Commit | Line | Data |
---|---|---|
cd6e9098 ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
2fd0f574 SL |
3 | static char sccsid[] = "@(#)machine.c 1.9 8/5/83"; |
4 | ||
5 | static char rcsid[] = "$Header: machine.c,v 1.3 84/03/27 10:21:26 linton Exp $"; | |
cd6e9098 ML |
6 | |
7 | /* | |
8 | * Target machine dependent stuff. | |
9 | */ | |
10 | ||
11 | #include "defs.h" | |
12 | #include "machine.h" | |
13 | #include "process.h" | |
2fd0f574 | 14 | #include "runtime.h" |
cd6e9098 ML |
15 | #include "events.h" |
16 | #include "main.h" | |
17 | #include "symbols.h" | |
18 | #include "source.h" | |
19 | #include "mappings.h" | |
20 | #include "object.h" | |
9882bead | 21 | #include "ops.h" |
cd6e9098 ML |
22 | #include <signal.h> |
23 | ||
24 | #ifndef public | |
25 | typedef unsigned int Address; | |
26 | typedef unsigned char Byte; | |
27 | typedef unsigned int Word; | |
28 | ||
29 | #define NREG 16 | |
30 | ||
31 | #define ARGP 12 | |
32 | #define FRP 13 | |
33 | #define STKP 14 | |
34 | #define PROGCTR 15 | |
35 | ||
36 | #define BITSPERBYTE 8 | |
37 | #define BITSPERWORD (BITSPERBYTE * sizeof(Word)) | |
38 | ||
39 | #define nargspassed(frame) argn(0, frame) | |
40 | ||
41 | #include "source.h" | |
42 | #include "symbols.h" | |
43 | ||
44 | Address pc; | |
45 | Address prtaddr; | |
46 | ||
47 | #endif | |
48 | ||
49 | private Address printop(); | |
50 | ||
51 | /* | |
52 | * Decode and print the instructions within the given address range. | |
53 | */ | |
54 | ||
55 | public printinst(lowaddr, highaddr) | |
56 | Address lowaddr; | |
57 | Address highaddr; | |
58 | { | |
59 | register Address addr; | |
60 | ||
61 | for (addr = lowaddr; addr <= highaddr; ) { | |
62 | addr = printop(addr); | |
63 | } | |
64 | prtaddr = addr; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Another approach: print n instructions starting at the given address. | |
69 | */ | |
70 | ||
71 | public printninst(count, addr) | |
72 | int count; | |
73 | Address addr; | |
74 | { | |
75 | register Integer i; | |
76 | register Address newaddr; | |
77 | ||
78 | if (count <= 0) { | |
79 | error("non-positive repetition count"); | |
80 | } else { | |
81 | newaddr = addr; | |
82 | for (i = 0; i < count; i++) { | |
83 | newaddr = printop(newaddr); | |
84 | } | |
85 | prtaddr = newaddr; | |
86 | } | |
87 | } | |
88 | ||
89 | /* | |
90 | * Hacked version of adb's VAX instruction decoder. | |
91 | */ | |
92 | ||
93 | private Address printop(addr) | |
94 | Address addr; | |
95 | { | |
96 | Optab op; | |
97 | VaxOpcode ins; | |
98 | unsigned char mode; | |
99 | int argtype, amode, argno, argval; | |
100 | String reg; | |
101 | Boolean indexf; | |
102 | short offset; | |
103 | ||
104 | argval = 0; | |
105 | indexf = false; | |
106 | printf("%08x ", addr); | |
107 | iread(&ins, addr, sizeof(ins)); | |
108 | addr += 1; | |
109 | op = optab[ins]; | |
110 | printf("%s", op.iname); | |
111 | for (argno = 0; argno < op.numargs; argno++) { | |
112 | if (indexf == true) { | |
113 | indexf = false; | |
114 | } else if (argno == 0) { | |
115 | printf("\t"); | |
116 | } else { | |
117 | printf(","); | |
118 | } | |
119 | argtype = op.argtype[argno]; | |
120 | if (is_branch_disp(argtype)) { | |
121 | mode = 0xAF + (typelen(argtype) << 5); | |
122 | } else { | |
