Commit | Line | Data |
---|---|---|
9a3bab7a ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
0022c355 ML |
3 | static char sccsid[] = "@(#)process.c 1.17 (Berkeley) %G%"; |
4 | ||
5 | static char rcsid[] = "$Header: process.c,v 1.5 84/12/26 10:41:37 linton Exp $"; | |
9a3bab7a ML |
6 | |
7 | /* | |
8 | * Process management. | |
9 | * | |
10 | * This module contains the routines to manage the execution and | |
11 | * tracing of the debuggee process. | |
12 | */ | |
13 | ||
14 | #include "defs.h" | |
15 | #include "process.h" | |
16 | #include "machine.h" | |
17 | #include "events.h" | |
18 | #include "tree.h" | |
8ee6535a | 19 | #include "eval.h" |
9a3bab7a ML |
20 | #include "operators.h" |
21 | #include "source.h" | |
22 | #include "object.h" | |
23 | #include "mappings.h" | |
24 | #include "main.h" | |
25 | #include "coredump.h" | |
26 | #include <signal.h> | |
27 | #include <errno.h> | |
28 | #include <sys/param.h> | |
2fd0f574 SL |
29 | #include <sys/dir.h> |
30 | #include <sys/user.h> | |
b0edae1c | 31 | #include <machine/reg.h> |
9a3bab7a ML |
32 | #include <sys/stat.h> |
33 | ||
34 | #ifndef public | |
35 | ||
36 | typedef struct Process *Process; | |
37 | ||
38 | Process process; | |
39 | ||
8ee6535a ML |
40 | #define DEFSIG -1 |
41 | ||
9a3bab7a ML |
42 | #include "machine.h" |
43 | ||
44 | #endif | |
45 | ||
46 | #define NOTSTARTED 1 | |
47 | #define STOPPED 0177 | |
48 | #define FINISHED 0 | |
49 | ||
50 | /* | |
2fd0f574 SL |
51 | * A cache of the instruction segment is kept to reduce the number |
52 | * of system calls. Might be better just to read the entire | |
53 | * code space into memory. | |
9a3bab7a ML |
54 | */ |
55 | ||
56 | #define CSIZE 1003 /* size of instruction cache */ | |
57 | ||
58 | typedef struct { | |
59 | Word addr; | |
60 | Word val; | |
61 | } CacheWord; | |
62 | ||
63 | /* | |
64 | * This structure holds the information we need from the user structure. | |
65 | */ | |
66 | ||
67 | struct Process { | |
68 | int pid; /* process being traced */ | |
5870175c ML |
69 | int mask; /* process status word */ |
70 | Word reg[NREG]; /* process' registers */ | |
9a3bab7a ML |
71 | Word oreg[NREG]; /* registers when process last stopped */ |
72 | short status; /* either STOPPED or FINISHED */ | |
73 | short signo; /* signal that stopped process */ | |
0022c355 | 74 | short sigcode; /* extra signal information */ |
9a3bab7a ML |
75 | int exitval; /* return value from exit() */ |
76 | long sigset; /* bit array of traced signals */ | |
77 | CacheWord word[CSIZE]; /* text segment cache */ | |
5870175c | 78 | Ttyinfo ttyinfo; /* process' terminal characteristics */ |
2fd0f574 | 79 | Address sigstatus; /* process' handler for current signal */ |
9a3bab7a ML |
80 | }; |
81 | ||
82 | /* | |
83 | * These definitions are for the arguments to "pio". | |
84 | */ | |
85 | ||
86 | typedef enum { PREAD, PWRITE } PioOp; | |
87 | typedef enum { TEXTSEG, DATASEG } PioSeg; | |
88 | ||
89 | private struct Process pbuf; | |
90 | ||
0022c355 | 91 | #define MAXNCMDARGS 1000 /* maximum number of arguments to RUN */ |
9a3bab7a | 92 | |
ca69b757 ML |
93 | extern int errno; |
94 | ||
9a3bab7a ML |
95 | private Boolean just_started; |
96 | private int argc; | |
97 | private String argv[MAXNCMDARGS]; | |
98 | private String infile, outfile; | |
99 | ||
100 | /* | |
101 | * Initialize process information. | |
102 | */ | |
103 | ||
104 | public process_init() | |
105 | { | |
106 | register Integer i; | |
107 | Char buf[10]; | |
108 | ||
109 | process = &pbuf; | |
110 | process->status = (coredump) ? STOPPED : NOTSTARTED; | |
111 | setsigtrace(); | |
112 | for (i = 0; i < NREG; i++) { | |
113 | sprintf(buf, "$r%d", i); | |
114 | defregname(identname(buf, false), i); | |
115 | } | |
116 | defregname(identname("$ap", true), ARGP); | |
117 | defregname(identname("$fp", true), FRP); | |
118 | defregname(identname("$sp", true), STKP); | |
119 | defregname(identname("$pc", true), PROGCTR); | |
120 | if (coredump) { | |
121 | coredump_readin(process->mask, process->reg, process->signo); | |
4e067a2c ML |
122 | pc = process->reg[PROGCTR]; |
123 | getsrcpos(); | |
9a3bab7a | 124 | } |
4e067a2c | 125 | arginit(); |
9a3bab7a ML |
126 | } |
127 | ||
128 | /* | |
129 | * Routines to get at process information from outside this module. | |
130 | */ | |
131 | ||
132 | public Word reg(n) | |
133 | Integer n; | |
134 | { | |
135 | register Word w; | |
136 | ||
137 | if (n == NREG) { | |
138 | w = process->mask; | |
139 | } else { | |
140 | w = process->reg[n]; | |
141 | } | |
142 | return w; | |
143 | } | |
144 | ||
145 | public setreg(n, w) | |
146 | Integer n; | |
147 | Word w; | |
148 | { | |
149 | process->reg[n] = w; | |
150 | } | |
151 | ||
152 | /* | |
153 | * Begin execution. | |
154 | * | |
155 | * We set a breakpoint at the end of the code so that the | |
156 | * process data doesn't disappear after the program terminates. | |
157 | */ | |
158 | ||
159 | private Boolean remade(); | |
160 | ||
161 | public start(argv, infile, outfile) | |
162 | String argv[]; | |
163 | String infile, outfile; | |
164 | { | |
165 | String pargv[4]; | |
166 | Node cond; | |
167 | ||
168 | if (coredump) { | |
169 | coredump = false; | |
170 | fclose(corefile); | |
171 | coredump_close(); | |
172 | } | |
173 | if (argv == nil) { | |
174 | argv = pargv; | |
175 | pargv[0] = objname; | |
