1 /* 2 * Emulation of Linux signals 3 * 4 * Copyright (c) 2003 Fabrice Bellard 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #ifndef SIGNAL_COMMON_H 21 #define SIGNAL_COMMON_H 22 23 #include "special-errno.h" 24 25 /* Fallback addresses into sigtramp page. */ 26 extern abi_ulong default_sigreturn; 27 extern abi_ulong default_rt_sigreturn; 28 29 void setup_sigtramp(abi_ulong tramp_page); 30 31 int on_sig_stack(unsigned long sp); 32 int sas_ss_flags(unsigned long sp); 33 abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka); 34 void target_save_altstack(target_stack_t *uss, CPUArchState *env); 35 abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env); 36 37 static inline void target_sigemptyset(target_sigset_t *set) 38 { 39 memset(set, 0, sizeof(*set)); 40 } 41 42 void host_to_target_sigset_internal(target_sigset_t *d, 43 const sigset_t *s); 44 void target_to_host_sigset_internal(sigset_t *d, 45 const target_sigset_t *s); 46 void set_sigmask(const sigset_t *set); 47 void force_sig(int sig); 48 void force_sigsegv(int oldsig); 49 void force_sig_fault(int sig, int code, abi_ulong addr); 50 #if defined(TARGET_ARCH_HAS_SETUP_FRAME) 51 void setup_frame(int sig, struct target_sigaction *ka, 52 target_sigset_t *set, CPUArchState *env); 53 #endif 54 void setup_rt_frame(int sig, struct target_sigaction *ka, 55 target_siginfo_t *info, 56 target_sigset_t *set, CPUArchState *env); 57 58 void process_pending_signals(CPUArchState *cpu_env); 59 void signal_init(void); 60 void queue_signal(CPUArchState *env, int sig, int si_type, 61 target_siginfo_t *info); 62 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); 63 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); 64 int target_to_host_signal(int sig); 65 int host_to_target_signal(int sig); 66 long do_sigreturn(CPUArchState *env); 67 long do_rt_sigreturn(CPUArchState *env); 68 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, 69 CPUArchState *env); 70 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); 71 abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, 72 abi_ulong unew_ctx, abi_long ctx_size); 73 /** 74 * block_signals: block all signals while handling this guest syscall 75 * 76 * Block all signals, and arrange that the signal mask is returned to 77 * its correct value for the guest before we resume execution of guest code. 78 * If this function returns non-zero, then the caller should immediately 79 * return -QEMU_ERESTARTSYS to the main loop, which will take the pending 80 * signal and restart execution of the syscall. 81 * If block_signals() returns zero, then the caller can continue with 82 * emulation of the system call knowing that no signals can be taken 83 * (and therefore that no race conditions will result). 84 * This should only be called once, because if it is called a second time 85 * it will always return non-zero. (Think of it like a mutex that can't 86 * be recursively locked.) 87 * Signals will be unblocked again by process_pending_signals(). 88 * 89 * Return value: non-zero if there was a pending signal, zero if not. 90 */ 91 int block_signals(void); /* Returns non zero if signal pending */ 92 93 /** 94 * process_sigsuspend_mask: read and apply syscall-local signal mask 95 * 96 * Read the guest signal mask from @sigset, length @sigsize. 97 * Convert that to a host signal mask and save it to sigpending_mask. 98 * 99 * Return value: negative target errno, or zero; 100 * store &sigpending_mask into *pset on success. 101 */ 102 int process_sigsuspend_mask(sigset_t **pset, target_ulong sigset, 103 target_ulong sigsize); 104 105 /** 106 * finish_sigsuspend_mask: finish a sigsuspend-like syscall 107 * 108 * Set in_sigsuspend if we need to use the modified sigset 109 * during process_pending_signals. 110 */ 111 static inline void finish_sigsuspend_mask(int ret) 112 { 113 if (ret != -QEMU_ERESTARTSYS) { 114 TaskState *ts = get_task_state(thread_cpu); 115 ts->in_sigsuspend = 1; 116 } 117 } 118 119 #if defined(SIGSTKFLT) && defined(TARGET_SIGSTKFLT) 120 #define MAKE_SIG_ENTRY_SIGSTKFLT MAKE_SIG_ENTRY(SIGSTKFLT) 121 #else 122 #define MAKE_SIG_ENTRY_SIGSTKFLT 123 #endif 124 125 #if defined(SIGIOT) && defined(TARGET_SIGIOT) 126 #define MAKE_SIG_ENTRY_SIGIOT MAKE_SIG_ENTRY(SIGIOT) 127 #else 128 #define MAKE_SIG_ENTRY_SIGIOT 129 #endif 130 131 #define MAKE_SIGNAL_LIST \ 132 MAKE_SIG_ENTRY(SIGHUP) \ 133 MAKE_SIG_ENTRY(SIGINT) \ 134 MAKE_SIG_ENTRY(SIGQUIT) \ 135 MAKE_SIG_ENTRY(SIGILL) \ 136 MAKE_SIG_ENTRY(SIGTRAP) \ 137 MAKE_SIG_ENTRY(SIGABRT) \ 138 MAKE_SIG_ENTRY(SIGBUS) \ 139 MAKE_SIG_ENTRY(SIGFPE) \ 140 MAKE_SIG_ENTRY(SIGKILL) \ 141 MAKE_SIG_ENTRY(SIGUSR1) \ 142 MAKE_SIG_ENTRY(SIGSEGV) \ 143 MAKE_SIG_ENTRY(SIGUSR2) \ 144 MAKE_SIG_ENTRY(SIGPIPE) \ 145 MAKE_SIG_ENTRY(SIGALRM) \ 146 MAKE_SIG_ENTRY(SIGTERM) \ 147 MAKE_SIG_ENTRY(SIGCHLD) \ 148 MAKE_SIG_ENTRY(SIGCONT) \ 149 MAKE_SIG_ENTRY(SIGSTOP) \ 150 MAKE_SIG_ENTRY(SIGTSTP) \ 151 MAKE_SIG_ENTRY(SIGTTIN) \ 152 MAKE_SIG_ENTRY(SIGTTOU) \ 153 MAKE_SIG_ENTRY(SIGURG) \ 154 MAKE_SIG_ENTRY(SIGXCPU) \ 155 MAKE_SIG_ENTRY(SIGXFSZ) \ 156 MAKE_SIG_ENTRY(SIGVTALRM) \ 157 MAKE_SIG_ENTRY(SIGPROF) \ 158 MAKE_SIG_ENTRY(SIGWINCH) \ 159 MAKE_SIG_ENTRY(SIGIO) \ 160 MAKE_SIG_ENTRY(SIGPWR) \ 161 MAKE_SIG_ENTRY(SIGSYS) \ 162 MAKE_SIG_ENTRY_SIGSTKFLT \ 163 MAKE_SIG_ENTRY_SIGIOT 164 165 #endif 166