1 /* Target signal translation functions for GDB.
2 Copyright (C) 1990-2021 Free Software Foundation, Inc.
3 Contributed by Cygnus Support.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include "common-defs.h"
21
22 #ifdef HAVE_SIGNAL_H
23 #include <signal.h>
24 #endif
25
26 #include "gdb_signals.h"
27
28 struct gdbarch;
29
30 /* Always use __SIGRTMIN if it's available. SIGRTMIN is the lowest
31 _available_ realtime signal, not the lowest supported; glibc takes
32 several for its own use. */
33
34 #ifndef REALTIME_LO
35 # if defined(__SIGRTMIN)
36 # define REALTIME_LO __SIGRTMIN
37 # define REALTIME_HI (__SIGRTMAX + 1)
38 # elif defined(SIGRTMIN)
39 # define REALTIME_LO SIGRTMIN
40 # define REALTIME_HI (SIGRTMAX + 1)
41 # endif
42 #endif
43
44 /* This table must match in order and size the signals in enum
45 gdb_signal. */
46
47 static const struct {
48 const char *symbol;
49 const char *name;
50 const char *string;
51 } signals [] =
52 {
53 #define SET(symbol, constant, name, string) { #symbol, name, string },
54 #include "gdb/signals.def"
55 #undef SET
56 };
57
58 const char *
gdb_signal_to_symbol_string(enum gdb_signal sig)59 gdb_signal_to_symbol_string (enum gdb_signal sig)
60 {
61 gdb_assert ((int) sig >= GDB_SIGNAL_FIRST && (int) sig <= GDB_SIGNAL_LAST);
62
63 return signals[sig].symbol;
64 }
65
66 /* Return the string for a signal. */
67 const char *
gdb_signal_to_string(enum gdb_signal sig)68 gdb_signal_to_string (enum gdb_signal sig)
69 {
70 if ((int) sig >= GDB_SIGNAL_FIRST && (int) sig <= GDB_SIGNAL_LAST)
71 return signals[sig].string;
72 else
73 return signals[GDB_SIGNAL_UNKNOWN].string;
74 }
75
76 /* Return the name for a signal. */
77 const char *
gdb_signal_to_name(enum gdb_signal sig)78 gdb_signal_to_name (enum gdb_signal sig)
79 {
80 if ((int) sig >= GDB_SIGNAL_FIRST && (int) sig <= GDB_SIGNAL_LAST
81 && signals[sig].name != NULL)
82 return signals[sig].name;
83 else
84 /* I think the code which prints this will always print it along
85 with the string, so no need to be verbose (very old comment). */
86 return "?";
87 }
88
89 /* Given a name, return its signal. */
90 enum gdb_signal
gdb_signal_from_name(const char * name)91 gdb_signal_from_name (const char *name)
92 {
93 enum gdb_signal sig;
94
95 /* It's possible we also should allow "SIGCLD" as well as "SIGCHLD"
96 for GDB_SIGNAL_SIGCHLD. SIGIOT, on the other hand, is more
97 questionable; seems like by now people should call it SIGABRT
98 instead. */
99
100 /* This ugly cast brought to you by the native VAX compiler. */
101 for (sig = GDB_SIGNAL_HUP;
102 sig < GDB_SIGNAL_LAST;
103 sig = (enum gdb_signal) ((int) sig + 1))
104 if (signals[sig].name != NULL
105 && strcmp (name, signals[sig].name) == 0)
106 return sig;
107 return GDB_SIGNAL_UNKNOWN;
108 }
109
