Commit | Line | Data |
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2a24676e DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
9a3bab7a | 6 | |
2a24676e | 7 | #ifndef lint |
ca6575f0 | 8 | static char sccsid[] = "@(#)process.c 5.2 (Berkeley) %G%"; |
2a24676e | 9 | #endif not lint |
0022c355 ML |
10 | |
11 | static char rcsid[] = "$Header: process.c,v 1.5 84/12/26 10:41:37 linton Exp $"; | |
9a3bab7a ML |
12 | |
13 | /* | |
14 | * Process management. | |
15 | * | |
16 | * This module contains the routines to manage the execution and | |
17 | * tracing of the debuggee process. | |
18 | */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "process.h" | |
22 | #include "machine.h" | |
23 | #include "events.h" | |
24 | #include "tree.h" | |
8ee6535a | 25 | #include "eval.h" |
9a3bab7a ML |
26 | #include "operators.h" |
27 | #include "source.h" | |
28 | #include "object.h" | |
29 | #include "mappings.h" | |
30 | #include "main.h" | |
31 | #include "coredump.h" | |
32 | #include <signal.h> | |
33 | #include <errno.h> | |
9a3bab7a ML |
34 | #include <sys/stat.h> |
35 | ||
36 | #ifndef public | |
37 | ||
38 | typedef struct Process *Process; | |
39 | ||
40 | Process process; | |
41 | ||
8ee6535a ML |
42 | #define DEFSIG -1 |
43 | ||
9a3bab7a ML |
44 | #include "machine.h" |
45 | ||
46 | #endif | |
47 | ||
48 | #define NOTSTARTED 1 | |
49 | #define STOPPED 0177 | |
50 | #define FINISHED 0 | |
51 | ||
52 | /* | |
2fd0f574 SL |
53 | * A cache of the instruction segment is kept to reduce the number |
54 | * of system calls. Might be better just to read the entire | |
55 | * code space into memory. | |
9a3bab7a ML |
56 | */ |
57 | ||
58 | #define CSIZE 1003 /* size of instruction cache */ | |
59 | ||
60 | typedef struct { | |
61 | Word addr; | |
62 | Word val; | |
63 | } CacheWord; | |
64 | ||
65 | /* | |
66 | * This structure holds the information we need from the user structure. | |
67 | */ | |
68 | ||
69 | struct Process { | |
70 | int pid; /* process being traced */ | |
5870175c ML |
71 | int mask; /* process status word */ |
72 | Word reg[NREG]; /* process' registers */ | |
9a3bab7a ML |
73 | Word oreg[NREG]; /* registers when process last stopped */ |
74 | short status; /* either STOPPED or FINISHED */ | |
75 | short signo; /* signal that stopped process */ | |
0022c355 | 76 | short sigcode; /* extra signal information */ |
9a3bab7a ML |
77 | int exitval; /* return value from exit() */ |
78 | long sigset; /* bit array of traced signals */ | |
79 | CacheWord word[CSIZE]; /* text segment cache */ | |
5870175c | 80 | Ttyinfo ttyinfo; /* process' terminal characteristics */ |
2fd0f574 | 81 | Address sigstatus; /* process' handler for current signal */ |
9a3bab7a ML |
82 | }; |
83 | ||
84 | /* | |
85 | * These definitions are for the arguments to "pio". | |
86 | */ | |
87 | ||
88 | typedef enum { PREAD, PWRITE } PioOp; | |
89 | typedef enum { TEXTSEG, DATASEG } PioSeg; | |
90 | ||
91 | private struct Process pbuf; | |
92 | ||
0022c355 | 93 | #define MAXNCMDARGS 1000 /* maximum number of arguments to RUN */ |
9a3bab7a | 94 | |
ca69b757 ML |
95 | extern int errno; |
96 | ||
9a3bab7a ML |
97 | private Boolean just_started; |
98 | private int argc; | |
99 | private String argv[MAXNCMDARGS]; | |
100 | private String infile, outfile; | |
101 | ||
102 | /* | |
103 | * Initialize process information. | |
104 | */ | |
105 | ||
106 | public process_init() | |
107 | { | |
108 | register Integer i; | |
109 | Char buf[10]; | |
110 | ||
111 | process = &pbuf; | |
112 | process->status = (coredump) ? STOPPED : NOTSTARTED; | |
113 | setsigtrace(); | |
114 | for (i = 0; i < NREG; i++) { | |
115 | sprintf(buf, "$r%d", i); | |
116 | defregname(identname(buf, false), i); | |
117 | } | |
ca6575f0 | 118 | #ifdef vax |
9a3bab7a | 119 | defregname(identname("$ap", true), ARGP); |
ca6575f0 | 120 | #endif |
9a3bab7a ML |
121 | defregname(identname("$fp", true), FRP); |
122 | defregname(identname("$sp", true), STKP); | |
123 | defregname(identname("$pc", true), PROGCTR); | |
124 | if (coredump) { | |
125 | coredump_readin(process->mask, process->reg, process->signo); | |
4e067a2c ML |
126 | pc = process->reg[PROGCTR]; |
127 | getsrcpos(); | |
9a3bab7a | 128 | } |
4e067a2c | 129 | arginit(); |
9a3bab7a ML |
130 | } |
131 | ||
132 | /* | |
133 | * Routines to get at process information from outside this module. | |
134 | */ | |
135 | ||
136 | public Word reg(n) | |
137 | Integer n; | |
138 | { | |
139 | register Word w; | |
140 | ||
141 | if (n == NREG) { | |
142 | w = process->mask; | |
143 | } else { | |
144 | w = process->reg[n]; | |
145 | } | |
146 | return w; | |
147 | } | |
148 | ||
149 | public setreg(n, w) | |
150 | Integer n; | |
151 | Word w; | |
152 | { | |
153 | process->reg[n] = w; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Begin execution. | |
158 | * | |
159 | * We set a breakpoint at the end of the code so that the | |
160 | * process data doesn't disappear after the program terminates. | |
161 | */ | |
162 | ||
163 | private Boolean remade(); | |
164 | ||
165 | public start(argv, infile, outfile) | |
166 | String argv[]; | |
167 | String infile, outfile; | |
168 | { | |
169 | String pargv[4]; | |
170 | Node cond; | |
171 | ||
172 | if (coredump) { | |
173 | coredump = false; | |
174 | fclose(corefile); | |
175 | coredump_close(); | |
176 | } | |
177 | if (argv == nil) { | |
178 | argv = pargv; | |
179 | pargv[0] = objname; | |
180 | pargv[1] = nil; | |
181 | } else { | |
