root / linux-user / signal.c @ 2a29ca73
History | View | Annotate | Download (24.9 kB)
1 |
/*
|
---|---|
2 |
* Emulation of Linux signals
|
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> |
22 |
#include <string.h> |
23 |
#include <stdarg.h> |
24 |
#include <unistd.h> |
25 |
#include <signal.h> |
26 |
#include <errno.h> |
27 |
#include <sys/ucontext.h> |
28 |
|
29 |
#ifdef __ia64__
|
30 |
#undef uc_mcontext
|
31 |
#undef uc_sigmask
|
32 |
#undef uc_stack
|
33 |
#undef uc_link
|
34 |
#endif
|
35 |
|
36 |
#include "qemu.h" |
37 |
|
38 |
//#define DEBUG_SIGNAL
|
39 |
|
40 |
#define MAX_SIGQUEUE_SIZE 1024 |
41 |
|
42 |
struct sigqueue {
|
43 |
struct sigqueue *next;
|
44 |
target_siginfo_t info; |
45 |
}; |
46 |
|
47 |
struct emulated_sigaction {
|
48 |
struct target_sigaction sa;
|
49 |
int pending; /* true if signal is pending */ |
50 |
struct sigqueue *first;
|
51 |
struct sigqueue info; /* in order to always have memory for the |
52 |
first signal, we put it here */
|
53 |
}; |
54 |
|
55 |
static struct emulated_sigaction sigact_table[TARGET_NSIG]; |
56 |
static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */ |
57 |
static struct sigqueue *first_free; /* first free siginfo queue entry */ |
58 |
static int signal_pending; /* non zero if a signal may be pending */ |
59 |
|
60 |
static void host_signal_handler(int host_signum, siginfo_t *info, |
61 |
void *puc);
|
62 |
|
63 |
/* XXX: do it properly */
|
64 |
static inline int host_to_target_signal(int sig) |
65 |
{ |
66 |
return sig;
|
67 |
} |
68 |
|
69 |
static inline int target_to_host_signal(int sig) |
70 |
{ |
71 |
return sig;
|
72 |
} |
73 |
|
74 |
void host_to_target_sigset(target_sigset_t *d, sigset_t *s)
|
75 |
{ |
76 |
int i;
|
77 |
for(i = 0;i < TARGET_NSIG_WORDS; i++) { |
78 |
d->sig[i] = tswapl(((unsigned long *)s)[i]); |
79 |
} |
80 |
} |
81 |
|
82 |
void target_to_host_sigset(sigset_t *d, target_sigset_t *s)
|
83 |
{ |
84 |
int i;
|
85 |
for(i = 0;i < TARGET_NSIG_WORDS; i++) { |
86 |
((unsigned long *)d)[i] = tswapl(s->sig[i]); |
87 |
} |
88 |
} |
89 |
|
90 |
void host_to_target_old_sigset(target_ulong *old_sigset,
|
91 |
const sigset_t *sigset)
|
92 |
{ |
93 |
*old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff); |
94 |
} |
95 |
|
96 |
void target_to_host_old_sigset(sigset_t *sigset,
|
97 |
const target_ulong *old_sigset)
|
98 |
{ |
99 |
sigemptyset(sigset); |
100 |
*(unsigned long *)sigset = tswapl(*old_sigset); |
101 |
} |
102 |
|
103 |
/* siginfo conversion */
|
104 |
|
105 |
static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, |
106 |
const siginfo_t *info)
|
107 |
{ |
108 |
int sig;
|
109 |
sig = host_to_target_signal(info->si_signo); |
110 |
tinfo->si_signo = sig; |
111 |
tinfo->si_errno = 0;
|
112 |
tinfo->si_code = 0;
|
113 |
if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
|
114 |
sig == SIGBUS || sig == SIGTRAP) { |
115 |
/* should never come here, but who knows. The information for
|
116 |
the target is irrelevant */
|
117 |
tinfo->_sifields._sigfault._addr = 0;
|
118 |
} else if (sig >= TARGET_SIGRTMIN) { |
119 |
tinfo->_sifields._rt._pid = info->si_pid; |
120 |
tinfo->_sifields._rt._uid = info->si_uid; |
121 |
/* XXX: potential problem if 64 bit */
|
122 |
tinfo->_sifields._rt._sigval.sival_ptr = |
123 |
(target_ulong)info->si_value.sival_ptr; |
124 |
} |
125 |
} |
126 |
|
127 |
static void tswap_siginfo(target_siginfo_t *tinfo, |
128 |
const target_siginfo_t *info)
|
129 |
{ |
