Commit | Line | Data |
---|---|---|
0674773e DS |
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 | */ | |
6 | ||
7 | #ifndef lint | |
8 | static char sccsid[] = "@(#)iris.c 5.1 (Berkeley) %G%"; | |
9 | #endif not lint | |
10 | ||
11 | static char rcsid[] = "$Header: machine.c,v 1.2 87/03/26 14:54:55 donn Exp $"; | |
12 | ||
13 | /* | |
14 | * Target machine dependent stuff. | |
15 | */ | |
16 | ||
17 | #include "defs.h" | |
18 | #include "machine.h" | |
19 | #include "process.h" | |
20 | #include "runtime.h" | |
21 | #include "events.h" | |
22 | #include "main.h" | |
23 | #include "symbols.h" | |
24 | #include "source.h" | |
25 | #include "mappings.h" | |
26 | #include "object.h" | |
27 | #include "tree.h" | |
28 | #include "eval.h" | |
29 | #include "keywords.h" | |
30 | #include "ops.h" | |
31 | ||
32 | #ifndef public | |
33 | typedef unsigned int Address; | |
34 | typedef unsigned char Byte; | |
35 | typedef unsigned int Word; | |
36 | ||
37 | /* | |
38 | * On the 68000, the pc isn't in a register, but we make believe | |
39 | * so there's one more register. | |
40 | * | |
41 | * Note that there's also no argument pointer, this means code | |
42 | * involving "ARGP" should always be #ifdef'd. | |
43 | * | |
44 | * The address corresponding to the beginning of a function is recorded | |
45 | * as the address + FUNCOFFSET (skip the link instruction so that | |
46 | * local information is available). | |
47 | */ | |
48 | ||
49 | #define NREG 17 | |
50 | ||
51 | #define FRP 14 | |
52 | #define STKP 15 | |
53 | #define PROGCTR 16 | |
54 | ||
55 | #define CALL_RETADDR 0x800c /* Return address for 'call' command */ | |
56 | #define FUNCOFFSET 4 | |
57 | ||
58 | #ifdef sun | |
59 | # define CODESTART 0x8000 | |
60 | #else /* IRIS */ | |
61 | # define CODESTART 0x1000 | |
62 | #endif | |
63 | ||
64 | #define optab_init() | |
65 | ||
66 | #define BITSPERBYTE 8 | |
67 | #define BITSPERWORD (BITSPERBYTE * sizeof(Word)) | |
68 | ||
69 | /* | |
70 | * This magic macro enables us to look at the process' registers | |
71 | * in its user structure. | |
72 | */ | |
73 | ||
74 | #define regloc(reg) (ctob(UPAGES) + (sizeof(Word) * ((reg) - PC)) - 10) | |
75 | ||
76 | #include "source.h" | |
77 | #include "symbols.h" | |
78 | #include <signal.h> | |
79 | #include <sys/param.h> | |
80 | #include <sys/dir.h> | |
81 | #include <machine/psl.h> | |
82 | #include <machine/pte.h> | |
83 | #include <sys/user.h> | |
84 | #undef DELETE /* XXX */ | |
85 | #include <sys/vm.h> | |
86 | #include <machine/reg.h> | |
87 | ||
88 | Address pc; | |
89 | Address prtaddr; | |
90 | ||
91 | #endif | |
92 | ||
93 | /* | |
94 | * Indices into u. for use in collecting registers values. | |
95 | */ | |
96 | public int rloc[] ={ | |
97 | #ifdef sun | |
98 | R0, R1, R2, R3, R4, R5, R6, R7, AR0, AR1, AR2, AR3, AR4, AR5, AR6, AR7, PC | |
99 | #else /* IRIS */ | |
100 | R0, R1, R2, R3, R4, R5, R6, R7, AR0, AR1, AR2, AR3, AR4, AR5, AR6, AR7, 16 | |
101 | #endif | |
102 | }; | |
103 | ||
104 | private Address printop(); | |
105 | ||
106 | /* | |
107 | * Decode and print the instructions within the given address range. | |
108 | */ | |
109 | ||
110 | public printinst(lowaddr, highaddr) | |
111 | Address lowaddr; | |
112 | Address highaddr; | |
113 | { | |
114 | register Address addr; | |
115 | ||
116 | for (addr = lowaddr; addr <= highaddr; ) { | |
117 | addr = printop(addr); | |
118 | } | |
119 | prtaddr = addr; | |
120 | } | |
121 | ||
122 | /* | |
123 | * Another approach: print n instructions starting at the given address. | |
124 | */ | |
125 | ||
126 | public printninst(count, addr) | |
127 | int count; | |
128 | Address addr; | |
129 | { | |
130 | register Integer i; | |
131 | register Address newaddr; | |
132 | ||
133 | if (count <= 0) { | |
134 | error("non-positive repetition count"); | |
135 | } else { | |
136 | newaddr = addr; | |
137 | for (i = 0; i < count; i++) { | |
138 | newaddr = printop(newaddr); | |
139 | } | |
140 | prtaddr = newaddr; | |
141 | } | |
142 | } | |
143 | ||
144 | /* | |
145 | * Print the contents of the addresses within the given range | |
146 | * according to the given format. | |
147 | */ | |
148 | ||
149 | typedef struct { | |
150 | String name; | |
151 | String printfstring; | |
152 | int length; | |
153 | } Format; | |
154 | ||
155 | private Format fmt[] = { | |
156 | { "d", " %d", sizeof(short) }, | |
157 | { "D", " %ld", sizeof(long) }, | |
158 | { "o", " %o", sizeof(short) }, | |
159 | { "O", " %lo", sizeof(long) }, | |
160 | { "x", " %04x", sizeof(short) }, | |
161 | { "X", " %08x", sizeof(long) }, | |
162 | { "b", " \\%o", sizeof(char) }, | |
163 | { "c", " '%c'", sizeof(char) }, | |
164 | { "s", "%c", sizeof(char) }, | |
165 | { "f", " %f", sizeof(float) }, | |
166 | { "g", " %g", sizeof(double) }, | |
167 | { nil, nil, 0 } | |
168 | }; | |
169 | ||
170 | private Format *findformat(s) | |
171 | String s; | |
172 | { | |
173 | register Format *f; | |
174 | ||
175 | f = &fmt[0]; | |
176 | while (f->name != nil and not streq(f->name, s)) { | |
177 | ++f; | |
178 | } | |
179 | if (f->name == nil) { | |
180 | error("bad print format \"%s\"", s); | |
181 | } | |
182 | return f; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Retrieve and print out the appropriate data in the given format. | |
187 | * Floats have to be handled specially to allow the compiler to | |
188 | * convert them to doubles when passing to printf. | |
189 | */ | |
190 | ||
191 | private printformat (f, addr) | |
192 | Format *f; | |
193 | Address addr; | |
194 | { | |
195 | union { | |
196 | char charv; | |
197 | short shortv; | |
198 | int intv; | |
199 | float floatv; | |
200 | double doublev; | |
201 | } value; | |
202 | ||
203 | value.intv = 0; | |
204 | dread(&value, addr, f->length); | |
205 | if (streq(f->name, "f")) { | |
206 | printf(f->printfstring, value.floatv); | |
207 | } else { | |
208 | printf(f->printfstring, value); | |
