Commit | Line | Data |
---|---|---|
9a3bab7a ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
ca69b757 | 3 | static char sccsid[] = "@(#)process.c 1.11 %G%"; |
9a3bab7a ML |
4 | |
5 | /* | |
6 | * Process management. | |
7 | * | |
8 | * This module contains the routines to manage the execution and | |
9 | * tracing of the debuggee process. | |
10 | */ | |
11 | ||
12 | #include "defs.h" | |
13 | #include "process.h" | |
14 | #include "machine.h" | |
15 | #include "events.h" | |
16 | #include "tree.h" | |
17 | #include "operators.h" | |
18 | #include "source.h" | |
19 | #include "object.h" | |
20 | #include "mappings.h" | |
21 | #include "main.h" | |
22 | #include "coredump.h" | |
23 | #include <signal.h> | |
24 | #include <errno.h> | |
25 | #include <sys/param.h> | |
b0edae1c | 26 | #include <machine/reg.h> |
9a3bab7a ML |
27 | #include <sys/stat.h> |
28 | ||
29 | #ifndef public | |
30 | ||
31 | typedef struct Process *Process; | |
32 | ||
33 | Process process; | |
34 | ||
35 | #include "machine.h" | |
36 | ||
37 | #endif | |
38 | ||
39 | #define NOTSTARTED 1 | |
40 | #define STOPPED 0177 | |
41 | #define FINISHED 0 | |
42 | ||
43 | /* | |
44 | * Cache-ing of instruction segment is done to reduce the number | |
45 | * of system calls. | |
46 | */ | |
47 | ||
48 | #define CSIZE 1003 /* size of instruction cache */ | |
49 | ||
50 | typedef struct { | |
51 | Word addr; | |
52 | Word val; | |
53 | } CacheWord; | |
54 | ||
55 | /* | |
56 | * This structure holds the information we need from the user structure. | |
57 | */ | |
58 | ||
59 | struct Process { | |
60 | int pid; /* process being traced */ | |
5870175c ML |
61 | int mask; /* process status word */ |
62 | Word reg[NREG]; /* process' registers */ | |
9a3bab7a ML |
63 | Word oreg[NREG]; /* registers when process last stopped */ |
64 | short status; /* either STOPPED or FINISHED */ | |
65 | short signo; /* signal that stopped process */ | |
66 | int exitval; /* return value from exit() */ | |
67 | long sigset; /* bit array of traced signals */ | |
68 | CacheWord word[CSIZE]; /* text segment cache */ | |
5870175c | 69 | Ttyinfo ttyinfo; /* process' terminal characteristics */ |
9a3bab7a ML |
70 | }; |
71 | ||
72 | /* | |
73 | * These definitions are for the arguments to "pio". | |
74 | */ | |
75 | ||
76 | typedef enum { PREAD, PWRITE } PioOp; | |
77 | typedef enum { TEXTSEG, DATASEG } PioSeg; | |
78 | ||
79 | private struct Process pbuf; | |
80 | ||
e1abecb0 | 81 | #define MAXNCMDARGS 100 /* maximum number of arguments to RUN */ |
9a3bab7a | 82 | |
ca69b757 ML |
83 | extern int errno; |
84 | ||
9a3bab7a ML |
85 | private Boolean just_started; |
86 | private int argc; | |
87 | private String argv[MAXNCMDARGS]; | |
88 | private String infile, outfile; | |
89 | ||
90 | /* | |
91 | * Initialize process information. | |
92 | */ | |
93 | ||
94 | public process_init() | |
95 | { | |
96 | register Integer i; | |
97 | Char buf[10]; | |
98 | ||
99 | process = &pbuf; | |
100 | process->status = (coredump) ? STOPPED : NOTSTARTED; | |
101 | setsigtrace(); | |
102 | for (i = 0; i < NREG; i++) { | |
103 | sprintf(buf, "$r%d", i); | |
104 | defregname(identname(buf, false), i); | |
105 | } | |
106 | defregname(identname("$ap", true), ARGP); | |
107 | defregname(identname("$fp", true), FRP); | |
108 | defregname(identname("$sp", true), STKP); | |
109 | defregname(identname("$pc", true), PROGCTR); | |
110 | if (coredump) { | |
111 | coredump_readin(process->mask, process->reg, process->signo); | |
4e067a2c ML |
112 | pc = process->reg[PROGCTR]; |
113 | getsrcpos(); | |
9a3bab7a | 114 | } |
4e067a2c | 115 | arginit(); |
9a3bab7a ML |
116 | } |
117 | ||
118 | /* | |
119 | * Routines to get at process information from outside this module. | |
120 | */ | |
121 | ||
122 | public Word reg(n) | |
123 | Integer n; | |
124 | { | |
125 | register Word w; | |
126 | ||
127 | if (n == NREG) { | |
