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 | 19 | |
dd3b648e | 20 | #include "defs.h" |
dd3b648e | 21 | #include "symtab.h" |
7e258d18 | 22 | #include "opcode/m68k.h" |
dd3b648e RP |
23 | #include "gdbcore.h" |
24 | ||
1ab3bf1b JG |
25 | /* Local function prototypes */ |
26 | ||
27 | static int | |
28 | fetch_arg PARAMS ((unsigned char *, int, int)); | |
29 | ||
30 | static void | |
31 | print_base PARAMS ((int, int, FILE *)); | |
32 | ||
33 | static unsigned char * | |
34 | print_indexed PARAMS ((int, unsigned char *, CORE_ADDR, FILE *)); | |
35 | ||
36 | static unsigned char * | |
37 | print_insn_arg PARAMS ((char *, unsigned char *, unsigned char *, CORE_ADDR, | |
38 | FILE *)); | |
39 | ||
dd3b648e RP |
40 | /* 68k instructions are never longer than this many bytes. */ |
41 | #define MAXLEN 22 | |
42 | ||
43 | /* Number of elements in the opcode table. */ | |
44 | #define NOPCODES (sizeof m68k_opcodes / sizeof m68k_opcodes[0]) | |
45 | ||
46 | extern char *reg_names[]; | |
47 | char *fpcr_names[] = { "", "fpiar", "fpsr", "fpiar/fpsr", "fpcr", | |
48 | "fpiar/fpcr", "fpsr/fpcr", "fpiar-fpcr"}; | |
49 | ||
dd3b648e RP |
50 | |
51 | #define NEXTBYTE(p) (p += 2, ((char *)p)[-1]) | |
52 | ||
53 | #define NEXTWORD(p) \ | |
54 | (p += 2, ((((char *)p)[-2]) << 8) + p[-1]) | |
55 | ||
56 | #define NEXTLONG(p) \ | |
57 | (p += 4, (((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1]) | |
58 | ||
59 | #define NEXTSINGLE(p) \ | |
60 | (p += 4, *((float *)(p - 4))) | |
61 | ||
62 | #define NEXTDOUBLE(p) \ | |
63 | (p += 8, *((double *)(p - 8))) | |
64 | ||
65 | #define NEXTEXTEND(p) \ | |
66 | (p += 12, 0.0) /* Need a function to convert from extended to double | |
67 | precision... */ | |
68 | ||
69 | #define NEXTPACKED(p) \ | |
70 | (p += 12, 0.0) /* Need a function to convert from packed to double | |
71 | precision. Actually, it's easier to print a | |
72 | packed number than a double anyway, so maybe | |
73 | there should be a special case to handle this... */ | |
74 | \f | |
75 | /* Print the m68k instruction at address MEMADDR in debugged memory, | |
76 | on STREAM. Returns length of the instruction, in bytes. */ | |
77 | ||
78 | int | |
79 | print_insn (memaddr, stream) | |
80 | CORE_ADDR memaddr; | |
81 | FILE *stream; | |
82 | { | |
83 | unsigned char buffer[MAXLEN]; | |
84 | register int i; | |
85 | register unsigned char *p; | |
86 | register char *d; | |
87 | register int bestmask; | |
88 | int best; | |
89 | ||
1ab3bf1b | 90 | read_memory (memaddr, (char *) buffer, MAXLEN); |
dd3b648e RP |
91 | |
92 | bestmask = 0; | |
93 | best = -1; | |
94 | for (i = 0; i < NOPCODES; i++) | |
95 | { | |
96 | register unsigned int opcode = m68k_opcodes[i].opcode; | |
97 | register unsigned int match = m68k_opcodes[i].match; | |
98 | if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24))) | |
99 | && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16))) | |
100 | && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8))) | |
101 | && ((0xff & buffer[3] & match) == (0xff & opcode))) | |
102 | { | |
103 | /* Don't use for printout the variants of divul and divsl | |
104 | that have the same register number in two places. | |