130 |
int sig;
|
131 |
sig = info->si_signo; |
132 |
tinfo->si_signo = tswap32(sig); |
133 |
tinfo->si_errno = tswap32(info->si_errno); |
134 |
tinfo->si_code = tswap32(info->si_code); |
135 |
if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV ||
|
136 |
sig == SIGBUS || sig == SIGTRAP) { |
137 |
tinfo->_sifields._sigfault._addr = |
138 |
tswapl(info->_sifields._sigfault._addr); |
139 |
} else if (sig >= TARGET_SIGRTMIN) { |
140 |
tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid); |
141 |
tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid); |
142 |
tinfo->_sifields._rt._sigval.sival_ptr = |
143 |
tswapl(info->_sifields._rt._sigval.sival_ptr); |
144 |
} |
145 |
} |
146 |
|
147 |
|
148 |
void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info) |
149 |
{ |
150 |
host_to_target_siginfo_noswap(tinfo, info); |
151 |
tswap_siginfo(tinfo, tinfo); |
152 |
} |
153 |
|
154 |
/* XXX: we support only POSIX RT signals are used. */
|
155 |
/* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
|
156 |
void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo) |
157 |
{ |
158 |
info->si_signo = tswap32(tinfo->si_signo); |
159 |
info->si_errno = tswap32(tinfo->si_errno); |
160 |
info->si_code = tswap32(tinfo->si_code); |
161 |
info->si_pid = tswap32(tinfo->_sifields._rt._pid); |
162 |
info->si_uid = tswap32(tinfo->_sifields._rt._uid); |
163 |
info->si_value.sival_ptr = |
164 |
(void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
|
165 |
} |
166 |
|
167 |
void signal_init(void) |
168 |
{ |
169 |
struct sigaction act;
|
170 |
int i;
|
171 |
|
172 |
/* set all host signal handlers. ALL signals are blocked during
|
173 |
the handlers to serialize them. */
|
174 |
sigfillset(&act.sa_mask); |
175 |
act.sa_flags = SA_SIGINFO; |
176 |
act.sa_sigaction = host_signal_handler; |
177 |
for(i = 1; i < NSIG; i++) { |
178 |
sigaction(i, &act, NULL);
|
179 |
} |
180 |
|
181 |
memset(sigact_table, 0, sizeof(sigact_table)); |
182 |
|
183 |
first_free = &sigqueue_table[0];
|
184 |
for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) |
185 |
sigqueue_table[i].next = &sigqueue_table[i + 1];
|
186 |
sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL; |
187 |
} |
188 |
|
189 |
/* signal queue handling */
|
190 |
|
191 |
static inline struct sigqueue *alloc_sigqueue(void) |
192 |
{ |
193 |
struct sigqueue *q = first_free;
|
194 |
if (!q)
|
195 |
return NULL; |
196 |
first_free = q->next; |
197 |
return q;
|
198 |
} |
199 |
|
200 |
static inline void free_sigqueue(struct sigqueue *q) |
201 |
{ |
202 |
q->next = first_free; |
203 |
first_free = q; |
204 |
} |
205 |
|
206 |
/* abort execution with signal */
|
207 |
void __attribute((noreturn)) force_sig(int sig) |
208 |
{ |
209 |
int host_sig;
|
210 |
host_sig = target_to_host_signal(sig); |
211 |
fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
|
212 |
sig, strsignal(host_sig)); |
213 |
#if 1 |
214 |
_exit(-host_sig); |
215 |
#else
|
216 |
{ |
217 |
struct sigaction act;
|
218 |
sigemptyset(&act.sa_mask); |
219 |
act.sa_flags = SA_SIGINFO; |
220 |
act.sa_sigaction = SIG_DFL; |
221 |
sigaction(SIGABRT, &act, NULL);
|
222 |
abort(); |
223 |
} |
224 |
#endif
|
225 |
} |
226 |
|
227 |
/* queue a signal so that it will be send to the virtual CPU as soon
|
228 |
as possible */
|
229 |
int queue_signal(int sig, target_siginfo_t *info) |
230 |
{ |
231 |
struct emulated_sigaction *k;
|
232 |
struct sigqueue *q, **pq;
|
233 |
target_ulong handler; |