209 | } | |
210 | } | |
211 | ||
212 | public Address printdata(lowaddr, highaddr, format) | |
213 | Address lowaddr; | |
214 | Address highaddr; | |
215 | String format; | |
216 | { | |
217 | int n; | |
218 | register Address addr; | |
219 | Format *f; | |
220 | ||
221 | if (lowaddr > highaddr) { | |
222 | error("first address larger than second"); | |
223 | } | |
224 | f = findformat(format); | |
225 | n = 0; | |
226 | for (addr = lowaddr; addr <= highaddr; addr += f->length) { | |
227 | if (n == 0) { | |
228 | printf("%08x: ", addr); | |
229 | } | |
230 | printformat(f, addr); | |
231 | ++n; | |
232 | if (n >= (16 div f->length)) { | |
233 | printf("\n"); | |
234 | n = 0; | |
235 | } | |
236 | } | |
237 | if (n != 0) { | |
238 | printf("\n"); | |
239 | } | |
240 | prtaddr = addr; | |
241 | return addr; | |
242 | } | |
243 | ||
244 | /* | |
245 | * The other approach is to print n items starting with a given address. | |
246 | */ | |
247 | ||
248 | public printndata(count, startaddr, format) | |
249 | int count; | |
250 | Address startaddr; | |
251 | String format; | |
252 | { | |
253 | int i, n; | |
254 | Address addr; | |
255 | Format *f; | |
256 | Boolean isstring; | |
257 | char c; | |
258 | ||
259 | if (count <= 0) { | |
260 | error("non-positive repetition count"); | |
261 | } | |
262 | f = findformat(format); | |
263 | isstring = (Boolean) streq(f->name, "s"); | |
264 | n = 0; | |
265 | addr = startaddr; | |
266 | for (i = 0; i < count; i++) { | |
267 | if (n == 0) { | |
268 | printf("%08x: ", addr); | |
269 | } | |
270 | if (isstring) { | |
271 | printf("\""); | |
272 | dread(&c, addr, sizeof(char)); | |
273 | while (c != '\0') { | |
274 | printchar(c); | |
275 | ++addr; | |
276 | dread(&c, addr, sizeof(char)); | |
277 | } | |
278 | printf("\"\n"); | |
279 | n = 0; | |
280 | addr += sizeof(String); | |
281 | } else { | |
282 | printformat(f, addr); | |
283 | ++n; | |
284 | if (n >= (16 div f->length)) { | |
285 | printf("\n"); | |
286 | n = 0; | |
287 | } | |
288 | addr += f->length; | |
289 | } | |
290 | } | |
291 | if (n != 0) { | |
292 | printf("\n"); | |
293 | } | |
294 | prtaddr = addr; | |
295 | } | |
296 | ||
297 | /* | |
298 | * Print out a value according to the given format. | |
299 | */ | |
300 | ||
301 | public printvalue(v, format) | |
302 | long v; | |
303 | String format; | |
304 | { | |
305 | Format *f; | |
306 | char *p, *q; | |
307 | ||
308 | f = findformat(format); | |
309 | if (streq(f->name, "s")) { | |
310 | putchar('"'); | |
311 | p = (char *) &v; | |
312 | q = p + sizeof(v); | |
313 | while (p < q) { | |
314 | printchar(*p); | |
315 | ++p; | |
316 | } | |
317 | putchar('"'); | |
318 | } else { | |
319 | printf(f->printfstring, v); | |
320 | } | |
321 | putchar('\n'); | |
322 | } | |
323 | ||
324 | /* | |
325 | * Print out an execution time error. | |
326 | * Assumes the source position of the error has been calculated. | |
327 | * | |
328 | * Have to check if the -r option was specified; if so then | |
329 | * the object file information hasn't been read in yet. | |
330 | */ | |
331 | ||
332 | public printerror() | |
333 | { | |
334 | extern Integer sys_nsig; | |
335 | extern String sys_siglist[]; | |
336 | integer err; | |
337 | ||
338 | if (isfinished(process)) { | |
339 | err = exitcode(process); | |
340 | if (err == 0) { | |
341 | printf("\"%s\" terminated normally\n", objname); | |
342 | } else { | |
343 | printf("\"%s\" terminated abnormally (exit code %d)\n", | |
344 | objname, err | |
345 | ); | |
346 | } | |
347 | erecover(); | |
348 | } | |
349 | err = errnum(process); | |
350 | putchar('\n'); | |
351 | printsig(err); | |
352 | putchar(' '); | |
353 | printloc(); | |
354 | putchar('\n'); | |
355 | if (curline > 0) { | |
356 | printlines(curline, curline); | |
357 | } else { | |
358 | printinst(pc, pc); | |
359 | } | |
360 | erecover(); | |
361 | } | |
362 | ||
363 | /* | |
364 | * Print out a signal. | |
365 | */ | |
366 | ||
367 | private String illinames[] = { | |
368 | "reserved addressing fault", | |
369 | "privileged instruction fault", | |
370 | "reserved operand fault" | |
371 | }; | |
372 | ||
373 | private String fpenames[] = { | |
374 | nil, | |
375 | "integer overflow trap", | |
376 | "integer divide by zero trap", | |
377 | "floating overflow trap", | |
378 | "floating/decimal divide by zero trap", | |
379 | "floating underflow trap", | |
380 | "decimal overflow trap", | |
381 | "subscript out of range trap", | |
382 | "floating overflow fault", | |
383 | "floating divide by zero fault", | |
384 | "floating underflow fault" | |
385 | }; | |
386 | ||
387 | public printsig (signo) | |
388 | integer signo; | |
389 | { | |
390 | integer code; | |
391 | ||
392 | if (signo < 0 or signo > sys_nsig) { | |
393 | printf("[signal %d]", signo); | |
394 | } else { | |
395 | printf("%s", sys_siglist[signo]); | |
396 | } | |
397 | code = errcode(process); | |
398 | if (signo == SIGILL) { | |
399 | if (code >= 0 and code < sizeof(illinames) / sizeof(illinames[0])) { | |
400 | printf(" (%s)", illinames[code]); | |
401 | } | |
402 | } else if (signo == SIGFPE) { | |
403 | if (code > 0 and code < sizeof(fpenames) / sizeof(fpenames[0])) { | |
404 | printf(" (%s)", fpenames[code]); | |
405 | } | |
406 | } | |
407 | } | |
408 | ||
409 | /* | |
410 | * Note the termination of the program. We do this so as to avoid | |
411 | * having the process exit, which would make the values of variables | |
412 | * inaccessible. We do want to flush all output buffers here, | |
413 | * otherwise it'll never get done. | |
414 | */ | |
415 | ||
416 | public endprogram() | |
417 | { | |
418 | Integer exitcode; | |
419 | ||
420 | stepto(nextaddr(pc, true)); | |
421 | printnews(); | |
422 | exitcode = argn(1, nil); | |
423 | if (exitcode != 0) { | |
424 | printf("\nexecution completed (exit code %d)\n", exitcode); | |
425 | } else { | |
426 | printf("\nexecution completed\n"); | |
