source: trunk/minix/commands/mdb/mdb.c@ 16

Last change on this file since 16 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 22.4 KB
RevLine 
[9]1/*
2 * mdb.c - MINIX program debugger
3 *
4 * Written by Bruce D. Szablak
5 *
6 * This free software is provided for non-commerical use. No warrantee
7 * of fitness for any use is implied. You get what you pay for. Anyone
8 * may make modifications and distribute them, but please keep this header
9 * in the distribution.
10 */
11
12/*
13 * Originally ported to MINIX-PC and MINIX-386 by Bruce Evans.
14 * NB: the original sym.c and mdbdis86.c come from his 'db'
15 *
16 * Added by Philip Murton:
17 *
18 * 2.0 'Core' file functions
19 * 2.1 Support for GNU exec
20 * 2.2 Changes for Minix 1.6.x Beta
21 * 2.3 Changes for Minix 1.7.0 and trace syscalls
22 * 2.4 Changes for Minix 1.7.2 and clean up
23 * 2.5.1 Add better help
24 * 2.5.2 Added io.c for logging options
25 * 2.5.3 Minor changes and tested with Minix 1.7.4
26 * 2.5.4 Command arguments processing improved (Thanks to Will Rose)
27 * 2.6.0 Final Version for MINIX CD (Sept/96)
28 */
29
30#define _MAIN_MDB
31#include "mdb.h"
32
33#include <minix/type.h>
34
35#include <stdio.h>
36#include <signal.h>
37#include <string.h>
38#include <stdlib.h>
39#include <unistd.h>
40#include <ctype.h>
41#include <errno.h>
42#include <sys/wait.h>
43#define ptrace mdbtrace
44#include <sys/ptrace.h>
45#include <setjmp.h>
46#include "proto.h"
47
48#include <kernel/const.h>
49#include <kernel/type.h>
50#include <kernel/proc.h>
51
52/* buffer for proc and pointer to proc */
53extern struct proc *prc;
54
55#define MAXLINE 128
56#define MAXARG 20
57
58PRIVATE unsigned long lastexp = 0L; /* last expression and segment */
59PRIVATE int lastseg = NOSEG;
60PRIVATE char *prog; /* prog name */
61PRIVATE char sbuf[MAXLINE];
62PRIVATE char cbuf[MAXLINE];
63PRIVATE char *cmd; /* current command */
64PRIVATE char *cmdstart; /* start of command */
65PRIVATE jmp_buf mainlp;
66
67
68struct b_pnt {
69 struct b_pnt *nxt, *prv;
70 long addr;
71 long oldval;
72 char cmd[1];
73} *b_head, *curpnt;
74
75_PROTOTYPE( void main , (int argc, char *argv[]));
76
77FORWARD _PROTOTYPE( void cleanup , (void));
78FORWARD _PROTOTYPE( void freepnt , (struct b_pnt *pnt ));
79FORWARD _PROTOTYPE( void findbpnt , (int verbose ));
80FORWARD _PROTOTYPE( int exebpnt , (int restart ));
81FORWARD _PROTOTYPE( void catch , (int sig ));
82FORWARD _PROTOTYPE( int run , (char *name , char *argstr , int tflg ));
83FORWARD _PROTOTYPE( int dowait , (void));
84FORWARD _PROTOTYPE( void backtrace , (int all ));
85FORWARD _PROTOTYPE( void modify , (long addr , int cnt , int verbose , int size ));
86FORWARD _PROTOTYPE( void display , (long addr , int req ));
87FORWARD _PROTOTYPE( void fill , (long addr , int req ));
88FORWARD _PROTOTYPE( void dorun , (char *cmd ));
89FORWARD _PROTOTYPE( void not_for_core , (void));
90FORWARD _PROTOTYPE( void command , (void));
91
92