105 | The more general variants will match instead. */ | |
106 | for (d = m68k_opcodes[i].args; *d; d += 2) | |
107 | if (d[1] == 'D') | |
108 | break; | |
109 | ||
110 | /* Don't use for printout the variants of most floating | |
111 | point coprocessor instructions which use the same | |
112 | register number in two places, as above. */ | |
113 | if (*d == 0) | |
114 | for (d = m68k_opcodes[i].args; *d; d += 2) | |
115 | if (d[1] == 't') | |
116 | break; | |
117 | ||
118 | if (*d == 0 && match > bestmask) | |
119 | { | |
120 | best = i; | |
121 | bestmask = match; | |
122 | } | |
123 | } | |
124 | } | |
125 | ||
126 | /* Handle undefined instructions. */ | |
127 | if (best < 0) | |
128 | { | |
129 | fprintf_filtered (stream, "0%o", (buffer[0] << 8) + buffer[1]); | |
130 | return 2; | |
131 | } | |
132 | ||
133 | fprintf_filtered (stream, "%s", m68k_opcodes[best].name); | |
134 | ||
135 | /* Point at first word of argument data, | |
136 | and at descriptor for first argument. */ | |
137 | p = buffer + 2; | |
138 | ||
139 | /* Why do this this way? -MelloN */ | |
140 | for (d = m68k_opcodes[best].args; *d; d += 2) | |
141 | { | |
142 | if (d[0] == '#') | |
143 | { | |
144 | if (d[1] == 'l' && p - buffer < 6) | |
145 | p = buffer + 6; | |
146 | else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8' ) | |
147 | p = buffer + 4; | |
148 | } | |
149 | if (d[1] >= '1' && d[1] <= '3' && p - buffer < 4) | |
150 | p = buffer + 4; | |
151 | if (d[1] >= '4' && d[1] <= '6' && p - buffer < 6) | |
152 | p = buffer + 6; | |
153 | if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4) | |
154 | p = buffer + 4; | |
155 | } | |
156 | ||
157 | d = m68k_opcodes[best].args; | |
158 | ||
159 | if (*d) | |
160 | fputs_filtered (" ", stream); | |
161 | ||
162 | while (*d) | |
163 | { | |
164 | p = print_insn_arg (d, buffer, p, memaddr + p - buffer, stream); | |
165 | d += 2; | |
166 | if (*d && *(d - 2) != 'I' && *d != 'k') | |
167 | fputs_filtered (",", stream); | |
168 | } | |
169 | return p - buffer; | |
170 | } | |
171 | ||
172 | static unsigned char * | |
173 | print_insn_arg (d, buffer, p, addr, stream) | |
174 | char *d; | |
175 | unsigned char *buffer; | |
176 | register unsigned char *p; | |
177 | CORE_ADDR addr; /* PC for this arg to be relative to */ | |
178 | FILE *stream; | |
179 | { | |
180 | register int val; | |
181 | register int place = d[1]; | |
182 | int regno; | |
183 | register char *regname; | |
184 | register unsigned char *p1; | |
185 | register double flval; | |
186 | int flt_p; | |
187 | ||
188 | switch (*d) | |
189 | { | |
190 | case 'C': | |
191 | fprintf_filtered (stream, "ccr"); | |
192 | break; | |
193 | ||
194 | case 'S': | |
195 | fprintf_filtered (stream, "sr"); | |
196 | break; | |
197 | ||
198 | case 'U': | |
199 | fprintf_filtered (stream, "usp"); | |
200 | break; | |
201 | ||
202 | case 'J': | |
203 | { | |
204 | static struct { char *name; int value; } names[] | |
205 | = {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002}, | |
206 | {"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802}, | |
207 | {"msp", 0x803}, {"isp", 0x804}}; | |
208 | ||
209 | val = fetch_arg (buffer, place, 12); | |
