]>
Commit | Line | Data |
---|---|---|
31e31b8a | 1 | /* |
66fb9763 | 2 | * Emulation of Linux signals |
5fafdf24 | 3 | * |
31e31b8a FB |
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 | |
8167ee88 | 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
31e31b8a | 18 | */ |
d39594e9 | 19 | #include "qemu/osdep.h" |
a70dadc7 | 20 | #include "qemu/bitops.h" |
31e31b8a | 21 | #include <sys/ucontext.h> |
edf8e2af | 22 | #include <sys/resource.h> |
31e31b8a | 23 | |
3ef693a0 | 24 | #include "qemu.h" |
c8ee0a44 | 25 | #include "trace.h" |
befb7447 | 26 | #include "signal-common.h" |
66fb9763 | 27 | |
624f7979 | 28 | static struct target_sigaction sigact_table[TARGET_NSIG]; |
31e31b8a | 29 | |
5fafdf24 | 30 | static void host_signal_handler(int host_signum, siginfo_t *info, |
66fb9763 FB |
31 | void *puc); |
32 | ||
9fcff3a6 LV |
33 | |
34 | /* | |
35 | * System includes define _NSIG as SIGRTMAX + 1, | |
36 | * but qemu (like the kernel) defines TARGET_NSIG as TARGET_SIGRTMAX | |
37 | * and the first signal is SIGHUP defined as 1 | |
38 | * Signal number 0 is reserved for use as kill(pid, 0), to test whether | |
39 | * a process exists without sending it a signal. | |
40 | */ | |
41 | QEMU_BUILD_BUG_ON(__SIGRTMAX + 1 != _NSIG); | |
3ca05588 | 42 | static uint8_t host_to_target_signal_table[_NSIG] = { |
9e5f5284 FB |
43 | [SIGHUP] = TARGET_SIGHUP, |
44 | [SIGINT] = TARGET_SIGINT, | |
45 | [SIGQUIT] = TARGET_SIGQUIT, | |
46 | [SIGILL] = TARGET_SIGILL, | |
47 | [SIGTRAP] = TARGET_SIGTRAP, | |
48 | [SIGABRT] = TARGET_SIGABRT, | |
01e3b763 | 49 | /* [SIGIOT] = TARGET_SIGIOT,*/ |
9e5f5284 FB |
50 | [SIGBUS] = TARGET_SIGBUS, |
51 | [SIGFPE] = TARGET_SIGFPE, | |
52 | [SIGKILL] = TARGET_SIGKILL, | |
53 | [SIGUSR1] = TARGET_SIGUSR1, | |
54 | [SIGSEGV] = TARGET_SIGSEGV, | |
55 | [SIGUSR2] = TARGET_SIGUSR2, | |
56 | [SIGPIPE] = TARGET_SIGPIPE, | |
57 | [SIGALRM] = TARGET_SIGALRM, | |
58 | [SIGTERM] = TARGET_SIGTERM, | |
59 | #ifdef SIGSTKFLT | |
60 | [SIGSTKFLT] = TARGET_SIGSTKFLT, | |
61 | #endif | |
62 | [SIGCHLD] = TARGET_SIGCHLD, | |
63 | [SIGCONT] = TARGET_SIGCONT, | |
64 | [SIGSTOP] = TARGET_SIGSTOP, | |
65 | [SIGTSTP] = TARGET_SIGTSTP, | |
66 | [SIGTTIN] = TARGET_SIGTTIN, | |
67 | [SIGTTOU] = TARGET_SIGTTOU, | |
68 | [SIGURG] = TARGET_SIGURG, | |
69 | [SIGXCPU] = TARGET_SIGXCPU, | |
70 | [SIGXFSZ] = TARGET_SIGXFSZ, | |
71 | [SIGVTALRM] = TARGET_SIGVTALRM, | |
72 | [SIGPROF] = TARGET_SIGPROF, | |
73 | [SIGWINCH] = TARGET_SIGWINCH, | |
74 | [SIGIO] = TARGET_SIGIO, | |
75 | [SIGPWR] = TARGET_SIGPWR, | |
76 | [SIGSYS] = TARGET_SIGSYS, | |
77 | /* next signals stay the same */ | |
78 | }; | |
9e5f5284 | 79 | |
9fcff3a6 LV |
80 | static uint8_t target_to_host_signal_table[TARGET_NSIG + 1]; |
81 | ||
82 | /* valid sig is between 1 and _NSIG - 1 */ | |
1d9d8b55 | 83 | int host_to_target_signal(int sig) |
31e31b8a | 84 | { |
9fcff3a6 | 85 | if (sig < 1 || sig >= _NSIG) { |
4cb05961 | 86 | return sig; |
9fcff3a6 | 87 | } |
9e5f5284 | 88 | return host_to_target_signal_table[sig]; |
31e31b8a FB |
89 | } |
90 | ||
9fcff3a6 | 91 | /* valid sig is between 1 and TARGET_NSIG */ |
4cb05961 | 92 | int target_to_host_signal(int sig) |
31e31b8a | 93 | { |
9fcff3a6 | 94 | if (sig < 1 || sig > TARGET_NSIG) { |
4cb05961 | 95 | return sig; |
9fcff3a6 | 96 | } |
9e5f5284 | 97 | return target_to_host_signal_table[sig]; |
31e31b8a FB |
98 | } |
99 | ||
c227f099 | 100 | static inline void target_sigaddset(target_sigset_t *set, int signum) |
f5545b5c PB |
101 | { |
102 | signum--; | |
103 | abi_ulong mask = (abi_ulong)1 << (signum % TARGET_NSIG_BPW); | |
104 | set->sig[signum / TARGET_NSIG_BPW] |= mask; | |
105 | } | |
106 | ||
c227f099 | 107 | static inline int target_sigismember(const target_sigset_t *set, int signum) |
f5545b5c PB |
108 | { |
109 | signum--; | |
110 | abi_ulong mask = (abi_ulong)1 << (signum % TARGET_NSIG_BPW); | |
111 | return ((set->sig[signum / TARGET_NSIG_BPW] & mask) != 0); | |
112 | } | |
113 | ||
befb7447 LV |
114 | void host_to_target_sigset_internal(target_sigset_t *d, |
115 | const sigset_t *s) | |
66fb9763 | 116 | { |
9fcff3a6 | 117 | int host_sig, target_sig; |
f5545b5c | 118 | target_sigemptyset(d); |
9fcff3a6 LV |
119 | for (host_sig = 1; host_sig < _NSIG; host_sig++) { |
120 | target_sig = host_to_target_signal(host_sig); | |
121 | if (target_sig < 1 || target_sig > TARGET_NSIG) { | |
122 | continue; | |
123 | } | |
124 | if (sigismember(s, host_sig)) { | |
125 | target_sigaddset(d, target_sig); | |
f5545b5c | 126 | } |
66fb9763 FB |
127 | } |
128 | } | |
129 | ||
c227f099 | 130 | void host_to_target_sigset(target_sigset_t *d, const sigset_t *s) |
9231944d | 131 | { |
c227f099 | 132 | target_sigset_t d1; |
9231944d FB |
133 | int i; |
134 | ||
135 | host_to_target_sigset_internal(&d1, s); | |
136 | for(i = 0;i < TARGET_NSIG_WORDS; i++) | |
cbb21eed | 137 | d->sig[i] = tswapal(d1.sig[i]); |
9231944d FB |
138 | } |
139 | ||
befb7447 LV |
140 | void target_to_host_sigset_internal(sigset_t *d, |
141 | const target_sigset_t *s) | |
66fb9763 | 142 | { |
9fcff3a6 | 143 | int host_sig, target_sig; |
f5545b5c | 144 | sigemptyset(d); |
9fcff3a6 LV |
145 | for (target_sig = 1; target_sig <= TARGET_NSIG; target_sig++) { |
146 | host_sig = target_to_host_signal(target_sig); | |
147 | if (host_sig < 1 || host_sig >= _NSIG) { | |
148 | continue; | |
149 | } | |
150 | if (target_sigismember(s, target_sig)) { | |
