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Commit | Line | Data |
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31e31b8a | 1 | /* |
66fb9763 | 2 | * Emulation of Linux signals |
31e31b8a FB |
3 | * |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | #include <stdlib.h> | |
21 | #include <stdio.h> | |
66fb9763 | 22 | #include <string.h> |
31e31b8a FB |
23 | #include <stdarg.h> |
24 | #include <signal.h> | |
66fb9763 | 25 | #include <errno.h> |
31e31b8a FB |
26 | #include <sys/ucontext.h> |
27 | ||
66fb9763 FB |
28 | #include "gemu.h" |
29 | ||
30 | #include "syscall_defs.h" | |
31 | ||
32 | #ifdef TARGET_I386 | |
33 | #include "cpu-i386.h" | |
34 | #include "syscall-i386.h" | |
35 | #endif | |
36 | ||
37 | /* signal handling inspired from em86. */ | |
38 | ||
39 | //#define DEBUG_SIGNAL | |
40 | ||
41 | #define MAX_SIGQUEUE_SIZE 1024 | |
42 | ||
43 | struct sigqueue { | |
44 | struct sigqueue *next; | |
45 | siginfo_t info; | |
46 | }; | |
31e31b8a FB |
47 | |
48 | struct emulated_sigaction { | |
49 | struct target_sigaction sa; | |
66fb9763 FB |
50 | int pending; /* true if signal is pending */ |
51 | struct sigqueue *first; | |
52 | struct sigqueue info; /* in order to always have memory for the | |
53 | first signal, we put it here */ | |
31e31b8a FB |
54 | }; |
55 | ||
66fb9763 FB |
56 | static struct emulated_sigaction sigact_table[TARGET_NSIG]; |
57 | static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */ | |
58 | static struct sigqueue *first_free; /* first free siginfo queue entry */ | |
59 | static int signal_pending; /* non zero if a signal may be pending */ | |
31e31b8a | 60 | |
66fb9763 FB |
61 | static void host_signal_handler(int host_signum, siginfo_t *info, |
62 | void *puc); | |
63 | ||
64 | /* XXX: do it properly */ | |
31e31b8a FB |
65 | static inline int host_to_target_signal(int sig) |
66 | { | |
67 | return sig; | |
68 | } | |
69 | ||
70 | static inline int target_to_host_signal(int sig) | |
71 | { | |
72 | return sig; | |
73 | } | |
74 | ||
66fb9763 FB |
75 | void host_to_target_sigset(target_sigset_t *d, sigset_t *s) |
76 | { | |
77 | int i; | |
78 | for(i = 0;i < TARGET_NSIG_WORDS; i++) { | |
79 | d->sig[i] = tswapl(((unsigned long *)s)[i]); | |
80 | } | |
81 | } | |
82 | ||
83 | void target_to_host_sigset(sigset_t *d, target_sigset_t *s) | |
84 | { | |
85 | int i; | |
86 | for(i = 0;i < TARGET_NSIG_WORDS; i++) { | |
87 | ((unsigned long *)d)[i] = tswapl(s->sig[i]); | |
88 | } | |
89 | } | |
90 | ||
91 | void host_to_target_old_sigset(target_ulong *old_sigset, | |
92 | const sigset_t *sigset) | |
93 | { | |
94 | *old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff); | |
95 | } | |
96 | ||
97 | void target_to_host_old_sigset(sigset_t *sigset, | |
98 | const target_ulong *old_sigset) | |
99 | { | |
100 | sigemptyset(sigset); | |
101 | *(unsigned long *)sigset = tswapl(*old_sigset); | |
102 | } | |
103 | ||
104 | /* XXX: finish it */ | |
105 | void host_to_target_siginfo(target_siginfo_t *tinfo, siginfo_t *info) | |
106 | { | |
107 | tinfo->si_signo = tswap32(info->si_signo); | |
108 | tinfo->si_errno = tswap32(info->si_errno); | |
109 | tinfo->si_code = tswap32(info->si_code); | |
110 | } | |
