cae36a52 |
1 | #include <u.h> |
2 | #include <libc.h> |
3 | #include <ureg.h> |
4 | #include "dat.h" |
5 | #include "fns.h" |
6 | #include "linux.h" |
7 | |
8 | typedef struct Signal Signal; |
9 | typedef struct Action Action; |
10 | typedef struct Queue Queue; |
11 | typedef struct Timers Timers; |
12 | typedef struct Handlers Handlers; |
13 | typedef struct Private Private; |
14 | |
15 | struct Signal |
16 | { |
17 | Usiginfo; |
18 | Signal *next; |
19 | }; |
20 | |
21 | struct Action |
22 | { |
23 | void *handler; |
24 | int flags; |
25 | uvlong block; |
26 | }; |
27 | |
28 | struct Queue |
29 | { |
30 | Ref; |
31 | QLock; |
32 | |
33 | Signal *head; |
34 | Signal **tailp; |
35 | Signal *free; |
36 | Signal a[64]; |
37 | |
38 | Ufile *tty; |
39 | }; |
40 | |
41 | struct Timers |
42 | { |
43 | Ref; |
44 | struct { |
45 | vlong interval; |
46 | vlong expire; |
47 | } itimer[2]; |
48 | }; |
49 | |
50 | struct Handlers |
51 | { |
52 | Ref; |
53 | QLock; |
54 | Action a[SIGMAX-1]; |
55 | }; |
56 | |
57 | struct Private |
58 | { |
59 | Handlers *h; |
60 | Queue *q; |
61 | Timers *t; |
62 | |
63 | struct { |
64 | ulong sp; |
65 | ulong size; |
66 | } altstack; |
67 | |
68 | uvlong block; |
69 | |
70 | Urestart *freerestart; |
71 | }; |
72 | |
73 | enum |
74 | { |
75 | SIG_ERR = -1, |
76 | SIG_DFL = 0, |
77 | SIG_IGN = 1, |
78 | SIG_HOLD = 2, |
79 | }; |
80 | |
81 | enum |
82 | { |
83 | SA_NOCLDSTOP = 1, |
84 | SA_NOCLDWAIT = 2, |
85 | SA_SIGINFO = 4, |
86 | SA_ONSTACK = 0x08000000, |
87 | SA_RESTART = 0x10000000, |
88 | SA_NODEFER = 0x40000000, |
89 | SA_RESETHAND = 0x80000000, |
90 | }; |
91 | |
92 | enum |
93 | { |
94 | SS_ONSTACK = 1, |
95 | SS_DISABLE = 2, |
96 | }; |
97 | |
98 | #define MASK(sig) (1LL << ((sig)-1)) |
99 | |
100 | static void |
101 | nextsignal(uvlong rblock, int wait); |
102 | |
103 | static int |
104 | getsignal(Private *p, Usiginfo *pinfo, int wait); |
105 | |
106 | static void |
107 | initrestart(Uproc *proc) |
108 | { |
109 | Urestart *r; |
110 | |
111 | r = &proc->restart0; |
112 | r->syscall = nil; |
113 | r->link = nil; |
114 | proc->restart = r; |
115 | } |
116 | |
117 | static void |
118 | poprestart(Private *p) |
119 | { |
120 | Urestart *r; |
121 | |
122 | for(;;){ |
123 | r = current->restart; |
124 | if(r->link==nil || r->syscall) |
125 | break; |
126 | current->restart = r->link; |
127 | |
128 | r->link = p->freerestart; |
129 | p->freerestart = r; |
130 | } |
131 | if(r->syscall) |
132 | current->syscall = r->syscall; |
133 | } |
134 | |
135 | static Queue* |
136 | mkqueue(void) |
137 | { |
138 | Queue *q; |
139 | int i; |
140 | |
141 | q = kmallocz(sizeof(Queue), 1); |
142 | q->ref = 1; |
143 | q->head = nil; |
144 | q->tailp = &q->head; |
145 | for(i=0; i<nelem(q->a); i++) |
146 | q->a[i].next = (i+1 == nelem(q->a)) ? nil : &q->a[i+1]; |
147 | q->free = q->a; |
148 | |
149 | return q; |
150 | } |
151 | |
152 | static Handlers* |
153 | mkhandlers(void) |
154 | { |
155 | Handlers *h; |
156 | int i; |
157 | |
158 | h = kmallocz(sizeof(Handlers), 1); |
159 | h->ref = 1; |
160 | for(i=1; i<SIGMAX; i++) |
161 | h->a[i-1].handler = (void*)SIG_DFL; |
162 | return h; |
163 | } |
164 | |
165 | static Timers* |
166 | mktimers(void) |
167 | { |
168 | Timers *t; |
169 | |
170 | t = kmallocz(sizeof(Timers), 1); |
171 | t->ref = 1; |
172 | return t; |
173 | } |
174 | |
175 | /* bits.s */ |
176 | extern int get_ds(void); |
177 | extern int get_cs(void); |
178 | static ulong user_cs, user_ds; |
179 | |
180 | void initsignal(void) |
181 | { |
182 | Private *p; |
183 | |
184 | if(user_ds==0 && user_cs==0){ |
185 | user_ds = get_ds(); |
186 | user_cs = get_cs(); |
187 | } |
188 | |
189 | p = kmallocz(sizeof(*p), 1); |
190 | p->block = 0; |
191 | |
192 | p->q = mkqueue(); |
193 | p->h = mkhandlers(); |
194 | p->t = mktimers(); |
195 | |
196 | current->signal = p; |
197 | initrestart(current); |
198 | } |
199 | |
200 | void exitsignal(void) |
201 | { |
202 | Private *p; |
203 | Queue *q; |
204 | Timers *t; |
205 | Signal **i; |
206 | Handlers *h; |
207 | Urestart *r; |
208 | |
209 | if((p = current->signal) == nil) |
210 | return; |
211 | current->signal = nil; |
212 | q = p->q; |
213 | qlock(q); |
214 | again: |
