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Commit | Line | Data |
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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" |
85b4fa0c | 21 | #include "exec/gdbstub.h" |
e6037d04 | 22 | #include "hw/core/tcg-cpu-ops.h" |
85b4fa0c | 23 | |
31e31b8a | 24 | #include <sys/ucontext.h> |
edf8e2af | 25 | #include <sys/resource.h> |
31e31b8a | 26 | |
3ef693a0 | 27 | #include "qemu.h" |
3b249d26 | 28 | #include "user-internals.h" |
a44d57a3 | 29 | #include "strace.h" |
3ad0a769 | 30 | #include "loader.h" |
c8ee0a44 | 31 | #include "trace.h" |
befb7447 | 32 | #include "signal-common.h" |
e6037d04 | 33 | #include "host-signal.h" |
bbf15aaf | 34 | #include "user/safe-syscall.h" |
66fb9763 | 35 | |
624f7979 | 36 | static struct target_sigaction sigact_table[TARGET_NSIG]; |
31e31b8a | 37 | |
5fafdf24 | 38 | static void host_signal_handler(int host_signum, siginfo_t *info, |
66fb9763 FB |
39 | void *puc); |
40 | ||
db2af69d RH |
41 | /* Fallback addresses into sigtramp page. */ |
42 | abi_ulong default_sigreturn; | |
43 | abi_ulong default_rt_sigreturn; | |
9fcff3a6 LV |
44 | |
45 | /* | |
46 | * System includes define _NSIG as SIGRTMAX + 1, | |
47 | * but qemu (like the kernel) defines TARGET_NSIG as TARGET_SIGRTMAX | |
48 | * and the first signal is SIGHUP defined as 1 | |
49 | * Signal number 0 is reserved for use as kill(pid, 0), to test whether | |
50 | * a process exists without sending it a signal. | |
51 | */ | |
144bff03 | 52 | #ifdef __SIGRTMAX |
9fcff3a6 | 53 | QEMU_BUILD_BUG_ON(__SIGRTMAX + 1 != _NSIG); |
144bff03 | 54 | #endif |
3ca05588 | 55 | static uint8_t host_to_target_signal_table[_NSIG] = { |
9e5f5284 FB |
56 | [SIGHUP] = TARGET_SIGHUP, |
57 | [SIGINT] = TARGET_SIGINT, | |
58 | [SIGQUIT] = TARGET_SIGQUIT, | |
59 | [SIGILL] = TARGET_SIGILL, | |
60 | [SIGTRAP] = TARGET_SIGTRAP, | |
61 | [SIGABRT] = TARGET_SIGABRT, | |
01e3b763 | 62 | /* [SIGIOT] = TARGET_SIGIOT,*/ |
9e5f5284 FB |
63 | [SIGBUS] = TARGET_SIGBUS, |
64 | [SIGFPE] = TARGET_SIGFPE, | |
65 | [SIGKILL] = TARGET_SIGKILL, | |
66 | [SIGUSR1] = TARGET_SIGUSR1, | |
67 | [SIGSEGV] = TARGET_SIGSEGV, | |
68 | [SIGUSR2] = TARGET_SIGUSR2, | |
69 | [SIGPIPE] = TARGET_SIGPIPE, | |
70 | [SIGALRM] = TARGET_SIGALRM, | |
71 | [SIGTERM] = TARGET_SIGTERM, | |
72 | #ifdef SIGSTKFLT | |
73 | [SIGSTKFLT] = TARGET_SIGSTKFLT, | |
74 | #endif | |
75 | [SIGCHLD] = TARGET_SIGCHLD, | |
76 | [SIGCONT] = TARGET_SIGCONT, | |
77 | [SIGSTOP] = TARGET_SIGSTOP, | |
78 | [SIGTSTP] = TARGET_SIGTSTP, | |
79 | [SIGTTIN] = TARGET_SIGTTIN, | |
80 | [SIGTTOU] = TARGET_SIGTTOU, | |
81 | [SIGURG] = TARGET_SIGURG, | |
82 | [SIGXCPU] = TARGET_SIGXCPU, | |
83 | [SIGXFSZ] = TARGET_SIGXFSZ, | |
84 | [SIGVTALRM] = TARGET_SIGVTALRM, | |
85 | [SIGPROF] = TARGET_SIGPROF, | |
86 | [SIGWINCH] = TARGET_SIGWINCH, | |
87 | [SIGIO] = TARGET_SIGIO, | |
88 | [SIGPWR] = TARGET_SIGPWR, | |
89 | [SIGSYS] = TARGET_SIGSYS, | |
90 | /* next signals stay the same */ | |
91 | }; | |
9e5f5284 | 92 | |
9fcff3a6 LV |
93 | static uint8_t target_to_host_signal_table[TARGET_NSIG + 1]; |
94 | ||
95 | /* valid sig is between 1 and _NSIG - 1 */ | |
1d9d8b55 | 96 | int host_to_target_signal(int sig) |
31e31b8a | 97 | { |
9fcff3a6 | 98 | if (sig < 1 || sig >= _NSIG) { |
4cb05961 | 99 | return sig; |
9fcff3a6 | 100 | } |
9e5f5284 | 101 | return host_to_target_signal_table[sig]; |
31e31b8a FB |
102 | } |
103 | ||
9fcff3a6 | 104 | /* valid sig is between 1 and TARGET_NSIG */ |
4cb05961 | 105 | int target_to_host_signal(int sig) |
31e31b8a | 106 | { |
9fcff3a6 | 107 | if (sig < 1 || sig > TARGET_NSIG) { |
4cb05961 | 108 | return sig; |
9fcff3a6 | 109 | } |
9e5f5284 | 110 | return target_to_host_signal_table[sig]; |
31e31b8a FB |
111 | } |
112 | ||
c227f099 | 113 | static inline void target_sigaddset(target_sigset_t *set, int signum) |
f5545b5c PB |
114 | { |
115 | signum--; | |
116 | abi_ulong mask = (abi_ulong)1 << (signum % TARGET_NSIG_BPW); | |
117 | set->sig[signum / TARGET_NSIG_BPW] |= mask; | |
118 | } | |
119 | ||
c227f099 | 120 | static inline int target_sigismember(const target_sigset_t *set, int signum) |
f5545b5c PB |
121 | { |
122 | signum--; | |
123 | abi_ulong mask = (abi_ulong)1 << (signum % TARGET_NSIG_BPW); | |
124 | return ((set->sig[signum / TARGET_NSIG_BPW] & mask) != 0); | |
125 | } | |
126 | ||
befb7447 LV |
127 | void host_to_target_sigset_internal(target_sigset_t *d, |
128 | const sigset_t *s) | |
66fb9763 | 129 | { |
9fcff3a6 | 130 | int host_sig, target_sig; |
f5545b5c | 131 | target_sigemptyset(d); |
9fcff3a6 LV |
132 | for (host_sig = 1; host_sig < _NSIG; host_sig++) { |
133 | target_sig = host_to_target_signal(host_sig); | |
134 | if (target_sig < 1 || target_sig > TARGET_NSIG) { | |
135 | continue; | |
136 | } | |
137 | if (sigismember(s, host_sig)) { | |
138 | target_sigaddset(d, target_sig); | |
f5545b5c | 139 | } |
66fb9763 FB |
140 | } |
141 | } | |
142 | ||
c227f099 | 143 | void host_to_target_sigset(target_sigset_t *d, const sigset_t *s) |
9231944d | 144 | { |
c227f099 | 145 | target_sigset_t d1; |
9231944d FB |
146 | int i; |
147 | ||
148 | host_to_target_sigset_internal(&d1, s); | |
149 | for(i = 0;i < TARGET_NSIG_WORDS; i++) | |
cbb21eed | 150 | d->sig[i] = tswapal(d1.sig[i]); |
9231944d FB |
151 | } |
152 | ||
befb7447 LV |
153 | void target_to_host_sigset_internal(sigset_t *d, |
154 | const target_sigset_t *s) | |
66fb9763 | 155 | { |
9fcff3a6 | 156 | int host_sig, target_sig; |
f5545b5c | 157 | sigemptyset(d); |
9fcff3a6 LV |
158 | for (target_sig = 1; target_sig <= TARGET_NSIG; target_sig++) { |
159 | host_sig = target_to_host_signal(target_sig); | |
160 | if (host_sig < 1 || host_sig >= _NSIG) { | |
161 | continue; | |
162 | } | |
163 | if (target_sigismember(s, target_sig)) { | |
164 | sigaddset(d, host_sig); | |
f5545b5c | 165 | } |
da7c8647 | 166 | } |
66fb9763 FB |
167 | } |
168 | ||
c227f099 | 169 | void target_to_host_sigset(sigset_t *d, const target_sigset_t *s) |
9231944d | 170 | { |
c227f099 | 171 | target_sigset_t s1; |
9231944d FB |
172 | int i; |
173 | ||
174 | for(i = 0;i < TARGET_NSIG_WORDS; i++) | |