111 | ||
112 | /* XXX: finish it */ | |
113 | void target_to_host_siginfo(siginfo_t *info, target_siginfo_t *tinfo) | |
114 | { | |
115 | info->si_signo = tswap32(tinfo->si_signo); | |
116 | info->si_errno = tswap32(tinfo->si_errno); | |
117 | info->si_code = tswap32(tinfo->si_code); | |
118 | } | |
119 | ||
31e31b8a FB |
120 | void signal_init(void) |
121 | { | |
122 | struct sigaction act; | |
123 | int i; | |
124 | ||
125 | /* set all host signal handlers */ | |
126 | sigemptyset(&act.sa_mask); | |
127 | act.sa_flags = SA_SIGINFO; | |
128 | act.sa_sigaction = host_signal_handler; | |
129 | for(i = 1; i < NSIG; i++) { | |
66fb9763 | 130 | sigaction(i, &act, NULL); |
31e31b8a FB |
131 | } |
132 | ||
133 | memset(sigact_table, 0, sizeof(sigact_table)); | |
66fb9763 FB |
134 | |
135 | first_free = &sigqueue_table[0]; | |
136 | for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) | |
137 | sigqueue_table[i].next = &sigqueue_table[i + 1]; | |
138 | sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL; | |
139 | } | |
140 | ||
141 | /* signal queue handling */ | |
142 | ||
143 | static inline struct sigqueue *alloc_sigqueue(void) | |
144 | { | |
145 | struct sigqueue *q = first_free; | |
146 | if (!q) | |
147 | return NULL; | |
148 | first_free = q->next; | |
149 | return q; | |
31e31b8a FB |
150 | } |
151 | ||
66fb9763 FB |
152 | static inline void free_sigqueue(struct sigqueue *q) |
153 | { | |
154 | q->next = first_free; | |
155 | first_free = q; | |
156 | } | |
157 | ||
158 | static int queue_signal(struct emulated_sigaction *k, int sig, siginfo_t *info) | |
159 | { | |
160 | struct sigqueue *q, **pq; | |
161 | ||
162 | pq = &k->first; | |
163 | if (!k->pending || sig < TARGET_SIGRTMIN) { | |
164 | /* first signal or non real time signal */ | |
165 | q = &k->info; | |
166 | } else { | |
167 | q = alloc_sigqueue(); | |
168 | if (!q) | |
169 | return -EAGAIN; | |
170 | while (*pq != NULL) | |
171 | pq = &(*pq)->next; | |
172 | } | |
173 | *pq = q; | |
174 | q->info = *info; | |
175 | q->next = NULL; | |
176 | k->pending = 1; | |
177 | /* signal that a new signal is pending */ | |
178 | signal_pending = 1; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | void force_sig(int sig) | |
183 | { | |
184 | int host_sig; | |
185 | /* abort execution with signal */ | |
186 | host_sig = target_to_host_signal(sig); | |
187 | fprintf(stderr, "gemu: uncaught target signal %d (%s) - exiting\n", | |
188 | sig, strsignal(host_sig)); | |
189 | _exit(-host_sig); | |
190 | } | |
191 | ||
192 | ||
31e31b8a FB |
193 | static void host_signal_handler(int host_signum, siginfo_t *info, |
194 | void *puc) | |
195 | { | |
66fb9763 FB |
196 | struct emulated_sigaction *k; |
197 | int sig; | |
198 | target_ulong handler; | |
199 | ||
31e31b8a | 200 | /* get target signal number */ |
66fb9763 FB |
201 | sig = host_to_target_signal(host_signum); |
202 | if (sig < 1 || sig > TARGET_NSIG) | |
31e31b8a | 203 | return; |
66fb9763 FB |
204 | k = &sigact_table[sig - 1]; |
205 | #ifdef DEBUG_SIGNAL | |
206 | fprintf(stderr, "gemu: got signal %d\n", sig); | |
207 | #endif | |
208 | handler = k->sa._sa_handler; | |
209 | if (handler == TARGET_SIG_DFL) { | |
