Commit | Line | Data |
---|---|---|
cd6e9098 ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
5d8fcc0a | 3 | static char sccsid[] = "@(#)vax.c 1.9 %G%"; |
cd6e9098 ML |
4 | |
5 | /* | |
6 | * Target machine dependent stuff. | |
7 | */ | |
8 | ||
9 | #include "defs.h" | |
10 | #include "machine.h" | |
11 | #include "process.h" | |
12 | #include "events.h" | |
13 | #include "main.h" | |
14 | #include "symbols.h" | |
15 | #include "source.h" | |
16 | #include "mappings.h" | |
17 | #include "object.h" | |
9882bead | 18 | #include "ops.h" |
cd6e9098 ML |
19 | #include <signal.h> |
20 | ||
21 | #ifndef public | |
22 | typedef unsigned int Address; | |
23 | typedef unsigned char Byte; | |
24 | typedef unsigned int Word; | |
25 | ||
26 | #define NREG 16 | |
27 | ||
28 | #define ARGP 12 | |
29 | #define FRP 13 | |
30 | #define STKP 14 | |
31 | #define PROGCTR 15 | |
32 | ||
33 | #define BITSPERBYTE 8 | |
34 | #define BITSPERWORD (BITSPERBYTE * sizeof(Word)) | |
35 | ||
36 | #define nargspassed(frame) argn(0, frame) | |
37 | ||
38 | #include "source.h" | |
39 | #include "symbols.h" | |
40 | ||
41 | Address pc; | |
42 | Address prtaddr; | |
43 | ||
44 | #endif | |
45 | ||
46 | private Address printop(); | |
47 | ||
48 | /* | |
49 | * Decode and print the instructions within the given address range. | |
50 | */ | |
51 | ||
52 | public printinst(lowaddr, highaddr) | |
53 | Address lowaddr; | |
54 | Address highaddr; | |
55 | { | |
56 | register Address addr; | |
57 | ||
58 | for (addr = lowaddr; addr <= highaddr; ) { | |
59 | addr = printop(addr); | |
60 | } | |
61 | prtaddr = addr; | |
62 | } | |
63 | ||
64 | /* | |
65 | * Another approach: print n instructions starting at the given address. | |
66 | */ | |
67 | ||
68 | public printninst(count, addr) | |
69 | int count; | |
70 | Address addr; | |
71 | { | |
72 | register Integer i; | |
73 | register Address newaddr; | |
74 | ||
75 | if (count <= 0) { | |
76 | error("non-positive repetition count"); | |
77 | } else { | |
78 | newaddr = addr; | |
79 | for (i = 0; i < count; i++) { | |
80 | newaddr = printop(newaddr); | |
81 | } | |
82 | prtaddr = newaddr; | |
83 | } | |
84 | } | |
85 | ||
86 | /* | |
87 | * Hacked version of adb's VAX instruction decoder. | |
88 | */ | |
89 | ||
90 | private Address printop(addr) | |
91 | Address addr; | |
92 | { | |
93 | Optab op; | |
94 | VaxOpcode ins; | |
95 | unsigned char mode; | |
96 | int argtype, amode, argno, argval; | |
97 | String reg; | |
98 | Boolean indexf; | |
99 | short offset; | |
100 | ||
101 | argval = 0; | |
102 | indexf = false; | |
103 | printf("%08x ", addr); | |
104 | iread(&ins, addr, sizeof(ins)); | |
105 | addr += 1; | |
106 | op = optab[ins]; | |
107 | printf("%s", op.iname); | |
108 | for (argno = 0; argno < op.numargs; argno++) { | |
109 | if (indexf == true) { | |
110 | indexf = false; | |
111 | } else if (argno == 0) { | |
112 | printf("\t"); | |
113 | } else { | |
114 | printf(","); | |
115 | } | |
116 | argtype = op.argtype[argno]; | |
117 | if (is_branch_disp(argtype)) { | |
118 | mode = 0xAF + (typelen(argtype) << 5); | |
119 | } else { | |
120 | iread(&mode, addr, sizeof(mode)); | |
