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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 | 23 | #include <stdarg.h> |
2677e107 | 24 | #include <unistd.h> |
31e31b8a | 25 | #include <signal.h> |
66fb9763 | 26 | #include <errno.h> |
31e31b8a FB |
27 | #include <sys/ucontext.h> |
28 | ||
3ef693a0 | 29 | #include "qemu.h" |
66fb9763 FB |
30 | |
31 | //#define DEBUG_SIGNAL | |
32 | ||
33 | #define MAX_SIGQUEUE_SIZE 1024 | |
34 | ||
35 | struct sigqueue { | |
36 | struct sigqueue *next; | |
9de5e440 | 37 | target_siginfo_t info; |
66fb9763 | 38 | }; |
31e31b8a FB |
39 | |
40 | struct emulated_sigaction { | |
41 | struct target_sigaction sa; | |
66fb9763 FB |
42 | int pending; /* true if signal is pending */ |
43 | struct sigqueue *first; | |
44 | struct sigqueue info; /* in order to always have memory for the | |
45 | first signal, we put it here */ | |
31e31b8a FB |
46 | }; |
47 | ||
66fb9763 FB |
48 | static struct emulated_sigaction sigact_table[TARGET_NSIG]; |
49 | static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */ | |
50 | static struct sigqueue *first_free; /* first free siginfo queue entry */ | |
51 | static int signal_pending; /* non zero if a signal may be pending */ | |
31e31b8a | 52 | |
66fb9763 FB |
53 | static void host_signal_handler(int host_signum, siginfo_t *info, |
54 | void *puc); | |
55 | ||
56 | /* XXX: do it properly */ | |
31e31b8a FB |
57 | static inline int host_to_target_signal(int sig) |
58 | { | |
59 | return sig; | |
60 | } | |
61 | ||
62 | static inline int target_to_host_signal(int sig) | |
63 | { | |
64 | return sig; | |
65 | } | |
66 | ||
66fb9763 FB |
67 | void host_to_target_sigset(target_sigset_t *d, sigset_t *s) |
68 | { | |
69 | int i; | |
70 | for(i = 0;i < TARGET_NSIG_WORDS; i++) { | |
71 | d->sig[i] = tswapl(((unsigned long *)s)[i]); | |
72 | } | |
73 | } | |
74 | ||
75 | void target_to_host_sigset(sigset_t *d, target_sigset_t *s) | |
76 | { | |
77 | int i; | |
78 | for(i = 0;i < TARGET_NSIG_WORDS; i++) { | |
79 | ((unsigned long *)d)[i] = tswapl(s->sig[i]); | |
80 | } | |
81 | } | |
82 | ||
83 | void host_to_target_old_sigset(target_ulong *old_sigset, | |
84 | const sigset_t *sigset) | |
85 | { | |
86 | *old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff); | |
87 | } | |
88 | ||
89 | void target_to_host_old_sigset(sigset_t *sigset, | |
90 | const target_ulong *old_sigset) | |
91 | { | |
92 | sigemptyset(sigset); | |
93 | *(unsigned long *)sigset = tswapl(*old_sigset); | |
94 | } | |
95 | ||
9de5e440 FB |
96 | /* siginfo conversion */ |
97 | ||
98 | static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, | |
99 | const siginfo_t *info) | |
66fb9763 | 100 | { |
9de5e440 FB |
101 | int sig; |
102 | sig = host_to_target_signal(info->si_signo); | |
103 | tinfo->si_signo = sig; | |
104 | tinfo->si_errno = 0; | |
105 | tinfo->si_code = 0; | |
106 | if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) { | |
107 | /* should never come here, but who knows. The information for | |
108 | the target is irrelevant */ | |
109 | tinfo->_sifields._sigfault._addr = 0; | |
110 | } else if (sig >= TARGET_SIGRTMIN) { | |
111 | tinfo->_sifields._rt._pid = info->si_pid; | |
112 | tinfo->_sifields._rt._uid = info->si_uid; | |
113 | /* XXX: potential problem if 64 bit */ | |
114 | tinfo->_sifields._rt._sigval.sival_ptr = | |
115 | (target_ulong)info->si_value.sival_ptr; | |
116 | } | |
117 | } | |
118 | ||
119 | static void tswap_siginfo(target_siginfo_t *tinfo, | |
120 | const target_siginfo_t *info) | |
121 | { | |
122 | int sig; | |
123 | sig = info->si_signo; | |
124 | tinfo->si_signo = tswap32(sig); | |
66fb9763 FB |
125 | tinfo->si_errno = tswap32(info->si_errno); |
126 | tinfo->si_code = tswap32(info->si_code); | |
9de5e440 FB |
127 | if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) { |
128 | tinfo->_sifields._sigfault._addr = | |
