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84778508 BS |
1 | /* |
2 | * Emulation of BSD signals | |
3 | * | |
4 | * Copyright (c) 2003 - 2008 Fabrice Bellard | |
1366ef81 | 5 | * Copyright (c) 2013 Stacey Son |
84778508 BS |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
8167ee88 | 18 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
84778508 | 19 | */ |
84778508 | 20 | |
5abfac27 | 21 | #include "qemu/osdep.h" |
84778508 | 22 | #include "qemu.h" |
0ef59989 | 23 | #include "signal-common.h" |
6ddc1abe | 24 | #include "trace.h" |
fc9f9bdd | 25 | #include "hw/core/tcg-cpu-ops.h" |
85fc1b5d | 26 | #include "host-signal.h" |
84778508 | 27 | |
835b04ed WL |
28 | /* |
29 | * Stubbed out routines until we merge signal support from bsd-user | |
30 | * fork. | |
31 | */ | |
32 | ||
149076ad WL |
33 | static struct target_sigaction sigact_table[TARGET_NSIG]; |
34 | static void host_signal_handler(int host_sig, siginfo_t *info, void *puc); | |
35 | ||
1366ef81 WL |
36 | /* |
37 | * The BSD ABIs use the same singal numbers across all the CPU architectures, so | |
38 | * (unlike Linux) these functions are just the identity mapping. This might not | |
39 | * be true for XyzBSD running on AbcBSD, which doesn't currently work. | |
40 | */ | |
41 | int host_to_target_signal(int sig) | |
42 | { | |
43 | return sig; | |
44 | } | |
45 | ||
46 | int target_to_host_signal(int sig) | |
47 | { | |
48 | return sig; | |
49 | } | |
50 | ||
c34f2aaf WL |
51 | static bool has_trapno(int tsig) |
52 | { | |
53 | return tsig == TARGET_SIGILL || | |
54 | tsig == TARGET_SIGFPE || | |
55 | tsig == TARGET_SIGSEGV || | |
56 | tsig == TARGET_SIGBUS || | |
57 | tsig == TARGET_SIGTRAP; | |
58 | } | |
59 | ||
60 | ||
61 | /* Siginfo conversion. */ | |
62 | ||
63 | /* | |
64 | * Populate tinfo w/o swapping based on guessing which fields are valid. | |
65 | */ | |
66 | static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, | |
67 | const siginfo_t *info) | |
68 | { | |
69 | int sig = host_to_target_signal(info->si_signo); | |
70 | int si_code = info->si_code; | |
71 | int si_type; | |
72 | ||
73 | /* | |
74 | * Make sure we that the variable portion of the target siginfo is zeroed | |
75 | * out so we don't leak anything into that. | |
76 | */ | |
77 | memset(&tinfo->_reason, 0, sizeof(tinfo->_reason)); | |
78 | ||
79 | /* | |
80 | * This is awkward, because we have to use a combination of the si_code and | |
81 | * si_signo to figure out which of the union's members are valid.o We | |
82 | * therefore make our best guess. | |
83 | * | |
84 | * Once we have made our guess, we record it in the top 16 bits of | |
85 | * the si_code, so that tswap_siginfo() later can use it. | |
86 | * tswap_siginfo() will strip these top bits out before writing | |
87 | * si_code to the guest (sign-extending the lower bits). | |
88 | */ | |
89 | tinfo->si_signo = sig; | |
90 | tinfo->si_errno = info->si_errno; | |
91 | tinfo->si_code = info->si_code; | |
92 | tinfo->si_pid = info->si_pid; | |
93 | tinfo->si_uid = info->si_uid; | |
94 | tinfo->si_status = info->si_status; | |
95 | tinfo->si_addr = (abi_ulong)(unsigned long)info->si_addr; | |
96 | /* | |
97 | * si_value is opaque to kernel. On all FreeBSD platforms, | |
98 | * sizeof(sival_ptr) >= sizeof(sival_int) so the following | |
99 | * always will copy the larger element. | |
100 | */ | |