215 | for(i=&q->head; *i; i=&((*i)->next)){ |
216 | Signal *r; |
217 | r = *i; |
218 | if(!r->group && (r->topid == current->tid)){ |
219 | if((*i = r->next) == nil) |
220 | q->tailp = i; |
221 | r->next = q->free; |
222 | q->free = r; |
223 | goto again; |
224 | } |
225 | } |
226 | qunlock(q); |
227 | if(!decref(q)){ |
228 | putfile(q->tty); |
229 | q->tty = nil; |
230 | free(q); |
231 | } |
232 | h = p->h; |
233 | if(!decref(h)) |
234 | free(h); |
235 | t = p->t; |
236 | if(!decref(t)) |
237 | free(t); |
238 | while(r = current->restart){ |
239 | if(r->link == nil) |
240 | break; |
241 | current->restart = r->link; |
242 | r->link = p->freerestart; |
243 | p->freerestart = r; |
244 | } |
245 | current->restart = nil; |
246 | while(r = p->freerestart){ |
247 | p->freerestart = r->link; |
248 | free(r); |
249 | } |
250 | free(p); |
251 | } |
252 | |
253 | void clonesignal(Uproc *new, int copyhand, int newproc) |
254 | { |
255 | Private *p, *n; |
256 | |
257 | if((p = current->signal) == nil) |
258 | return; |
259 | |
260 | n = kmallocz(sizeof(*n), 1); |
261 | if(copyhand){ |
262 | n->h = mkhandlers(); |
263 | |
264 | qlock(p->h); |
265 | memmove(n->h->a, p->h->a, sizeof(n->h->a)); |
266 | qunlock(p->h); |
267 | } else { |
268 | incref(p->h); |
269 | n->h = p->h; |
270 | } |
271 | |
272 | qlock(p->q); |
273 | if(newproc){ |
274 | n->q = mkqueue(); |
275 | n->q->tty = getfile(p->q->tty); |
276 | n->t = mktimers(); |
277 | n->altstack = p->altstack; |
278 | } else { |
279 | incref(p->q); |
280 | n->q = p->q; |
281 | incref(p->t); |
282 | n->t = p->t; |
283 | } |
284 | qunlock(p->q); |
285 | |
286 | n->block = p->block; |
287 | new->signal = n; |
288 | |
289 | initrestart(new); |
290 | } |
291 | |
292 | void |
293 | settty(Ufile *tty) |
294 | { |
295 | Private *p; |
296 | Ufile *old; |
297 | |
298 | if((p = current->signal) == nil) |
299 | return; |
300 | tty = getfile(tty); |
301 | qlock(p->q); |
302 | old = p->q->tty; |
303 | p->q->tty = tty; |
304 | qunlock(p->q); |
305 | putfile(old); |
306 | } |
307 | |
308 | Ufile* |
309 | gettty(void) |
310 | { |
311 | Private *p; |
312 | Ufile *tty; |
313 | |
314 | if((p = current->signal) == nil) |
315 | return nil; |
316 | qlock(p->q); |
317 | tty = getfile(p->q->tty); |
318 | qunlock(p->q); |
319 | return tty; |
320 | } |
321 | |
322 | int ignoressignal(Uproc *proc, int sig) |
323 | { |
324 | Private *p; |
325 | int a, f; |
326 | |
327 | if((p = proc->signal) == nil) |
328 | return 1; |
329 | qlock(p->h); |
330 | a = (int)p->h->a[sig-1].handler; |
331 | f = p->h->a[sig-1].flags; |
332 | qunlock(p->h); |
333 | switch(sig){ |
334 | case SIGKILL: |
335 | case SIGSTOP: |
336 | return 0; |
337 | case SIGCHLD: |
338 | if(f & SA_NOCLDWAIT) |
339 | return 1; |
340 | break; |
341 | case SIGWINCH: |
342 | case SIGURG: |
343 | if(a == SIG_DFL) |
344 | return 1; |
345 | } |
346 | return (a == SIG_IGN); |
347 | } |
348 | |
349 | int wantssignal(Uproc *proc, int sig) |
350 | { |
351 | Private *p; |
352 | |
353 | p = proc->signal; |
354 | if(p == nil || p->block & MASK(sig)) |
355 | return 0; |
356 | return !ignoressignal(proc, sig); |
357 | } |
358 | |
359 | int sendsignal(Uproc *proc, Usiginfo *info, int group) |
360 | { |
361 | Private *p; |
362 | Signal *s; |
363 | |
364 | trace("sendsignal(%S) to %d from %d", |
365 | info->signo, proc->tid, (current != nil) ? current->tid : 0); |
366 | |
367 | if(ignoressignal(proc, info->signo)){ |
368 | trace("sendsignal(): ignored signal %S", info->signo); |
369 | return 0; |
370 | } |
371 | |
372 | p = proc->signal; |
373 | qlock(p->q); |
374 | if(info->signo < SIGRT1){ |
375 | for(s=p->q->head; s; s=s->next){ |
376 | if(!s->group && (s->topid != proc->tid)) |
377 | continue; |
378 | if(s->signo == info->signo){ |
379 | qunlock(p->q); |
380 | trace("sendsignal(): droping follow up signal %S", info->signo); |
381 | return 0; |
382 | } |
383 | } |
384 | } |
385 | if((s = p->q->free) == nil){ |
386 | qunlock(p->q); |
387 | trace("sendsignal(): out of signal buffers"); |
388 | return -EAGAIN; |
389 | } |
390 | p->q->free = s->next; |
391 | s->next = nil; |
392 | memmove(s, info, sizeof(*info)); |
393 | s->group = group; |
394 | s->topid = group ? proc->pid : proc->tid; |
395 | *p->q->tailp = s; |
