Commit | Line | Data |
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9a3bab7a ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
4e067a2c | 3 | static char sccsid[] = "@(#)process.c 1.9 %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 | ||
81 | #define MAXNCMDARGS 10 /* maximum number of arguments to RUN */ | |
82 | ||
83 | private Boolean just_started; | |
84 | private int argc; | |
85 | private String argv[MAXNCMDARGS]; | |
86 | private String infile, outfile; | |
87 | ||
88 | /* | |
89 | * Initialize process information. | |
90 | */ | |
91 | ||
92 | public process_init() | |
93 | { | |
94 | register Integer i; | |
95 | Char buf[10]; | |
96 | ||
97 | process = &pbuf; | |
98 | process->status = (coredump) ? STOPPED : NOTSTARTED; | |
99 | setsigtrace(); | |
100 | for (i = 0; i < NREG; i++) { | |
101 | sprintf(buf, "$r%d", i); | |
102 | defregname(identname(buf, false), i); | |
103 | } | |
104 | defregname(identname("$ap", true), ARGP); | |
105 | defregname(identname("$fp", true), FRP); | |
106 | defregname(identname("$sp", true), STKP); | |
107 | defregname(identname("$pc", true), PROGCTR); | |
108 | if (coredump) { | |
109 | coredump_readin(process->mask, process->reg, process->signo); | |
4e067a2c ML |
110 | pc = process->reg[PROGCTR]; |
111 | getsrcpos(); | |
9a3bab7a | 112 | } |
4e067a2c | 113 | arginit(); |
9a3bab7a ML |
114 | } |
115 | ||
116 | /* | |
117 | * Routines to get at process information from outside this module. | |
118 | */ | |
119 | ||
120 | public Word reg(n) | |
121 | Integer n; | |
122 | { | |
123 | register Word w; | |
124 | ||
125 | if (n == NREG) { | |
126 | w = process->mask; | |
127 | } else { | |
128 | w = process->reg[n]; | |
129 | } | |
130 | return w; | |
131 | } | |
132 | ||
133 | public setreg(n, w) | |
134 | Integer n; | |
135 | Word w; | |
136 | { | |
137 | process->reg[n] = w; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Begin execution. | |
142 | * | |
143 | * We set a breakpoint at the end of the code so that the | |
144 | * process data doesn't disappear after the program terminates. | |
145 | */ | |
146 | ||
147 | private Boolean remade(); | |
148 | ||
149 | public start(argv, infile, outfile) | |
150 | String argv[]; | |
151 | String infile, outfile; | |
152 | { | |
153 | String pargv[4]; | |
154 | Node cond; | |
155 | ||
156 | if (coredump) { | |
157 | coredump = false; | |
158 | fclose(corefile); | |
159 | coredump_close(); | |
160 | } | |
161 | if (argv == nil) { | |
162 | argv = pargv; | |
163 | pargv[0] = objname; | |
164 | pargv[1] = nil; | |
165 | } else { | |
166 | argv[argc] = nil; | |
167 | } | |
168 | if (remade(objname)) { | |
169 | reinit(argv, infile, outfile); | |
170 | } | |
171 | pstart(process, argv, infile, outfile); | |
172 | if (process->status == STOPPED) { | |
173 | pc = 0; | |
174 | curfunc = program; | |
175 | if (objsize != 0) { | |
176 | cond = build(O_EQ, build(O_SYM, pcsym), build(O_LCON, lastaddr())); | |
177 | event_once(cond, buildcmdlist(build(O_ENDX))); | |
178 | } | |
179 | } | |
180 | } | |
181 | ||
182 | /* | |
183 | * Check to see if the object file has changed since the symbolic | |
184 | * information last was read. | |
185 | */ | |
186 | ||
187 | private time_t modtime; | |
188 | ||
189 | private Boolean remade(filename) | |
190 | String filename; | |
191 | { | |
192 | struct stat s; | |
193 | Boolean b; | |
194 | ||
195 | stat(filename, &s); | |
196 | b = (Boolean) (modtime != 0 and modtime < s.st_mtime); | |
197 | modtime = s.st_mtime; | |
198 | return b; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Set up what signals we want to trace. | |