210 | for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--) | |
211 | if (names[regno].value == val) | |
212 | { | |
213 | fprintf_filtered (stream, names[regno].name); | |
214 | break; | |
215 | } | |
216 | if (regno < 0) | |
217 | fprintf_filtered (stream, "%d", val); | |
218 | } | |
219 | break; | |
220 | ||
221 | case 'Q': | |
222 | val = fetch_arg (buffer, place, 3); | |
223 | /* 0 means 8, except for the bkpt instruction... */ | |
224 | if (val == 0 && d[1] != 's') | |
225 | val = 8; | |
226 | fprintf_filtered (stream, "#%d", val); | |
227 | break; | |
228 | ||
229 | case 'M': | |
230 | val = fetch_arg (buffer, place, 8); | |
231 | if (val & 0x80) | |
232 | val = val - 0x100; | |
233 | fprintf_filtered (stream, "#%d", val); | |
234 | break; | |
235 | ||
236 | case 'T': | |
237 | val = fetch_arg (buffer, place, 4); | |
238 | fprintf_filtered (stream, "#%d", val); | |
239 | break; | |
240 | ||
241 | case 'D': | |
242 | fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 3)]); | |
243 | break; | |
244 | ||
245 | case 'A': | |
246 | fprintf_filtered (stream, "%s", | |
247 | reg_names[fetch_arg (buffer, place, 3) + 010]); | |
248 | break; | |
249 | ||
250 | case 'R': | |
251 | fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 4)]); | |
252 | break; | |
253 | ||
254 | case 'F': | |
255 | fprintf_filtered (stream, "fp%d", fetch_arg (buffer, place, 3)); | |
256 | break; | |
257 | ||
258 | case 'O': | |
259 | val = fetch_arg (buffer, place, 6); | |
260 | if (val & 0x20) | |
261 | fprintf_filtered (stream, "%s", reg_names [val & 7]); | |
262 | else | |
263 | fprintf_filtered (stream, "%d", val); | |
264 | break; | |
265 | ||
266 | case '+': | |
267 | fprintf_filtered (stream, "%s@+", | |
268 | reg_names[fetch_arg (buffer, place, 3) + 8]); | |
269 | break; | |
270 | ||
271 | case '-': | |
272 | fprintf_filtered (stream, "%s@-", | |
273 | reg_names[fetch_arg (buffer, place, 3) + 8]); | |
274 | break; | |
275 | ||
276 | case 'k': | |
277 | if (place == 'k') | |
278 | fprintf_filtered (stream, "{%s}", reg_names[fetch_arg (buffer, place, 3)]); | |
279 | else if (place == 'C') | |
280 | { | |
281 | val = fetch_arg (buffer, place, 7); | |
282 | if ( val > 63 ) /* This is a signed constant. */ | |
283 | val -= 128; | |
284 | fprintf_filtered (stream, "{#%d}", val); | |
285 | } | |
286 | else | |
287 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
288 | *d, place); | |
289 | break; | |
290 | ||
291 | case '#': | |
292 | case '^': | |
293 | p1 = buffer + (*d == '#' ? 2 : 4); | |
294 | if (place == 's') | |
295 | val = fetch_arg (buffer, place, 4); | |
296 | else if (place == 'C') | |
297 | val = fetch_arg (buffer, place, 7); | |
298 | else if (place == '8') | |
299 | val = fetch_arg (buffer, place, 3); | |
300 | else if (place == '3') | |
301 | val = fetch_arg (buffer, place, 8); | |
302 | else if (place == 'b') | |
303 | val = NEXTBYTE (p1); | |
304 | else if (place == 'w') | |
305 | val = NEXTWORD (p1); | |
306 | else if (place == 'l') | |
307 | val = NEXTLONG (p1); | |
308 | else | |
309 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
310 | *d, place); | |
311 | fprintf_filtered (stream, "#%d", val); | |