151 | sigaddset(d, host_sig); | |
f5545b5c | 152 | } |
da7c8647 | 153 | } |
66fb9763 FB |
154 | } |
155 | ||
c227f099 | 156 | void target_to_host_sigset(sigset_t *d, const target_sigset_t *s) |
9231944d | 157 | { |
c227f099 | 158 | target_sigset_t s1; |
9231944d FB |
159 | int i; |
160 | ||
161 | for(i = 0;i < TARGET_NSIG_WORDS; i++) | |
cbb21eed | 162 | s1.sig[i] = tswapal(s->sig[i]); |
9231944d FB |
163 | target_to_host_sigset_internal(d, &s1); |
164 | } | |
3b46e624 | 165 | |
992f48a0 | 166 | void host_to_target_old_sigset(abi_ulong *old_sigset, |
66fb9763 FB |
167 | const sigset_t *sigset) |
168 | { | |
c227f099 | 169 | target_sigset_t d; |
9e5f5284 FB |
170 | host_to_target_sigset(&d, sigset); |
171 | *old_sigset = d.sig[0]; | |
66fb9763 FB |
172 | } |
173 | ||
5fafdf24 | 174 | void target_to_host_old_sigset(sigset_t *sigset, |
992f48a0 | 175 | const abi_ulong *old_sigset) |
66fb9763 | 176 | { |
c227f099 | 177 | target_sigset_t d; |
9e5f5284 FB |
178 | int i; |
179 | ||
180 | d.sig[0] = *old_sigset; | |
181 | for(i = 1;i < TARGET_NSIG_WORDS; i++) | |
182 | d.sig[i] = 0; | |
183 | target_to_host_sigset(sigset, &d); | |
66fb9763 FB |
184 | } |
185 | ||
3d3efba0 PM |
186 | int block_signals(void) |
187 | { | |
188 | TaskState *ts = (TaskState *)thread_cpu->opaque; | |
189 | sigset_t set; | |
3d3efba0 PM |
190 | |
191 | /* It's OK to block everything including SIGSEGV, because we won't | |
192 | * run any further guest code before unblocking signals in | |
193 | * process_pending_signals(). | |
194 | */ | |
195 | sigfillset(&set); | |
196 | sigprocmask(SIG_SETMASK, &set, 0); | |
197 | ||
d73415a3 | 198 | return qatomic_xchg(&ts->signal_pending, 1); |
3d3efba0 PM |
199 | } |
200 | ||
1c275925 AB |
201 | /* Wrapper for sigprocmask function |
202 | * Emulates a sigprocmask in a safe way for the guest. Note that set and oldset | |
3d3efba0 PM |
203 | * are host signal set, not guest ones. Returns -TARGET_ERESTARTSYS if |
204 | * a signal was already pending and the syscall must be restarted, or | |
205 | * 0 on success. | |
206 | * If set is NULL, this is guaranteed not to fail. | |
1c275925 AB |
207 | */ |
208 | int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset) | |
209 | { | |
3d3efba0 PM |
210 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
211 | ||
212 | if (oldset) { | |
213 | *oldset = ts->signal_mask; | |
214 | } | |
a7ec0f98 PM |
215 | |
216 | if (set) { | |
3d3efba0 | 217 | int i; |
a7ec0f98 | 218 | |
3d3efba0 PM |
219 | if (block_signals()) { |
220 | return -TARGET_ERESTARTSYS; | |
221 | } | |
a7ec0f98 PM |
222 | |
223 | switch (how) { | |
224 | case SIG_BLOCK: | |
3d3efba0 | 225 | sigorset(&ts->signal_mask, &ts->signal_mask, set); |
a7ec0f98 PM |
226 | break; |
227 | case SIG_UNBLOCK: | |
3d3efba0 PM |
228 | for (i = 1; i <= NSIG; ++i) { |
229 | if (sigismember(set, i)) { | |
230 | sigdelset(&ts->signal_mask, i); | |
231 | } | |
a7ec0f98 PM |
232 | } |
233 | break; | |
234 | case SIG_SETMASK: | |
3d3efba0 | 235 | ts->signal_mask = *set; |
a7ec0f98 PM |
236 | break; |
237 | default: | |
238 | g_assert_not_reached(); | |
239 | } | |
a7ec0f98 | 240 | |
3d3efba0 PM |
241 | /* Silently ignore attempts to change blocking status of KILL or STOP */ |
242 | sigdelset(&ts->signal_mask, SIGKILL); | |
243 | sigdelset(&ts->signal_mask, SIGSTOP); | |
a7ec0f98 | 244 | } |
3d3efba0 | 245 | return 0; |
1c275925 AB |
246 | } |
247 | ||
e8f29049 | 248 | #if !defined(TARGET_NIOS2) |
3d3efba0 PM |
249 | /* Just set the guest's signal mask to the specified value; the |
250 | * caller is assumed to have called block_signals() already. | |
251 | */ | |
befb7447 | 252 | void set_sigmask(const sigset_t *set) |
9eede5b6 | 253 | { |
3d3efba0 PM |
254 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
255 | ||
256 | ts->signal_mask = *set; | |
9eede5b6 PM |
257 | } |
258 | #endif | |
259 | ||
465e237b LV |
260 | /* sigaltstack management */ |
261 | ||
262 | int on_sig_stack(unsigned long sp) | |
263 | { | |
5bfce0b7 PM |
264 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
265 | ||
266 | return (sp - ts->sigaltstack_used.ss_sp | |
267 | < ts->sigaltstack_used.ss_size); | |
465e237b LV |
268 | } |
269 | ||
270 | int sas_ss_flags(unsigned long sp) | |
271 | { | |
5bfce0b7 PM |
272 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
273 | ||
274 | return (ts->sigaltstack_used.ss_size == 0 ? SS_DISABLE | |
465e237b LV |
275 | : on_sig_stack(sp) ? SS_ONSTACK : 0); |
276 | } | |
277 | ||
278 | abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka) | |
279 | { | |
280 | /* | |
281 | * This is the X/Open sanctioned signal stack switching. | |
282 | */ | |
5bfce0b7 PM |
283 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
284 | ||
465e237b | 285 | if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) { |
5bfce0b7 | 286 | return ts->sigaltstack_used.ss_sp + ts->sigaltstack_used.ss_size; |
465e237b LV |
287 | } |
288 | return sp; | |
289 | } | |
290 | ||
291 | void target_save_altstack(target_stack_t *uss, CPUArchState *env) | |
292 | { | |
5bfce0b7 PM |
293 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
294 | ||
295 | __put_user(ts->sigaltstack_used.ss_sp, &uss->ss_sp); | |
465e237b | 296 | __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &uss->ss_flags); |
5bfce0b7 | 297 | __put_user(ts->sigaltstack_used.ss_size, &uss->ss_size); |
465e237b LV |
298 | } |
299 | ||