396 | p->q->tailp = &s->next; |
397 | qunlock(p->q); |
398 | return 1; |
399 | } |
400 | |
401 | int |
402 | signalspending(Uproc *proc) |
403 | { |
404 | Private *p; |
405 | Signal *s; |
406 | int ret; |
407 | |
408 | p = proc->signal; |
409 | if(p == nil || p->q->head == nil) |
410 | return 0; |
411 | |
412 | ret = 0; |
413 | qlock(p->q); |
414 | for(s=p->q->head; s; s=s->next){ |
415 | if(!s->group && (s->topid != current->tid)) |
416 | continue; |
417 | if(MASK(s->signo) & p->block) |
418 | continue; |
419 | ret = 1; |
420 | break; |
421 | } |
422 | qunlock(p->q); |
423 | |
424 | return ret; |
425 | } |
426 | |
427 | static int |
428 | getsignal(Private *p, Usiginfo *pinfo, int wait) |
429 | { |
430 | Signal *r; |
431 | Signal **i; |
432 | int sig; |
433 | |
434 | if(!wait && p->q->head == nil) |
435 | return 0; |
436 | |
437 | sig = 0; |
438 | qlock(p->q); |
439 | for(;;){ |
440 | for(i=&p->q->head; *i; i=&((*i)->next)){ |
441 | r = *i; |
442 | |
443 | if(!r->group && (r->topid != current->tid)) |
444 | continue; |
445 | |
446 | if(p->block & MASK(r->signo)){ |
447 | if(sig == 0) |
448 | sig = -r->signo; |
449 | continue; |
450 | } |
451 | sig = r->signo; |
452 | |
453 | /* dequeue nonblocked signal */ |
454 | memmove(pinfo, r, sizeof(*pinfo)); |
455 | if((*i = r->next) == nil) |
456 | p->q->tailp = i; |
457 | r->next = p->q->free; |
458 | p->q->free = r; |
459 | break; |
460 | } |
461 | if(wait && sig <= 0){ |
462 | if(sleepproc(p->q, 0) == 0) |
463 | continue; |
464 | } |
465 | break; |
466 | } |
467 | qunlock(p->q); |
468 | |
469 | return sig; |
470 | } |
471 | |
472 | static uvlong |
473 | sigset2uvlong(uchar *set, int setsize) |
474 | { |
475 | uvlong r; |
476 | int i; |
477 | |
478 | r = 0; |
479 | if(setsize > sizeof(uvlong)) |
480 | setsize = sizeof(uvlong); |
481 | for(i=0; i<setsize; i++) |
482 | r |= (uvlong)set[i] << (i * 8); |
483 | return r; |
484 | } |
485 | |
486 | static void |
487 | uvlong2sigset(uchar *set, int setsize, uvlong mask) |
488 | { |
489 | int i; |
490 | |
491 | for(i=0; i<setsize; i++){ |
492 | if(i < sizeof(uvlong)){ |
493 | set[i] = ((mask >> (i*8)) & 0xff); |
494 | } else { |
495 | set[i] = 0; |
496 | } |
497 | } |
498 | } |
499 | |
500 | struct linux_siginfo { |
501 | int signo; |
502 | int errno; |
503 | int code; |
504 | |
505 | union { |
506 | int _pad[29]; |
507 | |
508 | /* kill() */ |
509 | struct { |
510 | int pid; /* sender's pid */ |
511 | int uid; /* sender's uid */ |
512 | } kill; |
513 | |
514 | /* POSIX.1b timers */ |
515 | struct { |
516 | int tid; /* timer id */ |
517 | int overrun; /* overrun count */ |
518 | int val; /* same as below */ |
519 | } timer; |
520 | |
521 | /* POSIX.1b signals */ |
522 | struct { |
523 | int pid; /* sender's pid */ |
524 | int uid; /* sender's uid */ |
525 | int val; |
526 | } rt; |
527 | |
528 | /* SIGCHLD */ |
529 | struct { |
530 | int pid; /* which child */ |
531 | int uid; /* sender's uid */ |
532 | int status; /* exit code */ |
533 | long utime; |
534 | long stime; |
535 | } chld; |
536 | |
537 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ |
538 | struct { |
539 | void *addr; /* faulting insn/memory ref. */ |
540 | int trapno; /* TRAP # which caused the signal */ |
541 | } fault; |
542 | |
543 | /* SIGPOLL */ |
544 | struct { |
545 | long band; /* POLL_IN, POLL_OUT, POLL_MSG */ |
546 | int fd; |
547 | } poll; |
548 | }; |
549 | }; |
550 | |
551 | void |
552 | siginfo2linux(Usiginfo *info, void *p) |
553 | { |
554 | struct linux_siginfo *li = p; |
555 | int sig; |
556 | |
557 | sig = info->signo; |
558 | |
559 | li->signo = sig; |
560 | li->errno = info->errno; |
561 | li->code = info->code; |
562 | |
563 | switch(sig){ |
564 | case SIGALRM: |
565 | li->timer.tid = info->timer.tid; |
566 | li->timer.overrun = info->timer.overrun; |
567 | li->timer.val = info->timer.val; |
568 | break; |
569 | case SIGCHLD: |
570 | li->chld.pid = info->chld.pid; |
571 | li->chld.uid = info->chld.uid; |
572 | li->chld.status = info->chld.status; |
573 | li->chld.utime = info->chld.utime; |
574 | li->chld.stime = info->chld.stime; |
575 | break; |
576 | case SIGILL: |
577 | case SIGBUS: |
578 | case SIGFPE: |
579 | case SIGSEGV: |
580 | li->fault.addr = info->fault.addr; |