234 |
|
235 |
#if defined(DEBUG_SIGNAL)
|
236 |
fprintf(stderr, "queue_signal: sig=%d\n",
|
237 |
sig); |
238 |
#endif
|
239 |
k = &sigact_table[sig - 1];
|
240 |
handler = k->sa._sa_handler; |
241 |
if (handler == TARGET_SIG_DFL) {
|
242 |
/* default handler : ignore some signal. The other are fatal */
|
243 |
if (sig != TARGET_SIGCHLD &&
|
244 |
sig != TARGET_SIGURG && |
245 |
sig != TARGET_SIGWINCH) { |
246 |
force_sig(sig); |
247 |
} else {
|
248 |
return 0; /* indicate ignored */ |
249 |
} |
250 |
} else if (handler == TARGET_SIG_IGN) { |
251 |
/* ignore signal */
|
252 |
return 0; |
253 |
} else if (handler == TARGET_SIG_ERR) { |
254 |
force_sig(sig); |
255 |
} else {
|
256 |
pq = &k->first; |
257 |
if (sig < TARGET_SIGRTMIN) {
|
258 |
/* if non real time signal, we queue exactly one signal */
|
259 |
if (!k->pending)
|
260 |
q = &k->info; |
261 |
else
|
262 |
return 0; |
263 |
} else {
|
264 |
if (!k->pending) {
|
265 |
/* first signal */
|
266 |
q = &k->info; |
267 |
} else {
|
268 |
q = alloc_sigqueue(); |
269 |
if (!q)
|
270 |
return -EAGAIN;
|
271 |
while (*pq != NULL) |
272 |
pq = &(*pq)->next; |
273 |
} |
274 |
} |
275 |
*pq = q; |
276 |
q->info = *info; |
277 |
q->next = NULL;
|
278 |
k->pending = 1;
|
279 |
/* signal that a new signal is pending */
|
280 |
signal_pending = 1;
|
281 |
return 1; /* indicates that the signal was queued */ |
282 |
} |
283 |
} |
284 |
|
285 |
#if defined(DEBUG_SIGNAL)
|
286 |
#ifdef __i386__
|
287 |
static void dump_regs(struct ucontext *uc) |
288 |
{ |
289 |
fprintf(stderr, |
290 |
"EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
|
291 |
"ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
|
292 |
"EFL=%08x EIP=%08x\n",
|
293 |
uc->uc_mcontext.gregs[EAX], |
294 |
uc->uc_mcontext.gregs[EBX], |
295 |
uc->uc_mcontext.gregs[ECX], |
296 |
uc->uc_mcontext.gregs[EDX], |
297 |
uc->uc_mcontext.gregs[ESI], |
298 |
uc->uc_mcontext.gregs[EDI], |
299 |
uc->uc_mcontext.gregs[EBP], |
300 |
uc->uc_mcontext.gregs[ESP], |
301 |
uc->uc_mcontext.gregs[EFL], |
302 |
uc->uc_mcontext.gregs[EIP]); |
303 |
} |
304 |
#else
|
305 |
static void dump_regs(struct ucontext *uc) |
306 |
{ |
307 |
} |
308 |
#endif
|
309 |
|
310 |
#endif
|
311 |
|
312 |
static void host_signal_handler(int host_signum, siginfo_t *info, |
313 |
void *puc)
|
314 |
{ |
315 |
int sig;
|
316 |
target_siginfo_t tinfo; |
317 |
|
318 |
/* the CPU emulator uses some host signals to detect exceptions,
|
319 |
we we forward to it some signals */
|
320 |
if (host_signum == SIGSEGV || host_signum == SIGBUS) {
|
321 |
if (cpu_x86_signal_handler(host_signum, info, puc))
|
322 |
return;
|
323 |
} |
324 |
|
325 |
/* get target signal number */
|
326 |
sig = host_to_target_signal(host_signum); |
327 |
if (sig < 1 || sig > TARGET_NSIG) |
328 |
return;
|
329 |
#if defined(DEBUG_SIGNAL)
|
330 |
fprintf(stderr, "qemu: got signal %d\n", sig);
|
331 |
dump_regs(puc); |
332 |
#endif
|
333 |
host_to_target_siginfo_noswap(&tinfo, info); |
334 |
if (queue_signal(sig, &tinfo) == 1) { |
335 |
/* interrupt the virtual CPU as soon as possible */
|
336 |
cpu_x86_interrupt(global_env); |
337 |
} |
338 |
} |
339 |
|
340 |
int do_sigaction(int sig, const struct target_sigaction *act, |
341 |
struct target_sigaction *oact)
|
342 |
{ |
343 |
struct emulated_sigaction *k;
|
344 |
|
345 |
if (sig < 1 || sig > TARGET_NSIG) |
346 |
return -EINVAL;
|
347 |
k = &sigact_table[sig - 1];
|
348 |
#if defined(DEBUG_SIGNAL) && 0 |