176 | pargv[1] = nil; | |
177 | } else { | |
178 | argv[argc] = nil; | |
179 | } | |
0022c355 | 180 | pstart(process, argv, infile, outfile); |
9a3bab7a ML |
181 | if (remade(objname)) { |
182 | reinit(argv, infile, outfile); | |
183 | } | |
9a3bab7a ML |
184 | if (process->status == STOPPED) { |
185 | pc = 0; | |
2fd0f574 | 186 | setcurfunc(program); |
9a3bab7a ML |
187 | if (objsize != 0) { |
188 | cond = build(O_EQ, build(O_SYM, pcsym), build(O_LCON, lastaddr())); | |
189 | event_once(cond, buildcmdlist(build(O_ENDX))); | |
190 | } | |
191 | } | |
192 | } | |
193 | ||
194 | /* | |
195 | * Check to see if the object file has changed since the symbolic | |
196 | * information last was read. | |
197 | */ | |
198 | ||
199 | private time_t modtime; | |
200 | ||
201 | private Boolean remade(filename) | |
202 | String filename; | |
203 | { | |
204 | struct stat s; | |
205 | Boolean b; | |
206 | ||
207 | stat(filename, &s); | |
208 | b = (Boolean) (modtime != 0 and modtime < s.st_mtime); | |
209 | modtime = s.st_mtime; | |
210 | return b; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Set up what signals we want to trace. | |
215 | */ | |
216 | ||
217 | private setsigtrace() | |
218 | { | |
219 | register Integer i; | |
220 | register Process p; | |
221 | ||
222 | p = process; | |
223 | for (i = 1; i <= NSIG; i++) { | |
224 | psigtrace(p, i, true); | |
225 | } | |
226 | psigtrace(p, SIGHUP, false); | |
227 | psigtrace(p, SIGKILL, false); | |
228 | psigtrace(p, SIGALRM, false); | |
229 | psigtrace(p, SIGTSTP, false); | |
230 | psigtrace(p, SIGCONT, false); | |
231 | psigtrace(p, SIGCHLD, false); | |
232 | } | |
233 | ||
234 | /* | |
235 | * Initialize the argument list. | |
236 | */ | |
237 | ||
238 | public arginit() | |
239 | { | |
240 | infile = nil; | |
241 | outfile = nil; | |
242 | argv[0] = objname; | |
243 | argc = 1; | |
244 | } | |
245 | ||
246 | /* | |
247 | * Add an argument to the list for the debuggee. | |
248 | */ | |
249 | ||
250 | public newarg(arg) | |
251 | String arg; | |
252 | { | |
253 | if (argc >= MAXNCMDARGS) { | |
254 | error("too many arguments"); | |
255 | } | |
256 | argv[argc++] = arg; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Set the standard input for the debuggee. | |
261 | */ | |
262 | ||
263 | public inarg(filename) | |
264 | String filename; | |
265 | { | |
266 | if (infile != nil) { | |
267 | error("multiple input redirects"); | |
268 | } | |
269 | infile = filename; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Set the standard output for the debuggee. | |
274 | * Probably should check to avoid overwriting an existing file. | |
275 | */ | |
276 | ||
277 | public outarg(filename) | |
278 | String filename; | |
279 | { | |
280 | if (outfile != nil) { | |
281 | error("multiple output redirect"); | |
282 | } | |
283 | outfile = filename; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Start debuggee executing. | |
288 | */ | |
289 | ||
290 | public run() | |
291 | { | |
292 | process->status = STOPPED; | |
293 | fixbps(); | |
294 | curline = 0; | |
295 | start(argv, infile, outfile); | |
296 | just_started = true; | |
297 | isstopped = false; | |
8ee6535a | 298 | cont(0); |
9a3bab7a ML |
299 | } |
300 | ||
301 | /* | |
302 | * Continue execution wherever we left off. | |
303 | * | |
304 | * Note that this routine never returns. Eventually bpact() will fail | |
305 | * and we'll call printstatus or step will call it. | |
306 | */ | |
307 | ||
308 | typedef int Intfunc(); | |
309 | ||
310 | private Intfunc *dbintr; | |
311 | private intr(); | |
312 | ||
36fd36ba | 313 | public cont(signo) |
2fd0f574 | 314 | integer signo; |
9a3bab7a | 315 | { |
2fd0f574 SL |
316 | integer s; |
317 | ||
9a3bab7a ML |
318 | dbintr = signal(SIGINT, intr); |
319 | if (just_started) { | |
320 | just_started = false; | |
321 | } else { | |
322 | if (not isstopped) { | |
323 | error("can't continue execution"); | |
324 | } | |
325 | isstopped = false; | |
36fd36ba | 326 | stepover(); |
9a3bab7a | 327 | } |
2fd0f574 | 328 | s = signo; |
9a3bab7a ML |
329 | for (;;) { |
330 | if (single_stepping) { | |
331 | printnews(); | |
332 | } else { | |
333 | setallbps(); | |
2fd0f574 | 334 | resume(s); |
9a3bab7a | 335 | unsetallbps(); |
2fd0f574 | 336 | s = DEFSIG; |
0022c355 | 337 | if (not isbperr() or not bpact()) { |
9a3bab7a ML |
338 | printstatus(); |
339 | } | |
340 | } | |
36fd36ba | 341 | stepover(); |
9a3bab7a ML |
342 | } |
343 | /* NOTREACHED */ | |
344 | } | |
345 | ||
346 | /* | |
0022c355 | 347 | * This routine is called if we get an interrupt while "running" |
9a3bab7a ML |
348 | * but actually in the debugger. Could happen, for example, while |
349 | * processing breakpoints. | |
350 | * | |
351 | * We basically just want to keep going; the assumption is | |
0022c355 | 352 | * that when the process resumes it will get the interrupt, |
9a3bab7a ML |
353 | * which will then be handled. |
354 | */ | |
355 | ||
356 | private intr() | |
357 | { | |
358 | signal(SIGINT, intr); | |
359 | } | |
360 | ||
361 | public fixintr() | |
362 | { | |
363 | signal(SIGINT, dbintr); | |
364 | } | |
365 | ||
366 | /* | |
367 | * Resume execution. | |
368 | */ | |
369 | ||
36fd36ba ML |
370 | public resume(signo) |
371 | int signo; | |
9a3bab7a ML |
372 | { |
373 | register Process p; | |
374 | ||
375 | p = process; | |
36fd36ba | 376 | pcont(p, signo); |