210 | /* default handler : ignore some signal. The other are fatal */ | |
211 | if (sig != TARGET_SIGCHLD && | |
212 | sig != TARGET_SIGURG && | |
213 | sig != TARGET_SIGWINCH) { | |
214 | force_sig(sig); | |
215 | } | |
216 | } else if (handler == TARGET_SIG_IGN) { | |
217 | /* ignore signal */ | |
218 | } else if (handler == TARGET_SIG_ERR) { | |
219 | force_sig(sig); | |
220 | } else { | |
221 | queue_signal(k, sig, info); | |
222 | } | |
223 | } | |
224 | ||
225 | int do_sigaction(int sig, const struct target_sigaction *act, | |
226 | struct target_sigaction *oact) | |
227 | { | |
228 | struct emulated_sigaction *k; | |
229 | ||
230 | if (sig < 1 || sig > TARGET_NSIG) | |
231 | return -EINVAL; | |
232 | k = &sigact_table[sig - 1]; | |
233 | #if defined(DEBUG_SIGNAL) && 0 | |
234 | fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n", | |
235 | sig, (int)act, (int)oact); | |
236 | #endif | |
237 | if (oact) { | |
238 | oact->_sa_handler = tswapl(k->sa._sa_handler); | |
239 | oact->sa_flags = tswapl(k->sa.sa_flags); | |
240 | oact->sa_restorer = tswapl(k->sa.sa_restorer); | |
241 | oact->sa_mask = k->sa.sa_mask; | |
242 | } | |
243 | if (act) { | |
244 | k->sa._sa_handler = tswapl(act->_sa_handler); | |
245 | k->sa.sa_flags = tswapl(act->sa_flags); | |
246 | k->sa.sa_restorer = tswapl(act->sa_restorer); | |
247 | k->sa.sa_mask = act->sa_mask; | |
248 | } | |
249 | return 0; | |
250 | } | |
251 | ||
252 | #ifdef TARGET_I386 | |
253 | ||
254 | /* from the Linux kernel */ | |
255 | ||
256 | struct target_fpreg { | |
257 | uint16_t significand[4]; | |
258 | uint16_t exponent; | |
259 | }; | |
260 | ||
261 | struct target_fpxreg { | |
262 | uint16_t significand[4]; | |
263 | uint16_t exponent; | |
264 | uint16_t padding[3]; | |
265 | }; | |
266 | ||
267 | struct target_xmmreg { | |
268 | target_ulong element[4]; | |
269 | }; | |
270 | ||
271 | struct target_fpstate { | |
272 | /* Regular FPU environment */ | |
273 | target_ulong cw; | |
274 | target_ulong sw; | |
275 | target_ulong tag; | |
276 | target_ulong ipoff; | |
277 | target_ulong cssel; | |
278 | target_ulong dataoff; | |
279 | target_ulong datasel; | |
280 | struct target_fpreg _st[8]; | |
281 | uint16_t status; | |
282 | uint16_t magic; /* 0xffff = regular FPU data only */ | |
283 | ||
284 | /* FXSR FPU environment */ | |
285 | target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ | |
286 | target_ulong mxcsr; | |
287 | target_ulong reserved; | |
288 | struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ | |
289 | struct target_xmmreg _xmm[8]; | |
290 | target_ulong padding[56]; | |
291 | }; | |
292 | ||
293 | #define X86_FXSR_MAGIC 0x0000 | |
294 | ||
295 | struct target_sigcontext { | |
296 | uint16_t gs, __gsh; | |
297 | uint16_t fs, __fsh; | |
298 | uint16_t es, __esh; | |
299 | uint16_t ds, __dsh; | |
300 | target_ulong edi; | |
301 | target_ulong esi; | |
302 | target_ulong ebp; | |
303 | target_ulong esp; | |
304 | target_ulong ebx; | |
305 | target_ulong edx; | |
306 | target_ulong ecx; | |
307 | target_ulong eax; | |
308 | target_ulong trapno; | |
309 | target_ulong err; | |
310 | target_ulong eip; | |
311 | uint16_t cs, __csh; | |
312 | target_ulong eflags; | |
313 | target_ulong esp_at_signal; | |