110 /* The following functions are to help certain targets deal
111 with the signal/waitstatus stuff. They could just as well be in
112 a file called native-utils.c or unixwaitstatus-utils.c or whatever. */
113
114 /* Convert host signal to our signals. */
115 enum gdb_signal
gdb_signal_from_host(int hostsig)116 gdb_signal_from_host (int hostsig)
117 {
118 /* A switch statement would make sense but would require special
119 kludges to deal with the cases where more than one signal has the
120 same number. Signals are ordered ANSI-standard signals first,
121 other signals second, with signals in each block ordered by their
122 numerical values on a typical POSIX platform. */
123
124 if (hostsig == 0)
125 return GDB_SIGNAL_0;
126
127 /* SIGINT, SIGILL, SIGABRT, SIGFPE, SIGSEGV and SIGTERM
128 are ANSI-standard signals and are always available. */
129 if (hostsig == SIGINT)
130 return GDB_SIGNAL_INT;
131 if (hostsig == SIGILL)
132 return GDB_SIGNAL_ILL;
133 if (hostsig == SIGABRT)
134 return GDB_SIGNAL_ABRT;
135 if (hostsig == SIGFPE)
136 return GDB_SIGNAL_FPE;
137 if (hostsig == SIGSEGV)
138 return GDB_SIGNAL_SEGV;
139 if (hostsig == SIGTERM)
140 return GDB_SIGNAL_TERM;
141
142 /* All other signals need preprocessor conditionals. */
143 #if defined (SIGHUP)
144 if (hostsig == SIGHUP)
145 return GDB_SIGNAL_HUP;
146 #endif
147 #if defined (SIGQUIT)
148 if (hostsig == SIGQUIT)
149 return GDB_SIGNAL_QUIT;
150 #endif
151 #if defined (SIGTRAP)
152 if (hostsig == SIGTRAP)
153 return GDB_SIGNAL_TRAP;
154 #endif
155 #if defined (SIGEMT)
156 if (hostsig == SIGEMT)
157 return GDB_SIGNAL_EMT;
158 #endif
159 #if defined (SIGKILL)
160 if (hostsig == SIGKILL)
161 return GDB_SIGNAL_KILL;
162 #endif
163 #if defined (SIGBUS)
164 if (hostsig == SIGBUS)
165 return GDB_SIGNAL_BUS;
166 #endif
167 #if defined (SIGSYS)
168 if (hostsig == SIGSYS)
169 return GDB_SIGNAL_SYS;
170 #endif
171 #if defined (SIGPIPE)
172 if (hostsig == SIGPIPE)
173 return GDB_SIGNAL_PIPE;
174 #endif
175 #if defined (SIGALRM)
176 if (hostsig == SIGALRM)
177 return GDB_SIGNAL_ALRM;
178 #endif
179 #if defined (SIGUSR1)
180 if (hostsig == SIGUSR1)
181 return GDB_SIGNAL_USR1;
182 #endif
183 #if defined (SIGUSR2)
184 if (hostsig == SIGUSR2)
185 return GDB_SIGNAL_USR2;
186 #endif
187 #if defined (SIGCLD)
188 if (hostsig == SIGCLD)
189 return GDB_SIGNAL_CHLD;
190 #endif
191 #if defined (SIGCHLD)
192 if (hostsig == SIGCHLD)
193 return GDB_SIGNAL_CHLD;
194 #endif
195 #if defined (SIGPWR)
196 if (hostsig == SIGPWR)
197 return GDB_SIGNAL_PWR;
198 #endif
199 #if defined (SIGWINCH)
200 if (hostsig == SIGWINCH)
201 return GDB_SIGNAL_WINCH;
202 #endif
203 #if defined (SIGURG)
204 if (hostsig == SIGURG)
205 return GDB_SIGNAL_URG;
206 #endif
207 #if defined (SIGIO)
208 if (hostsig == SIGIO)
209 return GDB_SIGNAL_IO;
