Commit | Line | Data |
---|---|---|
2a24676e DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
cd6e9098 | 6 | |
2a24676e | 7 | #ifndef lint |
95f51977 | 8 | static char sccsid[] = "@(#)machine.c 5.1 (Berkeley) 5/31/85"; |
2a24676e | 9 | #endif not lint |
0022c355 ML |
10 | |
11 | static char rcsid[] = "$Header: machine.c,v 1.5 84/12/26 10:40:05 linton Exp $"; | |
cd6e9098 ML |
12 | |
13 | /* | |
14 | * Target machine dependent stuff. | |
15 | */ | |
16 | ||
17 | #include "defs.h" | |
18 | #include "machine.h" | |
19 | #include "process.h" | |
2fd0f574 | 20 | #include "runtime.h" |
cd6e9098 ML |
21 | #include "events.h" |
22 | #include "main.h" | |
23 | #include "symbols.h" | |
24 | #include "source.h" | |
25 | #include "mappings.h" | |
26 | #include "object.h" | |
0022c355 | 27 | #include "keywords.h" |
9882bead | 28 | #include "ops.h" |
cd6e9098 ML |
29 | #include <signal.h> |
30 | ||
31 | #ifndef public | |
32 | typedef unsigned int Address; | |
33 | typedef unsigned char Byte; | |
34 | typedef unsigned int Word; | |
35 | ||
36 | #define NREG 16 | |
37 | ||
38 | #define ARGP 12 | |
39 | #define FRP 13 | |
40 | #define STKP 14 | |
41 | #define PROGCTR 15 | |
42 | ||
43 | #define BITSPERBYTE 8 | |
44 | #define BITSPERWORD (BITSPERBYTE * sizeof(Word)) | |
45 | ||
46 | #define nargspassed(frame) argn(0, frame) | |
b4ee78f0 | 47 | |
cd6e9098 ML |
48 | #include "source.h" |
49 | #include "symbols.h" | |
50 | ||
51 | Address pc; | |
52 | Address prtaddr; | |
53 | ||
54 | #endif | |
55 | ||
56 | private Address printop(); | |
57 | ||
58 | /* | |
59 | * Decode and print the instructions within the given address range. | |
60 | */ | |
61 | ||
62 | public printinst(lowaddr, highaddr) | |
63 | Address lowaddr; | |
64 | Address highaddr; | |
65 | { | |
66 | register Address addr; | |
67 | ||
68 | for (addr = lowaddr; addr <= highaddr; ) { | |
69 | addr = printop(addr); | |
70 | } | |
71 | prtaddr = addr; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Another approach: print n instructions starting at the given address. | |
76 | */ | |
77 | ||
78 | public printninst(count, addr) | |
79 | int count; | |
80 | Address addr; | |
81 | { | |
82 | register Integer i; | |
83 | register Address newaddr; | |
84 | ||
85 | if (count <= 0) { | |
86 | error("non-positive repetition count"); | |
87 | } else { | |
88 | newaddr = addr; | |
89 | for (i = 0; i < count; i++) { | |
90 | newaddr = printop(newaddr); | |
91 | } | |
92 | prtaddr = newaddr; | |
93 | } | |
94 | } | |
95 | ||
96 | /* | |
97 | * Hacked version of adb's VAX instruction decoder. | |
98 | */ | |
99 | ||
100 | private Address printop(addr) | |
101 | Address addr; | |
102 | { | |
103 | Optab op; | |
104 | VaxOpcode ins; | |
105 | unsigned char mode; | |
106 | int argtype, amode, argno, argval; | |
107 | String reg; | |
108 | Boolean indexf; | |
109 | short offset; | |
110 | ||
111 | argval = 0; | |
112 | indexf = false; | |
113 | printf("%08x ", addr); | |
114 | iread(&ins, addr, sizeof(ins)); | |
115 | addr += 1; | |
116 | op = optab[ins]; | |
117 | printf("%s", op.iname); | |
118 | for (argno = 0; argno < op.numargs; argno++) { | |
119 | if (indexf == true) { | |
120 | indexf = false; | |
121 | } else if (argno == 0) { | |
122 | printf("\t"); | |
123 | } else { | |
124 | printf(","); | |
125 | } | |
126 | argtype = op.argtype[argno]; | |
127 | if (is_branch_disp(argtype)) { | |
128 | mode = 0xAF + (typelen(argtype) << 5); | |
129 | } else { | |
130 | iread(&mode, addr, sizeof(mode)); | |
131 | addr += 1; | |
132 | } | |
133 | reg = regname[regnm(mode)]; | |
134 | amode = addrmode(mode); | |
135 | switch (amode) { | |
136 | case LITSHORT: | |