182 | argv[argc] = nil; | |
183 | } | |
0022c355 | 184 | pstart(process, argv, infile, outfile); |
9a3bab7a ML |
185 | if (remade(objname)) { |
186 | reinit(argv, infile, outfile); | |
187 | } | |
9a3bab7a ML |
188 | if (process->status == STOPPED) { |
189 | pc = 0; | |
2fd0f574 | 190 | setcurfunc(program); |
9a3bab7a ML |
191 | if (objsize != 0) { |
192 | cond = build(O_EQ, build(O_SYM, pcsym), build(O_LCON, lastaddr())); | |
193 | event_once(cond, buildcmdlist(build(O_ENDX))); | |
194 | } | |
195 | } | |
196 | } | |
197 | ||
198 | /* | |
199 | * Check to see if the object file has changed since the symbolic | |
200 | * information last was read. | |
201 | */ | |
202 | ||
203 | private time_t modtime; | |
204 | ||
205 | private Boolean remade(filename) | |
206 | String filename; | |
207 | { | |
208 | struct stat s; | |
209 | Boolean b; | |
210 | ||
211 | stat(filename, &s); | |
212 | b = (Boolean) (modtime != 0 and modtime < s.st_mtime); | |
213 | modtime = s.st_mtime; | |
214 | return b; | |
215 | } | |
216 | ||
217 | /* | |
218 | * Set up what signals we want to trace. | |
219 | */ | |
220 | ||
221 | private setsigtrace() | |
222 | { | |
223 | register Integer i; | |
224 | register Process p; | |
225 | ||
226 | p = process; | |
227 | for (i = 1; i <= NSIG; i++) { | |
228 | psigtrace(p, i, true); | |
229 | } | |
230 | psigtrace(p, SIGHUP, false); | |
231 | psigtrace(p, SIGKILL, false); | |
232 | psigtrace(p, SIGALRM, false); | |
233 | psigtrace(p, SIGTSTP, false); | |
234 | psigtrace(p, SIGCONT, false); | |
235 | psigtrace(p, SIGCHLD, false); | |
ca6575f0 | 236 | psigtrace(p, SIGWINCH, false); |
9a3bab7a ML |
237 | } |
238 | ||
239 | /* | |
240 | * Initialize the argument list. | |
241 | */ | |
242 | ||
243 | public arginit() | |
244 | { | |
245 | infile = nil; | |
246 | outfile = nil; | |
247 | argv[0] = objname; | |
248 | argc = 1; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Add an argument to the list for the debuggee. | |
253 | */ | |
254 | ||
255 | public newarg(arg) | |
256 | String arg; | |
257 | { | |
258 | if (argc >= MAXNCMDARGS) { | |
259 | error("too many arguments"); | |
260 | } | |
261 | argv[argc++] = arg; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Set the standard input for the debuggee. | |
266 | */ | |
267 | ||
268 | public inarg(filename) | |
269 | String filename; | |
270 | { | |
271 | if (infile != nil) { | |
272 | error("multiple input redirects"); | |
273 | } | |
274 | infile = filename; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Set the standard output for the debuggee. | |
279 | * Probably should check to avoid overwriting an existing file. | |
280 | */ | |
281 | ||
282 | public outarg(filename) | |
283 | String filename; | |
284 | { | |
285 | if (outfile != nil) { | |
286 | error("multiple output redirect"); | |
287 | } | |
288 | outfile = filename; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Start debuggee executing. | |
293 | */ | |
294 | ||
295 | public run() | |
296 | { | |
297 | process->status = STOPPED; | |
298 | fixbps(); | |
299 | curline = 0; | |
300 | start(argv, infile, outfile); | |
301 | just_started = true; | |
302 | isstopped = false; | |
8ee6535a | 303 | cont(0); |
9a3bab7a ML |
304 | } |
305 | ||
306 | /* | |
307 | * Continue execution wherever we left off. | |
308 | * | |
309 | * Note that this routine never returns. Eventually bpact() will fail | |
310 | * and we'll call printstatus or step will call it. | |
311 | */ | |
312 | ||
313 | typedef int Intfunc(); | |
314 | ||
315 | private Intfunc *dbintr; | |
316 | private intr(); | |
317 | ||
36fd36ba | 318 | public cont(signo) |
2fd0f574 | 319 | integer signo; |
9a3bab7a | 320 | { |
2fd0f574 SL |
321 | integer s; |
322 | ||
9a3bab7a ML |
323 | dbintr = signal(SIGINT, intr); |
324 | if (just_started) { | |
325 | just_started = false; | |
326 | } else { | |
327 | if (not isstopped) { | |
328 | error("can't continue execution"); | |
329 | } | |
330 | isstopped = false; | |
36fd36ba | 331 | stepover(); |
9a3bab7a | 332 | } |
2fd0f574 | 333 | s = signo; |
9a3bab7a ML |
334 | for (;;) { |
335 | if (single_stepping) { | |
336 | printnews(); | |
337 | } else { | |
338 | setallbps(); | |
2fd0f574 | 339 | resume(s); |
9a3bab7a | 340 | unsetallbps(); |
2fd0f574 | 341 | s = DEFSIG; |
0022c355 | 342 | if (not isbperr() or not bpact()) { |
9a3bab7a ML |
343 | printstatus(); |
344 | } | |
345 | } | |
36fd36ba | 346 | stepover(); |
9a3bab7a ML |
347 | } |
348 | /* NOTREACHED */ | |
349 | } | |
350 | ||
351 | /* | |
0022c355 | 352 | * This routine is called if we get an interrupt while "running" |
9a3bab7a ML |
353 | * but actually in the debugger. Could happen, for example, while |
354 | * processing breakpoints. | |
355 | * | |
356 | * We basically just want to keep going; the assumption is | |
0022c355 | 357 | * that when the process resumes it will get the interrupt, |
9a3bab7a ML |
358 | * which will then be handled. |
359 | */ | |
360 | ||
361 | private intr() | |
362 | { | |
363 | signal(SIGINT, intr); | |
364 | } | |
365 | ||
366 | public fixintr() | |
367 | { | |
368 | signal(SIGINT, dbintr); | |
369 | } | |
370 | ||
371 | /* | |
372 | * Resume execution. | |
373 | */ | |
374 | ||
36fd36ba ML |
375 | public resume(signo) |
376 | int signo; | |
9a3bab7a ML |
377 | { |
378 | register Process p; | |
379 | ||
380 | p = process; | |
36fd36ba | 381 | pcont(p, signo); |
9a3bab7a | 382 | pc = process->reg[PROGCTR]; |
e0a80343 | 383 | if (p->status != STOPPED) { |