128 | w = process->mask; | |
129 | } else { | |
130 | w = process->reg[n]; | |
131 | } | |
132 | return w; | |
133 | } | |
134 | ||
135 | public setreg(n, w) | |
136 | Integer n; | |
137 | Word w; | |
138 | { | |
139 | process->reg[n] = w; | |
140 | } | |
141 | ||
142 | /* | |
143 | * Begin execution. | |
144 | * | |
145 | * We set a breakpoint at the end of the code so that the | |
146 | * process data doesn't disappear after the program terminates. | |
147 | */ | |
148 | ||
149 | private Boolean remade(); | |
150 | ||
151 | public start(argv, infile, outfile) | |
152 | String argv[]; | |
153 | String infile, outfile; | |
154 | { | |
155 | String pargv[4]; | |
156 | Node cond; | |
157 | ||
158 | if (coredump) { | |
159 | coredump = false; | |
160 | fclose(corefile); | |
161 | coredump_close(); | |
162 | } | |
163 | if (argv == nil) { | |
164 | argv = pargv; | |
165 | pargv[0] = objname; | |
166 | pargv[1] = nil; | |
167 | } else { | |
168 | argv[argc] = nil; | |
169 | } | |
170 | if (remade(objname)) { | |
171 | reinit(argv, infile, outfile); | |
172 | } | |
173 | pstart(process, argv, infile, outfile); | |
174 | if (process->status == STOPPED) { | |
175 | pc = 0; | |
176 | curfunc = program; | |
177 | if (objsize != 0) { | |
178 | cond = build(O_EQ, build(O_SYM, pcsym), build(O_LCON, lastaddr())); | |
179 | event_once(cond, buildcmdlist(build(O_ENDX))); | |
180 | } | |
181 | } | |
182 | } | |
183 | ||
184 | /* | |
185 | * Check to see if the object file has changed since the symbolic | |
186 | * information last was read. | |
187 | */ | |
188 | ||
189 | private time_t modtime; | |
190 | ||
191 | private Boolean remade(filename) | |
192 | String filename; | |
193 | { | |
194 | struct stat s; | |
195 | Boolean b; | |
196 | ||
197 | stat(filename, &s); | |
198 | b = (Boolean) (modtime != 0 and modtime < s.st_mtime); | |
199 | modtime = s.st_mtime; | |
200 | return b; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Set up what signals we want to trace. | |
205 | */ | |
206 | ||
207 | private setsigtrace() | |
208 | { | |
209 | register Integer i; | |
210 | register Process p; | |
211 | ||
212 | p = process; | |
213 | for (i = 1; i <= NSIG; i++) { | |
214 | psigtrace(p, i, true); | |
215 | } | |
216 | psigtrace(p, SIGHUP, false); | |
217 | psigtrace(p, SIGKILL, false); | |
218 | psigtrace(p, SIGALRM, false); | |
219 | psigtrace(p, SIGTSTP, false); | |
220 | psigtrace(p, SIGCONT, false); | |
221 | psigtrace(p, SIGCHLD, false); | |
222 | } | |
223 | ||
224 | /* | |
225 | * Initialize the argument list. | |
226 | */ | |
227 | ||
228 | public arginit() | |
229 | { | |
230 | infile = nil; | |
231 | outfile = nil; | |
232 | argv[0] = objname; | |
233 | argc = 1; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Add an argument to the list for the debuggee. | |
238 | */ | |
239 | ||
240 | public newarg(arg) | |
241 | String arg; | |
242 | { | |
243 | if (argc >= MAXNCMDARGS) { | |
244 | error("too many arguments"); | |
245 | } | |
246 | argv[argc++] = arg; | |
247 | } | |
248 | ||
249 | /* | |
250 | * Set the standard input for the debuggee. | |
251 | */ | |
252 | ||
253 | public inarg(filename) | |
254 | String filename; | |
255 | { | |
256 | if (infile != nil) { | |
257 | error("multiple input redirects"); | |
258 | } | |
259 | infile = filename; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Set the standard output for the debuggee. | |
264 | * Probably should check to avoid overwriting an existing file. | |
265 | */ | |
266 | ||
267 | public outarg(filename) | |
268 | String filename; | |
269 | { | |
270 | if (outfile != nil) { | |
271 | error("multiple output redirect"); | |
272 | } | |
273 | outfile = filename; | |
274 | } | |
275 | ||
276 | /* | |
277 | * Start debuggee executing. | |
278 | */ | |
279 | ||
280 | public run() | |
281 | { | |
282 | process->status = STOPPED; | |
283 | fixbps(); | |