137 | case LITUPTO31: | |
138 | case LITUPTO47: | |
139 | case LITUPTO63: | |
140 | if (typelen(argtype) == TYPF || typelen(argtype) ==TYPD) | |
141 | printf("$%s", fltimm[mode]); | |
142 | else | |
143 | printf("$%x", mode); | |
144 | argval = mode; | |
145 | break; | |
146 | ||
147 | case INDEX: | |
148 | printf("[%s]", reg); | |
149 | indexf = true; | |
150 | argno--; | |
151 | break; | |
152 | ||
153 | case REG: | |
154 | printf("%s", reg); | |
155 | break; | |
156 | ||
157 | case REGDEF: | |
158 | printf("(%s)", reg); | |
159 | break; | |
160 | ||
161 | case AUTODEC: | |
162 | printf("-(%s)", reg); | |
163 | break; | |
164 | ||
165 | case AUTOINC: | |
166 | if (reg != regname[PROGCTR]) { | |
167 | printf("(%s)+", reg); | |
168 | } else { | |
169 | printf("$"); | |
170 | switch (typelen(argtype)) { | |
171 | case TYPB: | |
172 | argval = printdisp(addr, 1, reg, amode); | |
173 | addr += 1; | |
174 | break; | |
175 | ||
176 | case TYPW: | |
177 | argval = printdisp(addr, 2, reg, amode); | |
178 | addr += 2; | |
179 | break; | |
180 | ||
181 | case TYPL: | |
182 | argval = printdisp(addr, 4, reg, amode); | |
183 | addr += 4; | |
184 | break; | |
185 | ||
186 | case TYPF: | |
187 | iread(&argval, addr, sizeof(argval)); | |
188 | printf("%06x", argval); | |
189 | addr += 4; | |
190 | break; | |
191 | ||
192 | case TYPQ: | |
193 | case TYPD: | |
194 | iread(&argval, addr, sizeof(argval)); | |
195 | printf("%06x", argval); | |
196 | iread(&argval, addr+4, sizeof(argval)); | |
197 | printf("%06x", argval); | |
198 | addr += 8; | |
199 | break; | |
200 | } | |
201 | } | |
202 | break; | |
203 | ||
204 | case AUTOINCDEF: | |
205 | if (reg == regname[PROGCTR]) { | |
206 | printf("*$"); | |
207 | argval = printdisp(addr, 4, reg, amode); | |
208 | addr += 4; | |
209 | } else { | |
210 | printf("*(%s)+", reg); | |
211 | } | |
212 | break; | |
213 | ||
214 | case BYTEDISP: | |
215 | argval = printdisp(addr, 1, reg, amode); | |
216 | addr += 1; | |
217 | break; | |
218 | ||
219 | case BYTEDISPDEF: | |
220 | printf("*"); | |
221 | argval = printdisp(addr, 1, reg, amode); | |
222 | addr += 1; | |
223 | break; | |
224 | ||
225 | case WORDDISP: | |
226 | argval = printdisp(addr, 2, reg, amode); | |
227 | addr += 2; | |
228 | break; | |
229 | ||
230 | case WORDDISPDEF: | |
231 | printf("*"); | |
232 | argval = printdisp(addr, 2, reg, amode); | |
233 | addr += 2; | |
234 | break; | |
235 | ||
236 | case LONGDISP: | |
237 | argval = printdisp(addr, 4, reg, amode); | |
238 | addr += 4; | |
239 | break; | |
240 | ||
241 | case LONGDISPDEF: | |
242 | printf("*"); | |
243 | argval = printdisp(addr, 4, reg, amode); | |
244 | addr += 4; | |
245 | break; | |
246 | } | |
247 | } | |
248 | if (ins == O_CASEB || ins == O_CASEW || ins == O_CASEL) { | |
249 | for (argno = 0; argno <= argval; argno++) { | |
250 | iread(&offset, addr, sizeof(offset)); | |
251 | printf("\n\t\t%d", offset); | |
252 | addr += 2; | |
253 | } | |
254 | } | |
255 | printf("\n"); | |
256 | return addr; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Print the displacement of an instruction that uses displacement | |
261 | * addressing. | |
262 | */ | |
263 | ||
264 | private int printdisp(addr, nbytes, reg, mode) | |
265 | Address addr; | |
266 | int nbytes; | |
267 | char *reg; | |
268 | int mode; | |
269 | { | |
270 | char byte; | |
271 | short hword; | |
272 | int argval; | |
5d8fcc0a | 273 | Symbol f; |
cd6e9098 ML |
274 | |
275 | switch (nbytes) { | |
276 | case 1: | |
277 | iread(&byte, addr, sizeof(byte)); | |
278 | argval = byte; | |
279 | break; | |
280 | ||
281 | case 2: | |
282 | iread(&hword, addr, sizeof(hword)); | |
