Commit | Line | Data |
---|---|---|
cd6e9098 ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
e1f4dbca | 3 | static char sccsid[] = "@(#)vax.c 1.10 (Berkeley) %G%"; |
cd6e9098 ML |
4 | |
5 | /* | |
6 | * Target machine dependent stuff. | |
7 | */ | |
8 | ||
9 | #include "defs.h" | |
10 | #include "machine.h" | |
11 | #include "process.h" | |
2fd0f574 | 12 | #include "runtime.h" |
cd6e9098 ML |
13 | #include "events.h" |
14 | #include "main.h" | |
15 | #include "symbols.h" | |
16 | #include "source.h" | |
17 | #include "mappings.h" | |
18 | #include "object.h" | |
9882bead | 19 | #include "ops.h" |
cd6e9098 ML |
20 | #include <signal.h> |
21 | ||
22 | #ifndef public | |
23 | typedef unsigned int Address; | |
24 | typedef unsigned char Byte; | |
25 | typedef unsigned int Word; | |
26 | ||
27 | #define NREG 16 | |
28 | ||
29 | #define ARGP 12 | |
30 | #define FRP 13 | |
31 | #define STKP 14 | |
32 | #define PROGCTR 15 | |
33 | ||
34 | #define BITSPERBYTE 8 | |
35 | #define BITSPERWORD (BITSPERBYTE * sizeof(Word)) | |
36 | ||
37 | #define nargspassed(frame) argn(0, frame) | |
38 | ||
39 | #include "source.h" | |
40 | #include "symbols.h" | |
41 | ||
42 | Address pc; | |
43 | Address prtaddr; | |
44 | ||
45 | #endif | |
46 | ||
47 | private Address printop(); | |
48 | ||
49 | /* | |
50 | * Decode and print the instructions within the given address range. | |
51 | */ | |
52 | ||
53 | public printinst(lowaddr, highaddr) | |
54 | Address lowaddr; | |
55 | Address highaddr; | |
56 | { | |
57 | register Address addr; | |
58 | ||
59 | for (addr = lowaddr; addr <= highaddr; ) { | |
60 | addr = printop(addr); | |
61 | } | |
62 | prtaddr = addr; | |
63 | } | |
64 | ||
65 | /* | |
66 | * Another approach: print n instructions starting at the given address. | |
67 | */ | |
68 | ||
69 | public printninst(count, addr) | |
70 | int count; | |
71 | Address addr; | |
72 | { | |
73 | register Integer i; | |
74 | register Address newaddr; | |
75 | ||
76 | if (count <= 0) { | |
77 | error("non-positive repetition count"); | |
78 | } else { | |
79 | newaddr = addr; | |
80 | for (i = 0; i < count; i++) { | |
81 | newaddr = printop(newaddr); | |
82 | } | |
83 | prtaddr = newaddr; | |
84 | } | |
85 | } | |
86 | ||
87 | /* | |
88 | * Hacked version of adb's VAX instruction decoder. | |
89 | */ | |
90 | ||
91 | private Address printop(addr) | |
92 | Address addr; | |
93 | { | |
94 | Optab op; | |
95 | VaxOpcode ins; | |
96 | unsigned char mode; | |
97 | int argtype, amode, argno, argval; | |
98 | String reg; | |
99 | Boolean indexf; | |
100 | short offset; | |
101 | ||
102 | argval = 0; | |
103 | indexf = false; | |
104 | printf("%08x ", addr); | |
105 | iread(&ins, addr, sizeof(ins)); | |
106 | addr += 1; | |
107 | op = optab[ins]; | |
108 | printf("%s", op.iname); | |
109 | for (argno = 0; argno < op.numargs; argno++) { | |
110 | if (indexf == true) { | |
111 | indexf = false; | |
112 | } else if (argno == 0) { | |
113 | printf("\t"); | |
114 | } else { | |
115 | printf(","); | |
116 | } | |
117 | argtype = op.argtype[argno]; | |
118 | if (is_branch_disp(argtype)) { | |
119 | mode = 0xAF + (typelen(argtype) << 5); | |
120 | } else { | |
121 | iread(&mode, addr, sizeof(mode)); | |
122 | addr += 1; | |
123 | } | |
124 | reg = regname[regnm(mode)]; | |
