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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" |
fc9f9bdd | 24 | #include "hw/core/tcg-cpu-ops.h" |
84778508 | 25 | |
835b04ed WL |
26 | /* |
27 | * Stubbed out routines until we merge signal support from bsd-user | |
28 | * fork. | |
29 | */ | |
30 | ||
149076ad WL |
31 | static struct target_sigaction sigact_table[TARGET_NSIG]; |
32 | static void host_signal_handler(int host_sig, siginfo_t *info, void *puc); | |
33 | ||
1366ef81 WL |
34 | /* |
35 | * The BSD ABIs use the same singal numbers across all the CPU architectures, so | |
36 | * (unlike Linux) these functions are just the identity mapping. This might not | |
37 | * be true for XyzBSD running on AbcBSD, which doesn't currently work. | |
38 | */ | |
39 | int host_to_target_signal(int sig) | |
40 | { | |
41 | return sig; | |
42 | } | |
43 | ||
44 | int target_to_host_signal(int sig) | |
45 | { | |
46 | return sig; | |
47 | } | |
48 | ||
5abfac27 WL |
49 | /* |
50 | * Queue a signal so that it will be send to the virtual CPU as soon as | |
51 | * possible. | |
52 | */ | |
53 | void queue_signal(CPUArchState *env, int sig, target_siginfo_t *info) | |
54 | { | |
55 | qemu_log_mask(LOG_UNIMP, "No signal queueing, dropping signal %d\n", sig); | |
56 | } | |
57 | ||
149076ad WL |
58 | static int fatal_signal(int sig) |
59 | { | |
60 | ||
61 | switch (sig) { | |
62 | case TARGET_SIGCHLD: | |
63 | case TARGET_SIGURG: | |
64 | case TARGET_SIGWINCH: | |
65 | case TARGET_SIGINFO: | |
66 | /* Ignored by default. */ | |
67 | return 0; | |
68 | case TARGET_SIGCONT: | |
69 | case TARGET_SIGSTOP: | |
70 | case TARGET_SIGTSTP: | |
71 | case TARGET_SIGTTIN: | |
72 | case TARGET_SIGTTOU: | |
73 | /* Job control signals. */ | |
74 | return 0; | |
75 | default: | |
76 | return 1; | |
77 | } | |
78 | } | |
79 | ||
0ef59989 WL |
80 | /* |
81 | * Force a synchronously taken QEMU_SI_FAULT signal. For QEMU the | |
82 | * 'force' part is handled in process_pending_signals(). | |
83 | */ | |
84 | void force_sig_fault(int sig, int code, abi_ulong addr) | |
85 | { | |
86 | CPUState *cpu = thread_cpu; | |
87 | CPUArchState *env = cpu->env_ptr; | |
88 | target_siginfo_t info = {}; | |
89 | ||
90 | info.si_signo = sig; | |
91 | info.si_errno = 0; | |
92 | info.si_code = code; | |
93 | info.si_addr = addr; | |
94 | queue_signal(env, sig, &info); | |
95 | } | |
96 | ||
149076ad WL |
97 | static void host_signal_handler(int host_sig, siginfo_t *info, void *puc) |
98 | { | |
99 | } | |
100 | ||
84778508 BS |
101 | void signal_init(void) |
102 | { | |
149076ad WL |
103 | TaskState *ts = (TaskState *)thread_cpu->opaque; |
104 | struct sigaction act; | |
105 | struct sigaction oact; | |
106 | int i; | |
107 | int host_sig; | |
108 | ||
109 | /* Set the signal mask from the host mask. */ | |
110 | sigprocmask(0, 0, &ts->signal_mask); | |
111 | ||
112 | sigfillset(&act.sa_mask); | |
113 | act.sa_sigaction = host_signal_handler; | |
114 | act.sa_flags = SA_SIGINFO; | |
115 | ||
116 | for (i = 1; i <= TARGET_NSIG; i++) { | |
117 | #ifdef CONFIG_GPROF | |
118 | if (i == TARGET_SIGPROF) { | |
119 | continue; | |
120 | } | |
121 | #endif | |
122 | host_sig = target_to_host_signal(i); | |
123 | sigaction(host_sig, NULL, &oact); | |
124 | if (oact.sa_sigaction == (void *)SIG_IGN) { | |
125 | sigact_table[i - 1]._sa_handler = TARGET_SIG_IGN; | |
126 | } else if (oact.sa_sigaction == (void *)SIG_DFL) { | |
127 | sigact_table[i - 1]._sa_handler = TARGET_SIG_DFL; | |
128 | } | |
129 | /* | |
130 | * If there's already a handler installed then something has | |
131 | * gone horribly wrong, so don't even try to handle that case. | |
132 | * Install some handlers for our own use. We need at least | |
133 | * SIGSEGV and SIGBUS, to detect exceptions. We can not just | |
134 | * trap all signals because it affects syscall interrupt | |
135 | * behavior. But do trap all default-fatal signals. | |
136 | */ | |
137 | if (fatal_signal(i)) { | |
138 | sigaction(host_sig, &act, NULL); | |
139 | } | |
140 | } | |
84778508 BS |
141 | } |
142 | ||
9349b4f9 | 143 | void process_pending_signals(CPUArchState *cpu_env) |
84778508 BS |
144 | { |
145 | } | |
835b04ed WL |
146 | |
147 | void cpu_loop_exit_sigsegv(CPUState *cpu, target_ulong addr, | |
148 | MMUAccessType access_type, bool maperr, uintptr_t ra) | |
149 | { | |
fc9f9bdd WL |
150 | const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops; |
151 | ||
152 | if (tcg_ops->record_sigsegv) { | |
153 | tcg_ops->record_sigsegv(cpu, addr, access_type, maperr, ra); | |
154 | } | |
155 | ||
156 | force_sig_fault(TARGET_SIGSEGV, | |
157 | maperr ? TARGET_SEGV_MAPERR : TARGET_SEGV_ACCERR, | |
158 | addr); | |
159 | cpu->exception_index = EXCP_INTERRUPT; | |
160 | cpu_loop_exit_restore(cpu, ra); | |
835b04ed WL |
161 | } |
162 | ||
163 | void cpu_loop_exit_sigbus(CPUState *cpu, target_ulong addr, | |
164 | MMUAccessType access_type, uintptr_t ra) | |
165 | { | |
cfdee273 WL |
166 | const struct TCGCPUOps *tcg_ops = CPU_GET_CLASS(cpu)->tcg_ops; |
167 | ||
168 | if (tcg_ops->record_sigbus) { | |
169 | tcg_ops->record_sigbus(cpu, addr, access_type, ra); | |
170 | } | |
171 | ||
172 | force_sig_fault(TARGET_SIGBUS, TARGET_BUS_ADRALN, addr); | |
173 | cpu->exception_index = EXCP_INTERRUPT; | |
174 | cpu_loop_exit_restore(cpu, ra); | |
835b04ed | 175 | } |