cbb21eed | 175 | s1.sig[i] = tswapal(s->sig[i]); |
9231944d FB |
176 | target_to_host_sigset_internal(d, &s1); |
177 | } | |
3b46e624 | 178 | |
992f48a0 | 179 | void host_to_target_old_sigset(abi_ulong *old_sigset, |
66fb9763 FB |
180 | const sigset_t *sigset) |
181 | { | |
c227f099 | 182 | target_sigset_t d; |
9e5f5284 FB |
183 | host_to_target_sigset(&d, sigset); |
184 | *old_sigset = d.sig[0]; | |
66fb9763 FB |
185 | } |
186 | ||
5fafdf24 | 187 | void target_to_host_old_sigset(sigset_t *sigset, |
992f48a0 | 188 | const abi_ulong *old_sigset) |
66fb9763 | 189 | { |
c227f099 | 190 | target_sigset_t d; |
9e5f5284 FB |
191 | int i; |
192 | ||
193 | d.sig[0] = *old_sigset; | |
194 | for(i = 1;i < TARGET_NSIG_WORDS; i++) | |
195 | d.sig[i] = 0; | |
196 | target_to_host_sigset(sigset, &d); | |
66fb9763 FB |
197 | } |
198 | ||
3d3efba0 PM |
199 | int block_signals(void) |
200 | { | |
201 | TaskState *ts = (TaskState *)thread_cpu->opaque; | |
202 | sigset_t set; | |
3d3efba0 PM |
203 | |
204 | /* It's OK to block everything including SIGSEGV, because we won't | |
205 | * run any further guest code before unblocking signals in | |
206 | * process_pending_signals(). | |
207 | */ | |
208 | sigfillset(&set); | |
209 | sigprocmask(SIG_SETMASK, &set, 0); | |
210 | ||
d73415a3 | 211 | return qatomic_xchg(&ts->signal_pending, 1); |
3d3efba0 PM |
212 | } |
213 | ||
1c275925 AB |
214 | /* Wrapper for sigprocmask function |
215 | * Emulates a sigprocmask in a safe way for the guest. Note that set and oldset | |
af254a27 | 216 | * are host signal set, not guest ones. Returns -QEMU_ERESTARTSYS if |
3d3efba0 PM |
217 | * a signal was already pending and the syscall must be restarted, or |
218 | * 0 on success. | |
219 | * If set is NULL, this is guaranteed not to fail. | |
1c275925 AB |
220 | */ |
221 | int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset) | |
222 | { | |
3d3efba0 PM |
223 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
224 | ||
225 | if (oldset) { | |
226 | *oldset = ts->signal_mask; | |
227 | } | |
a7ec0f98 PM |
228 | |
229 | if (set) { | |
3d3efba0 | 230 | int i; |
a7ec0f98 | 231 | |
3d3efba0 | 232 | if (block_signals()) { |
af254a27 | 233 | return -QEMU_ERESTARTSYS; |
3d3efba0 | 234 | } |
a7ec0f98 PM |
235 | |
236 | switch (how) { | |
237 | case SIG_BLOCK: | |
3d3efba0 | 238 | sigorset(&ts->signal_mask, &ts->signal_mask, set); |
a7ec0f98 PM |
239 | break; |
240 | case SIG_UNBLOCK: | |
3d3efba0 PM |
241 | for (i = 1; i <= NSIG; ++i) { |
242 | if (sigismember(set, i)) { | |
243 | sigdelset(&ts->signal_mask, i); | |
244 | } | |
a7ec0f98 PM |
245 | } |
246 | break; | |
247 | case SIG_SETMASK: | |
3d3efba0 | 248 | ts->signal_mask = *set; |
a7ec0f98 PM |
249 | break; |
250 | default: | |
251 | g_assert_not_reached(); | |
252 | } | |
a7ec0f98 | 253 | |
3d3efba0 PM |
254 | /* Silently ignore attempts to change blocking status of KILL or STOP */ |
255 | sigdelset(&ts->signal_mask, SIGKILL); | |
256 | sigdelset(&ts->signal_mask, SIGSTOP); | |
a7ec0f98 | 257 | } |
3d3efba0 | 258 | return 0; |
1c275925 AB |
259 | } |
260 | ||
3d3efba0 PM |
261 | /* Just set the guest's signal mask to the specified value; the |
262 | * caller is assumed to have called block_signals() already. | |
263 | */ | |
befb7447 | 264 | void set_sigmask(const sigset_t *set) |
9eede5b6 | 265 | { |
3d3efba0 PM |
266 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
267 | ||
268 | ts->signal_mask = *set; | |
9eede5b6 | 269 | } |
9eede5b6 | 270 | |
465e237b LV |
271 | /* sigaltstack management */ |
272 | ||
273 | int on_sig_stack(unsigned long sp) | |
274 | { | |
5bfce0b7 PM |
275 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
276 | ||
277 | return (sp - ts->sigaltstack_used.ss_sp | |
278 | < ts->sigaltstack_used.ss_size); | |
465e237b LV |
279 | } |
280 | ||
281 | int sas_ss_flags(unsigned long sp) | |
282 | { | |
5bfce0b7 PM |
283 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
284 | ||
285 | return (ts->sigaltstack_used.ss_size == 0 ? SS_DISABLE | |
465e237b LV |
286 | : on_sig_stack(sp) ? SS_ONSTACK : 0); |
287 | } | |
288 | ||
289 | abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka) | |
290 | { | |
291 | /* | |
292 | * This is the X/Open sanctioned signal stack switching. | |
293 | */ | |
5bfce0b7 PM |
294 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
295 | ||
465e237b | 296 | if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) { |
5bfce0b7 | 297 | return ts->sigaltstack_used.ss_sp + ts->sigaltstack_used.ss_size; |
465e237b LV |
298 | } |
299 | return sp; | |
300 | } | |
301 | ||
302 | void target_save_altstack(target_stack_t *uss, CPUArchState *env) | |
303 | { | |
5bfce0b7 PM |
304 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
305 | ||
306 | __put_user(ts->sigaltstack_used.ss_sp, &uss->ss_sp); | |
465e237b | 307 | __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &uss->ss_flags); |
5bfce0b7 | 308 | __put_user(ts->sigaltstack_used.ss_size, &uss->ss_size); |
465e237b LV |
309 | } |
310 | ||
ddc3e74d | 311 | abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env) |
92bad948 RH |
312 | { |
313 | TaskState *ts = (TaskState *)thread_cpu->opaque; | |
314 | size_t minstacksize = TARGET_MINSIGSTKSZ; | |
315 | target_stack_t ss; | |
316 | ||
317 | #if defined(TARGET_PPC64) | |
318 | /* ELF V2 for PPC64 has a 4K minimum stack size for signal handlers */ | |
319 | struct image_info *image = ts->info; | |
320 | if (get_ppc64_abi(image) > 1) { | |
321 | minstacksize = 4096; | |
322 | } | |
323 | #endif | |
324 | ||
325 | __get_user(ss.ss_sp, &uss->ss_sp); | |
326 | __get_user(ss.ss_size, &uss->ss_size); | |
327 | __get_user(ss.ss_flags, &uss->ss_flags); | |
328 | ||
ddc3e74d | 329 | if (on_sig_stack(get_sp_from_cpustate(env))) { |
92bad948 RH |
330 | return -TARGET_EPERM; |
331 | } | |
332 | ||
333 | switch (ss.ss_flags) { | |
334 | default: | |
335 | return -TARGET_EINVAL; | |
336 | ||
337 | case TARGET_SS_DISABLE: | |
338 | ss.ss_size = 0; | |
339 | ss.ss_sp = 0; | |
340 | break; | |
341 | ||
342 | case TARGET_SS_ONSTACK: | |
343 | case 0: | |
344 | if (ss.ss_size < minstacksize) { | |