129 | tswapl(info->_sifields._sigfault._addr); | |
130 | } else if (sig >= TARGET_SIGRTMIN) { | |
131 | tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid); | |
132 | tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid); | |
133 | tinfo->_sifields._rt._sigval.sival_ptr = | |
134 | tswapl(info->_sifields._rt._sigval.sival_ptr); | |
135 | } | |
136 | } | |
137 | ||
138 | ||
139 | void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info) | |
140 | { | |
141 | host_to_target_siginfo_noswap(tinfo, info); | |
142 | tswap_siginfo(tinfo, tinfo); | |
66fb9763 FB |
143 | } |
144 | ||
9de5e440 FB |
145 | /* XXX: we support only POSIX RT signals are used. */ |
146 | /* XXX: find a solution for 64 bit (additionnal malloced data is needed) */ | |
147 | void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo) | |
66fb9763 FB |
148 | { |
149 | info->si_signo = tswap32(tinfo->si_signo); | |
150 | info->si_errno = tswap32(tinfo->si_errno); | |
151 | info->si_code = tswap32(tinfo->si_code); | |
9de5e440 FB |
152 | info->si_pid = tswap32(tinfo->_sifields._rt._pid); |
153 | info->si_uid = tswap32(tinfo->_sifields._rt._uid); | |
154 | info->si_value.sival_ptr = | |
155 | (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr); | |
66fb9763 FB |
156 | } |
157 | ||
31e31b8a FB |
158 | void signal_init(void) |
159 | { | |
160 | struct sigaction act; | |
161 | int i; | |
162 | ||
9de5e440 FB |
163 | /* set all host signal handlers. ALL signals are blocked during |
164 | the handlers to serialize them. */ | |
165 | sigfillset(&act.sa_mask); | |
31e31b8a FB |
166 | act.sa_flags = SA_SIGINFO; |
167 | act.sa_sigaction = host_signal_handler; | |
168 | for(i = 1; i < NSIG; i++) { | |
66fb9763 | 169 | sigaction(i, &act, NULL); |
31e31b8a FB |
170 | } |
171 | ||
172 | memset(sigact_table, 0, sizeof(sigact_table)); | |
66fb9763 FB |
173 | |
174 | first_free = &sigqueue_table[0]; | |
175 | for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) | |
176 | sigqueue_table[i].next = &sigqueue_table[i + 1]; | |
177 | sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL; | |
178 | } | |
179 | ||
180 | /* signal queue handling */ | |
181 | ||
182 | static inline struct sigqueue *alloc_sigqueue(void) | |
183 | { | |
184 | struct sigqueue *q = first_free; | |
185 | if (!q) | |
186 | return NULL; | |
187 | first_free = q->next; | |
188 | return q; | |
31e31b8a FB |
189 | } |
190 | ||
66fb9763 FB |
191 | static inline void free_sigqueue(struct sigqueue *q) |
192 | { | |
193 | q->next = first_free; | |
194 | first_free = q; | |
195 | } | |
196 | ||
9de5e440 FB |
197 | /* abort execution with signal */ |
198 | void __attribute((noreturn)) force_sig(int sig) | |
66fb9763 FB |
199 | { |
200 | int host_sig; | |
66fb9763 | 201 | host_sig = target_to_host_signal(sig); |
bc8a22cc | 202 | fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n", |
66fb9763 | 203 | sig, strsignal(host_sig)); |
9de5e440 | 204 | #if 1 |
66fb9763 | 205 | _exit(-host_sig); |
9de5e440 FB |
206 | #else |
207 | { | |
208 | struct sigaction act; | |
209 | sigemptyset(&act.sa_mask); | |
210 | act.sa_flags = SA_SIGINFO; | |
211 | act.sa_sigaction = SIG_DFL; | |
212 | sigaction(SIGABRT, &act, NULL); | |
213 | abort(); | |
214 | } | |
215 | #endif | |
66fb9763 FB |
216 | } |
217 | ||
9de5e440 FB |
218 | /* queue a signal so that it will be send to the virtual CPU as soon |
219 | as possible */ | |
220 | int queue_signal(int sig, target_siginfo_t *info) | |
31e31b8a | 221 | { |
66fb9763 | 222 | struct emulated_sigaction *k; |
9de5e440 | 223 | struct sigqueue *q, **pq; |
66fb9763 FB |
224 | target_ulong handler; |
225 | ||
9de5e440 | 226 | #if defined(DEBUG_SIGNAL) |
bc8a22cc | 227 | fprintf(stderr, "queue_signal: sig=%d\n", |
9de5e440 | 228 | sig); |
66fb9763 | 229 | #endif |
9de5e440 | 230 | k = &sigact_table[sig - 1]; |
66fb9763 FB |