210 #endif
211 #if defined (SIGPOLL)
212 if (hostsig == SIGPOLL)
213 return GDB_SIGNAL_POLL;
214 #endif
215 #if defined (SIGSTOP)
216 if (hostsig == SIGSTOP)
217 return GDB_SIGNAL_STOP;
218 #endif
219 #if defined (SIGTSTP)
220 if (hostsig == SIGTSTP)
221 return GDB_SIGNAL_TSTP;
222 #endif
223 #if defined (SIGCONT)
224 if (hostsig == SIGCONT)
225 return GDB_SIGNAL_CONT;
226 #endif
227 #if defined (SIGTTIN)
228 if (hostsig == SIGTTIN)
229 return GDB_SIGNAL_TTIN;
230 #endif
231 #if defined (SIGTTOU)
232 if (hostsig == SIGTTOU)
233 return GDB_SIGNAL_TTOU;
234 #endif
235 #if defined (SIGVTALRM)
236 if (hostsig == SIGVTALRM)
237 return GDB_SIGNAL_VTALRM;
238 #endif
239 #if defined (SIGPROF)
240 if (hostsig == SIGPROF)
241 return GDB_SIGNAL_PROF;
242 #endif
243 #if defined (SIGXCPU)
244 if (hostsig == SIGXCPU)
245 return GDB_SIGNAL_XCPU;
246 #endif
247 #if defined (SIGXFSZ)
248 if (hostsig == SIGXFSZ)
249 return GDB_SIGNAL_XFSZ;
250 #endif
251 #if defined (SIGWIND)
252 if (hostsig == SIGWIND)
253 return GDB_SIGNAL_WIND;
254 #endif
255 #if defined (SIGPHONE)
256 if (hostsig == SIGPHONE)
257 return GDB_SIGNAL_PHONE;
258 #endif
259 #if defined (SIGLOST)
260 if (hostsig == SIGLOST)
261 return GDB_SIGNAL_LOST;
262 #endif
263 #if defined (SIGWAITING)
264 if (hostsig == SIGWAITING)
265 return GDB_SIGNAL_WAITING;
266 #endif
267 #if defined (SIGCANCEL)
268 if (hostsig == SIGCANCEL)
269 return GDB_SIGNAL_CANCEL;
270 #endif
271 #if defined (SIGLWP)
272 if (hostsig == SIGLWP)
273 return GDB_SIGNAL_LWP;
274 #endif
275 #if defined (SIGDANGER)
276 if (hostsig == SIGDANGER)
277 return GDB_SIGNAL_DANGER;
278 #endif
279 #if defined (SIGGRANT)
280 if (hostsig == SIGGRANT)
281 return GDB_SIGNAL_GRANT;
282 #endif
283 #if defined (SIGRETRACT)
284 if (hostsig == SIGRETRACT)
285 return GDB_SIGNAL_RETRACT;
286 #endif
287 #if defined (SIGMSG)
288 if (hostsig == SIGMSG)
289 return GDB_SIGNAL_MSG;
290 #endif
291 #if defined (SIGSOUND)
292 if (hostsig == SIGSOUND)
293 return GDB_SIGNAL_SOUND;
294 #endif
295 #if defined (SIGSAK)
296 if (hostsig == SIGSAK)
297 return GDB_SIGNAL_SAK;
298 #endif
299 #if defined (SIGPRIO)
300 if (hostsig == SIGPRIO)
301 return GDB_SIGNAL_PRIO;
302 #endif
303
304 /* Mach exceptions. Assumes that the values for EXC_ are positive! */
305 #if defined (EXC_BAD_ACCESS) && defined (_NSIG)
306 if (hostsig == _NSIG + EXC_BAD_ACCESS)
307 return GDB_EXC_BAD_ACCESS;
308 #endif
309 #if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
310 if (hostsig == _NSIG + EXC_BAD_INSTRUCTION)
311 return GDB_EXC_BAD_INSTRUCTION;
312 #endif
313 #if defined (EXC_ARITHMETIC) && defined (_NSIG)
314 if (hostsig == _NSIG + EXC_ARITHMETIC)
315 return GDB_EXC_ARITHMETIC;
316 #endif
317 #if defined (EXC_EMULATION) && defined (_NSIG)
318 if (hostsig == _NSIG + EXC_EMULATION)