312 | break; | |
313 | ||
314 | case 'B': | |
315 | if (place == 'b') | |
316 | val = NEXTBYTE (p); | |
abefb1f1 | 317 | else if (place == 'B') |
72b1aa30 | 318 | val = ((char *)buffer)[1]; |
abefb1f1 | 319 | else if (place == 'w' || place == 'W') |
dd3b648e | 320 | val = NEXTWORD (p); |
abefb1f1 | 321 | else if (place == 'l' || place == 'L') |
dd3b648e RP |
322 | val = NEXTLONG (p); |
323 | else if (place == 'g') | |
324 | { | |
325 | val = ((char *)buffer)[1]; | |
326 | if (val == 0) | |
327 | val = NEXTWORD (p); | |
328 | else if (val == -1) | |
329 | val = NEXTLONG (p); | |
330 | } | |
331 | else if (place == 'c') | |
332 | { | |
333 | if (buffer[1] & 0x40) /* If bit six is one, long offset */ | |
334 | val = NEXTLONG (p); | |
335 | else | |
336 | val = NEXTWORD (p); | |
337 | } | |
338 | else | |
339 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
340 | *d, place); | |
341 | ||
342 | print_address (addr + val, stream); | |
343 | break; | |
344 | ||
345 | case 'd': | |
346 | val = NEXTWORD (p); | |
347 | fprintf_filtered (stream, "%s@(%d)", | |
348 | reg_names[fetch_arg (buffer, place, 3)], val); | |
349 | break; | |
350 | ||
351 | case 's': | |
352 | fprintf_filtered (stream, "%s", | |
353 | fpcr_names[fetch_arg (buffer, place, 3)]); | |
354 | break; | |
355 | ||
356 | case 'I': | |
357 | val = fetch_arg (buffer, 'd', 3); /* Get coprocessor ID... */ | |
358 | if (val != 1) /* Unusual coprocessor ID? */ | |
359 | fprintf_filtered (stream, "(cpid=%d) ", val); | |
360 | if (place == 'i') | |
361 | p += 2; /* Skip coprocessor extended operands */ | |
362 | break; | |
363 | ||
364 | case '*': | |
365 | case '~': | |
366 | case '%': | |
367 | case ';': | |
368 | case '@': | |
369 | case '!': | |
370 | case '$': | |
371 | case '?': | |
372 | case '/': | |
373 | case '&': | |
374 | ||
375 | if (place == 'd') | |
376 | { | |
377 | val = fetch_arg (buffer, 'x', 6); | |
378 | val = ((val & 7) << 3) + ((val >> 3) & 7); | |
379 | } | |
380 | else | |
381 | val = fetch_arg (buffer, 's', 6); | |
382 | ||
383 | /* Get register number assuming address register. */ | |
384 | regno = (val & 7) + 8; | |
385 | regname = reg_names[regno]; | |
386 | switch (val >> 3) | |
387 | { | |
388 | case 0: | |
389 | fprintf_filtered (stream, "%s", reg_names[val]); | |
390 | break; | |
391 | ||
392 | case 1: | |
393 | fprintf_filtered (stream, "%s", regname); | |
394 | break; | |
395 | ||
396 | case 2: | |
397 | fprintf_filtered (stream, "%s@", regname); | |
398 | break; | |
399 | ||
400 | case 3: | |
401 | fprintf_filtered (stream, "%s@+", regname); | |
402 | break; | |
403 | ||
404 | case 4: | |
405 | fprintf_filtered (stream, "%s@-", regname); | |
406 | break; | |
407 | ||
408 | case 5: | |
409 | val = NEXTWORD (p); | |
410 | fprintf_filtered (stream, "%s@(%d)", regname, val); | |
411 | break; | |
412 | ||
413 | case 6: | |
414 | p = print_indexed (regno, p, addr, stream); | |
415 | break; | |
416 | ||
417 | case 7: | |
418 | switch (val & 7) | |
419 | { | |
420 | case 0: | |
421 | val = NEXTWORD (p); | |
422 | fprintf_filtered (stream, "@#"); | |
423 | print_address (val, stream); | |
424 | break; | |
425 | ||
426 | case 1: | |
427 | val = NEXTLONG (p); | |