284 | curline = 0; | |
285 | start(argv, infile, outfile); | |
286 | just_started = true; | |
287 | isstopped = false; | |
288 | cont(); | |
289 | } | |
290 | ||
291 | /* | |
292 | * Continue execution wherever we left off. | |
293 | * | |
294 | * Note that this routine never returns. Eventually bpact() will fail | |
295 | * and we'll call printstatus or step will call it. | |
296 | */ | |
297 | ||
298 | typedef int Intfunc(); | |
299 | ||
300 | private Intfunc *dbintr; | |
301 | private intr(); | |
302 | ||
303 | #define succeeds == true | |
304 | #define fails == false | |
305 | ||
36fd36ba ML |
306 | public cont(signo) |
307 | int signo; | |
9a3bab7a ML |
308 | { |
309 | dbintr = signal(SIGINT, intr); | |
310 | if (just_started) { | |
311 | just_started = false; | |
312 | } else { | |
313 | if (not isstopped) { | |
314 | error("can't continue execution"); | |
315 | } | |
316 | isstopped = false; | |
36fd36ba | 317 | stepover(); |
9a3bab7a ML |
318 | } |
319 | for (;;) { | |
320 | if (single_stepping) { | |
321 | printnews(); | |
322 | } else { | |
323 | setallbps(); | |
36fd36ba | 324 | resume(signo); |
9a3bab7a ML |
325 | unsetallbps(); |
326 | if (bpact() fails) { | |
327 | printstatus(); | |
328 | } | |
329 | } | |
36fd36ba | 330 | stepover(); |
9a3bab7a ML |
331 | } |
332 | /* NOTREACHED */ | |
333 | } | |
334 | ||
335 | /* | |
336 | * This routine is called if we get an interrupt while "running" px | |
337 | * but actually in the debugger. Could happen, for example, while | |
338 | * processing breakpoints. | |
339 | * | |
340 | * We basically just want to keep going; the assumption is | |
341 | * that when the process resumes it will get the interrupt | |
342 | * which will then be handled. | |
343 | */ | |
344 | ||
345 | private intr() | |
346 | { | |
347 | signal(SIGINT, intr); | |
348 | } | |
349 | ||
350 | public fixintr() | |
351 | { | |
352 | signal(SIGINT, dbintr); | |
353 | } | |
354 | ||
355 | /* | |
356 | * Resume execution. | |
357 | */ | |
358 | ||
36fd36ba ML |
359 | public resume(signo) |
360 | int signo; | |
9a3bab7a ML |
361 | { |
362 | register Process p; | |
363 | ||
364 | p = process; | |
365 | if (traceexec) { | |
366 | printf("execution resumes at pc 0x%x\n", process->reg[PROGCTR]); | |
367 | fflush(stdout); | |
368 | } | |
36fd36ba | 369 | pcont(p, signo); |
9a3bab7a ML |
370 | pc = process->reg[PROGCTR]; |
371 | if (traceexec) { | |
372 | printf("execution stops at pc 0x%x on sig %d\n", | |
373 | process->reg[PROGCTR], p->signo); | |
374 | fflush(stdout); | |
375 | } | |
e0a80343 | 376 | if (p->status != STOPPED) { |
36fd36ba ML |
377 | if (p->signo != 0) { |
378 | error("program terminated by signal %d", p->signo); | |
379 | } else { | |
380 | error("program unexpectedly exited with %d", p->exitval); | |
381 | } | |
e0a80343 | 382 | } |
9a3bab7a ML |
383 | } |
384 | ||
385 | /* | |
386 | * Continue execution up to the next source line. | |
387 | * | |
388 | * There are two ways to define the next source line depending on what | |
389 | * is desired when a procedure or function call is encountered. Step | |
390 | * stops at the beginning of the procedure or call; next skips over it. | |
391 | */ | |
392 | ||
393 | /* | |
394 | * Stepc is what is called when the step command is given. | |
395 | * It has to play with the "isstopped" information. | |
396 | */ | |
397 | ||
398 | public stepc() | |
399 | { | |
400 | if (not isstopped) { | |
401 | error("can't continue execution"); | |
402 | } | |
403 | isstopped = false; | |
404 | dostep(false); | |
405 | isstopped = true; | |
406 | } | |
407 | ||
408 | public next() | |
409 | { | |
410 | if (not isstopped) { | |
411 | error("can't continue execution"); | |
412 | } | |
413 | isstopped = false; | |
414 | dostep(true); | |
415 | isstopped = true; | |
416 | } | |
417 | ||
36fd36ba ML |
418 | /* |
419 | * Single-step over the current machine instruction. | |