36fd36ba ML |
384 | if (p->signo != 0) { |
385 | error("program terminated by signal %d", p->signo); | |
8ee6535a | 386 | } else if (not runfirst) { |
0022c355 ML |
387 | if (p->exitval == 0) { |
388 | error("program exited"); | |
389 | } else { | |
390 | error("program exited with code %d", p->exitval); | |
391 | } | |
36fd36ba | 392 | } |
e0a80343 | 393 | } |
9a3bab7a ML |
394 | } |
395 | ||
396 | /* | |
397 | * Continue execution up to the next source line. | |
398 | * | |
399 | * There are two ways to define the next source line depending on what | |
400 | * is desired when a procedure or function call is encountered. Step | |
401 | * stops at the beginning of the procedure or call; next skips over it. | |
402 | */ | |
403 | ||
404 | /* | |
405 | * Stepc is what is called when the step command is given. | |
406 | * It has to play with the "isstopped" information. | |
407 | */ | |
408 | ||
409 | public stepc() | |
410 | { | |
411 | if (not isstopped) { | |
412 | error("can't continue execution"); | |
413 | } | |
414 | isstopped = false; | |
415 | dostep(false); | |
416 | isstopped = true; | |
417 | } | |
418 | ||
419 | public next() | |
420 | { | |
2fd0f574 SL |
421 | Address oldfrp, newfrp; |
422 | ||
9a3bab7a ML |
423 | if (not isstopped) { |
424 | error("can't continue execution"); | |
425 | } | |
426 | isstopped = false; | |
2fd0f574 SL |
427 | oldfrp = reg(FRP); |
428 | do { | |
429 | dostep(true); | |
430 | pc = reg(PROGCTR); | |
431 | newfrp = reg(FRP); | |
432 | } while (newfrp < oldfrp and newfrp != 0); | |
9a3bab7a ML |
433 | isstopped = true; |
434 | } | |
435 | ||
2fd0f574 SL |
436 | /* |
437 | * Continue execution until the current function returns, or, | |
438 | * if the given argument is non-nil, until execution returns to | |
439 | * somewhere within the given function. | |
440 | */ | |
441 | ||
442 | public rtnfunc (f) | |
443 | Symbol f; | |
444 | { | |
445 | Address addr; | |
446 | Symbol t; | |
447 | ||
448 | if (not isstopped) { | |
449 | error("can't continue execution"); | |
450 | } else if (f != nil and not isactive(f)) { | |
451 | error("%s is not active", symname(f)); | |
452 | } else { | |
453 | addr = return_addr(); | |
454 | if (addr == nil) { | |
455 | error("no place to return to"); | |
456 | } else { | |
457 | isstopped = false; | |
458 | contto(addr); | |
459 | if (f != nil) { | |
460 | for (;;) { | |
461 | t = whatblock(pc); | |
462 | addr = return_addr(); | |
463 | if (t == f or addr == nil) break; | |
464 | contto(addr); | |
465 | } | |
466 | } | |
0022c355 | 467 | if (not bpact()) { |
2fd0f574 SL |
468 | isstopped = true; |
469 | printstatus(); | |
470 | } | |
471 | } | |
472 | } | |
473 | } | |
474 | ||
36fd36ba ML |
475 | /* |
476 | * Single-step over the current machine instruction. | |
477 | * | |
478 | * If we're single-stepping by source line we want to step to the | |
479 | * next source line. Otherwise we're going to continue so there's | |
480 | * no reason to do all the work necessary to single-step to the next | |
481 | * source line. | |
482 | */ | |
483 | ||
2fd0f574 | 484 | public stepover() |
9a3bab7a | 485 | { |
36fd36ba ML |
486 | Boolean b; |
487 | ||
2fd0f574 SL |
488 | if (traceexec) { |
489 | printf("!! stepping over 0x%x\n", process->reg[PROGCTR]); | |
490 | } | |
36fd36ba ML |
491 | if (single_stepping) { |
492 | dostep(false); | |
493 | } else { | |
494 | b = inst_tracing; | |
495 | inst_tracing = true; | |
496 | dostep(false); | |
497 | inst_tracing = b; | |
498 | } | |
2fd0f574 SL |
499 | if (traceexec) { |
500 | printf("!! stepped over to 0x%x\n", process->reg[PROGCTR]); | |
501 | } | |
9a3bab7a ML |
502 | } |
503 | ||
504 | /* | |
0022c355 ML |
505 | * Resume execution up to the given address. We can either ignore |
506 | * breakpoints (stepto) or catch them (contto). | |
9a3bab7a ML |
507 | */ |
508 | ||
509 | public stepto(addr) | |
510 | Address addr; | |
511 | { | |
2fd0f574 SL |
512 | xto(addr, false); |
513 | } | |
514 | ||
515 | private contto (addr) | |
516 | Address addr; | |
517 | { | |
518 | xto(addr, true); | |
519 | } | |
520 | ||
521 | private xto (addr, catchbps) | |
522 | Address addr; | |
523 | boolean catchbps; | |
524 | { | |
525 | Address curpc; | |
526 | ||
527 | if (catchbps) { | |
528 | stepover(); | |
529 | } | |
530 | curpc = process->reg[PROGCTR]; | |
531 | if (addr != curpc) { | |
532 | if (traceexec) { | |
533 | printf("!! stepping from 0x%x to 0x%x\n", curpc, addr); | |
534 | } | |
535 | if (catchbps) { | |
536 | setallbps(); | |
537 | } | |
538 | setbp(addr); | |
539 | resume(DEFSIG); | |
540 | unsetbp(addr); | |
541 | if (catchbps) { | |
542 | unsetallbps(); | |
543 | } | |
544 | if (not isbperr()) { | |
545 | printstatus(); | |
546 | } | |
9a3bab7a ML |
547 | } |
548 | } | |
549 | ||
550 | /* | |
551 | * Print the status of the process. | |
552 | * This routine does not return. | |
553 | */ | |
554 | ||
555 | public printstatus() | |
556 | { | |
ca69b757 ML |
557 | int status; |
558 | ||
b0edae1c ML |
559 | if (process->status == FINISHED) { |
560 | exit(0); | |
9a3bab7a | 561 | } else { |
2fd0f574 | 562 | setcurfunc(whatblock(pc)); |
b0edae1c ML |
563 | getsrcpos(); |
564 | if (process->signo == SIGINT) { | |
565 | isstopped = true; | |
566 | printerror(); | |
567 | } else if (isbperr() and isstopped) { | |
568 | printf("stopped "); | |
86d0cc79 ML |
569 | printloc(); |
570 | putchar('\n'); | |
b0edae1c | 571 | if (curline > 0) { |
b0edae1c ML |