123 | iread(&mode, addr, sizeof(mode)); | |
124 | addr += 1; | |
125 | } | |
126 | reg = regname[regnm(mode)]; | |
127 | amode = addrmode(mode); | |
128 | switch (amode) { | |
129 | case LITSHORT: | |
130 | case LITUPTO31: | |
131 | case LITUPTO47: | |
132 | case LITUPTO63: | |
133 | if (typelen(argtype) == TYPF || typelen(argtype) ==TYPD) | |
134 | printf("$%s", fltimm[mode]); | |
135 | else | |
136 | printf("$%x", mode); | |
137 | argval = mode; | |
138 | break; | |
139 | ||
140 | case INDEX: | |
141 | printf("[%s]", reg); | |
142 | indexf = true; | |
143 | argno--; | |
144 | break; | |
145 | ||
146 | case REG: | |
147 | printf("%s", reg); | |
148 | break; | |
149 | ||
150 | case REGDEF: | |
151 | printf("(%s)", reg); | |
152 | break; | |
153 | ||
154 | case AUTODEC: | |
155 | printf("-(%s)", reg); | |
156 | break; | |
157 | ||
158 | case AUTOINC: | |
159 | if (reg != regname[PROGCTR]) { | |
160 | printf("(%s)+", reg); | |
161 | } else { | |
162 | printf("$"); | |
163 | switch (typelen(argtype)) { | |
164 | case TYPB: | |
165 | argval = printdisp(addr, 1, reg, amode); | |
166 | addr += 1; | |
167 | break; | |
168 | ||
169 | case TYPW: | |
170 | argval = printdisp(addr, 2, reg, amode); | |
171 | addr += 2; | |
172 | break; | |
173 | ||
174 | case TYPL: | |
175 | argval = printdisp(addr, 4, reg, amode); | |
176 | addr += 4; | |
177 | break; | |
178 | ||
179 | case TYPF: | |
180 | iread(&argval, addr, sizeof(argval)); | |
181 | printf("%06x", argval); | |
182 | addr += 4; | |
183 | break; | |
184 | ||
185 | case TYPQ: | |
186 | case TYPD: | |
187 | iread(&argval, addr, sizeof(argval)); | |
188 | printf("%06x", argval); | |
189 | iread(&argval, addr+4, sizeof(argval)); | |
190 | printf("%06x", argval); | |
191 | addr += 8; | |
192 | break; | |
193 | } | |
194 | } | |
195 | break; | |
196 | ||
197 | case AUTOINCDEF: | |
198 | if (reg == regname[PROGCTR]) { | |
199 | printf("*$"); | |
200 | argval = printdisp(addr, 4, reg, amode); | |
201 | addr += 4; | |
202 | } else { | |
203 | printf("*(%s)+", reg); | |
204 | } | |
205 | break; | |
206 | ||
207 | case BYTEDISP: | |
208 | argval = printdisp(addr, 1, reg, amode); | |
209 | addr += 1; | |
210 | break; | |
211 | ||
212 | case BYTEDISPDEF: | |
213 | printf("*"); | |
214 | argval = printdisp(addr, 1, reg, amode); | |
215 | addr += 1; | |
216 | break; | |
217 | ||
218 | case WORDDISP: | |
219 | argval = printdisp(addr, 2, reg, amode); | |
220 | addr += 2; | |
221 | break; | |
222 | ||
223 | case WORDDISPDEF: | |
224 | printf("*"); | |
225 | argval = printdisp(addr, 2, reg, amode); | |
226 | addr += 2; | |
227 | break; | |
228 | ||
229 | case LONGDISP: | |
230 | argval = printdisp(addr, 4, reg, amode); | |
231 | addr += 4; | |
232 | break; | |
233 | ||
234 | case LONGDISPDEF: | |
235 | printf("*"); | |
236 | argval = printdisp(addr, 4, reg, amode); | |
237 | addr += 4; | |
238 | break; | |
239 | } | |
240 | } | |
241 | if (ins == O_CASEB || ins == O_CASEW || ins == O_CASEL) { | |
242 | for (argno = 0; argno <= argval; argno++) { | |
243 | iread(&offset, addr, sizeof(offset)); | |
244 | printf("\n\t\t%d", offset); | |
245 | addr += 2; | |
246 | } | |
247 | } | |
248 | printf("\n"); | |
249 | return addr; | |
250 | } | |
251 | ||
252 | /* | |
253 | * Print the displacement of an instruction that uses displacement | |