ddc3e74d | 300 | abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env) |
92bad948 RH |
301 | { |
302 | TaskState *ts = (TaskState *)thread_cpu->opaque; | |
303 | size_t minstacksize = TARGET_MINSIGSTKSZ; | |
304 | target_stack_t ss; | |
305 | ||
306 | #if defined(TARGET_PPC64) | |
307 | /* ELF V2 for PPC64 has a 4K minimum stack size for signal handlers */ | |
308 | struct image_info *image = ts->info; | |
309 | if (get_ppc64_abi(image) > 1) { | |
310 | minstacksize = 4096; | |
311 | } | |
312 | #endif | |
313 | ||
314 | __get_user(ss.ss_sp, &uss->ss_sp); | |
315 | __get_user(ss.ss_size, &uss->ss_size); | |
316 | __get_user(ss.ss_flags, &uss->ss_flags); | |
317 | ||
ddc3e74d | 318 | if (on_sig_stack(get_sp_from_cpustate(env))) { |
92bad948 RH |
319 | return -TARGET_EPERM; |
320 | } | |
321 | ||
322 | switch (ss.ss_flags) { | |
323 | default: | |
324 | return -TARGET_EINVAL; | |
325 | ||
326 | case TARGET_SS_DISABLE: | |
327 | ss.ss_size = 0; | |
328 | ss.ss_sp = 0; | |
329 | break; | |
330 | ||
331 | case TARGET_SS_ONSTACK: | |
332 | case 0: | |
333 | if (ss.ss_size < minstacksize) { | |
334 | return -TARGET_ENOMEM; | |
335 | } | |
336 | break; | |
337 | } | |
338 | ||
339 | ts->sigaltstack_used.ss_sp = ss.ss_sp; | |
340 | ts->sigaltstack_used.ss_size = ss.ss_size; | |
341 | return 0; | |
342 | } | |
343 | ||
9de5e440 FB |
344 | /* siginfo conversion */ |
345 | ||
c227f099 | 346 | static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, |
9de5e440 | 347 | const siginfo_t *info) |
66fb9763 | 348 | { |
a05c6409 | 349 | int sig = host_to_target_signal(info->si_signo); |
a70dadc7 PM |
350 | int si_code = info->si_code; |
351 | int si_type; | |
9de5e440 FB |
352 | tinfo->si_signo = sig; |
353 | tinfo->si_errno = 0; | |
afd7cd92 | 354 | tinfo->si_code = info->si_code; |
a05c6409 | 355 | |
55d72a7e PM |
356 | /* This memset serves two purposes: |
357 | * (1) ensure we don't leak random junk to the guest later | |
358 | * (2) placate false positives from gcc about fields | |
359 | * being used uninitialized if it chooses to inline both this | |
360 | * function and tswap_siginfo() into host_to_target_siginfo(). | |
361 | */ | |
362 | memset(tinfo->_sifields._pad, 0, sizeof(tinfo->_sifields._pad)); | |
363 | ||
a70dadc7 PM |
364 | /* This is awkward, because we have to use a combination of |
365 | * the si_code and si_signo to figure out which of the union's | |
366 | * members are valid. (Within the host kernel it is always possible | |
367 | * to tell, but the kernel carefully avoids giving userspace the | |
368 | * high 16 bits of si_code, so we don't have the information to | |
369 | * do this the easy way...) We therefore make our best guess, | |
370 | * bearing in mind that a guest can spoof most of the si_codes | |
371 | * via rt_sigqueueinfo() if it likes. | |
372 | * | |
373 | * Once we have made our guess, we record it in the top 16 bits of | |
374 | * the si_code, so that tswap_siginfo() later can use it. | |
375 | * tswap_siginfo() will strip these top bits out before writing | |
376 | * si_code to the guest (sign-extending the lower bits). | |
377 | */ | |
378 | ||
379 | switch (si_code) { | |
380 | case SI_USER: | |
381 | case SI_TKILL: | |
382 | case SI_KERNEL: | |
383 | /* Sent via kill(), tkill() or tgkill(), or direct from the kernel. | |
384 | * These are the only unspoofable si_code values. | |
385 | */ | |
386 | tinfo->_sifields._kill._pid = info->si_pid; | |
387 | tinfo->_sifields._kill._uid = info->si_uid; | |
388 | si_type = QEMU_SI_KILL; | |
389 | break; | |
390 | default: | |
391 | /* Everything else is spoofable. Make best guess based on signal */ | |
392 | switch (sig) { | |
393 | case TARGET_SIGCHLD: | |
394 | tinfo->_sifields._sigchld._pid = info->si_pid; | |
395 | tinfo->_sifields._sigchld._uid = info->si_uid; | |
1c3dfb50 | 396 | tinfo->_sifields._sigchld._status = info->si_status; |
a70dadc7 PM |
397 | tinfo->_sifields._sigchld._utime = info->si_utime; |
398 | tinfo->_sifields._sigchld._stime = info->si_stime; | |
399 | si_type = QEMU_SI_CHLD; | |
400 | break; | |
401 | case TARGET_SIGIO: | |
402 | tinfo->_sifields._sigpoll._band = info->si_band; | |
403 | tinfo->_sifields._sigpoll._fd = info->si_fd; | |
404 | si_type = QEMU_SI_POLL; | |
405 | break; | |
406 | default: | |
407 | /* Assume a sigqueue()/mq_notify()/rt_sigqueueinfo() source. */ | |
408 | tinfo->_sifields._rt._pid = info->si_pid; | |
409 | tinfo->_sifields._rt._uid = info->si_uid; | |
410 | /* XXX: potential problem if 64 bit */ | |
411 | tinfo->_sifields._rt._sigval.sival_ptr | |
da7c8647 | 412 | = (abi_ulong)(unsigned long)info->si_value.sival_ptr; |
a70dadc7 PM |
413 | si_type = QEMU_SI_RT; |
414 | break; | |
415 | } | |
416 | break; | |
9de5e440 | 417 | } |
a70dadc7 PM |
418 | |
419 | tinfo->si_code = deposit32(si_code, 16, 16, si_type); | |
9de5e440 FB |
420 | } |
421 | ||
befb7447 LV |
422 | void tswap_siginfo(target_siginfo_t *tinfo, |
423 | const target_siginfo_t *info) | |
9de5e440 | 424 | { |
a70dadc7 PM |
425 | int si_type = extract32(info->si_code, 16, 16); |
426 | int si_code = sextract32(info->si_code, 0, 16); | |
427 | ||
428 | __put_user(info->si_signo, &tinfo->si_signo); | |
429 | __put_user(info->si_errno, &tinfo->si_errno); | |
430 | __put_user(si_code, &tinfo->si_code); | |
431 | ||
432 | /* We can use our internal marker of which fields in the structure | |