572 | printlines(curline, curline); |
573 | } else { | |
b0edae1c ML |
574 | printinst(pc, pc); |
575 | } | |
576 | erecover(); | |
9a3bab7a | 577 | } else { |
b0edae1c | 578 | fixintr(); |
9a3bab7a ML |
579 | isstopped = true; |
580 | printerror(); | |
581 | } | |
582 | } | |
583 | } | |
584 | ||
86d0cc79 ML |
585 | /* |
586 | * Print out the current location in the debuggee. | |
587 | */ | |
588 | ||
589 | public printloc() | |
590 | { | |
591 | printf("in "); | |
592 | printname(stdout, curfunc); | |
593 | putchar(' '); | |
8ee6535a | 594 | if (curline > 0 and not useInstLoc) { |
86d0cc79 ML |
595 | printsrcpos(); |
596 | } else { | |
8ee6535a ML |
597 | useInstLoc = false; |
598 | curline = 0; | |
86d0cc79 ML |
599 | printf("at 0x%x", pc); |
600 | } | |
601 | } | |
602 | ||
9a3bab7a ML |
603 | /* |
604 | * Some functions for testing the state of the process. | |
605 | */ | |
606 | ||
607 | public Boolean notstarted(p) | |
608 | Process p; | |
609 | { | |
610 | return (Boolean) (p->status == NOTSTARTED); | |
611 | } | |
612 | ||
613 | public Boolean isfinished(p) | |
614 | Process p; | |
615 | { | |
616 | return (Boolean) (p->status == FINISHED); | |
617 | } | |
618 | ||
619 | /* | |
0022c355 ML |
620 | * Predicate to test if the reason the process stopped was because |
621 | * of a breakpoint. If so, as a side effect clear the local copy of | |
622 | * signal handler associated with process. We must do this so as to | |
623 | * not confuse future stepping or continuing by possibly concluding | |
624 | * the process should continue with a SIGTRAP handler. | |
9a3bab7a ML |
625 | */ |
626 | ||
0022c355 ML |
627 | public boolean isbperr() |
628 | { | |
629 | Process p; | |
630 | boolean b; | |
631 | ||
632 | p = process; | |
633 | if (p->status == STOPPED and p->signo == SIGTRAP) { | |
634 | b = true; | |
635 | p->sigstatus = 0; | |
636 | } else { | |
637 | b = false; | |
638 | } | |
639 | return b; | |
640 | } | |
641 | ||
642 | /* | |
643 | * Return the signal number that stopped the process. | |
644 | */ | |
645 | ||
646 | public integer errnum (p) | |
9a3bab7a ML |
647 | Process p; |
648 | { | |
649 | return p->signo; | |
650 | } | |
651 | ||
0022c355 ML |
652 | /* |
653 | * Return the signal code associated with the signal. | |
654 | */ | |
655 | ||
656 | public integer errcode (p) | |
57a9bb29 SL |
657 | Process p; |
658 | { | |
659 | return p->sigcode; | |
660 | } | |
661 | ||
9a3bab7a ML |
662 | /* |
663 | * Return the termination code of the process. | |
664 | */ | |
665 | ||
0022c355 | 666 | public integer exitcode (p) |
9a3bab7a ML |
667 | Process p; |
668 | { | |
669 | return p->exitval; | |
670 | } | |
671 | ||
672 | /* | |
673 | * These routines are used to access the debuggee process from | |
674 | * outside this module. | |
675 | * | |
676 | * They invoke "pio" which eventually leads to a call to "ptrace". | |
8ee6535a ML |
677 | * The system generates an I/O error when a ptrace fails. During reads |
678 | * these are ignored, during writes they are reported as an error, and | |
679 | * for anything else they cause a fatal error. | |
9a3bab7a ML |
680 | */ |
681 | ||
682 | extern Intfunc *onsyserr(); | |
683 | ||
684 | private badaddr; | |
8ee6535a | 685 | private read_err(), write_err(); |
9a3bab7a ML |
686 | |
687 | /* | |
688 | * Read from the process' instruction area. | |
689 | */ | |
690 | ||
691 | public iread(buff, addr, nbytes) | |
692 | char *buff; | |
693 | Address addr; | |
694 | int nbytes; | |
695 | { | |
696 | Intfunc *f; | |
697 | ||
8ee6535a | 698 | f = onsyserr(EIO, read_err); |
9a3bab7a ML |
699 | badaddr = addr; |
700 | if (coredump) { | |
701 | coredump_readtext(buff, addr, nbytes); | |
702 | } else { | |
703 | pio(process, PREAD, TEXTSEG, buff, addr, nbytes); | |
704 | } | |
705 | onsyserr(EIO, f); | |
706 | } | |
707 | ||
708 | /* | |
709 | * Write to the process' instruction area, usually in order to set | |
710 | * or unset a breakpoint. | |
711 | */ | |
712 | ||
713 | public iwrite(buff, addr, nbytes) | |
714 | char *buff; | |
715 | Address addr; | |
716 | int nbytes; | |
717 | { | |
718 | Intfunc *f; | |
719 | ||
720 | if (coredump) { | |
721 | error("no process to write to"); | |
722 | } | |
8ee6535a | 723 | f = onsyserr(EIO, write_err); |
9a3bab7a ML |
724 | badaddr = addr; |
725 | pio(process, PWRITE, TEXTSEG, buff, addr, nbytes); | |
726 | onsyserr(EIO, f); | |
727 | } | |
728 | ||
729 | /* | |
730 | * Read for the process' data area. | |
731 | */ | |
732 | ||
733 | public dread(buff, addr, nbytes) | |
734 | char *buff; | |
735 | Address addr; | |
736 | int nbytes; | |
737 | { | |
738 | Intfunc *f; | |
739 | ||
9a3bab7a ML |
740 | badaddr = addr; |
741 | if (coredump) { | |
0022c355 | 742 | f = onsyserr(EFAULT, read_err); |
9a3bab7a | 743 | coredump_readdata(buff, addr, nbytes); |
0022c355 | 744 | onsyserr(EFAULT, f); |
9a3bab7a | 745 | } else { |
0022c355 | 746 | f = onsyserr(EIO, read_err); |
9a3bab7a | 747 | pio(process, PREAD, DATASEG, buff, addr, nbytes); |
0022c355 | 748 | onsyserr(EIO, f); |
9a3bab7a | 749 | } |
9a3bab7a ML |
750 | } |
751 | ||
752 | /* | |
753 | * Write to the process' data area. | |
754 | */ | |
755 | ||
756 | public dwrite(buff, addr, nbytes) | |
757 | char *buff; | |
758 | Address addr; | |
759 | int nbytes; | |
760 | { | |
761 | Intfunc *f; | |
762 | ||
763 | if (coredump) { | |
764 | error("no process to write to"); | |
765 | } | |
8ee6535a | 766 | f = onsyserr(EIO, write_err); |
9a3bab7a ML |