283 | argval = hword; | |
284 | break; | |
285 | ||
286 | case 4: | |
287 | iread(&argval, addr, sizeof(argval)); | |
288 | break; | |
289 | } | |
290 | if (reg == regname[PROGCTR] && mode >= BYTEDISP) { | |
291 | argval += addr + nbytes; | |
292 | } | |
293 | if (reg == regname[PROGCTR]) { | |
5d8fcc0a ML |
294 | f = whatblock((Address) argval + 2); |
295 | if (codeloc(f) == argval + 2) { | |
296 | printf("%s", symname(f)); | |
297 | } else { | |
298 | printf("%x", argval); | |
299 | } | |
cd6e9098 | 300 | } else { |
0022c355 ML |
301 | if (varIsSet("$hexoffsets")) { |
302 | if (argval < 0) { | |
303 | printf("-%x(%s)", -(argval), reg); | |
304 | } else { | |
305 | printf("%x(%s)", argval, reg); | |
306 | } | |
307 | } else { | |
308 | printf("%d(%s)", argval, reg); | |
309 | } | |
cd6e9098 ML |
310 | } |
311 | return argval; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Print the contents of the addresses within the given range | |
316 | * according to the given format. | |
317 | */ | |
318 | ||
319 | typedef struct { | |
320 | String name; | |
321 | String printfstring; | |
322 | int length; | |
323 | } Format; | |
324 | ||
325 | private Format fmt[] = { | |
326 | { "d", " %d", sizeof(short) }, | |
327 | { "D", " %ld", sizeof(long) }, | |
328 | { "o", " %o", sizeof(short) }, | |
329 | { "O", " %lo", sizeof(long) }, | |
330 | { "x", " %04x", sizeof(short) }, | |
331 | { "X", " %08x", sizeof(long) }, | |
332 | { "b", " \\%o", sizeof(char) }, | |
333 | { "c", " '%c'", sizeof(char) }, | |
334 | { "s", "%c", sizeof(char) }, | |
5d8fcc0a | 335 | { "f", " %f", sizeof(float) }, |
cd6e9098 ML |
336 | { "g", " %g", sizeof(double) }, |
337 | { nil, nil, 0 } | |
338 | }; | |
339 | ||
08cf9c08 ML |
340 | private Format *findformat(s) |
341 | String s; | |
342 | { | |
343 | register Format *f; | |
344 | ||
345 | f = &fmt[0]; | |
346 | while (f->name != nil and not streq(f->name, s)) { | |
347 | ++f; | |
348 | } | |
349 | if (f->name == nil) { | |
350 | error("bad print format \"%s\"", s); | |
351 | } | |
352 | return f; | |
353 | } | |
354 | ||
cd6e9098 ML |
355 | public Address printdata(lowaddr, highaddr, format) |
356 | Address lowaddr; | |
357 | Address highaddr; | |
358 | String format; | |
359 | { | |
360 | register int n; | |
361 | register Address addr; | |
362 | register Format *f; | |
363 | int value; | |
364 | ||
365 | if (lowaddr > highaddr) { | |
366 | error("first address larger than second"); | |
367 | } | |
08cf9c08 | 368 | f = findformat(format); |
cd6e9098 ML |
369 | n = 0; |
370 | value = 0; | |
371 | for (addr = lowaddr; addr <= highaddr; addr += f->length) { | |
372 | if (n == 0) { | |
373 | printf("%08x: ", addr); | |
374 | } | |
375 | dread(&value, addr, f->length); | |
376 | printf(f->printfstring, value); | |
377 | ++n; | |
378 | if (n >= (16 div f->length)) { | |
379 | putchar('\n'); | |
380 | n = 0; | |
381 | } | |
382 | } | |
383 | if (n != 0) { | |
384 | putchar('\n'); | |
385 | } | |
386 | prtaddr = addr; | |
387 | return addr; | |
388 | } | |
389 | ||
390 | /* | |
391 | * The other approach is to print n items starting with a given address. | |
392 | */ | |
393 | ||
394 | public printndata(count, startaddr, format) | |
395 | int count; | |
396 | Address startaddr; | |
397 | String format; | |
398 | { | |
399 | register int i, n; | |
400 | register Address addr; | |
401 | register Format *f; | |
402 | register Boolean isstring; | |
5d8fcc0a ML |
403 | char c; |
404 | union { | |
405 | char charv; | |
406 | short shortv; | |
407 | int intv; | |
408 | float floatv; | |
409 | double doublev; | |
410 | } value; | |
cd6e9098 ML |
411 | |
412 | if (count <= 0) { | |