581 | li->fault.trapno = info->fault.trapno; |
582 | break; |
583 | case SIGPOLL: |
584 | li->poll.fd = info->poll.fd; |
585 | li->poll.band = info->poll.band; |
586 | break; |
587 | case SIGRT1: |
588 | case SIGRT2: |
589 | case SIGRT3: |
590 | case SIGRT4: |
591 | case SIGRT5: |
592 | case SIGRT6: |
593 | case SIGRT7: |
594 | case SIGRT8: |
595 | li->rt.pid = info->rt.pid; |
596 | li->rt.uid = info->rt.uid; |
597 | li->rt.val = info->rt.val; |
598 | break; |
599 | default: |
600 | li->kill.pid = info->kill.pid; |
601 | li->kill.uid = info->kill.uid; |
602 | } |
603 | } |
604 | |
605 | void |
606 | linux2siginfo(void *p, Usiginfo *info) |
607 | { |
608 | struct linux_siginfo *li = p; |
609 | int sig; |
610 | |
611 | sig = li->signo; |
612 | |
613 | info->signo = sig; |
614 | info->errno = li->errno; |
615 | info->code = li->code; |
616 | |
617 | switch(sig){ |
618 | case SIGALRM: |
619 | info->timer.tid = li->timer.tid; |
620 | info->timer.overrun = li->timer.overrun; |
621 | info->timer.val = li->timer.val; |
622 | break; |
623 | case SIGCHLD: |
624 | info->chld.pid = li->chld.pid; |
625 | info->chld.uid = li->chld.uid; |
626 | info->chld.status = li->chld.status; |
627 | info->chld.utime = li->chld.utime; |
628 | info->chld.stime = li->chld.stime; |
629 | break; |
630 | case SIGILL: |
631 | case SIGBUS: |
632 | case SIGFPE: |
633 | case SIGSEGV: |
634 | info->fault.addr = li->fault.addr; |
635 | info->fault.trapno = li->fault.trapno; |
636 | break; |
637 | case SIGPOLL: |
638 | info->poll.fd = li->poll.fd; |
639 | info->poll.band = li->poll.band; |
640 | break; |
641 | case SIGRT1: |
642 | case SIGRT2: |
643 | case SIGRT3: |
644 | case SIGRT4: |
645 | case SIGRT5: |
646 | case SIGRT6: |
647 | case SIGRT7: |
648 | case SIGRT8: |
649 | info->rt.pid = li->rt.pid; |
650 | info->rt.uid = li->rt.uid; |
651 | info->rt.val = li->rt.val; |
652 | break; |
653 | default: |
654 | info->kill.pid = li->kill.pid; |
655 | info->kill.uid = li->kill.uid; |
656 | } |
657 | } |
658 | |
659 | struct linux_sigcontext { |
660 | ulong gs; |
661 | ulong fs; |
662 | ulong es; |
663 | ulong ds; |
664 | ulong di; |
665 | ulong si; |
666 | ulong bp; |
667 | ulong sp; |
668 | ulong bx; |
669 | ulong dx; |
670 | ulong cx; |
671 | ulong ax; |
672 | ulong trapno; |
673 | ulong err; |
674 | ulong ip; |
675 | ulong cs; |
676 | ulong flags; |
677 | ulong sp_at_signal; |
678 | ulong ss; |
679 | void* fpstate; |
680 | ulong oldmask; |
681 | ulong cr2; |
682 | }; |
683 | |
684 | static void |
685 | ureg2linuxsigcontext(Ureg *u, struct linux_sigcontext *sc) |
686 | { |
687 | sc->gs = u->gs; |
688 | sc->fs = u->fs; |
689 | sc->es = u->es; |
690 | sc->ds = u->ds; |
691 | sc->di = u->di; |
692 | sc->si = u->si; |
693 | sc->bp = u->bp; |
694 | sc->sp = u->sp; |
695 | sc->bx = u->bx; |
696 | sc->dx = u->dx; |
697 | sc->cx = u->cx; |
698 | sc->ax = u->ax; |
699 | sc->trapno = u->trap; |
700 | sc->err = u->ecode; |
701 | sc->ip = u->pc; |
702 | sc->cs = u->cs; |
703 | sc->flags = u->flags; |
704 | sc->sp_at_signal = u->sp; |
705 | sc->ss = u->ss; |
706 | sc->cr2 = 0; |
707 | } |
708 | |
709 | struct linux_sigset { |
710 | ulong sig[2]; |
711 | }; |
712 | |
713 | struct linux_signalstack { |
714 | ulong sp; |
715 | int flags; |
716 | ulong size; |
717 | }; |
718 | |
719 | struct linux_ucontext { |
720 | ulong flags; |
721 | struct linux_ucontext *link; |
722 | struct linux_signalstack stack; |
723 | struct linux_sigcontext context; |
724 | struct linux_sigset sigmask; |
725 | }; |
726 | |
727 | static void |
728 | linuxsigcontext2ureg(struct linux_sigcontext *sc, Ureg *u) |
729 | { |
730 | u->pc = sc->ip; |
731 | u->sp = sc->sp; |
732 | u->ax = sc->ax; |
733 | u->bx = sc->bx; |
734 | u->cx = sc->cx; |
735 | u->dx = sc->dx; |
736 | u->di = sc->di; |
737 | u->si = sc->si; |
738 | u->bp = sc->bp; |
739 | |
740 | u->cs = sc->cs; |
741 | u->ss = sc->ss; |
742 | u->ds = sc->ds; |
743 | u->es = sc->es; |
744 | u->fs = sc->fs; |
745 | u->gs = sc->gs; |
746 | } |
747 | |
748 | struct linux_sigframe { |
749 | void *ret; |
750 | int sig; |
751 | |
752 | union { |
753 | struct linux_sigcontext sc; |
754 | |
755 | struct { |
756 | struct linux_siginfo *pinfo; |
757 | struct linux_ucontext *puc; |