9a3bab7a | 377 | pc = process->reg[PROGCTR]; |
e0a80343 | 378 | if (p->status != STOPPED) { |
36fd36ba ML |
379 | if (p->signo != 0) { |
380 | error("program terminated by signal %d", p->signo); | |
8ee6535a | 381 | } else if (not runfirst) { |
0022c355 ML |
382 | if (p->exitval == 0) { |
383 | error("program exited"); | |
384 | } else { | |
385 | error("program exited with code %d", p->exitval); | |
386 | } | |
36fd36ba | 387 | } |
e0a80343 | 388 | } |
9a3bab7a ML |
389 | } |
390 | ||
391 | /* | |
392 | * Continue execution up to the next source line. | |
393 | * | |
394 | * There are two ways to define the next source line depending on what | |
395 | * is desired when a procedure or function call is encountered. Step | |
396 | * stops at the beginning of the procedure or call; next skips over it. | |
397 | */ | |
398 | ||
399 | /* | |
400 | * Stepc is what is called when the step command is given. | |
401 | * It has to play with the "isstopped" information. | |
402 | */ | |
403 | ||
404 | public stepc() | |
405 | { | |
406 | if (not isstopped) { | |
407 | error("can't continue execution"); | |
408 | } | |
409 | isstopped = false; | |
410 | dostep(false); | |
411 | isstopped = true; | |
412 | } | |
413 | ||
414 | public next() | |
415 | { | |
2fd0f574 SL |
416 | Address oldfrp, newfrp; |
417 | ||
9a3bab7a ML |
418 | if (not isstopped) { |
419 | error("can't continue execution"); | |
420 | } | |
421 | isstopped = false; | |
2fd0f574 SL |
422 | oldfrp = reg(FRP); |
423 | do { | |
424 | dostep(true); | |
425 | pc = reg(PROGCTR); | |
426 | newfrp = reg(FRP); | |
427 | } while (newfrp < oldfrp and newfrp != 0); | |
9a3bab7a ML |
428 | isstopped = true; |
429 | } | |
430 | ||
2fd0f574 SL |
431 | /* |
432 | * Continue execution until the current function returns, or, | |
433 | * if the given argument is non-nil, until execution returns to | |
434 | * somewhere within the given function. | |
435 | */ | |
436 | ||
437 | public rtnfunc (f) | |
438 | Symbol f; | |
439 | { | |
440 | Address addr; | |
441 | Symbol t; | |
442 | ||
443 | if (not isstopped) { | |
444 | error("can't continue execution"); | |
445 | } else if (f != nil and not isactive(f)) { | |
446 | error("%s is not active", symname(f)); | |
447 | } else { | |
448 | addr = return_addr(); | |
449 | if (addr == nil) { | |
450 | error("no place to return to"); | |
451 | } else { | |
452 | isstopped = false; | |
453 | contto(addr); | |
454 | if (f != nil) { | |
455 | for (;;) { | |
456 | t = whatblock(pc); | |
457 | addr = return_addr(); | |
458 | if (t == f or addr == nil) break; | |
459 | contto(addr); | |
460 | } | |
461 | } | |
0022c355 | 462 | if (not bpact()) { |
2fd0f574 SL |
463 | isstopped = true; |
464 | printstatus(); | |
465 | } | |
466 | } | |
467 | } | |
468 | } | |
469 | ||
36fd36ba ML |
470 | /* |
471 | * Single-step over the current machine instruction. | |
472 | * | |
473 | * If we're single-stepping by source line we want to step to the | |
474 | * next source line. Otherwise we're going to continue so there's | |
475 | * no reason to do all the work necessary to single-step to the next | |
476 | * source line. | |
477 | */ | |
478 | ||
2fd0f574 | 479 | public stepover() |
9a3bab7a | 480 | { |
36fd36ba ML |
481 | Boolean b; |
482 | ||
2fd0f574 SL |
483 | if (traceexec) { |
484 | printf("!! stepping over 0x%x\n", process->reg[PROGCTR]); | |
485 | } | |
36fd36ba ML |
486 | if (single_stepping) { |
487 | dostep(false); | |
488 | } else { | |
489 | b = inst_tracing; | |
490 | inst_tracing = true; | |
491 | dostep(false); | |
492 | inst_tracing = b; | |
493 | } | |
2fd0f574 SL |
494 | if (traceexec) { |
495 | printf("!! stepped over to 0x%x\n", process->reg[PROGCTR]); | |
496 | } | |
9a3bab7a ML |
497 | } |
498 | ||
499 | /* | |
0022c355 ML |
500 | * Resume execution up to the given address. We can either ignore |
501 | * breakpoints (stepto) or catch them (contto). | |
9a3bab7a ML |
502 | */ |
503 | ||
504 | public stepto(addr) | |
505 | Address addr; | |
506 | { | |
2fd0f574 SL |
507 | xto(addr, false); |
508 | } | |
509 | ||
510 | private contto (addr) | |
511 | Address addr; | |
512 | { | |
513 | xto(addr, true); | |
514 | } | |
515 | ||
516 | private xto (addr, catchbps) | |
517 | Address addr; | |
518 | boolean catchbps; | |
519 | { | |
520 | Address curpc; | |
521 | ||
522 | if (catchbps) { | |
523 | stepover(); | |
524 | } | |
525 | curpc = process->reg[PROGCTR]; | |
526 | if (addr != curpc) { | |
527 | if (traceexec) { | |
528 | printf("!! stepping from 0x%x to 0x%x\n", curpc, addr); | |
529 | } | |
530 | if (catchbps) { | |
531 | setallbps(); | |
532 | } | |
533 | setbp(addr); | |
534 | resume(DEFSIG); | |
535 | unsetbp(addr); | |
536 | if (catchbps) { | |
537 | unsetallbps(); | |
538 | } | |
539 | if (not isbperr()) { | |
540 | printstatus(); | |
541 | } | |
9a3bab7a ML |
542 | } |
543 | } | |
544 | ||
545 | /* | |
546 | * Print the status of the process. | |
547 | * This routine does not return. | |
548 | */ | |
549 | ||
550 | public printstatus() | |
551 | { | |
ca69b757 ML |
552 | int status; |
553 | ||
b0edae1c ML |
554 | if (process->status == FINISHED) { |
555 | exit(0); | |
9a3bab7a | 556 | } else { |
2fd0f574 | 557 | setcurfunc(whatblock(pc)); |
b0edae1c ML |
558 | getsrcpos(); |
559 | if (process->signo == SIGINT) { | |
560 | isstopped = true; | |
561 | printerror(); | |
