« back to all changes in this revision
Viewing changes to darwin-user/signal.c
- browse files at revision 2323
- compare with another revision
- compare with revision 4650
- download diff
- download tarball
- view history from revision 2323
- Committer: ths
- Date: 2007-01-18 20:06:33 UTC
- Revision ID: git-v1:831b78254cfa752d5e6542542a663468e650bcb3
Darwin userspace emulation, by Pierre d'Herbemont.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2332 c046a42c-6fe2-441c-8c8c-71466251a162
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2332 c046a42c-6fe2-441c-8c8c-71466251a162
added
removed
darwin-user/signal.c
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 <signal.h>
37
38
#include "qemu.h"
39
40
#define DEBUG_SIGNAL
41
42
#define MAX_SIGQUEUE_SIZE 1024
43
44
struct sigqueue {
45
struct sigqueue *next;
46
target_siginfo_t info;
47
};
48
49
struct emulated_sigaction {
50
struct target_sigaction sa;
51
int pending; /* true if signal is pending */
52
struct sigqueue *first;
53
struct sigqueue info; /* in order to always have memory for the
54
first signal, we put it here */
55
};
56
57
struct sigaltstack target_sigaltstack_used = {
58
0, 0, SA_DISABLE
59
};
60
61
static struct emulated_sigaction sigact_table[NSIG];
62
static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
63
static struct sigqueue *first_free; /* first free siginfo queue entry */
64
static int signal_pending; /* non zero if a signal may be pending */
65
66
static void host_signal_handler(int host_signum, siginfo_t *info,
67
void *puc);
68
69
70
static inline int host_to_target_signal(int sig)
71
{
72
return sig;
73
}
74
75
static inline int target_to_host_signal(int sig)
76
{
77
return sig;
78
}
79
80
/* siginfo conversion */
81
82
83
84
void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info)
85
{
86
87
}
88
89
void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo)
90
{
91
92
}
93
94
void signal_init(void)
95
{
96
struct sigaction act;
97
int i;
98
99
/* set all host signal handlers. ALL signals are blocked during
100
the handlers to serialize them. */
101
sigfillset(&act.sa_mask);
102
act.sa_flags = SA_SIGINFO;
103
act.sa_sigaction = host_signal_handler;
104
for(i = 1; i < NSIG; i++) {
105
sigaction(i, &act, NULL);
106
}
107
108
memset(sigact_table, 0, sizeof(sigact_table));
109
110
first_free = &sigqueue_table[0];
111
for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++)
112
sigqueue_table[i].next = &sigqueue_table[i + 1];
113
sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL;
114
}
115
116
/* signal queue handling */
117
118
static inline struct sigqueue *alloc_sigqueue(void)
119
{
120
struct sigqueue *q = first_free;
121
if (!q)
122
return NULL;
123
first_free = q->next;
124
return q;
125
}
126
127
static inline void free_sigqueue(struct sigqueue *q)
128
{
129
q->next = first_free;
130
first_free = q;
131
}
132
133
/* abort execution with signal */
134
void __attribute((noreturn)) force_sig(int sig)
135
{
136
int host_sig;
137
host_sig = target_to_host_signal(sig);
138
fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n",
139
sig, strsignal(host_sig));
140
_exit(-host_sig);
141
}
142
143
/* queue a signal so that it will be send to the virtual CPU as soon
144
as possible */
145
int queue_signal(int sig, target_siginfo_t *info)
146
{
147
struct emulated_sigaction *k;
148
struct sigqueue *q, **pq;
149
target_ulong handler;
150
151
#if defined(DEBUG_SIGNAL)
152
fprintf(stderr, "queue_signal: sig=%d\n",
153
sig);
154
#endif
155
k = &sigact_table[sig - 1];
156
handler = (target_ulong)k->sa.sa_handler;
157
if (handler == SIG_DFL) {
158
/* default handler : ignore some signal. The other are fatal */
159
if (sig != SIGCHLD &&
160
sig != SIGURG &&
161
sig != SIGWINCH) {
162
force_sig(sig);
163
} else {
164
return 0; /* indicate ignored */
165
}
166
} else if (handler == host_to_target_signal(SIG_IGN)) {
167
/* ignore signal */
168
return 0;
169
} else if (handler == host_to_target_signal(SIG_ERR)) {
170
force_sig(sig);
171
} else {
172
pq = &k->first;