767 | badaddr = addr; |
768 | pio(process, PWRITE, DATASEG, buff, addr, nbytes); | |
769 | onsyserr(EIO, f); | |
770 | } | |
771 | ||
772 | /* | |
8ee6535a ML |
773 | * Trap for errors in reading or writing to a process. |
774 | * The current approach is to "ignore" read errors and complain | |
775 | * bitterly about write errors. | |
9a3bab7a ML |
776 | */ |
777 | ||
8ee6535a | 778 | private read_err() |
9a3bab7a | 779 | { |
ae743e15 | 780 | /* |
8ee6535a | 781 | * Ignore. |
ae743e15 | 782 | */ |
9a3bab7a ML |
783 | } |
784 | ||
8ee6535a ML |
785 | private write_err() |
786 | { | |
787 | error("can't write to process (address 0x%x)", badaddr); | |
788 | } | |
789 | ||
9a3bab7a ML |
790 | /* |
791 | * Ptrace interface. | |
792 | */ | |
793 | ||
794 | /* | |
795 | * This magic macro enables us to look at the process' registers | |
8ee6535a | 796 | * in its user structure. |
9a3bab7a ML |
797 | */ |
798 | ||
799 | #define regloc(reg) (ctob(UPAGES) + ( sizeof(int) * (reg) )) | |
800 | ||
801 | #define WMASK (~(sizeof(Word) - 1)) | |
802 | #define cachehash(addr) ((unsigned) ((addr >> 2) % CSIZE)) | |
803 | ||
804 | #define FIRSTSIG SIGINT | |
805 | #define LASTSIG SIGQUIT | |
806 | #define ischild(pid) ((pid) == 0) | |
0022c355 | 807 | #define traceme() ptrace(0, 0, 0, 0) |
9a3bab7a ML |
808 | #define setrep(n) (1 << ((n)-1)) |
809 | #define istraced(p) (p->sigset&setrep(p->signo)) | |
810 | ||
0022c355 ML |
811 | /* |
812 | * Ptrace options (specified in first argument). | |
813 | */ | |
814 | ||
815 | #define UREAD 3 /* read from process's user structure */ | |
816 | #define UWRITE 6 /* write to process's user structure */ | |
817 | #define IREAD 1 /* read from process's instruction space */ | |
818 | #define IWRITE 4 /* write to process's instruction space */ | |
819 | #define DREAD 2 /* read from process's data space */ | |
820 | #define DWRITE 5 /* write to process's data space */ | |
821 | #define CONT 7 /* continue stopped process */ | |
822 | #define SSTEP 9 /* continue for approximately one instruction */ | |
823 | #define PKILL 8 /* terminate the process */ | |
824 | ||
9a3bab7a ML |
825 | /* |
826 | * Start up a new process by forking and exec-ing the | |
827 | * given argument list, returning when the process is loaded | |
828 | * and ready to execute. The PROCESS information (pointed to | |
829 | * by the first argument) is appropriately filled. | |
830 | * | |
831 | * If the given PROCESS structure is associated with an already running | |
832 | * process, we terminate it. | |
833 | */ | |
834 | ||
835 | /* VARARGS2 */ | |
836 | private pstart(p, argv, infile, outfile) | |
837 | Process p; | |
838 | String argv[]; | |
839 | String infile; | |
840 | String outfile; | |
841 | { | |
842 | int status; | |
9a3bab7a | 843 | |
2fd0f574 SL |
844 | if (p->pid != 0) { |
845 | pterm(p); | |
0022c355 | 846 | cacheflush(p); |
9a3bab7a | 847 | } |
0022c355 | 848 | fflush(stdout); |
9a3bab7a | 849 | psigtrace(p, SIGTRAP, true); |
ca69b757 ML |
850 | p->pid = vfork(); |
851 | if (p->pid == -1) { | |
9a3bab7a ML |
852 | panic("can't fork"); |
853 | } | |
854 | if (ischild(p->pid)) { | |
0022c355 | 855 | nocatcherrs(); |
9a3bab7a ML |
856 | traceme(); |
857 | if (infile != nil) { | |
2fd0f574 | 858 | infrom(infile); |
9a3bab7a ML |
859 | } |
860 | if (outfile != nil) { | |
2fd0f574 | 861 | outto(outfile); |
9a3bab7a | 862 | } |
e0a80343 | 863 | execv(argv[0], argv); |
86d0cc79 | 864 | _exit(1); |
9a3bab7a ML |
865 | } |
866 | pwait(p->pid, &status); | |
867 | getinfo(p, status); | |
868 | if (p->status != STOPPED) { | |
0022c355 ML |
869 | beginerrmsg(); |
870 | fprintf(stderr, "warning: cannot execute %s\n", argv[0]); | |
871 | } else { | |
872 | ptraced(p->pid); | |
9a3bab7a ML |
873 | } |
874 | } | |
875 | ||
2fd0f574 SL |
876 | /* |
877 | * Terminate a ptrace'd process. | |
878 | */ | |
879 | ||
880 | public pterm (p) | |
881 | Process p; | |
882 | { | |
883 | integer status; | |
884 | ||
885 | if (p != nil and p->pid != 0) { | |
0022c355 | 886 | ptrace(PKILL, p->pid, 0, 0); |
2fd0f574 SL |
887 | pwait(p->pid, &status); |
888 | unptraced(p->pid); | |
889 | } | |
890 | } | |
891 | ||
9a3bab7a | 892 | /* |
36fd36ba ML |
893 | * Continue a stopped process. The first argument points to a Process |
894 | * structure. Before the process is restarted it's user area is modified | |
895 | * according to the values in the structure. When this routine finishes, | |
9a3bab7a ML |
896 | * the structure has the new values from the process's user area. |
897 | * | |
898 | * Pcont terminates when the process stops with a signal pending that | |
899 | * is being traced (via psigtrace), or when the process terminates. | |
900 | */ | |
901 | ||
36fd36ba | 902 | private pcont(p, signo) |
9a3bab7a | 903 | Process p; |
36fd36ba | 904 | int signo; |
9a3bab7a | 905 | { |
2fd0f574 | 906 | int s, status; |
9a3bab7a ML |
907 | |
908 | if (p->pid == 0) { | |
0022c355 | 909 | error("program is not active"); |
9a3bab7a | 910 | } |
2fd0f574 | 911 | s = signo; |
9a3bab7a | 912 | do { |
2fd0f574 SL |
913 | setinfo(p, s); |
914 | if (traceexec) { | |
915 | printf("!! pcont from 0x%x with signal %d (%d)\n", | |
916 | p->reg[PROGCTR], s, p->signo); | |
917 | fflush(stdout); | |
918 | } | |
9a3bab7a | 919 | sigs_off(); |
0022c355 | 920 | if (ptrace(CONT, p->pid, p->reg[PROGCTR], p->signo) < 0) { |
ca69b757 | 921 | panic("error %d trying to continue process", errno); |
9a3bab7a ML |
922 | } |