427 | } | |
428 | getsrcpos(); | |
429 | erecover(); | |
430 | } | |
431 | ||
432 | /* | |
433 | * Single step the machine a source line (or instruction if "inst_tracing" | |
434 | * is true). If "isnext" is true, skip over procedure calls. | |
435 | */ | |
436 | ||
437 | private Address getcall(); | |
438 | ||
439 | public dostep(isnext) | |
440 | Boolean isnext; | |
441 | { | |
442 | register Address addr; | |
443 | register Lineno line; | |
444 | String filename; | |
445 | Address startaddr; | |
446 | ||
447 | startaddr = pc; | |
448 | addr = nextaddr(pc, isnext); | |
449 | if (not inst_tracing and nlhdr.nlines != 0) { | |
450 | line = linelookup(addr); | |
451 | while (line == 0) { | |
452 | addr = nextaddr(addr, isnext); | |
453 | line = linelookup(addr); | |
454 | } | |
455 | curline = line; | |
456 | } else { | |
457 | curline = 0; | |
458 | } | |
459 | stepto(addr); | |
460 | filename = srcfilename(addr); | |
461 | setsource(filename); | |
462 | } | |
463 | ||
464 | typedef short Bpinst; | |
465 | ||
466 | extern Bpinst BP_OP; | |
467 | #ifdef sun | |
468 | asm("_BP_OP: trap #15"); | |
469 | #else /* IRIS */ | |
470 | asm("_BP_OP: trap #1"); | |
471 | #endif | |
472 | ||
473 | #define BP_ERRNO SIGTRAP /* signal received at a breakpoint */ | |
474 | ||
475 | /* | |
476 | * Setting a breakpoint at a location consists of saving | |
477 | * the word at the location and poking a BP_OP there. | |
478 | * | |
479 | * We save the locations and words on a list for use in unsetting. | |
480 | */ | |
481 | ||
482 | typedef struct Savelist *Savelist; | |
483 | ||
484 | struct Savelist { | |
485 | Address location; | |
486 | Bpinst save; | |
487 | short refcount; | |
488 | Savelist link; | |
489 | }; | |
490 | ||
491 | private Savelist savelist; | |
492 | ||
493 | /* | |
494 | * Set a breakpoint at the given address. Only save the word there | |
495 | * if it's not already a breakpoint. | |
496 | */ | |
497 | ||
498 | public setbp(addr) | |
499 | Address addr; | |
500 | { | |
501 | Bpinst w, save; | |
502 | register Savelist newsave, s; | |
503 | ||
504 | for (s = savelist; s != nil; s = s->link) { | |
505 | if (s->location == addr) { | |
506 | s->refcount++; | |
507 | return; | |
508 | } | |
509 | } | |
510 | iread(&save, addr, sizeof(save)); | |
511 | newsave = new(Savelist); | |
512 | newsave->location = addr; | |
513 | newsave->save = save; | |
514 | newsave->refcount = 1; | |
515 | newsave->link = savelist; | |
516 | savelist = newsave; | |
517 | w = BP_OP; | |
518 | iwrite(&w, addr, sizeof(w)); | |
519 | } | |
520 | ||
521 | /* | |
522 | * Unset a breakpoint; unfortunately we have to search the SAVELIST | |
523 | * to find the saved value. The assumption is that the SAVELIST will | |
524 | * usually be quite small. | |
525 | */ | |
526 | ||
527 | public unsetbp(addr) | |
528 | Address addr; | |
529 | { | |
530 | register Savelist s, prev; | |
531 | ||
532 | prev = nil; | |
533 | for (s = savelist; s != nil; s = s->link) { | |
534 | if (s->location == addr) { | |
535 | iwrite(&s->save, addr, sizeof(s->save)); | |
536 | s->refcount--; | |
537 | if (s->refcount == 0) { | |
538 | if (prev == nil) { | |
539 | savelist = s->link; | |
540 | } else { | |
541 | prev->link = s->link; | |
542 | } | |
543 | dispose(s); | |
544 | } | |
545 | return; | |
546 | } | |
547 | prev = s; | |
548 | } | |
549 | panic("unsetbp: couldn't find address %d", addr); | |
550 | } | |
551 | ||
552 | /* | |
553 | * Instruction decoding routines for 68000, derived from adb. | |
554 | * | |
555 | * The shared boolean variable "printing" is true if the decoded | |
556 | * instruction is to be printed, false if not. In either case, | |
557 | * the address of the next instruction after the given one is returned. | |
558 | */ | |
559 | ||
560 | private Boolean printing; | |
561 | private Boolean following; | |
562 | private Boolean followcalls; | |
563 | private Address instaddr; | |
564 | ||
565 | #define instread(var) \ | |
566 | { \ | |
567 | iread(&var, instaddr, sizeof(var)); \ | |
568 | instaddr += sizeof(var); \ | |
569 | } | |
570 | ||
571 | private Optab *decode(inst, addr) | |
572 | Word inst; | |
573 | Address addr; | |
574 | { | |
575 | register Optab *o; | |
576 | ||
577 | o = &optab[0]; | |
578 | while (o->mask != 0 and (inst&o->mask) != o->match) { | |
579 | ++o; | |
580 | } | |
581 | return o; | |
582 | } | |
583 | ||
584 | private Address printop(addr) | |
585 | Address addr; | |
586 | { | |
587 | Optab *o; | |
588 | short inst; | |
589 | ||
590 | printf("%08x ", addr); | |
591 | iread(&inst, addr, sizeof(inst)); | |
592 | o = decode(inst, addr); | |
593 | if (o->mask == 0) { | |
594 | printf("\tbadop"); | |
595 | instaddr = addr + sizeof(inst); | |
596 | } else { | |
597 | printing = true; | |
598 | following = false; | |
599 | instaddr = addr + sizeof(inst); | |
600 | (*o->opfun)(inst, o->farg); | |
601 | printing = false; | |
602 | } | |
603 | printf("\n"); | |
604 | return instaddr; | |
605 | } | |
606 | ||
607 | /* | |
608 | * Quickly find the return address of the current procedure or function | |
609 | * while single stepping. Just get the word pointed at by sp. | |
610 | */ | |
611 | ||
612 | private Address currtnaddr () | |
613 | { | |
614 | Address retaddr; | |
615 | ||
616 | dread(&retaddr, reg(STKP), sizeof(retaddr)); | |
617 | return retaddr; | |
618 | } | |
619 | ||
620 | /* | |
621 | * Print out the effective address for the given parameters. | |
622 | */ | |
623 | ||
624 | private printea(mode, reg, size) | |
625 | long mode, reg; | |
626 | int size; | |
627 | { | |
628 | long index, disp; | |
629 | static char *aregs[] = { "a0", "a1", "a2", "a3", "a4", "a5", "a6", "sp" }; | |
630 | Byte b; | |
631 | short w; | |
632 | long l; | |
633 | ||
634 | switch ((int)(mode)) { | |
635 | case 0: | |
636 | if (printing) { | |
637 | printf("d%D", reg); | |
638 | } | |
639 | break; | |
640 | ||