314 | uint16_t ss, __ssh; | |
315 | target_ulong fpstate; /* pointer */ | |
316 | target_ulong oldmask; | |
317 | target_ulong cr2; | |
318 | }; | |
319 | ||
320 | typedef struct target_sigaltstack { | |
321 | target_ulong ss_sp; | |
322 | int ss_flags; | |
323 | target_ulong ss_size; | |
324 | } target_stack_t; | |
325 | ||
326 | struct target_ucontext { | |
327 | target_ulong uc_flags; | |
328 | target_ulong uc_link; | |
329 | target_stack_t uc_stack; | |
330 | struct target_sigcontext uc_mcontext; | |
331 | target_sigset_t uc_sigmask; /* mask last for extensibility */ | |
332 | }; | |
333 | ||
334 | struct sigframe | |
335 | { | |
336 | target_ulong pretcode; | |
337 | int sig; | |
338 | struct target_sigcontext sc; | |
339 | struct target_fpstate fpstate; | |
340 | target_ulong extramask[TARGET_NSIG_WORDS-1]; | |
341 | char retcode[8]; | |
342 | }; | |
343 | ||
344 | struct rt_sigframe | |
345 | { | |
346 | target_ulong pretcode; | |
347 | int sig; | |
348 | target_ulong pinfo; | |
349 | target_ulong puc; | |
350 | struct target_siginfo info; | |
351 | struct target_ucontext uc; | |
352 | struct target_fpstate fpstate; | |
353 | char retcode[8]; | |
354 | }; | |
355 | ||
356 | /* | |
357 | * Set up a signal frame. | |
358 | */ | |
359 | ||
360 | #define __put_user(x,ptr)\ | |
361 | ({\ | |
362 | int size = sizeof(*ptr);\ | |
363 | switch(size) {\ | |
364 | case 1:\ | |
365 | stb(ptr, (typeof(*ptr))(x));\ | |
366 | break;\ | |
367 | case 2:\ | |
368 | stw(ptr, (typeof(*ptr))(x));\ | |
369 | break;\ | |
370 | case 4:\ | |
371 | stl(ptr, (typeof(*ptr))(x));\ | |
372 | break;\ | |
373 | case 8:\ | |
374 | stq(ptr, (typeof(*ptr))(x));\ | |
375 | break;\ | |
376 | default:\ | |
377 | abort();\ | |
378 | }\ | |
379 | 0;\ | |
380 | }) | |
381 | ||
382 | #define get_user(val, ptr) (typeof(*ptr))(*(ptr)) | |
383 | ||
384 | ||
385 | #define __copy_to_user(dst, src, size)\ | |
386 | ({\ | |
387 | memcpy(dst, src, size);\ | |
388 | 0;\ | |
389 | }) | |
390 | ||
391 | static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, siginfo_t *info) | |
392 | { | |
393 | host_to_target_siginfo(tinfo, info); | |
394 | return 0; | |
395 | } | |
396 | ||
397 | /* XXX: save x87 state */ | |
398 | static int | |
399 | setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, | |
400 | CPUX86State *env, unsigned long mask) | |
401 | { | |
402 | int err = 0; | |
403 | ||
404 | err |= __put_user(env->segs[R_GS], (unsigned int *)&sc->gs); | |
405 | err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs); | |
406 | err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es); | |
407 | err |= __put_user(env->segs[R_DS], (unsigned int *)&sc->ds); | |
408 | err |= __put_user(env->regs[R_EDI], &sc->edi); | |
409 | err |= __put_user(env->regs[R_ESI], &sc->esi); | |
410 | err |= __put_user(env->regs[R_EBP], &sc->ebp); | |
411 | err |= __put_user(env->regs[R_ESP], &sc->esp); | |
412 | err |= __put_user(env->regs[R_EBX], &sc->ebx); | |
413 | err |= __put_user(env->regs[R_EDX], &sc->edx); | |
414 | err |= __put_user(env->regs[R_ECX], &sc->ecx); | |
415 | err |= __put_user(env->regs[R_EAX], &sc->eax); | |
416 | err |= __put_user(/*current->thread.trap_no*/ 0, &sc->trapno); | |