758 | |
759 | struct linux_siginfo info; |
760 | struct linux_ucontext uc; |
761 | } rt; |
762 | }; |
763 | }; |
764 | |
765 | #pragma profile off |
766 | |
767 | static int |
768 | linuxstackflags(Private *p, ulong sp) |
769 | { |
770 | if(p->altstack.size == 0 || p->altstack.sp == 0) |
771 | return SS_DISABLE; |
772 | if(sp - p->altstack.sp < p->altstack.size) |
773 | return SS_ONSTACK; |
774 | return 0; |
775 | } |
776 | |
777 | static void |
778 | linuxsignal(Private *p, Action *a, Usiginfo *i, uvlong rblock) |
779 | { |
780 | struct linux_sigframe _frame; |
781 | struct linux_sigframe *f; |
782 | Ureg *u; |
783 | int stackflags; |
784 | |
785 | u = current->ureg; |
786 | |
787 | stackflags = linuxstackflags(p, u->sp); |
788 | if((a->flags & SA_ONSTACK) && (stackflags == 0)){ |
789 | trace("linuxsignal: altstack %lux %lux", p->altstack.sp, p->altstack.size); |
790 | f = (struct linux_sigframe*)(p->altstack.sp + p->altstack.size); |
791 | f--; |
792 | } else { |
793 | f = &_frame; |
794 | } |
795 | |
796 | trace("linuxsignal(): frame %p", f); |
797 | memset(f, 0, sizeof(*f)); |
798 | |
799 | f->sig = i->signo; |
800 | |
801 | if(a->flags & SA_SIGINFO){ |
802 | f->ret = linux_rtsigreturn; |
803 | siginfo2linux(i, &f->rt.info); |
804 | f->rt.pinfo = &f->rt.info; |
805 | |
806 | f->rt.uc.stack.sp = p->altstack.sp; |
807 | f->rt.uc.stack.size = p->altstack.size; |
808 | f->rt.uc.stack.flags = stackflags; |
809 | |
810 | ureg2linuxsigcontext(u, &f->rt.uc.context); |
811 | f->rt.uc.context.oldmask = rblock & 0xFFFFFFFF; |
812 | f->rt.uc.sigmask.sig[0] = rblock & 0xFFFFFFFF; |
813 | f->rt.uc.sigmask.sig[1] = (rblock >> 32) & 0xFFFFFFFF; |
814 | f->rt.puc = &f->rt.uc; |
815 | u->cx = (ulong)f->rt.puc; |
816 | u->dx = (ulong)f->rt.pinfo; |
817 | } else { |
818 | f->ret = linux_sigreturn; |
819 | ureg2linuxsigcontext(u, &f->sc); |
820 | f->sc.oldmask = rblock & 0xFFFFFFFF; |
821 | u->cx = 0; |
822 | u->dx = 0; |
823 | } |
824 | |
825 | u->di = 0; |
826 | u->si = 0; |
827 | u->bp = 0; |
828 | u->bx = 0; |
829 | |
830 | u->ax = (ulong)i->signo; |
831 | |
832 | u->sp = (ulong)f; |
833 | u->pc = (ulong)a->handler; |
834 | |
835 | u->cs = user_cs; |
836 | u->ss = user_ds; |
837 | u->ds = user_ds; |
838 | u->es = user_ds; |
839 | |
840 | p->block |= a->block; |
841 | |
842 | trace("linuxsignal(): retuser pc=%lux sp=%lux", u->pc, u->sp); |
843 | retuser(); |
844 | } |
845 | |
846 | int |
847 | sys_sigreturn(void) |
848 | { |
849 | struct linux_sigframe *f; |
850 | Private *p; |
851 | Ureg *u; |
852 | |
853 | trace("sys_sigreturn()"); |
854 | |
855 | p = current->signal; |
856 | u = current->ureg; |
857 | |
858 | f = (struct linux_sigframe*)(u->sp - 4); |
859 | |
860 | trace("sys_sigreturn(): frame %p", f); |
861 | |
862 | linuxsigcontext2ureg(&f->sc, u); |
863 | p->block &= ~0xFFFFFFFF; |
864 | p->block |= f->sc.oldmask; |
865 | nextsignal(p->block, 0); |
866 | poprestart(p); |
867 | |
868 | trace("sys_sigreturn(): retuser pc=%lux sp=%lux", u->pc, u->sp); |
869 | retuser(); |
870 | |
871 | return -1; |
872 | } |
873 | |
874 | int |
875 | sys_rt_sigreturn(void) |
876 | { |
877 | struct linux_sigframe *f; |
878 | Private *p; |
879 | Ureg *u; |
880 | |
881 | trace("sys_rt_sigreturn()"); |
882 | |
883 | p = current->signal; |
884 | u = current->ureg; |
885 | |
886 | f = (struct linux_sigframe*)(u->sp - 4); |
887 | trace("sys_rt_sigreturn(): frame %p", f); |
888 | |
889 | linuxsigcontext2ureg(&f->rt.uc.context, u); |
890 | p->block = (uvlong)f->rt.uc.sigmask.sig[0] | (uvlong)f->rt.uc.sigmask.sig[1]<<32; |
891 | nextsignal(p->block, 0); |
892 | poprestart(p); |
893 | |
894 | trace("sys_rt_sigreturn(): pc=%lux sp=%lux", u->pc, u->sp); |
895 | retuser(); |
896 | |
897 | return -1; |
898 | } |
899 | |
900 | /* |
901 | * nextsignal transfers execution to the next pending |
902 | * signal or just returns. after the signal got executed, |
903 | * the block mask is restored to rblock. if heres no |
904 | * pending signal and wait is non zero the current |
905 | * process is suspended until here is a signal available. |
906 | */ |
907 | |
908 | static void |
909 | nextsignal(uvlong rblock, int wait) |
910 | { |
911 | Private *p; |
912 | int sig; |
913 | Usiginfo info; |