413 | error("non-positive repetition count"); | |
414 | } | |
08cf9c08 | 415 | f = findformat(format); |
cd6e9098 ML |
416 | isstring = (Boolean) streq(f->name, "s"); |
417 | n = 0; | |
418 | addr = startaddr; | |
5d8fcc0a | 419 | value.intv = 0; |
cd6e9098 ML |
420 | for (i = 0; i < count; i++) { |
421 | if (n == 0) { | |
422 | printf("%08x: ", addr); | |
423 | } | |
424 | if (isstring) { | |
425 | putchar('"'); | |
5d8fcc0a ML |
426 | dread(&c, addr, sizeof(char)); |
427 | while (c != '\0') { | |
428 | printchar(c); | |
cd6e9098 | 429 | ++addr; |
5d8fcc0a | 430 | dread(&c, addr, sizeof(char)); |
cd6e9098 ML |
431 | } |
432 | putchar('"'); | |
433 | putchar('\n'); | |
434 | n = 0; | |
435 | addr += sizeof(String); | |
436 | } else { | |
437 | dread(&value, addr, f->length); | |
438 | printf(f->printfstring, value); | |
439 | ++n; | |
440 | if (n >= (16 div f->length)) { | |
441 | putchar('\n'); | |
442 | n = 0; | |
443 | } | |
444 | addr += f->length; | |
445 | } | |
446 | } | |
447 | if (n != 0) { | |
448 | putchar('\n'); | |
449 | } | |
450 | prtaddr = addr; | |
451 | } | |
452 | ||
08cf9c08 ML |
453 | /* |
454 | * Print out a value according to the given format. | |
455 | */ | |
456 | ||
457 | public printvalue(v, format) | |
458 | long v; | |
459 | String format; | |
460 | { | |
461 | Format *f; | |
462 | char *p, *q; | |
463 | ||
464 | f = findformat(format); | |
465 | if (streq(f->name, "s")) { | |
466 | putchar('"'); | |
467 | p = (char *) &v; | |
468 | q = p + sizeof(v); | |
469 | while (p < q) { | |
470 | printchar(*p); | |
471 | ++p; | |
472 | } | |
473 | putchar('"'); | |
474 | } else { | |
475 | printf(f->printfstring, v); | |
476 | } | |
477 | putchar('\n'); | |
478 | } | |
479 | ||
cd6e9098 ML |
480 | /* |
481 | * Print out an execution time error. | |
8026876b | 482 | * Assumes the source position of the error has been calculated. |
cd6e9098 ML |
483 | * |
484 | * Have to check if the -r option was specified; if so then | |
485 | * the object file information hasn't been read in yet. | |
486 | */ | |
487 | ||
488 | public printerror() | |
489 | { | |
490 | extern Integer sys_nsig; | |
491 | extern String sys_siglist[]; | |
0022c355 | 492 | integer err; |
cd6e9098 ML |
493 | |
494 | if (isfinished(process)) { | |
1853d822 | 495 | err = exitcode(process); |
0022c355 ML |
496 | if (err == 0) { |
497 | printf("\"%s\" terminated normally\n", objname); | |
498 | } else { | |
499 | printf("\"%s\" terminated abnormally (exit code %d)\n", | |
500 | objname, err | |
501 | ); | |
502 | } | |
cd6e9098 ML |
503 | erecover(); |
504 | } | |
505 | if (runfirst) { | |
0022c355 | 506 | fprintf(stderr, "Entering debugger ...\n"); |
cd6e9098 | 507 | init(); |
cd6e9098 | 508 | } |
cd6e9098 | 509 | err = errnum(process); |
1853d822 SL |
510 | putchar('\n'); |
511 | printsig(err); | |
0022c355 | 512 | putchar(' '); |
1853d822 | 513 | printloc(); |
cd6e9098 ML |
514 | putchar('\n'); |
515 | if (curline > 0) { | |
516 | printlines(curline, curline); | |
517 | } else { | |
518 | printinst(pc, pc); | |
519 | } | |
520 | erecover(); | |
521 | } | |
522 | ||
0022c355 ML |
523 | /* |
524 | * Print out a signal. | |
525 | */ | |
526 | ||
1853d822 | 527 | private String illinames[] = { |
0022c355 ML |
528 | "reserved addressing fault", |
529 | "priviliged instruction fault", | |
530 | "reserved operand fault" | |
1853d822 | 531 | }; |
0022c355 | 532 | |
1853d822 | 533 | private String fpenames[] = { |
0022c355 ML |
534 | nil, |
535 | "integer overflow trap", | |
536 | "integer divide by zero trap", | |
537 | "floating overflow trap", | |
538 | "floating/decimal divide by zero trap", | |
539 | "floating underflow trap", | |