562 | } else if (isbperr() and isstopped) { | |
563 | printf("stopped "); | |
86d0cc79 ML |
564 | printloc(); |
565 | putchar('\n'); | |
b0edae1c | 566 | if (curline > 0) { |
b0edae1c ML |
567 | printlines(curline, curline); |
568 | } else { | |
b0edae1c ML |
569 | printinst(pc, pc); |
570 | } | |
571 | erecover(); | |
9a3bab7a | 572 | } else { |
b0edae1c | 573 | fixintr(); |
9a3bab7a ML |
574 | isstopped = true; |
575 | printerror(); | |
576 | } | |
577 | } | |
578 | } | |
579 | ||
86d0cc79 ML |
580 | /* |
581 | * Print out the current location in the debuggee. | |
582 | */ | |
583 | ||
584 | public printloc() | |
585 | { | |
586 | printf("in "); | |
587 | printname(stdout, curfunc); | |
588 | putchar(' '); | |
8ee6535a | 589 | if (curline > 0 and not useInstLoc) { |
86d0cc79 ML |
590 | printsrcpos(); |
591 | } else { | |
8ee6535a ML |
592 | useInstLoc = false; |
593 | curline = 0; | |
86d0cc79 ML |
594 | printf("at 0x%x", pc); |
595 | } | |
596 | } | |
597 | ||
9a3bab7a ML |
598 | /* |
599 | * Some functions for testing the state of the process. | |
600 | */ | |
601 | ||
602 | public Boolean notstarted(p) | |
603 | Process p; | |
604 | { | |
605 | return (Boolean) (p->status == NOTSTARTED); | |
606 | } | |
607 | ||
608 | public Boolean isfinished(p) | |
609 | Process p; | |
610 | { | |
611 | return (Boolean) (p->status == FINISHED); | |
612 | } | |
613 | ||
614 | /* | |
0022c355 ML |
615 | * Predicate to test if the reason the process stopped was because |
616 | * of a breakpoint. If so, as a side effect clear the local copy of | |
617 | * signal handler associated with process. We must do this so as to | |
618 | * not confuse future stepping or continuing by possibly concluding | |
619 | * the process should continue with a SIGTRAP handler. | |
9a3bab7a ML |
620 | */ |
621 | ||
0022c355 ML |
622 | public boolean isbperr() |
623 | { | |
624 | Process p; | |
625 | boolean b; | |
626 | ||
627 | p = process; | |
628 | if (p->status == STOPPED and p->signo == SIGTRAP) { | |
629 | b = true; | |
630 | p->sigstatus = 0; | |
631 | } else { | |
632 | b = false; | |
633 | } | |
634 | return b; | |
635 | } | |
636 | ||
637 | /* | |
638 | * Return the signal number that stopped the process. | |
639 | */ | |
640 | ||
641 | public integer errnum (p) | |
9a3bab7a ML |
642 | Process p; |
643 | { | |
644 | return p->signo; | |
645 | } | |
646 | ||
0022c355 ML |
647 | /* |
648 | * Return the signal code associated with the signal. | |
649 | */ | |
650 | ||
651 | public integer errcode (p) | |
57a9bb29 SL |
652 | Process p; |
653 | { | |
654 | return p->sigcode; | |
655 | } | |
656 | ||
9a3bab7a ML |
657 | /* |
658 | * Return the termination code of the process. | |
659 | */ | |
660 | ||
0022c355 | 661 | public integer exitcode (p) |
9a3bab7a ML |
662 | Process p; |
663 | { | |
664 | return p->exitval; | |
665 | } | |
666 | ||
667 | /* | |
668 | * These routines are used to access the debuggee process from | |
669 | * outside this module. | |
670 | * | |
671 | * They invoke "pio" which eventually leads to a call to "ptrace". | |
8ee6535a ML |
672 | * The system generates an I/O error when a ptrace fails. During reads |
673 | * these are ignored, during writes they are reported as an error, and | |
674 | * for anything else they cause a fatal error. | |
9a3bab7a ML |
675 | */ |
676 | ||
677 | extern Intfunc *onsyserr(); | |
678 | ||
679 | private badaddr; | |
8ee6535a | 680 | private read_err(), write_err(); |
9a3bab7a ML |
681 | |
682 | /* | |
683 | * Read from the process' instruction area. | |
684 | */ | |
685 | ||
686 | public iread(buff, addr, nbytes) | |
687 | char *buff; | |
688 | Address addr; | |
689 | int nbytes; | |
690 | { | |
691 | Intfunc *f; | |
692 | ||
8ee6535a | 693 | f = onsyserr(EIO, read_err); |
9a3bab7a ML |
694 | badaddr = addr; |
695 | if (coredump) { | |
696 | coredump_readtext(buff, addr, nbytes); | |
697 | } else { | |
698 | pio(process, PREAD, TEXTSEG, buff, addr, nbytes); | |
699 | } | |
700 | onsyserr(EIO, f); | |
701 | } | |
702 | ||
703 | /* | |
704 | * Write to the process' instruction area, usually in order to set | |
705 | * or unset a breakpoint. | |
706 | */ | |
707 | ||
708 | public iwrite(buff, addr, nbytes) | |
709 | char *buff; | |
710 | Address addr; | |
711 | int nbytes; | |
712 | { | |
713 | Intfunc *f; | |
714 | ||
715 | if (coredump) { | |
716 | error("no process to write to"); | |
717 | } | |
8ee6535a | 718 | f = onsyserr(EIO, write_err); |
9a3bab7a ML |
719 | badaddr = addr; |
720 | pio(process, PWRITE, TEXTSEG, buff, addr, nbytes); | |
721 | onsyserr(EIO, f); | |
722 | } | |
723 | ||
724 | /* | |
725 | * Read for the process' data area. | |
726 | */ | |
727 | ||
728 | public dread(buff, addr, nbytes) | |
729 | char *buff; | |
730 | Address addr; | |
731 | int nbytes; | |
732 | { | |
733 | Intfunc *f; | |
734 | ||
9a3bab7a ML |
735 | badaddr = addr; |
736 | if (coredump) { | |
0022c355 | 737 | f = onsyserr(EFAULT, read_err); |
9a3bab7a | 738 | coredump_readdata(buff, addr, nbytes); |
0022c355 | 739 | onsyserr(EFAULT, f); |
9a3bab7a | 740 | } else { |
0022c355 | 741 | f = onsyserr(EIO, read_err); |
9a3bab7a | 742 | pio(process, PREAD, DATASEG, buff, addr, nbytes); |
0022c355 | 743 | onsyserr(EIO, f); |
9a3bab7a | 744 | } |
9a3bab7a ML |
745 | } |
746 | ||
747 | /* | |
748 | * Write to the process' data area. | |
749 | */ | |