203 | */ | |
204 | ||
205 | private setsigtrace() | |
206 | { | |
207 | register Integer i; | |
208 | register Process p; | |
209 | ||
210 | p = process; | |
211 | for (i = 1; i <= NSIG; i++) { | |
212 | psigtrace(p, i, true); | |
213 | } | |
214 | psigtrace(p, SIGHUP, false); | |
215 | psigtrace(p, SIGKILL, false); | |
216 | psigtrace(p, SIGALRM, false); | |
217 | psigtrace(p, SIGTSTP, false); | |
218 | psigtrace(p, SIGCONT, false); | |
219 | psigtrace(p, SIGCHLD, false); | |
220 | } | |
221 | ||
222 | /* | |
223 | * Initialize the argument list. | |
224 | */ | |
225 | ||
226 | public arginit() | |
227 | { | |
228 | infile = nil; | |
229 | outfile = nil; | |
230 | argv[0] = objname; | |
231 | argc = 1; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Add an argument to the list for the debuggee. | |
236 | */ | |
237 | ||
238 | public newarg(arg) | |
239 | String arg; | |
240 | { | |
241 | if (argc >= MAXNCMDARGS) { | |
242 | error("too many arguments"); | |
243 | } | |
244 | argv[argc++] = arg; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Set the standard input for the debuggee. | |
249 | */ | |
250 | ||
251 | public inarg(filename) | |
252 | String filename; | |
253 | { | |
254 | if (infile != nil) { | |
255 | error("multiple input redirects"); | |
256 | } | |
257 | infile = filename; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Set the standard output for the debuggee. | |
262 | * Probably should check to avoid overwriting an existing file. | |
263 | */ | |
264 | ||
265 | public outarg(filename) | |
266 | String filename; | |
267 | { | |
268 | if (outfile != nil) { | |
269 | error("multiple output redirect"); | |
270 | } | |
271 | outfile = filename; | |
272 | } | |
273 | ||
274 | /* | |
275 | * Start debuggee executing. | |
276 | */ | |
277 | ||
278 | public run() | |
279 | { | |
280 | process->status = STOPPED; | |
281 | fixbps(); | |
282 | curline = 0; | |
283 | start(argv, infile, outfile); | |
284 | just_started = true; | |
285 | isstopped = false; | |
286 | cont(); | |
287 | } | |
288 | ||
289 | /* | |
290 | * Continue execution wherever we left off. | |
291 | * | |
292 | * Note that this routine never returns. Eventually bpact() will fail | |
293 | * and we'll call printstatus or step will call it. | |
294 | */ | |
295 | ||
296 | typedef int Intfunc(); | |
297 | ||
298 | private Intfunc *dbintr; | |
299 | private intr(); | |
300 | ||
301 | #define succeeds == true | |
302 | #define fails == false | |
303 | ||
36fd36ba ML |
304 | public cont(signo) |
305 | int signo; | |
9a3bab7a ML |
306 | { |
307 | dbintr = signal(SIGINT, intr); | |
308 | if (just_started) { | |
309 | just_started = false; | |
310 | } else { | |
311 | if (not isstopped) { | |
312 | error("can't continue execution"); | |
313 | } | |
314 | isstopped = false; | |
36fd36ba | 315 | stepover(); |
9a3bab7a ML |
316 | } |
317 | for (;;) { | |
318 | if (single_stepping) { | |
319 | printnews(); | |
320 | } else { | |
321 | setallbps(); | |
36fd36ba | 322 | resume(signo); |
9a3bab7a ML |
323 | unsetallbps(); |
324 | if (bpact() fails) { | |
325 | printstatus(); | |
326 | } | |
327 | } | |
36fd36ba | 328 | stepover(); |
9a3bab7a ML |
329 | } |
330 | /* NOTREACHED */ | |
331 | } | |
332 | ||
333 | /* | |
334 | * This routine is called if we get an interrupt while "running" px | |
335 | * but actually in the debugger. Could happen, for example, while | |
336 | * processing breakpoints. | |
337 | * | |
338 | * We basically just want to keep going; the assumption is | |