417 | err |= __put_user(/*current->thread.error_code*/ 0, &sc->err); | |
418 | err |= __put_user(env->eip, &sc->eip); | |
419 | err |= __put_user(env->segs[R_CS], (unsigned int *)&sc->cs); | |
420 | err |= __put_user(env->eflags, &sc->eflags); | |
421 | err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal); | |
422 | err |= __put_user(env->segs[R_SS], (unsigned int *)&sc->ss); | |
423 | #if 0 | |
424 | tmp = save_i387(fpstate); | |
425 | if (tmp < 0) | |
426 | err = 1; | |
427 | else | |
428 | err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate); | |
429 | #else | |
430 | err |= __put_user(0, &sc->fpstate); | |
431 | #endif | |
432 | /* non-iBCS2 extensions.. */ | |
433 | err |= __put_user(mask, &sc->oldmask); | |
434 | err |= __put_user(/*current->thread.cr2*/ 0, &sc->cr2); | |
435 | ||
436 | return err; | |
31e31b8a FB |
437 | } |
438 | ||
66fb9763 FB |
439 | /* |
440 | * Determine which stack to use.. | |
441 | */ | |
31e31b8a | 442 | |
66fb9763 FB |
443 | static inline void * |
444 | get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size) | |
31e31b8a | 445 | { |
66fb9763 FB |
446 | unsigned long esp; |
447 | ||
448 | /* Default to using normal stack */ | |
449 | esp = env->regs[R_ESP]; | |
450 | #if 0 | |
451 | /* This is the X/Open sanctioned signal stack switching. */ | |
452 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
453 | if (sas_ss_flags(esp) == 0) | |
454 | esp = current->sas_ss_sp + current->sas_ss_size; | |
455 | } | |
456 | ||
457 | /* This is the legacy signal stack switching. */ | |
458 | else if ((regs->xss & 0xffff) != __USER_DS && | |
459 | !(ka->sa.sa_flags & SA_RESTORER) && | |
460 | ka->sa.sa_restorer) { | |
461 | esp = (unsigned long) ka->sa.sa_restorer; | |
462 | } | |
463 | #endif | |
464 | return (void *)((esp - frame_size) & -8ul); | |
465 | } | |
466 | ||
467 | #define TF_MASK TRAP_FLAG | |
468 | ||
469 | static void setup_frame(int sig, struct emulated_sigaction *ka, | |
470 | target_sigset_t *set, CPUX86State *env) | |
471 | { | |
472 | struct sigframe *frame; | |
473 | int err = 0; | |
474 | ||
475 | frame = get_sigframe(ka, env, sizeof(*frame)); | |
476 | ||
477 | #if 0 | |
478 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
479 | goto give_sigsegv; | |
480 | #endif | |
481 | err |= __put_user((/*current->exec_domain | |
482 | && current->exec_domain->signal_invmap | |
483 | && sig < 32 | |
484 | ? current->exec_domain->signal_invmap[sig] | |
485 | : */ sig), | |
486 | &frame->sig); | |
487 | if (err) | |
488 | goto give_sigsegv; | |
489 | ||
490 | setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]); | |
491 | if (err) | |
492 | goto give_sigsegv; | |
493 | ||
494 | if (TARGET_NSIG_WORDS > 1) { | |
495 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
496 | sizeof(frame->extramask)); | |
497 | } | |
498 | if (err) | |
499 | goto give_sigsegv; | |
500 | ||
501 | /* Set up to return from userspace. If provided, use a stub | |
502 | already in userspace. */ | |
503 | if (ka->sa.sa_flags & TARGET_SA_RESTORER) { | |
504 | err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); | |
505 | } else { | |
506 | err |= __put_user(frame->retcode, &frame->pretcode); | |