121 | addr += 1; | |
122 | } | |
123 | reg = regname[regnm(mode)]; | |
124 | amode = addrmode(mode); | |
125 | switch (amode) { | |
126 | case LITSHORT: | |
127 | case LITUPTO31: | |
128 | case LITUPTO47: | |
129 | case LITUPTO63: | |
130 | if (typelen(argtype) == TYPF || typelen(argtype) ==TYPD) | |
131 | printf("$%s", fltimm[mode]); | |
132 | else | |
133 | printf("$%x", mode); | |
134 | argval = mode; | |
135 | break; | |
136 | ||
137 | case INDEX: | |
138 | printf("[%s]", reg); | |
139 | indexf = true; | |
140 | argno--; | |
141 | break; | |
142 | ||
143 | case REG: | |
144 | printf("%s", reg); | |
145 | break; | |
146 | ||
147 | case REGDEF: | |
148 | printf("(%s)", reg); | |
149 | break; | |
150 | ||
151 | case AUTODEC: | |
152 | printf("-(%s)", reg); | |
153 | break; | |
154 | ||
155 | case AUTOINC: | |
156 | if (reg != regname[PROGCTR]) { | |
157 | printf("(%s)+", reg); | |
158 | } else { | |
159 | printf("$"); | |
160 | switch (typelen(argtype)) { | |
161 | case TYPB: | |
162 | argval = printdisp(addr, 1, reg, amode); | |
163 | addr += 1; | |
164 | break; | |
165 | ||
166 | case TYPW: | |
167 | argval = printdisp(addr, 2, reg, amode); | |
168 | addr += 2; | |
169 | break; | |
170 | ||
171 | case TYPL: | |
172 | argval = printdisp(addr, 4, reg, amode); | |
173 | addr += 4; | |
174 | break; | |
175 | ||
176 | case TYPF: | |
177 | iread(&argval, addr, sizeof(argval)); | |
178 | printf("%06x", argval); | |
179 | addr += 4; | |
180 | break; | |
181 | ||
182 | case TYPQ: | |
183 | case TYPD: | |
184 | iread(&argval, addr, sizeof(argval)); | |
185 | printf("%06x", argval); | |
186 | iread(&argval, addr+4, sizeof(argval)); | |
187 | printf("%06x", argval); | |
188 | addr += 8; | |
189 | break; | |
190 | } | |
191 | } | |
192 | break; | |
193 | ||
194 | case AUTOINCDEF: | |
195 | if (reg == regname[PROGCTR]) { | |
196 | printf("*$"); | |
197 | argval = printdisp(addr, 4, reg, amode); | |
198 | addr += 4; | |
199 | } else { | |
200 | printf("*(%s)+", reg); | |
201 | } | |
202 | break; | |
203 | ||
204 | case BYTEDISP: | |
205 | argval = printdisp(addr, 1, reg, amode); | |
206 | addr += 1; | |
207 | break; | |
208 | ||
209 | case BYTEDISPDEF: | |
210 | printf("*"); | |
211 | argval = printdisp(addr, 1, reg, amode); | |
212 | addr += 1; | |
213 | break; | |
214 | ||
215 | case WORDDISP: | |
216 | argval = printdisp(addr, 2, reg, amode); | |
217 | addr += 2; | |
218 | break; | |
219 | ||
220 | case WORDDISPDEF: | |
221 | printf("*"); | |
222 | argval = printdisp(addr, 2, reg, amode); | |
223 | addr += 2; | |
224 | break; | |
225 | ||
226 | case LONGDISP: | |
227 | argval = printdisp(addr, 4, reg, amode); | |
228 | addr += 4; | |
229 | break; | |
230 | ||
231 | case LONGDISPDEF: | |
232 | printf("*"); | |
233 | argval = printdisp(addr, 4, reg, amode); | |
234 | addr += 4; | |
235 | break; | |
236 | } | |
237 | } | |
238 | if (ins == O_CASEB || ins == O_CASEW || ins == O_CASEL) { | |
239 | for (argno = 0; argno <= argval; argno++) { | |
240 | iread(&offset, addr, sizeof(offset)); | |
241 | printf("\n\t\t%d", offset); | |
242 | addr += 2; | |
243 | } | |
244 | } | |
245 | printf("\n"); | |
246 | return addr; | |