349 |
fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
|
350 |
sig, (int)act, (int)oact); |
351 |
#endif
|
352 |
if (oact) {
|
353 |
oact->_sa_handler = tswapl(k->sa._sa_handler); |
354 |
oact->sa_flags = tswapl(k->sa.sa_flags); |
355 |
oact->sa_restorer = tswapl(k->sa.sa_restorer); |
356 |
oact->sa_mask = k->sa.sa_mask; |
357 |
} |
358 |
if (act) {
|
359 |
k->sa._sa_handler = tswapl(act->_sa_handler); |
360 |
k->sa.sa_flags = tswapl(act->sa_flags); |
361 |
k->sa.sa_restorer = tswapl(act->sa_restorer); |
362 |
k->sa.sa_mask = act->sa_mask; |
363 |
} |
364 |
return 0; |
365 |
} |
366 |
|
367 |
#ifdef TARGET_I386
|
368 |
|
369 |
/* from the Linux kernel */
|
370 |
|
371 |
struct target_fpreg {
|
372 |
uint16_t significand[4];
|
373 |
uint16_t exponent; |
374 |
}; |
375 |
|
376 |
struct target_fpxreg {
|
377 |
uint16_t significand[4];
|
378 |
uint16_t exponent; |
379 |
uint16_t padding[3];
|
380 |
}; |
381 |
|
382 |
struct target_xmmreg {
|
383 |
target_ulong element[4];
|
384 |
}; |
385 |
|
386 |
struct target_fpstate {
|
387 |
/* Regular FPU environment */
|
388 |
target_ulong cw; |
389 |
target_ulong sw; |
390 |
target_ulong tag; |
391 |
target_ulong ipoff; |
392 |
target_ulong cssel; |
393 |
target_ulong dataoff; |
394 |
target_ulong datasel; |
395 |
struct target_fpreg _st[8]; |
396 |
uint16_t status; |
397 |
uint16_t magic; /* 0xffff = regular FPU data only */
|
398 |
|
399 |
/* FXSR FPU environment */
|
400 |
target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ |
401 |
target_ulong mxcsr; |
402 |
target_ulong reserved; |
403 |
struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ |
404 |
struct target_xmmreg _xmm[8]; |
405 |
target_ulong padding[56];
|
406 |
}; |
407 |
|
408 |
#define X86_FXSR_MAGIC 0x0000 |
409 |
|
410 |
struct target_sigcontext {
|
411 |
uint16_t gs, __gsh; |
412 |
uint16_t fs, __fsh; |
413 |
uint16_t es, __esh; |
414 |
uint16_t ds, __dsh; |
415 |
target_ulong edi; |
416 |
target_ulong esi; |
417 |
target_ulong ebp; |
418 |
target_ulong esp; |
419 |
target_ulong ebx; |
420 |
target_ulong edx; |
421 |
target_ulong ecx; |
422 |
target_ulong eax; |
423 |
target_ulong trapno; |
424 |
target_ulong err; |
425 |
target_ulong eip; |
426 |
uint16_t cs, __csh; |
427 |
target_ulong eflags; |
428 |
target_ulong esp_at_signal; |
429 |
uint16_t ss, __ssh; |
430 |
target_ulong fpstate; /* pointer */
|
431 |
target_ulong oldmask; |
432 |
target_ulong cr2; |
433 |
}; |
434 |
|
435 |
typedef struct target_sigaltstack { |
436 |
target_ulong ss_sp; |
437 |
int ss_flags;
|
438 |
target_ulong ss_size; |
439 |
} target_stack_t; |
440 |
|
441 |
struct target_ucontext {
|
442 |
target_ulong uc_flags; |
443 |
target_ulong uc_link; |
444 |
target_stack_t uc_stack; |
445 |
struct target_sigcontext uc_mcontext;
|
446 |
target_sigset_t uc_sigmask; /* mask last for extensibility */
|
447 |
}; |
448 |
|
449 |
struct sigframe
|
450 |
{ |
451 |
target_ulong pretcode; |
452 |
int sig;
|
453 |
struct target_sigcontext sc;
|
454 |
struct target_fpstate fpstate;
|
455 |
target_ulong extramask[TARGET_NSIG_WORDS-1];
|
456 |
char retcode[8]; |
457 |
}; |
458 |
|
459 |
struct rt_sigframe
|
460 |
{ |
461 |
target_ulong pretcode; |
462 |
int sig;
|
463 |
target_ulong pinfo; |
464 |
target_ulong puc; |
465 |
struct target_siginfo info;
|
466 |
struct target_ucontext uc;
|
467 |
struct target_fpstate fpstate;
|
468 |
char retcode[8]; |
469 |
}; |
470 |
|
471 |
/*
|
472 |
* Set up a signal frame.