507 | /* This is popl %eax ; movl $,%eax ; int $0x80 */ | |
508 | err |= __put_user(0xb858, (short *)(frame->retcode+0)); | |
509 | err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2)); | |
510 | err |= __put_user(0x80cd, (short *)(frame->retcode+6)); | |
511 | } | |
512 | ||
513 | if (err) | |
514 | goto give_sigsegv; | |
515 | ||
516 | /* Set up registers for signal handler */ | |
517 | env->regs[R_ESP] = (unsigned long) frame; | |
518 | env->eip = (unsigned long) ka->sa._sa_handler; | |
519 | ||
520 | cpu_x86_load_seg(env, R_DS, __USER_DS); | |
521 | cpu_x86_load_seg(env, R_ES, __USER_DS); | |
522 | cpu_x86_load_seg(env, R_SS, __USER_DS); | |
523 | cpu_x86_load_seg(env, R_CS, __USER_CS); | |
524 | env->eflags &= ~TF_MASK; | |
525 | ||
526 | return; | |
527 | ||
528 | give_sigsegv: | |
529 | if (sig == TARGET_SIGSEGV) | |
530 | ka->sa._sa_handler = TARGET_SIG_DFL; | |
531 | force_sig(TARGET_SIGSEGV /* , current */); | |
532 | } | |
533 | ||
534 | static void setup_rt_frame(int sig, struct emulated_sigaction *ka, siginfo_t *info, | |
535 | target_sigset_t *set, CPUX86State *env) | |
536 | { | |
537 | struct rt_sigframe *frame; | |
538 | int err = 0; | |
539 | ||
540 | frame = get_sigframe(ka, env, sizeof(*frame)); | |
541 | ||
542 | #if 0 | |
543 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
544 | goto give_sigsegv; | |
545 | #endif | |
546 | ||
547 | err |= __put_user((/*current->exec_domain | |
548 | && current->exec_domain->signal_invmap | |
549 | && sig < 32 | |
550 | ? current->exec_domain->signal_invmap[sig] | |
551 | : */sig), | |
552 | &frame->sig); | |
553 | err |= __put_user((target_ulong)&frame->info, &frame->pinfo); | |
554 | err |= __put_user((target_ulong)&frame->uc, &frame->puc); | |
555 | err |= copy_siginfo_to_user(&frame->info, info); | |
556 | if (err) | |
557 | goto give_sigsegv; | |
31e31b8a | 558 | |
66fb9763 FB |
559 | /* Create the ucontext. */ |
560 | err |= __put_user(0, &frame->uc.uc_flags); | |
561 | err |= __put_user(0, &frame->uc.uc_link); | |
562 | err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp); | |
563 | err |= __put_user(/* sas_ss_flags(regs->esp) */ 0, | |
564 | &frame->uc.uc_stack.ss_flags); | |
565 | err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size); | |
566 | err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, | |
567 | env, set->sig[0]); | |
568 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
569 | if (err) | |
570 | goto give_sigsegv; | |
31e31b8a | 571 | |
66fb9763 FB |
572 | /* Set up to return from userspace. If provided, use a stub |
573 | already in userspace. */ | |
574 | if (ka->sa.sa_flags & TARGET_SA_RESTORER) { | |
575 | err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); | |
576 | } else { | |
577 | err |= __put_user(frame->retcode, &frame->pretcode); | |
578 | /* This is movl $,%eax ; int $0x80 */ | |
579 | err |= __put_user(0xb8, (char *)(frame->retcode+0)); | |
580 | err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1)); | |
581 | err |= __put_user(0x80cd, (short *)(frame->retcode+5)); | |
582 | } | |
583 | ||
584 | if (err) | |
585 | goto give_sigsegv; | |
586 | ||
587 | /* Set up registers for signal handler */ | |