231 | handler = k->sa._sa_handler; |
232 | if (handler == TARGET_SIG_DFL) { | |
233 | /* default handler : ignore some signal. The other are fatal */ | |
234 | if (sig != TARGET_SIGCHLD && | |
235 | sig != TARGET_SIGURG && | |
236 | sig != TARGET_SIGWINCH) { | |
237 | force_sig(sig); | |
9de5e440 FB |
238 | } else { |
239 | return 0; /* indicate ignored */ | |
66fb9763 FB |
240 | } |
241 | } else if (handler == TARGET_SIG_IGN) { | |
242 | /* ignore signal */ | |
9de5e440 | 243 | return 0; |
66fb9763 FB |
244 | } else if (handler == TARGET_SIG_ERR) { |
245 | force_sig(sig); | |
246 | } else { | |
9de5e440 FB |
247 | pq = &k->first; |
248 | if (sig < TARGET_SIGRTMIN) { | |
249 | /* if non real time signal, we queue exactly one signal */ | |
250 | if (!k->pending) | |
251 | q = &k->info; | |
252 | else | |
253 | return 0; | |
254 | } else { | |
255 | if (!k->pending) { | |
256 | /* first signal */ | |
257 | q = &k->info; | |
258 | } else { | |
259 | q = alloc_sigqueue(); | |
260 | if (!q) | |
261 | return -EAGAIN; | |
262 | while (*pq != NULL) | |
263 | pq = &(*pq)->next; | |
264 | } | |
265 | } | |
266 | *pq = q; | |
267 | q->info = *info; | |
268 | q->next = NULL; | |
269 | k->pending = 1; | |
270 | /* signal that a new signal is pending */ | |
271 | signal_pending = 1; | |
272 | return 1; /* indicates that the signal was queued */ | |
273 | } | |
274 | } | |
275 | ||
276 | #if defined(DEBUG_SIGNAL) | |
277 | #ifdef __i386__ | |
278 | static void dump_regs(struct ucontext *uc) | |
279 | { | |
280 | fprintf(stderr, | |
281 | "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n" | |
282 | "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n" | |
283 | "EFL=%08x EIP=%08x\n", | |
284 | uc->uc_mcontext.gregs[EAX], | |
285 | uc->uc_mcontext.gregs[EBX], | |
286 | uc->uc_mcontext.gregs[ECX], | |
287 | uc->uc_mcontext.gregs[EDX], | |
288 | uc->uc_mcontext.gregs[ESI], | |
289 | uc->uc_mcontext.gregs[EDI], | |
290 | uc->uc_mcontext.gregs[EBP], | |
291 | uc->uc_mcontext.gregs[ESP], | |
292 | uc->uc_mcontext.gregs[EFL], | |
293 | uc->uc_mcontext.gregs[EIP]); | |
294 | } | |
295 | #else | |
296 | static void dump_regs(struct ucontext *uc) | |
297 | { | |
298 | } | |
299 | #endif | |
300 | ||
301 | #endif | |
302 | ||
303 | static void host_signal_handler(int host_signum, siginfo_t *info, | |
304 | void *puc) | |
305 | { | |
306 | int sig; | |
307 | target_siginfo_t tinfo; | |
308 | ||
309 | /* the CPU emulator uses some host signals to detect exceptions, | |
310 | we we forward to it some signals */ | |
311 | if (host_signum == SIGSEGV || host_signum == SIGBUS) { | |
312 | if (cpu_x86_signal_handler(host_signum, info, puc)) | |
313 | return; | |
314 | } | |
315 | ||
316 | /* get target signal number */ | |
317 | sig = host_to_target_signal(host_signum); | |
318 | if (sig < 1 || sig > TARGET_NSIG) | |
319 | return; | |
320 | #if defined(DEBUG_SIGNAL) | |
bc8a22cc | 321 | fprintf(stderr, "qemu: got signal %d\n", sig); |
9de5e440 FB |
322 | dump_regs(puc); |
323 | #endif | |
324 | host_to_target_siginfo_noswap(&tinfo, info); | |
325 | if (queue_signal(sig, &tinfo) == 1) { | |
326 | /* interrupt the virtual CPU as soon as possible */ | |
327 | cpu_x86_interrupt(global_env); | |
66fb9763 FB |
328 | } |
329 | } | |
330 | ||
331 | int do_sigaction(int sig, const struct target_sigaction *act, | |
332 | struct target_sigaction *oact) | |
333 | { | |
334 | struct emulated_sigaction *k; | |
335 | ||
336 | if (sig < 1 || sig > TARGET_NSIG) | |
337 | return -EINVAL; | |
338 | k = &sigact_table[sig - 1]; | |
339 | #if defined(DEBUG_SIGNAL) && 0 | |
340 | fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n", | |
341 | sig, (int)act, (int)oact); | |
342 | #endif | |
343 | if (oact) { | |
344 | oact->_sa_handler = tswapl(k->sa._sa_handler); | |
345 | oact->sa_flags = tswapl(k->sa.sa_flags); | |
346 | oact->sa_restorer = tswapl(k->sa.sa_restorer); | |