93PRIVATE void cleanup()
94{
95 curpid = 0;
96 curpnt = NULL;
97 while (b_head) freepnt(b_head);
98}
99
100PRIVATE void findbpnt(verbose)
101int verbose;
102{
103 for (curpnt = b_head; curpnt; curpnt = curpnt->nxt) {
104 if (curpnt->addr == PC_MEMBER(prc) - BREAKPOINT_ADVANCE) {
105 ptrace(T_SETINS, curpid, curpnt->addr, curpnt->oldval);
106 ptrace(T_SETUSER, curpid, PC_OFF, curpnt->addr);
107#if SYSCALLS_SUPPORT
108 if( syscalls )
109 do_syscall(curpnt->addr);
110 else if (curpnt->cmd[0] != '\n')
111#else
112 if (curpnt->cmd[0] != '\n')
113#endif
114 cmd = strcpy(cbuf, curpnt->cmd);
115 else if (verbose)
116 Printf("Breakpoint hit.\n");
117 return;
118 }
119 }
120 if (verbose) Printf("Unknown breakpoint hit.\n");
121}
122
123PRIVATE int exebpnt(restart)
124int restart;
125{
126 ptrace(T_STEP, curpid, 0L, (long) restart);
127 if (dowait() == 0) return TRUE;
128 ptrace(T_SETINS, curpid, curpnt->addr, BREAK(curpnt->oldval));
129 curpnt = NULL;
130 return FALSE;
131}
132
133
134PRIVATE void freepnt(pnt)
135struct b_pnt *pnt;
136{
137 if (pnt->prv)
138 pnt->prv->nxt = pnt->nxt;
139 else
140 b_head = pnt->nxt;
141 if (pnt->nxt) pnt->nxt->prv = pnt->prv;
142 if (curpid > 0) ptrace(T_SETINS, curpid, pnt->addr, pnt->oldval);
143 free(pnt);
144 if (pnt == curpnt) curpnt = NULL;
145}
146
147
148PUBLIC long breakpt(addr, cmd)
149long addr;
150char *cmd;
151{
152 struct b_pnt *new;
153
154 if (curpid <= 0) {
155 Printf("No active process.\n");
156 return 0L;
157 }
158 for (new = b_head; new; new = new->nxt)
159 if (new->addr == addr) {
160 Printf("Breakpoint already exists here.\n");
161 return 0L;
162 }
163 new = (struct b_pnt *) malloc(sizeof(struct b_pnt) + strlen(cmd));
164 if (new == NULL) {
165 Printf("No room for new breakpoint.\n");
166 return 0L;
167 }
168 new->nxt = b_head;
169 new->prv = 0;
170 if (b_head) b_head->prv = new;
171 b_head = new;
172 new->addr = addr;
173 strcpy(new->cmd, cmd);
174 new->oldval = ptrace(T_GETINS, curpid, addr, 0L);
175 ptrace(T_SETINS, curpid, addr, BREAK(new->oldval));
176 if (ptrace(T_GETINS, curpid, addr, 0L) != BREAK(new->oldval)) {
177 do_error("Can't set breakpoint");
178 freepnt(new);
179 return 0L;
180 }
181 return new->oldval;
182}
183
184PRIVATE void catch(sig)
185int sig;
186{
187 signal(sig, catch);
188 if (sig == SIGINT || sig == SIGQUIT) return;
189 tstart(T_EXIT, 0, sig, 0);
190 exit(0);
191}
192
193
194PRIVATE int dowait()
195{
196 int stat;
197
198 if (corepid > 0) return cursig = 0;
199 while (wait(&stat) != curpid) {};
200 if ( WIFEXITED(stat) ) {
201 if (WEXITSTATUS(stat) != 127)
202 Printf("child exited with status %d\n", WEXITSTATUS(stat));
203 cleanup();
204 return 0;
205 }
206 if ( WIFSIGNALED(stat) ) {
207 Printf("child terminated by signal %d\n", WTERMSIG(stat) );
208 if (_LOW(stat) & 0x80) Printf("(core dumped)\n");
209 cleanup();
210 return 0;
211 }
212 return cursig = WSTOPSIG(stat);
213}
214
215
216
217PUBLIC void tstart(req, verbose, val, cnt)