588 | env->regs[R_ESP] = (unsigned long) frame; | |
589 | env->eip = (unsigned long) ka->sa._sa_handler; | |
590 | ||
591 | cpu_x86_load_seg(env, R_DS, __USER_DS); | |
592 | cpu_x86_load_seg(env, R_ES, __USER_DS); | |
593 | cpu_x86_load_seg(env, R_SS, __USER_DS); | |
594 | cpu_x86_load_seg(env, R_CS, __USER_CS); | |
595 | env->eflags &= ~TF_MASK; | |
596 | ||
597 | return; | |
598 | ||
599 | give_sigsegv: | |
600 | if (sig == TARGET_SIGSEGV) | |
601 | ka->sa._sa_handler = TARGET_SIG_DFL; | |
602 | force_sig(TARGET_SIGSEGV /* , current */); | |
603 | } | |
604 | ||
605 | static int | |
606 | restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax) | |
607 | { | |
608 | unsigned int err = 0; | |
609 | ||
610 | ||
611 | ||
612 | #define COPY(x) err |= __get_user(regs->x, &sc->x) | |
613 | ||
614 | #define COPY_SEG(seg) \ | |
615 | { unsigned short tmp; \ | |
616 | err |= __get_user(tmp, &sc->seg); \ | |
617 | regs->x##seg = tmp; } | |
618 | ||
619 | #define COPY_SEG_STRICT(seg) \ | |
620 | { unsigned short tmp; \ | |
621 | err |= __get_user(tmp, &sc->seg); \ | |
622 | regs->x##seg = tmp|3; } | |
623 | ||
624 | #define GET_SEG(seg) \ | |
625 | { unsigned short tmp; \ | |
626 | err |= __get_user(tmp, &sc->seg); \ | |
627 | loadsegment(seg,tmp); } | |
628 | ||
629 | cpu_x86_load_seg(env, R_GS, lduw(&sc->gs)); | |
630 | cpu_x86_load_seg(env, R_FS, lduw(&sc->fs)); | |
631 | cpu_x86_load_seg(env, R_ES, lduw(&sc->es)); | |
632 | cpu_x86_load_seg(env, R_DS, lduw(&sc->ds)); | |
633 | ||
634 | env->regs[R_EDI] = ldl(&sc->edi); | |
635 | env->regs[R_ESI] = ldl(&sc->esi); | |
636 | env->regs[R_EBP] = ldl(&sc->ebp); | |
637 | env->regs[R_ESP] = ldl(&sc->esp); | |
638 | env->regs[R_EBX] = ldl(&sc->ebx); | |
639 | env->regs[R_EDX] = ldl(&sc->edx); | |
640 | env->regs[R_ECX] = ldl(&sc->ecx); | |
641 | env->eip = ldl(&sc->eip); | |
642 | ||
643 | cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3); | |
644 | cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3); | |
645 | ||
646 | { | |
647 | unsigned int tmpflags; | |
648 | tmpflags = ldl(&sc->eflags); | |
649 | env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); | |
650 | // regs->orig_eax = -1; /* disable syscall checks */ | |
651 | } | |
652 | ||
653 | #if 0 | |
654 | { | |
655 | struct _fpstate * buf; | |
656 | err |= __get_user(buf, &sc->fpstate); | |
657 | if (buf) { | |
658 | if (verify_area(VERIFY_READ, buf, sizeof(*buf))) | |
659 | goto badframe; | |
660 | err |= restore_i387(buf); | |
661 | } | |
662 | } | |
663 | #endif | |
664 | *peax = ldl(&sc->eax); | |
665 | return err; | |
666 | #if 0 | |
667 | badframe: | |
668 | return 1; | |
669 | #endif | |
670 | } | |
671 | ||
672 | long do_sigreturn(CPUX86State *env) | |
673 | { | |
674 | struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8); | |
675 | target_sigset_t target_set; | |
676 | sigset_t set; | |
677 | int eax, i; | |
678 | ||
679 | /* set blocked signals */ | |
680 | target_set.sig[0] = frame->sc.oldmask; | |
681 | for(i = 1; i < TARGET_NSIG_WORDS; i++) | |
682 | target_set.sig[i] = frame->extramask[i - 1]; | |
683 | ||
684 | target_to_host_sigset(&set, &target_set); | |
685 | sigprocmask(SIG_SETMASK, &set, NULL); | |
686 | ||