339 | * that when the process resumes it will get the interrupt | |
340 | * which will then be handled. | |
341 | */ | |
342 | ||
343 | private intr() | |
344 | { | |
345 | signal(SIGINT, intr); | |
346 | } | |
347 | ||
348 | public fixintr() | |
349 | { | |
350 | signal(SIGINT, dbintr); | |
351 | } | |
352 | ||
353 | /* | |
354 | * Resume execution. | |
355 | */ | |
356 | ||
36fd36ba ML |
357 | public resume(signo) |
358 | int signo; | |
9a3bab7a ML |
359 | { |
360 | register Process p; | |
361 | ||
362 | p = process; | |
363 | if (traceexec) { | |
364 | printf("execution resumes at pc 0x%x\n", process->reg[PROGCTR]); | |
365 | fflush(stdout); | |
366 | } | |
36fd36ba | 367 | pcont(p, signo); |
9a3bab7a ML |
368 | pc = process->reg[PROGCTR]; |
369 | if (traceexec) { | |
370 | printf("execution stops at pc 0x%x on sig %d\n", | |
371 | process->reg[PROGCTR], p->signo); | |
372 | fflush(stdout); | |
373 | } | |
e0a80343 | 374 | if (p->status != STOPPED) { |
36fd36ba ML |
375 | if (p->signo != 0) { |
376 | error("program terminated by signal %d", p->signo); | |
377 | } else { | |
378 | error("program unexpectedly exited with %d", p->exitval); | |
379 | } | |
e0a80343 | 380 | } |
9a3bab7a ML |
381 | } |
382 | ||
383 | /* | |
384 | * Continue execution up to the next source line. | |
385 | * | |
386 | * There are two ways to define the next source line depending on what | |
387 | * is desired when a procedure or function call is encountered. Step | |
388 | * stops at the beginning of the procedure or call; next skips over it. | |
389 | */ | |
390 | ||
391 | /* | |
392 | * Stepc is what is called when the step command is given. | |
393 | * It has to play with the "isstopped" information. | |
394 | */ | |
395 | ||
396 | public stepc() | |
397 | { | |
398 | if (not isstopped) { | |
399 | error("can't continue execution"); | |
400 | } | |
401 | isstopped = false; | |
402 | dostep(false); | |
403 | isstopped = true; | |
404 | } | |
405 | ||
406 | public next() | |
407 | { | |
408 | if (not isstopped) { | |
409 | error("can't continue execution"); | |
410 | } | |
411 | isstopped = false; | |
412 | dostep(true); | |
413 | isstopped = true; | |
414 | } | |
415 | ||
36fd36ba ML |
416 | /* |
417 | * Single-step over the current machine instruction. | |
418 | * | |
419 | * If we're single-stepping by source line we want to step to the | |
420 | * next source line. Otherwise we're going to continue so there's | |
421 | * no reason to do all the work necessary to single-step to the next | |
422 | * source line. | |
423 | */ | |
424 | ||
425 | private stepover() | |
9a3bab7a | 426 | { |
36fd36ba ML |
427 | Boolean b; |
428 | ||
429 | if (single_stepping) { | |
430 | dostep(false); | |
431 | } else { | |
432 | b = inst_tracing; | |
433 | inst_tracing = true; | |
434 | dostep(false); | |
435 | inst_tracing = b; | |
436 | } | |
9a3bab7a ML |
437 | } |
438 | ||
439 | /* | |
440 | * Resume execution up to the given address. It is assumed that | |
441 | * no breakpoints exist between the current address and the one | |
442 | * we're stepping to. This saves us from setting all the breakpoints. | |
443 | */ | |
444 | ||
445 | public stepto(addr) | |
446 | Address addr; | |
447 | { | |
448 | setbp(addr); | |
36fd36ba | 449 | resume(0); |
9a3bab7a ML |
450 | unsetbp(addr); |
451 | if (not isbperr()) { | |
452 | printstatus(); | |
453 | } | |
454 | } | |
455 | ||
456 | /* | |
457 | * Print the status of the process. | |
458 | * This routine does not return. | |
459 | */ | |
460 | ||
461 | public printstatus() | |
462 | { | |
b0edae1c ML |