428 | fprintf_filtered (stream, "@#"); | |
429 | print_address (val, stream); | |
430 | break; | |
431 | ||
432 | case 2: | |
433 | val = NEXTWORD (p); | |
434 | print_address (addr + val, stream); | |
435 | break; | |
436 | ||
437 | case 3: | |
438 | p = print_indexed (-1, p, addr, stream); | |
439 | break; | |
440 | ||
441 | case 4: | |
442 | flt_p = 1; /* Assume it's a float... */ | |
443 | switch( place ) | |
444 | { | |
445 | case 'b': | |
446 | val = NEXTBYTE (p); | |
447 | flt_p = 0; | |
448 | break; | |
449 | ||
450 | case 'w': | |
451 | val = NEXTWORD (p); | |
452 | flt_p = 0; | |
453 | break; | |
454 | ||
455 | case 'l': | |
456 | val = NEXTLONG (p); | |
457 | flt_p = 0; | |
458 | break; | |
459 | ||
460 | case 'f': | |
461 | flval = NEXTSINGLE(p); | |
462 | break; | |
463 | ||
464 | case 'F': | |
465 | flval = NEXTDOUBLE(p); | |
466 | break; | |
467 | ||
468 | case 'x': | |
469 | flval = NEXTEXTEND(p); | |
470 | break; | |
471 | ||
472 | case 'p': | |
473 | flval = NEXTPACKED(p); | |
474 | break; | |
475 | ||
476 | default: | |
477 | error ("Invalid arg format in opcode table: \"%c%c\".", | |
478 | *d, place); | |
479 | } | |
480 | if ( flt_p ) /* Print a float? */ | |
481 | fprintf_filtered (stream, "#%g", flval); | |
482 | else | |
483 | fprintf_filtered (stream, "#%d", val); | |
484 | break; | |
485 | ||
486 | default: | |
487 | fprintf_filtered (stream, "<invalid address mode 0%o>", val); | |
488 | } | |
489 | } | |
490 | break; | |
491 | ||
492 | case 'L': | |
493 | case 'l': | |
494 | if (place == 'w') | |
495 | { | |
496 | char doneany; | |
497 | p1 = buffer + 2; | |
498 | val = NEXTWORD (p1); | |
499 | /* Move the pointer ahead if this point is farther ahead | |
500 | than the last. */ | |
501 | p = p1 > p ? p1 : p; | |
502 | if (val == 0) | |
503 | { | |
504 | fputs_filtered ("#0", stream); | |
505 | break; | |
506 | } | |
507 | if (*d == 'l') | |
508 | { | |
509 | register int newval = 0; | |
510 | for (regno = 0; regno < 16; ++regno) | |
511 | if (val & (0x8000 >> regno)) | |
512 | newval |= 1 << regno; | |
513 | val = newval; | |
514 | } | |
515 | val &= 0xffff; | |
516 | doneany = 0; | |
517 | for (regno = 0; regno < 16; ++regno) | |
518 | if (val & (1 << regno)) | |
519 | { | |
520 | int first_regno; | |
521 | if (doneany) | |
522 | fputs_filtered ("/", stream); | |
523 | doneany = 1; | |
524 | fprintf_filtered (stream, "%s", reg_names[regno]); | |
525 | first_regno = regno; | |
526 | while (val & (1 << (regno + 1))) | |
527 | ++regno; | |
528 | if (regno > first_regno) | |
529 | fprintf_filtered (stream, "-%s", reg_names[regno]); | |
530 | } | |
531 | } | |
532 | else if (place == '3') | |
533 | { | |
534 | /* `fmovem' insn. */ | |
535 | char doneany; | |
536 | val = fetch_arg (buffer, place, 8); | |
537 | if (val == 0) | |
538 | { | |
539 | fputs_filtered ("#0", stream); | |
540 | break; | |
541 | } | |
542 | if (*d == 'l') | |
543 | { | |
544 | register int newval = 0; | |
545 | for (regno = 0; regno < 8; ++regno) | |
546 | if (val & (0x80 >> regno)) | |
547 | newval |= 1 << regno; | |
548 | val = newval; | |
549 | } | |
550 | val &= 0xff; | |
551 | doneany = 0; | |
552 | for (regno = 0; regno < 8; ++regno) | |