347 | oact->sa_mask = k->sa.sa_mask; | |
348 | } | |
349 | if (act) { | |
350 | k->sa._sa_handler = tswapl(act->_sa_handler); | |
351 | k->sa.sa_flags = tswapl(act->sa_flags); | |
352 | k->sa.sa_restorer = tswapl(act->sa_restorer); | |
353 | k->sa.sa_mask = act->sa_mask; | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
358 | #ifdef TARGET_I386 | |
359 | ||
360 | /* from the Linux kernel */ | |
361 | ||
362 | struct target_fpreg { | |
363 | uint16_t significand[4]; | |
364 | uint16_t exponent; | |
365 | }; | |
366 | ||
367 | struct target_fpxreg { | |
368 | uint16_t significand[4]; | |
369 | uint16_t exponent; | |
370 | uint16_t padding[3]; | |
371 | }; | |
372 | ||
373 | struct target_xmmreg { | |
374 | target_ulong element[4]; | |
375 | }; | |
376 | ||
377 | struct target_fpstate { | |
378 | /* Regular FPU environment */ | |
379 | target_ulong cw; | |
380 | target_ulong sw; | |
381 | target_ulong tag; | |
382 | target_ulong ipoff; | |
383 | target_ulong cssel; | |
384 | target_ulong dataoff; | |
385 | target_ulong datasel; | |
386 | struct target_fpreg _st[8]; | |
387 | uint16_t status; | |
388 | uint16_t magic; /* 0xffff = regular FPU data only */ | |
389 | ||
390 | /* FXSR FPU environment */ | |
391 | target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ | |
392 | target_ulong mxcsr; | |
393 | target_ulong reserved; | |
394 | struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ | |
395 | struct target_xmmreg _xmm[8]; | |
396 | target_ulong padding[56]; | |
397 | }; | |
398 | ||
399 | #define X86_FXSR_MAGIC 0x0000 | |
400 | ||
401 | struct target_sigcontext { | |
402 | uint16_t gs, __gsh; | |
403 | uint16_t fs, __fsh; | |
404 | uint16_t es, __esh; | |
405 | uint16_t ds, __dsh; | |
406 | target_ulong edi; | |
407 | target_ulong esi; | |
408 | target_ulong ebp; | |
409 | target_ulong esp; | |
410 | target_ulong ebx; | |
411 | target_ulong edx; | |
412 | target_ulong ecx; | |
413 | target_ulong eax; | |
414 | target_ulong trapno; | |
415 | target_ulong err; | |
416 | target_ulong eip; | |
417 | uint16_t cs, __csh; | |
418 | target_ulong eflags; | |
419 | target_ulong esp_at_signal; | |
420 | uint16_t ss, __ssh; | |
421 | target_ulong fpstate; /* pointer */ | |
422 | target_ulong oldmask; | |
423 | target_ulong cr2; | |
424 | }; | |
425 | ||
426 | typedef struct target_sigaltstack { | |
427 | target_ulong ss_sp; | |
428 | int ss_flags; | |
429 | target_ulong ss_size; | |
430 | } target_stack_t; | |
431 | ||
432 | struct target_ucontext { | |
433 | target_ulong uc_flags; | |
434 | target_ulong uc_link; | |
435 | target_stack_t uc_stack; | |
436 | struct target_sigcontext uc_mcontext; | |
437 | target_sigset_t uc_sigmask; /* mask last for extensibility */ | |
438 | }; | |
439 | ||
440 | struct sigframe | |
441 | { | |
442 | target_ulong pretcode; | |
443 | int sig; | |
444 | struct target_sigcontext sc; | |
445 | struct target_fpstate fpstate; | |
446 | target_ulong extramask[TARGET_NSIG_WORDS-1]; | |
447 | char retcode[8]; | |
448 | }; | |
449 | ||
450 | struct rt_sigframe | |
451 | { | |
452 | target_ulong pretcode; | |
453 | int sig; | |
454 | target_ulong pinfo; | |
455 | target_ulong puc; | |
456 | struct target_siginfo info; | |
457 | struct target_ucontext uc; | |
458 | struct target_fpstate fpstate; | |
459 | char retcode[8]; | |
460 | }; | |
461 | ||
462 | /* | |
463 | * Set up a signal frame. | |
464 | */ | |
465 | ||
466 | #define __put_user(x,ptr)\ | |
467 | ({\ | |
468 | int size = sizeof(*ptr);\ | |
469 | switch(size) {\ | |
470 | case 1:\ | |
471 | stb(ptr, (typeof(*ptr))(x));\ | |
472 | break;\ | |
473 | case 2:\ | |
474 | stw(ptr, (typeof(*ptr))(x));\ | |
475 | break;\ | |
476 | case 4:\ | |
477 | stl(ptr, (typeof(*ptr))(x));\ | |
478 | break;\ | |
479 | case 8:\ | |
480 | stq(ptr, (typeof(*ptr))(x));\ | |
481 | break;\ | |
482 | default:\ | |