218int req, verbose, val, cnt;
219{
220 if (curpid == 0) {
221 if (verbose) Printf("No active process.\n");
222 return;
223 }
224 if (req == T_EXIT) {
225 ptrace(T_EXIT, curpid, 0L, (long) val);
226 dowait();
227 return;
228 }
229 if (cnt == 0) cnt = 1;
230 do {
231 if (curpnt) {
232 if (exebpnt(val)) return;
233 if (req == T_RESUME) cnt++;
234 val = 0;
235 } else {
236 ptrace(req, curpid, 0L, (long) val);
237 if (dowait() == 0) return;
238 val = 0;
239 switch (cursig) {
240 case SIGEMT: /* breakpoint */
241 update();
242 findbpnt(cnt <= 1);
243 break;
244 case SIGTRAP: /* trace trap? */
245 if (req == T_STEP) break;
246 default: /* signal */
247 val = cursig;
248 break;
249 }
250 }
251 }
252 while (--cnt > 0);
253 update();
254 if ( verbose ) dasm((long) PC_MEMBER(prc), 1, 1);
255}
256
257PRIVATE int run(name, argstr, tflg)
258char *name, *argstr;
259int tflg;
260{
261 int procid;
262 char *argv[MAXARG], *inf = NULL, *outf = NULL;
263 int argc;
264
265 if ((procid = fork()) == 0) {
266 /* trace me */
267 if (tflg) ptrace(T_OK, 0, 0L, 0L);
268 argv[0] = name;
269 for (argc = 1;;) {
270 argstr = skip(argstr);
271 if (*argstr == '\n' || *argstr == ';') {
272 argv[argc] = 0;
273 if (inf) freopen(inf, "r", stdin);
274 if (outf) freopen(outf, "w", stdout);
275 if (tflg) {
276 execv(name, argv);
277 do_error("execv");
278 } else {
279 execvp(name, argv);
280 do_error("execvp");
281 }
282 exit(127);
283 }
284 if (*argstr == '<')
285 inf = argstr + 1;
286 else if (*argstr == '>')
287 outf = argstr + 1;
288 else if (argc == MAXARG) {
289 Printf("Too many arguments.\n");
290 exit(127);
291 } else
292 argv[argc++] = argstr;
293 while (!isspace(*argstr)) argstr++;
294 if (*argstr == '\n') argstr[1] = '\n', argstr[2] = 0;
295 *argstr++ = 0;
296 }
297 }
298 if (procid < 0) do_error("Fork failed.\n");
299 return procid;
300}
301
302
303PRIVATE void dorun(cmd)
304char *cmd;
305{
306 if (curpid = run(prog, cmd, 1)) {
307 if (dowait()) {
308 ptrace(T_SETUSER, curpid, BP_OFF, 0L);
309 update();
310 Printf("Process stopped.\n");
311 }
312 }
313}
314
315/*
316 * backtrace - inspect the stack
317 */
318PRIVATE void backtrace(all)
319int all;
320{
321 unsigned long pc, bp, off, val, obp;
322
323 if (curpid <= 0) {
324 Printf("No process.\n");
325 return;
326 }
327 pc = get_reg(curpid,PC_OFF);
328 bp = get_reg(curpid,BP_OFF);
329 if (bp == 0) {
330 Printf("No active frame.\n");
331 return;
332 }
333 errno = 0;
334 do {
335 symbolic(pc, '(');
336 pc = (ptrace(T_GETDATA, curpid, bp + ADDRSIZE, 0L)
337 >> SHIFT(ADDRSIZE)) & MASK(ADDRSIZE);
338 off = ptrace(T_GETINS, curpid, pc, 0L);
339#ifdef DEBUG
340 if(debug)
341 Printf("Return address %lx Value %lx\n",pc,off);
342#endif
343 obp = bp;
344 bp += 2 * ADDRSIZE;
345
346 /* Check for various instruction used to restore the stack.
347 * Should gives us the number of arguments.
348 * This is obvious dependent on interal features of the
349 * compiler used.