125 | amode = addrmode(mode); | |
126 | switch (amode) { | |
127 | case LITSHORT: | |
128 | case LITUPTO31: | |
129 | case LITUPTO47: | |
130 | case LITUPTO63: | |
131 | if (typelen(argtype) == TYPF || typelen(argtype) ==TYPD) | |
132 | printf("$%s", fltimm[mode]); | |
133 | else | |
134 | printf("$%x", mode); | |
135 | argval = mode; | |
136 | break; | |
137 | ||
138 | case INDEX: | |
139 | printf("[%s]", reg); | |
140 | indexf = true; | |
141 | argno--; | |
142 | break; | |
143 | ||
144 | case REG: | |
145 | printf("%s", reg); | |
146 | break; | |
147 | ||
148 | case REGDEF: | |
149 | printf("(%s)", reg); | |
150 | break; | |
151 | ||
152 | case AUTODEC: | |
153 | printf("-(%s)", reg); | |
154 | break; | |
155 | ||
156 | case AUTOINC: | |
157 | if (reg != regname[PROGCTR]) { | |
158 | printf("(%s)+", reg); | |
159 | } else { | |
160 | printf("$"); | |
161 | switch (typelen(argtype)) { | |
162 | case TYPB: | |
163 | argval = printdisp(addr, 1, reg, amode); | |
164 | addr += 1; | |
165 | break; | |
166 | ||
167 | case TYPW: | |
168 | argval = printdisp(addr, 2, reg, amode); | |
169 | addr += 2; | |
170 | break; | |
171 | ||
172 | case TYPL: | |
173 | argval = printdisp(addr, 4, reg, amode); | |
174 | addr += 4; | |
175 | break; | |
176 | ||
177 | case TYPF: | |
178 | iread(&argval, addr, sizeof(argval)); | |
179 | printf("%06x", argval); | |
180 | addr += 4; | |
181 | break; | |
182 | ||
183 | case TYPQ: | |
184 | case TYPD: | |
185 | iread(&argval, addr, sizeof(argval)); | |
186 | printf("%06x", argval); | |
187 | iread(&argval, addr+4, sizeof(argval)); | |
188 | printf("%06x", argval); | |
189 | addr += 8; | |
190 | break; | |
191 | } | |
192 | } | |
193 | break; | |
194 | ||
195 | case AUTOINCDEF: | |
196 | if (reg == regname[PROGCTR]) { | |
197 | printf("*$"); | |
198 | argval = printdisp(addr, 4, reg, amode); | |
199 | addr += 4; | |
200 | } else { | |
201 | printf("*(%s)+", reg); | |
202 | } | |
203 | break; | |
204 | ||
205 | case BYTEDISP: | |
206 | argval = printdisp(addr, 1, reg, amode); | |
207 | addr += 1; | |
208 | break; | |
209 | ||
210 | case BYTEDISPDEF: | |
211 | printf("*"); | |
212 | argval = printdisp(addr, 1, reg, amode); | |
213 | addr += 1; | |
214 | break; | |
215 | ||
216 | case WORDDISP: | |
217 | argval = printdisp(addr, 2, reg, amode); | |
218 | addr += 2; | |
219 | break; | |
220 | ||
221 | case WORDDISPDEF: | |
222 | printf("*"); | |
223 | argval = printdisp(addr, 2, reg, amode); | |
224 | addr += 2; | |
225 | break; | |
226 | ||
227 | case LONGDISP: | |
228 | argval = printdisp(addr, 4, reg, amode); | |
229 | addr += 4; | |
230 | break; | |
231 | ||
232 | case LONGDISPDEF: | |
233 | printf("*"); | |
234 | argval = printdisp(addr, 4, reg, amode); | |
235 | addr += 4; | |
236 | break; | |
237 | } | |
238 | } | |
239 | if (ins == O_CASEB || ins == O_CASEW || ins == O_CASEL) { | |
240 | for (argno = 0; argno <= argval; argno++) { | |
241 | iread(&offset, addr, sizeof(offset)); | |
242 | printf("\n\t\t%d", offset); | |
243 | addr += 2; | |
244 | } | |
245 | } | |
246 | printf("\n"); | |
247 | return addr; | |
248 | } | |
249 | ||
250 | /* | |
251 | * Print the displacement of an instruction that uses displacement | |
252 | * addressing. | |
253 | */ | |
254 | ||
255 | private int printdisp(addr, nbytes, reg, mode) | |