319 return GDB_EXC_EMULATION;
320 #endif
321 #if defined (EXC_SOFTWARE) && defined (_NSIG)
322 if (hostsig == _NSIG + EXC_SOFTWARE)
323 return GDB_EXC_SOFTWARE;
324 #endif
325 #if defined (EXC_BREAKPOINT) && defined (_NSIG)
326 if (hostsig == _NSIG + EXC_BREAKPOINT)
327 return GDB_EXC_BREAKPOINT;
328 #endif
329
330 #if defined (SIGINFO)
331 if (hostsig == SIGINFO)
332 return GDB_SIGNAL_INFO;
333 #endif
334 #if defined (SIGLIBRT)
335 if (hostsig == SIGLIBRT)
336 return GDB_SIGNAL_LIBRT;
337 #endif
338
339 #if defined (REALTIME_LO)
340 if (hostsig >= REALTIME_LO && hostsig < REALTIME_HI)
341 {
342 /* This block of GDB_SIGNAL_REALTIME value is in order. */
343 if (33 <= hostsig && hostsig <= 63)
344 return (enum gdb_signal)
345 (hostsig - 33 + (int) GDB_SIGNAL_REALTIME_33);
346 else if (hostsig == 32)
347 return GDB_SIGNAL_REALTIME_32;
348 else if (64 <= hostsig && hostsig <= 127)
349 return (enum gdb_signal)
350 (hostsig - 64 + (int) GDB_SIGNAL_REALTIME_64);
351 else
352 error (_("GDB bug: target.c (gdb_signal_from_host): "
353 "unrecognized real-time signal"));
354 }
355 #endif
356
357 return GDB_SIGNAL_UNKNOWN;
358 }
359
360 /* Convert a OURSIG (an enum gdb_signal) to the form used by the
361 target operating system (refered to as the ``host'') or zero if the
362 equivalent host signal is not available. Set/clear OURSIG_OK
363 accordingly. */
364
365 static int
do_gdb_signal_to_host(enum gdb_signal oursig,int * oursig_ok)366 do_gdb_signal_to_host (enum gdb_signal oursig,
367 int *oursig_ok)
368 {
369 int retsig;
370 /* Silence the 'not used' warning, for targets that
371 do not support signals. */
372 (void) retsig;
373
374 /* Signals are ordered ANSI-standard signals first, other signals
375 second, with signals in each block ordered by their numerical
376 values on a typical POSIX platform. */
377
378 *oursig_ok = 1;
379 switch (oursig)
380 {
381 case GDB_SIGNAL_0:
382 return 0;
383
384 /* SIGINT, SIGILL, SIGABRT, SIGFPE, SIGSEGV and SIGTERM
385 are ANSI-standard signals and are always available. */
386 case GDB_SIGNAL_INT:
387 return SIGINT;
388 case GDB_SIGNAL_ILL:
389 return SIGILL;
390 case GDB_SIGNAL_ABRT:
391 return SIGABRT;
392 case GDB_SIGNAL_FPE:
393 return SIGFPE;
394 case GDB_SIGNAL_SEGV:
395 return SIGSEGV;
396 case GDB_SIGNAL_TERM:
397 return SIGTERM;
398
399 /* All other signals need preprocessor conditionals. */
400 #if defined (SIGHUP)
401 case GDB_SIGNAL_HUP:
402 return SIGHUP;
403 #endif
404 #if defined (SIGQUIT)
405 case GDB_SIGNAL_QUIT:
406 return SIGQUIT;
407 #endif
408 #if defined (SIGTRAP)
409 case GDB_SIGNAL_TRAP:
410 return SIGTRAP;
411 #endif
412 #if defined (SIGEMT)
413 case GDB_SIGNAL_EMT:
414 return SIGEMT;
415 #endif
416 #if defined (SIGKILL)
417 case GDB_SIGNAL_KILL:
418 return SIGKILL;