433 | * are valid, rather than duplicating the guesswork of | |
434 | * host_to_target_siginfo_noswap() here. | |
435 | */ | |
436 | switch (si_type) { | |
437 | case QEMU_SI_KILL: | |
438 | __put_user(info->_sifields._kill._pid, &tinfo->_sifields._kill._pid); | |
439 | __put_user(info->_sifields._kill._uid, &tinfo->_sifields._kill._uid); | |
440 | break; | |
441 | case QEMU_SI_TIMER: | |
442 | __put_user(info->_sifields._timer._timer1, | |
443 | &tinfo->_sifields._timer._timer1); | |
444 | __put_user(info->_sifields._timer._timer2, | |
445 | &tinfo->_sifields._timer._timer2); | |
446 | break; | |
447 | case QEMU_SI_POLL: | |
448 | __put_user(info->_sifields._sigpoll._band, | |
449 | &tinfo->_sifields._sigpoll._band); | |
450 | __put_user(info->_sifields._sigpoll._fd, | |
451 | &tinfo->_sifields._sigpoll._fd); | |
452 | break; | |
453 | case QEMU_SI_FAULT: | |
454 | __put_user(info->_sifields._sigfault._addr, | |
455 | &tinfo->_sifields._sigfault._addr); | |
456 | break; | |
457 | case QEMU_SI_CHLD: | |
458 | __put_user(info->_sifields._sigchld._pid, | |
459 | &tinfo->_sifields._sigchld._pid); | |
460 | __put_user(info->_sifields._sigchld._uid, | |
461 | &tinfo->_sifields._sigchld._uid); | |
462 | __put_user(info->_sifields._sigchld._status, | |
463 | &tinfo->_sifields._sigchld._status); | |
464 | __put_user(info->_sifields._sigchld._utime, | |
465 | &tinfo->_sifields._sigchld._utime); | |
466 | __put_user(info->_sifields._sigchld._stime, | |
467 | &tinfo->_sifields._sigchld._stime); | |
468 | break; | |
469 | case QEMU_SI_RT: | |
470 | __put_user(info->_sifields._rt._pid, &tinfo->_sifields._rt._pid); | |
471 | __put_user(info->_sifields._rt._uid, &tinfo->_sifields._rt._uid); | |
472 | __put_user(info->_sifields._rt._sigval.sival_ptr, | |
473 | &tinfo->_sifields._rt._sigval.sival_ptr); | |
474 | break; | |
475 | default: | |
476 | g_assert_not_reached(); | |
9de5e440 FB |
477 | } |
478 | } | |
479 | ||
c227f099 | 480 | void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info) |
9de5e440 | 481 | { |
55d72a7e PM |
482 | target_siginfo_t tgt_tmp; |
483 | host_to_target_siginfo_noswap(&tgt_tmp, info); | |
484 | tswap_siginfo(tinfo, &tgt_tmp); | |
66fb9763 FB |
485 | } |
486 | ||
9de5e440 | 487 | /* XXX: we support only POSIX RT signals are used. */ |
aa1f17c1 | 488 | /* XXX: find a solution for 64 bit (additional malloced data is needed) */ |
c227f099 | 489 | void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo) |
66fb9763 | 490 | { |
90c0f080 PM |
491 | /* This conversion is used only for the rt_sigqueueinfo syscall, |
492 | * and so we know that the _rt fields are the valid ones. | |
493 | */ | |
494 | abi_ulong sival_ptr; | |
495 | ||
496 | __get_user(info->si_signo, &tinfo->si_signo); | |
497 | __get_user(info->si_errno, &tinfo->si_errno); | |
498 | __get_user(info->si_code, &tinfo->si_code); | |
499 | __get_user(info->si_pid, &tinfo->_sifields._rt._pid); | |
500 | __get_user(info->si_uid, &tinfo->_sifields._rt._uid); | |
501 | __get_user(sival_ptr, &tinfo->_sifields._rt._sigval.sival_ptr); | |
502 | info->si_value.sival_ptr = (void *)(long)sival_ptr; | |
66fb9763 FB |
503 | } |
504 | ||
ca587a8e AJ |
505 | static int fatal_signal (int sig) |
506 | { | |
507 | switch (sig) { | |
508 | case TARGET_SIGCHLD: | |
509 | case TARGET_SIGURG: | |
510 | case TARGET_SIGWINCH: | |
511 | /* Ignored by default. */ | |
512 | return 0; | |
513 | case TARGET_SIGCONT: | |
514 | case TARGET_SIGSTOP: | |
515 | case TARGET_SIGTSTP: | |
516 | case TARGET_SIGTTIN: | |
517 | case TARGET_SIGTTOU: | |
518 | /* Job control signals. */ | |
519 | return 0; | |
520 | default: | |
521 | return 1; | |
522 | } | |
523 | } | |
524 | ||
edf8e2af MW |
525 | /* returns 1 if given signal should dump core if not handled */ |
526 | static int core_dump_signal(int sig) | |
527 | { | |
528 | switch (sig) { | |
529 | case TARGET_SIGABRT: | |
530 | case TARGET_SIGFPE: | |
531 | case TARGET_SIGILL: | |
532 | case TARGET_SIGQUIT: | |
533 | case TARGET_SIGSEGV: | |
534 | case TARGET_SIGTRAP: | |
535 | case TARGET_SIGBUS: | |
536 | return (1); | |
537 | default: | |
538 | return (0); | |
539 | } | |
540 | } | |
541 | ||
365510fb LV |
542 | static void signal_table_init(void) |
543 | { | |
6bc024e7 | 544 | int host_sig, target_sig, count; |
365510fb LV |
545 | |
546 | /* | |
6bc024e7 LV |
547 | * Signals are supported starting from TARGET_SIGRTMIN and going up |
548 | * until we run out of host realtime signals. | |
549 | * glibc at least uses only the lower 2 rt signals and probably | |
550 | * nobody's using the upper ones. | |
551 | * it's why SIGRTMIN (34) is generally greater than __SIGRTMIN (32) | |
365510fb LV |
552 | * To fix this properly we need to do manual signal delivery multiplexed |
553 | * over a single host signal. | |
6bc024e7 LV |
554 | * Attempts for configure "missing" signals via sigaction will be |
555 | * silently ignored. | |
365510fb | 556 | */ |
6bc024e7 LV |
557 | for (host_sig = SIGRTMIN; host_sig <= SIGRTMAX; host_sig++) { |
558 | target_sig = host_sig - SIGRTMIN + TARGET_SIGRTMIN; | |
559 | if (target_sig <= TARGET_NSIG) { | |
560 | host_to_target_signal_table[host_sig] = target_sig; | |
561 | } | |
562 | } | |
365510fb LV |
563 | |
564 | /* generate signal conversion tables */ | |
6bc024e7 LV |
565 | for (target_sig = 1; target_sig <= TARGET_NSIG; target_sig++) { |
566 | target_to_host_signal_table[target_sig] = _NSIG; /* poison */ | |