350 */
351 if (ADDQ(off)) off = ADDQ_CNT(off) + bp;
352#ifdef __mc68000__
353 else if (LEA(off))
354 off = LEA_DISP(off) + bp;
355#endif
356 else if (ADDA(off))
357 off = ADDA_CNT(ptrace(T_GETINS, curpid, pc + 2, 0L)) + bp;
358#if (CHIP == INTEL)
359 else if (INCSP2(off))
360 off = bp + 2*INTSIZE;
361 else if (POPBX2(off))
362 off = bp + 2*INTSIZE;
363 else if (POPCX2(off))
364 off = bp + 2*INTSIZE;
365 else if (POPBX(off))
366 off = bp + INTSIZE;
367 else if (POPCX(off))
368 off = bp + INTSIZE;
369#endif
370 else
371 goto skiplp;
372
373#ifdef DEBUG
374 if (debug)
375 Printf("Number of arguments: %d\n",(off-bp)/INTSIZE);
376#endif
377
378 for (;;) {
379 if (errno) return;
380 val = (ptrace(T_GETDATA, curpid, bp, 0L)
381 >> SHIFT(INTSIZE)) & MASK(INTSIZE);
382 Printf("0x%0*lx", 2 * INTSIZE, val);
383 bp += INTSIZE;
384 if (bp >= off) break;
385 Printf(",");
386 }
387
388skiplp:
389 Printf(")\n");
390 bp = (long) ( (reg_t) ptrace(T_GETDATA, curpid, obp, 0L) );
391#ifdef DEBUG
392 if(debug)
393 Printf("Old BP %lx New %lx\n",obp,bp);
394#endif
395 }
396 while (all && (reg_t) bp);
397}
398
399PRIVATE void modify(addr, cnt, verbose, size)
400long addr;
401int cnt, verbose, size;
402{
403 long curval, off;
404
405 if (curpid == 0) {
406 Printf("No active process.\n");
407 return;
408 }
409 curval = ptrace(T_GETDATA, curpid, addr, 0L) & MASK(size);
410 do {
411 if (cursig == SIGTRAP) cursig = 0;
412 if (verbose) {
413 off = get_reg(curpid, PC_OFF);
414 dasm(off, 1, 0);
415 }
416 if (curpnt && exebpnt(cursig))
417 return;
418 else {
419 ptrace(T_STEP, curpid, addr, 0L);
420 switch (dowait()) {
421 case 0:
422 return;
423 case SIGEMT:
424 update();
425 findbpnt(0);
426 break;
427 }
428 }
429 if (curval != ptrace(T_GETDATA, curpid, addr, 0L) & MASK(size)) {
430 Printf("Modification detected\n");
431 break;
432 }
433 }
434 while (--cnt);
435 update();
436 dasm((long) PC_MEMBER(prc), 1, 1);
437 return;
438}
439
440PRIVATE void display(addr, req)
441long addr;
442int req;
443{
444 int count, size, out, shift;
445 long val, msk;
446 char fmt;
447
448 if (curpid == 0) {
449 Printf("No active process\n");
450 return;
451 }
452 if (req == T_GETDATA && seg == T) req = T_GETINS;
453 count = strtol(cmd, &cmd, 0);
454 if (count == 0) count = 1;
455 cmd = skip(cmd);
456 if (*cmd == 'i' || *cmd == 'I') {
457 dasm(addr, count, *cmd == 'i');
458 return;
459 }
460 if (*cmd == 'y') {
461 symbolic(addr, '\n');
462 return;
463 }
464 switch (*cmd++) {
465 case 'b': size = sizeof(char); break;
466 case 'h': size = sizeof(short); break;
467 case 'l': size = sizeof(long); break;
468 default:
469 size = sizeof(int);
470 --cmd;
471 break;
472 }
473 switch (fmt = *cmd) {
474 case 'X':
475 case 'D':
476 size = sizeof(long);
477 break;
478 case 's':
479 addr = ptrace(req, curpid, addr, 0L);
480 req = T_GETDATA;
481 /* Fallthrough */
482 case 'a':
483 case 'c':
484 size = sizeof(char);
485 break;
486 }
487 out = 0;
488 msk = MASK(size);
489 shift = SHIFT(size);
490 do {
491 val = (ptrace(req, curpid, addr, 0L) >> shift) & msk;
492 if (out == 0) Printf("\n0x%0*lx: ", 2 * ADDRSIZE,
493 (addr >> SHIFT(ADDRSIZE)) & MASK(ADDRSIZE));
494 switch (fmt) {