553 | if (val & (1 << regno)) | |
554 | { | |
555 | int first_regno; | |
556 | if (doneany) | |
557 | fputs_filtered ("/", stream); | |
558 | doneany = 1; | |
559 | fprintf_filtered (stream, "fp%d", regno); | |
560 | first_regno = regno; | |
561 | while (val & (1 << (regno + 1))) | |
562 | ++regno; | |
563 | if (regno > first_regno) | |
564 | fprintf_filtered (stream, "-fp%d", regno); | |
565 | } | |
566 | } | |
567 | else | |
568 | abort (); | |
569 | break; | |
570 | ||
571 | default: | |
572 | error ("Invalid arg format in opcode table: \"%c\".", *d); | |
573 | } | |
574 | ||
575 | return (unsigned char *) p; | |
576 | } | |
577 | ||
578 | /* Fetch BITS bits from a position in the instruction specified by CODE. | |
579 | CODE is a "place to put an argument", or 'x' for a destination | |
580 | that is a general address (mode and register). | |
581 | BUFFER contains the instruction. */ | |
582 | ||
583 | static int | |
584 | fetch_arg (buffer, code, bits) | |
585 | unsigned char *buffer; | |
1ab3bf1b | 586 | int code; |
dd3b648e RP |
587 | int bits; |
588 | { | |
589 | register int val; | |
590 | switch (code) | |
591 | { | |
592 | case 's': | |
593 | val = buffer[1]; | |
594 | break; | |
595 | ||
596 | case 'd': /* Destination, for register or quick. */ | |
597 | val = (buffer[0] << 8) + buffer[1]; | |
598 | val >>= 9; | |
599 | break; | |
600 | ||
601 | case 'x': /* Destination, for general arg */ | |
602 | val = (buffer[0] << 8) + buffer[1]; | |
603 | val >>= 6; | |
604 | break; | |
605 | ||
606 | case 'k': | |
607 | val = (buffer[3] >> 4); | |
608 | break; | |
609 | ||
610 | case 'C': | |
611 | val = buffer[3]; | |
612 | break; | |
613 | ||
614 | case '1': | |
615 | val = (buffer[2] << 8) + buffer[3]; | |
616 | val >>= 12; | |
617 | break; | |
618 | ||
619 | case '2': | |
620 | val = (buffer[2] << 8) + buffer[3]; | |
621 | val >>= 6; | |
622 | break; | |
623 | ||
624 | case '3': | |
625 | case 'j': | |
626 | val = (buffer[2] << 8) + buffer[3]; | |
627 | break; | |
628 | ||
629 | case '4': | |
630 | val = (buffer[4] << 8) + buffer[5]; | |
631 | val >>= 12; | |
632 | break; | |
633 | ||
634 | case '5': | |
635 | val = (buffer[4] << 8) + buffer[5]; | |
636 | val >>= 6; | |
637 | break; | |
638 | ||
639 | case '6': | |
640 | val = (buffer[4] << 8) + buffer[5]; | |
641 | break; | |
642 | ||
643 | case '7': | |
644 | val = (buffer[2] << 8) + buffer[3]; | |
645 | val >>= 7; | |
646 | break; | |
647 | ||
648 | case '8': | |
649 | val = (buffer[2] << 8) + buffer[3]; | |
650 | val >>= 10; | |
651 | break; | |
652 | ||
653 | default: | |
654 | abort (); | |
655 | } | |
656 | ||
657 | switch (bits) | |
658 | { | |
659 | case 3: | |
660 | return val & 7; | |
661 | case 4: | |
662 | return val & 017; | |
663 | case 5: | |
664 | return val & 037; | |
665 | case 6: | |
666 | return val & 077; | |
667 | case 7: | |
668 | return val & 0177; | |
669 | case 8: | |
670 | return val & 0377; | |
671 | case 12: | |
672 | return val & 07777; | |
673 | default: | |
674 | abort (); | |
675 | } | |
676 | } | |
677 | ||
678 | /* Print an indexed argument. The base register is BASEREG (-1 for pc). | |
679 | P points to extension word, in buffer. | |