256 | Address addr; | |
257 | int nbytes; | |
258 | char *reg; | |
259 | int mode; | |
260 | { | |
261 | char byte; | |
262 | short hword; | |
263 | int argval; | |
5d8fcc0a | 264 | Symbol f; |
cd6e9098 ML |
265 | |
266 | switch (nbytes) { | |
267 | case 1: | |
268 | iread(&byte, addr, sizeof(byte)); | |
269 | argval = byte; | |
270 | break; | |
271 | ||
272 | case 2: | |
273 | iread(&hword, addr, sizeof(hword)); | |
274 | argval = hword; | |
275 | break; | |
276 | ||
277 | case 4: | |
278 | iread(&argval, addr, sizeof(argval)); | |
279 | break; | |
280 | } | |
281 | if (reg == regname[PROGCTR] && mode >= BYTEDISP) { | |
282 | argval += addr + nbytes; | |
283 | } | |
284 | if (reg == regname[PROGCTR]) { | |
5d8fcc0a ML |
285 | f = whatblock((Address) argval + 2); |
286 | if (codeloc(f) == argval + 2) { | |
287 | printf("%s", symname(f)); | |
288 | } else { | |
289 | printf("%x", argval); | |
290 | } | |
cd6e9098 ML |
291 | } else { |
292 | printf("%d(%s)", argval, reg); | |
293 | } | |
294 | return argval; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Print the contents of the addresses within the given range | |
299 | * according to the given format. | |
300 | */ | |
301 | ||
302 | typedef struct { | |
303 | String name; | |
304 | String printfstring; | |
305 | int length; | |
306 | } Format; | |
307 | ||
308 | private Format fmt[] = { | |
309 | { "d", " %d", sizeof(short) }, | |
310 | { "D", " %ld", sizeof(long) }, | |
311 | { "o", " %o", sizeof(short) }, | |
312 | { "O", " %lo", sizeof(long) }, | |
313 | { "x", " %04x", sizeof(short) }, | |
314 | { "X", " %08x", sizeof(long) }, | |
315 | { "b", " \\%o", sizeof(char) }, | |
316 | { "c", " '%c'", sizeof(char) }, | |
317 | { "s", "%c", sizeof(char) }, | |
5d8fcc0a | 318 | { "f", " %f", sizeof(float) }, |
cd6e9098 ML |
319 | { "g", " %g", sizeof(double) }, |
320 | { nil, nil, 0 } | |
321 | }; | |
322 | ||
08cf9c08 ML |
323 | private Format *findformat(s) |
324 | String s; | |
325 | { | |
326 | register Format *f; | |
327 | ||
328 | f = &fmt[0]; | |
329 | while (f->name != nil and not streq(f->name, s)) { | |
330 | ++f; | |
331 | } | |
332 | if (f->name == nil) { | |
333 | error("bad print format \"%s\"", s); | |
334 | } | |
335 | return f; | |
336 | } | |
337 | ||
cd6e9098 ML |
338 | public Address printdata(lowaddr, highaddr, format) |
339 | Address lowaddr; | |
340 | Address highaddr; | |
341 | String format; | |
342 | { | |
343 | register int n; | |
344 | register Address addr; | |
345 | register Format *f; | |
346 | int value; | |
347 | ||
348 | if (lowaddr > highaddr) { | |
349 | error("first address larger than second"); | |
350 | } | |
08cf9c08 | 351 | f = findformat(format); |
cd6e9098 ML |
352 | n = 0; |
353 | value = 0; | |
354 | for (addr = lowaddr; addr <= highaddr; addr += f->length) { | |
355 | if (n == 0) { | |
356 | printf("%08x: ", addr); | |
357 | } | |
358 | dread(&value, addr, f->length); | |
359 | printf(f->printfstring, value); | |
360 | ++n; | |
361 | if (n >= (16 div f->length)) { | |
362 | putchar('\n'); | |
363 | n = 0; | |
364 | } | |
365 | } | |
366 | if (n != 0) { | |
367 | putchar('\n'); | |
368 | } | |
369 | prtaddr = addr; | |
370 | return addr; | |
371 | } | |
372 | ||
373 | /* | |
374 | * The other approach is to print n items starting with a given address. | |