345 | return -TARGET_ENOMEM; | |
346 | } | |
347 | break; | |
348 | } | |
349 | ||
350 | ts->sigaltstack_used.ss_sp = ss.ss_sp; | |
351 | ts->sigaltstack_used.ss_size = ss.ss_size; | |
352 | return 0; | |
353 | } | |
354 | ||
9de5e440 FB |
355 | /* siginfo conversion */ |
356 | ||
c227f099 | 357 | static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, |
9de5e440 | 358 | const siginfo_t *info) |
66fb9763 | 359 | { |
a05c6409 | 360 | int sig = host_to_target_signal(info->si_signo); |
a70dadc7 PM |
361 | int si_code = info->si_code; |
362 | int si_type; | |
9de5e440 FB |
363 | tinfo->si_signo = sig; |
364 | tinfo->si_errno = 0; | |
afd7cd92 | 365 | tinfo->si_code = info->si_code; |
a05c6409 | 366 | |
55d72a7e PM |
367 | /* This memset serves two purposes: |
368 | * (1) ensure we don't leak random junk to the guest later | |
369 | * (2) placate false positives from gcc about fields | |
370 | * being used uninitialized if it chooses to inline both this | |
371 | * function and tswap_siginfo() into host_to_target_siginfo(). | |
372 | */ | |
373 | memset(tinfo->_sifields._pad, 0, sizeof(tinfo->_sifields._pad)); | |
374 | ||
a70dadc7 PM |
375 | /* This is awkward, because we have to use a combination of |
376 | * the si_code and si_signo to figure out which of the union's | |
377 | * members are valid. (Within the host kernel it is always possible | |
378 | * to tell, but the kernel carefully avoids giving userspace the | |
379 | * high 16 bits of si_code, so we don't have the information to | |
380 | * do this the easy way...) We therefore make our best guess, | |
381 | * bearing in mind that a guest can spoof most of the si_codes | |
382 | * via rt_sigqueueinfo() if it likes. | |
383 | * | |
384 | * Once we have made our guess, we record it in the top 16 bits of | |
385 | * the si_code, so that tswap_siginfo() later can use it. | |
386 | * tswap_siginfo() will strip these top bits out before writing | |
387 | * si_code to the guest (sign-extending the lower bits). | |
388 | */ | |
389 | ||
390 | switch (si_code) { | |
391 | case SI_USER: | |
392 | case SI_TKILL: | |
393 | case SI_KERNEL: | |
394 | /* Sent via kill(), tkill() or tgkill(), or direct from the kernel. | |
395 | * These are the only unspoofable si_code values. | |
396 | */ | |
397 | tinfo->_sifields._kill._pid = info->si_pid; | |
398 | tinfo->_sifields._kill._uid = info->si_uid; | |
399 | si_type = QEMU_SI_KILL; | |
400 | break; | |
401 | default: | |
402 | /* Everything else is spoofable. Make best guess based on signal */ | |
403 | switch (sig) { | |
404 | case TARGET_SIGCHLD: | |
405 | tinfo->_sifields._sigchld._pid = info->si_pid; | |
406 | tinfo->_sifields._sigchld._uid = info->si_uid; | |
139e5de7 MS |
407 | if (si_code == CLD_EXITED) |
408 | tinfo->_sifields._sigchld._status = info->si_status; | |
409 | else | |
410 | tinfo->_sifields._sigchld._status | |
411 | = host_to_target_signal(info->si_status & 0x7f) | |
412 | | (info->si_status & ~0x7f); | |
a70dadc7 PM |
413 | tinfo->_sifields._sigchld._utime = info->si_utime; |
414 | tinfo->_sifields._sigchld._stime = info->si_stime; | |
415 | si_type = QEMU_SI_CHLD; | |
416 | break; | |
417 | case TARGET_SIGIO: | |
418 | tinfo->_sifields._sigpoll._band = info->si_band; | |
419 | tinfo->_sifields._sigpoll._fd = info->si_fd; | |
420 | si_type = QEMU_SI_POLL; | |
421 | break; | |
422 | default: | |
423 | /* Assume a sigqueue()/mq_notify()/rt_sigqueueinfo() source. */ | |
424 | tinfo->_sifields._rt._pid = info->si_pid; | |
425 | tinfo->_sifields._rt._uid = info->si_uid; | |
426 | /* XXX: potential problem if 64 bit */ | |
427 | tinfo->_sifields._rt._sigval.sival_ptr | |
da7c8647 | 428 | = (abi_ulong)(unsigned long)info->si_value.sival_ptr; |
a70dadc7 PM |
429 | si_type = QEMU_SI_RT; |
430 | break; | |
431 | } | |
432 | break; | |
9de5e440 | 433 | } |
a70dadc7 PM |
434 | |
435 | tinfo->si_code = deposit32(si_code, 16, 16, si_type); | |
9de5e440 FB |
436 | } |
437 | ||
befb7447 LV |
438 | void tswap_siginfo(target_siginfo_t *tinfo, |
439 | const target_siginfo_t *info) | |
9de5e440 | 440 | { |
a70dadc7 PM |
441 | int si_type = extract32(info->si_code, 16, 16); |
442 | int si_code = sextract32(info->si_code, 0, 16); | |
443 | ||
444 | __put_user(info->si_signo, &tinfo->si_signo); | |
445 | __put_user(info->si_errno, &tinfo->si_errno); | |
446 | __put_user(si_code, &tinfo->si_code); | |
447 | ||
448 | /* We can use our internal marker of which fields in the structure | |
449 | * are valid, rather than duplicating the guesswork of | |
450 | * host_to_target_siginfo_noswap() here. | |
451 | */ | |
452 | switch (si_type) { | |
453 | case QEMU_SI_KILL: | |
454 | __put_user(info->_sifields._kill._pid, &tinfo->_sifields._kill._pid); | |
455 | __put_user(info->_sifields._kill._uid, &tinfo->_sifields._kill._uid); | |
456 | break; | |
457 | case QEMU_SI_TIMER: | |
458 | __put_user(info->_sifields._timer._timer1, | |
459 | &tinfo->_sifields._timer._timer1); | |
460 | __put_user(info->_sifields._timer._timer2, | |
461 | &tinfo->_sifields._timer._timer2); | |
462 | break; | |
463 | case QEMU_SI_POLL: | |
464 | __put_user(info->_sifields._sigpoll._band, | |
465 | &tinfo->_sifields._sigpoll._band); | |
466 | __put_user(info->_sifields._sigpoll._fd, | |
467 | &tinfo->_sifields._sigpoll._fd); | |
468 | break; | |
469 | case QEMU_SI_FAULT: | |
470 | __put_user(info->_sifields._sigfault._addr, | |
471 | &tinfo->_sifields._sigfault._addr); | |
472 | break; | |
473 | case QEMU_SI_CHLD: | |
474 | __put_user(info->_sifields._sigchld._pid, | |
475 | &tinfo->_sifields._sigchld._pid); | |
476 | __put_user(info->_sifields._sigchld._uid, | |
477 | &tinfo->_sifields._sigchld._uid); | |
478 | __put_user(info->_sifields._sigchld._status, | |
479 | &tinfo->_sifields._sigchld._status); | |
480 | __put_user(info->_sifields._sigchld._utime, | |
481 | &tinfo->_sifields._sigchld._utime); | |
482 | __put_user(info->_sifields._sigchld._stime, | |
483 | &tinfo->_sifields._sigchld._stime); | |
484 | break; | |
485 | case QEMU_SI_RT: | |
486 | __put_user(info->_sifields._rt._pid, &tinfo->_sifields._rt._pid); | |