254 | * addressing. | |
255 | */ | |
256 | ||
257 | private int printdisp(addr, nbytes, reg, mode) | |
258 | Address addr; | |
259 | int nbytes; | |
260 | char *reg; | |
261 | int mode; | |
262 | { | |
263 | char byte; | |
264 | short hword; | |
265 | int argval; | |
5d8fcc0a | 266 | Symbol f; |
cd6e9098 ML |
267 | |
268 | switch (nbytes) { | |
269 | case 1: | |
270 | iread(&byte, addr, sizeof(byte)); | |
271 | argval = byte; | |
272 | break; | |
273 | ||
274 | case 2: | |
275 | iread(&hword, addr, sizeof(hword)); | |
276 | argval = hword; | |
277 | break; | |
278 | ||
279 | case 4: | |
280 | iread(&argval, addr, sizeof(argval)); | |
281 | break; | |
282 | } | |
283 | if (reg == regname[PROGCTR] && mode >= BYTEDISP) { | |
284 | argval += addr + nbytes; | |
285 | } | |
286 | if (reg == regname[PROGCTR]) { | |
5d8fcc0a ML |
287 | f = whatblock((Address) argval + 2); |
288 | if (codeloc(f) == argval + 2) { | |
289 | printf("%s", symname(f)); | |
290 | } else { | |
291 | printf("%x", argval); | |
292 | } | |
cd6e9098 ML |
293 | } else { |
294 | printf("%d(%s)", argval, reg); | |
295 | } | |
296 | return argval; | |
297 | } | |
298 | ||
299 | /* | |
300 | * Print the contents of the addresses within the given range | |
301 | * according to the given format. | |
302 | */ | |
303 | ||
304 | typedef struct { | |
305 | String name; | |
306 | String printfstring; | |
307 | int length; | |
308 | } Format; | |
309 | ||
310 | private Format fmt[] = { | |
311 | { "d", " %d", sizeof(short) }, | |
312 | { "D", " %ld", sizeof(long) }, | |
313 | { "o", " %o", sizeof(short) }, | |
314 | { "O", " %lo", sizeof(long) }, | |
315 | { "x", " %04x", sizeof(short) }, | |
316 | { "X", " %08x", sizeof(long) }, | |
317 | { "b", " \\%o", sizeof(char) }, | |
318 | { "c", " '%c'", sizeof(char) }, | |
319 | { "s", "%c", sizeof(char) }, | |
5d8fcc0a | 320 | { "f", " %f", sizeof(float) }, |
cd6e9098 ML |
321 | { "g", " %g", sizeof(double) }, |
322 | { nil, nil, 0 } | |
323 | }; | |
324 | ||
08cf9c08 ML |
325 | private Format *findformat(s) |
326 | String s; | |
327 | { | |
328 | register Format *f; | |
329 | ||
330 | f = &fmt[0]; | |
331 | while (f->name != nil and not streq(f->name, s)) { | |
332 | ++f; | |
333 | } | |
334 | if (f->name == nil) { | |
335 | error("bad print format \"%s\"", s); | |
336 | } | |
337 | return f; | |
338 | } | |
339 | ||
cd6e9098 ML |
340 | public Address printdata(lowaddr, highaddr, format) |
341 | Address lowaddr; | |
342 | Address highaddr; | |
343 | String format; | |
344 | { | |
345 | register int n; | |
346 | register Address addr; | |
347 | register Format *f; | |
348 | int value; | |
349 | ||
350 | if (lowaddr > highaddr) { | |
351 | error("first address larger than second"); | |
352 | } | |
08cf9c08 | 353 | f = findformat(format); |
cd6e9098 ML |
354 | n = 0; |
355 | value = 0; | |
356 | for (addr = lowaddr; addr <= highaddr; addr += f->length) { | |
357 | if (n == 0) { | |
358 | printf("%08x: ", addr); | |
359 | } | |
360 | dread(&value, addr, f->length); | |
361 | printf(f->printfstring, value); | |
362 | ++n; | |
363 | if (n >= (16 div f->length)) { | |
364 | putchar('\n'); | |
365 | n = 0; | |
366 | } | |
367 | } | |
368 | if (n != 0) { | |
369 | putchar('\n'); | |
370 | } | |
371 | prtaddr = addr; | |
372 | return addr; | |
373 | } | |