923 | pwait(p->pid, &status); | |
924 | sigs_on(); | |
925 | getinfo(p, status); | |
0022c355 ML |
926 | if (p->status == STOPPED and traceexec and not istraced(p)) { |
927 | printf("!! ignored signal %d at 0x%x\n", | |
928 | p->signo, p->reg[PROGCTR]); | |
2fd0f574 SL |
929 | fflush(stdout); |
930 | } | |
931 | s = p->signo; | |
9a3bab7a | 932 | } while (p->status == STOPPED and not istraced(p)); |
2fd0f574 SL |
933 | if (traceexec) { |
934 | printf("!! pcont to 0x%x on signal %d\n", p->reg[PROGCTR], p->signo); | |
935 | fflush(stdout); | |
936 | } | |
9a3bab7a ML |
937 | } |
938 | ||
939 | /* | |
940 | * Single step as best ptrace can. | |
941 | */ | |
942 | ||
2fd0f574 | 943 | public pstep(p, signo) |
9a3bab7a | 944 | Process p; |
2fd0f574 | 945 | integer signo; |
9a3bab7a | 946 | { |
0022c355 | 947 | int s, status; |
9a3bab7a | 948 | |
0022c355 ML |
949 | s = signo; |
950 | do { | |
951 | setinfo(p, s); | |
952 | if (traceexec) { | |
953 | printf("!! pstep from 0x%x with signal %d (%d)\n", | |
954 | p->reg[PROGCTR], s, p->signo); | |
955 | fflush(stdout); | |
956 | } | |
957 | sigs_off(); | |
958 | if (ptrace(SSTEP, p->pid, p->reg[PROGCTR], p->signo) < 0) { | |
959 | panic("error %d trying to step process", errno); | |
960 | } | |
961 | pwait(p->pid, &status); | |
962 | sigs_on(); | |
963 | getinfo(p, status); | |
964 | if (p->status == STOPPED and traceexec and not istraced(p)) { | |
965 | printf("!! pstep ignored signal %d at 0x%x\n", | |
966 | p->signo, p->reg[PROGCTR]); | |
967 | fflush(stdout); | |
968 | } | |
969 | s = p->signo; | |
970 | } while (p->status == STOPPED and not istraced(p)); | |
2fd0f574 | 971 | if (traceexec) { |
0022c355 ML |
972 | printf("!! pstep to 0x%x on signal %d\n", |
973 | p->reg[PROGCTR], p->signo); | |
2fd0f574 SL |
974 | fflush(stdout); |
975 | } | |
976 | if (p->status != STOPPED) { | |
0022c355 ML |
977 | if (p->exitval == 0) { |
978 | error("program exited\n"); | |
979 | } else { | |
980 | error("program exited with code %d\n", p->exitval); | |
981 | } | |
2fd0f574 | 982 | } |
9a3bab7a ML |
983 | } |
984 | ||
985 | /* | |
986 | * Return from execution when the given signal is pending. | |
987 | */ | |
988 | ||
989 | public psigtrace(p, sig, sw) | |
990 | Process p; | |
991 | int sig; | |
992 | Boolean sw; | |
993 | { | |
994 | if (sw) { | |
995 | p->sigset |= setrep(sig); | |
996 | } else { | |
997 | p->sigset &= ~setrep(sig); | |
998 | } | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Don't catch any signals. | |
1003 | * Particularly useful when letting a process finish uninhibited. | |
1004 | */ | |
1005 | ||
1006 | public unsetsigtraces(p) | |
1007 | Process p; | |
1008 | { | |
1009 | p->sigset = 0; | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * Turn off attention to signals not being caught. | |
1014 | */ | |
1015 | ||
1016 | private Intfunc *sigfunc[NSIG]; | |
1017 | ||
1018 | private sigs_off() | |
1019 | { | |
1020 | register int i; | |
1021 | ||
1022 | for (i = FIRSTSIG; i < LASTSIG; i++) { | |
1023 | if (i != SIGKILL) { | |
1024 | sigfunc[i] = signal(i, SIG_IGN); | |
1025 | } | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Turn back on attention to signals. | |
1031 | */ | |
1032 | ||
1033 | private sigs_on() | |
1034 | { | |
1035 | register int i; | |
1036 | ||
1037 | for (i = FIRSTSIG; i < LASTSIG; i++) { | |
1038 | if (i != SIGKILL) { | |
1039 | signal(i, sigfunc[i]); | |
1040 | } | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | /* | |
1045 | * Get process information from user area. | |
1046 | */ | |
1047 | ||
9a3bab7a ML |
1048 | private getinfo(p, status) |
1049 | register Process p; | |
1050 | register int status; | |
1051 | { | |
1052 | register int i; | |
2fd0f574 | 1053 | Address addr; |
9a3bab7a ML |
1054 | |
1055 | p->signo = (status&0177); | |
1056 | p->exitval = ((status >> 8)&0377); | |
1057 | if (p->signo != STOPPED) { | |
1058 | p->status = FINISHED; | |
8ee6535a | 1059 | p->pid = 0; |
2fd0f574 | 1060 | p->reg[PROGCTR] = 0; |
9a3bab7a ML |
1061 | } else { |
1062 | p->status = p->signo; | |
1063 | p->signo = p->exitval; | |
0022c355 | 1064 | p->sigcode = ptrace(UREAD, p->pid, &((struct user *) 0)->u_code, 0); |
9a3bab7a | 1065 | p->exitval = 0; |
0022c355 | 1066 | p->mask = ptrace(UREAD, p->pid, regloc(PS), 0); |
9a3bab7a | 1067 | for (i = 0; i < NREG; i++) { |
0022c355 | 1068 | p->reg[i] = ptrace(UREAD, p->pid, regloc(rloc[i]), 0); |
9a3bab7a ML |
1069 | p->oreg[i] = p->reg[i]; |
1070 | } | |
5870175c | 1071 | savetty(stdout, &(p->ttyinfo)); |
2fd0f574 | 1072 | addr = (Address) &(((struct user *) 0)->u_signal[p->signo]); |
0022c355 | 1073 | p->sigstatus = (Address) ptrace(UREAD, p->pid, addr, 0); |
9a3bab7a ML |
1074 | } |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Set process's user area information from given process structure. | |
1079 | */ | |
1080 | ||
36fd36ba | 1081 | private setinfo(p, signo) |
9a3bab7a | 1082 | register Process p; |
36fd36ba | 1083 | int signo; |
9a3bab7a ML |
1084 | { |
1085 | register int i; | |
1086 | register int r; | |
1087 | ||
8ee6535a | 1088 | if (signo == DEFSIG) { |
2fd0f574 | 1089 | if (istraced(p) and (p->sigstatus == 0 or p->sigstatus == 1)) { |
8ee6535a ML |
1090 | p->signo = 0; |
1091 | } | |
1092 | } else { | |
36fd36ba | 1093 | p->signo = signo; |
9a3bab7a ML |
1094 | } |
1095 | for (i = 0; i < NREG; i++) { | |
1096 | if ((r = p->reg[i]) != p->oreg[i]) { | |
0022c355 | 1097 | ptrace(UWRITE, p->pid, regloc(rloc[i]), r); |
9a3bab7a ML |