101 | tinfo->si_value.sival_ptr = | |
102 | (abi_ulong)(unsigned long)info->si_value.sival_ptr; | |
103 | ||
104 | switch (si_code) { | |
105 | /* | |
106 | * All the SI_xxx codes that are defined here are global to | |
107 | * all the signals (they have values that none of the other, | |
108 | * more specific signal info will set). | |
109 | */ | |
110 | case SI_USER: | |
111 | case SI_LWP: | |
112 | case SI_KERNEL: | |
113 | case SI_QUEUE: | |
114 | case SI_ASYNCIO: | |
115 | /* | |
116 | * Only the fixed parts are valid (though FreeBSD doesn't always | |
117 | * set all the fields to non-zero values. | |
118 | */ | |
119 | si_type = QEMU_SI_NOINFO; | |
120 | break; | |
121 | case SI_TIMER: | |
122 | tinfo->_reason._timer._timerid = info->_reason._timer._timerid; | |
123 | tinfo->_reason._timer._overrun = info->_reason._timer._overrun; | |
124 | si_type = QEMU_SI_TIMER; | |
125 | break; | |
126 | case SI_MESGQ: | |
127 | tinfo->_reason._mesgq._mqd = info->_reason._mesgq._mqd; | |
128 | si_type = QEMU_SI_MESGQ; | |
129 | break; | |
130 | default: | |
131 | /* | |
132 | * We have to go based on the signal number now to figure out | |
133 | * what's valid. | |
134 | */ | |
135 | if (has_trapno(sig)) { | |
136 | tinfo->_reason._fault._trapno = info->_reason._fault._trapno; | |
137 | si_type = QEMU_SI_FAULT; | |
138 | } | |
139 | #ifdef TARGET_SIGPOLL | |
140 | /* | |
141 | * FreeBSD never had SIGPOLL, but emulates it for Linux so there's | |
142 | * a chance it may popup in the future. | |
143 | */ | |
144 | if (sig == TARGET_SIGPOLL) { | |
145 | tinfo->_reason._poll._band = info->_reason._poll._band; | |
146 | si_type = QEMU_SI_POLL; | |
147 | } | |
148 | #endif | |
149 | /* | |
150 | * Unsure that this can actually be generated, and our support for | |
151 | * capsicum is somewhere between weak and non-existant, but if we get | |
152 | * one, then we know what to save. | |
153 | */ | |
154 | if (sig == TARGET_SIGTRAP) { | |
155 | tinfo->_reason._capsicum._syscall = | |
156 | info->_reason._capsicum._syscall; | |
157 | si_type = QEMU_SI_CAPSICUM; | |
158 | } | |
159 | break; | |
160 | } | |
161 | tinfo->si_code = deposit32(si_code, 24, 8, si_type); | |
162 | } | |
163 | ||
5abfac27 WL |
164 | /* |
165 | * Queue a signal so that it will be send to the virtual CPU as soon as | |
166 | * possible. | |
167 | */ | |
e32a6301 WL |
168 | void queue_signal(CPUArchState *env, int sig, int si_type, |
169 | target_siginfo_t *info) | |
5abfac27 WL |
170 | { |
171 | qemu_log_mask(LOG_UNIMP, "No signal queueing, dropping signal %d\n", sig); | |
172 | } | |
173 | ||
149076ad WL |
174 | static int fatal_signal(int sig) |
175 | { | |
176 | ||
177 | switch (sig) { | |
178 | case TARGET_SIGCHLD: | |
179 | case TARGET_SIGURG: | |
180 | case TARGET_SIGWINCH: | |
181 | case TARGET_SIGINFO: | |
182 | /* Ignored by default. */ | |
183 | return 0; | |
184 | case TARGET_SIGCONT: | |
185 | case TARGET_SIGSTOP: | |
186 | case TARGET_SIGTSTP: | |
187 | case TARGET_SIGTTIN: | |
188 | case TARGET_SIGTTOU: | |
189 | /* Job control signals. */ | |
190 | return 0; | |
191 | default: | |
192 | return 1; | |
193 | } | |
194 | } | |
195 | ||
0ef59989 WL |
196 | /* |
197 | * Force a synchronously taken QEMU_SI_FAULT signal. For QEMU the | |
198 | * 'force' part is handled in process_pending_signals(). | |
199 | */ | |