641 | case 1: | |
642 | if (printing) { | |
643 | printf("%s", aregs[reg]); | |
644 | } | |
645 | break; | |
646 | ||
647 | case 2: | |
648 | if (printing) { | |
649 | printf("%s@", aregs[reg]); | |
650 | } | |
651 | break; | |
652 | ||
653 | case 3: | |
654 | if (printing) { | |
655 | printf("%s@+", aregs[reg]); | |
656 | } | |
657 | break; | |
658 | ||
659 | case 4: | |
660 | if (printing) { | |
661 | printf("%s@-", aregs[reg]); | |
662 | } | |
663 | break; | |
664 | ||
665 | case 5: | |
666 | instread(w); | |
667 | if (printing) { | |
668 | printf("%s@(%D)", aregs[reg], w); | |
669 | } | |
670 | break; | |
671 | ||
672 | case 6: | |
673 | instread(w); | |
674 | if (printing) { | |
675 | index = w; | |
676 | disp = (char)(index&0377); | |
677 | printf("%s@(%d,%c%D:%c)", aregs[reg], disp, | |
678 | (index&0100000)?'a':'d',(index>>12)&07, | |
679 | (index&04000)?'l':'w'); | |
680 | } | |
681 | break; | |
682 | ||
683 | case 7: | |
684 | switch ((int)(reg)) { | |
685 | case 0: | |
686 | instread(w); | |
687 | if (printing) { | |
688 | index = w; | |
689 | psymoff(index); | |
690 | } | |
691 | break; | |
692 | ||
693 | case 1: | |
694 | instread(l); | |
695 | if (printing) { | |
696 | index = l; | |
697 | psymoff(index); | |
698 | } | |
699 | break; | |
700 | ||
701 | case 2: | |
702 | instread(w); | |
703 | if (printing) { | |
704 | disp = w; | |
705 | psymoff(disp + instaddr); | |
706 | } | |
707 | break; | |
708 | ||
709 | case 3: | |
710 | instread(w); | |
711 | if (printing) { | |
712 | index = w; | |
713 | disp = (char)(index&0377); | |
714 | printf("pc@(%D,%c%D:%c)", disp, | |
715 | (index&0100000)?'a':'d',(index>>12)&07, | |
716 | (index&04000)?'l':'w'); | |
717 | } | |
718 | break; | |
719 | ||
720 | case 4: | |
721 | switch (size) { | |
722 | case sizeof(b): | |
723 | instread(w); | |
724 | index = (w&0xff); | |
725 | break; | |
726 | ||
727 | case sizeof(w): | |
728 | instread(w); | |
729 | index = w; | |
730 | break; | |
731 | ||
732 | case sizeof(l): | |
733 | instread(l); | |
734 | index = l; | |
735 | break; | |
736 | ||
737 | default: | |
738 | if (printing) { | |
739 | printf("unexpected size %d in printea\n", size); | |
740 | } | |
741 | instread(l); | |
742 | index = l; | |
743 | break; | |
744 | } | |
745 | if (printing) { | |
746 | printf(IMDF, index); | |
747 | } | |
748 | break; | |
749 | ||
750 | default: | |
751 | if (printing) { | |
752 | printf("???"); | |
753 | } | |
754 | break; | |
755 | } | |
756 | break; | |
757 | ||
758 | default: | |
759 | if (printing) { | |
760 | printf("???"); | |
761 | } | |
762 | break; | |
763 | } | |
764 | } | |
765 | ||
766 | private printEA(ea, size) | |
767 | long ea; | |
768 | int size; | |
769 | { | |
770 | printea((ea>>3)&07, ea&07, size); | |
771 | } | |
772 | ||
773 | private mapsize(inst) | |
774 | register long inst; | |
775 | { | |
776 | int m; | |
777 | ||
778 | inst >>= 6; | |
779 | inst &= 03; | |
780 | switch (inst) { | |
781 | case 0: | |
782 | m = 1; | |
783 | break; | |
784 | ||
785 | case 1: | |
786 | m = 2; | |
787 | break; | |
788 | ||
789 | case 2: | |
790 | m = 4; | |
791 | break; | |
792 | ||
793 | default: | |
794 | m = -1; | |
795 | break; | |
796 | } | |
797 | return m; | |
798 | } | |
799 | ||
800 | private char suffix(size) | |
801 | int size; | |
802 | { | |
803 | char c; | |
804 | ||
805 | switch (size) { | |
806 | case 1: | |
807 | c = 'b'; | |
808 | break; | |
809 | ||
810 | case 2: | |
811 | c = 'w'; | |
812 | break; | |
813 | ||
814 | case 4: | |
815 | c = 'l'; | |
816 | break; | |
817 | ||
818 | default: | |
819 | panic("bad size %d in suffix", size); | |
820 | } | |
821 | return c; | |
822 | } | |
823 | ||
824 | /* | |
825 | * Print an address offset. Eventually this should attempt to be symbolic, | |
826 | * but for now its just printed in hex. | |
827 | */ | |
828 | ||
829 | private psymoff (off) | |
830 | Word off; | |
831 | { | |
832 | Symbol f; | |
833 | ||
834 | f = whatblock((Address) (off + FUNCOFFSET)); | |
835 | if (codeloc(f) == off + FUNCOFFSET) { | |
836 | printf("%s", symname(f)); | |
837 | } else { | |
838 | printf("0x%x", off); | |
839 | } | |
840 | } | |
841 | ||
842 | /* | |
843 | * Instruction class specific routines. | |
844 | */ | |
845 | ||
846 | public omove(inst, s) | |
847 | long inst; | |
848 | String s; | |
849 | { | |
850 | register int c; | |
851 | int size; | |
852 | ||
853 | c = s[0]; | |
854 | if (printing) { | |
855 | printf("\tmov%c\t", c); | |
856 | } | |
857 | size = ((c == 'b') ? 1 : (c == 'w') ? 2 : 4); | |
858 | printea((inst>>3)&07, inst&07, size); | |
859 | if (printing) { | |
860 | printf(","); | |
861 | } | |
862 | printea((inst>>6)&07, (inst>>9)&07, size); | |
863 | } | |
864 | ||
865 | /* | |
866 | * Two types: bsr (4 bytes) and bsrs (2 bytes) | |
867 | */ | |
868 | ||
869 | public obranch(inst, dummy) | |
870 | long inst; | |
871 | { | |
872 | long disp; | |
873 | String s; | |
874 | short w; | |
875 | Address startingaddr; /* address of branch instruction */ | |
876 | int branchtype; /* type of branch (0 = unconditional) */ | |
877 | Address dest; | |
878 | Address retaddr; /* for bsr instruction */ | |
879 | ||
880 | startingaddr = instaddr - 2; | |
881 | disp = inst&0377; | |
882 | s = "s "; | |
883 | if (disp == 0) { | |
884 | retaddr = startingaddr + 4; | |
885 | } else { | |
886 | retaddr = startingaddr + 2; | |
887 | } | |
888 | if (disp > 127) { | |
889 | disp |= ~0377; | |
890 | } else if (disp == 0){ | |
891 | s = " "; | |
892 | instread(w); | |
893 | disp = w; | |
894 | } | |
895 | branchtype = (int)((inst>>8)&017); | |
896 | dest = startingaddr + 2 + disp; | |
897 | if (printing) { | |
898 | printf("\tb%s%s\t", bname[branchtype], s); | |
899 | psymoff(dest); | |
900 | } | |
901 | if (following) { | |
902 | /* | |
903 | * If we're to follow the dynamic flow of instructions, | |
904 | * we must see where the branch leads. A branchtype of 0 | |