247 | } | |
248 | ||
249 | /* | |
250 | * Print the displacement of an instruction that uses displacement | |
251 | * addressing. | |
252 | */ | |
253 | ||
254 | private int printdisp(addr, nbytes, reg, mode) | |
255 | Address addr; | |
256 | int nbytes; | |
257 | char *reg; | |
258 | int mode; | |
259 | { | |
260 | char byte; | |
261 | short hword; | |
262 | int argval; | |
5d8fcc0a | 263 | Symbol f; |
cd6e9098 ML |
264 | |
265 | switch (nbytes) { | |
266 | case 1: | |
267 | iread(&byte, addr, sizeof(byte)); | |
268 | argval = byte; | |
269 | break; | |
270 | ||
271 | case 2: | |
272 | iread(&hword, addr, sizeof(hword)); | |
273 | argval = hword; | |
274 | break; | |
275 | ||
276 | case 4: | |
277 | iread(&argval, addr, sizeof(argval)); | |
278 | break; | |
279 | } | |
280 | if (reg == regname[PROGCTR] && mode >= BYTEDISP) { | |
281 | argval += addr + nbytes; | |
282 | } | |
283 | if (reg == regname[PROGCTR]) { | |
5d8fcc0a ML |
284 | f = whatblock((Address) argval + 2); |
285 | if (codeloc(f) == argval + 2) { | |
286 | printf("%s", symname(f)); | |
287 | } else { | |
288 | printf("%x", argval); | |
289 | } | |
cd6e9098 ML |
290 | } else { |
291 | printf("%d(%s)", argval, reg); | |
292 | } | |
293 | return argval; | |
294 | } | |
295 | ||
296 | /* | |
297 | * Print the contents of the addresses within the given range | |
298 | * according to the given format. | |
299 | */ | |
300 | ||
301 | typedef struct { | |
302 | String name; | |
303 | String printfstring; | |
304 | int length; | |
305 | } Format; | |
306 | ||
307 | private Format fmt[] = { | |
308 | { "d", " %d", sizeof(short) }, | |
309 | { "D", " %ld", sizeof(long) }, | |
310 | { "o", " %o", sizeof(short) }, | |
311 | { "O", " %lo", sizeof(long) }, | |
312 | { "x", " %04x", sizeof(short) }, | |
313 | { "X", " %08x", sizeof(long) }, | |
314 | { "b", " \\%o", sizeof(char) }, | |
315 | { "c", " '%c'", sizeof(char) }, | |
316 | { "s", "%c", sizeof(char) }, | |
5d8fcc0a | 317 | { "f", " %f", sizeof(float) }, |
cd6e9098 ML |
318 | { "g", " %g", sizeof(double) }, |
319 | { nil, nil, 0 } | |
320 | }; | |
321 | ||
08cf9c08 ML |
322 | private Format *findformat(s) |
323 | String s; | |
324 | { | |
325 | register Format *f; | |
326 | ||
327 | f = &fmt[0]; | |
328 | while (f->name != nil and not streq(f->name, s)) { | |
329 | ++f; | |
330 | } | |
331 | if (f->name == nil) { | |
332 | error("bad print format \"%s\"", s); | |
333 | } | |
334 | return f; | |
335 | } | |
336 | ||
cd6e9098 ML |
337 | public Address printdata(lowaddr, highaddr, format) |
338 | Address lowaddr; | |
339 | Address highaddr; | |
340 | String format; | |
341 | { | |
342 | register int n; | |
343 | register Address addr; | |
344 | register Format *f; | |
345 | int value; | |
346 | ||
347 | if (lowaddr > highaddr) { | |
348 | error("first address larger than second"); | |
349 | } | |
08cf9c08 | 350 | f = findformat(format); |
cd6e9098 ML |
351 | n = 0; |
352 | value = 0; | |
353 | for (addr = lowaddr; addr <= highaddr; addr += f->length) { | |
354 | if (n == 0) { | |
355 | printf("%08x: ", addr); | |
356 | } | |
357 | dread(&value, addr, f->length); | |