495 case 'c':
496 Printf(isprint((int) (UCHAR(val))) ? " %c " : "\\%03o ",
497 (int) (UCHAR(val)));
498 if (++out == 8) out = 0;
499 break;
500 case 'u':
501 Printf("%12lu ", val);
502 if (++out == 4) out = 0;
503 break;
504 case 'x':
505 case 'X':
506 Printf("%*lx ", 2 * size, val);
507 if (++out == (size == 4 ? 4 : 8)) out = 0;
508 break;
509 case 'o':
510 Printf("%*lo ", 3 * size, val);
511 if (++out == (size == 4 ? 4 : 8)) out = 0;
512 break;
513 case 's':
514 case 'a':
515 if (val)
516 Printf("%c",val);
517 else
518 goto exitlp;
519 if (++out == 64) out = 0;
520 break;
521 default:
522 case 'd':
523 case 'D':
524 Printf("%12ld ", val);
525 if (++out == 4) out = 0;
526 break;
527 }
528 addr += size;
529 }
530 while (--count > 0 || fmt == 's' || fmt == 'a');
531exitlp:
532 Printf("\n");
533}
534
535PRIVATE void fill(addr, req)
536long addr;
537int req;
538{
539 int count, size, shift;
540 long val, msk, nval;
541
542 if (curpid == 0) {
543 Printf("No active process\n");
544 return;
545 }
546
547 if (req == T_GETDATA && seg == T) {
548 req = T_GETINS;
549 Printf("mdb: warning - modifying text\n");
550 }
551 count = strtol(cmd, &cmd, 0);
552 if ( count == 0 ) count = 1;
553 switch (*cmd++) {
554 case 'b': size = sizeof(char); break;
555 case 'h': size = sizeof(short); break;
556 case 'l': size = sizeof(long); break;
557 default:
558 size = sizeof(int);
559 --cmd;
560 break;
561 }
562 shift = SHIFT(size);
563 msk = MASK(size);
564 cmd = getexp(cmd, &nval, &seg);
565
566#ifdef DEBUG
567 if (debug)
568 Printf("Filling for Count=%d Size=%d val=%lx\n",count,size,nval);
569#endif
570
571 nval <<= shift;
572 do {
573 val = ptrace(req, curpid, addr, 0L) | (nval & msk);
574 val &= (nval | ~msk);
575 ptrace(req + 3, curpid, addr, val);
576 addr += size;
577 }
578 while (--count > 0);
579}
580
581PRIVATE void not_for_core()
582{
583 if (corepid > 0)
584 mdb_error("Illegal command for 'core' file\n");
585}
586
587PRIVATE void command()
588{
589 char c, *p;
590 int i;
591 int size;
592 int stat;
593 long exp, lj, lk;
594 struct b_pnt *bp;
595
596 seg = NOSEG; /* don't restrict segment expressions are in */
597 cmdstart = cmd = skip(cmd);
598 cmd = getexp(cmd, &exp, &seg);
599
600 if (cmd == cmdstart) {
601 /* Not an expression */
602 if (corepid < 0) { /* default to pc for running processs */
603 seg = T;
604 exp = PC_MEMBER(prc);
605 } else {
606 seg = lastseg;
607 exp = lastexp;
608 }
609
610 /* Is it a help command */
611 cmd = skip(cmd+1);
612 if (*cmd == '?') {
613 help_on(*cmdstart);
614 *cmd = '\n';
615 return;
616 }
617 else
618 cmd = cmdstart;
619 }
620
621 if (seg == NOSEG) seg = T; /* Absolute becomes Text */
622 lastexp = exp; /* save last expression */
623 lastseg = seg;
624#ifdef DEBUG
625 if(debug)
626 Printf("Current address 0x%0*lx and segment %d\n", 2 * ADDRSIZE, exp, seg);
627
628#endif
629
630 /* Check commands */
631 switch (c = *cmd++) {
632 case 'r': /* illegal for 'core' files */
633 case 'R':
634 case 'k':
635 case 'B':
636 case 'd':
637 case 'D': not_for_core();
638 break;
639
640 case 'b': /* illegal for 'core' files */
641 case 'c': /* Otherwise run process first */
642 case 'C':