374 | ||
375 | /* | |
376 | * The other approach is to print n items starting with a given address. | |
377 | */ | |
378 | ||
379 | public printndata(count, startaddr, format) | |
380 | int count; | |
381 | Address startaddr; | |
382 | String format; | |
383 | { | |
384 | register int i, n; | |
385 | register Address addr; | |
386 | register Format *f; | |
387 | register Boolean isstring; | |
5d8fcc0a ML |
388 | char c; |
389 | union { | |
390 | char charv; | |
391 | short shortv; | |
392 | int intv; | |
393 | float floatv; | |
394 | double doublev; | |
395 | } value; | |
cd6e9098 ML |
396 | |
397 | if (count <= 0) { | |
398 | error("non-positive repetition count"); | |
399 | } | |
08cf9c08 | 400 | f = findformat(format); |
cd6e9098 ML |
401 | isstring = (Boolean) streq(f->name, "s"); |
402 | n = 0; | |
403 | addr = startaddr; | |
5d8fcc0a | 404 | value.intv = 0; |
cd6e9098 ML |
405 | for (i = 0; i < count; i++) { |
406 | if (n == 0) { | |
407 | printf("%08x: ", addr); | |
408 | } | |
409 | if (isstring) { | |
410 | putchar('"'); | |
5d8fcc0a ML |
411 | dread(&c, addr, sizeof(char)); |
412 | while (c != '\0') { | |
413 | printchar(c); | |
cd6e9098 | 414 | ++addr; |
5d8fcc0a | 415 | dread(&c, addr, sizeof(char)); |
cd6e9098 ML |
416 | } |
417 | putchar('"'); | |
418 | putchar('\n'); | |
419 | n = 0; | |
420 | addr += sizeof(String); | |
421 | } else { | |
422 | dread(&value, addr, f->length); | |
423 | printf(f->printfstring, value); | |
424 | ++n; | |
425 | if (n >= (16 div f->length)) { | |
426 | putchar('\n'); | |
427 | n = 0; | |
428 | } | |
429 | addr += f->length; | |
430 | } | |
431 | } | |
432 | if (n != 0) { | |
433 | putchar('\n'); | |
434 | } | |
435 | prtaddr = addr; | |
436 | } | |
437 | ||
08cf9c08 ML |
438 | /* |
439 | * Print out a value according to the given format. | |
440 | */ | |
441 | ||
442 | public printvalue(v, format) | |
443 | long v; | |
444 | String format; | |
445 | { | |
446 | Format *f; | |
447 | char *p, *q; | |
448 | ||
449 | f = findformat(format); | |
450 | if (streq(f->name, "s")) { | |
451 | putchar('"'); | |
452 | p = (char *) &v; | |
453 | q = p + sizeof(v); | |
454 | while (p < q) { | |
455 | printchar(*p); | |
456 | ++p; | |
457 | } | |
458 | putchar('"'); | |
459 | } else { | |
460 | printf(f->printfstring, v); | |
461 | } | |
462 | putchar('\n'); | |
463 | } | |
464 | ||
cd6e9098 ML |
465 | /* |
466 | * Print out an execution time error. | |
8026876b | 467 | * Assumes the source position of the error has been calculated. |
cd6e9098 ML |
468 | * |
469 | * Have to check if the -r option was specified; if so then | |
470 | * the object file information hasn't been read in yet. | |
471 | */ | |
472 | ||
473 | public printerror() | |
474 | { | |
475 | extern Integer sys_nsig; | |
476 | extern String sys_siglist[]; | |
cd6e9098 ML |
477 | Integer err; |
478 | ||
479 | if (isfinished(process)) { | |
480 | printf("\"%s\" exits with code %d\n", objname, exitcode(process)); | |
481 | erecover(); | |
482 | } | |
483 | if (runfirst) { | |
484 | fprintf(stderr, "Entering debugger ..."); | |
485 | init(); | |
486 | fprintf(stderr, " type 'help' for help\n"); | |
487 | } | |
cd6e9098 ML |
488 | err = errnum(process); |
489 | if (err == SIGINT) { | |
490 | printf("\n\ninterrupt "); | |
491 | printloc(); | |