358 | printf(f->printfstring, value); | |
359 | ++n; | |
360 | if (n >= (16 div f->length)) { | |
361 | putchar('\n'); | |
362 | n = 0; | |
363 | } | |
364 | } | |
365 | if (n != 0) { | |
366 | putchar('\n'); | |
367 | } | |
368 | prtaddr = addr; | |
369 | return addr; | |
370 | } | |
371 | ||
372 | /* | |
373 | * The other approach is to print n items starting with a given address. | |
374 | */ | |
375 | ||
376 | public printndata(count, startaddr, format) | |
377 | int count; | |
378 | Address startaddr; | |
379 | String format; | |
380 | { | |
381 | register int i, n; | |
382 | register Address addr; | |
383 | register Format *f; | |
384 | register Boolean isstring; | |
5d8fcc0a ML |
385 | char c; |
386 | union { | |
387 | char charv; | |
388 | short shortv; | |
389 | int intv; | |
390 | float floatv; | |
391 | double doublev; | |
392 | } value; | |
cd6e9098 ML |
393 | |
394 | if (count <= 0) { | |
395 | error("non-positive repetition count"); | |
396 | } | |
08cf9c08 | 397 | f = findformat(format); |
cd6e9098 ML |
398 | isstring = (Boolean) streq(f->name, "s"); |
399 | n = 0; | |
400 | addr = startaddr; | |
5d8fcc0a | 401 | value.intv = 0; |
cd6e9098 ML |
402 | for (i = 0; i < count; i++) { |
403 | if (n == 0) { | |
404 | printf("%08x: ", addr); | |
405 | } | |
406 | if (isstring) { | |
407 | putchar('"'); | |
5d8fcc0a ML |
408 | dread(&c, addr, sizeof(char)); |
409 | while (c != '\0') { | |
410 | printchar(c); | |
cd6e9098 | 411 | ++addr; |
5d8fcc0a | 412 | dread(&c, addr, sizeof(char)); |
cd6e9098 ML |
413 | } |
414 | putchar('"'); | |
415 | putchar('\n'); | |
416 | n = 0; | |
417 | addr += sizeof(String); | |
418 | } else { | |
419 | dread(&value, addr, f->length); | |
420 | printf(f->printfstring, value); | |
421 | ++n; | |
422 | if (n >= (16 div f->length)) { | |
423 | putchar('\n'); | |
424 | n = 0; | |
425 | } | |
426 | addr += f->length; | |
427 | } | |
428 | } | |
429 | if (n != 0) { | |
430 | putchar('\n'); | |
431 | } | |
432 | prtaddr = addr; | |
433 | } | |
434 | ||
08cf9c08 ML |
435 | /* |
436 | * Print out a value according to the given format. | |
437 | */ | |
438 | ||
439 | public printvalue(v, format) | |
440 | long v; | |
441 | String format; | |
442 | { | |
443 | Format *f; | |
444 | char *p, *q; | |
445 | ||
446 | f = findformat(format); | |
447 | if (streq(f->name, "s")) { | |
448 | putchar('"'); | |
449 | p = (char *) &v; | |
450 | q = p + sizeof(v); | |
451 | while (p < q) { | |
452 | printchar(*p); | |
453 | ++p; | |
454 | } | |
455 | putchar('"'); | |
456 | } else { | |
457 | printf(f->printfstring, v); | |
458 | } | |
459 | putchar('\n'); | |
460 | } | |
461 | ||
cd6e9098 ML |
462 | /* |
463 | * Print out an execution time error. | |
8026876b | 464 | * Assumes the source position of the error has been calculated. |
cd6e9098 ML |
465 | * |
466 | * Have to check if the -r option was specified; if so then | |
467 | * the object file information hasn't been read in yet. | |
468 | */ | |
469 | ||
470 | public printerror() | |
471 | { | |
472 | extern Integer sys_nsig; | |
473 | extern String sys_siglist[]; | |
cd6e9098 ML |
474 | Integer err; |
475 | ||
476 | if (isfinished(process)) { | |