914 | Action a; |
915 | Urestart *r; |
916 | |
917 | for(;;){ |
918 | if((p = current->signal) == nil) |
919 | return; |
920 | |
921 | if(current->wstate & WSTOPPED){ |
922 | p->block = ~(MASK(SIGCONT) | MASK(SIGKILL)); |
923 | sig = getsignal(p, &info, 1); |
924 | p->block = rblock; |
925 | if(sig <= 0) |
926 | return; |
927 | if(sig == SIGCONT){ |
928 | contproc(current, sig, info.group); |
929 | continue; |
930 | } |
931 | } else { |
932 | if((sig = getsignal(p, &info, wait)) <= 0) |
933 | return; |
934 | if(sig == SIGCONT) |
935 | continue; |
936 | if(sig == SIGSTOP){ |
937 | stopproc(current, sig, info.group); |
938 | continue; |
939 | } |
940 | } |
941 | break; |
942 | } |
943 | |
944 | trace("nextsignal(): signal %S", sig); |
945 | |
946 | qlock(p->h); |
947 | a = p->h->a[sig-1]; |
948 | if(a.flags & SA_RESETHAND) |
949 | p->h->a[sig-1].handler = (void*)SIG_DFL; |
950 | if(a.flags & SA_NODEFER == 0) |
951 | a.block |= MASK(sig); |
952 | qunlock(p->h); |
953 | |
954 | switch((int)a.handler){ |
955 | case SIG_DFL: |
956 | switch(sig){ |
957 | case SIGCHLD: |
958 | case SIGWINCH: |
959 | case SIGURG: |
960 | goto Ignored; |
961 | } |
962 | /* no break */ |
963 | case SIG_ERR: |
964 | trace("nextsignal(): signal %S causes exit", sig); |
965 | exitproc(current, sig, 1); |
966 | Ignored: |
967 | case SIG_IGN: |
968 | case SIG_HOLD: |
969 | trace("nextsignal(): signal %S ignored", sig); |
970 | return; |
971 | } |
972 | |
973 | if(current->restart->syscall){ |
974 | if(a.flags & SA_RESTART){ |
975 | if(r = p->freerestart) |
976 | p->freerestart = r->link; |
977 | if(r == nil) |
978 | r = kmalloc(sizeof(*r)); |
979 | r->syscall = nil; |
980 | r->link = current->restart; |
981 | current->restart = r; |
982 | } else { |
983 | trace("nextsignal(): interrupting syscall %s", current->syscall); |
984 | current->sysret(-EINTR); |
985 | } |
986 | } |
987 | |
988 | linuxsignal(p, &a, &info, rblock); |
989 | } |
990 | |
991 | void handlesignals(void) |
992 | { |
993 | Private *p; |
994 | |
995 | if(p = current->signal) |
996 | nextsignal(p->block, 0); |
997 | } |
998 | |
999 | int |
1000 | sys_rt_sigsuspend(uchar *set, int setsize) |
1001 | { |
1002 | Private *p; |
1003 | uvlong b, rblock; |
1004 | |
1005 | trace("sys_rt_sigsuspend(%p, %d)", set, setsize); |
1006 | |
1007 | p = current->signal; |
1008 | b = sigset2uvlong(set, setsize); |
1009 | b &= ~(MASK(SIGKILL) | MASK(SIGSTOP)); |
1010 | |
1011 | rblock = p->block; |
1012 | p->block = b; |
1013 | |
1014 | /* |
1015 | * if a signal got handled, it will pop out after the the |
1016 | * sigsuspend syscall with return value set to -EINTR |
1017 | */ |
1018 | current->sysret(-EINTR); |
1019 | |
1020 | for(;;) |
1021 | nextsignal(rblock, 1); |
1022 | } |
1023 | |
1024 | #pragma profile on |
1025 | |
1026 | struct linux_altstack |
1027 | { |
1028 | ulong sp; |
1029 | int flags; |
1030 | ulong size; |
1031 | }; |
1032 | |
1033 | int sys_sigaltstack(void *stk, void *ostk) |
1034 | { |
1035 | Private *p; |
1036 | struct linux_altstack *a = stk, *oa = ostk; |
1037 | int flags; |
1038 | ulong sp, size; |
1039 | |
1040 | trace("sys_sigaltstack(%lux, %lux)", (ulong)stk, (ulong)ostk); |
1041 | |
1042 | p = current->signal; |
1043 | sp = p->altstack.sp; |
1044 | size = p->altstack.size; |
1045 | flags = linuxstackflags(p, current->ureg->sp); |
1046 | |
1047 | if(a){ |
1048 | if(flags == SS_ONSTACK) |
1049 | return -EPERM; |
1050 | |
1051 | if(a->flags == SS_DISABLE){ |
1052 | p->altstack.sp = 0; |
1053 | p->altstack.size = 0; |
1054 | } else { |
1055 | p->altstack.sp = a->sp; |
1056 | p->altstack.size = a->size; |
1057 | } |
1058 | |
1059 | trace("sys_signalstack(): new altstack %lux-%lux", |
1060 | p->altstack.sp, p->altstack.sp + p->altstack.size); |
1061 | } |
1062 | if(oa){ |
1063 | oa->sp = sp; |
1064 | oa->size = size; |
1065 | oa->flags = flags; |
1066 | } |
1067 | |
1068 | return 0; |
1069 | } |
1070 | |
1071 | struct linux_sigaction |
1072 | { |
1073 | void *handler; |
1074 | ulong flags; |
1075 | void *restorer; |
1076 | uchar mask[]; |
1077 | }; |
1078 | |
1079 | int sys_rt_sigaction(int sig, void *pact, void *poact, int setsize) |
1080 | { |
1081 | Private *p; |
1082 | Action *a; |
1083 | struct linux_sigaction *act; |