|
473 |
*/
|
474 |
|
475 |
#define __put_user(x,ptr)\
|
476 |
({\ |
477 |
int size = sizeof(*ptr);\ |
478 |
switch(size) {\
|
479 |
case 1:\ |
480 |
stb(ptr, (typeof(*ptr))(x));\ |
481 |
break;\
|
482 |
case 2:\ |
483 |
stw(ptr, (typeof(*ptr))(x));\ |
484 |
break;\
|
485 |
case 4:\ |
486 |
stl(ptr, (typeof(*ptr))(x));\ |
487 |
break;\
|
488 |
case 8:\ |
489 |
stq(ptr, (typeof(*ptr))(x));\ |
490 |
break;\
|
491 |
default:\
|
492 |
abort();\ |
493 |
}\ |
494 |
0;\
|
495 |
}) |
496 |
|
497 |
#define get_user(val, ptr) (typeof(*ptr))(*(ptr))
|
498 |
|
499 |
|
500 |
#define __copy_to_user(dst, src, size)\
|
501 |
({\ |
502 |
memcpy(dst, src, size);\ |
503 |
0;\
|
504 |
}) |
505 |
|
506 |
static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, |
507 |
const target_siginfo_t *info)
|
508 |
{ |
509 |
tswap_siginfo(tinfo, info); |
510 |
return 0; |
511 |
} |
512 |
|
513 |
/* XXX: save x87 state */
|
514 |
static int |
515 |
setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, |
516 |
CPUX86State *env, unsigned long mask) |
517 |
{ |
518 |
int err = 0; |
519 |
|
520 |
err |= __put_user(env->segs[R_GS], (unsigned int *)&sc->gs); |
521 |
err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs); |
522 |
err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es); |
523 |
err |= __put_user(env->segs[R_DS], (unsigned int *)&sc->ds); |
524 |
err |= __put_user(env->regs[R_EDI], &sc->edi); |
525 |
err |= __put_user(env->regs[R_ESI], &sc->esi); |
526 |
err |= __put_user(env->regs[R_EBP], &sc->ebp); |
527 |
err |= __put_user(env->regs[R_ESP], &sc->esp); |
528 |
err |= __put_user(env->regs[R_EBX], &sc->ebx); |
529 |
err |= __put_user(env->regs[R_EDX], &sc->edx); |
530 |
err |= __put_user(env->regs[R_ECX], &sc->ecx); |
531 |
err |= __put_user(env->regs[R_EAX], &sc->eax); |
532 |
err |= __put_user(env->exception_index, &sc->trapno); |
533 |
err |= __put_user(env->error_code, &sc->err); |
534 |
err |= __put_user(env->eip, &sc->eip); |
535 |
err |= __put_user(env->segs[R_CS], (unsigned int *)&sc->cs); |
536 |
err |= __put_user(env->eflags, &sc->eflags); |
537 |
err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal); |
538 |
err |= __put_user(env->segs[R_SS], (unsigned int *)&sc->ss); |
539 |
#if 0
|
540 |
tmp = save_i387(fpstate);
|
541 |
if (tmp < 0)
|
542 |
err = 1;
|
543 |
else
|
544 |
err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
|
545 |
#else
|
546 |
err |= __put_user(0, &sc->fpstate);
|
547 |
#endif
|
548 |
/* non-iBCS2 extensions.. */
|
549 |
err |= __put_user(mask, &sc->oldmask); |
550 |
err |= __put_user(/*current->thread.cr2*/ 0, &sc->cr2); |
551 |
return err;
|
552 |
} |
553 |
|
554 |
/*
|
555 |
* Determine which stack to use..