173
if (!k->pending) {
174
/* first signal */
175
q = &k->info;
176
} else {
177
q = alloc_sigqueue();
178
if (!q)
179
return -EAGAIN;
180
while (*pq != NULL)
181
pq = &(*pq)->next;
182
}
183
*pq = q;
184
q->info = *info;
185
q->next = NULL;
186
k->pending = 1;
187
/* signal that a new signal is pending */
188
signal_pending = 1;
189
return 1; /* indicates that the signal was queued */
190
}
191
}
192
193
static void host_signal_handler(int host_signum, siginfo_t *info,
194
void *puc)
195
{
196
int sig;
197
target_siginfo_t tinfo;
198
199
/* the CPU emulator uses some host signals to detect exceptions,
200
we we forward to it some signals */
201
if (host_signum == SIGSEGV || host_signum == SIGBUS
202
#if defined(TARGET_I386) && defined(USE_CODE_COPY)
203
|| host_signum == SIGFPE
204
#endif
205
) {
206
if (cpu_signal_handler(host_signum, (void*)info, puc))
207
return;
208
}
209
210
/* get target signal number */
211
sig = host_to_target_signal(host_signum);
212
if (sig < 1 || sig > NSIG)
213
return;
214
215
#if defined(DEBUG_SIGNAL)
216
fprintf(stderr, "qemu: got signal %d\n", sig);
217
#endif
218
if (queue_signal(sig, &tinfo) == 1) {
219
/* interrupt the virtual CPU as soon as possible */
220
cpu_interrupt(global_env, CPU_INTERRUPT_EXIT);
221
}
222
}
223
224
int do_sigaltstack(const struct sigaltstack *ss, struct sigaltstack *oss)
225
{
226
/* XXX: test errors */
227
if(oss)
228
{
229
oss->ss_sp = tswap32(target_sigaltstack_used.ss_sp);
230
oss->ss_size = tswap32(target_sigaltstack_used.ss_size);
231
oss->ss_flags = tswap32(target_sigaltstack_used.ss_flags);
232
}
233
if(ss)
234
{
235
target_sigaltstack_used.ss_sp = tswap32(ss->ss_sp);
236
target_sigaltstack_used.ss_size = tswap32(ss->ss_size);
237
target_sigaltstack_used.ss_flags = tswap32(ss->ss_flags);
238
}
239
return 0;
240
}
241
242
int do_sigaction(int sig, const struct sigaction *act,
243
struct sigaction *oact)
244
{
245
struct emulated_sigaction *k;
246
struct sigaction act1;
247
int host_sig;
248
249
if (sig < 1 || sig > NSIG)
250
return -EINVAL;
251
252
k = &sigact_table[sig - 1];
253
#if defined(DEBUG_SIGNAL)
254
fprintf(stderr, "sigaction 1 sig=%d act=0x%08x, oact=0x%08x\n",
255
sig, (int)act, (int)oact);
256
#endif
257
if (oact) {
258
#if defined(DEBUG_SIGNAL)
259
fprintf(stderr, "sigaction 1 sig=%d act=0x%08x, oact=0x%08x\n",
260
sig, (int)act, (int)oact);
261
#endif
262
263
oact->sa_handler = tswapl(k->sa.sa_handler);
264
oact->sa_flags = tswapl(k->sa.sa_flags);
265
oact->sa_mask = tswapl(k->sa.sa_mask);
266
}
267
if (act) {
268
#if defined(DEBUG_SIGNAL)
269
fprintf(stderr, "sigaction handler 0x%x flag 0x%x mask 0x%x\n",
270
act->sa_handler, act->sa_flags, act->sa_mask);
271
#endif
272
273
k->sa.sa_handler = tswapl(act->sa_handler);
274
k->sa.sa_flags = tswapl(act->sa_flags);
275
k->sa.sa_mask = tswapl(act->sa_mask);
276
/* we update the host signal state */
277
host_sig = target_to_host_signal(sig);
278
if (host_sig != SIGSEGV && host_sig != SIGBUS) {
279
#if defined(DEBUG_SIGNAL)
280
fprintf(stderr, "sigaction handler going to call sigaction\n",
281
act->sa_handler, act->sa_flags, act->sa_mask);
282
#endif
283
284
sigfillset(&act1.sa_mask);
285
act1.sa_flags = SA_SIGINFO;
286
if (k->sa.sa_flags & SA_RESTART)
287
act1.sa_flags |= SA_RESTART;
288
/* NOTE: it is important to update the host kernel signal
289
ignore state to avoid getting unexpected interrupted
290
syscalls */
291
if (k->sa.sa_handler == SIG_IGN) {
292
act1.sa_sigaction = (void *)SIG_IGN;
293
} else if (k->sa.sa_handler == SIG_DFL) {
294
act1.sa_sigaction = (void *)SIG_DFL;
295
} else {
296
act1.sa_sigaction = host_signal_handler;
297
}
298
sigaction(host_sig, &act1, NULL);
299
}
300
}
301
return 0;
302
}
303
304
305
#ifdef TARGET_I386
306
307
static inline void *
308
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
309
{
310
/* XXX Fix that */
311
if(target_sigaltstack_used.ss_flags & SA_DISABLE)
312
{
313
int esp;
314
/* Default to using normal stack */
315
esp = env->regs[R_ESP];
316
317
return (void *)((esp - frame_size) & -8ul);