463 | if (process->status == FINISHED) { |
464 | exit(0); | |
9a3bab7a | 465 | } else { |
b0edae1c ML |
466 | curfunc = whatblock(pc); |
467 | getsrcpos(); | |
468 | if (process->signo == SIGINT) { | |
469 | isstopped = true; | |
470 | printerror(); | |
471 | } else if (isbperr() and isstopped) { | |
472 | printf("stopped "); | |
86d0cc79 ML |
473 | printloc(); |
474 | putchar('\n'); | |
b0edae1c | 475 | if (curline > 0) { |
b0edae1c ML |
476 | printlines(curline, curline); |
477 | } else { | |
b0edae1c ML |
478 | printinst(pc, pc); |
479 | } | |
480 | erecover(); | |
9a3bab7a | 481 | } else { |
b0edae1c ML |
482 | fixbps(); |
483 | fixintr(); | |
9a3bab7a ML |
484 | isstopped = true; |
485 | printerror(); | |
486 | } | |
487 | } | |
488 | } | |
489 | ||
86d0cc79 ML |
490 | /* |
491 | * Print out the current location in the debuggee. | |
492 | */ | |
493 | ||
494 | public printloc() | |
495 | { | |
496 | printf("in "); | |
497 | printname(stdout, curfunc); | |
498 | putchar(' '); | |
499 | if (curline > 0) { | |
500 | printsrcpos(); | |
501 | } else { | |
502 | printf("at 0x%x", pc); | |
503 | } | |
504 | } | |
505 | ||
9a3bab7a ML |
506 | /* |
507 | * Some functions for testing the state of the process. | |
508 | */ | |
509 | ||
510 | public Boolean notstarted(p) | |
511 | Process p; | |
512 | { | |
513 | return (Boolean) (p->status == NOTSTARTED); | |
514 | } | |
515 | ||
516 | public Boolean isfinished(p) | |
517 | Process p; | |
518 | { | |
519 | return (Boolean) (p->status == FINISHED); | |
520 | } | |
521 | ||
522 | /* | |
523 | * Return the signal number which stopped the process. | |
524 | */ | |
525 | ||
526 | public Integer errnum(p) | |
527 | Process p; | |
528 | { | |
529 | return p->signo; | |
530 | } | |
531 | ||
532 | /* | |
533 | * Return the termination code of the process. | |
534 | */ | |
535 | ||
536 | public Integer exitcode(p) | |
537 | Process p; | |
538 | { | |
539 | return p->exitval; | |
540 | } | |
541 | ||
542 | /* | |
543 | * These routines are used to access the debuggee process from | |
544 | * outside this module. | |
545 | * | |
546 | * They invoke "pio" which eventually leads to a call to "ptrace". | |
ae743e15 ML |
547 | * The system generates an I/O error when a ptrace fails, we assume |
548 | * during a read/write to the process that such an error is due to | |
549 | * a misguided address and ignore it. | |
9a3bab7a ML |
550 | */ |
551 | ||
552 | extern Intfunc *onsyserr(); | |
553 | ||
554 | private badaddr; | |
555 | private rwerr(); | |
556 | ||
557 | /* | |
558 | * Read from the process' instruction area. | |
559 | */ | |
560 | ||
561 | public iread(buff, addr, nbytes) | |
562 | char *buff; | |
563 | Address addr; | |
564 | int nbytes; | |
565 | { | |
566 | Intfunc *f; | |
567 | ||
568 | f = onsyserr(EIO, rwerr); | |
569 | badaddr = addr; | |
570 | if (coredump) { | |
571 | coredump_readtext(buff, addr, nbytes); | |
572 | } else { | |
573 | pio(process, PREAD, TEXTSEG, buff, addr, nbytes); | |
574 | } | |
575 | onsyserr(EIO, f); | |
576 | } | |
577 | ||
578 | /* | |
579 | * Write to the process' instruction area, usually in order to set | |
580 | * or unset a breakpoint. | |
581 | */ | |
582 | ||
583 | public iwrite(buff, addr, nbytes) | |
584 | char *buff; | |
585 | Address addr; | |
586 | int nbytes; | |
587 | { | |
588 | Intfunc *f; | |
589 | ||
590 | if (coredump) { | |
591 | error("no process to write to"); | |
592 | } | |
593 | f = onsyserr(EIO, rwerr); | |
594 | badaddr = addr; | |
595 | pio(process, PWRITE, TEXTSEG, buff, addr, nbytes); | |
596 | onsyserr(EIO, f); | |