567 | } | |
365510fb LV |
568 | for (host_sig = 1; host_sig < _NSIG; host_sig++) { |
569 | if (host_to_target_signal_table[host_sig] == 0) { | |
570 | host_to_target_signal_table[host_sig] = host_sig; | |
571 | } | |
365510fb | 572 | target_sig = host_to_target_signal_table[host_sig]; |
9fcff3a6 LV |
573 | if (target_sig <= TARGET_NSIG) { |
574 | target_to_host_signal_table[target_sig] = host_sig; | |
575 | } | |
365510fb | 576 | } |
6bc024e7 LV |
577 | |
578 | if (trace_event_get_state_backends(TRACE_SIGNAL_TABLE_INIT)) { | |
579 | for (target_sig = 1, count = 0; target_sig <= TARGET_NSIG; target_sig++) { | |
580 | if (target_to_host_signal_table[target_sig] == _NSIG) { | |
581 | count++; | |
582 | } | |
583 | } | |
584 | trace_signal_table_init(count); | |
585 | } | |
365510fb LV |
586 | } |
587 | ||
31e31b8a FB |
588 | void signal_init(void) |
589 | { | |
3d3efba0 | 590 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
31e31b8a | 591 | struct sigaction act; |
624f7979 | 592 | struct sigaction oact; |
365510fb | 593 | int i; |
624f7979 | 594 | int host_sig; |
31e31b8a | 595 | |
365510fb LV |
596 | /* initialize signal conversion tables */ |
597 | signal_table_init(); | |
3b46e624 | 598 | |
3d3efba0 PM |
599 | /* Set the signal mask from the host mask. */ |
600 | sigprocmask(0, 0, &ts->signal_mask); | |
601 | ||
9de5e440 | 602 | sigfillset(&act.sa_mask); |
31e31b8a FB |
603 | act.sa_flags = SA_SIGINFO; |
604 | act.sa_sigaction = host_signal_handler; | |
624f7979 | 605 | for(i = 1; i <= TARGET_NSIG; i++) { |
4cc600d2 | 606 | #ifdef CONFIG_GPROF |
9fcff3a6 | 607 | if (i == TARGET_SIGPROF) { |
716cdbe0 AB |
608 | continue; |
609 | } | |
610 | #endif | |
624f7979 PB |
611 | host_sig = target_to_host_signal(i); |
612 | sigaction(host_sig, NULL, &oact); | |
613 | if (oact.sa_sigaction == (void *)SIG_IGN) { | |
614 | sigact_table[i - 1]._sa_handler = TARGET_SIG_IGN; | |
615 | } else if (oact.sa_sigaction == (void *)SIG_DFL) { | |
616 | sigact_table[i - 1]._sa_handler = TARGET_SIG_DFL; | |
617 | } | |
618 | /* If there's already a handler installed then something has | |
619 | gone horribly wrong, so don't even try to handle that case. */ | |
ca587a8e AJ |
620 | /* Install some handlers for our own use. We need at least |
621 | SIGSEGV and SIGBUS, to detect exceptions. We can not just | |
622 | trap all signals because it affects syscall interrupt | |
623 | behavior. But do trap all default-fatal signals. */ | |
624 | if (fatal_signal (i)) | |
624f7979 | 625 | sigaction(host_sig, &act, NULL); |
31e31b8a | 626 | } |
66fb9763 FB |
627 | } |
628 | ||
c599d4d6 PM |
629 | /* Force a synchronously taken signal. The kernel force_sig() function |
630 | * also forces the signal to "not blocked, not ignored", but for QEMU | |
631 | * that work is done in process_pending_signals(). | |
632 | */ | |
befb7447 | 633 | void force_sig(int sig) |
c599d4d6 PM |
634 | { |
635 | CPUState *cpu = thread_cpu; | |
636 | CPUArchState *env = cpu->env_ptr; | |
637 | target_siginfo_t info; | |
638 | ||
639 | info.si_signo = sig; | |
640 | info.si_errno = 0; | |
641 | info.si_code = TARGET_SI_KERNEL; | |
642 | info._sifields._kill._pid = 0; | |
643 | info._sifields._kill._uid = 0; | |
644 | queue_signal(env, info.si_signo, QEMU_SI_KILL, &info); | |
645 | } | |
09391669 PM |
646 | |
647 | /* Force a SIGSEGV if we couldn't write to memory trying to set | |
648 | * up the signal frame. oldsig is the signal we were trying to handle | |
649 | * at the point of failure. | |
650 | */ | |
47ae93cd | 651 | #if !defined(TARGET_RISCV) |
befb7447 | 652 | void force_sigsegv(int oldsig) |
09391669 | 653 | { |
09391669 PM |
654 | if (oldsig == SIGSEGV) { |
655 | /* Make sure we don't try to deliver the signal again; this will | |
c599d4d6 | 656 | * end up with handle_pending_signal() calling dump_core_and_abort(). |
09391669 PM |
657 | */ |
658 | sigact_table[oldsig - 1]._sa_handler = TARGET_SIG_DFL; | |
659 | } | |
c4b35744 | 660 | force_sig(TARGET_SIGSEGV); |
09391669 | 661 | } |
66fb9763 | 662 | |
47ae93cd MC |
663 | #endif |
664 | ||
9de5e440 | 665 | /* abort execution with signal */ |
c599d4d6 | 666 | static void QEMU_NORETURN dump_core_and_abort(int target_sig) |
66fb9763 | 667 | { |
0429a971 AF |
668 | CPUState *cpu = thread_cpu; |
669 | CPUArchState *env = cpu->env_ptr; | |
670 | TaskState *ts = (TaskState *)cpu->opaque; | |
edf8e2af | 671 | int host_sig, core_dumped = 0; |
603e4fd7 | 672 | struct sigaction act; |
c8ee0a44 | 673 | |
66393fb9 | 674 | host_sig = target_to_host_signal(target_sig); |
c8ee0a44 | 675 | trace_user_force_sig(env, target_sig, host_sig); |
a2247f8e | 676 | gdb_signalled(env, target_sig); |
603e4fd7 | 677 | |
edf8e2af | 678 | /* dump core if supported by target binary format */ |
66393fb9 | 679 | if (core_dump_signal(target_sig) && (ts->bprm->core_dump != NULL)) { |
edf8e2af MW |
680 | stop_all_tasks(); |
681 | core_dumped = | |
a2247f8e | 682 | ((*ts->bprm->core_dump)(target_sig, env) == 0); |
edf8e2af MW |
683 | } |
684 | if (core_dumped) { | |
685 | /* we already dumped the core of target process, we don't want | |
686 | * a coredump of qemu itself */ | |
687 | struct rlimit nodump; | |
688 | getrlimit(RLIMIT_CORE, &nodump); | |
689 | nodump.rlim_cur=0; | |
690 | setrlimit(RLIMIT_CORE, &nodump); | |
691 | (void) fprintf(stderr, "qemu: uncaught target signal %d (%s) - %s\n", | |