419 #endif
420 #if defined (SIGBUS)
421 case GDB_SIGNAL_BUS:
422 return SIGBUS;
423 #endif
424 #if defined (SIGSYS)
425 case GDB_SIGNAL_SYS:
426 return SIGSYS;
427 #endif
428 #if defined (SIGPIPE)
429 case GDB_SIGNAL_PIPE:
430 return SIGPIPE;
431 #endif
432 #if defined (SIGALRM)
433 case GDB_SIGNAL_ALRM:
434 return SIGALRM;
435 #endif
436 #if defined (SIGUSR1)
437 case GDB_SIGNAL_USR1:
438 return SIGUSR1;
439 #endif
440 #if defined (SIGUSR2)
441 case GDB_SIGNAL_USR2:
442 return SIGUSR2;
443 #endif
444 #if defined (SIGCHLD) || defined (SIGCLD)
445 case GDB_SIGNAL_CHLD:
446 #if defined (SIGCHLD)
447 return SIGCHLD;
448 #else
449 return SIGCLD;
450 #endif
451 #endif /* SIGCLD or SIGCHLD */
452 #if defined (SIGPWR)
453 case GDB_SIGNAL_PWR:
454 return SIGPWR;
455 #endif
456 #if defined (SIGWINCH)
457 case GDB_SIGNAL_WINCH:
458 return SIGWINCH;
459 #endif
460 #if defined (SIGURG)
461 case GDB_SIGNAL_URG:
462 return SIGURG;
463 #endif
464 #if defined (SIGIO)
465 case GDB_SIGNAL_IO:
466 return SIGIO;
467 #endif
468 #if defined (SIGPOLL)
469 case GDB_SIGNAL_POLL:
470 return SIGPOLL;
471 #endif
472 #if defined (SIGSTOP)
473 case GDB_SIGNAL_STOP:
474 return SIGSTOP;
475 #endif
476 #if defined (SIGTSTP)
477 case GDB_SIGNAL_TSTP:
478 return SIGTSTP;
479 #endif
480 #if defined (SIGCONT)
481 case GDB_SIGNAL_CONT:
482 return SIGCONT;
483 #endif
484 #if defined (SIGTTIN)
485 case GDB_SIGNAL_TTIN:
486 return SIGTTIN;
487 #endif
488 #if defined (SIGTTOU)
489 case GDB_SIGNAL_TTOU:
490 return SIGTTOU;
491 #endif
492 #if defined (SIGVTALRM)
493 case GDB_SIGNAL_VTALRM:
494 return SIGVTALRM;
495 #endif
496 #if defined (SIGPROF)
497 case GDB_SIGNAL_PROF:
498 return SIGPROF;
499 #endif
500 #if defined (SIGXCPU)
501 case GDB_SIGNAL_XCPU:
502 return SIGXCPU;
503 #endif
504 #if defined (SIGXFSZ)
505 case GDB_SIGNAL_XFSZ:
506 return SIGXFSZ;
507 #endif
508 #if defined (SIGWIND)
509 case GDB_SIGNAL_WIND:
510 return SIGWIND;
511 #endif
512 #if defined (SIGPHONE)
513 case GDB_SIGNAL_PHONE:
514 return SIGPHONE;
515 #endif
516 #if defined (SIGLOST)
517 case GDB_SIGNAL_LOST:
518 return SIGLOST;
519 #endif
520 #if defined (SIGWAITING)
521 case GDB_SIGNAL_WAITING:
522 return SIGWAITING;
523 #endif
524 #if defined (SIGCANCEL)
525 case GDB_SIGNAL_CANCEL:
526 return SIGCANCEL;
527 #endif
528 #if defined (SIGLWP)
529 case GDB_SIGNAL_LWP:
530 return SIGLWP;
531 #endif
532 #if defined (SIGDANGER)
533 case GDB_SIGNAL_DANGER:
534 return SIGDANGER;
535 #endif
536 #if defined (SIGGRANT)
537 case GDB_SIGNAL_GRANT:
538 return SIGGRANT;
539 #endif
540 #if defined (SIGRETRACT)
541 case GDB_SIGNAL_RETRACT:
542 return SIGRETRACT;
543 #endif
544 #if defined (SIGMSG)
545 case GDB_SIGNAL_MSG:
546 return SIGMSG;
547 #endif
548 #if defined (SIGSOUND)
549 case GDB_SIGNAL_SOUND:
550 return SIGSOUND;