477 | printf("\"%s\" exits with code %d\n", objname, exitcode(process)); | |
478 | erecover(); | |
479 | } | |
480 | if (runfirst) { | |
481 | fprintf(stderr, "Entering debugger ..."); | |
482 | init(); | |
483 | fprintf(stderr, " type 'help' for help\n"); | |
484 | } | |
cd6e9098 ML |
485 | err = errnum(process); |
486 | if (err == SIGINT) { | |
487 | printf("\n\ninterrupt "); | |
488 | printloc(); | |
489 | } else if (err == SIGTRAP) { | |
490 | printf("\nerror "); | |
491 | printloc(); | |
492 | } else { | |
493 | if (err < 0 or err > sys_nsig) { | |
494 | printf("\nsignal %d ", err); | |
495 | } else { | |
496 | printf("\n%s ", sys_siglist[err]); | |
497 | } | |
498 | printloc(); | |
499 | } | |
500 | putchar('\n'); | |
501 | if (curline > 0) { | |
502 | printlines(curline, curline); | |
503 | } else { | |
504 | printinst(pc, pc); | |
505 | } | |
506 | erecover(); | |
507 | } | |
508 | ||
cd6e9098 ML |
509 | /* |
510 | * Note the termination of the program. We do this so as to avoid | |
511 | * having the process exit, which would make the values of variables | |
512 | * inaccessible. We do want to flush all output buffers here, | |
513 | * otherwise it'll never get done. | |
514 | */ | |
515 | ||
516 | public endprogram() | |
517 | { | |
518 | Integer exitcode; | |
519 | ||
520 | stepto(nextaddr(pc, true)); | |
521 | printnews(); | |
522 | exitcode = argn(1, nil); | |
523 | printf("\nexecution completed, exit code is %d\n", exitcode); | |
524 | getsrcpos(); | |
525 | erecover(); | |
526 | } | |
527 | ||
528 | /* | |
529 | * Single step the machine a source line (or instruction if "inst_tracing" | |
38f911d6 | 530 | * is true). If "isnext" is true, skip over procedure calls. |
cd6e9098 ML |
531 | */ |
532 | ||
533 | private Address getcall(); | |
534 | ||
535 | public dostep(isnext) | |
536 | Boolean isnext; | |
537 | { | |
538 | register Address addr; | |
539 | register Lineno line; | |
540 | String filename; | |
541 | ||
542 | addr = nextaddr(pc, isnext); | |
38f911d6 | 543 | if (not inst_tracing and nlhdr.nlines != 0) { |
cd6e9098 ML |
544 | line = linelookup(addr); |
545 | while (line == 0) { | |
546 | addr = nextaddr(addr, isnext); | |
547 | line = linelookup(addr); | |
548 | } | |
38f911d6 ML |
549 | curline = line; |
550 | } else { | |
551 | curline = 0; | |
cd6e9098 ML |
552 | } |
553 | stepto(addr); | |
cd6e9098 ML |
554 | filename = srcfilename(addr); |
555 | setsource(filename); | |
556 | } | |
557 | ||
558 | /* | |
559 | * Compute the next address that will be executed from the given one. | |
560 | * If "isnext" is true then consider a procedure call as straight line code. | |
561 | * | |
562 | * We must unfortunately do much of the same work that is necessary | |
563 | * to print instructions. In addition we have to deal with branches. | |
564 | * Unconditional branches we just follow, for conditional branches | |
565 | * we continue execution to the current location and then single step | |
566 | * the machine. We assume that the last argument in an instruction | |
567 | * that branches is the branch address (or relative offset). | |
568 | */ | |
569 | ||