200 | void force_sig_fault(int sig, int code, abi_ulong addr) | |
201 | { | |
202 | CPUState *cpu = thread_cpu; | |
203 | CPUArchState *env = cpu->env_ptr; | |
204 | target_siginfo_t info = {}; | |
205 | ||
206 | info.si_signo = sig; | |
207 | info.si_errno = 0; | |
208 | info.si_code = code; | |
209 | info.si_addr = addr; | |
e32a6301 | 210 | queue_signal(env, sig, QEMU_SI_FAULT, &info); |
0ef59989 WL |
211 | } |
212 | ||
149076ad WL |
213 | static void host_signal_handler(int host_sig, siginfo_t *info, void *puc) |
214 | { | |
215 | } | |
216 | ||
84778508 BS |
217 | void signal_init(void) |
218 | { | |
149076ad WL |
219 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
220 | struct sigaction act; | |
221 | struct sigaction oact; | |
222 | int i; | |
223 | int host_sig; | |
224 | ||
225 | /* Set the signal mask from the host mask. */ | |
226 | sigprocmask(0, 0, &ts->signal_mask); | |
227 | ||
228 | sigfillset(&act.sa_mask); | |
229 | act.sa_sigaction = host_signal_handler; | |
230 | act.sa_flags = SA_SIGINFO; | |
231 | ||
232 | for (i = 1; i <= TARGET_NSIG; i++) { | |
233 | #ifdef CONFIG_GPROF | |
234 | if (i == TARGET_SIGPROF) { | |
235 | continue; | |
236 | } | |
237 | #endif | |
238 | host_sig = target_to_host_signal(i); | |
239 | sigaction(host_sig, NULL, &oact); | |
240 | if (oact.sa_sigaction == (void *)SIG_IGN) { | |
241 | sigact_table[i - 1]._sa_handler = TARGET_SIG_IGN; | |
242 | } else if (oact.sa_sigaction == (void *)SIG_DFL) { | |
243 | sigact_table[i - 1]._sa_handler = TARGET_SIG_DFL; | |
244 | } | |
245 | /* | |
246 | * If there's already a handler installed then something has | |
247 | * gone horribly wrong, so don't even try to handle that case. | |
248 | * Install some handlers for our own use. We need at least | |
249 | * SIGSEGV and SIGBUS, to detect exceptions. We can not just | |
250 | * trap all signals because it affects syscall interrupt | |
251 | * behavior. But do trap all default-fatal signals. | |
252 | */ | |
253 | if (fatal_signal(i)) { | |
254 | sigaction(host_sig, &act, NULL); | |
255 | } | |
256 | } | |
84778508 BS |
257 | } |
258 | ||
9349b4f9 | 259 | void process_pending_signals(CPUArchState *cpu_env) |
84778508 BS |
260 | { |
261 | } | |
835b04ed WL |
262 | |
263 | void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr, | |
264 | MMUAccessType access_type, bool maperr, uintptr_t ra) | |
265 | { | |
fc9f9bdd WL |
266 | const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops; |
267 | ||
268 | if (tcg_ops->record_sigsegv) { | |
269 | tcg_ops->record_sigsegv(cpu, addr, access_type, maperr, ra); | |
270 | } | |
271 | ||
272 | force_sig_fault(TARGET_SIGSEGV, | |
273 | maperr ? TARGET_SEGV_MAPERR : TARGET_SEGV_ACCERR, | |
274 | addr); | |
275 | cpu->exception_index = EXCP_INTERRUPT; | |
276 | cpu_loop_exit_restore(cpu, ra); | |
835b04ed WL |
277 | } |
278 | ||
279 | void cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr, | |
280 | MMUAccessType access_type, uintptr_t ra) | |
281 | { | |
cfdee273 WL |
282 | const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops; |
283 | ||
284 | if (tcg_ops->record_sigbus) { | |
285 | tcg_ops->record_sigbus(cpu, addr, access_type, ra); | |
286 | } | |
287 | ||
288 | force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, addr); | |
289 | cpu->exception_index = EXCP_INTERRUPT; | |
290 | cpu_loop_exit_restore(cpu, ra); | |
835b04ed | 291 | } |