420 | * | |
421 | * If we're single-stepping by source line we want to step to the | |
422 | * next source line. Otherwise we're going to continue so there's | |
423 | * no reason to do all the work necessary to single-step to the next | |
424 | * source line. | |
425 | */ | |
426 | ||
427 | private stepover() | |
9a3bab7a | 428 | { |
36fd36ba ML |
429 | Boolean b; |
430 | ||
431 | if (single_stepping) { | |
432 | dostep(false); | |
433 | } else { | |
434 | b = inst_tracing; | |
435 | inst_tracing = true; | |
436 | dostep(false); | |
437 | inst_tracing = b; | |
438 | } | |
9a3bab7a ML |
439 | } |
440 | ||
441 | /* | |
442 | * Resume execution up to the given address. It is assumed that | |
443 | * no breakpoints exist between the current address and the one | |
444 | * we're stepping to. This saves us from setting all the breakpoints. | |
445 | */ | |
446 | ||
447 | public stepto(addr) | |
448 | Address addr; | |
449 | { | |
450 | setbp(addr); | |
36fd36ba | 451 | resume(0); |
9a3bab7a ML |
452 | unsetbp(addr); |
453 | if (not isbperr()) { | |
454 | printstatus(); | |
455 | } | |
456 | } | |
457 | ||
458 | /* | |
459 | * Print the status of the process. | |
460 | * This routine does not return. | |
461 | */ | |
462 | ||
463 | public printstatus() | |
464 | { | |
ca69b757 ML |
465 | int status; |
466 | ||
b0edae1c ML |
467 | if (process->status == FINISHED) { |
468 | exit(0); | |
9a3bab7a | 469 | } else { |
b0edae1c ML |
470 | curfunc = whatblock(pc); |
471 | getsrcpos(); | |
472 | if (process->signo == SIGINT) { | |
473 | isstopped = true; | |
474 | printerror(); | |
475 | } else if (isbperr() and isstopped) { | |
476 | printf("stopped "); | |
86d0cc79 ML |
477 | printloc(); |
478 | putchar('\n'); | |
b0edae1c | 479 | if (curline > 0) { |
b0edae1c ML |
480 | printlines(curline, curline); |
481 | } else { | |
b0edae1c ML |
482 | printinst(pc, pc); |
483 | } | |
484 | erecover(); | |
9a3bab7a | 485 | } else { |
b0edae1c ML |
486 | fixbps(); |
487 | fixintr(); | |
9a3bab7a ML |
488 | isstopped = true; |
489 | printerror(); | |
490 | } | |
491 | } | |
492 | } | |
493 | ||
86d0cc79 ML |
494 | /* |
495 | * Print out the current location in the debuggee. | |
496 | */ | |
497 | ||
498 | public printloc() | |
499 | { | |
500 | printf("in "); | |
501 | printname(stdout, curfunc); | |
502 | putchar(' '); | |
503 | if (curline > 0) { | |
504 | printsrcpos(); | |
505 | } else { | |
506 | printf("at 0x%x", pc); | |
507 | } | |
508 | } | |
509 | ||
9a3bab7a ML |
510 | /* |
511 | * Some functions for testing the state of the process. | |
512 | */ | |
513 | ||
514 | public Boolean notstarted(p) | |
515 | Process p; | |
516 | { | |
517 | return (Boolean) (p->status == NOTSTARTED); | |
518 | } | |
519 | ||
520 | public Boolean isfinished(p) | |
521 | Process p; | |
522 | { | |
523 | return (Boolean) (p->status == FINISHED); | |
524 | } | |
525 | ||
526 | /* | |
527 | * Return the signal number which stopped the process. | |
528 | */ | |
529 | ||
530 | public Integer errnum(p) | |
531 | Process p; | |
532 | { | |
533 | return p->signo; | |
534 | } | |
535 | ||
536 | /* | |
537 | * Return the termination code of the process. | |
538 | */ | |
539 | ||
540 | public Integer exitcode(p) | |
541 | Process p; | |
542 | { | |
543 | return p->exitval; | |
544 | } | |
545 | ||
546 | /* | |
547 | * These routines are used to access the debuggee process from | |
548 | * outside this module. | |
549 | * | |
550 | * They invoke "pio" which eventually leads to a call to "ptrace". | |
ae743e15 ML |
551 | * The system generates an I/O error when a ptrace fails, we assume |
552 | * during a read/write to the process that such an error is due to | |
553 | * a misguided address and ignore it. | |
9a3bab7a ML |
554 | */ |
555 | ||
556 | extern Intfunc *onsyserr(); | |
557 | ||
558 | private badaddr; | |
559 | private rwerr(); | |
560 | ||
561 | /* | |