540 | "decimal overflow trap", | |
541 | "subscript out of range trap", | |
542 | "floating overflow fault", | |
543 | "floating divide by zero fault", | |
544 | "floating undeflow fault" | |
1853d822 SL |
545 | }; |
546 | ||
0022c355 ML |
547 | public printsig (signo) |
548 | integer signo; | |
1853d822 | 549 | { |
0022c355 | 550 | integer code; |
1853d822 | 551 | |
0022c355 ML |
552 | if (signo < 0 or signo > sys_nsig) { |
553 | printf("[signal %d]", signo); | |
554 | } else { | |
555 | printf("%s", sys_siglist[signo]); | |
556 | } | |
557 | code = errcode(process); | |
558 | if (signo == SIGILL) { | |
559 | if (code >= 0 and code < sizeof(illinames) / sizeof(illinames[0])) { | |
560 | printf(" (%s)", illinames[code]); | |
561 | } | |
562 | } else if (signo == SIGFPE) { | |
563 | if (code > 0 and code < sizeof(fpenames) / sizeof(fpenames[0])) { | |
564 | printf(" (%s)", fpenames[code]); | |
565 | } | |
1853d822 SL |
566 | } |
567 | } | |
568 | ||
cd6e9098 ML |
569 | /* |
570 | * Note the termination of the program. We do this so as to avoid | |
571 | * having the process exit, which would make the values of variables | |
572 | * inaccessible. We do want to flush all output buffers here, | |
573 | * otherwise it'll never get done. | |
574 | */ | |
575 | ||
576 | public endprogram() | |
577 | { | |
578 | Integer exitcode; | |
579 | ||
580 | stepto(nextaddr(pc, true)); | |
581 | printnews(); | |
582 | exitcode = argn(1, nil); | |
0022c355 ML |
583 | if (exitcode != 0) { |
584 | printf("\nexecution completed (exit code %d)\n", exitcode); | |
585 | } else { | |
586 | printf("\nexecution completed\n"); | |
587 | } | |
cd6e9098 ML |
588 | getsrcpos(); |
589 | erecover(); | |
590 | } | |
591 | ||
592 | /* | |
593 | * Single step the machine a source line (or instruction if "inst_tracing" | |
38f911d6 | 594 | * is true). If "isnext" is true, skip over procedure calls. |
cd6e9098 ML |
595 | */ |
596 | ||
597 | private Address getcall(); | |
598 | ||
599 | public dostep(isnext) | |
600 | Boolean isnext; | |
601 | { | |
602 | register Address addr; | |
603 | register Lineno line; | |
604 | String filename; | |
0022c355 | 605 | Address startaddr; |
cd6e9098 | 606 | |
2fd0f574 | 607 | startaddr = pc; |
cd6e9098 | 608 | addr = nextaddr(pc, isnext); |
38f911d6 | 609 | if (not inst_tracing and nlhdr.nlines != 0) { |
cd6e9098 ML |
610 | line = linelookup(addr); |
611 | while (line == 0) { | |
0022c355 | 612 | addr = nextaddr(addr, isnext); |
cd6e9098 ML |
613 | line = linelookup(addr); |
614 | } | |
38f911d6 ML |
615 | curline = line; |
616 | } else { | |
617 | curline = 0; | |
cd6e9098 ML |
618 | } |
619 | stepto(addr); | |
cd6e9098 ML |
620 | filename = srcfilename(addr); |
621 | setsource(filename); | |
622 | } | |
623 | ||
624 | /* | |
625 | * Compute the next address that will be executed from the given one. | |
626 | * If "isnext" is true then consider a procedure call as straight line code. | |
627 | * | |
628 | * We must unfortunately do much of the same work that is necessary | |
629 | * to print instructions. In addition we have to deal with branches. | |
630 | * Unconditional branches we just follow, for conditional branches | |
631 | * we continue execution to the current location and then single step | |
632 | * the machine. We assume that the last argument in an instruction | |
633 | * that branches is the branch address (or relative offset). | |
634 | */ | |
635 | ||
0022c355 ML |
636 | private Address findnextaddr(); |
637 | ||
cd6e9098 ML |
638 | public Address nextaddr(startaddr, isnext) |
639 | Address startaddr; | |
2fd0f574 SL |
640 | boolean isnext; |
641 | { | |