570 | public Address nextaddr(startaddr, isnext) | |
571 | Address startaddr; | |
572 | Boolean isnext; | |
573 | { | |
574 | register Address addr; | |
575 | Optab op; | |
576 | VaxOpcode ins; | |
577 | unsigned char mode; | |
578 | int argtype, amode, argno, argval; | |
579 | String r; | |
580 | Boolean indexf; | |
581 | enum { KNOWN, SEQUENTIAL, BRANCH } addrstatus; | |
582 | ||
583 | argval = 0; | |
584 | indexf = false; | |
585 | addr = startaddr; | |
586 | iread(&ins, addr, sizeof(ins)); | |
587 | switch (ins) { | |
588 | case O_BRB: | |
589 | case O_BRW: | |
590 | case O_JMP: | |
591 | addrstatus = BRANCH; | |
592 | break; | |
593 | ||
594 | case O_BSBB: | |
595 | case O_BSBW: | |
596 | case O_JSB: | |
597 | case O_CALLG: | |
598 | case O_CALLS: | |
599 | if (isnext) { | |
600 | addrstatus = SEQUENTIAL; | |
601 | } else { | |
602 | addrstatus = KNOWN; | |
603 | stepto(addr); | |
604 | pstep(process); | |
605 | addr = reg(PROGCTR); | |
606 | pc = addr; | |
eac2165c | 607 | curfunc = whatblock(pc); |
cd6e9098 ML |
608 | if (not isbperr()) { |
609 | printstatus(); | |
eac2165c ML |
610 | /* NOTREACHED */ |
611 | } | |
612 | bpact(); | |
613 | if (nosource(curfunc) and canskip(curfunc) and | |
614 | nlhdr.nlines != 0) { | |
615 | addrstatus = KNOWN; | |
616 | addr = return_addr(); | |
617 | stepto(addr); | |
3b5f59dc | 618 | bpact(); |
cd6e9098 | 619 | } else { |
eac2165c | 620 | callnews(/* iscall = */ true); |
cd6e9098 ML |
621 | } |
622 | } | |
623 | break; | |
624 | ||
625 | case O_RSB: | |
626 | case O_RET: | |
627 | addrstatus = KNOWN; | |
628 | callnews(/* iscall = */ false); | |
629 | addr = return_addr(); | |
630 | stepto(addr); | |
3b5f59dc | 631 | bpact(); |
cd6e9098 ML |
632 | break; |
633 | ||
634 | case O_BNEQ: case O_BEQL: case O_BGTR: | |
635 | case O_BLEQ: case O_BGEQ: case O_BLSS: | |
636 | case O_BGTRU: case O_BLEQU: case O_BVC: | |
637 | case O_BVS: case O_BCC: case O_BCS: | |
638 | case O_CASEB: case O_CASEW: case O_CASEL: | |
639 | case O_BBS: case O_BBC: case O_BBSS: case O_BBCS: | |
640 | case O_BBSC: case O_BBCC: case O_BBSSI: | |
641 | case O_BBCCI: case O_BLBS: case O_BLBC: | |
642 | case O_ACBL: case O_AOBLSS: case O_AOBLEQ: | |
643 | case O_SOBGEQ: case O_SOBGTR: | |
644 | addrstatus = KNOWN; | |
645 | stepto(addr); | |
646 | pstep(process); | |
647 | addr = reg(PROGCTR); | |
648 | pc = addr; | |
649 | if (not isbperr()) { | |
650 | printstatus(); | |
651 | } | |
652 | break; | |
653 | ||
654 | default: | |
655 | addrstatus = SEQUENTIAL; | |
656 | break; | |
657 | } | |
658 | if (addrstatus != KNOWN) { | |
659 | addr += 1; | |
660 | op = optab[ins]; | |
661 | for (argno = 0; argno < op.numargs; argno++) { | |
662 | if (indexf == true) { | |
663 | indexf = false; | |
664 | } | |
665 | argtype = op.argtype[argno]; | |
666 | if (is_branch_disp(argtype)) { | |
667 | mode = 0xAF + (typelen(argtype) << 5); | |
668 | } else { | |
669 | iread(&mode, addr, sizeof(mode)); | |
670 | addr += 1; | |
671 | } | |
672 | r = regname[regnm(mode)]; | |
673 | amode = addrmode(mode); | |
674 | switch (amode) { | |
675 | case LITSHORT: | |
676 | case LITUPTO31: | |
677 | case LITUPTO47: | |