562 | * Read from the process' instruction area. | |
563 | */ | |
564 | ||
565 | public iread(buff, addr, nbytes) | |
566 | char *buff; | |
567 | Address addr; | |
568 | int nbytes; | |
569 | { | |
570 | Intfunc *f; | |
571 | ||
572 | f = onsyserr(EIO, rwerr); | |
573 | badaddr = addr; | |
574 | if (coredump) { | |
575 | coredump_readtext(buff, addr, nbytes); | |
576 | } else { | |
577 | pio(process, PREAD, TEXTSEG, buff, addr, nbytes); | |
578 | } | |
579 | onsyserr(EIO, f); | |
580 | } | |
581 | ||
582 | /* | |
583 | * Write to the process' instruction area, usually in order to set | |
584 | * or unset a breakpoint. | |
585 | */ | |
586 | ||
587 | public iwrite(buff, addr, nbytes) | |
588 | char *buff; | |
589 | Address addr; | |
590 | int nbytes; | |
591 | { | |
592 | Intfunc *f; | |
593 | ||
594 | if (coredump) { | |
595 | error("no process to write to"); | |
596 | } | |
597 | f = onsyserr(EIO, rwerr); | |
598 | badaddr = addr; | |
599 | pio(process, PWRITE, TEXTSEG, buff, addr, nbytes); | |
600 | onsyserr(EIO, f); | |
601 | } | |
602 | ||
603 | /* | |
604 | * Read for the process' data area. | |
605 | */ | |
606 | ||
607 | public dread(buff, addr, nbytes) | |
608 | char *buff; | |
609 | Address addr; | |
610 | int nbytes; | |
611 | { | |
612 | Intfunc *f; | |
613 | ||
614 | f = onsyserr(EIO, rwerr); | |
615 | badaddr = addr; | |
616 | if (coredump) { | |
617 | coredump_readdata(buff, addr, nbytes); | |
618 | } else { | |
619 | pio(process, PREAD, DATASEG, buff, addr, nbytes); | |
620 | } | |
621 | onsyserr(EIO, f); | |
622 | } | |
623 | ||
624 | /* | |
625 | * Write to the process' data area. | |
626 | */ | |
627 | ||
628 | public dwrite(buff, addr, nbytes) | |
629 | char *buff; | |
630 | Address addr; | |
631 | int nbytes; | |
632 | { | |
633 | Intfunc *f; | |
634 | ||
635 | if (coredump) { | |
636 | error("no process to write to"); | |
637 | } | |
638 | f = onsyserr(EIO, rwerr); | |
639 | badaddr = addr; | |
640 | pio(process, PWRITE, DATASEG, buff, addr, nbytes); | |
641 | onsyserr(EIO, f); | |
642 | } | |
643 | ||
644 | /* | |
645 | * Error handler. | |
646 | */ | |
647 | ||
648 | private rwerr() | |
649 | { | |
ae743e15 ML |
650 | /* |
651 | * Current response is to ignore the error and let the result | |
652 | * (-1) ripple back up to the process. | |
653 | * | |
9a3bab7a | 654 | error("bad read/write process address 0x%x", badaddr); |
ae743e15 | 655 | */ |
9a3bab7a ML |
656 | } |
657 | ||
658 | /* | |
659 | * Ptrace interface. | |
660 | */ | |
661 | ||
662 | /* | |
663 | * This magic macro enables us to look at the process' registers | |
664 | * in its user structure. Very gross. | |
665 | */ | |
666 | ||
667 | #define regloc(reg) (ctob(UPAGES) + ( sizeof(int) * (reg) )) | |
668 | ||
669 | #define WMASK (~(sizeof(Word) - 1)) | |
670 | #define cachehash(addr) ((unsigned) ((addr >> 2) % CSIZE)) | |
671 | ||
672 | #define FIRSTSIG SIGINT | |
673 | #define LASTSIG SIGQUIT | |
674 | #define ischild(pid) ((pid) == 0) | |
675 | #define traceme() ptrace(0, 0, 0, 0) | |
676 | #define setrep(n) (1 << ((n)-1)) | |
677 | #define istraced(p) (p->sigset&setrep(p->signo)) | |
678 | ||
679 | /* | |
680 | * Ptrace options (specified in first argument). | |
681 | */ | |
682 | ||
683 | #define UREAD 3 /* read from process's user structure */ | |
684 | #define UWRITE 6 /* write to process's user structure */ | |
685 | #define IREAD 1 /* read from process's instruction space */ | |
686 | #define IWRITE 4 /* write to process's instruction space */ | |
687 | #define DREAD 2 /* read from process's data space */ | |
688 | #define DWRITE 5 /* write to process's data space */ | |
689 | #define CONT 7 /* continue stopped process */ | |
690 | #define SSTEP 9 /* continue for approximately one instruction */ | |
691 | #define PKILL 8 /* terminate the process */ | |
692 | ||
693 | /* | |
694 | * Start up a new process by forking and exec-ing the | |