375 | */ | |
376 | ||
377 | public printndata(count, startaddr, format) | |
378 | int count; | |
379 | Address startaddr; | |
380 | String format; | |
381 | { | |
382 | register int i, n; | |
383 | register Address addr; | |
384 | register Format *f; | |
385 | register Boolean isstring; | |
5d8fcc0a ML |
386 | char c; |
387 | union { | |
388 | char charv; | |
389 | short shortv; | |
390 | int intv; | |
391 | float floatv; | |
392 | double doublev; | |
393 | } value; | |
cd6e9098 ML |
394 | |
395 | if (count <= 0) { | |
396 | error("non-positive repetition count"); | |
397 | } | |
08cf9c08 | 398 | f = findformat(format); |
cd6e9098 ML |
399 | isstring = (Boolean) streq(f->name, "s"); |
400 | n = 0; | |
401 | addr = startaddr; | |
5d8fcc0a | 402 | value.intv = 0; |
cd6e9098 ML |
403 | for (i = 0; i < count; i++) { |
404 | if (n == 0) { | |
405 | printf("%08x: ", addr); | |
406 | } | |
407 | if (isstring) { | |
408 | putchar('"'); | |
5d8fcc0a ML |
409 | dread(&c, addr, sizeof(char)); |
410 | while (c != '\0') { | |
411 | printchar(c); | |
cd6e9098 | 412 | ++addr; |
5d8fcc0a | 413 | dread(&c, addr, sizeof(char)); |
cd6e9098 ML |
414 | } |
415 | putchar('"'); | |
416 | putchar('\n'); | |
417 | n = 0; | |
418 | addr += sizeof(String); | |
419 | } else { | |
420 | dread(&value, addr, f->length); | |
421 | printf(f->printfstring, value); | |
422 | ++n; | |
423 | if (n >= (16 div f->length)) { | |
424 | putchar('\n'); | |
425 | n = 0; | |
426 | } | |
427 | addr += f->length; | |
428 | } | |
429 | } | |
430 | if (n != 0) { | |
431 | putchar('\n'); | |
432 | } | |
433 | prtaddr = addr; | |
434 | } | |
435 | ||
08cf9c08 ML |
436 | /* |
437 | * Print out a value according to the given format. | |
438 | */ | |
439 | ||
440 | public printvalue(v, format) | |
441 | long v; | |
442 | String format; | |
443 | { | |
444 | Format *f; | |
445 | char *p, *q; | |
446 | ||
447 | f = findformat(format); | |
448 | if (streq(f->name, "s")) { | |
449 | putchar('"'); | |
450 | p = (char *) &v; | |
451 | q = p + sizeof(v); | |
452 | while (p < q) { | |
453 | printchar(*p); | |
454 | ++p; | |
455 | } | |
456 | putchar('"'); | |
457 | } else { | |
458 | printf(f->printfstring, v); | |
459 | } | |
460 | putchar('\n'); | |
461 | } | |
462 | ||
cd6e9098 ML |
463 | /* |
464 | * Print out an execution time error. | |
8026876b | 465 | * Assumes the source position of the error has been calculated. |
cd6e9098 ML |
466 | * |
467 | * Have to check if the -r option was specified; if so then | |
468 | * the object file information hasn't been read in yet. | |
469 | */ | |
470 | ||
471 | public printerror() | |
472 | { | |
473 | extern Integer sys_nsig; | |
474 | extern String sys_siglist[]; | |
cd6e9098 ML |
475 | Integer err; |
476 | ||
477 | if (isfinished(process)) { | |
478 | printf("\"%s\" exits with code %d\n", objname, exitcode(process)); | |
479 | erecover(); | |
480 | } | |
481 | if (runfirst) { | |
482 | fprintf(stderr, "Entering debugger ..."); | |
483 | init(); | |
484 | fprintf(stderr, " type 'help' for help\n"); | |
485 | } | |
cd6e9098 ML |
486 | err = errnum(process); |
487 | if (err == SIGINT) { | |
488 | printf("\n\ninterrupt "); | |
489 | printloc(); | |
490 | } else if (err == SIGTRAP) { | |
491 | printf("\nerror "); | |