483 | abort();\ | |
484 | }\ | |
485 | 0;\ | |
486 | }) | |
487 | ||
488 | #define get_user(val, ptr) (typeof(*ptr))(*(ptr)) | |
489 | ||
490 | ||
491 | #define __copy_to_user(dst, src, size)\ | |
492 | ({\ | |
493 | memcpy(dst, src, size);\ | |
494 | 0;\ | |
495 | }) | |
496 | ||
9de5e440 FB |
497 | static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, |
498 | const target_siginfo_t *info) | |
66fb9763 | 499 | { |
9de5e440 | 500 | tswap_siginfo(tinfo, info); |
66fb9763 FB |
501 | return 0; |
502 | } | |
503 | ||
504 | /* XXX: save x87 state */ | |
505 | static int | |
506 | setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, | |
507 | CPUX86State *env, unsigned long mask) | |
508 | { | |
509 | int err = 0; | |
510 | ||
511 | err |= __put_user(env->segs[R_GS], (unsigned int *)&sc->gs); | |
512 | err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs); | |
513 | err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es); | |
514 | err |= __put_user(env->segs[R_DS], (unsigned int *)&sc->ds); | |
515 | err |= __put_user(env->regs[R_EDI], &sc->edi); | |
516 | err |= __put_user(env->regs[R_ESI], &sc->esi); | |
517 | err |= __put_user(env->regs[R_EBP], &sc->ebp); | |
518 | err |= __put_user(env->regs[R_ESP], &sc->esp); | |
519 | err |= __put_user(env->regs[R_EBX], &sc->ebx); | |
520 | err |= __put_user(env->regs[R_EDX], &sc->edx); | |
521 | err |= __put_user(env->regs[R_ECX], &sc->ecx); | |
522 | err |= __put_user(env->regs[R_EAX], &sc->eax); | |
523 | err |= __put_user(/*current->thread.trap_no*/ 0, &sc->trapno); | |
524 | err |= __put_user(/*current->thread.error_code*/ 0, &sc->err); | |
525 | err |= __put_user(env->eip, &sc->eip); | |
526 | err |= __put_user(env->segs[R_CS], (unsigned int *)&sc->cs); | |
527 | err |= __put_user(env->eflags, &sc->eflags); | |
528 | err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal); | |
529 | err |= __put_user(env->segs[R_SS], (unsigned int *)&sc->ss); | |
530 | #if 0 | |
531 | tmp = save_i387(fpstate); | |
532 | if (tmp < 0) | |
533 | err = 1; | |
534 | else | |
535 | err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate); | |
536 | #else | |
537 | err |= __put_user(0, &sc->fpstate); | |
538 | #endif | |
539 | /* non-iBCS2 extensions.. */ | |
540 | err |= __put_user(mask, &sc->oldmask); | |
541 | err |= __put_user(/*current->thread.cr2*/ 0, &sc->cr2); | |
66fb9763 | 542 | return err; |
31e31b8a FB |
543 | } |
544 | ||
66fb9763 FB |
545 | /* |
546 | * Determine which stack to use.. | |
547 | */ | |
31e31b8a | 548 | |
66fb9763 FB |
549 | static inline void * |
550 | get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size) | |
31e31b8a | 551 | { |
66fb9763 FB |
552 | unsigned long esp; |
553 | ||
554 | /* Default to using normal stack */ | |
555 | esp = env->regs[R_ESP]; | |
556 | #if 0 | |
557 | /* This is the X/Open sanctioned signal stack switching. */ | |
558 | if (ka->sa.sa_flags & SA_ONSTACK) { | |
559 | if (sas_ss_flags(esp) == 0) | |
560 | esp = current->sas_ss_sp + current->sas_ss_size; | |
561 | } | |
562 | ||
563 | /* This is the legacy signal stack switching. */ | |
564 | else if ((regs->xss & 0xffff) != __USER_DS && | |
565 | !(ka->sa.sa_flags & SA_RESTORER) && | |
566 | ka->sa.sa_restorer) { | |
567 | esp = (unsigned long) ka->sa.sa_restorer; | |
568 | } | |
569 | #endif | |
570 | return (void *)((esp - frame_size) & -8ul); | |
571 | } | |
572 | ||
66fb9763 FB |
573 | static void setup_frame(int sig, struct emulated_sigaction *ka, |
574 | target_sigset_t *set, CPUX86State *env) | |
575 | { | |
576 | struct sigframe *frame; | |
577 | int err = 0; | |
578 | ||
579 | frame = get_sigframe(ka, env, sizeof(*frame)); | |
580 | ||
581 | #if 0 | |
582 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
583 | goto give_sigsegv; | |
584 | #endif | |
585 | err |= __put_user((/*current->exec_domain | |
586 | && current->exec_domain->signal_invmap | |
