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 tswap_siginfo(target_siginfo_t *tinfo, 47 const target_siginfo_t *info); 48 void set_sigmask(const sigset_t *set); 49 void force_sig(int sig); 50 void force_sigsegv(int oldsig); 51 void force_sig_fault(int sig, int code, abi_ulong addr); 52 #if defined(TARGET_ARCH_HAS_SETUP_FRAME) 53 void setup_frame(int sig, struct target_sigaction *ka, 54 target_sigset_t *set, CPUArchState *env); 55 #endif 56 void setup_rt_frame(int sig, struct target_sigaction *ka, 57 target_siginfo_t *info, 58 target_sigset_t *set, CPUArchState *env); 59 60 void process_pending_signals(CPUArchState *cpu_env); 61 void signal_init(void); 62 void queue_signal(CPUArchState *env, int sig, int si_type, 63 target_siginfo_t *info); 64 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); 65 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); 66 int target_to_host_signal(int sig); 67 int host_to_target_signal(int sig); 68 long do_sigreturn(CPUArchState *env); 69 long do_rt_sigreturn(CPUArchState *env); 70 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, 71 CPUArchState *env); 72 int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); 73 abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, 74 abi_ulong unew_ctx, abi_long ctx_size); 75 /** 76 * block_signals: block all signals while handling this guest syscall 77 * 78 * Block all signals, and arrange that the signal mask is returned to 79 * its correct value for the guest before we resume execution of guest code. 80 * If this function returns non-zero, then the caller should immediately 81 * return -QEMU_ERESTARTSYS to the main loop, which will take the pending 82 * signal and restart execution of the syscall. 83 * If block_signals() returns zero, then the caller can continue with 84 * emulation of the system call knowing that no signals can be taken 85 * (and therefore that no race conditions will result). 86 * This should only be called once, because if it is called a second time 87 * it will always return non-zero. (Think of it like a mutex that can't 88 * be recursively locked.) 89 * Signals will be unblocked again by process_pending_signals(). 90 * 91 * Return value: non-zero if there was a pending signal, zero if not. 92 */ 93 int block_signals(void); /* Returns non zero if signal pending */ 94 95 /** 96 * process_sigsuspend_mask: read and apply syscall-local signal mask 97 * 98 * Read the guest signal mask from @sigset, length @sigsize. 99 * Convert that to a host signal mask and save it to sigpending_mask. 100 * 101 * Return value: negative target errno, or zero; 102 * store &sigpending_mask into *pset on success. 103 */ 104 int process_sigsuspend_mask(sigset_t **pset, target_ulong sigset, 105 target_ulong sigsize); 106 107 /** 108 * finish_sigsuspend_mask: finish a sigsuspend-like syscall 109 * 110 * Set in_sigsuspend if we need to use the modified sigset 111 * during process_pending_signals. 112 */ 113 static inline void finish_sigsuspend_mask(int ret) 114 { 115 if (ret != -QEMU_ERESTARTSYS) { 116 TaskState *ts = (TaskState *)thread_cpu->opaque; 117 ts->in_sigsuspend = 1; 118 } 119 } 120 121 #endif 122