492 | printloc(); | |
493 | } else { | |
494 | if (err < 0 or err > sys_nsig) { | |
495 | printf("\nsignal %d ", err); | |
496 | } else { | |
497 | printf("\n%s ", sys_siglist[err]); | |
498 | } | |
499 | printloc(); | |
500 | } | |
501 | putchar('\n'); | |
502 | if (curline > 0) { | |
503 | printlines(curline, curline); | |
504 | } else { | |
505 | printinst(pc, pc); | |
506 | } | |
507 | erecover(); | |
508 | } | |
509 | ||
cd6e9098 ML |
510 | /* |
511 | * Note the termination of the program. We do this so as to avoid | |
512 | * having the process exit, which would make the values of variables | |
513 | * inaccessible. We do want to flush all output buffers here, | |
514 | * otherwise it'll never get done. | |
515 | */ | |
516 | ||
517 | public endprogram() | |
518 | { | |
519 | Integer exitcode; | |
520 | ||
521 | stepto(nextaddr(pc, true)); | |
522 | printnews(); | |
523 | exitcode = argn(1, nil); | |
524 | printf("\nexecution completed, exit code is %d\n", exitcode); | |
525 | getsrcpos(); | |
526 | erecover(); | |
527 | } | |
528 | ||
529 | /* | |
530 | * Single step the machine a source line (or instruction if "inst_tracing" | |
38f911d6 | 531 | * is true). If "isnext" is true, skip over procedure calls. |
cd6e9098 ML |
532 | */ |
533 | ||
534 | private Address getcall(); | |
535 | ||
536 | public dostep(isnext) | |
537 | Boolean isnext; | |
538 | { | |
539 | register Address addr; | |
540 | register Lineno line; | |
541 | String filename; | |
2fd0f574 | 542 | Address startaddr, prevaddr; |
cd6e9098 | 543 | |
2fd0f574 SL |
544 | startaddr = pc; |
545 | prevaddr = startaddr; | |
cd6e9098 | 546 | addr = nextaddr(pc, isnext); |
38f911d6 | 547 | if (not inst_tracing and nlhdr.nlines != 0) { |
cd6e9098 ML |
548 | line = linelookup(addr); |
549 | while (line == 0) { | |
2fd0f574 | 550 | prevaddr = addr; |
cd6e9098 ML |
551 | addr = nextaddr(addr, isnext); |
552 | line = linelookup(addr); | |
553 | } | |
38f911d6 ML |
554 | curline = line; |
555 | } else { | |
556 | curline = 0; | |
cd6e9098 | 557 | } |
2fd0f574 SL |
558 | if (addr == startaddr) { |
559 | stepto(prevaddr); | |
560 | } | |
cd6e9098 | 561 | stepto(addr); |
cd6e9098 ML |
562 | filename = srcfilename(addr); |
563 | setsource(filename); | |
564 | } | |
565 | ||
566 | /* | |
567 | * Compute the next address that will be executed from the given one. | |
568 | * If "isnext" is true then consider a procedure call as straight line code. | |
569 | * | |
570 | * We must unfortunately do much of the same work that is necessary | |
571 | * to print instructions. In addition we have to deal with branches. | |
572 | * Unconditional branches we just follow, for conditional branches | |
573 | * we continue execution to the current location and then single step | |
574 | * the machine. We assume that the last argument in an instruction | |
575 | * that branches is the branch address (or relative offset). | |
576 | */ | |
577 | ||
2fd0f574 SL |
578 | private Address findnextaddr(); |
579 | ||
cd6e9098 ML |
580 | public Address nextaddr(startaddr, isnext) |
581 | Address startaddr; | |
2fd0f574 SL |
582 | boolean isnext; |
583 | { | |
584 | Address addr; | |
585 | ||
586 | addr = usignal(process); | |
587 | if (addr == 0 or addr == 1) { | |
588 | addr = findnextaddr(startaddr, isnext); | |