905 | * indicates an unconditional branch which we simply take | |
906 | * as the new instruction address. For a conditional branch, | |
907 | * we continue execution up to the current address, single step, | |
908 | * and keep going. | |
909 | */ | |
910 | if (branchtype == 0) { | |
911 | instaddr = dest; | |
912 | } else if (branchtype == 01) { /* bsr */ | |
913 | if (followcalls) { | |
914 | steppast(startingaddr); | |
915 | curfunc = whatblock(pc, true); | |
916 | if (not isbperr()) { | |
917 | printstatus(); | |
918 | /* NOTREACHED */ | |
919 | } | |
920 | bpact(); | |
921 | if (nosource(curfunc) and canskip(curfunc) and | |
922 | nlhdr.nlines != 0) { | |
923 | stepto(retaddr); | |
924 | instaddr = pc; | |
925 | bpact(); | |
926 | } else { | |
927 | callnews(/* iscall = */ true); | |
928 | } | |
929 | } | |
930 | } else { | |
931 | steppast(startingaddr); | |
932 | } | |
933 | } | |
934 | } | |
935 | ||
936 | public odbcc(inst, form) | |
937 | long inst; | |
938 | String form; | |
939 | { | |
940 | long disp; | |
941 | short w; | |
942 | ||
943 | instread(w); | |
944 | if (printing) { | |
945 | printf(form, dbname[(int)((inst>>8)&017)], inst&07); | |
946 | psymoff(w + sizeof(w)); | |
947 | } | |
948 | } | |
949 | ||
950 | public oscc(inst, dummy) | |
951 | long inst; | |
952 | long dummy; | |
953 | { | |
954 | if (printing) { | |
955 | printf("\ts%s\t", cname[(int)((inst>>8)&017)]); | |
956 | } | |
957 | printea((inst>>3)&07, inst&07, 1); | |
958 | } | |
959 | ||
960 | public biti(inst, dummy) | |
961 | long inst; | |
962 | long dummy; | |
963 | { | |
964 | short w; | |
965 | ||
966 | if (printing) { | |
967 | printf("\t%s\t", bit[(int)((inst>>6)&03)]); | |
968 | } | |
969 | if (inst&0x0100) { | |
970 | if (printing) { | |
971 | printf("d%D,", inst>>9); | |
972 | } | |
973 | } else { | |
974 | instread(w); | |
975 | if (printing) { | |
976 | printf(IMDF, w); | |
977 | printf(","); | |
978 | } | |
979 | } | |
980 | printEA(inst); | |
981 | } | |
982 | ||
983 | public opmode(inst, opcode) | |
984 | long inst; | |
985 | long opcode; | |
986 | { | |
987 | register int opmode; | |
988 | register int reg; | |
989 | int size; | |
990 | ||
991 | opmode = (int)((inst>>6) & 07); | |
992 | reg = (int)((inst>>9) & 07); | |
993 | if (opmode == 0 or opmode == 4) { | |
994 | size = 1; | |
995 | } else if (opmode == 1 or opmode == 3 or opmode == 5) { | |
996 | size = 2; | |
997 | } else { | |
998 | size = 4; | |
999 | } | |
1000 | if (printing) { | |
1001 | printf("\t%s%c\t", opcode, suffix(size)); | |
1002 | } | |
1003 | if (opmode >= 4 and opmode <= 6) { | |
1004 | if (printing) { | |
1005 | printf("d%d,", reg); | |
1006 | } | |
1007 | printea((inst>>3)&07, inst&07, size); | |
1008 | } else { | |
1009 | printea((inst>>3)&07, inst&07, size); | |
1010 | if (printing) { | |
1011 | printf(",%c%d",(opmode<=2) ? 'd' : 'a', reg); | |
1012 | } | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | public shroi(inst, ds) | |
1017 | long inst; | |
1018 | String ds; | |
1019 | { | |
1020 | int rx, ry; | |
1021 | String opcode; | |
1022 | ||
1023 | if ((inst & 0xC0) == 0xC0) { | |
1024 | opcode = shro[(int)((inst>>9)&03)]; | |
1025 | if (printing) { | |
1026 | printf("\t%s%s\t", opcode, ds); | |
1027 | } | |
1028 | printEA(inst); | |
1029 | } else { | |
1030 | if (printing) { | |
1031 | opcode = shro[(int)((inst>>3)&03)]; | |
1032 | printf("\t%s%s%c\t", opcode, ds, suffix(mapsize(inst))); | |
1033 | rx = (int)((inst>>9)&07); ry = (int)(inst&07); | |
1034 | if ((inst>>5)&01) { | |
1035 | printf("d%d,d%d", rx, ry); | |
1036 | } else { | |
1037 | printf(IMDF, (rx ? rx : 8)); | |
1038 | printf(",d%d", ry); | |
1039 | } | |
1040 | } | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | public oimmed(inst, opcode) | |
1045 | long inst; | |
1046 | register String opcode; | |
1047 | { | |
1048 | register int size; | |
1049 | long const; | |
1050 | short w; | |
1051 | ||
1052 | size = mapsize(inst); | |
1053 | if (size > 0) { | |
1054 | if (size == 4) { | |
1055 | instread(const); | |
1056 | } else { | |
1057 | instread(w); | |
1058 | const = w; | |
1059 | } | |
1060 | if (printing) { | |
1061 | printf("\t%s%c\t", opcode, suffix(size)); | |
1062 | printf(IMDF, const); | |
1063 | printf(","); | |
1064 | } | |
1065 | printEA(inst, size); | |
1066 | } else { | |
1067 | if (printing) { | |
1068 | printf("\tbadop"); | |
1069 | } | |
1070 | } | |
1071 | } | |
1072 | ||
1073 | public oreg(inst, opcode) | |
1074 | long inst; | |
1075 | register String opcode; | |
1076 | { | |
1077 | if (printing) { | |
1078 | printf(opcode, (inst & 07)); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | public extend(inst, opcode) | |
1083 | long inst; | |
1084 | String opcode; | |
1085 | { | |
1086 | register int size; | |
1087 | int ry, rx; | |
1088 | char c; | |
1089 | ||
1090 | if (printing) { | |
1091 | size = mapsize(inst); | |
1092 | ry = (inst&07); | |
1093 | rx = ((inst>>9)&07); | |
1094 | c = ((inst & 0x1000) ? suffix(size) : ' '); | |
1095 | printf("\t%s%c\t", opcode, c); | |
1096 | if (opcode[0] == 'e') { | |
1097 | if (inst & 0x0080) { | |
1098 | printf("d%D,a%D", rx, ry); | |
1099 | } else if (inst & 0x0008) { | |
1100 | printf("a%D,a%D", rx, ry); | |
1101 | } else { | |
1102 | printf("d%D,d%D", rx, ry); | |
1103 | } | |
1104 | } else if ((inst & 0xF000) == 0xB000) { | |
1105 | printf("a%D@+,a%D@+", ry, rx); | |
1106 | } else if (inst & 0x8) { | |
1107 | printf("a%D@-,a%D@-", ry, rx); | |
1108 | } else { | |
1109 | printf("d%D,d%D", ry, rx); | |
1110 | } | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | public olink(inst, dummy) | |
1115 | long inst; | |
1116 | long dummy; | |
1117 | { | |
1118 | short w; | |
1119 | ||
1120 | instread(w); | |
1121 | if (printing) { | |
1122 | printf("\tlink\ta%D,", inst&07); | |
1123 | printf(IMDF, w); | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | public otrap(inst, dummy) | |
1128 | long inst; | |