643 case 'm':
644 case 'M':
645#if SYSCALLS_SUPPORT
646 case 'z':
647#endif
648 case 'i':
649 case 'I': not_for_core();
650 if (curpid <= 0) dorun("\n");
651 break;
652
653 case 's': if (curpid <= 0) dorun("\n");
654 break;
655
656 default: break;
657 }
658
659 switch (c) {
660 case '!': /* escape to shell */
661 if (cmd == cmdstart + 1) {
662 cmd = skip(cmd);
663 if (*cmd == '\n' || *cmd == ';') {
664 i = run("/bin/sh", "\n", 0);
665 } else {
666 for (p = cmd + 1; *p && !isspace(*p); p++) {
667 };
668 *p++ = 0;
669 i = run(cmd, *p ? p : "\n", 0);
670 }
671 if (i > 0) while (wait(&stat) != i) {};
672 break;
673 }
674 if (corepid > 0) longjmp(mainlp, 0);
675 break;
676 case 'T': /* top line of backtrace */
677 backtrace(0);
678 break;
679 case 't': /* back trace */
680 backtrace(1);
681 break;
682 case '/': /* print variable value */
683 display(exp, T_GETDATA);
684 break;
685 case 'x': /* print registers and instruction */
686 if (disp_regs()) break;
687 /* FALLTHROUGH */
688 case 'X': /* print instruction - X n [, n] */
689 lj = strtol(cmd, &cmd, 0);
690 lk = 0;
691 if (*cmd != '\0')
692 lk = strtol(++cmd, &cmd, 0);
693 if (curpid > 0)
694 dasm(exp + lk, lj ? lj : 1, 1);
695 else
696 Printf("No active process.\n");
697 break;
698 case 'R': /* run program with no args */
699 case 'r': /* run program with args (possibly defaulted) */
700 tstart(T_EXIT, 0, 0, 0);
701 if (c == 'r') {
702 cmd = skip(cmd);
703 if (*cmd == '\n' || *cmd == ';')
704 cmd = sbuf;
705 else
706 strcpy(sbuf, cmd);
707 } else {
708 cmd = "\n";
709 }
710 dorun(cmd);
711 break;
712 case 'c': /* continue program - ignore signal */
713 cursig = 0;
714 case 'C': /* continue program - handle signal */
715 i = 0;
716 if (seg == T && curpnt == 0 && cmd != cmdstart + 1) {
717 breakpt(exp, "\n");
718 curpnt = b_head;
719 ptrace(T_SETINS, curpid, curpnt->addr, curpnt->oldval);
720 i = 1;
721 }
722 tstart(T_RESUME, 1, cursig, (int) strtol(cmd, &cmd, 0));
723 /* remove temporary bp */
724 if (i) freepnt(b_head);
725 if (cursig == SIGEMT) return;
726 if (curpid) Printf("Process stopped by signal %d\n", cursig);
727 break;
728 case 'i': /* single step - ignore signal */
729 tstart(T_STEP, 1, 0, (int) strtol(cmd, &cmd, 0));
730 break;
731 case 'I': /* single step - handle signal */
732 tstart(T_STEP, 1, cursig, (int) strtol(cmd, &cmd, 0));
733 break;
734 case 'm': /* single step until location modified */
735 case 'M': /* single step until location modified - verbose */
736 cmd = skip(cmd);
737 switch (*cmd++) {
738 case 'b': size = sizeof(char); break;
739 case 'h': size = sizeof(short); break;
740 case 'l': size = sizeof(long); break;
741 default:
742 size = sizeof(int);
743 --cmd;
744 break;
745 }
746 modify(exp, (int) strtol(cmd, &cmd, 0), c == 'M', size);
747 break;
748 case 'k': /* kill current program */
749 tstart(T_EXIT, 1, 0, 0);
750 break;
751 case 'b': /* set a breakpoint at the given line */
752#ifdef MINIX_PC
753 if (seg != T || exp > end_addr ) {
754#else
755 if (seg != T || exp < st_addr || exp > et_addr ) {
756#endif
757 Printf("Address not in text space.\n");
758 return;
759 }
760 breakpt(exp, skip(cmd));
761 cmd = "\n";
762 return;