1084 | struct linux_sigaction *oact; |
1085 | void *handler; |
1086 | int flags; |
1087 | uvlong block; |
1088 | |
1089 | trace("sys_rt_sigaction(%S, %p, %p, %d)", sig, pact, poact, setsize); |
1090 | |
1091 | p = current->signal; |
1092 | act = (struct linux_sigaction*)pact; |
1093 | oact = (struct linux_sigaction*)poact; |
1094 | |
1095 | if((sig < 1) || (sig >= SIGMAX)) |
1096 | return -EINVAL; |
1097 | |
1098 | qlock(p->h); |
1099 | a = &p->h->a[sig-1]; |
1100 | handler = a->handler; |
1101 | flags = a->flags; |
1102 | block = a->block; |
1103 | if(act){ |
1104 | trace("flags = %x", a->flags); |
1105 | a->handler = act->handler; |
1106 | a->flags = act->flags; |
1107 | a->block = sigset2uvlong(act->mask, setsize); |
1108 | } |
1109 | if(oact){ |
1110 | oact->handler = handler; |
1111 | oact->flags = flags; |
1112 | oact->restorer = 0; |
1113 | uvlong2sigset(oact->mask, setsize, block); |
1114 | } |
1115 | qunlock(p->h); |
1116 | |
1117 | return 0; |
1118 | } |
1119 | |
1120 | int sys_rt_sigpending(uchar *set, int setsize) |
1121 | { |
1122 | Private *p; |
1123 | Signal *s; |
1124 | uvlong m; |
1125 | |
1126 | trace("sys_rt_sigpending(%p, %d)", set, setsize); |
1127 | |
1128 | p = current->signal; |
1129 | m = 0LL; |
1130 | qlock(p->q); |
1131 | for(s=p->q->head; s; s=s->next){ |
1132 | if(!s->group && (s->topid != current->tid)) |
1133 | continue; |
1134 | m |= MASK(s->signo); |
1135 | } |
1136 | qunlock(p->q); |
1137 | |
1138 | uvlong2sigset(set, setsize, m); |
1139 | return 0; |
1140 | } |
1141 | |
1142 | enum |
1143 | { |
1144 | SIG_BLOCK = 0, |
1145 | SIG_UNBLOCK = 1, |
1146 | SIG_SETMASK = 2, |
1147 | }; |
1148 | |
1149 | int sys_rt_sigprocmask(int how, uchar *act, uchar *oact, int setsize) |
1150 | { |
1151 | Private *p; |
1152 | uvlong m, block; |
1153 | |
1154 | trace("sys_rt_sigprocmask(%d, %p, %p, %d)", how, act, oact, setsize); |
1155 | |
1156 | p = current->signal; |
1157 | block = p->block; |
1158 | if(act){ |
1159 | m = sigset2uvlong(act, setsize); |
1160 | m &= ~(MASK(SIGKILL) | MASK(SIGSTOP)); |
1161 | switch(how){ |
1162 | default: |
1163 | return -EINVAL; |
1164 | case SIG_BLOCK: |
1165 | p->block |= m; |
1166 | break; |
1167 | case SIG_UNBLOCK: |
1168 | p->block &= ~m; |
1169 | break; |
1170 | case SIG_SETMASK: |
1171 | p->block = m; |
1172 | break; |
1173 | } |
1174 | } |
1175 | if(oact) |
1176 | uvlong2sigset(oact, setsize, block); |
1177 | return 0; |
1178 | } |
1179 | |
1180 | struct linux_itimer |
1181 | { |
1182 | struct linux_timeval it_interval; |
1183 | struct linux_timeval it_value; |
1184 | }; |
1185 | |
1186 | static vlong |
1187 | hzround(vlong t) |
1188 | { |
1189 | vlong q = 1000000000LL/HZ; |
1190 | return (t + q-1) / q; |
1191 | } |
1192 | |
1193 | int sys_setitimer(int which, void *value, void *ovalue) |
1194 | { |
1195 | Private *p; |
1196 | Timers *t; |
1197 | vlong now, rem, delta; |
1198 | struct linux_itimer *nv = value, *ov = ovalue; |
1199 | |
1200 | trace("sys_setitimer(%d, %p, %p)", which, value, ovalue); |
1201 | |
1202 | p = current->signal; |
1203 | t = p->t; |
1204 | |
1205 | if(which < 0 || which >= nelem(t->itimer)) |
1206 | return -EINVAL; |
1207 | |
1208 | now = nsec(); |
1209 | delta = t->itimer[which].interval; |
1210 | rem = t->itimer[which].expire - now; |
1211 | if(rem < 0) |
1212 | rem = 0; |
1213 | if(nv != nil){ |
1214 | trace("nv->{interval->{%ld, %ld}, value->{%ld, %ld}}", |
1215 | nv->it_interval.tv_sec, nv->it_interval.tv_usec, |
1216 | nv->it_value.tv_sec, nv->it_value.tv_usec); |
1217 | t->itimer[which].interval = hzround(nv->it_interval.tv_sec*1000000000LL + |
1218 | nv->it_interval.tv_usec*1000); |
1219 | t->itimer[which].expire = (now + nv->it_value.tv_sec*1000000000LL + |
1220 | nv->it_value.tv_usec*1000); |
1221 | setalarm(t->itimer[which].expire); |
1222 | } |
1223 | |
1224 | if(ov != nil){ |
1225 | ov->it_interval.tv_sec = delta / 1000000000LL; |
1226 | ov->it_interval.tv_usec = (delta % 1000000000LL)/1000; |
1227 | ov->it_value.tv_sec = rem / 1000000000LL; |
1228 | ov->it_value.tv_usec = (rem % 1000000000LL)/1000; |
1229 | trace("ov->{interval->{%ld, %ld}, value->{%ld, %ld}}", |
1230 | ov->it_interval.tv_sec, ov->it_interval.tv_usec, |