687 | /* restore registers */ | |
688 | if (restore_sigcontext(env, &frame->sc, &eax)) | |
689 | goto badframe; | |
690 | return eax; | |
691 | ||
692 | badframe: | |
693 | force_sig(TARGET_SIGSEGV); | |
694 | return 0; | |
695 | } | |
696 | ||
697 | long do_rt_sigreturn(CPUX86State *env) | |
698 | { | |
699 | struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4); | |
700 | target_sigset_t target_set; | |
701 | sigset_t set; | |
702 | // stack_t st; | |
703 | int eax; | |
704 | ||
705 | #if 0 | |
706 | if (verify_area(VERIFY_READ, frame, sizeof(*frame))) | |
707 | goto badframe; | |
708 | #endif | |
709 | memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t)); | |
710 | ||
711 | target_to_host_sigset(&set, &target_set); | |
712 | sigprocmask(SIG_SETMASK, &set, NULL); | |
713 | ||
714 | if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax)) | |
715 | goto badframe; | |
716 | ||
717 | #if 0 | |
718 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) | |
719 | goto badframe; | |
720 | /* It is more difficult to avoid calling this function than to | |
721 | call it and ignore errors. */ | |
722 | do_sigaltstack(&st, NULL, regs->esp); | |
723 | #endif | |
724 | return eax; | |
725 | ||
726 | badframe: | |
727 | force_sig(TARGET_SIGSEGV); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | #endif | |
732 | ||
733 | void process_pending_signals(void *cpu_env) | |
734 | { | |
735 | int sig; | |
736 | target_ulong handler; | |
737 | target_sigset_t set; | |
738 | struct emulated_sigaction *k; | |
739 | struct sigqueue *q; | |
740 | ||
31e31b8a FB |
741 | if (!signal_pending) |
742 | return; | |
743 | ||
66fb9763 FB |
744 | k = sigact_table; |
745 | for(sig = 1; sig <= TARGET_NSIG; sig++) { | |
746 | if (k->pending) | |
31e31b8a | 747 | goto handle_signal; |
66fb9763 | 748 | k++; |
31e31b8a FB |
749 | } |
750 | /* if no signal is pending, just return */ | |
751 | signal_pending = 0; | |
752 | return; | |
66fb9763 | 753 | |
31e31b8a | 754 | handle_signal: |
66fb9763 FB |
755 | #ifdef DEBUG_SIGNAL |
756 | fprintf(stderr, "gemu: process signal %d\n", sig); | |
757 | #endif | |
758 | /* dequeue signal */ | |
759 | q = k->first; | |
760 | k->first = q->next; | |
761 | if (!k->first) | |
762 | k->pending = 0; | |
763 | ||
764 | handler = k->sa._sa_handler; | |
765 | if (handler == TARGET_SIG_DFL) { | |
766 | /* default handler : ignore some signal. The other are fatal */ | |
767 | if (sig != TARGET_SIGCHLD && | |
768 | sig != TARGET_SIGURG && | |
769 | sig != TARGET_SIGWINCH) { | |
770 | force_sig(sig); | |
771 | } | |
772 | } else if (handler == TARGET_SIG_IGN) { | |
773 | /* ignore sig */ | |
774 | } else if (handler == TARGET_SIG_ERR) { | |
775 | force_sig(sig); | |
776 | } else { | |
777 | set = k->sa.sa_mask; | |
778 | /* send the signal to the CPU */ | |
779 | if (k->sa.sa_flags & TARGET_SA_SIGINFO) | |
780 | setup_rt_frame(sig, k, &q->info, &set, cpu_env); | |
781 | else | |
782 | setup_frame(sig, k, &set, cpu_env); | |
783 | if (k->sa.sa_flags & TARGET_SA_RESETHAND) | |
784 | k->sa._sa_handler = TARGET_SIG_DFL; | |
31e31b8a | 785 | } |
66fb9763 FB |
786 | if (q != &k->info) |
787 | free_sigqueue(q); | |
788 | } | |
31e31b8a FB |
789 | |
790 |