763 case 'B': /* print list of currently active breakpoints */
764 for (i = 1, bp = b_head; bp; bp = bp->nxt, i++) {
765 Printf("%2d: ", i);
766 symbolic((long) bp->addr, '\t');
767 Printf("(0x%lx)\t- %s", bp->addr, bp->cmd);
768 }
769 break;
770 case 'd': /* delete breakpoint */
771 if (seg == T) {
772 for (bp = b_head; bp && bp->addr != exp; bp = bp->nxt);
773 if (bp) {
774 freepnt(bp);
775 break;
776 }
777 }
778 Printf("No such breakpoint.\n");
779 break;
780 case 'D': /* delete all breakpoints */
781 while (b_head) freepnt(b_head);
782 break;
783 case 's':
784 dump_stack( strtol(cmd, &cmd, 0) );
785 break;
786 case 'P':
787 paging = !paging;
788 if (paging) Printf("Paging is ON\n");
789 break;
790 case 'l':
791 case 'L':
792 logging(c,skip(cmd));
793 break;
794#if SYSCALLS_SUPPORT
795 case 'z':
796 start_syscall( strtol(cmd, &cmd, 0) );
797 if ( syscalls )
798 Printf("Break point set - use the 'c n' command\n");
799 break;
800#endif
801 case 'q': /* quit */
802 tstart(T_EXIT, 0, 0, 0);
803 logging(c,cmd);
804 case 'Q':
805 exit(0);
806 break;
807 case '\n':
808 case ';':
809 if (isdigit(*cmdstart))
810 symbolic(exp, '\n');
811 else
812 Printf("0x%0*lx\n", 2 * ADDRSIZE, exp);
813 --cmd;
814 break;
815#ifdef DEBUG
816 case 'v': /* toggle debug */
817 debug = !debug;
818 if (debug) Printf("Debug flag ON\n");
819 break;
820#endif
821 case 'e': /* list symbols */
822 listsym(cmd);
823 break;
824 case 'y': /* print mapping */
825 prtmap();
826 break;
827 case '?': /* print help */
828 help_page();
829 break;
830 case 'V': /* print version info */
831 version_info();
832 break;
833 case '@': /* command file */
834 cmd = skip(cmd);
835 openin(cmd);
836 *cmd = '\n';
837 return;
838 case '#': /* set register or variable */
839 cmd = skip(cmd + 1);
840 if (*cmd == '$') {
841 cmd++;
842 i = reg_addr(cmd);
843 set_reg(curpid, i, strtol(cmd+2, &cmd, 0) );
844 update();
845 break;
846 }
847 cmd = getexp(cmd, &exp, &seg);
848 fill(exp, T_GETDATA);
849 break;
850 default:
851 help_page();
852 break;
853 }
854 while (*cmd != '\n' && *cmd != ';') ++cmd;
855 if (*cmd == ';') cmd = skip(cmd + 1);
856}
857
858PUBLIC void mdb_error(s)
859char *s;
860{
861 Printf("%s",s);
862 longjmp(mainlp, 0);
863}
864
865PUBLIC void main(argc, argv)
866int argc;
867char *argv[];
868{
869 int i, c;
870 char *p, *q, *r;
871 int opt_c = FALSE; /* load core file */
872 int opt_f = FALSE; /* load object file */
873 int opt_l = FALSE; /* log to file */
874 int opt_L = FALSE; /* log to file and screen */
875
876
877 prc = (struct proc *) lbuf;
878 strcpy(sbuf, "\n");
879 corepid = -1; /* set to indicate none */
880 prog = p = q = r = NULL;
881
882 if ( argc == 1 )
883 {
884 help_page();
885 exit(0);
886 }
887
888 /* Possible combinations of arguments:
889 * A single file name:
890 * If the name is 'core', the coreonly flag is set.
891 * The -c flag: examine a core file.
892 * One filename is required with this flag.
893 * The -f flag: examine an object file.
894 * One file name is required with this flag.
895 * The -L or -l flag: write to a log file.
896 * One file name is required with these flags.
897 * The -x flag: turn on debugging.