487 | __put_user(info->_sifields._rt._uid, &tinfo->_sifields._rt._uid); | |
488 | __put_user(info->_sifields._rt._sigval.sival_ptr, | |
489 | &tinfo->_sifields._rt._sigval.sival_ptr); | |
490 | break; | |
491 | default: | |
492 | g_assert_not_reached(); | |
9de5e440 FB |
493 | } |
494 | } | |
495 | ||
c227f099 | 496 | void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info) |
9de5e440 | 497 | { |
55d72a7e PM |
498 | target_siginfo_t tgt_tmp; |
499 | host_to_target_siginfo_noswap(&tgt_tmp, info); | |
500 | tswap_siginfo(tinfo, &tgt_tmp); | |
66fb9763 FB |
501 | } |
502 | ||
9de5e440 | 503 | /* XXX: we support only POSIX RT signals are used. */ |
aa1f17c1 | 504 | /* XXX: find a solution for 64 bit (additional malloced data is needed) */ |
c227f099 | 505 | void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo) |
66fb9763 | 506 | { |
90c0f080 PM |
507 | /* This conversion is used only for the rt_sigqueueinfo syscall, |
508 | * and so we know that the _rt fields are the valid ones. | |
509 | */ | |
510 | abi_ulong sival_ptr; | |
511 | ||
512 | __get_user(info->si_signo, &tinfo->si_signo); | |
513 | __get_user(info->si_errno, &tinfo->si_errno); | |
514 | __get_user(info->si_code, &tinfo->si_code); | |
515 | __get_user(info->si_pid, &tinfo->_sifields._rt._pid); | |
516 | __get_user(info->si_uid, &tinfo->_sifields._rt._uid); | |
517 | __get_user(sival_ptr, &tinfo->_sifields._rt._sigval.sival_ptr); | |
518 | info->si_value.sival_ptr = (void *)(long)sival_ptr; | |
66fb9763 FB |
519 | } |
520 | ||
ca587a8e AJ |
521 | static int fatal_signal (int sig) |
522 | { | |
523 | switch (sig) { | |
524 | case TARGET_SIGCHLD: | |
525 | case TARGET_SIGURG: | |
526 | case TARGET_SIGWINCH: | |
527 | /* Ignored by default. */ | |
528 | return 0; | |
529 | case TARGET_SIGCONT: | |
530 | case TARGET_SIGSTOP: | |
531 | case TARGET_SIGTSTP: | |
532 | case TARGET_SIGTTIN: | |
533 | case TARGET_SIGTTOU: | |
534 | /* Job control signals. */ | |
535 | return 0; | |
536 | default: | |
537 | return 1; | |
538 | } | |
539 | } | |
540 | ||
edf8e2af MW |
541 | /* returns 1 if given signal should dump core if not handled */ |
542 | static int core_dump_signal(int sig) | |
543 | { | |
544 | switch (sig) { | |
545 | case TARGET_SIGABRT: | |
546 | case TARGET_SIGFPE: | |
547 | case TARGET_SIGILL: | |
548 | case TARGET_SIGQUIT: | |
549 | case TARGET_SIGSEGV: | |
550 | case TARGET_SIGTRAP: | |
551 | case TARGET_SIGBUS: | |
552 | return (1); | |
553 | default: | |
554 | return (0); | |
555 | } | |
556 | } | |
557 | ||
365510fb LV |
558 | static void signal_table_init(void) |
559 | { | |
6bc024e7 | 560 | int host_sig, target_sig, count; |
365510fb LV |
561 | |
562 | /* | |
6bc024e7 LV |
563 | * Signals are supported starting from TARGET_SIGRTMIN and going up |
564 | * until we run out of host realtime signals. | |
565 | * glibc at least uses only the lower 2 rt signals and probably | |
566 | * nobody's using the upper ones. | |
567 | * it's why SIGRTMIN (34) is generally greater than __SIGRTMIN (32) | |
365510fb LV |
568 | * To fix this properly we need to do manual signal delivery multiplexed |
569 | * over a single host signal. | |
6bc024e7 LV |
570 | * Attempts for configure "missing" signals via sigaction will be |
571 | * silently ignored. | |
365510fb | 572 | */ |
6bc024e7 LV |
573 | for (host_sig = SIGRTMIN; host_sig <= SIGRTMAX; host_sig++) { |
574 | target_sig = host_sig - SIGRTMIN + TARGET_SIGRTMIN; | |
575 | if (target_sig <= TARGET_NSIG) { | |
576 | host_to_target_signal_table[host_sig] = target_sig; | |
577 | } | |
578 | } | |
365510fb LV |
579 | |
580 | /* generate signal conversion tables */ | |
6bc024e7 LV |
581 | for (target_sig = 1; target_sig <= TARGET_NSIG; target_sig++) { |
582 | target_to_host_signal_table[target_sig] = _NSIG; /* poison */ | |
583 | } | |
365510fb LV |
584 | for (host_sig = 1; host_sig < _NSIG; host_sig++) { |
585 | if (host_to_target_signal_table[host_sig] == 0) { | |
586 | host_to_target_signal_table[host_sig] = host_sig; | |
587 | } | |
365510fb | 588 | target_sig = host_to_target_signal_table[host_sig]; |
9fcff3a6 LV |
589 | if (target_sig <= TARGET_NSIG) { |
590 | target_to_host_signal_table[target_sig] = host_sig; | |
591 | } | |
365510fb | 592 | } |
6bc024e7 LV |
593 | |
594 | if (trace_event_get_state_backends(TRACE_SIGNAL_TABLE_INIT)) { | |
595 | for (target_sig = 1, count = 0; target_sig <= TARGET_NSIG; target_sig++) { | |
596 | if (target_to_host_signal_table[target_sig] == _NSIG) { | |
597 | count++; | |
598 | } | |
599 | } | |
600 | trace_signal_table_init(count); | |
601 | } | |
365510fb LV |
602 | } |
603 | ||
31e31b8a FB |
604 | void signal_init(void) |
605 | { | |
3d3efba0 | 606 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
31e31b8a | 607 | struct sigaction act; |
624f7979 | 608 | struct sigaction oact; |
365510fb | 609 | int i; |
624f7979 | 610 | int host_sig; |
31e31b8a | 611 | |
365510fb LV |
612 | /* initialize signal conversion tables */ |
613 | signal_table_init(); | |
3b46e624 | 614 | |
3d3efba0 PM |
615 | /* Set the signal mask from the host mask. */ |
616 | sigprocmask(0, 0, &ts->signal_mask); | |
617 | ||
9de5e440 | 618 | sigfillset(&act.sa_mask); |
31e31b8a FB |
619 | act.sa_flags = SA_SIGINFO; |
620 | act.sa_sigaction = host_signal_handler; | |
624f7979 | 621 | for(i = 1; i <= TARGET_NSIG; i++) { |
4cc600d2 | 622 | #ifdef CONFIG_GPROF |
9fcff3a6 | 623 | if (i == TARGET_SIGPROF) { |
716cdbe0 AB |
624 | continue; |
625 | } | |
626 | #endif | |
624f7979 PB |
627 | host_sig = target_to_host_signal(i); |
628 | sigaction(host_sig, NULL, &oact); | |
629 | if (oact.sa_sigaction == (void *)SIG_IGN) { | |
630 | sigact_table[i - 1]._sa_handler = TARGET_SIG_IGN; | |
631 | } else if (oact.sa_sigaction == (void *)SIG_DFL) { | |
632 | sigact_table[i - 1]._sa_handler = TARGET_SIG_DFL; | |
633 | } | |
634 | /* If there's already a handler installed then something has | |
635 | gone horribly wrong, so don't even try to handle that case. */ | |
ca587a8e AJ |
636 | /* Install some handlers for our own use. We need at least |
637 | SIGSEGV and SIGBUS, to detect exceptions. We can not just | |