597 | } | |
598 | ||
599 | /* | |
600 | * Read for the process' data area. | |
601 | */ | |
602 | ||
603 | public dread(buff, addr, nbytes) | |
604 | char *buff; | |
605 | Address addr; | |
606 | int nbytes; | |
607 | { | |
608 | Intfunc *f; | |
609 | ||
610 | f = onsyserr(EIO, rwerr); | |
611 | badaddr = addr; | |
612 | if (coredump) { | |
613 | coredump_readdata(buff, addr, nbytes); | |
614 | } else { | |
615 | pio(process, PREAD, DATASEG, buff, addr, nbytes); | |
616 | } | |
617 | onsyserr(EIO, f); | |
618 | } | |
619 | ||
620 | /* | |
621 | * Write to the process' data area. | |
622 | */ | |
623 | ||
624 | public dwrite(buff, addr, nbytes) | |
625 | char *buff; | |
626 | Address addr; | |
627 | int nbytes; | |
628 | { | |
629 | Intfunc *f; | |
630 | ||
631 | if (coredump) { | |
632 | error("no process to write to"); | |
633 | } | |
634 | f = onsyserr(EIO, rwerr); | |
635 | badaddr = addr; | |
636 | pio(process, PWRITE, DATASEG, buff, addr, nbytes); | |
637 | onsyserr(EIO, f); | |
638 | } | |
639 | ||
640 | /* | |
641 | * Error handler. | |
642 | */ | |
643 | ||
644 | private rwerr() | |
645 | { | |
ae743e15 ML |
646 | /* |
647 | * Current response is to ignore the error and let the result | |
648 | * (-1) ripple back up to the process. | |
649 | * | |
9a3bab7a | 650 | error("bad read/write process address 0x%x", badaddr); |
ae743e15 | 651 | */ |
9a3bab7a ML |
652 | } |
653 | ||
654 | /* | |
655 | * Ptrace interface. | |
656 | */ | |
657 | ||
658 | /* | |
659 | * This magic macro enables us to look at the process' registers | |
660 | * in its user structure. Very gross. | |
661 | */ | |
662 | ||
663 | #define regloc(reg) (ctob(UPAGES) + ( sizeof(int) * (reg) )) | |
664 | ||
665 | #define WMASK (~(sizeof(Word) - 1)) | |
666 | #define cachehash(addr) ((unsigned) ((addr >> 2) % CSIZE)) | |
667 | ||
668 | #define FIRSTSIG SIGINT | |
669 | #define LASTSIG SIGQUIT | |
670 | #define ischild(pid) ((pid) == 0) | |
671 | #define traceme() ptrace(0, 0, 0, 0) | |
672 | #define setrep(n) (1 << ((n)-1)) | |
673 | #define istraced(p) (p->sigset&setrep(p->signo)) | |
674 | ||
675 | /* | |
676 | * Ptrace options (specified in first argument). | |
677 | */ | |
678 | ||
679 | #define UREAD 3 /* read from process's user structure */ | |
680 | #define UWRITE 6 /* write to process's user structure */ | |
681 | #define IREAD 1 /* read from process's instruction space */ | |
682 | #define IWRITE 4 /* write to process's instruction space */ | |
683 | #define DREAD 2 /* read from process's data space */ | |
684 | #define DWRITE 5 /* write to process's data space */ | |
685 | #define CONT 7 /* continue stopped process */ | |
686 | #define SSTEP 9 /* continue for approximately one instruction */ | |
687 | #define PKILL 8 /* terminate the process */ | |
688 | ||
689 | /* | |
690 | * Start up a new process by forking and exec-ing the | |
691 | * given argument list, returning when the process is loaded | |
692 | * and ready to execute. The PROCESS information (pointed to | |
693 | * by the first argument) is appropriately filled. | |
694 | * | |
695 | * If the given PROCESS structure is associated with an already running | |
696 | * process, we terminate it. | |
697 | */ | |
698 | ||
699 | /* VARARGS2 */ | |
700 | private pstart(p, argv, infile, outfile) | |
701 | Process p; | |
702 | String argv[]; | |
703 | String infile; | |
704 | String outfile; | |
705 | { | |
706 | int status; | |
9a3bab7a ML |
707 | |
708 | if (p->pid != 0) { /* child already running? */ | |
709 | ptrace(PKILL, p->pid, 0, 0); /* ... kill it! */ | |
710 | } | |
