signal-common.h (3922B)
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/* Fallback addresses into sigtramp page. */ 24extern abi_ulong default_sigreturn; 25extern abi_ulong default_rt_sigreturn; 26 27void setup_sigtramp(abi_ulong tramp_page); 28 29int on_sig_stack(unsigned long sp); 30int sas_ss_flags(unsigned long sp); 31abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka); 32void target_save_altstack(target_stack_t *uss, CPUArchState *env); 33abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env); 34 35static inline void target_sigemptyset(target_sigset_t *set) 36{ 37 memset(set, 0, sizeof(*set)); 38} 39 40void host_to_target_sigset_internal(target_sigset_t *d, 41 const sigset_t *s); 42void target_to_host_sigset_internal(sigset_t *d, 43 const target_sigset_t *s); 44void tswap_siginfo(target_siginfo_t *tinfo, 45 const target_siginfo_t *info); 46void set_sigmask(const sigset_t *set); 47void force_sig(int sig); 48void force_sigsegv(int oldsig); 49void force_sig_fault(int sig, int code, abi_ulong addr); 50#if defined(TARGET_ARCH_HAS_SETUP_FRAME) 51void setup_frame(int sig, struct target_sigaction *ka, 52 target_sigset_t *set, CPUArchState *env); 53#endif 54void setup_rt_frame(int sig, struct target_sigaction *ka, 55 target_siginfo_t *info, 56 target_sigset_t *set, CPUArchState *env); 57 58void process_pending_signals(CPUArchState *cpu_env); 59void signal_init(void); 60int queue_signal(CPUArchState *env, int sig, int si_type, 61 target_siginfo_t *info); 62void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); 63void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); 64int target_to_host_signal(int sig); 65int host_to_target_signal(int sig); 66long do_sigreturn(CPUArchState *env); 67long do_rt_sigreturn(CPUArchState *env); 68abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, 69 CPUArchState *env); 70int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); 71abi_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 -TARGET_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 */ 91int block_signals(void); /* Returns non zero if signal pending */ 92 93#endif