638 | trap all signals because it affects syscall interrupt | |
639 | behavior. But do trap all default-fatal signals. */ | |
640 | if (fatal_signal (i)) | |
624f7979 | 641 | sigaction(host_sig, &act, NULL); |
31e31b8a | 642 | } |
66fb9763 FB |
643 | } |
644 | ||
c599d4d6 PM |
645 | /* Force a synchronously taken signal. The kernel force_sig() function |
646 | * also forces the signal to "not blocked, not ignored", but for QEMU | |
647 | * that work is done in process_pending_signals(). | |
648 | */ | |
befb7447 | 649 | void force_sig(int sig) |
c599d4d6 PM |
650 | { |
651 | CPUState *cpu = thread_cpu; | |
652 | CPUArchState *env = cpu->env_ptr; | |
819121b9 | 653 | target_siginfo_t info = {}; |
c599d4d6 PM |
654 | |
655 | info.si_signo = sig; | |
656 | info.si_errno = 0; | |
657 | info.si_code = TARGET_SI_KERNEL; | |
658 | info._sifields._kill._pid = 0; | |
659 | info._sifields._kill._uid = 0; | |
660 | queue_signal(env, info.si_signo, QEMU_SI_KILL, &info); | |
661 | } | |
09391669 | 662 | |
af796960 PM |
663 | /* |
664 | * Force a synchronously taken QEMU_SI_FAULT signal. For QEMU the | |
665 | * 'force' part is handled in process_pending_signals(). | |
666 | */ | |
667 | void force_sig_fault(int sig, int code, abi_ulong addr) | |
668 | { | |
669 | CPUState *cpu = thread_cpu; | |
670 | CPUArchState *env = cpu->env_ptr; | |
671 | target_siginfo_t info = {}; | |
672 | ||
673 | info.si_signo = sig; | |
674 | info.si_errno = 0; | |
675 | info.si_code = code; | |
676 | info._sifields._sigfault._addr = addr; | |
677 | queue_signal(env, sig, QEMU_SI_FAULT, &info); | |
678 | } | |
679 | ||
09391669 PM |
680 | /* Force a SIGSEGV if we couldn't write to memory trying to set |
681 | * up the signal frame. oldsig is the signal we were trying to handle | |
682 | * at the point of failure. | |
683 | */ | |
47ae93cd | 684 | #if !defined(TARGET_RISCV) |
befb7447 | 685 | void force_sigsegv(int oldsig) |
09391669 | 686 | { |
09391669 PM |
687 | if (oldsig == SIGSEGV) { |
688 | /* Make sure we don't try to deliver the signal again; this will | |
c599d4d6 | 689 | * end up with handle_pending_signal() calling dump_core_and_abort(). |
09391669 PM |
690 | */ |
691 | sigact_table[oldsig - 1]._sa_handler = TARGET_SIG_DFL; | |
692 | } | |
c4b35744 | 693 | force_sig(TARGET_SIGSEGV); |
09391669 | 694 | } |
47ae93cd MC |
695 | #endif |
696 | ||
72d2bbf9 RH |
697 | void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr, |
698 | MMUAccessType access_type, bool maperr, uintptr_t ra) | |
699 | { | |
700 | const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops; | |
701 | ||
702 | if (tcg_ops->record_sigsegv) { | |
703 | tcg_ops->record_sigsegv(cpu, addr, access_type, maperr, ra); | |
72d2bbf9 RH |
704 | } |
705 | ||
706 | force_sig_fault(TARGET_SIGSEGV, | |
707 | maperr ? TARGET_SEGV_MAPERR : TARGET_SEGV_ACCERR, | |
708 | addr); | |
709 | cpu->exception_index = EXCP_INTERRUPT; | |
710 | cpu_loop_exit_restore(cpu, ra); | |
711 | } | |
712 | ||
12ed5640 RH |
713 | void cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr, |
714 | MMUAccessType access_type, uintptr_t ra) | |
715 | { | |
716 | const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops; | |
717 | ||
718 | if (tcg_ops->record_sigbus) { | |
719 | tcg_ops->record_sigbus(cpu, addr, access_type, ra); | |
720 | } | |
721 | ||
722 | force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, addr); | |
723 | cpu->exception_index = EXCP_INTERRUPT; | |
724 | cpu_loop_exit_restore(cpu, ra); | |
725 | } | |
726 | ||
9de5e440 | 727 | /* abort execution with signal */ |
8905770b MAL |
728 | static G_NORETURN |
729 | void dump_core_and_abort(int target_sig) | |
66fb9763 | 730 | { |
0429a971 AF |
731 | CPUState *cpu = thread_cpu; |
732 | CPUArchState *env = cpu->env_ptr; | |
733 | TaskState *ts = (TaskState *)cpu->opaque; | |
edf8e2af | 734 | int host_sig, core_dumped = 0; |
603e4fd7 | 735 | struct sigaction act; |
c8ee0a44 | 736 | |
66393fb9 | 737 | host_sig = target_to_host_signal(target_sig); |
b5f95366 | 738 | trace_user_dump_core_and_abort(env, target_sig, host_sig); |
a2247f8e | 739 | gdb_signalled(env, target_sig); |
603e4fd7 | 740 | |
edf8e2af | 741 | /* dump core if supported by target binary format */ |
66393fb9 | 742 | if (core_dump_signal(target_sig) && (ts->bprm->core_dump != NULL)) { |
edf8e2af MW |
743 | stop_all_tasks(); |
744 | core_dumped = | |
a2247f8e | 745 | ((*ts->bprm->core_dump)(target_sig, env) == 0); |
edf8e2af MW |
746 | } |
747 | if (core_dumped) { | |
748 | /* we already dumped the core of target process, we don't want | |
749 | * a coredump of qemu itself */ | |
750 | struct rlimit nodump; | |
751 | getrlimit(RLIMIT_CORE, &nodump); | |
752 | nodump.rlim_cur=0; | |
753 | setrlimit(RLIMIT_CORE, &nodump); | |
754 | (void) fprintf(stderr, "qemu: uncaught target signal %d (%s) - %s\n", | |
66393fb9 | 755 | target_sig, strsignal(host_sig), "core dumped" ); |
edf8e2af MW |
756 | } |
757 | ||
0c58751c | 758 | /* The proper exit code for dying from an uncaught signal is |
603e4fd7 AJ |
759 | * -<signal>. The kernel doesn't allow exit() or _exit() to pass |
760 | * a negative value. To get the proper exit code we need to | |
761 | * actually die from an uncaught signal. Here the default signal | |
762 | * handler is installed, we send ourself a signal and we wait for | |
763 | * it to arrive. */ | |
764 | sigfillset(&act.sa_mask); | |
765 | act.sa_handler = SIG_DFL; | |
3a5d30bf | 766 | act.sa_flags = 0; |
603e4fd7 AJ |
767 | sigaction(host_sig, &act, NULL); |
768 | ||
769 | /* For some reason raise(host_sig) doesn't send the signal when | |
770 | * statically linked on x86-64. */ | |
771 | kill(getpid(), host_sig); | |
772 | ||
773 | /* Make sure the signal isn't masked (just reuse the mask inside | |
774 | of act) */ | |
775 | sigdelset(&act.sa_mask, host_sig); | |
776 | sigsuspend(&act.sa_mask); | |
777 | ||
778 | /* unreachable */ | |
a6c6f76c | 779 | abort(); |
66fb9763 FB |
780 | } |
781 | ||
9de5e440 FB |
782 | /* queue a signal so that it will be send to the virtual CPU as soon |
783 | as possible */ | |
337e88d8 PM |
784 | void queue_signal(CPUArchState *env, int sig, int si_type, |