642 | Address addr; | |
643 | ||
644 | addr = usignal(process); | |
645 | if (addr == 0 or addr == 1) { | |
646 | addr = findnextaddr(startaddr, isnext); | |
647 | } | |
648 | return addr; | |
649 | } | |
650 | ||
0022c355 ML |
651 | /* |
652 | * Determine if it's ok to skip function f entered by instruction ins. | |
653 | * If so, we're going to compute the return address and step to it. | |
654 | * Therefore we cannot skip over a function entered by a jsb or bsb, | |
655 | * since the return address is not easily computed for them. | |
656 | */ | |
657 | ||
658 | private boolean skipfunc (ins, f) | |
659 | VaxOpcode ins; | |
660 | Symbol f; | |
661 | { | |
662 | boolean b; | |
663 | ||
664 | b = (boolean) ( | |
665 | ins != O_JSB and ins != O_BSBB and ins != O_BSBW and | |
666 | not inst_tracing and nlhdr.nlines != 0 and | |
667 | nosource(curfunc) and canskip(curfunc) | |
668 | ); | |
669 | return b; | |
670 | } | |
671 | ||
2fd0f574 SL |
672 | private Address findnextaddr(startaddr, isnext) |
673 | Address startaddr; | |
cd6e9098 ML |
674 | Boolean isnext; |
675 | { | |
676 | register Address addr; | |
677 | Optab op; | |
678 | VaxOpcode ins; | |
679 | unsigned char mode; | |
680 | int argtype, amode, argno, argval; | |
681 | String r; | |
682 | Boolean indexf; | |
683 | enum { KNOWN, SEQUENTIAL, BRANCH } addrstatus; | |
684 | ||
685 | argval = 0; | |
686 | indexf = false; | |
687 | addr = startaddr; | |
688 | iread(&ins, addr, sizeof(ins)); | |
689 | switch (ins) { | |
0022c355 ML |
690 | /* |
691 | * It used to be that unconditional jumps and branches were handled | |
692 | * by taking their destination address as the next address. While | |
693 | * saving the cost of starting up the process, this approach | |
694 | * doesn't work when jumping indirect (since the value in the | |
695 | * register might not yet have been set). | |
696 | * | |
697 | * So unconditional jumps and branches are now handled the same way | |
698 | * as conditional jumps and branches. | |
699 | * | |
cd6e9098 ML |
700 | case O_BRB: |
701 | case O_BRW: | |
cd6e9098 ML |
702 | addrstatus = BRANCH; |
703 | break; | |
0022c355 ML |
704 | * |
705 | */ | |
cd6e9098 ML |
706 | |
707 | case O_BSBB: | |
708 | case O_BSBW: | |
709 | case O_JSB: | |
710 | case O_CALLG: | |
711 | case O_CALLS: | |
0022c355 ML |
712 | addrstatus = KNOWN; |
713 | stepto(addr); | |
714 | pstep(process, DEFSIG); | |
715 | addr = reg(PROGCTR); | |
716 | pc = addr; | |
717 | setcurfunc(whatblock(pc)); | |
718 | if (not isbperr()) { | |
719 | printstatus(); | |
720 | /* NOTREACHED */ | |
721 | } | |
722 | bpact(); | |
723 | if (isnext or skipfunc(ins, curfunc)) { | |
cd6e9098 | 724 | addrstatus = KNOWN; |
0022c355 | 725 | addr = return_addr(); |
cd6e9098 | 726 | stepto(addr); |
eac2165c | 727 | bpact(); |
0022c355 ML |
728 | } else { |
729 | callnews(/* iscall = */ true); | |
cd6e9098 ML |
730 | } |
731 | break; | |
732 | ||
733 | case O_RSB: | |
734 | case O_RET: | |
735 | addrstatus = KNOWN; | |
0022c355 | 736 | stepto(addr); |
cd6e9098 | 737 | callnews(/* iscall = */ false); |
0022c355 ML |
738 | pstep(process, DEFSIG); |
739 | addr = reg(PROGCTR); | |
740 | pc = addr; | |
741 | if (not isbperr()) { | |
742 | printstatus(); | |
2fd0f574 | 743 | } |
3b5f59dc | 744 | bpact(); |
cd6e9098 ML |
745 | break; |
746 | ||
0022c355 | 747 | case O_BRB: case O_BRW: |
2fd0f574 | 748 | case O_JMP: /* because it may be jmp (r1) */ |
cd6e9098 ML |
749 | case O_BNEQ: case O_BEQL: case O_BGTR: |
750 | case O_BLEQ: case O_BGEQ: case O_BLSS: | |
751 | case O_BGTRU: case O_BLEQU: case O_BVC: | |
752 | case O_BVS: case O_BCC: case O_BCS: | |
753 | case O_CASEB: case O_CASEW: case O_CASEL: | |