589 | } | |
590 | return addr; | |
591 | } | |
592 | ||
593 | private Address findnextaddr(startaddr, isnext) | |
594 | Address startaddr; | |
cd6e9098 ML |
595 | Boolean isnext; |
596 | { | |
597 | register Address addr; | |
598 | Optab op; | |
599 | VaxOpcode ins; | |
600 | unsigned char mode; | |
601 | int argtype, amode, argno, argval; | |
602 | String r; | |
603 | Boolean indexf; | |
604 | enum { KNOWN, SEQUENTIAL, BRANCH } addrstatus; | |
605 | ||
606 | argval = 0; | |
607 | indexf = false; | |
608 | addr = startaddr; | |
609 | iread(&ins, addr, sizeof(ins)); | |
610 | switch (ins) { | |
611 | case O_BRB: | |
612 | case O_BRW: | |
cd6e9098 ML |
613 | addrstatus = BRANCH; |
614 | break; | |
615 | ||
616 | case O_BSBB: | |
617 | case O_BSBW: | |
618 | case O_JSB: | |
619 | case O_CALLG: | |
620 | case O_CALLS: | |
621 | if (isnext) { | |
622 | addrstatus = SEQUENTIAL; | |
623 | } else { | |
624 | addrstatus = KNOWN; | |
625 | stepto(addr); | |
2fd0f574 | 626 | pstep(process, DEFSIG); |
cd6e9098 ML |
627 | addr = reg(PROGCTR); |
628 | pc = addr; | |
2fd0f574 | 629 | setcurfunc(whatblock(pc)); |
cd6e9098 ML |
630 | if (not isbperr()) { |
631 | printstatus(); | |
eac2165c ML |
632 | /* NOTREACHED */ |
633 | } | |
634 | bpact(); | |
635 | if (nosource(curfunc) and canskip(curfunc) and | |
636 | nlhdr.nlines != 0) { | |
637 | addrstatus = KNOWN; | |
638 | addr = return_addr(); | |
639 | stepto(addr); | |
3b5f59dc | 640 | bpact(); |
cd6e9098 | 641 | } else { |
eac2165c | 642 | callnews(/* iscall = */ true); |
cd6e9098 ML |
643 | } |
644 | } | |
645 | break; | |
646 | ||
647 | case O_RSB: | |
648 | case O_RET: | |
649 | addrstatus = KNOWN; | |
650 | callnews(/* iscall = */ false); | |
651 | addr = return_addr(); | |
2fd0f574 SL |
652 | if (addr == pc) { /* recursive ret to self */ |
653 | pstep(process, DEFSIG); | |
654 | } else { | |
655 | stepto(addr); | |
656 | } | |
3b5f59dc | 657 | bpact(); |
cd6e9098 ML |
658 | break; |
659 | ||
2fd0f574 | 660 | case O_JMP: /* because it may be jmp (r1) */ |
cd6e9098 ML |
661 | case O_BNEQ: case O_BEQL: case O_BGTR: |
662 | case O_BLEQ: case O_BGEQ: case O_BLSS: | |
663 | case O_BGTRU: case O_BLEQU: case O_BVC: | |
664 | case O_BVS: case O_BCC: case O_BCS: | |
665 | case O_CASEB: case O_CASEW: case O_CASEL: | |
666 | case O_BBS: case O_BBC: case O_BBSS: case O_BBCS: | |
667 | case O_BBSC: case O_BBCC: case O_BBSSI: | |
668 | case O_BBCCI: case O_BLBS: case O_BLBC: | |
669 | case O_ACBL: case O_AOBLSS: case O_AOBLEQ: | |
670 | case O_SOBGEQ: case O_SOBGTR: | |
671 | addrstatus = KNOWN; | |
672 | stepto(addr); | |
2fd0f574 | 673 | pstep(process, DEFSIG); |
cd6e9098 ML |
674 | addr = reg(PROGCTR); |
675 | pc = addr; | |
676 | if (not isbperr()) { | |
677 | printstatus(); | |
678 | } | |
679 | break; | |
680 | ||
681 | default: | |
682 | addrstatus = SEQUENTIAL; | |
683 | break; | |
684 | } | |
685 | if (addrstatus != KNOWN) { | |
686 | addr += 1; | |
687 | op = optab[ins]; | |
688 | for (argno = 0; argno < op.numargs; argno++) { | |
689 | if (indexf == true) { | |
690 | indexf = false; | |
691 | } | |
692 | argtype = op.argtype[argno]; | |
693 | if (is_branch_disp(argtype)) { | |
694 | mode = 0xAF + (typelen(argtype) << 5); | |
695 | } else { | |
696 | iread(&mode, addr, sizeof(mode)); | |