1098 | } |
1099 | } | |
5870175c | 1100 | restoretty(stdout, &(p->ttyinfo)); |
9a3bab7a ML |
1101 | } |
1102 | ||
2fd0f574 SL |
1103 | /* |
1104 | * Return the address associated with the current signal. | |
1105 | * (Plus two since the address points to the beginning of a procedure). | |
1106 | */ | |
1107 | ||
1108 | public Address usignal (p) | |
1109 | Process p; | |
1110 | { | |
1111 | Address r; | |
1112 | ||
1113 | r = p->sigstatus; | |
1114 | if (r != 0 and r != 1) { | |
1115 | r += 2; | |
1116 | } | |
1117 | return r; | |
1118 | } | |
1119 | ||
9a3bab7a ML |
1120 | /* |
1121 | * Structure for reading and writing by words, but dealing with bytes. | |
1122 | */ | |
1123 | ||
1124 | typedef union { | |
1125 | Word pword; | |
1126 | Byte pbyte[sizeof(Word)]; | |
1127 | } Pword; | |
1128 | ||
1129 | /* | |
1130 | * Read (write) from (to) the process' address space. | |
1131 | * We must deal with ptrace's inability to look anywhere other | |
1132 | * than at a word boundary. | |
1133 | */ | |
1134 | ||
1135 | private Word fetch(); | |
1136 | private store(); | |
1137 | ||
1138 | private pio(p, op, seg, buff, addr, nbytes) | |
1139 | Process p; | |
1140 | PioOp op; | |
1141 | PioSeg seg; | |
1142 | char *buff; | |
1143 | Address addr; | |
1144 | int nbytes; | |
1145 | { | |
1146 | register int i; | |
1147 | register Address newaddr; | |
1148 | register char *cp; | |
1149 | char *bufend; | |
1150 | Pword w; | |
1151 | Address wordaddr; | |
1152 | int byteoff; | |
1153 | ||
1154 | if (p->status != STOPPED) { | |
1155 | error("program is not active"); | |
1156 | } | |
1157 | cp = buff; | |
1158 | newaddr = addr; | |
1159 | wordaddr = (newaddr&WMASK); | |
1160 | if (wordaddr != newaddr) { | |
1161 | w.pword = fetch(p, seg, wordaddr); | |
1162 | for (i = newaddr - wordaddr; i < sizeof(Word) and nbytes > 0; i++) { | |
1163 | if (op == PREAD) { | |
1164 | *cp++ = w.pbyte[i]; | |
1165 | } else { | |
1166 | w.pbyte[i] = *cp++; | |
1167 | } | |
1168 | nbytes--; | |
1169 | } | |
1170 | if (op == PWRITE) { | |
1171 | store(p, seg, wordaddr, w.pword); | |
1172 | } | |
1173 | newaddr = wordaddr + sizeof(Word); | |
1174 | } | |
1175 | byteoff = (nbytes&(~WMASK)); | |
1176 | nbytes -= byteoff; | |
1177 | bufend = cp + nbytes; | |
ca6575f0 SL |
1178 | #ifdef tahoe |
1179 | if (((int)cp)&WMASK) { | |
1180 | /* | |
1181 | * Must copy a byte at a time, buffer not word addressable. | |
1182 | */ | |
1183 | while (cp < bufend) { | |
1184 | if (op == PREAD) { | |
1185 | w.pword = fetch(p, seg, newaddr); | |
1186 | for (i = 0; i < sizeof(Word); i++) | |
1187 | *cp++ = w.pbyte[i]; | |
1188 | } else { | |
1189 | for (i = 0; i < sizeof(Word); i++) | |
1190 | w.pbyte[i] = *cp++; | |
1191 | store(p, seg, newaddr, w.pword); | |
1192 | } | |
1193 | newaddr += sizeof(Word); | |
1194 | } | |
1195 | } else { | |
1196 | /* | |
1197 | * Buffer, word aligned, act normally... | |
1198 | */ | |
1199 | #endif | |
9a3bab7a ML |
1200 | while (cp < bufend) { |
1201 | if (op == PREAD) { | |
1202 | *((Word *) cp) = fetch(p, seg, newaddr); | |
1203 | } else { | |
1204 | store(p, seg, newaddr, *((Word *) cp)); | |
1205 | } | |
1206 | cp += sizeof(Word); | |
1207 | newaddr += sizeof(Word); | |
1208 | } | |
ca6575f0 SL |
1209 | #ifdef tahoe |
1210 | } | |
1211 | #endif | |
9a3bab7a ML |
1212 | if (byteoff > 0) { |
1213 | w.pword = fetch(p, seg, newaddr); | |
1214 | for (i = 0; i < byteoff; i++) { | |
1215 | if (op == PREAD) { | |
1216 | *cp++ = w.pbyte[i]; | |
1217 | } else { | |
1218 | w.pbyte[i] = *cp++; | |
1219 | } | |
1220 | } | |
1221 | if (op == PWRITE) { | |
1222 | store(p, seg, newaddr, w.pword); | |
1223 | } | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | /* | |
1228 | * Get a word from a process at the given address. | |
1229 | * The address is assumed to be on a word boundary. | |
1230 | * | |
1231 | * A simple cache scheme is used to avoid redundant ptrace calls | |
1232 | * to the instruction space since it is assumed to be pure. | |
1233 | * | |
1234 | * It is necessary to use a write-through scheme so that | |
1235 | * breakpoints right next to each other don't interfere. | |
1236 | */ | |
1237 | ||
1238 | private Integer nfetchs, nreads, nwrites; | |
1239 | ||
1240 | private Word fetch(p, seg, addr) | |
1241 | Process p; | |
1242 | PioSeg seg; | |
1243 | register int addr; | |
1244 | { | |
1245 | register CacheWord *wp; | |
1246 | register Word w; | |
1247 | ||
1248 | switch (seg) { | |
1249 | case TEXTSEG: | |
1250 | ++nfetchs; | |
1251 | wp = &p->word[cachehash(addr)]; | |
1252 | if (addr == 0 or wp->addr != addr) { | |
1253 | ++nreads; | |
0022c355 | 1254 | w = ptrace(IREAD, p->pid, addr, 0); |
9a3bab7a ML |
1255 | wp->addr = addr; |
1256 | wp->val = w; | |
1257 | } else { | |
1258 | w = wp->val; | |
1259 | } | |
1260 | break; | |
1261 | ||
1262 | case DATASEG: | |
0022c355 | 1263 | w = ptrace(DREAD, p->pid, addr, 0); |
9a3bab7a ML |
1264 | break; |
1265 | ||
1266 | default: | |
1267 | panic("fetch: bad seg %d", seg); | |
1268 | /* NOTREACHED */ | |
1269 | } | |
1270 | return w; | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Put a word into the process' address space at the given address. | |
1275 | * The address is assumed to be on a word boundary. | |
1276 | */ | |
1277 | ||
1278 | private store(p, seg, addr, data) | |
1279 | Process p; | |
1280 | PioSeg seg; | |
1281 | int addr; | |
1282 | Word data; | |
1283 | { | |
1284 | register CacheWord *wp; | |
1285 | ||