|
556 |
*/
|
557 |
|
558 |
static inline void * |
559 |
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
|
560 |
{ |
561 |
unsigned long esp; |
562 |
|
563 |
/* Default to using normal stack */
|
564 |
esp = env->regs[R_ESP]; |
565 |
#if 0
|
566 |
/* This is the X/Open sanctioned signal stack switching. */
|
567 |
if (ka->sa.sa_flags & SA_ONSTACK) {
|
568 |
if (sas_ss_flags(esp) == 0)
|
569 |
esp = current->sas_ss_sp + current->sas_ss_size;
|
570 |
}
|
571 |
|
572 |
/* This is the legacy signal stack switching. */
|
573 |
else if ((regs->xss & 0xffff) != __USER_DS &&
|
574 |
!(ka->sa.sa_flags & SA_RESTORER) &&
|
575 |
ka->sa.sa_restorer) {
|
576 |
esp = (unsigned long) ka->sa.sa_restorer;
|
577 |
}
|
578 |
#endif
|
579 |
return (void *)((esp - frame_size) & -8ul); |
580 |
} |
581 |
|
582 |
static void setup_frame(int sig, struct emulated_sigaction *ka, |
583 |
target_sigset_t *set, CPUX86State *env) |
584 |
{ |
585 |
struct sigframe *frame;
|
586 |
int err = 0; |
587 |
|
588 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
589 |
|
590 |
#if 0
|
591 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
592 |
goto give_sigsegv;
|
593 |
#endif
|
594 |
err |= __put_user((/*current->exec_domain
|
595 |
&& current->exec_domain->signal_invmap
|
596 |
&& sig < 32
|
597 |
? current->exec_domain->signal_invmap[sig]
|
598 |
: */ sig),
|
599 |
&frame->sig); |
600 |
if (err)
|
601 |
goto give_sigsegv;
|
602 |
|
603 |
setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
|
604 |
if (err)
|
605 |
goto give_sigsegv;
|
606 |
|
607 |
if (TARGET_NSIG_WORDS > 1) { |
608 |
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
609 |
sizeof(frame->extramask));
|
610 |
} |
611 |
if (err)
|
612 |
goto give_sigsegv;
|
613 |
|
614 |
/* Set up to return from userspace. If provided, use a stub
|
615 |
already in userspace. */
|
616 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
617 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
618 |
} else {
|
619 |
err |= __put_user(frame->retcode, &frame->pretcode); |
620 |
/* This is popl %eax ; movl $,%eax ; int $0x80 */
|
621 |
err |= __put_user(0xb858, (short *)(frame->retcode+0)); |
622 |
err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2)); |
623 |
err |= __put_user(0x80cd, (short *)(frame->retcode+6)); |
624 |
} |
625 |
|
626 |
if (err)
|
627 |
goto give_sigsegv;
|
628 |
|
629 |
/* Set up registers for signal handler */
|
630 |
env->regs[R_ESP] = (unsigned long) frame; |
631 |
env->eip = (unsigned long) ka->sa._sa_handler; |
632 |
|
633 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
634 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
635 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
636 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
637 |
env->eflags &= ~TF_MASK; |
638 |
|
639 |
return;
|
640 |
|
641 |
give_sigsegv:
|
642 |
if (sig == TARGET_SIGSEGV)
|
643 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
644 |
force_sig(TARGET_SIGSEGV /* , current */);
|
645 |
} |
646 |
|
647 |
static void setup_rt_frame(int sig, struct emulated_sigaction *ka, |
648 |
target_siginfo_t *info, |
649 |
target_sigset_t *set, CPUX86State *env) |
650 |
{ |
651 |
struct rt_sigframe *frame;
|
652 |
int err = 0; |
653 |
|
654 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
655 |
|
656 |
#if 0
|
657 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
658 |
goto give_sigsegv;
|
659 |
#endif
|
660 |
|
661 |
err |= __put_user((/*current->exec_domain
|
662 |
&& current->exec_domain->signal_invmap
|
663 |
&& sig < 32
|
664 |
? current->exec_domain->signal_invmap[sig]
|
665 |
: */sig),
|
666 |
&frame->sig); |
667 |
err |= __put_user((target_ulong)&frame->info, &frame->pinfo); |
668 |
err |= __put_user((target_ulong)&frame->uc, &frame->puc); |
669 |
err |= copy_siginfo_to_user(&frame->info, info); |
670 |
if (err)
|
671 |
goto give_sigsegv;
|
672 |
|
673 |
/* Create the ucontext. */
|
674 |
err |= __put_user(0, &frame->uc.uc_flags);
|
675 |
err |= __put_user(0, &frame->uc.uc_link);
|
676 |