587 | && sig < 32 | |
588 | ? current->exec_domain->signal_invmap[sig] | |
589 | : */ sig), | |
590 | &frame->sig); | |
591 | if (err) | |
592 | goto give_sigsegv; | |
593 | ||
594 | setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]); | |
595 | if (err) | |
596 | goto give_sigsegv; | |
597 | ||
598 | if (TARGET_NSIG_WORDS > 1) { | |
599 | err |= __copy_to_user(frame->extramask, &set->sig[1], | |
600 | sizeof(frame->extramask)); | |
601 | } | |
602 | if (err) | |
603 | goto give_sigsegv; | |
604 | ||
605 | /* Set up to return from userspace. If provided, use a stub | |
606 | already in userspace. */ | |
607 | if (ka->sa.sa_flags & TARGET_SA_RESTORER) { | |
608 | err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); | |
609 | } else { | |
610 | err |= __put_user(frame->retcode, &frame->pretcode); | |
611 | /* This is popl %eax ; movl $,%eax ; int $0x80 */ | |
612 | err |= __put_user(0xb858, (short *)(frame->retcode+0)); | |
613 | err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2)); | |
614 | err |= __put_user(0x80cd, (short *)(frame->retcode+6)); | |
615 | } | |
616 | ||
617 | if (err) | |
618 | goto give_sigsegv; | |
619 | ||
620 | /* Set up registers for signal handler */ | |
621 | env->regs[R_ESP] = (unsigned long) frame; | |
622 | env->eip = (unsigned long) ka->sa._sa_handler; | |
623 | ||
624 | cpu_x86_load_seg(env, R_DS, __USER_DS); | |
625 | cpu_x86_load_seg(env, R_ES, __USER_DS); | |
626 | cpu_x86_load_seg(env, R_SS, __USER_DS); | |
627 | cpu_x86_load_seg(env, R_CS, __USER_CS); | |
628 | env->eflags &= ~TF_MASK; | |
629 | ||
630 | return; | |
631 | ||
632 | give_sigsegv: | |
633 | if (sig == TARGET_SIGSEGV) | |
634 | ka->sa._sa_handler = TARGET_SIG_DFL; | |
635 | force_sig(TARGET_SIGSEGV /* , current */); | |
636 | } | |
637 | ||
9de5e440 FB |
638 | static void setup_rt_frame(int sig, struct emulated_sigaction *ka, |
639 | target_siginfo_t *info, | |
66fb9763 FB |
640 | target_sigset_t *set, CPUX86State *env) |
641 | { | |
642 | struct rt_sigframe *frame; | |
643 | int err = 0; | |
644 | ||
645 | frame = get_sigframe(ka, env, sizeof(*frame)); | |
646 | ||
647 | #if 0 | |
648 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) | |
649 | goto give_sigsegv; | |
650 | #endif | |
651 | ||
652 | err |= __put_user((/*current->exec_domain | |
653 | && current->exec_domain->signal_invmap | |
654 | && sig < 32 | |
655 | ? current->exec_domain->signal_invmap[sig] | |
656 | : */sig), | |
657 | &frame->sig); | |
658 | err |= __put_user((target_ulong)&frame->info, &frame->pinfo); | |
659 | err |= __put_user((target_ulong)&frame->uc, &frame->puc); | |
660 | err |= copy_siginfo_to_user(&frame->info, info); | |
661 | if (err) | |
662 | goto give_sigsegv; | |
31e31b8a | 663 | |
66fb9763 FB |
664 | /* Create the ucontext. */ |
665 | err |= __put_user(0, &frame->uc.uc_flags); | |
666 | err |= __put_user(0, &frame->uc.uc_link); | |
667 | err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp); | |
668 | err |= __put_user(/* sas_ss_flags(regs->esp) */ 0, | |
669 | &frame->uc.uc_stack.ss_flags); | |
670 | err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size); | |
671 | err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, | |
672 | env, set->sig[0]); | |
673 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); | |
674 | if (err) | |
675 | goto give_sigsegv; | |
31e31b8a | 676 | |
66fb9763 FB |
677 | /* Set up to return from userspace. If provided, use a stub |
678 | already in userspace. */ | |
679 | if (ka->sa.sa_flags & TARGET_SA_RESTORER) { | |
680 | err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); | |
681 | } else { | |
682 | err |= __put_user(frame->retcode, &frame->pretcode); | |
683 | /* This is movl $,%eax ; int $0x80 */ | |
684 | err |= __put_user(0xb8, (char *)(frame->retcode+0)); | |
685 | err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1)); | |