695 | * given argument list, returning when the process is loaded | |
696 | * and ready to execute. The PROCESS information (pointed to | |
697 | * by the first argument) is appropriately filled. | |
698 | * | |
699 | * If the given PROCESS structure is associated with an already running | |
700 | * process, we terminate it. | |
701 | */ | |
702 | ||
703 | /* VARARGS2 */ | |
704 | private pstart(p, argv, infile, outfile) | |
705 | Process p; | |
706 | String argv[]; | |
707 | String infile; | |
708 | String outfile; | |
709 | { | |
710 | int status; | |
ca69b757 | 711 | Fileid in, out; |
9a3bab7a ML |
712 | |
713 | if (p->pid != 0) { /* child already running? */ | |
714 | ptrace(PKILL, p->pid, 0, 0); /* ... kill it! */ | |
ca69b757 ML |
715 | pwait(p->pid, &status); /* wait for it to exit */ |
716 | unptraced(p->pid); | |
9a3bab7a ML |
717 | } |
718 | psigtrace(p, SIGTRAP, true); | |
ca69b757 ML |
719 | p->pid = vfork(); |
720 | if (p->pid == -1) { | |
9a3bab7a ML |
721 | panic("can't fork"); |
722 | } | |
723 | if (ischild(p->pid)) { | |
724 | traceme(); | |
725 | if (infile != nil) { | |
86d0cc79 ML |
726 | in = open(infile, 0); |
727 | if (in == -1) { | |
728 | write(2, "can't read ", 11); | |
729 | write(2, infile, strlen(infile)); | |
730 | write(2, "\n", 1); | |
731 | _exit(1); | |
9a3bab7a | 732 | } |
86d0cc79 | 733 | fswap(0, in); |
9a3bab7a ML |
734 | } |
735 | if (outfile != nil) { | |
86d0cc79 ML |
736 | out = creat(outfile, 0666); |
737 | if (out == -1) { | |
738 | write(2, "can't write ", 12); | |
739 | write(2, outfile, strlen(outfile)); | |
740 | write(2, "\n", 1); | |
741 | _exit(1); | |
9a3bab7a | 742 | } |
86d0cc79 | 743 | fswap(1, out); |
9a3bab7a | 744 | } |
e0a80343 | 745 | execv(argv[0], argv); |
86d0cc79 ML |
746 | write(2, "can't exec ", 11); |
747 | write(2, argv[0], strlen(argv[0])); | |
748 | write(2, "\n", 1); | |
749 | _exit(1); | |
9a3bab7a ML |
750 | } |
751 | pwait(p->pid, &status); | |
752 | getinfo(p, status); | |
753 | if (p->status != STOPPED) { | |
754 | error("program could not begin execution"); | |
755 | } | |
ca69b757 | 756 | ptraced(p->pid); |
9a3bab7a ML |
757 | } |
758 | ||
759 | /* | |
36fd36ba ML |
760 | * Continue a stopped process. The first argument points to a Process |
761 | * structure. Before the process is restarted it's user area is modified | |
762 | * according to the values in the structure. When this routine finishes, | |
9a3bab7a ML |
763 | * the structure has the new values from the process's user area. |
764 | * | |
765 | * Pcont terminates when the process stops with a signal pending that | |
766 | * is being traced (via psigtrace), or when the process terminates. | |
767 | */ | |
768 | ||
36fd36ba | 769 | private pcont(p, signo) |
9a3bab7a | 770 | Process p; |
36fd36ba | 771 | int signo; |
9a3bab7a ML |
772 | { |
773 | int status; | |
774 | ||
775 | if (p->pid == 0) { | |
776 | error("program not active"); | |
777 | } | |
778 | do { | |
36fd36ba | 779 | setinfo(p, signo); |
9a3bab7a ML |
780 | sigs_off(); |
781 | if (ptrace(CONT, p->pid, p->reg[PROGCTR], p->signo) < 0) { | |
ca69b757 | 782 | panic("error %d trying to continue process", errno); |
9a3bab7a ML |
783 | } |
784 | pwait(p->pid, &status); | |
785 | sigs_on(); | |
786 | getinfo(p, status); | |
787 | } while (p->status == STOPPED and not istraced(p)); | |
788 | } | |
789 | ||
790 | /* | |
791 | * Single step as best ptrace can. | |
792 | */ | |
793 | ||
794 | public pstep(p) | |
795 | Process p; | |
796 | { | |
797 | int status; | |
798 | ||
36fd36ba | 799 | setinfo(p, 0); |
9a3bab7a ML |
800 | sigs_off(); |
801 | ptrace(SSTEP, p->pid, p->reg[PROGCTR], p->signo); | |
802 | pwait(p->pid, &status); | |
803 | sigs_on(); | |
804 | getinfo(p, status); | |
805 | } | |
806 | ||
807 | /* | |
808 | * Return from execution when the given signal is pending. | |
809 | */ | |
810 | ||