898 * Used for debugging, and followed by an integer
899 * argument which is the debugging level.
900 *
901 * If any files remain on the argument list, the first
902 * file is an executable, and the second a core file.
903 * If any filename starts with '@' it is assumed to
904 * to be a command file. Only one command file is
905 * loaded.
906 */
907
908 /* check for default file name and fake out getopt */
909 if (strcmp(argv[1], "core") == 0) {
910 for (i = argc ; i > 1 ; i--)
911 argv[i] = argv[i - 1];
912 argv[i] = "-c";
913 argc++;
914 }
915
916 /* parse options */
917 opterr = 0;
918 while ((i = getopt(argc, argv, "c:f:L:l:x:")) != EOF) {
919 switch (i & 0377) {
920 case 'c': /* examine a core file */
921 if (opt_c == TRUE || opt_f == TRUE) {
922 help_page();
923 exit(1);
924 }
925 p = optarg;
926 opt_c = TRUE;
927 break;
928 case 'f': /* examine an object file */
929 if (opt_c == TRUE || opt_f == TRUE) {
930 help_page();
931 exit(1);
932 }
933 p = optarg;
934 opt_f = TRUE;
935 break;
936 case 'l': /* start logging */
937 if (opt_l == TRUE || opt_L == TRUE) {
938 help_page();
939 exit(1);
940 }
941 opt_l = TRUE;
942 logging(i, optarg);
943 break;
944 case 'L': /* start logging */
945 if (opt_l == TRUE || opt_L == TRUE) {
946 help_page();
947 exit(1);
948 }
949 opt_L = TRUE;
950 logging(i, optarg);
951 break;
952#ifdef DEBUG
953 case 'x': /* set debug level */
954 debug = atoi(optarg);
955 break;
956#endif
957 case '?': /* default arguments arrive here */
958 default:
959 help_page();
960 exit(1);
961 }
962 }
963
964 /* can't cope without filenames */
965 if (!opt_c && !opt_f && optind >= argc) {
966 help_page();
967 exit(1);
968 }
969
970 /* any remaining arguments are (optional) file names */
971 for (i = optind ; i < argc ; i++) {
972 if (*argv[i] == '@') { /* command file */
973 if (r == NULL) r = argv[i] + 1;
974 }
975 /* you can't combine a -c or -f object file and a core file */
976 else if (!opt_c && !opt_f && p == NULL) p = argv[i];
977 else if (q == NULL) q = argv[i]; /* core file */
978 }
979
980 /* initialise stuff - fairly tricky logic */
981 coreonly = opt_c;
982 fileonly = opt_f;
983 /* when examining files, prog == NULL */
984 if (!opt_c && !opt_f) {
985 prog = p;
986 syminit(prog);
987 }
988
989 /* file_init is called for non-core files.
990 * It is very similar to core_init. It opens the file and set
991 * various pointers so that we can read it using the same routines
992 * as a core file.
993 * NB: Currently there is no special provision to handle object files.
994 */
995
996 /* A comment from Will Rose:
997 * It would be nice to have
998 * symbol tables available when reading a core
999 * or a.out, either as part of the executable or
1000 * as a separate file.
1001 * At least three separate types of file structure
1002 * may be used by mdb - core files, a.out files, and
1003 * object files (which may have several flavours).
1004 * A set of routines is needed for each type, with
1005 * a function switch table initialised when mdb is
1006 * started up.
1007 */
1008
1009 if (opt_c) lastexp = core_init(p);
1010 if (opt_f) lastexp = file_init(p);
1011 if (q != NULL) lastexp = core_init(q);
1012 if (r != NULL) openin(r);
1013 for (i = 1; i < _NSIG; i++) signal(i, catch);
1014
1015 setjmp(mainlp);
1016
1017 while (get_cmd( cbuf, MAXLINE ) != NULL) {
1018 if (strlen(cbuf) == sizeof(cbuf) - 1) {
1019 Printf("Command line too long.\n");
1020 continue;
1021 }
1022 cmd = cbuf;
1023 command();
1024 while (*cmd != '\n') command();
1025 }
1026 tstart(T_EXIT, 0, 0, 0);
1027 exit(0);
1028}
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