785 | target_siginfo_t *info) | |
31e31b8a | 786 | { |
29a0af61 | 787 | CPUState *cpu = env_cpu(env); |
0429a971 | 788 | TaskState *ts = cpu->opaque; |
66fb9763 | 789 | |
c8ee0a44 | 790 | trace_user_queue_signal(env, sig); |
907f5fdd | 791 | |
9d2803f7 | 792 | info->si_code = deposit32(info->si_code, 16, 16, si_type); |
a70dadc7 | 793 | |
655ed67c TB |
794 | ts->sync_signal.info = *info; |
795 | ts->sync_signal.pending = sig; | |
907f5fdd | 796 | /* signal that a new signal is pending */ |
d73415a3 | 797 | qatomic_set(&ts->signal_pending, 1); |
9de5e440 FB |
798 | } |
799 | ||
07637888 WL |
800 | |
801 | /* Adjust the signal context to rewind out of safe-syscall if we're in it */ | |
4d330cee TB |
802 | static inline void rewind_if_in_safe_syscall(void *puc) |
803 | { | |
9940799b | 804 | host_sigcontext *uc = (host_sigcontext *)puc; |
07637888 WL |
805 | uintptr_t pcreg = host_signal_pc(uc); |
806 | ||
807 | if (pcreg > (uintptr_t)safe_syscall_start | |
808 | && pcreg < (uintptr_t)safe_syscall_end) { | |
809 | host_signal_set_pc(uc, (uintptr_t)safe_syscall_start); | |
810 | } | |
07637888 | 811 | } |
4d330cee | 812 | |
e6037d04 | 813 | static void host_signal_handler(int host_sig, siginfo_t *info, void *puc) |
9de5e440 | 814 | { |
a2247f8e | 815 | CPUArchState *env = thread_cpu->env_ptr; |
29a0af61 | 816 | CPUState *cpu = env_cpu(env); |
655ed67c | 817 | TaskState *ts = cpu->opaque; |
c227f099 | 818 | target_siginfo_t tinfo; |
9940799b | 819 | host_sigcontext *uc = puc; |
655ed67c | 820 | struct emulated_sigtable *k; |
e6037d04 | 821 | int guest_sig; |
e6037d04 RH |
822 | uintptr_t pc = 0; |
823 | bool sync_sig = false; | |
c8c89a6a | 824 | void *sigmask = host_signal_mask(uc); |
e6037d04 RH |
825 | |
826 | /* | |
827 | * Non-spoofed SIGSEGV and SIGBUS are synchronous, and need special | |
828 | * handling wrt signal blocking and unwinding. | |
829 | */ | |
830 | if ((host_sig == SIGSEGV || host_sig == SIGBUS) && info->si_code > 0) { | |
831 | MMUAccessType access_type; | |
832 | uintptr_t host_addr; | |
833 | abi_ptr guest_addr; | |
834 | bool is_write; | |
835 | ||
836 | host_addr = (uintptr_t)info->si_addr; | |
837 | ||
838 | /* | |
839 | * Convert forcefully to guest address space: addresses outside | |
840 | * reserved_va are still valid to report via SEGV_MAPERR. | |
841 | */ | |
842 | guest_addr = h2g_nocheck(host_addr); | |
843 | ||
844 | pc = host_signal_pc(uc); | |
845 | is_write = host_signal_write(info, uc); | |
846 | access_type = adjust_signal_pc(&pc, is_write); | |
847 | ||
848 | if (host_sig == SIGSEGV) { | |
72d2bbf9 | 849 | bool maperr = true; |
e6037d04 RH |
850 | |
851 | if (info->si_code == SEGV_ACCERR && h2g_valid(host_addr)) { | |
852 | /* If this was a write to a TB protected page, restart. */ | |
853 | if (is_write && | |
c8c89a6a | 854 | handle_sigsegv_accerr_write(cpu, sigmask, pc, guest_addr)) { |
e6037d04 RH |
855 | return; |
856 | } | |
857 | ||
858 | /* | |
859 | * With reserved_va, the whole address space is PROT_NONE, | |
860 | * which means that we may get ACCERR when we want MAPERR. | |
861 | */ | |
862 | if (page_get_flags(guest_addr) & PAGE_VALID) { | |
72d2bbf9 | 863 | maperr = false; |
e6037d04 RH |
864 | } else { |
865 | info->si_code = SEGV_MAPERR; | |
866 | } | |
867 | } | |
868 | ||
c8c89a6a | 869 | sigprocmask(SIG_SETMASK, sigmask, NULL); |
72d2bbf9 | 870 | cpu_loop_exit_sigsegv(cpu, guest_addr, access_type, maperr, pc); |
e6037d04 | 871 | } else { |
c8c89a6a | 872 | sigprocmask(SIG_SETMASK, sigmask, NULL); |
742f0762 RH |
873 | if (info->si_code == BUS_ADRALN) { |
874 | cpu_loop_exit_sigbus(cpu, guest_addr, access_type, pc); | |
875 | } | |
e6037d04 RH |
876 | } |
877 | ||
878 | sync_sig = true; | |
9de5e440 FB |
879 | } |
880 | ||
881 | /* get target signal number */ | |
e6037d04 RH |
882 | guest_sig = host_to_target_signal(host_sig); |
883 | if (guest_sig < 1 || guest_sig > TARGET_NSIG) { | |
9de5e440 | 884 | return; |
e6037d04 RH |
885 | } |
886 | trace_user_host_signal(env, host_sig, guest_sig); | |
4d330cee | 887 | |
9de5e440 | 888 | host_to_target_siginfo_noswap(&tinfo, info); |
e6037d04 | 889 | k = &ts->sigtab[guest_sig - 1]; |
655ed67c | 890 | k->info = tinfo; |
e6037d04 | 891 | k->pending = guest_sig; |
655ed67c TB |
892 | ts->signal_pending = 1; |
893 | ||
e6037d04 RH |
894 | /* |
895 | * For synchronous signals, unwind the cpu state to the faulting | |
896 | * insn and then exit back to the main loop so that the signal | |
897 | * is delivered immediately. | |
898 | */ | |
899 | if (sync_sig) { | |
900 | cpu->exception_index = EXCP_INTERRUPT; | |
901 | cpu_loop_exit_restore(cpu, pc); | |
902 | } | |
e6037d04 RH |
903 | |
904 | rewind_if_in_safe_syscall(puc); | |
905 | ||
906 | /* | |
907 | * Block host signals until target signal handler entered. We | |
655ed67c TB |
908 | * can't block SIGSEGV or SIGBUS while we're executing guest |
909 | * code in case the guest code provokes one in the window between | |
910 | * now and it getting out to the main loop. Signals will be | |
911 | * unblocked again in process_pending_signals(). | |
1d48fdd9 | 912 | * |
c8c89a6a | 913 | * WARNING: we cannot use sigfillset() here because the sigmask |
1d48fdd9 PM |
914 | * field is a kernel sigset_t, which is much smaller than the |
915 | * libc sigset_t which sigfillset() operates on. Using sigfillset() | |
916 | * would write 0xff bytes off the end of the structure and trash | |
917 | * data on the struct. | |
655ed67c | 918 | */ |
c8c89a6a RH |
919 | memset(sigmask, 0xff, SIGSET_T_SIZE); |
920 | sigdelset(sigmask, SIGSEGV); | |
921 | sigdelset(sigmask, SIGBUS); | |
3d3efba0 | 922 | |
655ed67c TB |
923 | /* interrupt the virtual CPU as soon as possible */ |
924 | cpu_exit(thread_cpu); | |
66fb9763 FB |
925 | } |
926 | ||
0da46a6e | 927 | /* do_sigaltstack() returns target values and errnos. */ |
579a97f7 | 928 | /* compare linux/kernel/signal.c:do_sigaltstack() */ |
6b208755 RH |
929 | abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, |
930 | CPUArchState *env) | |
a04e134a | 931 | { |
92bad948 RH |
932 | target_stack_t oss, *uoss = NULL; |