1231 | ov->it_value.tv_sec, ov->it_value.tv_usec); |
1232 | } |
1233 | |
1234 | return 0; |
1235 | } |
1236 | |
1237 | int sys_getitimer(int which, void *value) |
1238 | { |
1239 | Private *p; |
1240 | Timers *t; |
1241 | vlong rem, delta; |
1242 | struct linux_itimer *v = value; |
1243 | |
1244 | trace("sys_getitimer(%d, %p)", which, value); |
1245 | |
1246 | p = current->signal; |
1247 | t = p->t; |
1248 | |
1249 | if(value == nil) |
1250 | return -EINVAL; |
1251 | if(which < 0 || which >= nelem(t->itimer)) |
1252 | return -EINVAL; |
1253 | |
1254 | delta =t->itimer[which].interval; |
1255 | rem = t->itimer[which].expire - nsec(); |
1256 | |
1257 | if(rem < 0) |
1258 | rem = 0; |
1259 | v->it_interval.tv_sec = delta / 1000000000LL; |
1260 | v->it_interval.tv_usec = (delta % 1000000000LL)/1000; |
1261 | v->it_value.tv_sec = rem / 1000000000LL; |
1262 | v->it_value.tv_usec = (rem % 1000000000LL)/1000; |
1263 | |
1264 | return 0; |
1265 | } |
1266 | |
1267 | int sys_alarm(long seconds) |
1268 | { |
1269 | Private *p; |
1270 | Timers *t; |
1271 | vlong old, now; |
1272 | |
1273 | trace("sys_alarm(%ld)", seconds); |
1274 | p = current->signal; |
1275 | t = p->t; |
1276 | now = nsec(); |
1277 | old = t->itimer[0].expire - now; |
1278 | if(old < 0) |
1279 | old = 0; |
1280 | t->itimer[0].interval = 0; |
1281 | if(seconds > 0){ |
1282 | t->itimer[0].expire = now + (vlong)seconds * 1000000000LL; |
1283 | setalarm(t->itimer[0].expire); |
1284 | } else { |
1285 | t->itimer[0].expire = 0; |
1286 | } |
1287 | return old / 1000000000LL; |
1288 | } |
1289 | |
1290 | int |
1291 | Sfmt(Fmt *f) |
1292 | { |
1293 | static char *t[] = { |
1294 | [SIGHUP] = "SIGHUP", |
1295 | [SIGINT] = "SIGINT", |
1296 | [SIGQUIT] = "SIGQUIT", |
1297 | [SIGILL] = "SIGILL", |
1298 | [SIGTRAP] = "SIGTRAP", |
1299 | [SIGABRT] = "SIGABRT", |
1300 | [SIGBUS] = "SIGBUS", |
1301 | [SIGFPE] = "SIGFPE", |
1302 | [SIGKILL] = "SIGKILL", |
1303 | [SIGUSR1] = "SIGUSR1", |
1304 | [SIGSEGV] = "SIGSEGV", |
1305 | [SIGUSR2] = "SIGUSR2", |
1306 | [SIGPIPE] = "SIGPIPE", |
1307 | [SIGALRM] = "SIGALRM", |
1308 | [SIGTERM] = "SIGTERM", |
1309 | [SIGSTKFLT] = "SIGSTKFLT", |
1310 | [SIGCHLD] = "SIGCHLD", |
1311 | [SIGCONT] = "SIGCONT", |
1312 | [SIGSTOP] = "SIGSTOP", |
1313 | [SIGTSTP] = "SIGTSTP", |
1314 | [SIGTTIN] = "SIGTTIN", |
1315 | [SIGTTOU] = "SIGTTOU", |
1316 | [SIGURG] = "SIGURG", |
1317 | [SIGXCPU] = "SIGXCPU", |
1318 | [SIGXFSZ] = "SIGXFSZ", |
1319 | [SIGVTALRM] = "SIGVTALRM", |
1320 | [SIGPROF] = "SIGPROF", |
1321 | [SIGWINCH] = "SIGWINCH", |
1322 | [SIGIO] = "SIGIO", |
1323 | [SIGPWR] = "SIGPWR", |
1324 | [SIGSYS] = "SIGSYS", |
1325 | [SIGRT1] = "SIGRT1", |
1326 | [SIGRT2] = "SIGRT2", |
1327 | [SIGRT3] = "SIGRT3", |
1328 | [SIGRT4] = "SIGRT4", |
1329 | [SIGRT5] = "SIGRT5", |
1330 | [SIGRT6] = "SIGRT6", |
1331 | [SIGRT7] = "SIGRT7", |
1332 | [SIGRT8] = "SIGRT8", |
1333 | }; |
1334 | |
1335 | int sig; |
1336 | |
1337 | sig = va_arg(f->args, int); |
1338 | if(sig < 1 || sig >= SIGMAX) |
1339 | return fmtprint(f, "%d", sig); |
1340 | return fmtprint(f, "%d [%s]", sig, t[sig]); |
1341 | } |
1342 | |
1343 | /* proc.c */ |
1344 | extern int procsetalarm(Uproc *proc, vlong t); |
1345 | |
1346 | void |
1347 | alarmtimer(Uproc *proc, vlong now) |
1348 | { |
1349 | Private *p; |
1350 | Timers *t; |
1351 | vlong expire, delta; |
1352 | Usiginfo si; |
1353 | int i, overrun; |
1354 | |
1355 | if((p = proc->signal) == nil) |
1356 | return; |
1357 | t = p->t; |
1358 | for(i=0; i < nelem(t->itimer); i++){ |
1359 | expire = t->itimer[i].expire; |
1360 | if(expire <= 0) |
1361 | continue; |
1362 | if(now < expire){ |
1363 | procsetalarm(proc, expire); |
1364 | continue; |
1365 | } |
1366 | overrun = 0; |
1367 | delta = (t->itimer[i].interval); |
1368 | if(delta > 0){ |
1369 | expire += delta; |
1370 | while(expire <= now){ |
1371 | expire += delta; |
1372 | overrun++; |
1373 | } |
1374 | procsetalarm(proc, expire); |
1375 | } else { |
1376 | expire = 0; |
1377 | } |
1378 | t->itimer[i].expire = expire; |
1379 | |
1380 | memset(&si, 0, sizeof(si)); |
1381 | si.signo = SIGALRM; |
1382 | si.code = SI_TIMER; |
1383 | si.timer.tid = i; |
1384 | si.timer.overrun = overrun; |
1385 | killproc(proc, &si, 1); |
1386 | } |
1387 | } |