750 | ||
751 | public dwrite(buff, addr, nbytes) | |
752 | char *buff; | |
753 | Address addr; | |
754 | int nbytes; | |
755 | { | |
756 | Intfunc *f; | |
757 | ||
758 | if (coredump) { | |
759 | error("no process to write to"); | |
760 | } | |
8ee6535a | 761 | f = onsyserr(EIO, write_err); |
9a3bab7a ML |
762 | badaddr = addr; |
763 | pio(process, PWRITE, DATASEG, buff, addr, nbytes); | |
764 | onsyserr(EIO, f); | |
765 | } | |
766 | ||
767 | /* | |
8ee6535a ML |
768 | * Trap for errors in reading or writing to a process. |
769 | * The current approach is to "ignore" read errors and complain | |
770 | * bitterly about write errors. | |
9a3bab7a ML |
771 | */ |
772 | ||
8ee6535a | 773 | private read_err() |
9a3bab7a | 774 | { |
ae743e15 | 775 | /* |
8ee6535a | 776 | * Ignore. |
ae743e15 | 777 | */ |
9a3bab7a ML |
778 | } |
779 | ||
8ee6535a ML |
780 | private write_err() |
781 | { | |
782 | error("can't write to process (address 0x%x)", badaddr); | |
783 | } | |
784 | ||
9a3bab7a ML |
785 | /* |
786 | * Ptrace interface. | |
787 | */ | |
788 | ||
789 | /* | |
790 | * This magic macro enables us to look at the process' registers | |
8ee6535a | 791 | * in its user structure. |
9a3bab7a ML |
792 | */ |
793 | ||
794 | #define regloc(reg) (ctob(UPAGES) + ( sizeof(int) * (reg) )) | |
795 | ||
796 | #define WMASK (~(sizeof(Word) - 1)) | |
797 | #define cachehash(addr) ((unsigned) ((addr >> 2) % CSIZE)) | |
798 | ||
799 | #define FIRSTSIG SIGINT | |
800 | #define LASTSIG SIGQUIT | |
801 | #define ischild(pid) ((pid) == 0) | |
0022c355 | 802 | #define traceme() ptrace(0, 0, 0, 0) |
9a3bab7a ML |
803 | #define setrep(n) (1 << ((n)-1)) |
804 | #define istraced(p) (p->sigset&setrep(p->signo)) | |
805 | ||
0022c355 ML |
806 | /* |
807 | * Ptrace options (specified in first argument). | |
808 | */ | |
809 | ||
810 | #define UREAD 3 /* read from process's user structure */ | |
811 | #define UWRITE 6 /* write to process's user structure */ | |
812 | #define IREAD 1 /* read from process's instruction space */ | |
813 | #define IWRITE 4 /* write to process's instruction space */ | |
814 | #define DREAD 2 /* read from process's data space */ | |
815 | #define DWRITE 5 /* write to process's data space */ | |
816 | #define CONT 7 /* continue stopped process */ | |
817 | #define SSTEP 9 /* continue for approximately one instruction */ | |
818 | #define PKILL 8 /* terminate the process */ | |
819 | ||
9a3bab7a ML |
820 | /* |
821 | * Start up a new process by forking and exec-ing the | |
822 | * given argument list, returning when the process is loaded | |
823 | * and ready to execute. The PROCESS information (pointed to | |
824 | * by the first argument) is appropriately filled. | |
825 | * | |
826 | * If the given PROCESS structure is associated with an already running | |
827 | * process, we terminate it. | |
828 | */ | |
829 | ||
830 | /* VARARGS2 */ | |
831 | private pstart(p, argv, infile, outfile) | |
832 | Process p; | |
833 | String argv[]; | |
834 | String infile; | |
835 | String outfile; | |
836 | { | |
837 | int status; | |
9a3bab7a | 838 | |
2fd0f574 SL |
839 | if (p->pid != 0) { |
840 | pterm(p); | |
0022c355 | 841 | cacheflush(p); |
9a3bab7a | 842 | } |
0022c355 | 843 | fflush(stdout); |
9a3bab7a | 844 | psigtrace(p, SIGTRAP, true); |
ca69b757 ML |
845 | p->pid = vfork(); |
846 | if (p->pid == -1) { | |
9a3bab7a ML |
847 | panic("can't fork"); |
848 | } | |
849 | if (ischild(p->pid)) { | |
0022c355 | 850 | nocatcherrs(); |
9a3bab7a ML |
851 | traceme(); |
852 | if (infile != nil) { | |
2fd0f574 | 853 | infrom(infile); |
9a3bab7a ML |
854 | } |
855 | if (outfile != nil) { | |
2fd0f574 | 856 | outto(outfile); |
9a3bab7a | 857 | } |
e0a80343 | 858 | execv(argv[0], argv); |
86d0cc79 | 859 | _exit(1); |
9a3bab7a ML |
860 | } |
861 | pwait(p->pid, &status); | |
862 | getinfo(p, status); | |
863 | if (p->status != STOPPED) { | |
0022c355 ML |
864 | beginerrmsg(); |
865 | fprintf(stderr, "warning: cannot execute %s\n", argv[0]); | |
866 | } else { | |
867 | ptraced(p->pid); | |
9a3bab7a ML |
868 | } |
869 | } | |
870 | ||
2fd0f574 SL |
871 | /* |
872 | * Terminate a ptrace'd process. | |
873 | */ | |
874 | ||
875 | public pterm (p) | |
876 | Process p; | |
877 | { | |
878 | integer status; | |
879 | ||
880 | if (p != nil and p->pid != 0) { | |
0022c355 | 881 | ptrace(PKILL, p->pid, 0, 0); |
2fd0f574 SL |
882 | pwait(p->pid, &status); |
883 | unptraced(p->pid); | |
884 | } | |
885 | } | |
886 | ||
9a3bab7a | 887 | /* |
36fd36ba ML |
888 | * Continue a stopped process. The first argument points to a Process |
889 | * structure. Before the process is restarted it's user area is modified | |
890 | * according to the values in the structure. When this routine finishes, | |
9a3bab7a ML |
891 | * the structure has the new values from the process's user area. |
892 | * | |
893 | * Pcont terminates when the process stops with a signal pending that | |
894 | * is being traced (via psigtrace), or when the process terminates. | |
895 | */ | |
896 | ||
36fd36ba | 897 | private pcont(p, signo) |
9a3bab7a | 898 | Process p; |
36fd36ba | 899 | int signo; |
9a3bab7a | 900 | { |
2fd0f574 | 901 | int s, status; |
9a3bab7a ML |
902 | |
903 | if (p->pid == 0) { | |
0022c355 | 904 | error("program is not active"); |
9a3bab7a | 905 | } |
2fd0f574 | 906 | s = signo; |
9a3bab7a | 907 | do { |