933 | abi_long ret = -TARGET_EFAULT; | |
a04e134a | 934 | |
92bad948 | 935 | if (uoss_addr) { |
92bad948 RH |
936 | /* Verify writability now, but do not alter user memory yet. */ |
937 | if (!lock_user_struct(VERIFY_WRITE, uoss, uoss_addr, 0)) { | |
938 | goto out; | |
939 | } | |
6b208755 | 940 | target_save_altstack(&oss, env); |
a04e134a TS |
941 | } |
942 | ||
92bad948 RH |
943 | if (uss_addr) { |
944 | target_stack_t *uss; | |
a04e134a | 945 | |
9eeb8306 | 946 | if (!lock_user_struct(VERIFY_READ, uss, uss_addr, 1)) { |
a04e134a | 947 | goto out; |
9eeb8306 | 948 | } |
ddc3e74d | 949 | ret = target_restore_altstack(uss, env); |
92bad948 | 950 | if (ret) { |
a04e134a | 951 | goto out; |
7d37435b | 952 | } |
a04e134a TS |
953 | } |
954 | ||
579a97f7 | 955 | if (uoss_addr) { |
92bad948 RH |
956 | memcpy(uoss, &oss, sizeof(oss)); |
957 | unlock_user_struct(uoss, uoss_addr, 1); | |
958 | uoss = NULL; | |
a04e134a | 959 | } |
a04e134a | 960 | ret = 0; |
92bad948 RH |
961 | |
962 | out: | |
963 | if (uoss) { | |
964 | unlock_user_struct(uoss, uoss_addr, 0); | |
965 | } | |
a04e134a TS |
966 | return ret; |
967 | } | |
968 | ||
ef6a778e | 969 | /* do_sigaction() return target values and host errnos */ |
66fb9763 | 970 | int do_sigaction(int sig, const struct target_sigaction *act, |
02fb28e8 | 971 | struct target_sigaction *oact, abi_ulong ka_restorer) |
66fb9763 | 972 | { |
624f7979 | 973 | struct target_sigaction *k; |
773b93ee FB |
974 | struct sigaction act1; |
975 | int host_sig; | |
0da46a6e | 976 | int ret = 0; |
66fb9763 | 977 | |
6bc024e7 LV |
978 | trace_signal_do_sigaction_guest(sig, TARGET_NSIG); |
979 | ||
ee3500d3 IL |
980 | if (sig < 1 || sig > TARGET_NSIG) { |
981 | return -TARGET_EINVAL; | |
982 | } | |
983 | ||
984 | if (act && (sig == TARGET_SIGKILL || sig == TARGET_SIGSTOP)) { | |
ef6a778e TB |
985 | return -TARGET_EINVAL; |
986 | } | |
987 | ||
988 | if (block_signals()) { | |
af254a27 | 989 | return -QEMU_ERESTARTSYS; |
ef6a778e TB |
990 | } |
991 | ||
66fb9763 | 992 | k = &sigact_table[sig - 1]; |
66fb9763 | 993 | if (oact) { |
d2565875 RH |
994 | __put_user(k->_sa_handler, &oact->_sa_handler); |
995 | __put_user(k->sa_flags, &oact->sa_flags); | |
7f047de1 | 996 | #ifdef TARGET_ARCH_HAS_SA_RESTORER |
d2565875 | 997 | __put_user(k->sa_restorer, &oact->sa_restorer); |
388bb21a | 998 | #endif |
d2565875 | 999 | /* Not swapped. */ |
624f7979 | 1000 | oact->sa_mask = k->sa_mask; |
66fb9763 FB |
1001 | } |
1002 | if (act) { | |
d2565875 RH |
1003 | __get_user(k->_sa_handler, &act->_sa_handler); |
1004 | __get_user(k->sa_flags, &act->sa_flags); | |
7f047de1 | 1005 | #ifdef TARGET_ARCH_HAS_SA_RESTORER |
d2565875 | 1006 | __get_user(k->sa_restorer, &act->sa_restorer); |
02fb28e8 RH |
1007 | #endif |
1008 | #ifdef TARGET_ARCH_HAS_KA_RESTORER | |
1009 | k->ka_restorer = ka_restorer; | |
388bb21a | 1010 | #endif |
d2565875 | 1011 | /* To be swapped in target_to_host_sigset. */ |
624f7979 | 1012 | k->sa_mask = act->sa_mask; |
773b93ee FB |
1013 | |
1014 | /* we update the host linux signal state */ | |
1015 | host_sig = target_to_host_signal(sig); | |
6bc024e7 LV |
1016 | trace_signal_do_sigaction_host(host_sig, TARGET_NSIG); |
1017 | if (host_sig > SIGRTMAX) { | |
1018 | /* we don't have enough host signals to map all target signals */ | |
1019 | qemu_log_mask(LOG_UNIMP, "Unsupported target signal #%d, ignored\n", | |
1020 | sig); | |
1021 | /* | |
1022 | * we don't return an error here because some programs try to | |
1023 | * register an handler for all possible rt signals even if they | |
1024 | * don't need it. | |
1025 | * An error here can abort them whereas there can be no problem | |
1026 | * to not have the signal available later. | |
1027 | * This is the case for golang, | |
1028 | * See https://github.com/golang/go/issues/33746 | |
1029 | * So we silently ignore the error. | |
1030 | */ | |
1031 | return 0; | |
1032 | } | |
773b93ee FB |
1033 | if (host_sig != SIGSEGV && host_sig != SIGBUS) { |
1034 | sigfillset(&act1.sa_mask); | |
1035 | act1.sa_flags = SA_SIGINFO; | |
624f7979 | 1036 | if (k->sa_flags & TARGET_SA_RESTART) |
773b93ee FB |
1037 | act1.sa_flags |= SA_RESTART; |
1038 | /* NOTE: it is important to update the host kernel signal | |
1039 | ignore state to avoid getting unexpected interrupted | |
1040 | syscalls */ | |
624f7979 | 1041 | if (k->_sa_handler == TARGET_SIG_IGN) { |
773b93ee | 1042 | act1.sa_sigaction = (void *)SIG_IGN; |
624f7979 | 1043 | } else if (k->_sa_handler == TARGET_SIG_DFL) { |
ca587a8e AJ |
1044 | if (fatal_signal (sig)) |
1045 | act1.sa_sigaction = host_signal_handler; | |
1046 | else | |
1047 | act1.sa_sigaction = (void *)SIG_DFL; | |
773b93ee FB |
1048 | } else { |
1049 | act1.sa_sigaction = host_signal_handler; | |
1050 | } | |
0da46a6e | 1051 | ret = sigaction(host_sig, &act1, NULL); |
773b93ee | 1052 | } |
66fb9763 | 1053 | } |
0da46a6e | 1054 | return ret; |
66fb9763 FB |
1055 | } |
1056 | ||
31efaef1 PM |
1057 | static void handle_pending_signal(CPUArchState *cpu_env, int sig, |
1058 | struct emulated_sigtable *k) | |
eb552501 | 1059 | { |
29a0af61 | 1060 | CPUState *cpu = env_cpu(cpu_env); |
eb552501 | 1061 | abi_ulong handler; |
3d3efba0 | 1062 | sigset_t set; |
eb552501 PM |
1063 | target_sigset_t target_old_set; |
1064 | struct target_sigaction *sa; | |
eb552501 | 1065 | TaskState *ts = cpu->opaque; |
66fb9763 | 1066 | |
c8ee0a44 | 1067 | trace_user_handle_signal(cpu_env, sig); |
66fb9763 | 1068 | /* dequeue signal */ |
907f5fdd | 1069 | k->pending = 0; |
3b46e624 | 1070 | |
db6b81d4 | 1071 | sig = gdb_handlesig(cpu, sig); |
1fddef4b | 1072 | if (!sig) { |
ca587a8e AJ |
1073 | sa = NULL; |
1074 | handler = TARGET_SIG_IGN; | |
1075 | } else { | |
1076 | sa = &sigact_table[sig - 1]; | |
1077 | handler = sa->_sa_handler; | |
1fddef4b | 1078 | } |
66fb9763 | 1079 | |
4b25a506 | 1080 | if (unlikely(qemu_loglevel_mask(LOG_STRACE))) { |
0cb581d6 PM |
1081 | print_taken_signal(sig, &k->info); |
1082 | } | |
1083 | ||
66fb9763 | 1084 | if (handler == TARGET_SIG_DFL) { |
ca587a8e AJ |
1085 | /* default handler : ignore some signal. The other are job control or fatal */ |