1129 | { | |
1130 | if (printing) { | |
1131 | printf("\ttrap\t"); | |
1132 | printf(IMDF, inst&017); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | public oneop(inst, opcode) | |
1137 | long inst; | |
1138 | register String opcode; | |
1139 | { | |
1140 | if (printing) { | |
1141 | printf("\t%s",opcode); | |
1142 | } | |
1143 | printEA(inst); | |
1144 | } | |
1145 | ||
1146 | public jsrop(inst, opcode) | |
1147 | long inst; | |
1148 | register String opcode; | |
1149 | { | |
1150 | Address startingaddr; /* beginning of jsr instruction */ | |
1151 | Address retaddr; /* can't call return_addr (frame not set up yet) */ | |
1152 | ||
1153 | startingaddr = instaddr - 2; | |
1154 | switch ((inst >> 3) & 07) { | |
1155 | case 2: | |
1156 | retaddr = instaddr; /* two byte instruction */ | |
1157 | break; | |
1158 | case 5: | |
1159 | case 6: | |
1160 | retaddr = instaddr + 2; /* four byte instruction */ | |
1161 | break; | |
1162 | case 7: | |
1163 | default: | |
1164 | switch (inst & 07) { | |
1165 | case 0: | |
1166 | case 2: | |
1167 | case 3: | |
1168 | retaddr = instaddr + 2; | |
1169 | break; | |
1170 | case 1: | |
1171 | default: | |
1172 | retaddr = instaddr + 4; /* six byte instruction */ | |
1173 | break; | |
1174 | } | |
1175 | break; | |
1176 | } | |
1177 | if (printing) { | |
1178 | printf("\t%s",opcode); | |
1179 | } | |
1180 | printEA(inst); | |
1181 | if (following and followcalls) { | |
1182 | steppast(startingaddr); | |
1183 | curfunc = whatblock(pc, true); | |
1184 | if (not isbperr()) { | |
1185 | printstatus(); | |
1186 | /* NOTREACHED */ | |
1187 | } | |
1188 | bpact(); | |
1189 | if (nosource(curfunc) and canskip(curfunc) and nlhdr.nlines != 0) { | |
1190 | stepto(retaddr); | |
1191 | instaddr = pc; | |
1192 | bpact(); | |
1193 | } else { | |
1194 | callnews(/* iscall = */ true); | |
1195 | } | |
1196 | } | |
1197 | } | |
1198 | ||
1199 | public jmpop(inst, opcode) | |
1200 | long inst; | |
1201 | register String opcode; | |
1202 | { | |
1203 | Address startingaddr; /* beginning of jump instruction */ | |
1204 | ||
1205 | startingaddr = instaddr - 2; | |
1206 | if (printing) { | |
1207 | printf("\t%s",opcode); | |
1208 | } | |
1209 | printEA(inst); | |
1210 | if (following) { | |
1211 | steppast(startingaddr); | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | public pregmask(mask) | |
1216 | register int mask; | |
1217 | { | |
1218 | register int i; | |
1219 | register int flag = 0; | |
1220 | ||
1221 | if (printing) { | |
1222 | printf("#<"); | |
1223 | for (i=0; i<16; i++) { | |
1224 | if (mask&1) { | |
1225 | if (flag) { | |
1226 | printf(","); | |
1227 | } else { | |
1228 | ++flag; | |
1229 | } | |
1230 | printf("%c%d",(i<8) ? 'd' : 'a', i&07); | |
1231 | } | |
1232 | mask >>= 1; | |
1233 | } | |
1234 | printf(">"); | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | public omovem(inst, dummy) | |
1239 | long inst; | |
1240 | long dummy; | |
1241 | { | |
1242 | register int i, list, mask; | |
1243 | register int reglist; | |
1244 | short w; | |
1245 | ||
1246 | i = 0; | |
1247 | list = 0; | |
1248 | mask = 0100000; | |
1249 | instread(w); | |
1250 | reglist = w; | |
1251 | if ((inst & 070) == 040) { /* predecrement */ | |
1252 | for (i = 15; i > 0; i -= 2) { | |
1253 | list |= ((mask & reglist) >> i); | |
1254 | mask >>= 1; | |
1255 | } | |
1256 | for (i = 1; i < 16; i += 2) { | |
1257 | list |= ((mask & reglist) << i); | |
1258 | mask >>= 1; | |
1259 | } | |
1260 | reglist = list; | |
1261 | } | |
1262 | if (printing) { | |
1263 | printf("\tmovem%c\t",(inst&100)?'l':'w'); | |
1264 | } | |
1265 | if (inst&02000) { | |
1266 | printEA(inst); | |
1267 | if (printing) { | |
1268 | printf(","); | |
1269 | } | |
1270 | pregmask(reglist); | |
1271 | } else { | |
1272 | pregmask(reglist); | |
1273 | if (printing) { | |
1274 | printf(","); | |
1275 | } | |
1276 | printEA(inst); | |
1277 | } | |
1278 | } | |
1279 | ||
1280 | public ochk(inst, opcode) | |
1281 | long inst; | |
1282 | register String opcode; | |
1283 | { | |
1284 | if (printing) { | |
1285 | printf("\t%s\t", opcode); | |
1286 | } | |
1287 | printEA(inst, sizeof(Byte)); | |
1288 | if (printing) { | |
1289 | printf(",%c%D", (opcode[0] == 'l') ? 'a' : 'd', (inst>>9)&07); | |
1290 | } | |
1291 | } | |
1292 | ||
1293 | public soneop(inst, opcode) | |
1294 | long inst; | |
1295 | register String opcode; | |
1296 | { | |
1297 | register int size; | |
1298 | ||
1299 | size = mapsize(inst); | |
1300 | if (size > 0) { | |
1301 | if (printing) { | |
1302 | printf("\t%s%c\t", opcode, suffix(size)); | |
1303 | } | |
1304 | printEA(inst); | |
1305 | } else { | |
1306 | if (printing) { | |
1307 | printf("\tbadop"); | |
1308 | } | |
1309 | } | |
1310 | } | |
1311 | ||
1312 | public oquick(inst, opcode) | |
1313 | long inst; | |
1314 | register String opcode; | |
1315 | { | |
1316 | register int size; | |
1317 | register int data; | |
1318 | ||
1319 | size = mapsize(inst); | |
1320 | data = (int)((inst>>9) & 07); | |
1321 | if (data == 0) { | |
1322 | data = 8; | |
1323 | } | |
1324 | if (size > 0) { | |
1325 | if (printing) { | |
1326 | printf("\t%s%c\t", opcode, suffix(size)); | |
1327 | printf(IMDF, data); | |
1328 | printf(","); | |
1329 | } | |
1330 | printEA(inst); | |
1331 | } else { | |
1332 | if (printing) { | |
1333 | printf("\tbadop"); | |
1334 | } | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | public omoveq(inst, dummy) | |
1339 | long inst; | |
1340 | long dummy; | |
1341 | { | |
1342 | register int data; | |
1343 | ||
1344 | if (printing) { | |
1345 | data = (int)(inst & 0377); | |
1346 | if (data > 127) { | |
1347 | data |= ~0377; | |
1348 | } | |
1349 | printf("\tmoveq\t"); | |
1350 | printf(IMDF, data); | |
1351 | printf(",d%D", (inst>>9)&07); | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | public oprint(inst, opcode) | |
1356 | long inst; | |
1357 | register String opcode; | |