711 | psigtrace(p, SIGTRAP, true); | |
86d0cc79 | 712 | if ((p->pid = vfork()) == -1) { |
9a3bab7a ML |
713 | panic("can't fork"); |
714 | } | |
715 | if (ischild(p->pid)) { | |
86d0cc79 ML |
716 | Fileid in, out; |
717 | ||
9a3bab7a ML |
718 | traceme(); |
719 | if (infile != nil) { | |
86d0cc79 ML |
720 | in = open(infile, 0); |
721 | if (in == -1) { | |
722 | write(2, "can't read ", 11); | |
723 | write(2, infile, strlen(infile)); | |
724 | write(2, "\n", 1); | |
725 | _exit(1); | |
9a3bab7a | 726 | } |
86d0cc79 | 727 | fswap(0, in); |
9a3bab7a ML |
728 | } |
729 | if (outfile != nil) { | |
86d0cc79 ML |
730 | out = creat(outfile, 0666); |
731 | if (out == -1) { | |
732 | write(2, "can't write ", 12); | |
733 | write(2, outfile, strlen(outfile)); | |
734 | write(2, "\n", 1); | |
735 | _exit(1); | |
9a3bab7a | 736 | } |
86d0cc79 | 737 | fswap(1, out); |
9a3bab7a | 738 | } |
e0a80343 | 739 | execv(argv[0], argv); |
86d0cc79 ML |
740 | write(2, "can't exec ", 11); |
741 | write(2, argv[0], strlen(argv[0])); | |
742 | write(2, "\n", 1); | |
743 | _exit(1); | |
9a3bab7a ML |
744 | } |
745 | pwait(p->pid, &status); | |
746 | getinfo(p, status); | |
747 | if (p->status != STOPPED) { | |
748 | error("program could not begin execution"); | |
749 | } | |
750 | } | |
751 | ||
752 | /* | |
36fd36ba ML |
753 | * Continue a stopped process. The first argument points to a Process |
754 | * structure. Before the process is restarted it's user area is modified | |
755 | * according to the values in the structure. When this routine finishes, | |
9a3bab7a ML |
756 | * the structure has the new values from the process's user area. |
757 | * | |
758 | * Pcont terminates when the process stops with a signal pending that | |
759 | * is being traced (via psigtrace), or when the process terminates. | |
760 | */ | |
761 | ||
36fd36ba | 762 | private pcont(p, signo) |
9a3bab7a | 763 | Process p; |
36fd36ba | 764 | int signo; |
9a3bab7a ML |
765 | { |
766 | int status; | |
767 | ||
768 | if (p->pid == 0) { | |
769 | error("program not active"); | |
770 | } | |
771 | do { | |
36fd36ba | 772 | setinfo(p, signo); |
9a3bab7a ML |
773 | sigs_off(); |
774 | if (ptrace(CONT, p->pid, p->reg[PROGCTR], p->signo) < 0) { | |
775 | panic("can't continue process"); | |
776 | } | |
777 | pwait(p->pid, &status); | |
778 | sigs_on(); | |
779 | getinfo(p, status); | |
780 | } while (p->status == STOPPED and not istraced(p)); | |
781 | } | |
782 | ||
783 | /* | |
784 | * Single step as best ptrace can. | |
785 | */ | |
786 | ||
787 | public pstep(p) | |
788 | Process p; | |
789 | { | |
790 | int status; | |
791 | ||
36fd36ba | 792 | setinfo(p, 0); |
9a3bab7a ML |
793 | sigs_off(); |
794 | ptrace(SSTEP, p->pid, p->reg[PROGCTR], p->signo); | |
795 | pwait(p->pid, &status); | |
796 | sigs_on(); | |
797 | getinfo(p, status); | |
798 | } | |
799 | ||
800 | /* | |
801 | * Return from execution when the given signal is pending. | |
802 | */ | |
803 | ||
804 | public psigtrace(p, sig, sw) | |
805 | Process p; | |
806 | int sig; | |
807 | Boolean sw; | |
808 | { | |
809 | if (sw) { | |
810 | p->sigset |= setrep(sig); | |
811 | } else { | |
812 | p->sigset &= ~setrep(sig); | |
813 | } | |
814 | } | |
815 | ||
816 | /* | |
817 | * Don't catch any signals. | |
818 | * Particularly useful when letting a process finish uninhibited. | |
819 | */ | |
820 | ||
821 | public unsetsigtraces(p) | |
822 | Process p; | |
823 | { | |
824 | p->sigset = 0; | |
825 | } | |
826 | ||
827 | /* | |
828 | * Turn off attention to signals not being caught. | |
829 | */ | |
830 | ||