680 | ADDR is the nominal core address of that extension word. */ | |
681 | ||
682 | static unsigned char * | |
683 | print_indexed (basereg, p, addr, stream) | |
684 | int basereg; | |
685 | unsigned char *p; | |
dd3b648e | 686 | CORE_ADDR addr; |
1ab3bf1b | 687 | FILE *stream; |
dd3b648e RP |
688 | { |
689 | register int word; | |
690 | static char *scales[] = {"", "*2", "*4", "*8"}; | |
691 | register int base_disp; | |
692 | register int outer_disp; | |
693 | char buf[40]; | |
694 | ||
695 | word = NEXTWORD (p); | |
696 | ||
697 | /* Generate the text for the index register. | |
698 | Where this will be output is not yet determined. */ | |
699 | sprintf (buf, "[%s.%c%s]", | |
700 | reg_names[(word >> 12) & 0xf], | |
701 | (word & 0x800) ? 'l' : 'w', | |
702 | scales[(word >> 9) & 3]); | |
703 | ||
704 | /* Handle the 68000 style of indexing. */ | |
705 | ||
706 | if ((word & 0x100) == 0) | |
707 | { | |
708 | print_base (basereg, | |
709 | ((word & 0x80) ? word | 0xff00 : word & 0xff) | |
710 | + ((basereg == -1) ? addr : 0), | |
711 | stream); | |
712 | fputs_filtered (buf, stream); | |
713 | return p; | |
714 | } | |
715 | ||
716 | /* Handle the generalized kind. */ | |
717 | /* First, compute the displacement to add to the base register. */ | |
718 | ||
719 | if (word & 0200) | |
720 | basereg = -2; | |
721 | if (word & 0100) | |
722 | buf[0] = 0; | |
723 | base_disp = 0; | |
724 | switch ((word >> 4) & 3) | |
725 | { | |
726 | case 2: | |
727 | base_disp = NEXTWORD (p); | |
728 | break; | |
729 | case 3: | |
730 | base_disp = NEXTLONG (p); | |
731 | } | |
732 | if (basereg == -1) | |
733 | base_disp += addr; | |
734 | ||
735 | /* Handle single-level case (not indirect) */ | |
736 | ||
737 | if ((word & 7) == 0) | |
738 | { | |
739 | print_base (basereg, base_disp, stream); | |
740 | fputs_filtered (buf, stream); | |
741 | return p; | |
742 | } | |
743 | ||
744 | /* Two level. Compute displacement to add after indirection. */ | |
745 | ||
746 | outer_disp = 0; | |
747 | switch (word & 3) | |
748 | { | |
749 | case 2: | |
750 | outer_disp = NEXTWORD (p); | |
751 | break; | |
752 | case 3: | |
753 | outer_disp = NEXTLONG (p); | |
754 | } | |
755 | ||
756 | fprintf_filtered (stream, "%d(", outer_disp); | |
757 | print_base (basereg, base_disp, stream); | |
758 | ||
759 | /* If postindexed, print the closeparen before the index. */ | |
760 | if (word & 4) | |
761 | fprintf_filtered (stream, ")%s", buf); | |
762 | /* If preindexed, print the closeparen after the index. */ | |
763 | else | |
764 | fprintf_filtered (stream, "%s)", buf); | |
765 | ||
766 | return p; | |
767 | } | |
768 | ||
769 | /* Print a base register REGNO and displacement DISP, on STREAM. | |
770 | REGNO = -1 for pc, -2 for none (suppressed). */ | |
771 | ||
772 | static void | |
773 | print_base (regno, disp, stream) | |
774 | int regno; | |
775 | int disp; | |
776 | FILE *stream; | |
777 | { | |
778 | if (regno == -2) | |
779 | fprintf_filtered (stream, "%d", disp); | |
780 | else if (regno == -1) | |
781 | fprintf_filtered (stream, "0x%x", disp); | |
782 | else | |
783 | fprintf_filtered (stream, "%d(%s)", disp, reg_names[regno]); | |
784 | } |