': | |
609 | val = (buffer[3] >> 4); | |
610 | break; | |
611 | ||
612 | case 'C': | |
613 | val = buffer[3]; | |
614 | break; | |
615 | ||
616 | case '1': | |
617 | val = (buffer[2] << 8) + buffer[3]; | |
618 | val >>= 12; | |
619 | break; | |
620 | ||
621 | case '2': | |
622 | val = (buffer[2] << 8) + buffer[3]; | |
623 | val >>= 6; | |
624 | break; | |
625 | ||
626 | case '3': | |
627 | case 'j': | |
628 | val = (buffer[2] << 8) + buffer[3]; | |
629 | break; | |
630 | ||
631 | case '4': | |
632 | val = (buffer[4] << 8) + buffer[5]; | |
633 | val >>= 12; | |
634 | break; | |
635 | ||
636 | case '5': | |
637 | val = (buffer[4] << 8) + buffer[5]; | |
638 | val >>= 6; | |
639 | break; | |
640 | ||
641 | case '6': | |
642 | val = (buffer[4] << 8) + buffer[5]; | |
643 | break; | |
644 | ||
645 | case '7': | |
646 | val = (buffer[2] << 8) + buffer[3]; | |
647 | val >>= 7; | |
648 | break; | |
649 | ||
650 | case '8': | |
651 | val = (buffer[2] << 8) + buffer[3]; | |
652 | val >>= 10; | |
653 | break; | |
654 | ||
655 | default: | |
656 | abort (); | |
657 | } | |
658 | ||
659 | switch (bits) | |
660 | { | |
661 | case 3: | |
662 | return val & 7; | |
663 | case 4: | |
664 | return val & 017; | |
665 | case 5: | |
666 | return val & 037; | |
667 | case 6: | |
668 | return val & 077; | |
669 | case 7: | |
670 | return val & 0177; | |
671 | case 8: | |
672 | return val & 0377; | |
673 | case 12: | |
674 | return val & 07777; | |
675 | default: | |
676 | abort (); | |
677 | } | |
678 | } | |
679 | ||
680 | /* Print an indexed argument. The base register is BASEREG (-1 for pc). | |
681 | P points to extension word, in buffer. | |
682 | ADDR is the nominal core address of that extension word. */ | |
683 | ||
684 | static unsigned char * | |
685 | print_indexed (basereg, p, addr, stream) | |
686 | int basereg; | |
687 | unsigned char *p; | |
dd3b648e | 688 | CORE_ADDR addr; |
1ab3bf1b | 689 | FILE *stream; |
dd3b648e RP |
690 | { |
691 | register int word; | |
692 | static char *scales[] = {"", "*2", "*4", "*8"}; | |
693 | register int base_disp; | |
694 | register int outer_disp; | |
695 | char buf[40]; | |
696 | ||
697 | word = NEXTWORD (p); | |
698 | ||
699 | /* Generate the text for the index register. | |
700 | Where this will be output is not yet determined. */ | |
701 | sprintf (buf, "[%s.%c%s]", | |
702 | reg_names[(word >> 12) & 0xf], | |
703 | (word & 0x800) ? 'l' : 'w', | |
704 | scales[(word >> 9) & 3]); | |
705 | ||
706 | /* Handle the 68000 style of indexing. */ | |
707 | ||
708 | if ((word & 0x100) == 0) | |
709 | { | |
710 | print_base (basereg, | |
711 | ((word & 0x80) ? word | 0xff00 : word & 0xff) | |
712 | + ((basereg == -1) ? addr : 0), | |
713 | stream); | |
714 | fputs_filtered (buf, stream); | |
715 | return p; | |
716 | } | |
717 | ||
718 | /* Handle the generalized kind. */ | |
719 | /* First, compute the displacement to add to the base register. */ | |
720 | ||
721 | if (word & 0200) | |
722 | basereg = -2; | |
723 | if (word & 0100) | |
724 | buf[0] = 0; | |
725 | base_disp = 0; | |
726 | switch ((word >> 4) & 3) | |
727 | { | |
728 | case 2: | |
729 | base_disp = NEXTWORD (p); | |
730 | break; | |
731 | case 3: | |
732 | base_disp = NEXTLONG (p); | |
733 | } | |
734 | if (basereg == -1) | |
735 | base_disp += addr; | |
736 | ||
737 | /* Handle single-level case (not indirect) */ | |
738 | ||
739 | if ((word & 7) == 0) | |
740 | { | |
741 | print_base (basereg, base_disp, stream); | |
742 | fputs_filtered (buf, stream); | |
743 | return p; | |
744 | } | |
745 | ||
746 | /* Two level. Compute displacement to add after indirection. */ | |
747 | ||
748 | outer_disp = 0; | |
749 | switch (word & 3) | |
750 | { | |
751 | case 2: | |
752 | outer_disp = NEXTWORD (p); | |
753 | break; | |
754 | case 3: | |
755 | outer_disp = NEXTLONG (p); | |
756 | } | |
757 | ||
758 | fprintf_filtered (stream, "%d(", outer_disp); | |
759 | print_base (basereg, base_disp, stream); | |
760 | ||
761 | /* If postindexed, print the closeparen before the index. */ | |
762 | if (word & 4) | |
763 | fprintf_filtered (stream, ")%s", buf); | |
764 | /* If preindexed, print the closeparen after the index. */ | |
765 | else | |
766 | fprintf_filtered (stream, "%s)", buf); | |
767 | ||
768 | return p; | |
769 | } | |
770 | ||
771 | /* Print a base register REGNO and displacement DISP, on STREAM. | |
772 | REGNO = -1 for pc, -2 for none (suppressed). */ | |
773 | ||
774 | static void | |
775 | print_base (regno, disp, stream) | |
776 | int regno; | |
777 | int disp; | |
778 | FILE *stream; | |
779 | { | |
780 | if (regno == -2) | |
781 | fprintf_filtered (stream, "%d", disp); | |
782 | else if (regno == -1) | |
783 | fprintf_filtered (stream, "0x%x", disp); | |
784 | else | |
785 | fprintf_filtered (stream, "%d(%s)", disp, reg_names[regno]); | |
786 | } |