831 | private Intfunc *sigfunc[NSIG]; | |
832 | ||
833 | private sigs_off() | |
834 | { | |
835 | register int i; | |
836 | ||
837 | for (i = FIRSTSIG; i < LASTSIG; i++) { | |
838 | if (i != SIGKILL) { | |
839 | sigfunc[i] = signal(i, SIG_IGN); | |
840 | } | |
841 | } | |
842 | } | |
843 | ||
844 | /* | |
845 | * Turn back on attention to signals. | |
846 | */ | |
847 | ||
848 | private sigs_on() | |
849 | { | |
850 | register int i; | |
851 | ||
852 | for (i = FIRSTSIG; i < LASTSIG; i++) { | |
853 | if (i != SIGKILL) { | |
854 | signal(i, sigfunc[i]); | |
855 | } | |
856 | } | |
857 | } | |
858 | ||
859 | /* | |
860 | * Get process information from user area. | |
861 | */ | |
862 | ||
863 | private int rloc[] ={ | |
864 | R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, AP, FP, SP, PC | |
865 | }; | |
866 | ||
867 | private getinfo(p, status) | |
868 | register Process p; | |
869 | register int status; | |
870 | { | |
871 | register int i; | |
872 | ||
873 | p->signo = (status&0177); | |
874 | p->exitval = ((status >> 8)&0377); | |
875 | if (p->signo != STOPPED) { | |
876 | p->status = FINISHED; | |
877 | } else { | |
878 | p->status = p->signo; | |
879 | p->signo = p->exitval; | |
880 | p->exitval = 0; | |
881 | p->mask = ptrace(UREAD, p->pid, regloc(PS), 0); | |
882 | for (i = 0; i < NREG; i++) { | |
883 | p->reg[i] = ptrace(UREAD, p->pid, regloc(rloc[i]), 0); | |
884 | p->oreg[i] = p->reg[i]; | |
885 | } | |
5870175c | 886 | savetty(stdout, &(p->ttyinfo)); |
9a3bab7a ML |
887 | } |
888 | } | |
889 | ||
890 | /* | |
891 | * Set process's user area information from given process structure. | |
892 | */ | |
893 | ||
36fd36ba | 894 | private setinfo(p, signo) |
9a3bab7a | 895 | register Process p; |
36fd36ba | 896 | int signo; |
9a3bab7a ML |
897 | { |
898 | register int i; | |
899 | register int r; | |
900 | ||
901 | if (istraced(p)) { | |
36fd36ba | 902 | p->signo = signo; |
9a3bab7a ML |
903 | } |
904 | for (i = 0; i < NREG; i++) { | |
905 | if ((r = p->reg[i]) != p->oreg[i]) { | |
906 | ptrace(UWRITE, p->pid, regloc(rloc[i]), r); | |
907 | } | |
908 | } | |
5870175c | 909 | restoretty(stdout, &(p->ttyinfo)); |
9a3bab7a ML |
910 | } |
911 | ||
912 | /* | |
913 | * Structure for reading and writing by words, but dealing with bytes. | |
914 | */ | |
915 | ||
916 | typedef union { | |
917 | Word pword; | |
918 | Byte pbyte[sizeof(Word)]; | |
919 | } Pword; | |
920 | ||
921 | /* | |
922 | * Read (write) from (to) the process' address space. | |
923 | * We must deal with ptrace's inability to look anywhere other | |
924 | * than at a word boundary. | |
925 | */ | |
926 | ||
927 | private Word fetch(); | |
928 | private store(); | |
929 | ||
930 | private pio(p, op, seg, buff, addr, nbytes) | |
931 | Process p; | |
932 | PioOp op; | |
933 | PioSeg seg; | |
934 | char *buff; | |
935 | Address addr; | |
936 | int nbytes; | |
937 | { | |
938 | register int i; | |
939 | register Address newaddr; | |
940 | register char *cp; | |
941 | char *bufend; | |
942 | Pword w; | |
943 | Address wordaddr; | |
944 | int byteoff; | |
945 | ||
946 | if (p->status != STOPPED) { | |
947 | error("program is not active"); | |
948 | } | |
949 | cp = buff; | |
950 | newaddr = addr; | |
951 | wordaddr = (newaddr&WMASK); | |
952 | if (wordaddr != newaddr) { | |
953 | w.pword = fetch(p, seg, wordaddr); | |
954 | for (i = newaddr - wordaddr; i < sizeof(Word) and nbytes > 0; i++) { | |
955 | if (op == PREAD) { | |
956 | *cp++ = w.pbyte[i]; | |
957 | } else { | |
958 | w.pbyte[i] = *cp++; | |
959 | } | |
960 | nbytes--; | |
961 | } | |