754 | case O_BBS: case O_BBC: case O_BBSS: case O_BBCS: | |
755 | case O_BBSC: case O_BBCC: case O_BBSSI: | |
756 | case O_BBCCI: case O_BLBS: case O_BLBC: | |
757 | case O_ACBL: case O_AOBLSS: case O_AOBLEQ: | |
758 | case O_SOBGEQ: case O_SOBGTR: | |
759 | addrstatus = KNOWN; | |
760 | stepto(addr); | |
2fd0f574 | 761 | pstep(process, DEFSIG); |
cd6e9098 ML |
762 | addr = reg(PROGCTR); |
763 | pc = addr; | |
764 | if (not isbperr()) { | |
765 | printstatus(); | |
766 | } | |
767 | break; | |
768 | ||
769 | default: | |
770 | addrstatus = SEQUENTIAL; | |
771 | break; | |
772 | } | |
773 | if (addrstatus != KNOWN) { | |
774 | addr += 1; | |
775 | op = optab[ins]; | |
776 | for (argno = 0; argno < op.numargs; argno++) { | |
777 | if (indexf == true) { | |
778 | indexf = false; | |
779 | } | |
780 | argtype = op.argtype[argno]; | |
781 | if (is_branch_disp(argtype)) { | |
782 | mode = 0xAF + (typelen(argtype) << 5); | |
783 | } else { | |
784 | iread(&mode, addr, sizeof(mode)); | |
785 | addr += 1; | |
786 | } | |
787 | r = regname[regnm(mode)]; | |
788 | amode = addrmode(mode); | |
789 | switch (amode) { | |
790 | case LITSHORT: | |
791 | case LITUPTO31: | |
792 | case LITUPTO47: | |
793 | case LITUPTO63: | |
794 | argval = mode; | |
795 | break; | |
796 | ||
797 | case INDEX: | |
798 | indexf = true; | |
799 | --argno; | |
800 | break; | |
801 | ||
802 | case REG: | |
803 | case REGDEF: | |
804 | case AUTODEC: | |
805 | break; | |
806 | ||
807 | case AUTOINC: | |
808 | if (r == regname[PROGCTR]) { | |
809 | switch (typelen(argtype)) { | |
810 | case TYPB: | |
811 | argval = getdisp(addr, 1, r, amode); | |
812 | addr += 1; | |
813 | break; | |
814 | ||
815 | case TYPW: | |
816 | argval = getdisp(addr, 2, r, amode); | |
817 | addr += 2; | |
818 | break; | |
819 | ||
820 | case TYPL: | |
821 | argval = getdisp(addr, 4, r, amode); | |
822 | addr += 4; | |
823 | break; | |
824 | ||
825 | case TYPF: | |
826 | iread(&argval, addr, sizeof(argval)); | |
827 | addr += 4; | |
828 | break; | |
829 | ||
830 | case TYPQ: | |
831 | case TYPD: | |
832 | iread(&argval, addr+4, sizeof(argval)); | |
833 | addr += 8; | |
834 | break; | |
835 | } | |
836 | } | |
837 | break; | |
838 | ||
839 | case AUTOINCDEF: | |
840 | if (r == regname[PROGCTR]) { | |
841 | argval = getdisp(addr, 4, r, amode); | |
842 | addr += 4; | |
843 | } | |
844 | break; | |
845 | ||
846 | case BYTEDISP: | |
847 | case BYTEDISPDEF: | |
848 | argval = getdisp(addr, 1, r, amode); | |
849 | addr += 1; | |
850 | break; | |
851 | ||
852 | case WORDDISP: | |
853 | case WORDDISPDEF: | |
854 | argval = getdisp(addr, 2, r, amode); | |
855 | addr += 2; | |
856 | break; | |
857 | ||
858 | case LONGDISP: | |
859 | case LONGDISPDEF: | |
860 | argval = getdisp(addr, 4, r, amode); | |
861 | addr += 4; | |
862 | break; | |
863 | } | |
864 | } | |
865 | if (ins == O_CALLS or ins == O_CALLG) { | |
866 | argval += 2; | |
867 | } | |
868 | if (addrstatus == BRANCH) { | |
869 | addr = argval; | |
870 | } | |
871 | } | |
872 | return addr; | |
873 | } | |
874 | ||
875 | /* | |
876 | * Get the displacement of an instruction that uses displacement addressing. | |
877 | */ | |
878 | ||
879 | private int getdisp(addr, nbytes, reg, mode) | |
880 | Address addr; | |
881 | int nbytes; | |
882 | String reg; | |
883 | int mode; | |
884 | { | |
885 | char byte; | |
886 | short hword; | |
887 | int argval; | |
888 | ||
889 | switch (nbytes) { | |
890 | case 1: | |
891 | iread(&byte, addr, sizeof(byte)); | |
892 | argval = byte; | |
893 | break; | |
894 | ||
895 | case 2: | |
896 | iread(&hword, addr, sizeof(hword)); | |
897 | argval = hword; | |