1358 | { | |
1359 | if (printing) { | |
1360 | printf("\t%s",opcode); | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | public ostop(inst, opcode) | |
1365 | long inst; | |
1366 | register String opcode; | |
1367 | { | |
1368 | short w; | |
1369 | ||
1370 | instread(w); | |
1371 | if (printing) { | |
1372 | printf(opcode, w); | |
1373 | } | |
1374 | } | |
1375 | ||
1376 | public orts(inst, opcode) | |
1377 | long inst; | |
1378 | register String opcode; | |
1379 | { | |
1380 | Address addr; | |
1381 | ||
1382 | if (following) { | |
1383 | callnews(/* iscall = */ false); | |
1384 | if (inst_tracing) { | |
1385 | addr = currtnaddr(); | |
1386 | } else { | |
1387 | addr = return_addr(); | |
1388 | if (addr == 0) { | |
1389 | stepto(instaddr - 2); | |
1390 | addr = currtnaddr(); | |
1391 | } | |
1392 | } | |
1393 | stepto(addr); | |
1394 | instaddr = pc; | |
1395 | } | |
1396 | if (printing) { | |
1397 | printf("\t%s",opcode); | |
1398 | } | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Not used by C compiler; does an rts but before doing so, pops | |
1403 | * arg bytes from the stack. | |
1404 | */ | |
1405 | ||
1406 | public ortspop(inst, opcode) | |
1407 | long inst; | |
1408 | register String opcode; | |
1409 | { | |
1410 | Address addr; | |
1411 | short w; | |
1412 | ||
1413 | instread(w); | |
1414 | if (following) { | |
1415 | callnews(/* iscall = */ false); | |
1416 | if (inst_tracing) { | |
1417 | addr = currtnaddr(); | |
1418 | } else { | |
1419 | addr = return_addr(); | |
1420 | } | |
1421 | stepto(addr); | |
1422 | instaddr = pc; | |
1423 | } | |
1424 | if (printing) { | |
1425 | printf(opcode, w); | |
1426 | } | |
1427 | } | |
1428 | ||
1429 | public omovs(inst, opcode) | |
1430 | long inst; | |
1431 | String opcode; | |
1432 | { | |
1433 | register int size; | |
1434 | register unsigned int controlword; | |
1435 | short w; | |
1436 | ||
1437 | size = mapsize(inst); | |
1438 | instread(w); | |
1439 | controlword = w >> 11; | |
1440 | if (printing) { | |
1441 | printf("\t%s%c\t", opcode, suffix(size)); | |
1442 | } | |
1443 | if (controlword & 1){ | |
1444 | controlword >>= 1; | |
1445 | if (printing) { | |
1446 | printf((controlword&0x8) ? "a%D," : "d%D,", controlword&7 ); | |
1447 | } | |
1448 | printEA(inst&0xff, size); | |
1449 | } else { | |
1450 | controlword >>= 1; | |
1451 | printEA(inst&0xff, size); | |
1452 | if (printing) { | |
1453 | printf((controlword&0x8) ? ",a%D" : ",d%D", controlword&7); | |
1454 | } | |
1455 | } | |
1456 | } | |
1457 | ||
1458 | public omovc(inst, opcode) | |
1459 | long inst; | |
1460 | String opcode; | |
1461 | { | |
1462 | register unsigned int controlword; | |
1463 | String creg; | |
1464 | short w; | |
1465 | ||
1466 | instread(w); | |
1467 | if (printing) { | |
1468 | controlword = w; | |
1469 | switch (controlword & 0xfff) { | |
1470 | case 0: | |
1471 | creg = "sfc"; | |
1472 | break; | |
1473 | ||
1474 | case 1: | |
1475 | creg = "dfc"; | |
1476 | break; | |
1477 | ||
1478 | case 0x800: | |
1479 | creg = "usp"; | |
1480 | break; | |
1481 | ||
1482 | case 0x801: | |
1483 | creg = "vbr"; | |
1484 | break; | |
1485 | ||
1486 | default: | |
1487 | creg = "???"; | |
1488 | break; | |
1489 | } | |
1490 | controlword >>= 12; | |
1491 | if (inst & 1){ | |
1492 | printf((controlword&0x8) ? "%sa%D,%s" : "%sd%D,%s", | |
1493 | opcode, controlword&7, creg ); | |
1494 | } else { | |
1495 | printf((controlword&0x8) ? "%s%s,a%D" : "%s%s,d%D", | |
1496 | opcode, creg, controlword&7 ); | |
1497 | } | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | /* | |
1502 | * Compute the next address that will be executed from the given one. | |
1503 | * If "isnext" is true then consider a procedure call as straight line code. | |
1504 | * | |
1505 | * Unconditional branches we just follow, for conditional branches | |
1506 | * we continue execution to the current location and then single step | |
1507 | * the machine. | |
1508 | */ | |
1509 | ||
1510 | public Address nextaddr(startaddr, isnext) | |
1511 | Address startaddr; | |
1512 | Boolean isnext; | |
1513 | { | |
1514 | Optab *o; | |
1515 | short inst; | |
1516 | ||
1517 | instaddr = usignal(process); | |
1518 | if (instaddr == 0 or instaddr == 1) { | |
1519 | following = true; | |
1520 | followcalls = (Boolean) (not isnext); | |
1521 | printing = false; | |
1522 | iread(&inst, startaddr, sizeof(inst)); | |
1523 | instaddr = startaddr + sizeof(inst); | |
1524 | o = decode(inst, startaddr); | |
1525 | if (o->mask == 0) { | |
1526 | fprintf(stderr, | |
1527 | "[internal error: undecodable op at 0x%x]\n", startaddr); | |
1528 | fflush(stderr); | |
1529 | } else { | |
1530 | (*o->opfun)(inst, o->farg); | |
1531 | } | |
1532 | following = false; | |
1533 | } | |
1534 | return instaddr; | |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Step to the given address and then execute one instruction past it. | |
1539 | * Set instaddr to the new instruction address. | |
1540 | */ | |
1541 | ||
1542 | private steppast(addr) | |
1543 | Address addr; | |
1544 | { | |
1545 | stepto(addr); | |
1546 | pstep(process, DEFSIG); | |
1547 | pc = reg(PROGCTR); | |
1548 | instaddr = pc; | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * Enter a procedure by creating and executing a call instruction. | |
1553 | */ | |
1554 | ||
1555 | #define CALLSIZE 6 /* size of call instruction */ | |
1556 | ||
1557 | public beginproc(p) | |
1558 | Symbol p; | |
1559 | { | |
1560 | char save[CALLSIZE]; | |
1561 | struct { | |
1562 | short op; | |
1563 | char addr[sizeof(long)]; /* unaligned long */ | |
1564 | } call; | |
1565 | long dest; | |
1566 | ||
1567 | pc = CODESTART + 6; | |
1568 | iread(save, pc, sizeof(save)); | |
1569 | call.op = 0x4eb9; /* jsr */ | |
1570 | dest = codeloc(p) - FUNCOFFSET; | |
1571 | mov(&dest, call.addr, sizeof(call.addr)); | |
1572 | iwrite(&call, pc, sizeof(call)); | |
1573 | setreg(PROGCTR, pc); | |