66393fb9 | 692 | target_sig, strsignal(host_sig), "core dumped" ); |
edf8e2af MW |
693 | } |
694 | ||
0c58751c | 695 | /* The proper exit code for dying from an uncaught signal is |
603e4fd7 AJ |
696 | * -<signal>. The kernel doesn't allow exit() or _exit() to pass |
697 | * a negative value. To get the proper exit code we need to | |
698 | * actually die from an uncaught signal. Here the default signal | |
699 | * handler is installed, we send ourself a signal and we wait for | |
700 | * it to arrive. */ | |
701 | sigfillset(&act.sa_mask); | |
702 | act.sa_handler = SIG_DFL; | |
3a5d30bf | 703 | act.sa_flags = 0; |
603e4fd7 AJ |
704 | sigaction(host_sig, &act, NULL); |
705 | ||
706 | /* For some reason raise(host_sig) doesn't send the signal when | |
707 | * statically linked on x86-64. */ | |
708 | kill(getpid(), host_sig); | |
709 | ||
710 | /* Make sure the signal isn't masked (just reuse the mask inside | |
711 | of act) */ | |
712 | sigdelset(&act.sa_mask, host_sig); | |
713 | sigsuspend(&act.sa_mask); | |
714 | ||
715 | /* unreachable */ | |
a6c6f76c | 716 | abort(); |
66fb9763 FB |
717 | } |
718 | ||
9de5e440 FB |
719 | /* queue a signal so that it will be send to the virtual CPU as soon |
720 | as possible */ | |
9d2803f7 PM |
721 | int queue_signal(CPUArchState *env, int sig, int si_type, |
722 | target_siginfo_t *info) | |
31e31b8a | 723 | { |
29a0af61 | 724 | CPUState *cpu = env_cpu(env); |
0429a971 | 725 | TaskState *ts = cpu->opaque; |
66fb9763 | 726 | |
c8ee0a44 | 727 | trace_user_queue_signal(env, sig); |
907f5fdd | 728 | |
9d2803f7 | 729 | info->si_code = deposit32(info->si_code, 16, 16, si_type); |
a70dadc7 | 730 | |
655ed67c TB |
731 | ts->sync_signal.info = *info; |
732 | ts->sync_signal.pending = sig; | |
907f5fdd | 733 | /* signal that a new signal is pending */ |
d73415a3 | 734 | qatomic_set(&ts->signal_pending, 1); |
907f5fdd | 735 | return 1; /* indicates that the signal was queued */ |
9de5e440 FB |
736 | } |
737 | ||
4d330cee TB |
738 | #ifndef HAVE_SAFE_SYSCALL |
739 | static inline void rewind_if_in_safe_syscall(void *puc) | |
740 | { | |
741 | /* Default version: never rewind */ | |
742 | } | |
743 | #endif | |
744 | ||
5fafdf24 | 745 | static void host_signal_handler(int host_signum, siginfo_t *info, |
9de5e440 FB |
746 | void *puc) |
747 | { | |
a2247f8e | 748 | CPUArchState *env = thread_cpu->env_ptr; |
29a0af61 | 749 | CPUState *cpu = env_cpu(env); |
655ed67c TB |
750 | TaskState *ts = cpu->opaque; |
751 | ||
9de5e440 | 752 | int sig; |
c227f099 | 753 | target_siginfo_t tinfo; |
3d3efba0 | 754 | ucontext_t *uc = puc; |
655ed67c | 755 | struct emulated_sigtable *k; |
9de5e440 FB |
756 | |
757 | /* the CPU emulator uses some host signals to detect exceptions, | |
eaa449b9 | 758 | we forward to it some signals */ |
ca587a8e | 759 | if ((host_signum == SIGSEGV || host_signum == SIGBUS) |
eaa449b9 | 760 | && info->si_code > 0) { |
b346ff46 | 761 | if (cpu_signal_handler(host_signum, info, puc)) |
9de5e440 FB |
762 | return; |
763 | } | |
764 | ||
765 | /* get target signal number */ | |
766 | sig = host_to_target_signal(host_signum); | |
767 | if (sig < 1 || sig > TARGET_NSIG) | |
768 | return; | |
c8ee0a44 | 769 | trace_user_host_signal(env, host_signum, sig); |
4d330cee TB |
770 | |
771 | rewind_if_in_safe_syscall(puc); | |
772 | ||
9de5e440 | 773 | host_to_target_siginfo_noswap(&tinfo, info); |
655ed67c TB |
774 | k = &ts->sigtab[sig - 1]; |
775 | k->info = tinfo; | |
776 | k->pending = sig; | |
777 | ts->signal_pending = 1; | |
778 | ||
779 | /* Block host signals until target signal handler entered. We | |
780 | * can't block SIGSEGV or SIGBUS while we're executing guest | |
781 | * code in case the guest code provokes one in the window between | |
782 | * now and it getting out to the main loop. Signals will be | |
783 | * unblocked again in process_pending_signals(). | |
1d48fdd9 PM |
784 | * |
785 | * WARNING: we cannot use sigfillset() here because the uc_sigmask | |
786 | * field is a kernel sigset_t, which is much smaller than the | |
787 | * libc sigset_t which sigfillset() operates on. Using sigfillset() | |
788 | * would write 0xff bytes off the end of the structure and trash | |
789 | * data on the struct. | |
790 | * We can't use sizeof(uc->uc_sigmask) either, because the libc | |
791 | * headers define the struct field with the wrong (too large) type. | |
655ed67c | 792 | */ |
1d48fdd9 | 793 | memset(&uc->uc_sigmask, 0xff, SIGSET_T_SIZE); |
655ed67c TB |
794 | sigdelset(&uc->uc_sigmask, SIGSEGV); |
795 | sigdelset(&uc->uc_sigmask, SIGBUS); | |
3d3efba0 | 796 | |
655ed67c TB |
797 | /* interrupt the virtual CPU as soon as possible */ |
798 | cpu_exit(thread_cpu); | |
66fb9763 FB |
799 | } |
800 | ||
0da46a6e | 801 | /* do_sigaltstack() returns target values and errnos. */ |
579a97f7 | 802 | /* compare linux/kernel/signal.c:do_sigaltstack() */ |
6b208755 RH |
803 | abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, |
804 | CPUArchState *env) | |
a04e134a | 805 | { |
92bad948 RH |
806 | target_stack_t oss, *uoss = NULL; |
807 | abi_long ret = -TARGET_EFAULT; | |
a04e134a | 808 | |
92bad948 | 809 | if (uoss_addr) { |
92bad948 RH |
810 | /* Verify writability now, but do not alter user memory yet. */ |
811 | if (!lock_user_struct(VERIFY_WRITE, uoss, uoss_addr, 0)) { | |
812 | goto out; | |
813 | } | |
6b208755 | 814 | target_save_altstack(&oss, env); |