686 | err |= __put_user(0x80cd, (short *)(frame->retcode+5)); | |
687 | } | |
688 | ||
689 | if (err) | |
690 | goto give_sigsegv; | |
691 | ||
692 | /* Set up registers for signal handler */ | |
693 | env->regs[R_ESP] = (unsigned long) frame; | |
694 | env->eip = (unsigned long) ka->sa._sa_handler; | |
695 | ||
696 | cpu_x86_load_seg(env, R_DS, __USER_DS); | |
697 | cpu_x86_load_seg(env, R_ES, __USER_DS); | |
698 | cpu_x86_load_seg(env, R_SS, __USER_DS); | |
699 | cpu_x86_load_seg(env, R_CS, __USER_CS); | |
700 | env->eflags &= ~TF_MASK; | |
701 | ||
702 | return; | |
703 | ||
704 | give_sigsegv: | |
705 | if (sig == TARGET_SIGSEGV) | |
706 | ka->sa._sa_handler = TARGET_SIG_DFL; | |
707 | force_sig(TARGET_SIGSEGV /* , current */); | |
708 | } | |
709 | ||
710 | static int | |
711 | restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax) | |
712 | { | |
713 | unsigned int err = 0; | |
714 | ||
715 | ||
716 | ||
717 | #define COPY(x) err |= __get_user(regs->x, &sc->x) | |
718 | ||
719 | #define COPY_SEG(seg) \ | |
720 | { unsigned short tmp; \ | |
721 | err |= __get_user(tmp, &sc->seg); \ | |
722 | regs->x##seg = tmp; } | |
723 | ||
724 | #define COPY_SEG_STRICT(seg) \ | |
725 | { unsigned short tmp; \ | |
726 | err |= __get_user(tmp, &sc->seg); \ | |
727 | regs->x##seg = tmp|3; } | |
728 | ||
729 | #define GET_SEG(seg) \ | |
730 | { unsigned short tmp; \ | |
731 | err |= __get_user(tmp, &sc->seg); \ | |
732 | loadsegment(seg,tmp); } | |
733 | ||
734 | cpu_x86_load_seg(env, R_GS, lduw(&sc->gs)); | |
735 | cpu_x86_load_seg(env, R_FS, lduw(&sc->fs)); | |
736 | cpu_x86_load_seg(env, R_ES, lduw(&sc->es)); | |
737 | cpu_x86_load_seg(env, R_DS, lduw(&sc->ds)); | |
738 | ||
739 | env->regs[R_EDI] = ldl(&sc->edi); | |
740 | env->regs[R_ESI] = ldl(&sc->esi); | |
741 | env->regs[R_EBP] = ldl(&sc->ebp); | |
742 | env->regs[R_ESP] = ldl(&sc->esp); | |
743 | env->regs[R_EBX] = ldl(&sc->ebx); | |
744 | env->regs[R_EDX] = ldl(&sc->edx); | |
745 | env->regs[R_ECX] = ldl(&sc->ecx); | |
746 | env->eip = ldl(&sc->eip); | |
747 | ||
748 | cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3); | |
749 | cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3); | |
750 | ||
751 | { | |
752 | unsigned int tmpflags; | |
753 | tmpflags = ldl(&sc->eflags); | |
754 | env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); | |
755 | // regs->orig_eax = -1; /* disable syscall checks */ | |
756 | } | |
757 | ||
758 | #if 0 | |
759 | { | |
760 | struct _fpstate * buf; | |
761 | err |= __get_user(buf, &sc->fpstate); | |
762 | if (buf) { | |
763 | if (verify_area(VERIFY_READ, buf, sizeof(*buf))) | |
764 | goto badframe; | |
765 | err |= restore_i387(buf); | |
766 | } | |
767 | } | |
768 | #endif | |
769 | *peax = ldl(&sc->eax); | |
770 | return err; | |
771 | #if 0 | |
772 | badframe: | |
773 | return 1; | |
774 | #endif | |
775 | } | |
776 | ||
777 | long do_sigreturn(CPUX86State *env) | |
778 | { | |
779 | struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8); | |
780 | target_sigset_t target_set; | |
781 | sigset_t set; | |
782 | int eax, i; | |
783 | ||
784 | /* set blocked signals */ | |
785 | target_set.sig[0] = frame->sc.oldmask; | |
786 | for(i = 1; i < TARGET_NSIG_WORDS; i++) | |
787 | target_set.sig[i] = frame->extramask[i - 1]; | |
788 | ||
789 | target_to_host_sigset(&set, &target_set); | |
790 | sigprocmask(SIG_SETMASK, &set, NULL); | |
791 | ||
792 | /* restore registers */ | |
793 | if (restore_sigcontext(env, &frame->sc, &eax)) | |
794 | goto badframe; | |
795 | return eax; | |
796 | ||
797 | badframe: | |
798 | force_sig(TARGET_SIGSEGV); | |
799 | return 0; | |
800 | } | |
801 | ||
802 | long do_rt_sigreturn(CPUX86State *env) | |
803 | { | |
804 | struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4); | |
805 | target_sigset_t target_set; | |
806 | sigset_t set; | |