697 | addr += 1; | |
698 | } | |
699 | r = regname[regnm(mode)]; | |
700 | amode = addrmode(mode); | |
701 | switch (amode) { | |
702 | case LITSHORT: | |
703 | case LITUPTO31: | |
704 | case LITUPTO47: | |
705 | case LITUPTO63: | |
706 | argval = mode; | |
707 | break; | |
708 | ||
709 | case INDEX: | |
710 | indexf = true; | |
711 | --argno; | |
712 | break; | |
713 | ||
714 | case REG: | |
715 | case REGDEF: | |
716 | case AUTODEC: | |
717 | break; | |
718 | ||
719 | case AUTOINC: | |
720 | if (r == regname[PROGCTR]) { | |
721 | switch (typelen(argtype)) { | |
722 | case TYPB: | |
723 | argval = getdisp(addr, 1, r, amode); | |
724 | addr += 1; | |
725 | break; | |
726 | ||
727 | case TYPW: | |
728 | argval = getdisp(addr, 2, r, amode); | |
729 | addr += 2; | |
730 | break; | |
731 | ||
732 | case TYPL: | |
733 | argval = getdisp(addr, 4, r, amode); | |
734 | addr += 4; | |
735 | break; | |
736 | ||
737 | case TYPF: | |
738 | iread(&argval, addr, sizeof(argval)); | |
739 | addr += 4; | |
740 | break; | |
741 | ||
742 | case TYPQ: | |
743 | case TYPD: | |
744 | iread(&argval, addr+4, sizeof(argval)); | |
745 | addr += 8; | |
746 | break; | |
747 | } | |
748 | } | |
749 | break; | |
750 | ||
751 | case AUTOINCDEF: | |
752 | if (r == regname[PROGCTR]) { | |
753 | argval = getdisp(addr, 4, r, amode); | |
754 | addr += 4; | |
755 | } | |
756 | break; | |
757 | ||
758 | case BYTEDISP: | |
759 | case BYTEDISPDEF: | |
760 | argval = getdisp(addr, 1, r, amode); | |
761 | addr += 1; | |
762 | break; | |
763 | ||
764 | case WORDDISP: | |
765 | case WORDDISPDEF: | |
766 | argval = getdisp(addr, 2, r, amode); | |
767 | addr += 2; | |
768 | break; | |
769 | ||
770 | case LONGDISP: | |
771 | case LONGDISPDEF: | |
772 | argval = getdisp(addr, 4, r, amode); | |
773 | addr += 4; | |
774 | break; | |
775 | } | |
776 | } | |
777 | if (ins == O_CALLS or ins == O_CALLG) { | |
778 | argval += 2; | |
779 | } | |
780 | if (addrstatus == BRANCH) { | |
781 | addr = argval; | |
782 | } | |
783 | } | |
784 | return addr; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Get the displacement of an instruction that uses displacement addressing. | |
789 | */ | |
790 | ||
791 | private int getdisp(addr, nbytes, reg, mode) | |
792 | Address addr; | |
793 | int nbytes; | |
794 | String reg; | |
795 | int mode; | |
796 | { | |
797 | char byte; | |
798 | short hword; | |
799 | int argval; | |
800 | ||
801 | switch (nbytes) { | |
802 | case 1: | |
803 | iread(&byte, addr, sizeof(byte)); | |
804 | argval = byte; | |
805 | break; | |
806 | ||
807 | case 2: | |
808 | iread(&hword, addr, sizeof(hword)); | |
809 | argval = hword; | |
810 | break; | |
811 | ||
812 | case 4: | |
813 | iread(&argval, addr, sizeof(argval)); | |
814 | break; | |
815 | } | |
816 | if (reg == regname[PROGCTR] && mode >= BYTEDISP) { | |
817 | argval += addr + nbytes; | |
818 | } | |
819 | return argval; | |
820 | } | |
821 | ||
822 | #define BP_OP O_BPT /* breakpoint trap */ | |
823 | #define BP_ERRNO SIGTRAP /* signal received at a breakpoint */ | |
824 | ||
825 | /* | |
826 | * Setting a breakpoint at a location consists of saving | |
827 | * the word at the location and poking a BP_OP there. | |
828 | * | |
829 | * We save the locations and words on a list for use in unsetting. | |