2fd0f574 SL |
908 | setinfo(p, s); |
909 | if (traceexec) { | |
910 | printf("!! pcont from 0x%x with signal %d (%d)\n", | |
911 | p->reg[PROGCTR], s, p->signo); | |
912 | fflush(stdout); | |
913 | } | |
9a3bab7a | 914 | sigs_off(); |
0022c355 | 915 | if (ptrace(CONT, p->pid, p->reg[PROGCTR], p->signo) < 0) { |
ca69b757 | 916 | panic("error %d trying to continue process", errno); |
9a3bab7a ML |
917 | } |
918 | pwait(p->pid, &status); | |
919 | sigs_on(); | |
920 | getinfo(p, status); | |
0022c355 ML |
921 | if (p->status == STOPPED and traceexec and not istraced(p)) { |
922 | printf("!! ignored signal %d at 0x%x\n", | |
923 | p->signo, p->reg[PROGCTR]); | |
2fd0f574 SL |
924 | fflush(stdout); |
925 | } | |
926 | s = p->signo; | |
9a3bab7a | 927 | } while (p->status == STOPPED and not istraced(p)); |
2fd0f574 SL |
928 | if (traceexec) { |
929 | printf("!! pcont to 0x%x on signal %d\n", p->reg[PROGCTR], p->signo); | |
930 | fflush(stdout); | |
931 | } | |
9a3bab7a ML |
932 | } |
933 | ||
934 | /* | |
935 | * Single step as best ptrace can. | |
936 | */ | |
937 | ||
2fd0f574 | 938 | public pstep(p, signo) |
9a3bab7a | 939 | Process p; |
2fd0f574 | 940 | integer signo; |
9a3bab7a | 941 | { |
0022c355 | 942 | int s, status; |
9a3bab7a | 943 | |
0022c355 ML |
944 | s = signo; |
945 | do { | |
946 | setinfo(p, s); | |
947 | if (traceexec) { | |
948 | printf("!! pstep from 0x%x with signal %d (%d)\n", | |
949 | p->reg[PROGCTR], s, p->signo); | |
950 | fflush(stdout); | |
951 | } | |
952 | sigs_off(); | |
953 | if (ptrace(SSTEP, p->pid, p->reg[PROGCTR], p->signo) < 0) { | |
954 | panic("error %d trying to step process", errno); | |
955 | } | |
956 | pwait(p->pid, &status); | |
957 | sigs_on(); | |
958 | getinfo(p, status); | |
959 | if (p->status == STOPPED and traceexec and not istraced(p)) { | |
960 | printf("!! pstep ignored signal %d at 0x%x\n", | |
961 | p->signo, p->reg[PROGCTR]); | |
962 | fflush(stdout); | |
963 | } | |
964 | s = p->signo; | |
965 | } while (p->status == STOPPED and not istraced(p)); | |
2fd0f574 | 966 | if (traceexec) { |
0022c355 ML |
967 | printf("!! pstep to 0x%x on signal %d\n", |
968 | p->reg[PROGCTR], p->signo); | |
2fd0f574 SL |
969 | fflush(stdout); |
970 | } | |
971 | if (p->status != STOPPED) { | |
0022c355 ML |
972 | if (p->exitval == 0) { |
973 | error("program exited\n"); | |
974 | } else { | |
975 | error("program exited with code %d\n", p->exitval); | |
976 | } | |
2fd0f574 | 977 | } |
9a3bab7a ML |
978 | } |
979 | ||
980 | /* | |
981 | * Return from execution when the given signal is pending. | |
982 | */ | |
983 | ||
984 | public psigtrace(p, sig, sw) | |
985 | Process p; | |
986 | int sig; | |
987 | Boolean sw; | |
988 | { | |
989 | if (sw) { | |
990 | p->sigset |= setrep(sig); | |
991 | } else { | |
992 | p->sigset &= ~setrep(sig); | |
993 | } | |
994 | } | |
995 | ||
996 | /* | |
997 | * Don't catch any signals. | |
998 | * Particularly useful when letting a process finish uninhibited. | |
999 | */ | |
1000 | ||
1001 | public unsetsigtraces(p) | |
1002 | Process p; | |
1003 | { | |
1004 | p->sigset = 0; | |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * Turn off attention to signals not being caught. | |
1009 | */ | |
1010 | ||
1011 | private Intfunc *sigfunc[NSIG]; | |
1012 | ||
1013 | private sigs_off() | |
1014 | { | |
1015 | register int i; | |
1016 | ||
1017 | for (i = FIRSTSIG; i < LASTSIG; i++) { | |
1018 | if (i != SIGKILL) { | |
1019 | sigfunc[i] = signal(i, SIG_IGN); | |
1020 | } | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Turn back on attention to signals. | |
1026 | */ | |
1027 | ||
1028 | private sigs_on() | |
1029 | { | |
1030 | register int i; | |
1031 | ||
1032 | for (i = FIRSTSIG; i < LASTSIG; i++) { | |
1033 | if (i != SIGKILL) { | |
1034 | signal(i, sigfunc[i]); | |
1035 | } | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * Get process information from user area. | |
1041 | */ | |
1042 | ||
1043 | private int rloc[] ={ | |
1044 | R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, AP, FP, SP, PC | |
1045 | }; | |
1046 | ||
1047 | private getinfo(p, status) | |
1048 | register Process p; | |
1049 | register int status; | |
1050 | { | |
1051 | register int i; | |
2fd0f574 | 1052 | Address addr; |
9a3bab7a ML |
1053 | |
1054 | p->signo = (status&0177); | |
1055 | p->exitval = ((status >> 8)&0377); | |
1056 | if (p->signo != STOPPED) { | |
1057 | p->status = FINISHED; | |
8ee6535a | 1058 | p->pid = 0; |
2fd0f574 | 1059 | p->reg[PROGCTR] = 0; |
9a3bab7a ML |
1060 | } else { |
1061 | p->status = p->signo; | |
1062 | p->signo = p->exitval; | |
0022c355 | 1063 | p->sigcode = ptrace(UREAD, p->pid, &((struct user *) 0)->u_code, 0); |
9a3bab7a | 1064 | p->exitval = 0; |
0022c355 | 1065 | p->mask = ptrace(UREAD, p->pid, regloc(PS), 0); |
9a3bab7a | 1066 | for (i = 0; i < NREG; i++) { |
0022c355 | 1067 | p->reg[i] = ptrace(UREAD, p->pid, regloc(rloc[i]), 0); |
9a3bab7a ML |
1068 | p->oreg[i] = p->reg[i]; |
1069 | } | |
5870175c | 1070 | savetty(stdout, &(p->ttyinfo)); |
2fd0f574 | 1071 | addr = (Address) &(((struct user *) 0)->u_signal[p->signo]); |
0022c355 | 1072 | p->sigstatus = (Address) ptrace(UREAD, p->pid, addr, 0); |
9a3bab7a ML |
1073 | } |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * Set process's user area information from given process structure. | |
1078 | */ | |
1079 | ||