492 | } else if (err == SIGTRAP) { | |
493 | printf("\nerror "); | |
494 | printloc(); | |
495 | } else { | |
496 | if (err < 0 or err > sys_nsig) { | |
497 | printf("\nsignal %d ", err); | |
498 | } else { | |
499 | printf("\n%s ", sys_siglist[err]); | |
500 | } | |
501 | printloc(); | |
502 | } | |
503 | putchar('\n'); | |
504 | if (curline > 0) { | |
505 | printlines(curline, curline); | |
506 | } else { | |
507 | printinst(pc, pc); | |
508 | } | |
509 | erecover(); | |
510 | } | |
511 | ||
cd6e9098 ML |
512 | /* |
513 | * Note the termination of the program. We do this so as to avoid | |
514 | * having the process exit, which would make the values of variables | |
515 | * inaccessible. We do want to flush all output buffers here, | |
516 | * otherwise it'll never get done. | |
517 | */ | |
518 | ||
519 | public endprogram() | |
520 | { | |
521 | Integer exitcode; | |
522 | ||
523 | stepto(nextaddr(pc, true)); | |
524 | printnews(); | |
525 | exitcode = argn(1, nil); | |
526 | printf("\nexecution completed, exit code is %d\n", exitcode); | |
527 | getsrcpos(); | |
528 | erecover(); | |
529 | } | |
530 | ||
531 | /* | |
532 | * Single step the machine a source line (or instruction if "inst_tracing" | |
38f911d6 | 533 | * is true). If "isnext" is true, skip over procedure calls. |
cd6e9098 ML |
534 | */ |
535 | ||
536 | private Address getcall(); | |
537 | ||
538 | public dostep(isnext) | |
539 | Boolean isnext; | |
540 | { | |
541 | register Address addr; | |
542 | register Lineno line; | |
543 | String filename; | |
2fd0f574 | 544 | Address startaddr, prevaddr; |
cd6e9098 | 545 | |
2fd0f574 SL |
546 | startaddr = pc; |
547 | prevaddr = startaddr; | |
cd6e9098 | 548 | addr = nextaddr(pc, isnext); |
38f911d6 | 549 | if (not inst_tracing and nlhdr.nlines != 0) { |
cd6e9098 ML |
550 | line = linelookup(addr); |
551 | while (line == 0) { | |
2fd0f574 | 552 | prevaddr = addr; |
cd6e9098 ML |
553 | addr = nextaddr(addr, isnext); |
554 | line = linelookup(addr); | |
555 | } | |
38f911d6 ML |
556 | curline = line; |
557 | } else { | |
558 | curline = 0; | |
cd6e9098 | 559 | } |
2fd0f574 SL |
560 | if (addr == startaddr) { |
561 | stepto(prevaddr); | |
562 | } | |
cd6e9098 | 563 | stepto(addr); |
cd6e9098 ML |
564 | filename = srcfilename(addr); |
565 | setsource(filename); | |
566 | } | |
567 | ||
568 | /* | |
569 | * Compute the next address that will be executed from the given one. | |
570 | * If "isnext" is true then consider a procedure call as straight line code. | |
571 | * | |
572 | * We must unfortunately do much of the same work that is necessary | |
573 | * to print instructions. In addition we have to deal with branches. | |
574 | * Unconditional branches we just follow, for conditional branches | |
575 | * we continue execution to the current location and then single step | |
576 | * the machine. We assume that the last argument in an instruction | |
577 | * that branches is the branch address (or relative offset). | |
578 | */ | |
579 | ||
2fd0f574 SL |
580 | private Address findnextaddr(); |
581 | ||
cd6e9098 ML |
582 | public Address nextaddr(startaddr, isnext) |
583 | Address startaddr; | |
2fd0f574 SL |
584 | boolean isnext; |
585 | { | |
586 | Address addr; | |
587 | ||
588 | addr = usignal(process); | |
589 | if (addr == 0 or addr == 1) { | |