err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp); |
677 |
err |= __put_user(/* sas_ss_flags(regs->esp) */ 0, |
678 |
&frame->uc.uc_stack.ss_flags); |
679 |
err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size); |
680 |
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, |
681 |
env, set->sig[0]);
|
682 |
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
683 |
if (err)
|
684 |
goto give_sigsegv;
|
685 |
|
686 |
/* Set up to return from userspace. If provided, use a stub
|
687 |
already in userspace. */
|
688 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
689 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
690 |
} else {
|
691 |
err |= __put_user(frame->retcode, &frame->pretcode); |
692 |
/* This is movl $,%eax ; int $0x80 */
|
693 |
err |= __put_user(0xb8, (char *)(frame->retcode+0)); |
694 |
err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1)); |
695 |
err |= __put_user(0x80cd, (short *)(frame->retcode+5)); |
696 |
} |
697 |
|
698 |
if (err)
|
699 |
goto give_sigsegv;
|
700 |
|
701 |
/* Set up registers for signal handler */
|
702 |
env->regs[R_ESP] = (unsigned long) frame; |
703 |
env->eip = (unsigned long) ka->sa._sa_handler; |
704 |
|
705 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
706 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
707 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
708 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
709 |
env->eflags &= ~TF_MASK; |
710 |
|
711 |
return;
|
712 |
|
713 |
give_sigsegv:
|
714 |
if (sig == TARGET_SIGSEGV)
|
715 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
716 |
force_sig(TARGET_SIGSEGV /* , current */);
|
717 |
} |
718 |
|
719 |
static int |
720 |
restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax) |
721 |
{ |
722 |
unsigned int err = 0; |
723 |
|
724 |
|
725 |
|
726 |
#define COPY(x) err |= __get_user(regs->x, &sc->x)
|
727 |
|
728 |
#define COPY_SEG(seg) \
|
729 |
{ unsigned short tmp; \ |
730 |
err |= __get_user(tmp, &sc->seg); \ |
731 |
regs->x##seg = tmp; } |
732 |
|
733 |
#define COPY_SEG_STRICT(seg) \
|
734 |
{ unsigned short tmp; \ |
735 |
err |= __get_user(tmp, &sc->seg); \ |
736 |
regs->x##seg = tmp|3; } |
737 |
|
738 |
#define GET_SEG(seg) \
|
739 |
{ unsigned short tmp; \ |
740 |
err |= __get_user(tmp, &sc->seg); \ |
741 |
loadsegment(seg,tmp); } |
742 |
|
743 |
cpu_x86_load_seg(env, R_GS, lduw(&sc->gs)); |
744 |
cpu_x86_load_seg(env, R_FS, lduw(&sc->fs)); |
745 |
cpu_x86_load_seg(env, R_ES, lduw(&sc->es)); |
746 |
cpu_x86_load_seg(env, R_DS, lduw(&sc->ds)); |
747 |
|
748 |
env->regs[R_EDI] = ldl(&sc->edi); |
749 |
env->regs[R_ESI] = ldl(&sc->esi); |
750 |
env->regs[R_EBP] = ldl(&sc->ebp); |
751 |
env->regs[R_ESP] = ldl(&sc->esp); |
752 |
env->regs[R_EBX] = ldl(&sc->ebx); |
753 |
env->regs[R_EDX] = ldl(&sc->edx); |
754 |
env->regs[R_ECX] = ldl(&sc->ecx); |
755 |
env->eip = ldl(&sc->eip); |
756 |
|
757 |
cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
|
758 |
cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
|
759 |
|
760 |
{ |
761 |
unsigned int tmpflags; |
762 |
tmpflags = ldl(&sc->eflags); |
763 |
env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); |
764 |
// regs->orig_eax = -1; /* disable syscall checks */
|
765 |
} |
766 |
|
767 |
#if 0
|
768 |
{
|
769 |
struct _fpstate * buf;
|
770 |
err |= __get_user(buf, &sc->fpstate);
|
771 |
if (buf) {
|
772 |
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
|
773 |
goto badframe;
|
774 |
err |= restore_i387(buf);
|
775 |
}
|
776 |
}
|
777 |
#endif
|
778 |
*peax = ldl(&sc->eax); |
779 |
return err;
|
780 |
#if 0
|
781 |
badframe:
|
782 |
return 1;
|
783 |
#endif
|
784 |
} |
785 |
|
786 |
long do_sigreturn(CPUX86State *env)
|
787 |
{ |
788 |
struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8); |
789 |
target_sigset_t target_set; |
790 |
sigset_t set; |
791 |
int eax, i;
|
792 |
|
793 |
#if defined(DEBUG_SIGNAL)
|
794 |
fprintf(stderr, "do_sigreturn\n");
|
795 |
#endif
|
796 |
/* set blocked signals */
|
797 |
target_set.sig[0] = frame->sc.oldmask;
|
798 |
for(i = 1; i < TARGET_NSIG_WORDS; i++) |