36fd36ba | 1080 | private setinfo(p, signo) |
9a3bab7a | 1081 | register Process p; |
36fd36ba | 1082 | int signo; |
9a3bab7a ML |
1083 | { |
1084 | register int i; | |
1085 | register int r; | |
1086 | ||
8ee6535a | 1087 | if (signo == DEFSIG) { |
2fd0f574 | 1088 | if (istraced(p) and (p->sigstatus == 0 or p->sigstatus == 1)) { |
8ee6535a ML |
1089 | p->signo = 0; |
1090 | } | |
1091 | } else { | |
36fd36ba | 1092 | p->signo = signo; |
9a3bab7a ML |
1093 | } |
1094 | for (i = 0; i < NREG; i++) { | |
1095 | if ((r = p->reg[i]) != p->oreg[i]) { | |
0022c355 | 1096 | ptrace(UWRITE, p->pid, regloc(rloc[i]), r); |
9a3bab7a ML |
1097 | } |
1098 | } | |
5870175c | 1099 | restoretty(stdout, &(p->ttyinfo)); |
9a3bab7a ML |
1100 | } |
1101 | ||
2fd0f574 SL |
1102 | /* |
1103 | * Return the address associated with the current signal. | |
1104 | * (Plus two since the address points to the beginning of a procedure). | |
1105 | */ | |
1106 | ||
1107 | public Address usignal (p) | |
1108 | Process p; | |
1109 | { | |
1110 | Address r; | |
1111 | ||
1112 | r = p->sigstatus; | |
1113 | if (r != 0 and r != 1) { | |
1114 | r += 2; | |
1115 | } | |
1116 | return r; | |
1117 | } | |
1118 | ||
9a3bab7a ML |
1119 | /* |
1120 | * Structure for reading and writing by words, but dealing with bytes. | |
1121 | */ | |
1122 | ||
1123 | typedef union { | |
1124 | Word pword; | |
1125 | Byte pbyte[sizeof(Word)]; | |
1126 | } Pword; | |
1127 | ||
1128 | /* | |
1129 | * Read (write) from (to) the process' address space. | |
1130 | * We must deal with ptrace's inability to look anywhere other | |
1131 | * than at a word boundary. | |
1132 | */ | |
1133 | ||
1134 | private Word fetch(); | |
1135 | private store(); | |
1136 | ||
1137 | private pio(p, op, seg, buff, addr, nbytes) | |
1138 | Process p; | |
1139 | PioOp op; | |
1140 | PioSeg seg; | |
1141 | char *buff; | |
1142 | Address addr; | |
1143 | int nbytes; | |
1144 | { | |
1145 | register int i; | |
1146 | register Address newaddr; | |
1147 | register char *cp; | |
1148 | char *bufend; | |
1149 | Pword w; | |
1150 | Address wordaddr; | |
1151 | int byteoff; | |
1152 | ||
1153 | if (p->status != STOPPED) { | |
1154 | error("program is not active"); | |
1155 | } | |
1156 | cp = buff; | |
1157 | newaddr = addr; | |
1158 | wordaddr = (newaddr&WMASK); | |
1159 | if (wordaddr != newaddr) { | |
1160 | w.pword = fetch(p, seg, wordaddr); | |
1161 | for (i = newaddr - wordaddr; i < sizeof(Word) and nbytes > 0; i++) { | |
1162 | if (op == PREAD) { | |
1163 | *cp++ = w.pbyte[i]; | |
1164 | } else { | |
1165 | w.pbyte[i] = *cp++; | |
1166 | } | |
1167 | nbytes--; | |
1168 | } | |
1169 | if (op == PWRITE) { | |
1170 | store(p, seg, wordaddr, w.pword); | |
1171 | } | |
1172 | newaddr = wordaddr + sizeof(Word); | |
1173 | } | |
1174 | byteoff = (nbytes&(~WMASK)); | |
1175 | nbytes -= byteoff; | |
1176 | bufend = cp + nbytes; | |
1177 | while (cp < bufend) { | |
1178 | if (op == PREAD) { | |
1179 | *((Word *) cp) = fetch(p, seg, newaddr); | |
1180 | } else { | |
1181 | store(p, seg, newaddr, *((Word *) cp)); | |
1182 | } | |
1183 | cp += sizeof(Word); | |
1184 | newaddr += sizeof(Word); | |
1185 | } | |
1186 | if (byteoff > 0) { | |
1187 | w.pword = fetch(p, seg, newaddr); | |
1188 | for (i = 0; i < byteoff; i++) { | |
1189 | if (op == PREAD) { | |
1190 | *cp++ = w.pbyte[i]; | |
1191 | } else { | |
1192 | w.pbyte[i] = *cp++; | |
1193 | } | |
1194 | } | |
1195 | if (op == PWRITE) { | |
1196 | store(p, seg, newaddr, w.pword); | |
1197 | } | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Get a word from a process at the given address. | |
1203 | * The address is assumed to be on a word boundary. | |
1204 | * | |
1205 | * A simple cache scheme is used to avoid redundant ptrace calls | |
1206 | * to the instruction space since it is assumed to be pure. | |
1207 | * | |
1208 | * It is necessary to use a write-through scheme so that | |
1209 | * breakpoints right next to each other don't interfere. | |
1210 | */ | |
1211 | ||
1212 | private Integer nfetchs, nreads, nwrites; | |
1213 | ||
1214 | private Word fetch(p, seg, addr) | |
1215 | Process p; | |
1216 | PioSeg seg; | |
1217 | register int addr; | |
1218 | { | |
1219 | register CacheWord *wp; | |
1220 | register Word w; | |
1221 | ||
1222 | switch (seg) { | |
1223 | case TEXTSEG: | |
1224 | ++nfetchs; | |
1225 | wp = &p->word[cachehash(addr)]; | |
1226 | if (addr == 0 or wp->addr != addr) { | |
1227 | ++nreads; | |
0022c355 | 1228 | w = ptrace(IREAD, p->pid, addr, 0); |
9a3bab7a ML |
1229 | wp->addr = addr; |
1230 | wp->val = w; | |
1231 | } else { | |
1232 | w = wp->val; | |
1233 | } | |
1234 | break; | |
1235 | ||
1236 | case DATASEG: | |
0022c355 | 1237 | w = ptrace(DREAD, p->pid, addr, 0); |
9a3bab7a ML |
1238 | break; |
1239 | ||
1240 | default: | |
1241 | panic("fetch: bad seg %d", seg); | |
1242 | /* NOTREACHED */ | |
1243 | } | |
1244 | return w; | |
1245 | } | |
1246 | ||
1247 | /* | |
1248 | * Put a word into the process' address space at the given address. | |
1249 | * The address is assumed to be on a word boundary. | |
1250 | */ | |
1251 | ||
1252 | private store(p, seg, addr, data) | |
1253 | Process p; | |
1254 | PioSeg seg; | |
1255 | int addr; | |
1256 | Word data; | |
1257 | { | |
1258 | register CacheWord *wp; | |
1259 | ||
1260 | switch (seg) { | |
1261 | case TEXTSEG: | |