590 | addr = findnextaddr(startaddr, isnext); | |
591 | } | |
592 | return addr; | |
593 | } | |
594 | ||
595 | private Address findnextaddr(startaddr, isnext) | |
596 | Address startaddr; | |
cd6e9098 ML |
597 | Boolean isnext; |
598 | { | |
599 | register Address addr; | |
600 | Optab op; | |
601 | VaxOpcode ins; | |
602 | unsigned char mode; | |
603 | int argtype, amode, argno, argval; | |
604 | String r; | |
605 | Boolean indexf; | |
606 | enum { KNOWN, SEQUENTIAL, BRANCH } addrstatus; | |
607 | ||
608 | argval = 0; | |
609 | indexf = false; | |
610 | addr = startaddr; | |
611 | iread(&ins, addr, sizeof(ins)); | |
612 | switch (ins) { | |
613 | case O_BRB: | |
614 | case O_BRW: | |
cd6e9098 ML |
615 | addrstatus = BRANCH; |
616 | break; | |
617 | ||
618 | case O_BSBB: | |
619 | case O_BSBW: | |
620 | case O_JSB: | |
621 | case O_CALLG: | |
622 | case O_CALLS: | |
623 | if (isnext) { | |
624 | addrstatus = SEQUENTIAL; | |
625 | } else { | |
626 | addrstatus = KNOWN; | |
627 | stepto(addr); | |
2fd0f574 | 628 | pstep(process, DEFSIG); |
cd6e9098 ML |
629 | addr = reg(PROGCTR); |
630 | pc = addr; | |
2fd0f574 | 631 | setcurfunc(whatblock(pc)); |
cd6e9098 ML |
632 | if (not isbperr()) { |
633 | printstatus(); | |
eac2165c ML |
634 | /* NOTREACHED */ |
635 | } | |
636 | bpact(); | |
637 | if (nosource(curfunc) and canskip(curfunc) and | |
638 | nlhdr.nlines != 0) { | |
639 | addrstatus = KNOWN; | |
640 | addr = return_addr(); | |
641 | stepto(addr); | |
3b5f59dc | 642 | bpact(); |
cd6e9098 | 643 | } else { |
eac2165c | 644 | callnews(/* iscall = */ true); |
cd6e9098 ML |
645 | } |
646 | } | |
647 | break; | |
648 | ||
649 | case O_RSB: | |
650 | case O_RET: | |
651 | addrstatus = KNOWN; | |
652 | callnews(/* iscall = */ false); | |
653 | addr = return_addr(); | |
2fd0f574 SL |
654 | if (addr == pc) { /* recursive ret to self */ |
655 | pstep(process, DEFSIG); | |
656 | } else { | |
657 | stepto(addr); | |
658 | } | |
3b5f59dc | 659 | bpact(); |
cd6e9098 ML |
660 | break; |
661 | ||
2fd0f574 | 662 | case O_JMP: /* because it may be jmp (r1) */ |
cd6e9098 ML |
663 | case O_BNEQ: case O_BEQL: case O_BGTR: |
664 | case O_BLEQ: case O_BGEQ: case O_BLSS: | |
665 | case O_BGTRU: case O_BLEQU: case O_BVC: | |
666 | case O_BVS: case O_BCC: case O_BCS: | |
667 | case O_CASEB: case O_CASEW: case O_CASEL: | |
668 | case O_BBS: case O_BBC: case O_BBSS: case O_BBCS: | |
669 | case O_BBSC: case O_BBCC: case O_BBSSI: | |
670 | case O_BBCCI: case O_BLBS: case O_BLBC: | |
671 | case O_ACBL: case O_AOBLSS: case O_AOBLEQ: | |
672 | case O_SOBGEQ: case O_SOBGTR: | |
673 | addrstatus = KNOWN; | |
674 | stepto(addr); | |
2fd0f574 | 675 | pstep(process, DEFSIG); |
cd6e9098 ML |
676 | addr = reg(PROGCTR); |
677 | pc = addr; | |
678 | if (not isbperr()) { | |
679 | printstatus(); | |
680 | } | |
681 | break; | |
682 | ||
683 | default: | |
684 | addrstatus = SEQUENTIAL; | |
685 | break; | |
686 | } | |
687 | if (addrstatus != KNOWN) { | |
688 | addr += 1; | |
689 | op = optab[ins]; | |
690 | for (argno = 0; argno < op.numargs; argno++) { | |
691 | if (indexf == true) { | |
692 | indexf = false; | |
693 | } | |
694 | argtype = op.argtype[argno]; | |
695 | if (is_branch_disp(argtype)) { | |
696 | mode = 0xAF + (typelen(argtype) << 5); | |
697 | } else { | |