811 | public psigtrace(p, sig, sw) | |
812 | Process p; | |
813 | int sig; | |
814 | Boolean sw; | |
815 | { | |
816 | if (sw) { | |
817 | p->sigset |= setrep(sig); | |
818 | } else { | |
819 | p->sigset &= ~setrep(sig); | |
820 | } | |
821 | } | |
822 | ||
823 | /* | |
824 | * Don't catch any signals. | |
825 | * Particularly useful when letting a process finish uninhibited. | |
826 | */ | |
827 | ||
828 | public unsetsigtraces(p) | |
829 | Process p; | |
830 | { | |
831 | p->sigset = 0; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Turn off attention to signals not being caught. | |
836 | */ | |
837 | ||
838 | private Intfunc *sigfunc[NSIG]; | |
839 | ||
840 | private sigs_off() | |
841 | { | |
842 | register int i; | |
843 | ||
844 | for (i = FIRSTSIG; i < LASTSIG; i++) { | |
845 | if (i != SIGKILL) { | |
846 | sigfunc[i] = signal(i, SIG_IGN); | |
847 | } | |
848 | } | |
849 | } | |
850 | ||
851 | /* | |
852 | * Turn back on attention to signals. | |
853 | */ | |
854 | ||
855 | private sigs_on() | |
856 | { | |
857 | register int i; | |
858 | ||
859 | for (i = FIRSTSIG; i < LASTSIG; i++) { | |
860 | if (i != SIGKILL) { | |
861 | signal(i, sigfunc[i]); | |
862 | } | |
863 | } | |
864 | } | |
865 | ||
866 | /* | |
867 | * Get process information from user area. | |
868 | */ | |
869 | ||
870 | private int rloc[] ={ | |
871 | R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, AP, FP, SP, PC | |
872 | }; | |
873 | ||
874 | private getinfo(p, status) | |
875 | register Process p; | |
876 | register int status; | |
877 | { | |
878 | register int i; | |
879 | ||
880 | p->signo = (status&0177); | |
881 | p->exitval = ((status >> 8)&0377); | |
882 | if (p->signo != STOPPED) { | |
883 | p->status = FINISHED; | |
884 | } else { | |
885 | p->status = p->signo; | |
886 | p->signo = p->exitval; | |
887 | p->exitval = 0; | |
888 | p->mask = ptrace(UREAD, p->pid, regloc(PS), 0); | |
889 | for (i = 0; i < NREG; i++) { | |
890 | p->reg[i] = ptrace(UREAD, p->pid, regloc(rloc[i]), 0); | |
891 | p->oreg[i] = p->reg[i]; | |
892 | } | |
5870175c | 893 | savetty(stdout, &(p->ttyinfo)); |
9a3bab7a ML |
894 | } |
895 | } | |
896 | ||
897 | /* | |
898 | * Set process's user area information from given process structure. | |
899 | */ | |
900 | ||
36fd36ba | 901 | private setinfo(p, signo) |
9a3bab7a | 902 | register Process p; |
36fd36ba | 903 | int signo; |
9a3bab7a ML |
904 | { |
905 | register int i; | |
906 | register int r; | |
907 | ||
908 | if (istraced(p)) { | |
36fd36ba | 909 | p->signo = signo; |
9a3bab7a ML |
910 | } |
911 | for (i = 0; i < NREG; i++) { | |
912 | if ((r = p->reg[i]) != p->oreg[i]) { | |
913 | ptrace(UWRITE, p->pid, regloc(rloc[i]), r); | |
914 | } | |
915 | } | |
5870175c | 916 | restoretty(stdout, &(p->ttyinfo)); |
9a3bab7a ML |
917 | } |
918 | ||
919 | /* | |
920 | * Structure for reading and writing by words, but dealing with bytes. | |
921 | */ | |
922 | ||
923 | typedef union { | |
924 | Word pword; | |
925 | Byte pbyte[sizeof(Word)]; | |
926 | } Pword; | |
927 | ||
928 | /* | |
929 | * Read (write) from (to) the process' address space. | |
930 | * We must deal with ptrace's inability to look anywhere other | |
931 | * than at a word boundary. | |
932 | */ | |
933 | ||
934 | private Word fetch(); | |
935 | private store(); | |
936 | ||
937 | private pio(p, op, seg, buff, addr, nbytes) | |
938 | Process p; | |
939 | PioOp op; | |
940 | PioSeg seg; | |
941 | char *buff; | |
942 | Address addr; | |
943 | int nbytes; | |
944 | { | |
945 | register int i; | |
946 | register Address newaddr; | |
947 | register char *cp; | |
948 | char *bufend; | |
949 | Pword w; | |
950 | Address wordaddr; | |
951 | int byteoff; | |
952 | ||
953 | if (p->status != STOPPED) { | |
954 | error("program is not active"); | |
955 | } | |
956 | cp = buff; | |
957 | newaddr = addr; | |
958 | wordaddr = (newaddr&WMASK); | |