898 | break; | |
899 | ||
900 | case 4: | |
901 | iread(&argval, addr, sizeof(argval)); | |
902 | break; | |
903 | } | |
904 | if (reg == regname[PROGCTR] && mode >= BYTEDISP) { | |
905 | argval += addr + nbytes; | |
906 | } | |
907 | return argval; | |
908 | } | |
909 | ||
910 | #define BP_OP O_BPT /* breakpoint trap */ | |
911 | #define BP_ERRNO SIGTRAP /* signal received at a breakpoint */ | |
912 | ||
913 | /* | |
914 | * Setting a breakpoint at a location consists of saving | |
915 | * the word at the location and poking a BP_OP there. | |
916 | * | |
917 | * We save the locations and words on a list for use in unsetting. | |
918 | */ | |
919 | ||
920 | typedef struct Savelist *Savelist; | |
921 | ||
922 | struct Savelist { | |
923 | Address location; | |
924 | Byte save; | |
925 | Byte refcount; | |
926 | Savelist link; | |
927 | }; | |
928 | ||
929 | private Savelist savelist; | |
930 | ||
931 | /* | |
932 | * Set a breakpoint at the given address. Only save the word there | |
933 | * if it's not already a breakpoint. | |
934 | */ | |
935 | ||
936 | public setbp(addr) | |
937 | Address addr; | |
938 | { | |
939 | Byte w; | |
940 | Byte save; | |
941 | register Savelist newsave, s; | |
942 | ||
943 | for (s = savelist; s != nil; s = s->link) { | |
944 | if (s->location == addr) { | |
945 | s->refcount++; | |
946 | return; | |
947 | } | |
948 | } | |
08cf9c08 | 949 | iread(&save, addr, sizeof(save)); |
cd6e9098 ML |
950 | newsave = new(Savelist); |
951 | newsave->location = addr; | |
952 | newsave->save = save; | |
953 | newsave->refcount = 1; | |
954 | newsave->link = savelist; | |
955 | savelist = newsave; | |
956 | w = BP_OP; | |
957 | iwrite(&w, addr, sizeof(w)); | |
958 | } | |
959 | ||
960 | /* | |
961 | * Unset a breakpoint; unfortunately we have to search the SAVELIST | |
962 | * to find the saved value. The assumption is that the SAVELIST will | |
963 | * usually be quite small. | |
964 | */ | |
965 | ||
966 | public unsetbp(addr) | |
967 | Address addr; | |
968 | { | |
969 | register Savelist s, prev; | |
970 | ||
971 | prev = nil; | |
972 | for (s = savelist; s != nil; s = s->link) { | |
973 | if (s->location == addr) { | |
974 | iwrite(&s->save, addr, sizeof(s->save)); | |
975 | s->refcount--; | |
976 | if (s->refcount == 0) { | |
977 | if (prev == nil) { | |
978 | savelist = s->link; | |
979 | } else { | |
980 | prev->link = s->link; | |
981 | } | |
982 | dispose(s); | |
983 | } | |
984 | return; | |
985 | } | |
986 | prev = s; | |
987 | } | |
988 | panic("unsetbp: couldn't find address %d", addr); | |
989 | } | |
990 | ||
cd6e9098 ML |
991 | /* |
992 | * Enter a procedure by creating and executing a call instruction. | |
993 | */ | |
994 | ||
995 | #define CALLSIZE 7 /* size of call instruction */ | |
996 | ||
997 | public beginproc(p, argc) | |
998 | Symbol p; | |
999 | Integer argc; | |
1000 | { | |
1001 | char save[CALLSIZE]; | |
1002 | struct { | |
1003 | VaxOpcode op; | |
1004 | unsigned char numargs; | |
1005 | unsigned char mode; | |
1006 | char addr[sizeof(long)]; /* unaligned long */ | |
1007 | } call; | |
1008 | long dest; | |
1009 | ||
1010 | pc = 2; | |
1011 | iread(save, pc, sizeof(save)); | |
1012 | call.op = O_CALLS; | |
1013 | call.numargs = argc; | |
1014 | call.mode = 0xef; | |
1015 | dest = codeloc(p) - 2 - (pc + 7); | |
1016 | mov(&dest, call.addr, sizeof(call.addr)); | |
1017 | iwrite(&call, pc, sizeof(call)); | |
1018 | setreg(PROGCTR, pc); | |
2fd0f574 | 1019 | pstep(process, DEFSIG); |
cd6e9098 ML |
1020 | iwrite(save, pc, sizeof(save)); |
1021 | pc = reg(PROGCTR); | |
1022 | if (not isbperr()) { | |
1023 | printstatus(); | |
1024 | } | |
1025 | } |