318
}
319
else
320
{
321
return target_sigaltstack_used.ss_sp;
322
}
323
}
324
325
static void setup_frame(int sig, struct emulated_sigaction *ka,
326
void *set, CPUState *env)
327
{
328
void *frame;
329
int i, err = 0;
330
331
fprintf(stderr, "setup_frame %d\n", sig);
332
frame = get_sigframe(ka, env, sizeof(*frame));
333
334
/* Set up registers for signal handler */
335
env->regs[R_ESP] = (unsigned long) frame;
336
env->eip = (unsigned long) ka->sa.sa_handler;
337
338
env->eflags &= ~TF_MASK;
339
340
return;
341
342
give_sigsegv:
343
if (sig == SIGSEGV)
344
ka->sa.sa_handler = SIG_DFL;
345
force_sig(SIGSEGV /* , current */);
346
}
347
348
long do_sigreturn(CPUState *env, int num)
349
{
350
int i = 0;
351
struct target_sigcontext *scp = get_int_arg(&i, env);
352
/* XXX Get current signal number */
353
/* XXX Adjust accordin to sc_onstack, sc_mask */
354
if(tswapl(scp->sc_onstack) & 0x1)
355
target_sigaltstack_used.ss_flags |= ~SA_DISABLE;
356
else
357
target_sigaltstack_used.ss_flags &= SA_DISABLE;
358
int set = tswapl(scp->sc_eax);
359
sigprocmask(SIG_SETMASK, &set, NULL);
360
361
fprintf(stderr, "do_sigreturn: partially implemented %x EAX:%x EBX:%x\n", scp->sc_mask, tswapl(scp->sc_eax), tswapl(scp->sc_ebx));
362
fprintf(stderr, "ECX:%x EDX:%x EDI:%x\n", scp->sc_ecx, tswapl(scp->sc_edx), tswapl(scp->sc_edi));
363
fprintf(stderr, "EIP:%x\n", tswapl(scp->sc_eip));
364
365
env->regs[R_EAX] = tswapl(scp->sc_eax);
366
env->regs[R_EBX] = tswapl(scp->sc_ebx);
367
env->regs[R_ECX] = tswapl(scp->sc_ecx);
368
env->regs[R_EDX] = tswapl(scp->sc_edx);
369
env->regs[R_EDI] = tswapl(scp->sc_edi);
370
env->regs[R_ESI] = tswapl(scp->sc_esi);
371
env->regs[R_EBP] = tswapl(scp->sc_ebp);
372
env->regs[R_ESP] = tswapl(scp->sc_esp);
373
env->segs[R_SS].selector = (void*)tswapl(scp->sc_ss);
374
env->eflags = tswapl(scp->sc_eflags);
375
env->eip = tswapl(scp->sc_eip);
376
env->segs[R_CS].selector = (void*)tswapl(scp->sc_cs);
377
env->segs[R_DS].selector = (void*)tswapl(scp->sc_ds);
378
env->segs[R_ES].selector = (void*)tswapl(scp->sc_es);
379
env->segs[R_FS].selector = (void*)tswapl(scp->sc_fs);
380
env->segs[R_GS].selector = (void*)tswapl(scp->sc_gs);
381
382
/* Again, because our caller's caller will reset EAX */
383
return env->regs[R_EAX];
384
}
385
386
#else
387
388
static void setup_frame(int sig, struct emulated_sigaction *ka,
389
void *set, CPUState *env)
390
{
391
fprintf(stderr, "setup_frame: not implemented\n");
392
}
393
394
long do_sigreturn(CPUState *env, int num)
395
{
396
int i = 0;
397
struct target_sigcontext *scp = get_int_arg(&i, env);
398
fprintf(stderr, "do_sigreturn: not implemented\n");
399
return -ENOSYS;
400
}
401
402
#endif
403
404
void process_pending_signals(void *cpu_env)
405
{
406
struct emulated_sigaction *k;
407
struct sigqueue *q;
408
target_ulong handler;
409
int sig;
410
411
if (!signal_pending)
412
return;
413
414
k = sigact_table;
415
416
for(sig = 1; sig <= NSIG; sig++) {
417
if (k->pending)
418
goto handle_signal;
419
k++;
420
}
421
422
/* if no signal is pending, just return */
423
signal_pending = 0;
424
return;
425
handle_signal:
426
#ifdef DEBUG_SIGNAL
427
fprintf(stderr, "qemu: process signal %d\n", sig);
428
#endif
429
/* dequeue signal */
430
q = k->first;
431
k->first = q->next;
432
if (!k->first)
433
k->pending = 0;
434
435
sig = gdb_handlesig (cpu_env, sig);
436
if (!sig) {
437
fprintf (stderr, "Lost signal\n");
438
abort();
439
}
440
441
handler = k->sa.sa_handler;
442
if (handler == SIG_DFL) {
443
/* default handler : ignore some signal. The other are fatal */
444
if (sig != SIGCHLD &&
445
sig != SIGURG &&
446
sig != SIGWINCH) {
447
force_sig(sig);
448
}
449
} else if (handler == SIG_IGN) {
450
/* ignore sig */
451
} else if (handler == SIG_ERR) {
452
force_sig(sig);
453
} else {
454
455
setup_frame(sig, k, 0, cpu_env);
456
if (k->sa.sa_flags & SA_RESETHAND)
457
k->sa.sa_handler = SIG_DFL;
458
}
459
if (q != &k->info)
460
free_sigqueue(q);
461
}
462
463
Loggerhead is a web-based interface for Breezy
Version: 2.0.1