698 | iread(&mode, addr, sizeof(mode)); | |
699 | addr += 1; | |
700 | } | |
701 | r = regname[regnm(mode)]; | |
702 | amode = addrmode(mode); | |
703 | switch (amode) { | |
704 | case LITSHORT: | |
705 | case LITUPTO31: | |
706 | case LITUPTO47: | |
707 | case LITUPTO63: | |
708 | argval = mode; | |
709 | break; | |
710 | ||
711 | case INDEX: | |
712 | indexf = true; | |
713 | --argno; | |
714 | break; | |
715 | ||
716 | case REG: | |
717 | case REGDEF: | |
718 | case AUTODEC: | |
719 | break; | |
720 | ||
721 | case AUTOINC: | |
722 | if (r == regname[PROGCTR]) { | |
723 | switch (typelen(argtype)) { | |
724 | case TYPB: | |
725 | argval = getdisp(addr, 1, r, amode); | |
726 | addr += 1; | |
727 | break; | |
728 | ||
729 | case TYPW: | |
730 | argval = getdisp(addr, 2, r, amode); | |
731 | addr += 2; | |
732 | break; | |
733 | ||
734 | case TYPL: | |
735 | argval = getdisp(addr, 4, r, amode); | |
736 | addr += 4; | |
737 | break; | |
738 | ||
739 | case TYPF: | |
740 | iread(&argval, addr, sizeof(argval)); | |
741 | addr += 4; | |
742 | break; | |
743 | ||
744 | case TYPQ: | |
745 | case TYPD: | |
746 | iread(&argval, addr+4, sizeof(argval)); | |
747 | addr += 8; | |
748 | break; | |
749 | } | |
750 | } | |
751 | break; | |
752 | ||
753 | case AUTOINCDEF: | |
754 | if (r == regname[PROGCTR]) { | |
755 | argval = getdisp(addr, 4, r, amode); | |
756 | addr += 4; | |
757 | } | |
758 | break; | |
759 | ||
760 | case BYTEDISP: | |
761 | case BYTEDISPDEF: | |
762 | argval = getdisp(addr, 1, r, amode); | |
763 | addr += 1; | |
764 | break; | |
765 | ||
766 | case WORDDISP: | |
767 | case WORDDISPDEF: | |
768 | argval = getdisp(addr, 2, r, amode); | |
769 | addr += 2; | |
770 | break; | |
771 | ||
772 | case LONGDISP: | |
773 | case LONGDISPDEF: | |
774 | argval = getdisp(addr, 4, r, amode); | |
775 | addr += 4; | |
776 | break; | |
777 | } | |
778 | } | |
779 | if (ins == O_CALLS or ins == O_CALLG) { | |
780 | argval += 2; | |
781 | } | |
782 | if (addrstatus == BRANCH) { | |
783 | addr = argval; | |
784 | } | |
785 | } | |
786 | return addr; | |
787 | } | |
788 | ||
789 | /* | |
790 | * Get the displacement of an instruction that uses displacement addressing. | |
791 | */ | |
792 | ||
793 | private int getdisp(addr, nbytes, reg, mode) | |
794 | Address addr; | |
795 | int nbytes; | |
796 | String reg; | |
797 | int mode; | |
798 | { | |
799 | char byte; | |
800 | short hword; | |
801 | int argval; | |
802 | ||
803 | switch (nbytes) { | |
804 | case 1: | |
805 | iread(&byte, addr, sizeof(byte)); | |
806 | argval = byte; | |
807 | break; | |
808 | ||
809 | case 2: | |
810 | iread(&hword, addr, sizeof(hword)); | |
811 | argval = hword; | |
812 | break; | |
813 | ||
814 | case 4: | |
815 | iread(&argval, addr, sizeof(argval)); | |
816 | break; | |
817 | } | |
818 | if (reg == regname[PROGCTR] && mode >= BYTEDISP) { | |
819 | argval += addr + nbytes; | |
820 | } | |
821 | return argval; | |
822 | } | |
823 | ||
824 | #define BP_OP O_BPT /* breakpoint trap */ | |
825 | #define BP_ERRNO SIGTRAP /* signal received at a breakpoint */ | |
826 | ||
827 | /* | |
828 | * Setting a breakpoint at a location consists of saving | |
829 | * the word at the location and poking a BP_OP there. | |
830 | * | |
831 | * We save the locations and words on a list for use in unsetting. | |