1086 | if (sig == TARGET_SIGTSTP || sig == TARGET_SIGTTIN || sig == TARGET_SIGTTOU) { | |
1087 | kill(getpid(),SIGSTOP); | |
1088 | } else if (sig != TARGET_SIGCHLD && | |
1089 | sig != TARGET_SIGURG && | |
1090 | sig != TARGET_SIGWINCH && | |
1091 | sig != TARGET_SIGCONT) { | |
c599d4d6 | 1092 | dump_core_and_abort(sig); |
66fb9763 FB |
1093 | } |
1094 | } else if (handler == TARGET_SIG_IGN) { | |
1095 | /* ignore sig */ | |
1096 | } else if (handler == TARGET_SIG_ERR) { | |
c599d4d6 | 1097 | dump_core_and_abort(sig); |
66fb9763 | 1098 | } else { |
9de5e440 | 1099 | /* compute the blocked signals during the handler execution */ |
3d3efba0 PM |
1100 | sigset_t *blocked_set; |
1101 | ||
624f7979 | 1102 | target_to_host_sigset(&set, &sa->sa_mask); |
9de5e440 FB |
1103 | /* SA_NODEFER indicates that the current signal should not be |
1104 | blocked during the handler */ | |
624f7979 | 1105 | if (!(sa->sa_flags & TARGET_SA_NODEFER)) |
9de5e440 | 1106 | sigaddset(&set, target_to_host_signal(sig)); |
3b46e624 | 1107 | |
9de5e440 FB |
1108 | /* save the previous blocked signal state to restore it at the |
1109 | end of the signal execution (see do_sigreturn) */ | |
3d3efba0 PM |
1110 | host_to_target_sigset_internal(&target_old_set, &ts->signal_mask); |
1111 | ||
1112 | /* block signals in the handler */ | |
1113 | blocked_set = ts->in_sigsuspend ? | |
1114 | &ts->sigsuspend_mask : &ts->signal_mask; | |
1115 | sigorset(&ts->signal_mask, blocked_set, &set); | |
1116 | ts->in_sigsuspend = 0; | |
9de5e440 | 1117 | |
bc8a22cc | 1118 | /* if the CPU is in VM86 mode, we restore the 32 bit values */ |
84409ddb | 1119 | #if defined(TARGET_I386) && !defined(TARGET_X86_64) |
bc8a22cc FB |
1120 | { |
1121 | CPUX86State *env = cpu_env; | |
1122 | if (env->eflags & VM_MASK) | |
1123 | save_v86_state(env); | |
1124 | } | |
1125 | #endif | |
9de5e440 | 1126 | /* prepare the stack frame of the virtual CPU */ |
cb6ac802 LV |
1127 | #if defined(TARGET_ARCH_HAS_SETUP_FRAME) |
1128 | if (sa->sa_flags & TARGET_SA_SIGINFO) { | |
907f5fdd | 1129 | setup_rt_frame(sig, sa, &k->info, &target_old_set, cpu_env); |
cb6ac802 | 1130 | } else { |
624f7979 | 1131 | setup_frame(sig, sa, &target_old_set, cpu_env); |
cb6ac802 LV |
1132 | } |
1133 | #else | |
1134 | /* These targets do not have traditional signals. */ | |
1135 | setup_rt_frame(sig, sa, &k->info, &target_old_set, cpu_env); | |
ff970904 | 1136 | #endif |
7ec87e06 | 1137 | if (sa->sa_flags & TARGET_SA_RESETHAND) { |
624f7979 | 1138 | sa->_sa_handler = TARGET_SIG_DFL; |
7ec87e06 | 1139 | } |
31e31b8a | 1140 | } |
66fb9763 | 1141 | } |
e902d588 PM |
1142 | |
1143 | void process_pending_signals(CPUArchState *cpu_env) | |
1144 | { | |
29a0af61 | 1145 | CPUState *cpu = env_cpu(cpu_env); |
e902d588 PM |
1146 | int sig; |
1147 | TaskState *ts = cpu->opaque; | |
3d3efba0 PM |
1148 | sigset_t set; |
1149 | sigset_t *blocked_set; | |
e902d588 | 1150 | |
d73415a3 | 1151 | while (qatomic_read(&ts->signal_pending)) { |
3d3efba0 PM |
1152 | sigfillset(&set); |
1153 | sigprocmask(SIG_SETMASK, &set, 0); | |
1154 | ||
8bd3773c | 1155 | restart_scan: |
655ed67c TB |
1156 | sig = ts->sync_signal.pending; |
1157 | if (sig) { | |
1158 | /* Synchronous signals are forced, | |
1159 | * see force_sig_info() and callers in Linux | |
1160 | * Note that not all of our queue_signal() calls in QEMU correspond | |
1161 | * to force_sig_info() calls in Linux (some are send_sig_info()). | |
1162 | * However it seems like a kernel bug to me to allow the process | |
1163 | * to block a synchronous signal since it could then just end up | |
1164 | * looping round and round indefinitely. | |
1165 | */ | |
1166 | if (sigismember(&ts->signal_mask, target_to_host_signal_table[sig]) | |
1167 | || sigact_table[sig - 1]._sa_handler == TARGET_SIG_IGN) { | |
1168 | sigdelset(&ts->signal_mask, target_to_host_signal_table[sig]); | |
1169 | sigact_table[sig - 1]._sa_handler = TARGET_SIG_DFL; | |
1170 | } | |
1171 | ||
31efaef1 | 1172 | handle_pending_signal(cpu_env, sig, &ts->sync_signal); |
655ed67c TB |
1173 | } |
1174 | ||
3d3efba0 PM |
1175 | for (sig = 1; sig <= TARGET_NSIG; sig++) { |
1176 | blocked_set = ts->in_sigsuspend ? | |
1177 | &ts->sigsuspend_mask : &ts->signal_mask; | |
1178 | ||
1179 | if (ts->sigtab[sig - 1].pending && | |
1180 | (!sigismember(blocked_set, | |
655ed67c | 1181 | target_to_host_signal_table[sig]))) { |
31efaef1 | 1182 | handle_pending_signal(cpu_env, sig, &ts->sigtab[sig - 1]); |
8bd3773c PM |
1183 | /* Restart scan from the beginning, as handle_pending_signal |
1184 | * might have resulted in a new synchronous signal (eg SIGSEGV). | |
1185 | */ | |
1186 | goto restart_scan; | |
3d3efba0 | 1187 | } |
e902d588 | 1188 | } |
3d3efba0 PM |
1189 | |
1190 | /* if no signal is pending, unblock signals and recheck (the act | |
1191 | * of unblocking might cause us to take another host signal which | |
1192 | * will set signal_pending again). | |
1193 | */ | |
d73415a3 | 1194 | qatomic_set(&ts->signal_pending, 0); |
3d3efba0 PM |
1195 | ts->in_sigsuspend = 0; |
1196 | set = ts->signal_mask; | |
1197 | sigdelset(&set, SIGSEGV); | |
1198 | sigdelset(&set, SIGBUS); | |
1199 | sigprocmask(SIG_SETMASK, &set, 0); | |
1200 | } | |
1201 | ts->in_sigsuspend = 0; | |
e902d588 | 1202 | } |
0a99f093 RH |
1203 | |
1204 | int process_sigsuspend_mask(sigset_t **pset, target_ulong sigset, | |
1205 | target_ulong sigsize) | |
1206 | { | |
1207 | TaskState *ts = (TaskState *)thread_cpu->opaque; | |
1208 | sigset_t *host_set = &ts->sigsuspend_mask; | |
1209 | target_sigset_t *target_sigset; | |
1210 | ||
1211 | if (sigsize != sizeof(*target_sigset)) { | |
1212 | /* Like the kernel, we enforce correct size sigsets */ | |
1213 | return -TARGET_EINVAL; | |
1214 | } | |
1215 | ||
1216 | target_sigset = lock_user(VERIFY_READ, sigset, sigsize, 1); | |
1217 | if (!target_sigset) { | |
1218 | return -TARGET_EFAULT; | |
1219 | } | |
1220 | target_to_host_sigset(host_set, target_sigset); | |
1221 | unlock_user(target_sigset, sigset, 0); | |
1222 | ||
1223 | *pset = host_set; | |
1224 | return 0; | |
1225 | } |