959 | if (wordaddr != newaddr) { | |
960 | w.pword = fetch(p, seg, wordaddr); | |
961 | for (i = newaddr - wordaddr; i < sizeof(Word) and nbytes > 0; i++) { | |
962 | if (op == PREAD) { | |
963 | *cp++ = w.pbyte[i]; | |
964 | } else { | |
965 | w.pbyte[i] = *cp++; | |
966 | } | |
967 | nbytes--; | |
968 | } | |
969 | if (op == PWRITE) { | |
970 | store(p, seg, wordaddr, w.pword); | |
971 | } | |
972 | newaddr = wordaddr + sizeof(Word); | |
973 | } | |
974 | byteoff = (nbytes&(~WMASK)); | |
975 | nbytes -= byteoff; | |
976 | bufend = cp + nbytes; | |
977 | while (cp < bufend) { | |
978 | if (op == PREAD) { | |
979 | *((Word *) cp) = fetch(p, seg, newaddr); | |
980 | } else { | |
981 | store(p, seg, newaddr, *((Word *) cp)); | |
982 | } | |
983 | cp += sizeof(Word); | |
984 | newaddr += sizeof(Word); | |
985 | } | |
986 | if (byteoff > 0) { | |
987 | w.pword = fetch(p, seg, newaddr); | |
988 | for (i = 0; i < byteoff; i++) { | |
989 | if (op == PREAD) { | |
990 | *cp++ = w.pbyte[i]; | |
991 | } else { | |
992 | w.pbyte[i] = *cp++; | |
993 | } | |
994 | } | |
995 | if (op == PWRITE) { | |
996 | store(p, seg, newaddr, w.pword); | |
997 | } | |
998 | } | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Get a word from a process at the given address. | |
1003 | * The address is assumed to be on a word boundary. | |
1004 | * | |
1005 | * A simple cache scheme is used to avoid redundant ptrace calls | |
1006 | * to the instruction space since it is assumed to be pure. | |
1007 | * | |
1008 | * It is necessary to use a write-through scheme so that | |
1009 | * breakpoints right next to each other don't interfere. | |
1010 | */ | |
1011 | ||
1012 | private Integer nfetchs, nreads, nwrites; | |
1013 | ||
1014 | private Word fetch(p, seg, addr) | |
1015 | Process p; | |
1016 | PioSeg seg; | |
1017 | register int addr; | |
1018 | { | |
1019 | register CacheWord *wp; | |
1020 | register Word w; | |
1021 | ||
1022 | switch (seg) { | |
1023 | case TEXTSEG: | |
1024 | ++nfetchs; | |
1025 | wp = &p->word[cachehash(addr)]; | |
1026 | if (addr == 0 or wp->addr != addr) { | |
1027 | ++nreads; | |
1028 | w = ptrace(IREAD, p->pid, addr, 0); | |
1029 | wp->addr = addr; | |
1030 | wp->val = w; | |
1031 | } else { | |
1032 | w = wp->val; | |
1033 | } | |
1034 | break; | |
1035 | ||
1036 | case DATASEG: | |
1037 | w = ptrace(DREAD, p->pid, addr, 0); | |
1038 | break; | |
1039 | ||
1040 | default: | |
1041 | panic("fetch: bad seg %d", seg); | |
1042 | /* NOTREACHED */ | |
1043 | } | |
1044 | return w; | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Put a word into the process' address space at the given address. | |
1049 | * The address is assumed to be on a word boundary. | |
1050 | */ | |
1051 | ||
1052 | private store(p, seg, addr, data) | |
1053 | Process p; | |
1054 | PioSeg seg; | |
1055 | int addr; | |
1056 | Word data; | |
1057 | { | |
1058 | register CacheWord *wp; | |
1059 | ||
1060 | switch (seg) { | |
1061 | case TEXTSEG: | |
1062 | ++nwrites; | |
1063 | wp = &p->word[cachehash(addr)]; | |
1064 | wp->addr = addr; | |
1065 | wp->val = data; | |
1066 | ptrace(IWRITE, p->pid, addr, data); | |
1067 | break; | |
1068 | ||
1069 | case DATASEG: | |
1070 | ptrace(DWRITE, p->pid, addr, data); | |
1071 | break; | |
1072 | ||
1073 | default: | |
1074 | panic("store: bad seg %d", seg); | |
1075 | /* NOTREACHED */ | |
1076 | } | |
1077 | } | |
1078 | ||
1079 | public printptraceinfo() | |
1080 | { | |
1081 | printf("%d fetchs, %d reads, %d writes\n", nfetchs, nreads, nwrites); | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * Swap file numbers so as to redirect standard input and output. | |
1086 | */ | |
1087 | ||
1088 | private fswap(oldfd, newfd) | |
1089 | int oldfd; | |
1090 | int newfd; | |
1091 | { | |
1092 | if (oldfd != newfd) { | |
1093 | close(oldfd); | |
1094 | dup(newfd); | |
1095 | close(newfd); | |
1096 | } | |
1097 | } |