678 | case LITUPTO63: | |
679 | argval = mode; | |
680 | break; | |
681 | ||
682 | case INDEX: | |
683 | indexf = true; | |
684 | --argno; | |
685 | break; | |
686 | ||
687 | case REG: | |
688 | case REGDEF: | |
689 | case AUTODEC: | |
690 | break; | |
691 | ||
692 | case AUTOINC: | |
693 | if (r == regname[PROGCTR]) { | |
694 | switch (typelen(argtype)) { | |
695 | case TYPB: | |
696 | argval = getdisp(addr, 1, r, amode); | |
697 | addr += 1; | |
698 | break; | |
699 | ||
700 | case TYPW: | |
701 | argval = getdisp(addr, 2, r, amode); | |
702 | addr += 2; | |
703 | break; | |
704 | ||
705 | case TYPL: | |
706 | argval = getdisp(addr, 4, r, amode); | |
707 | addr += 4; | |
708 | break; | |
709 | ||
710 | case TYPF: | |
711 | iread(&argval, addr, sizeof(argval)); | |
712 | addr += 4; | |
713 | break; | |
714 | ||
715 | case TYPQ: | |
716 | case TYPD: | |
717 | iread(&argval, addr+4, sizeof(argval)); | |
718 | addr += 8; | |
719 | break; | |
720 | } | |
721 | } | |
722 | break; | |
723 | ||
724 | case AUTOINCDEF: | |
725 | if (r == regname[PROGCTR]) { | |
726 | argval = getdisp(addr, 4, r, amode); | |
727 | addr += 4; | |
728 | } | |
729 | break; | |
730 | ||
731 | case BYTEDISP: | |
732 | case BYTEDISPDEF: | |
733 | argval = getdisp(addr, 1, r, amode); | |
734 | addr += 1; | |
735 | break; | |
736 | ||
737 | case WORDDISP: | |
738 | case WORDDISPDEF: | |
739 | argval = getdisp(addr, 2, r, amode); | |
740 | addr += 2; | |
741 | break; | |
742 | ||
743 | case LONGDISP: | |
744 | case LONGDISPDEF: | |
745 | argval = getdisp(addr, 4, r, amode); | |
746 | addr += 4; | |
747 | break; | |
748 | } | |
749 | } | |
750 | if (ins == O_CALLS or ins == O_CALLG) { | |
751 | argval += 2; | |
752 | } | |
753 | if (addrstatus == BRANCH) { | |
754 | addr = argval; | |
755 | } | |
756 | } | |
757 | return addr; | |
758 | } | |
759 | ||
760 | /* | |
761 | * Get the displacement of an instruction that uses displacement addressing. | |
762 | */ | |
763 | ||
764 | private int getdisp(addr, nbytes, reg, mode) | |
765 | Address addr; | |
766 | int nbytes; | |
767 | String reg; | |
768 | int mode; | |
769 | { | |
770 | char byte; | |
771 | short hword; | |
772 | int argval; | |
773 | ||
774 | switch (nbytes) { | |
775 | case 1: | |
776 | iread(&byte, addr, sizeof(byte)); | |
777 | argval = byte; | |
778 | break; | |
779 | ||
780 | case 2: | |
781 | iread(&hword, addr, sizeof(hword)); | |
782 | argval = hword; | |
783 | break; | |
784 | ||
785 | case 4: | |
786 | iread(&argval, addr, sizeof(argval)); | |
787 | break; | |
788 | } | |
789 | if (reg == regname[PROGCTR] && mode >= BYTEDISP) { | |
790 | argval += addr + nbytes; | |
791 | } | |
792 | return argval; | |
793 | } | |
794 | ||
795 | #define BP_OP O_BPT /* breakpoint trap */ | |
796 | #define BP_ERRNO SIGTRAP /* signal received at a breakpoint */ | |
797 | ||
798 | /* | |
799 | * Setting a breakpoint at a location consists of saving | |
800 | * the word at the location and poking a BP_OP there. | |
801 | * | |
802 | * We save the locations and words on a list for use in unsetting. | |
803 | */ | |
804 | ||
805 | typedef struct Savelist *Savelist; | |
806 | ||
807 | struct Savelist { | |