1574 | pstep(process, DEFSIG); | |
1575 | iwrite(save, pc, sizeof(save)); | |
1576 | pc = reg(PROGCTR); | |
1577 | if (not isbperr()) { | |
1578 | printstatus(); | |
1579 | } | |
1580 | /* | |
1581 | * Execute link instruction so the return addr is visible. | |
1582 | */ | |
1583 | pstep(process, DEFSIG); | |
1584 | pc = reg(PROGCTR); | |
1585 | if (not isbperr()) { | |
1586 | printstatus(); | |
1587 | } | |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | * Special variables for debugging the kernel. | |
1592 | */ | |
1593 | ||
1594 | public integer masterpcbb; | |
1595 | public integer slr; | |
1596 | public struct pte *sbr; | |
1597 | private struct pcb pcb; | |
1598 | ||
1599 | public getpcb () | |
1600 | { | |
1601 | integer i; | |
1602 | ||
1603 | fseek(corefile, masterpcbb & ~0x80000000, 0); | |
1604 | get(corefile, pcb); | |
1605 | pcb.pcb_p0lr &= ~AST_CLR; | |
1606 | printf("p0br %lx p0lr %lx p1br %lx p1lr %lx\n", | |
1607 | pcb.pcb_p0br, pcb.pcb_p0lr, pcb.pcb_p1br, pcb.pcb_p1lr | |
1608 | ); | |
1609 | # ifdef sun | |
1610 | for (i = 0; i < 14; i++) { | |
1611 | setreg(i, pcb.pcb_regs.val[i]); | |
1612 | } | |
1613 | # else /* IRIS */ | |
1614 | for (i = 0; i < 14; i++) { | |
1615 | setreg(i, pcb.pcb_regs[i]); | |
1616 | } | |
1617 | # endif | |
1618 | } | |
1619 | ||
1620 | public copyregs (savreg, reg) | |
1621 | Word savreg[], reg[]; | |
1622 | { | |
1623 | reg[0] = savreg[R0]; | |
1624 | reg[1] = savreg[R1]; | |
1625 | reg[2] = savreg[R2]; | |
1626 | reg[3] = savreg[R3]; | |
1627 | reg[4] = savreg[R4]; | |
1628 | reg[5] = savreg[R5]; | |
1629 | reg[6] = savreg[R6]; | |
1630 | reg[7] = savreg[R7]; | |
1631 | reg[8] = savreg[AR0]; | |
1632 | reg[9] = savreg[AR1]; | |
1633 | reg[10] = savreg[AR2]; | |
1634 | reg[11] = savreg[AR3]; | |
1635 | reg[12] = savreg[AR4]; | |
1636 | reg[13] = savreg[AR5]; | |
1637 | reg[14] = savreg[AR6]; | |
1638 | reg[15] = savreg[AR7]; | |
1639 | reg[PROGCTR] = savreg[PC]; | |
1640 | } | |
1641 | ||
1642 | /* | |
1643 | * Map a virtual address to a physical address. | |
1644 | * XXX THIS CAN'T BE RIGHT... XXX | |
1645 | */ | |
1646 | ||
1647 | public Address vmap (addr) | |
1648 | Address addr; | |
1649 | { | |
1650 | Address r; | |
1651 | integer v, n; | |
1652 | struct pte pte; | |
1653 | ||
1654 | r = addr & ~0xc0000000; | |
1655 | v = btop(r); | |
1656 | switch (addr&0xc0000000) { | |
1657 | case 0xc0000000: | |
1658 | case 0x80000000: | |
1659 | /* | |
1660 | * In system space, so get system pte. | |
1661 | * If it is valid or reclaimable then the physical address | |
1662 | * is the combination of its page number and the page offset | |
1663 | * of the original address. | |
1664 | */ | |
1665 | if (v >= slr) { | |
1666 | error("address %x out of segment", addr); | |
1667 | } | |
1668 | r = ((long) (sbr + v)) & ~0x80000000; | |
1669 | goto simple; | |
1670 | ||
1671 | case 0x40000000: | |
1672 | /* | |
1673 | * In p1 space, must not be in shadow region. | |
1674 | */ | |
1675 | if (v < pcb.pcb_p1lr) { | |
1676 | error("address %x out of segment", addr); | |
1677 | } | |
1678 | r = (Address) (pcb.pcb_p1br + v); | |
1679 | break; | |
1680 | ||
1681 | case 0x00000000: | |
1682 | /* | |
1683 | * In p0 space, must not be off end of region. | |
1684 | */ | |
1685 | if (v >= pcb.pcb_p0lr) { | |
1686 | error("address %x out of segment", addr); | |
1687 | } | |
1688 | r = (Address) (pcb.pcb_p0br + v); | |
1689 | break; | |
1690 | ||
1691 | default: | |
1692 | /* do nothing */ | |
1693 | break; | |
1694 | } | |
1695 | /* | |
1696 | * For p0/p1 address, user-level page table should be in | |
1697 | * kernel virtual memory. Do second-level indirect by recursing. | |
1698 | */ | |
1699 | if ((r & 0x80000000) == 0) { | |
1700 | error("bad p0br or p1br in pcb"); | |
1701 | } | |
1702 | r = vmap(r); | |
1703 | simple: | |
1704 | /* | |
1705 | * "r" is now the address of the pte of the page | |
1706 | * we are interested in; get the pte and paste up the physical address. | |
1707 | */ | |
1708 | fseek(corefile, r, 0); | |
1709 | n = fread(&pte, sizeof(pte), 1, corefile); | |
1710 | if (n != 1) { | |
1711 | error("page table botch (fread at %x returns %d)", r, n); | |
1712 | } | |
1713 | if (pte.pg_v == 0 and (pte.pg_fod != 0 or pte.pg_pfnum == 0)) { | |
1714 | error("page no valid or reclamable"); | |
1715 | } | |
1716 | return (addr&PGOFSET) + ((Address) ptob(pte.pg_pfnum)); | |
1717 | } | |
1718 | ||
1719 | /* | |
1720 | * Extract a bit field from an integer. | |
1721 | */ | |
1722 | ||
1723 | public integer extractField (s) | |
1724 | Symbol s; | |
1725 | { | |
1726 | integer nbytes, nbits, n, r, off, len; | |
1727 | ||
1728 | off = s->symvalue.field.offset; | |
1729 | len = s->symvalue.field.length; | |
1730 | nbytes = size(s); | |
1731 | n = 0; | |
1732 | if (nbytes > sizeof(n)) { | |
1733 | printf("[bad size in extractField -- word assumed]\n"); | |
1734 | nbytes = sizeof(n); | |
1735 | } | |
1736 | popn(nbytes, ((char *) &n) + (sizeof(Word) - nbytes)); | |
1737 | nbits = nbytes * BITSPERBYTE; | |
1738 | r = n >> (nbits - ((off mod nbits) + len)); | |
1739 | r &= ((1 << len) - 1); | |
1740 | return r; | |
1741 | } | |
1742 | ||
1743 | /* | |
1744 | * Change the length of a value in memory according to a given difference | |
1745 | * in the lengths of its new and old types. | |
1746 | */ | |
1747 | ||
1748 | public loophole (oldlen, newlen) | |
1749 | integer oldlen, newlen; | |
1750 | { | |
1751 | integer i, n; | |
1752 | Stack *oldsp; | |
1753 | ||
1754 | n = newlen - oldlen; | |
1755 | oldsp = sp - oldlen; | |
1756 | if (n > 0) { | |
1757 | for (i = oldlen - 1; i >= 0; i--) { | |
1758 | oldsp[n + i] = oldsp[i]; | |
1759 | } | |
1760 | for (i = 0; i < n; i++) { | |
1761 | oldsp[i] = '\0'; | |
1762 | } | |
1763 | } else { | |
1764 | for (i = 0; i < newlen; i++) { | |
1765 | oldsp[i] = oldsp[i - n]; | |
1766 | } | |
1767 | } | |
1768 | sp += n; | |
1769 | } |