807 | // stack_t st; | |
808 | int eax; | |
809 | ||
810 | #if 0 | |
811 | if (verify_area(VERIFY_READ, frame, sizeof(*frame))) | |
812 | goto badframe; | |
813 | #endif | |
814 | memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t)); | |
815 | ||
816 | target_to_host_sigset(&set, &target_set); | |
817 | sigprocmask(SIG_SETMASK, &set, NULL); | |
818 | ||
819 | if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax)) | |
820 | goto badframe; | |
821 | ||
822 | #if 0 | |
823 | if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) | |
824 | goto badframe; | |
825 | /* It is more difficult to avoid calling this function than to | |
826 | call it and ignore errors. */ | |
827 | do_sigaltstack(&st, NULL, regs->esp); | |
828 | #endif | |
829 | return eax; | |
830 | ||
831 | badframe: | |
832 | force_sig(TARGET_SIGSEGV); | |
833 | return 0; | |
834 | } | |
835 | ||
836 | #endif | |
837 | ||
838 | void process_pending_signals(void *cpu_env) | |
839 | { | |
840 | int sig; | |
841 | target_ulong handler; | |
9de5e440 FB |
842 | sigset_t set, old_set; |
843 | target_sigset_t target_old_set; | |
66fb9763 FB |
844 | struct emulated_sigaction *k; |
845 | struct sigqueue *q; | |
846 | ||
31e31b8a FB |
847 | if (!signal_pending) |
848 | return; | |
849 | ||
66fb9763 FB |
850 | k = sigact_table; |
851 | for(sig = 1; sig <= TARGET_NSIG; sig++) { | |
852 | if (k->pending) | |
31e31b8a | 853 | goto handle_signal; |
66fb9763 | 854 | k++; |
31e31b8a FB |
855 | } |
856 | /* if no signal is pending, just return */ | |
857 | signal_pending = 0; | |
858 | return; | |
66fb9763 | 859 | |
31e31b8a | 860 | handle_signal: |
66fb9763 | 861 | #ifdef DEBUG_SIGNAL |
bc8a22cc | 862 | fprintf(stderr, "qemu: process signal %d\n", sig); |
66fb9763 FB |
863 | #endif |
864 | /* dequeue signal */ | |
865 | q = k->first; | |
866 | k->first = q->next; | |
867 | if (!k->first) | |
868 | k->pending = 0; | |
869 | ||
870 | handler = k->sa._sa_handler; | |
871 | if (handler == TARGET_SIG_DFL) { | |
872 | /* default handler : ignore some signal. The other are fatal */ | |
873 | if (sig != TARGET_SIGCHLD && | |
874 | sig != TARGET_SIGURG && | |
875 | sig != TARGET_SIGWINCH) { | |
876 | force_sig(sig); | |
877 | } | |
878 | } else if (handler == TARGET_SIG_IGN) { | |
879 | /* ignore sig */ | |
880 | } else if (handler == TARGET_SIG_ERR) { | |
881 | force_sig(sig); | |
882 | } else { | |
9de5e440 FB |
883 | /* compute the blocked signals during the handler execution */ |
884 | target_to_host_sigset(&set, &k->sa.sa_mask); | |
885 | /* SA_NODEFER indicates that the current signal should not be | |
886 | blocked during the handler */ | |
887 | if (!(k->sa.sa_flags & TARGET_SA_NODEFER)) | |
888 | sigaddset(&set, target_to_host_signal(sig)); | |
889 | ||
890 | /* block signals in the handler using Linux */ | |
891 | sigprocmask(SIG_BLOCK, &set, &old_set); | |
892 | /* save the previous blocked signal state to restore it at the | |
893 | end of the signal execution (see do_sigreturn) */ | |
894 | host_to_target_sigset(&target_old_set, &old_set); | |
895 | ||
bc8a22cc FB |
896 | /* if the CPU is in VM86 mode, we restore the 32 bit values */ |
897 | #ifdef TARGET_I386 | |
898 | { | |
899 | CPUX86State *env = cpu_env; | |
900 | if (env->eflags & VM_MASK) | |
901 | save_v86_state(env); | |
902 | } | |
903 | #endif | |
9de5e440 | 904 | /* prepare the stack frame of the virtual CPU */ |
66fb9763 | 905 | if (k->sa.sa_flags & TARGET_SA_SIGINFO) |
9de5e440 | 906 | setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env); |
66fb9763 | 907 | else |
9de5e440 | 908 | setup_frame(sig, k, &target_old_set, cpu_env); |
66fb9763 FB |
909 | if (k->sa.sa_flags & TARGET_SA_RESETHAND) |
910 | k->sa._sa_handler = TARGET_SIG_DFL; | |
31e31b8a | 911 | } |
66fb9763 FB |
912 | if (q != &k->info) |
913 | free_sigqueue(q); | |
914 | } | |
31e31b8a FB |
915 | |
916 |