808 | Address location; | |
809 | Byte save; | |
810 | Byte refcount; | |
811 | Savelist link; | |
812 | }; | |
813 | ||
814 | private Savelist savelist; | |
815 | ||
816 | /* | |
817 | * Set a breakpoint at the given address. Only save the word there | |
818 | * if it's not already a breakpoint. | |
819 | */ | |
820 | ||
821 | public setbp(addr) | |
822 | Address addr; | |
823 | { | |
824 | Byte w; | |
825 | Byte save; | |
826 | register Savelist newsave, s; | |
827 | ||
828 | for (s = savelist; s != nil; s = s->link) { | |
829 | if (s->location == addr) { | |
830 | s->refcount++; | |
831 | return; | |
832 | } | |
833 | } | |
08cf9c08 | 834 | iread(&save, addr, sizeof(save)); |
cd6e9098 ML |
835 | newsave = new(Savelist); |
836 | newsave->location = addr; | |
837 | newsave->save = save; | |
838 | newsave->refcount = 1; | |
839 | newsave->link = savelist; | |
840 | savelist = newsave; | |
841 | w = BP_OP; | |
842 | iwrite(&w, addr, sizeof(w)); | |
843 | } | |
844 | ||
845 | /* | |
846 | * Unset a breakpoint; unfortunately we have to search the SAVELIST | |
847 | * to find the saved value. The assumption is that the SAVELIST will | |
848 | * usually be quite small. | |
849 | */ | |
850 | ||
851 | public unsetbp(addr) | |
852 | Address addr; | |
853 | { | |
854 | register Savelist s, prev; | |
855 | ||
856 | prev = nil; | |
857 | for (s = savelist; s != nil; s = s->link) { | |
858 | if (s->location == addr) { | |
859 | iwrite(&s->save, addr, sizeof(s->save)); | |
860 | s->refcount--; | |
861 | if (s->refcount == 0) { | |
862 | if (prev == nil) { | |
863 | savelist = s->link; | |
864 | } else { | |
865 | prev->link = s->link; | |
866 | } | |
867 | dispose(s); | |
868 | } | |
869 | return; | |
870 | } | |
871 | prev = s; | |
872 | } | |
873 | panic("unsetbp: couldn't find address %d", addr); | |
874 | } | |
875 | ||
876 | /* | |
877 | * Predicate to test if the reason the process stopped was because | |
878 | * of a breakpoint. | |
879 | */ | |
880 | ||
881 | public Boolean isbperr() | |
882 | { | |
883 | return (Boolean) (not isfinished(process) and errnum(process) == SIGTRAP); | |
884 | } | |
885 | ||
886 | /* | |
887 | * Enter a procedure by creating and executing a call instruction. | |
888 | */ | |
889 | ||
890 | #define CALLSIZE 7 /* size of call instruction */ | |
891 | ||
892 | public beginproc(p, argc) | |
893 | Symbol p; | |
894 | Integer argc; | |
895 | { | |
896 | char save[CALLSIZE]; | |
897 | struct { | |
898 | VaxOpcode op; | |
899 | unsigned char numargs; | |
900 | unsigned char mode; | |
901 | char addr[sizeof(long)]; /* unaligned long */ | |
902 | } call; | |
903 | long dest; | |
904 | ||
905 | pc = 2; | |
906 | iread(save, pc, sizeof(save)); | |
907 | call.op = O_CALLS; | |
908 | call.numargs = argc; | |
909 | call.mode = 0xef; | |
910 | dest = codeloc(p) - 2 - (pc + 7); | |
911 | mov(&dest, call.addr, sizeof(call.addr)); | |
912 | iwrite(&call, pc, sizeof(call)); | |
913 | setreg(PROGCTR, pc); | |
914 | pstep(process); | |
915 | iwrite(save, pc, sizeof(save)); | |
916 | pc = reg(PROGCTR); | |
917 | if (not isbperr()) { | |
918 | printstatus(); | |
919 | } | |
920 | } |