962 | if (op == PWRITE) { | |
963 | store(p, seg, wordaddr, w.pword); | |
964 | } | |
965 | newaddr = wordaddr + sizeof(Word); | |
966 | } | |
967 | byteoff = (nbytes&(~WMASK)); | |
968 | nbytes -= byteoff; | |
969 | bufend = cp + nbytes; | |
970 | while (cp < bufend) { | |
971 | if (op == PREAD) { | |
972 | *((Word *) cp) = fetch(p, seg, newaddr); | |
973 | } else { | |
974 | store(p, seg, newaddr, *((Word *) cp)); | |
975 | } | |
976 | cp += sizeof(Word); | |
977 | newaddr += sizeof(Word); | |
978 | } | |
979 | if (byteoff > 0) { | |
980 | w.pword = fetch(p, seg, newaddr); | |
981 | for (i = 0; i < byteoff; i++) { | |
982 | if (op == PREAD) { | |
983 | *cp++ = w.pbyte[i]; | |
984 | } else { | |
985 | w.pbyte[i] = *cp++; | |
986 | } | |
987 | } | |
988 | if (op == PWRITE) { | |
989 | store(p, seg, newaddr, w.pword); | |
990 | } | |
991 | } | |
992 | } | |
993 | ||
994 | /* | |
995 | * Get a word from a process at the given address. | |
996 | * The address is assumed to be on a word boundary. | |
997 | * | |
998 | * A simple cache scheme is used to avoid redundant ptrace calls | |
999 | * to the instruction space since it is assumed to be pure. | |
1000 | * | |
1001 | * It is necessary to use a write-through scheme so that | |
1002 | * breakpoints right next to each other don't interfere. | |
1003 | */ | |
1004 | ||
1005 | private Integer nfetchs, nreads, nwrites; | |
1006 | ||
1007 | private Word fetch(p, seg, addr) | |
1008 | Process p; | |
1009 | PioSeg seg; | |
1010 | register int addr; | |
1011 | { | |
1012 | register CacheWord *wp; | |
1013 | register Word w; | |
1014 | ||
1015 | switch (seg) { | |
1016 | case TEXTSEG: | |
1017 | ++nfetchs; | |
1018 | wp = &p->word[cachehash(addr)]; | |
1019 | if (addr == 0 or wp->addr != addr) { | |
1020 | ++nreads; | |
1021 | w = ptrace(IREAD, p->pid, addr, 0); | |
1022 | wp->addr = addr; | |
1023 | wp->val = w; | |
1024 | } else { | |
1025 | w = wp->val; | |
1026 | } | |
1027 | break; | |
1028 | ||
1029 | case DATASEG: | |
1030 | w = ptrace(DREAD, p->pid, addr, 0); | |
1031 | break; | |
1032 | ||
1033 | default: | |
1034 | panic("fetch: bad seg %d", seg); | |
1035 | /* NOTREACHED */ | |
1036 | } | |
1037 | return w; | |
1038 | } | |
1039 | ||
1040 | /* | |
1041 | * Put a word into the process' address space at the given address. | |
1042 | * The address is assumed to be on a word boundary. | |
1043 | */ | |
1044 | ||
1045 | private store(p, seg, addr, data) | |
1046 | Process p; | |
1047 | PioSeg seg; | |
1048 | int addr; | |
1049 | Word data; | |
1050 | { | |
1051 | register CacheWord *wp; | |
1052 | ||
1053 | switch (seg) { | |
1054 | case TEXTSEG: | |
1055 | ++nwrites; | |
1056 | wp = &p->word[cachehash(addr)]; | |
1057 | wp->addr = addr; | |
1058 | wp->val = data; | |
1059 | ptrace(IWRITE, p->pid, addr, data); | |
1060 | break; | |
1061 | ||
1062 | case DATASEG: | |
1063 | ptrace(DWRITE, p->pid, addr, data); | |
1064 | break; | |
1065 | ||
1066 | default: | |
1067 | panic("store: bad seg %d", seg); | |
1068 | /* NOTREACHED */ | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | public printptraceinfo() | |
1073 | { | |
1074 | printf("%d fetchs, %d reads, %d writes\n", nfetchs, nreads, nwrites); | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * Swap file numbers so as to redirect standard input and output. | |
1079 | */ | |
1080 | ||
1081 | private fswap(oldfd, newfd) | |
1082 | int oldfd; | |
1083 | int newfd; | |
1084 | { | |
1085 | if (oldfd != newfd) { | |
1086 | close(oldfd); | |
1087 | dup(newfd); | |
1088 | close(newfd); | |
1089 | } | |
1090 | } |