1262 | ++nwrites; | |
1263 | wp = &p->word[cachehash(addr)]; | |
1264 | wp->addr = addr; | |
1265 | wp->val = data; | |
0022c355 | 1266 | ptrace(IWRITE, p->pid, addr, data); |
9a3bab7a ML |
1267 | break; |
1268 | ||
1269 | case DATASEG: | |
0022c355 | 1270 | ptrace(DWRITE, p->pid, addr, data); |
9a3bab7a ML |
1271 | break; |
1272 | ||
1273 | default: | |
1274 | panic("store: bad seg %d", seg); | |
1275 | /* NOTREACHED */ | |
1276 | } | |
1277 | } | |
1278 | ||
0022c355 ML |
1279 | /* |
1280 | * Flush the instruction cache associated with a process. | |
1281 | */ | |
1282 | ||
1283 | private cacheflush (p) | |
1284 | Process p; | |
1285 | { | |
1286 | bzero(p->word, sizeof(p->word)); | |
1287 | } | |
1288 | ||
9a3bab7a ML |
1289 | public printptraceinfo() |
1290 | { | |
1291 | printf("%d fetchs, %d reads, %d writes\n", nfetchs, nreads, nwrites); | |
1292 | } | |
1293 | ||
1294 | /* | |
2fd0f574 SL |
1295 | * Redirect input. |
1296 | * Assuming this is called from a child, we should be careful to avoid | |
1297 | * (possibly) shared standard I/O buffers. | |
1298 | */ | |
1299 | ||
1300 | private infrom (filename) | |
1301 | String filename; | |
1302 | { | |
1303 | Fileid in; | |
1304 | ||
1305 | in = open(filename, 0); | |
1306 | if (in == -1) { | |
1307 | write(2, "can't read ", 11); | |
1308 | write(2, filename, strlen(filename)); | |
1309 | write(2, "\n", 1); | |
1310 | _exit(1); | |
1311 | } | |
1312 | fswap(0, in); | |
1313 | } | |
1314 | ||
1315 | /* | |
1316 | * Redirect standard output. | |
1317 | * Same assumptions as for "infrom" above. | |
1318 | */ | |
1319 | ||
1320 | private outto (filename) | |
1321 | String filename; | |
1322 | { | |
1323 | Fileid out; | |
1324 | ||
1325 | out = creat(filename, 0666); | |
1326 | if (out == -1) { | |
1327 | write(2, "can't write ", 12); | |
1328 | write(2, filename, strlen(filename)); | |
1329 | write(2, "\n", 1); | |
1330 | _exit(1); | |
1331 | } | |
1332 | fswap(1, out); | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * Swap file numbers, useful for redirecting standard input or output. | |
9a3bab7a ML |
1337 | */ |
1338 | ||
1339 | private fswap(oldfd, newfd) | |
2fd0f574 SL |
1340 | Fileid oldfd; |
1341 | Fileid newfd; | |
9a3bab7a ML |
1342 | { |
1343 | if (oldfd != newfd) { | |
1344 | close(oldfd); | |
1345 | dup(newfd); | |
1346 | close(newfd); | |
1347 | } | |
1348 | } | |
f7adfe8e | 1349 | |
f7adfe8e | 1350 | /* |
0022c355 | 1351 | * Signal name manipulation. |
f7adfe8e | 1352 | */ |
0022c355 ML |
1353 | |
1354 | private String signames[NSIG] = { | |
1355 | 0, | |
1356 | "HUP", "INT", "QUIT", "ILL", "TRAP", | |
1357 | "IOT", "EMT", "FPE", "KILL", "BUS", | |
1358 | "SEGV", "SYS", "PIPE", "ALRM", "TERM", | |
1359 | 0, "STOP", "TSTP", "CONT", "CHLD", | |
1360 | "TTIN", "TTOU", "TINT", "XCPU", "XFSZ", | |
f7adfe8e SL |
1361 | }; |
1362 | ||
1363 | /* | |
0022c355 ML |
1364 | * Get the signal number associated with a given name. |
1365 | * The name is first translated to upper case if necessary. | |
f7adfe8e | 1366 | */ |
0022c355 ML |
1367 | |
1368 | public integer siglookup (s) | |
f7adfe8e SL |
1369 | String s; |
1370 | { | |
0022c355 ML |
1371 | register char *p, *q; |
1372 | char buf[100]; | |
1373 | integer i; | |
1374 | ||
1375 | p = s; | |
1376 | q = buf; | |
1377 | while (*p != '\0') { | |
1378 | if (*p >= 'a' and *p <= 'z') { | |
1379 | *q = (*p - 'a') + 'A'; | |
1380 | } else { | |
1381 | *q = *p; | |
1382 | } | |
1383 | ++p; | |
1384 | ++q; | |
1385 | } | |
1386 | *q = '\0'; | |
1387 | p = buf; | |
1388 | if (buf[0] == 'S' and buf[1] == 'I' and buf[2] == 'G') { | |
1389 | p += 3; | |
1390 | } | |
1391 | i = 1; | |
1392 | for (;;) { | |
1393 | if (i >= sizeof(signames) div sizeof(signames[0])) { | |
1394 | error("signal \"%s\" unknown", s); | |
1395 | i = 0; | |
1396 | break; | |
1397 | } | |
1398 | if (signames[i] != nil and streq(signames[i], p)) { | |
1399 | break; | |
1400 | } | |
1401 | ++i; | |
1402 | } | |
1403 | return i; | |
f7adfe8e SL |
1404 | } |
1405 | ||
1406 | /* | |
0022c355 ML |
1407 | * Print all signals being ignored by the debugger. |
1408 | * These signals are auotmatically | |
f7adfe8e SL |
1409 | * passed on to the debugged process. |
1410 | */ | |
0022c355 ML |
1411 | |
1412 | public printsigsignored (p) | |
57a9bb29 | 1413 | Process p; |
f7adfe8e | 1414 | { |
57a9bb29 | 1415 | printsigs(~p->sigset); |
f7adfe8e SL |
1416 | } |
1417 | ||
1418 | /* | |
1419 | * Print all signals being intercepted by | |
1420 | * the debugger for the specified process. | |
1421 | */ | |
0022c355 | 1422 | |
57a9bb29 SL |
1423 | public printsigscaught(p) |
1424 | Process p; | |
f7adfe8e | 1425 | { |
57a9bb29 | 1426 | printsigs(p->sigset); |
f7adfe8e SL |
1427 | } |
1428 | ||
0022c355 ML |
1429 | private printsigs (set) |
1430 | integer set; | |
57a9bb29 | 1431 | { |
0022c355 ML |
1432 | integer s; |
1433 | char separator[2]; | |
1434 | ||
1435 | separator[0] = '\0'; | |
1436 | for (s = 1; s < sizeof(signames) div sizeof(signames[0]); s++) { | |
1437 | if (set & setrep(s)) { | |
1438 | if (signames[s] != nil) { | |
1439 | printf("%s%s", separator, signames[s]); | |
1440 | separator[0] = ' '; | |
1441 | separator[1] = '\0'; | |
1442 | } | |
57a9bb29 | 1443 | } |
0022c355 ML |
1444 | } |
1445 | if (separator[0] == ' ') { | |
57a9bb29 | 1446 | putchar('\n'); |
57a9bb29 SL |
1447 | } |
1448 | } |