799 |
target_set.sig[i] = frame->extramask[i - 1];
|
800 |
|
801 |
target_to_host_sigset(&set, &target_set); |
802 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
803 |
|
804 |
/* restore registers */
|
805 |
if (restore_sigcontext(env, &frame->sc, &eax))
|
806 |
goto badframe;
|
807 |
return eax;
|
808 |
|
809 |
badframe:
|
810 |
force_sig(TARGET_SIGSEGV); |
811 |
return 0; |
812 |
} |
813 |
|
814 |
long do_rt_sigreturn(CPUX86State *env)
|
815 |
{ |
816 |
struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4); |
817 |
target_sigset_t target_set; |
818 |
sigset_t set; |
819 |
// stack_t st;
|
820 |
int eax;
|
821 |
|
822 |
#if 0
|
823 |
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
|
824 |
goto badframe;
|
825 |
#endif
|
826 |
memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
|
827 |
|
828 |
target_to_host_sigset(&set, &target_set); |
829 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
830 |
|
831 |
if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
|
832 |
goto badframe;
|
833 |
|
834 |
#if 0
|
835 |
if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
|
836 |
goto badframe;
|
837 |
/* It is more difficult to avoid calling this function than to
|
838 |
call it and ignore errors. */
|
839 |
do_sigaltstack(&st, NULL, regs->esp);
|
840 |
#endif
|
841 |
return eax;
|
842 |
|
843 |
badframe:
|
844 |
force_sig(TARGET_SIGSEGV); |
845 |
return 0; |
846 |
} |
847 |
|
848 |
#endif
|
849 |
|
850 |
void process_pending_signals(void *cpu_env) |
851 |
{ |
852 |
int sig;
|
853 |
target_ulong handler; |
854 |
sigset_t set, old_set; |
855 |
target_sigset_t target_old_set; |
856 |
struct emulated_sigaction *k;
|
857 |
struct sigqueue *q;
|
858 |
|
859 |
if (!signal_pending)
|
860 |
return;
|
861 |
|
862 |
k = sigact_table; |
863 |
for(sig = 1; sig <= TARGET_NSIG; sig++) { |
864 |
if (k->pending)
|
865 |
goto handle_signal;
|
866 |
k++; |
867 |
} |
868 |
/* if no signal is pending, just return */
|
869 |
signal_pending = 0;
|
870 |
return;
|
871 |
|
872 |
handle_signal:
|
873 |
#ifdef DEBUG_SIGNAL
|
874 |
fprintf(stderr, "qemu: process signal %d\n", sig);
|
875 |
#endif
|
876 |
/* dequeue signal */
|
877 |
q = k->first; |
878 |
k->first = q->next; |
879 |
if (!k->first)
|
880 |
k->pending = 0;
|
881 |
|
882 |
handler = k->sa._sa_handler; |
883 |
if (handler == TARGET_SIG_DFL) {
|
884 |
/* default handler : ignore some signal. The other are fatal */
|
885 |
if (sig != TARGET_SIGCHLD &&
|
886 |
sig != TARGET_SIGURG && |
887 |
sig != TARGET_SIGWINCH) { |
888 |
force_sig(sig); |
889 |
} |
890 |
} else if (handler == TARGET_SIG_IGN) { |
891 |
/* ignore sig */
|
892 |
} else if (handler == TARGET_SIG_ERR) { |
893 |
force_sig(sig); |
894 |
} else {
|
895 |
/* compute the blocked signals during the handler execution */
|
896 |
target_to_host_sigset(&set, &k->sa.sa_mask); |
897 |
/* SA_NODEFER indicates that the current signal should not be
|
898 |
blocked during the handler */
|
899 |
if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
|
900 |
sigaddset(&set, target_to_host_signal(sig)); |
901 |
|
902 |
/* block signals in the handler using Linux */
|
903 |
sigprocmask(SIG_BLOCK, &set, &old_set); |
904 |
/* save the previous blocked signal state to restore it at the
|
905 |
end of the signal execution (see do_sigreturn) */
|
906 |
host_to_target_sigset(&target_old_set, &old_set); |
907 |
|
908 |
/* if the CPU is in VM86 mode, we restore the 32 bit values */
|
909 |
#ifdef TARGET_I386
|
910 |
{ |
911 |
CPUX86State *env = cpu_env; |
912 |
if (env->eflags & VM_MASK)
|
913 |
save_v86_state(env); |
914 |
} |
915 |
#endif
|
916 |
/* prepare the stack frame of the virtual CPU */
|
917 |
if (k->sa.sa_flags & TARGET_SA_SIGINFO)
|
918 |
setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env); |
919 |
else
|
920 |
setup_frame(sig, k, &target_old_set, cpu_env); |
921 |
if (k->sa.sa_flags & TARGET_SA_RESETHAND)
|
922 |
k->sa._sa_handler = TARGET_SIG_DFL; |
923 |
} |
924 |
if (q != &k->info)
|
925 |
free_sigqueue(q); |
926 |
} |
927 |
|
928 |
|