a04e134a TS |
815 | } |
816 | ||
92bad948 RH |
817 | if (uss_addr) { |
818 | target_stack_t *uss; | |
a04e134a | 819 | |
9eeb8306 | 820 | if (!lock_user_struct(VERIFY_READ, uss, uss_addr, 1)) { |
a04e134a | 821 | goto out; |
9eeb8306 | 822 | } |
ddc3e74d | 823 | ret = target_restore_altstack(uss, env); |
92bad948 | 824 | if (ret) { |
a04e134a | 825 | goto out; |
7d37435b | 826 | } |
a04e134a TS |
827 | } |
828 | ||
579a97f7 | 829 | if (uoss_addr) { |
92bad948 RH |
830 | memcpy(uoss, &oss, sizeof(oss)); |
831 | unlock_user_struct(uoss, uoss_addr, 1); | |
832 | uoss = NULL; | |
a04e134a | 833 | } |
a04e134a | 834 | ret = 0; |
92bad948 RH |
835 | |
836 | out: | |
837 | if (uoss) { | |
838 | unlock_user_struct(uoss, uoss_addr, 0); | |
839 | } | |
a04e134a TS |
840 | return ret; |
841 | } | |
842 | ||
ef6a778e | 843 | /* do_sigaction() return target values and host errnos */ |
66fb9763 FB |
844 | int do_sigaction(int sig, const struct target_sigaction *act, |
845 | struct target_sigaction *oact) | |
846 | { | |
624f7979 | 847 | struct target_sigaction *k; |
773b93ee FB |
848 | struct sigaction act1; |
849 | int host_sig; | |
0da46a6e | 850 | int ret = 0; |
66fb9763 | 851 | |
6bc024e7 LV |
852 | trace_signal_do_sigaction_guest(sig, TARGET_NSIG); |
853 | ||
ef6a778e TB |
854 | if (sig < 1 || sig > TARGET_NSIG || sig == TARGET_SIGKILL || sig == TARGET_SIGSTOP) { |
855 | return -TARGET_EINVAL; | |
856 | } | |
857 | ||
858 | if (block_signals()) { | |
859 | return -TARGET_ERESTARTSYS; | |
860 | } | |
861 | ||
66fb9763 | 862 | k = &sigact_table[sig - 1]; |
66fb9763 | 863 | if (oact) { |
d2565875 RH |
864 | __put_user(k->_sa_handler, &oact->_sa_handler); |
865 | __put_user(k->sa_flags, &oact->sa_flags); | |
7f047de1 | 866 | #ifdef TARGET_ARCH_HAS_SA_RESTORER |
d2565875 | 867 | __put_user(k->sa_restorer, &oact->sa_restorer); |
388bb21a | 868 | #endif |
d2565875 | 869 | /* Not swapped. */ |
624f7979 | 870 | oact->sa_mask = k->sa_mask; |
66fb9763 FB |
871 | } |
872 | if (act) { | |
624f7979 | 873 | /* FIXME: This is not threadsafe. */ |
d2565875 RH |
874 | __get_user(k->_sa_handler, &act->_sa_handler); |
875 | __get_user(k->sa_flags, &act->sa_flags); | |
7f047de1 | 876 | #ifdef TARGET_ARCH_HAS_SA_RESTORER |
d2565875 | 877 | __get_user(k->sa_restorer, &act->sa_restorer); |
388bb21a | 878 | #endif |
d2565875 | 879 | /* To be swapped in target_to_host_sigset. */ |
624f7979 | 880 | k->sa_mask = act->sa_mask; |
773b93ee FB |
881 | |
882 | /* we update the host linux signal state */ | |
883 | host_sig = target_to_host_signal(sig); | |
6bc024e7 LV |
884 | trace_signal_do_sigaction_host(host_sig, TARGET_NSIG); |
885 | if (host_sig > SIGRTMAX) { | |
886 | /* we don't have enough host signals to map all target signals */ | |
887 | qemu_log_mask(LOG_UNIMP, "Unsupported target signal #%d, ignored\n", | |
888 | sig); | |
889 | /* | |
890 | * we don't return an error here because some programs try to | |
891 | * register an handler for all possible rt signals even if they | |
892 | * don't need it. | |
893 | * An error here can abort them whereas there can be no problem | |
894 | * to not have the signal available later. | |
895 | * This is the case for golang, | |
896 | * See https://github.com/golang/go/issues/33746 | |
897 | * So we silently ignore the error. | |
898 | */ | |
899 | return 0; | |
900 | } | |
773b93ee FB |
901 | if (host_sig != SIGSEGV && host_sig != SIGBUS) { |
902 | sigfillset(&act1.sa_mask); | |
903 | act1.sa_flags = SA_SIGINFO; | |
624f7979 | 904 | if (k->sa_flags & TARGET_SA_RESTART) |
773b93ee FB |
905 | act1.sa_flags |= SA_RESTART; |
906 | /* NOTE: it is important to update the host kernel signal | |
907 | ignore state to avoid getting unexpected interrupted | |
908 | syscalls */ | |
624f7979 | 909 | if (k->_sa_handler == TARGET_SIG_IGN) { |
773b93ee | 910 | act1.sa_sigaction = (void *)SIG_IGN; |
624f7979 | 911 | } else if (k->_sa_handler == TARGET_SIG_DFL) { |
ca587a8e AJ |
912 | if (fatal_signal (sig)) |
913 | act1.sa_sigaction = host_signal_handler; | |
914 | else | |
915 | act1.sa_sigaction = (void *)SIG_DFL; | |
773b93ee FB |
916 | } else { |
917 | act1.sa_sigaction = host_signal_handler; | |
918 | } | |
0da46a6e | 919 | ret = sigaction(host_sig, &act1, NULL); |
773b93ee | 920 | } |
66fb9763 | 921 | } |
0da46a6e | 922 | return ret; |
66fb9763 FB |
923 | } |
924 | ||
31efaef1 PM |
925 | static void handle_pending_signal(CPUArchState *cpu_env, int sig, |
926 | struct emulated_sigtable *k) | |
eb552501 | 927 | { |
29a0af61 | 928 | CPUState *cpu = env_cpu(cpu_env); |
eb552501 | 929 | abi_ulong handler; |
3d3efba0 | 930 | sigset_t set; |
eb552501 PM |
931 | target_sigset_t target_old_set; |
932 | struct target_sigaction *sa; | |
eb552501 | 933 | TaskState *ts = cpu->opaque; |
66fb9763 | 934 | |
c8ee0a44 | 935 | trace_user_handle_signal(cpu_env, sig); |
66fb9763 | 936 | /* dequeue signal */ |
907f5fdd | 937 | k->pending = 0; |
3b46e624 | 938 | |
db6b81d4 | 939 | sig = gdb_handlesig(cpu, sig); |
1fddef4b | 940 | if (!sig) { |
ca587a8e AJ |
941 | sa = NULL; |
942 | handler = TARGET_SIG_IGN; | |
943 | } else { | |
944 | sa = &sigact_table[sig - 1]; | |
945 | handler = sa->_sa_handler; | |
1fddef4b | 946 | } |
66fb9763 | 947 | |
4b25a506 | 948 | if (unlikely(qemu_loglevel_mask(LOG_STRACE))) { |
0cb581d6 PM |
949 | print_taken_signal(sig, &k->info); |
950 | } | |
951 | ||
66fb9763 | 952 | if (handler == TARGET_SIG_DFL) { |