832 | */ | |
833 | ||
834 | typedef struct Savelist *Savelist; | |
835 | ||
836 | struct Savelist { | |
837 | Address location; | |
838 | Byte save; | |
839 | Byte refcount; | |
840 | Savelist link; | |
841 | }; | |
842 | ||
843 | private Savelist savelist; | |
844 | ||
845 | /* | |
846 | * Set a breakpoint at the given address. Only save the word there | |
847 | * if it's not already a breakpoint. | |
848 | */ | |
849 | ||
850 | public setbp(addr) | |
851 | Address addr; | |
852 | { | |
853 | Byte w; | |
854 | Byte save; | |
855 | register Savelist newsave, s; | |
856 | ||
857 | for (s = savelist; s != nil; s = s->link) { | |
858 | if (s->location == addr) { | |
859 | s->refcount++; | |
860 | return; | |
861 | } | |
862 | } | |
08cf9c08 | 863 | iread(&save, addr, sizeof(save)); |
cd6e9098 ML |
864 | newsave = new(Savelist); |
865 | newsave->location = addr; | |
866 | newsave->save = save; | |
867 | newsave->refcount = 1; | |
868 | newsave->link = savelist; | |
869 | savelist = newsave; | |
870 | w = BP_OP; | |
871 | iwrite(&w, addr, sizeof(w)); | |
872 | } | |
873 | ||
874 | /* | |
875 | * Unset a breakpoint; unfortunately we have to search the SAVELIST | |
876 | * to find the saved value. The assumption is that the SAVELIST will | |
877 | * usually be quite small. | |
878 | */ | |
879 | ||
880 | public unsetbp(addr) | |
881 | Address addr; | |
882 | { | |
883 | register Savelist s, prev; | |
884 | ||
885 | prev = nil; | |
886 | for (s = savelist; s != nil; s = s->link) { | |
887 | if (s->location == addr) { | |
888 | iwrite(&s->save, addr, sizeof(s->save)); | |
889 | s->refcount--; | |
890 | if (s->refcount == 0) { | |
891 | if (prev == nil) { | |
892 | savelist = s->link; | |
893 | } else { | |
894 | prev->link = s->link; | |
895 | } | |
896 | dispose(s); | |
897 | } | |
898 | return; | |
899 | } | |
900 | prev = s; | |
901 | } | |
902 | panic("unsetbp: couldn't find address %d", addr); | |
903 | } | |
904 | ||
905 | /* | |
906 | * Predicate to test if the reason the process stopped was because | |
907 | * of a breakpoint. | |
908 | */ | |
909 | ||
910 | public Boolean isbperr() | |
911 | { | |
912 | return (Boolean) (not isfinished(process) and errnum(process) == SIGTRAP); | |
913 | } | |
914 | ||
915 | /* | |
916 | * Enter a procedure by creating and executing a call instruction. | |
917 | */ | |
918 | ||
919 | #define CALLSIZE 7 /* size of call instruction */ | |
920 | ||
921 | public beginproc(p, argc) | |
922 | Symbol p; | |
923 | Integer argc; | |
924 | { | |
925 | char save[CALLSIZE]; | |
926 | struct { | |
927 | VaxOpcode op; | |
928 | unsigned char numargs; | |
929 | unsigned char mode; | |
930 | char addr[sizeof(long)]; /* unaligned long */ | |
931 | } call; | |
932 | long dest; | |
933 | ||
934 | pc = 2; | |
935 | iread(save, pc, sizeof(save)); | |
936 | call.op = O_CALLS; | |
937 | call.numargs = argc; | |
938 | call.mode = 0xef; | |
939 | dest = codeloc(p) - 2 - (pc + 7); | |
940 | mov(&dest, call.addr, sizeof(call.addr)); | |
941 | iwrite(&call, pc, sizeof(call)); | |
942 | setreg(PROGCTR, pc); | |
2fd0f574 | 943 | pstep(process, DEFSIG); |
cd6e9098 ML |
944 | iwrite(save, pc, sizeof(save)); |
945 | pc = reg(PROGCTR); | |
946 | if (not isbperr()) { | |
947 | printstatus(); | |
948 | } | |
949 | } |