551 #endif
552 #if defined (SIGSAK)
553 case GDB_SIGNAL_SAK:
554 return SIGSAK;
555 #endif
556 #if defined (SIGPRIO)
557 case GDB_SIGNAL_PRIO:
558 return SIGPRIO;
559 #endif
560
561 /* Mach exceptions. Assumes that the values for EXC_ are positive! */
562 #if defined (EXC_BAD_ACCESS) && defined (_NSIG)
563 case GDB_EXC_BAD_ACCESS:
564 return _NSIG + EXC_BAD_ACCESS;
565 #endif
566 #if defined (EXC_BAD_INSTRUCTION) && defined (_NSIG)
567 case GDB_EXC_BAD_INSTRUCTION:
568 return _NSIG + EXC_BAD_INSTRUCTION;
569 #endif
570 #if defined (EXC_ARITHMETIC) && defined (_NSIG)
571 case GDB_EXC_ARITHMETIC:
572 return _NSIG + EXC_ARITHMETIC;
573 #endif
574 #if defined (EXC_EMULATION) && defined (_NSIG)
575 case GDB_EXC_EMULATION:
576 return _NSIG + EXC_EMULATION;
577 #endif
578 #if defined (EXC_SOFTWARE) && defined (_NSIG)
579 case GDB_EXC_SOFTWARE:
580 return _NSIG + EXC_SOFTWARE;
581 #endif
582 #if defined (EXC_BREAKPOINT) && defined (_NSIG)
583 case GDB_EXC_BREAKPOINT:
584 return _NSIG + EXC_BREAKPOINT;
585 #endif
586
587 #if defined (SIGINFO)
588 case GDB_SIGNAL_INFO:
589 return SIGINFO;
590 #endif
591 #if defined (SIGLIBRT)
592 case GDB_SIGNAL_LIBRT:
593 return SIGLIBRT;
594 #endif
595
596 default:
597 #if defined (REALTIME_LO)
598 retsig = 0;
599
600 if (oursig >= GDB_SIGNAL_REALTIME_33
601 && oursig <= GDB_SIGNAL_REALTIME_63)
602 {
603 /* This block of signals is continuous, and
604 GDB_SIGNAL_REALTIME_33 is 33 by definition. */
605 retsig = (int) oursig - (int) GDB_SIGNAL_REALTIME_33 + 33;
606 }
607 else if (oursig == GDB_SIGNAL_REALTIME_32)
608 {
609 /* GDB_SIGNAL_REALTIME_32 isn't contiguous with
610 GDB_SIGNAL_REALTIME_33. It is 32 by definition. */
611 retsig = 32;
612 }
613 else if (oursig >= GDB_SIGNAL_REALTIME_64
614 && oursig <= GDB_SIGNAL_REALTIME_127)
615 {
616 /* This block of signals is continuous, and
617 GDB_SIGNAL_REALTIME_64 is 64 by definition. */
618 retsig = (int) oursig - (int) GDB_SIGNAL_REALTIME_64 + 64;
619 }
620
621 if (retsig >= REALTIME_LO && retsig < REALTIME_HI)
622 return retsig;
623 #endif
624
625 *oursig_ok = 0;
626 return 0;
627 }
628 }
629
630 int
gdb_signal_to_host_p(enum gdb_signal oursig)631 gdb_signal_to_host_p (enum gdb_signal oursig)
632 {
633 int oursig_ok;
634 do_gdb_signal_to_host (oursig, &oursig_ok);
635 return oursig_ok;
636 }
637
638 int
gdb_signal_to_host(enum gdb_signal oursig)639 gdb_signal_to_host (enum gdb_signal oursig)
640 {
641 int oursig_ok;
642 int targ_signo = do_gdb_signal_to_host (oursig, &oursig_ok);
643 if (!oursig_ok)
644 {
645 /* The user might be trying to do "signal SIGSAK" where this system
646 doesn't have SIGSAK. */
647 warning (_("Signal %s does not exist on this system."),
648 gdb_signal_to_name (oursig));
649 return 0;
650 }
651 else
652 return targ_signo;
653 }
654