ca587a8e AJ |
953 | /* default handler : ignore some signal. The other are job control or fatal */ |
954 | if (sig == TARGET_SIGTSTP || sig == TARGET_SIGTTIN || sig == TARGET_SIGTTOU) { | |
955 | kill(getpid(),SIGSTOP); | |
956 | } else if (sig != TARGET_SIGCHLD && | |
957 | sig != TARGET_SIGURG && | |
958 | sig != TARGET_SIGWINCH && | |
959 | sig != TARGET_SIGCONT) { | |
c599d4d6 | 960 | dump_core_and_abort(sig); |
66fb9763 FB |
961 | } |
962 | } else if (handler == TARGET_SIG_IGN) { | |
963 | /* ignore sig */ | |
964 | } else if (handler == TARGET_SIG_ERR) { | |
c599d4d6 | 965 | dump_core_and_abort(sig); |
66fb9763 | 966 | } else { |
9de5e440 | 967 | /* compute the blocked signals during the handler execution */ |
3d3efba0 PM |
968 | sigset_t *blocked_set; |
969 | ||
624f7979 | 970 | target_to_host_sigset(&set, &sa->sa_mask); |
9de5e440 FB |
971 | /* SA_NODEFER indicates that the current signal should not be |
972 | blocked during the handler */ | |
624f7979 | 973 | if (!(sa->sa_flags & TARGET_SA_NODEFER)) |
9de5e440 | 974 | sigaddset(&set, target_to_host_signal(sig)); |
3b46e624 | 975 | |
9de5e440 FB |
976 | /* save the previous blocked signal state to restore it at the |
977 | end of the signal execution (see do_sigreturn) */ | |
3d3efba0 PM |
978 | host_to_target_sigset_internal(&target_old_set, &ts->signal_mask); |
979 | ||
980 | /* block signals in the handler */ | |
981 | blocked_set = ts->in_sigsuspend ? | |
982 | &ts->sigsuspend_mask : &ts->signal_mask; | |
983 | sigorset(&ts->signal_mask, blocked_set, &set); | |
984 | ts->in_sigsuspend = 0; | |
9de5e440 | 985 | |
bc8a22cc | 986 | /* if the CPU is in VM86 mode, we restore the 32 bit values */ |
84409ddb | 987 | #if defined(TARGET_I386) && !defined(TARGET_X86_64) |
bc8a22cc FB |
988 | { |
989 | CPUX86State *env = cpu_env; | |
990 | if (env->eflags & VM_MASK) | |
991 | save_v86_state(env); | |
992 | } | |
993 | #endif | |
9de5e440 | 994 | /* prepare the stack frame of the virtual CPU */ |
cb6ac802 LV |
995 | #if defined(TARGET_ARCH_HAS_SETUP_FRAME) |
996 | if (sa->sa_flags & TARGET_SA_SIGINFO) { | |
907f5fdd | 997 | setup_rt_frame(sig, sa, &k->info, &target_old_set, cpu_env); |
cb6ac802 | 998 | } else { |
624f7979 | 999 | setup_frame(sig, sa, &target_old_set, cpu_env); |
cb6ac802 LV |
1000 | } |
1001 | #else | |
1002 | /* These targets do not have traditional signals. */ | |
1003 | setup_rt_frame(sig, sa, &k->info, &target_old_set, cpu_env); | |
ff970904 | 1004 | #endif |
7ec87e06 | 1005 | if (sa->sa_flags & TARGET_SA_RESETHAND) { |
624f7979 | 1006 | sa->_sa_handler = TARGET_SIG_DFL; |
7ec87e06 | 1007 | } |
31e31b8a | 1008 | } |
66fb9763 | 1009 | } |
e902d588 PM |
1010 | |
1011 | void process_pending_signals(CPUArchState *cpu_env) | |
1012 | { | |
29a0af61 | 1013 | CPUState *cpu = env_cpu(cpu_env); |
e902d588 PM |
1014 | int sig; |
1015 | TaskState *ts = cpu->opaque; | |
3d3efba0 PM |
1016 | sigset_t set; |
1017 | sigset_t *blocked_set; | |
e902d588 | 1018 | |
d73415a3 | 1019 | while (qatomic_read(&ts->signal_pending)) { |
3d3efba0 PM |
1020 | /* FIXME: This is not threadsafe. */ |
1021 | sigfillset(&set); | |
1022 | sigprocmask(SIG_SETMASK, &set, 0); | |
1023 | ||
8bd3773c | 1024 | restart_scan: |
655ed67c TB |
1025 | sig = ts->sync_signal.pending; |
1026 | if (sig) { | |
1027 | /* Synchronous signals are forced, | |
1028 | * see force_sig_info() and callers in Linux | |
1029 | * Note that not all of our queue_signal() calls in QEMU correspond | |
1030 | * to force_sig_info() calls in Linux (some are send_sig_info()). | |
1031 | * However it seems like a kernel bug to me to allow the process | |
1032 | * to block a synchronous signal since it could then just end up | |
1033 | * looping round and round indefinitely. | |
1034 | */ | |
1035 | if (sigismember(&ts->signal_mask, target_to_host_signal_table[sig]) | |
1036 | || sigact_table[sig - 1]._sa_handler == TARGET_SIG_IGN) { | |
1037 | sigdelset(&ts->signal_mask, target_to_host_signal_table[sig]); | |
1038 | sigact_table[sig - 1]._sa_handler = TARGET_SIG_DFL; | |
1039 | } | |
1040 | ||
31efaef1 | 1041 | handle_pending_signal(cpu_env, sig, &ts->sync_signal); |
655ed67c TB |
1042 | } |
1043 | ||
3d3efba0 PM |
1044 | for (sig = 1; sig <= TARGET_NSIG; sig++) { |
1045 | blocked_set = ts->in_sigsuspend ? | |
1046 | &ts->sigsuspend_mask : &ts->signal_mask; | |
1047 | ||
1048 | if (ts->sigtab[sig - 1].pending && | |
1049 | (!sigismember(blocked_set, | |
655ed67c | 1050 | target_to_host_signal_table[sig]))) { |
31efaef1 | 1051 | handle_pending_signal(cpu_env, sig, &ts->sigtab[sig - 1]); |
8bd3773c PM |
1052 | /* Restart scan from the beginning, as handle_pending_signal |
1053 | * might have resulted in a new synchronous signal (eg SIGSEGV). | |
1054 | */ | |
1055 | goto restart_scan; | |
3d3efba0 | 1056 | } |
e902d588 | 1057 | } |
3d3efba0 PM |
1058 | |
1059 | /* if no signal is pending, unblock signals and recheck (the act | |
1060 | * of unblocking might cause us to take another host signal which | |
1061 | * will set signal_pending again). | |
1062 | */ | |
d73415a3 | 1063 | qatomic_set(&ts->signal_pending, 0); |
3d3efba0 PM |
1064 | ts->in_sigsuspend = 0; |
1065 | set = ts->signal_mask; | |
1066 | sigdelset(&set, SIGSEGV); | |
1067 | sigdelset(&set, SIGBUS); | |
1068 | sigprocmask(SIG_SETMASK, &set, 0); | |
1069 | } | |
1070 | ts->in_sigsuspend = 0; | |
e902d588 | 1071 | } |