830 | */ | |
831 | ||
832 | typedef struct Savelist *Savelist; | |
833 | ||
834 | struct Savelist { | |
835 | Address location; | |
836 | Byte save; | |
837 | Byte refcount; | |
838 | Savelist link; | |
839 | }; | |
840 | ||
841 | private Savelist savelist; | |
842 | ||
843 | /* | |
844 | * Set a breakpoint at the given address. Only save the word there | |
845 | * if it's not already a breakpoint. | |
846 | */ | |
847 | ||
848 | public setbp(addr) | |
849 | Address addr; | |
850 | { | |
851 | Byte w; | |
852 | Byte save; | |
853 | register Savelist newsave, s; | |
854 | ||
855 | for (s = savelist; s != nil; s = s->link) { | |
856 | if (s->location == addr) { | |
857 | s->refcount++; | |
858 | return; | |
859 | } | |
860 | } | |
08cf9c08 | 861 | iread(&save, addr, sizeof(save)); |
cd6e9098 ML |
862 | newsave = new(Savelist); |
863 | newsave->location = addr; | |
864 | newsave->save = save; | |
865 | newsave->refcount = 1; | |
866 | newsave->link = savelist; | |
867 | savelist = newsave; | |
868 | w = BP_OP; | |
869 | iwrite(&w, addr, sizeof(w)); | |
870 | } | |
871 | ||
872 | /* | |
873 | * Unset a breakpoint; unfortunately we have to search the SAVELIST | |
874 | * to find the saved value. The assumption is that the SAVELIST will | |
875 | * usually be quite small. | |
876 | */ | |
877 | ||
878 | public unsetbp(addr) | |
879 | Address addr; | |
880 | { | |
881 | register Savelist s, prev; | |
882 | ||
883 | prev = nil; | |
884 | for (s = savelist; s != nil; s = s->link) { | |
885 | if (s->location == addr) { | |
886 | iwrite(&s->save, addr, sizeof(s->save)); | |
887 | s->refcount--; | |
888 | if (s->refcount == 0) { | |
889 | if (prev == nil) { | |
890 | savelist = s->link; | |
891 | } else { | |
892 | prev->link = s->link; | |
893 | } | |
894 | dispose(s); | |
895 | } | |
896 | return; | |
897 | } | |
898 | prev = s; | |
899 | } | |
900 | panic("unsetbp: couldn't find address %d", addr); | |
901 | } | |
902 | ||
903 | /* | |
904 | * Predicate to test if the reason the process stopped was because | |
905 | * of a breakpoint. | |
906 | */ | |
907 | ||
908 | public Boolean isbperr() | |
909 | { | |
910 | return (Boolean) (not isfinished(process) and errnum(process) == SIGTRAP); | |
911 | } | |
912 | ||
913 | /* | |
914 | * Enter a procedure by creating and executing a call instruction. | |
915 | */ | |
916 | ||
917 | #define CALLSIZE 7 /* size of call instruction */ | |
918 | ||
919 | public beginproc(p, argc) | |
920 | Symbol p; | |
921 | Integer argc; | |
922 | { | |
923 | char save[CALLSIZE]; | |
924 | struct { | |
925 | VaxOpcode op; | |
926 | unsigned char numargs; | |
927 | unsigned char mode; | |
928 | char addr[sizeof(long)]; /* unaligned long */ | |
929 | } call; | |
930 | long dest; | |
931 | ||
932 | pc = 2; | |
933 | iread(save, pc, sizeof(save)); | |
934 | call.op = O_CALLS; | |
935 | call.numargs = argc; | |
936 | call.mode = 0xef; | |
937 | dest = codeloc(p) - 2 - (pc + 7); | |
938 | mov(&dest, call.addr, sizeof(call.addr)); | |
939 | iwrite(&call, pc, sizeof(call)); | |
940 | setreg(PROGCTR, pc); | |
2fd0f574 | 941 | pstep(process, DEFSIG); |
cd6e9098 ML |
942 | iwrite(save, pc, sizeof(save)); |
943 | pc = reg(PROGCTR); | |
944 | if (not isbperr()) { | |
945 | printstatus(); | |
946 | } | |
947 | } |