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 int on_sig_stack(unsigned long sp); 24 int sas_ss_flags(unsigned long sp); 25 abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka); 26 void target_save_altstack(target_stack_t *uss, CPUArchState *env); 27 abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env); 28 29 static inline void target_sigemptyset(target_sigset_t *set) 30 { 31 memset(set, 0, sizeof(*set)); 32 } 33 34 void host_to_target_sigset_internal(target_sigset_t *d, 35 const sigset_t *s); 36 void target_to_host_sigset_internal(sigset_t *d, 37 const target_sigset_t *s); 38 void tswap_siginfo(target_siginfo_t *tinfo, 39 const target_siginfo_t *info); 40 void set_sigmask(const sigset_t *set); 41 void force_sig(int sig); 42 void force_sigsegv(int oldsig); 43 #if defined(TARGET_ARCH_HAS_SETUP_FRAME) 44 void setup_frame(int sig, struct target_sigaction *ka, 45 target_sigset_t *set, CPUArchState *env); 46 #endif 47 void setup_rt_frame(int sig, struct target_sigaction *ka, 48 target_siginfo_t *info, 49 target_sigset_t *set, CPUArchState *env); 50 51 void process_pending_signals(CPUArchState *cpu_env); 52 void signal_init(void); 53 int queue_signal(CPUArchState *env, int sig, int si_type, 54 target_siginfo_t *info); 55 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); 56 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); 57 int target_to_host_signal(int sig); 58 int host_to_target_signal(int sig); 59 long do_sigreturn(CPUArchState *env); 60 long do_rt_sigreturn(CPUArchState *env); 61 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, 62 CPUArchState *env); 63 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); 64 abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, 65 abi_ulong unew_ctx, abi_long ctx_size); 66 /** 67 * block_signals: block all signals while handling this guest syscall 68 * 69 * Block all signals, and arrange that the signal mask is returned to 70 * its correct value for the guest before we resume execution of guest code. 71 * If this function returns non-zero, then the caller should immediately 72 * return -TARGET_ERESTARTSYS to the main loop, which will take the pending 73 * signal and restart execution of the syscall. 74 * If block_signals() returns zero, then the caller can continue with 75 * emulation of the system call knowing that no signals can be taken 76 * (and therefore that no race conditions will result). 77 * This should only be called once, because if it is called a second time 78 * it will always return non-zero. (Think of it like a mutex that can't 79 * be recursively locked.) 80 * Signals will be unblocked again by process_pending_signals(). 81 * 82 * Return value: non-zero if there was a pending signal, zero if not. 83 */ 84 int block_signals(void); /* Returns non zero if signal pending */ 85 86 #endif 87