1286 | switch (seg) { | |
1287 | case TEXTSEG: | |
1288 | ++nwrites; | |
1289 | wp = &p->word[cachehash(addr)]; | |
1290 | wp->addr = addr; | |
1291 | wp->val = data; | |
0022c355 | 1292 | ptrace(IWRITE, p->pid, addr, data); |
9a3bab7a ML |
1293 | break; |
1294 | ||
1295 | case DATASEG: | |
0022c355 | 1296 | ptrace(DWRITE, p->pid, addr, data); |
9a3bab7a ML |
1297 | break; |
1298 | ||
1299 | default: | |
1300 | panic("store: bad seg %d", seg); | |
1301 | /* NOTREACHED */ | |
1302 | } | |
1303 | } | |
1304 | ||
0022c355 ML |
1305 | /* |
1306 | * Flush the instruction cache associated with a process. | |
1307 | */ | |
1308 | ||
1309 | private cacheflush (p) | |
1310 | Process p; | |
1311 | { | |
1312 | bzero(p->word, sizeof(p->word)); | |
1313 | } | |
1314 | ||
9a3bab7a ML |
1315 | public printptraceinfo() |
1316 | { | |
1317 | printf("%d fetchs, %d reads, %d writes\n", nfetchs, nreads, nwrites); | |
1318 | } | |
1319 | ||
1320 | /* | |
2fd0f574 SL |
1321 | * Redirect input. |
1322 | * Assuming this is called from a child, we should be careful to avoid | |
1323 | * (possibly) shared standard I/O buffers. | |
1324 | */ | |
1325 | ||
1326 | private infrom (filename) | |
1327 | String filename; | |
1328 | { | |
1329 | Fileid in; | |
1330 | ||
1331 | in = open(filename, 0); | |
1332 | if (in == -1) { | |
1333 | write(2, "can't read ", 11); | |
1334 | write(2, filename, strlen(filename)); | |
1335 | write(2, "\n", 1); | |
1336 | _exit(1); | |
1337 | } | |
1338 | fswap(0, in); | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * Redirect standard output. | |
1343 | * Same assumptions as for "infrom" above. | |
1344 | */ | |
1345 | ||
1346 | private outto (filename) | |
1347 | String filename; | |
1348 | { | |
1349 | Fileid out; | |
1350 | ||
1351 | out = creat(filename, 0666); | |
1352 | if (out == -1) { | |
1353 | write(2, "can't write ", 12); | |
1354 | write(2, filename, strlen(filename)); | |
1355 | write(2, "\n", 1); | |
1356 | _exit(1); | |
1357 | } | |
1358 | fswap(1, out); | |
1359 | } | |
1360 | ||
1361 | /* | |
1362 | * Swap file numbers, useful for redirecting standard input or output. | |
9a3bab7a ML |
1363 | */ |
1364 | ||
1365 | private fswap(oldfd, newfd) | |
2fd0f574 SL |
1366 | Fileid oldfd; |
1367 | Fileid newfd; | |
9a3bab7a ML |
1368 | { |
1369 | if (oldfd != newfd) { | |
1370 | close(oldfd); | |
1371 | dup(newfd); | |
1372 | close(newfd); | |
1373 | } | |
1374 | } | |
f7adfe8e | 1375 | |
f7adfe8e | 1376 | /* |
0022c355 | 1377 | * Signal name manipulation. |
f7adfe8e | 1378 | */ |
0022c355 ML |
1379 | |
1380 | private String signames[NSIG] = { | |
1381 | 0, | |
1382 | "HUP", "INT", "QUIT", "ILL", "TRAP", | |
1383 | "IOT", "EMT", "FPE", "KILL", "BUS", | |
1384 | "SEGV", "SYS", "PIPE", "ALRM", "TERM", | |
1385 | 0, "STOP", "TSTP", "CONT", "CHLD", | |
1386 | "TTIN", "TTOU", "TINT", "XCPU", "XFSZ", | |
ca6575f0 | 1387 | "VTALRM", "PROF", "WINCH", "USR1", "USR2" |
f7adfe8e SL |
1388 | }; |
1389 | ||
1390 | /* | |
0022c355 ML |
1391 | * Get the signal number associated with a given name. |
1392 | * The name is first translated to upper case if necessary. | |
f7adfe8e | 1393 | */ |
0022c355 ML |
1394 | |
1395 | public integer siglookup (s) | |
f7adfe8e SL |
1396 | String s; |
1397 | { | |
0022c355 ML |
1398 | register char *p, *q; |
1399 | char buf[100]; | |
1400 | integer i; | |
1401 | ||
1402 | p = s; | |
1403 | q = buf; | |
1404 | while (*p != '\0') { | |
1405 | if (*p >= 'a' and *p <= 'z') { | |
1406 | *q = (*p - 'a') + 'A'; | |
1407 | } else { | |
1408 | *q = *p; | |
1409 | } | |
1410 | ++p; | |
1411 | ++q; | |
1412 | } | |
1413 | *q = '\0'; | |
1414 | p = buf; | |
1415 | if (buf[0] == 'S' and buf[1] == 'I' and buf[2] == 'G') { | |
1416 | p += 3; | |
1417 | } | |
1418 | i = 1; | |
1419 | for (;;) { | |
1420 | if (i >= sizeof(signames) div sizeof(signames[0])) { | |
1421 | error("signal \"%s\" unknown", s); | |
1422 | i = 0; | |
1423 | break; | |
1424 | } | |
1425 | if (signames[i] != nil and streq(signames[i], p)) { | |
1426 | break; | |
1427 | } | |
1428 | ++i; | |
1429 | } | |
1430 | return i; | |
f7adfe8e SL |
1431 | } |
1432 | ||
1433 | /* | |
0022c355 ML |
1434 | * Print all signals being ignored by the debugger. |
1435 | * These signals are auotmatically | |
f7adfe8e SL |
1436 | * passed on to the debugged process. |
1437 | */ | |
0022c355 ML |
1438 | |
1439 | public printsigsignored (p) | |
57a9bb29 | 1440 | Process p; |
f7adfe8e | 1441 | { |
57a9bb29 | 1442 | printsigs(~p->sigset); |
f7adfe8e SL |
1443 | } |
1444 | ||
1445 | /* | |
1446 | * Print all signals being intercepted by | |
1447 | * the debugger for the specified process. | |
1448 | */ | |
0022c355 | 1449 | |
57a9bb29 SL |
1450 | public printsigscaught(p) |
1451 | Process p; | |
f7adfe8e | 1452 | { |
57a9bb29 | 1453 | printsigs(p->sigset); |
f7adfe8e SL |
1454 | } |
1455 | ||
0022c355 ML |
1456 | private printsigs (set) |
1457 | integer set; | |
57a9bb29 | 1458 | { |
0022c355 ML |
1459 | integer s; |
1460 | char separator[2]; | |
1461 | ||
1462 | separator[0] = '\0'; | |
1463 | for (s = 1; s < sizeof(signames) div sizeof(signames[0]); s++) { | |
1464 | if (set & setrep(s)) { | |
1465 | if (signames[s] != nil) { | |
1466 | printf("%s%s", separator, signames[s]); | |
1467 | separator[0] = ' '; | |
1468 | separator[1] = '\0'; | |
1469 | } | |
57a9bb29 | 1470 | } |
0022c355 ML |
1471 | } |
1472 | if (separator[0] == ' ') { | |
57a9bb29 | 1473 | putchar('\n'); |
57a9bb29 SL |
1474 | } |
1475 | } |