/* * Emulation of Linux signals * * Copyright (c) 2003 Fabrice Bellard * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #ifndef SIGNAL_COMMON_H #define SIGNAL_COMMON_H #include "special-errno.h" /* Fallback addresses into sigtramp page. */ extern abi_ulong default_sigreturn; extern abi_ulong default_rt_sigreturn; void setup_sigtramp(abi_ulong tramp_page); int on_sig_stack(unsigned long sp); int sas_ss_flags(unsigned long sp); abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka); void target_save_altstack(target_stack_t *uss, CPUArchState *env); abi_long target_restore_altstack(target_stack_t *uss, CPUArchState *env); static inline void target_sigemptyset(target_sigset_t *set) { memset(set, 0, sizeof(*set)); } void host_to_target_sigset_internal(target_sigset_t *d, const sigset_t *s); void target_to_host_sigset_internal(sigset_t *d, const target_sigset_t *s); void tswap_siginfo(target_siginfo_t *tinfo, const target_siginfo_t *info); void set_sigmask(const sigset_t *set); void force_sig(int sig); void force_sigsegv(int oldsig); void force_sig_fault(int sig, int code, abi_ulong addr); #if defined(TARGET_ARCH_HAS_SETUP_FRAME) void setup_frame(int sig, struct target_sigaction *ka, target_sigset_t *set, CPUArchState *env); #endif void setup_rt_frame(int sig, struct target_sigaction *ka, target_siginfo_t *info, target_sigset_t *set, CPUArchState *env); void process_pending_signals(CPUArchState *cpu_env); void signal_init(void); void queue_signal(CPUArchState *env, int sig, int si_type, target_siginfo_t *info); void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info); void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo); int target_to_host_signal(int sig); int host_to_target_signal(int sig); long do_sigreturn(CPUArchState *env); long do_rt_sigreturn(CPUArchState *env); abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, CPUArchState *env); int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset); abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, abi_ulong unew_ctx, abi_long ctx_size); /** * block_signals: block all signals while handling this guest syscall * * Block all signals, and arrange that the signal mask is returned to * its correct value for the guest before we resume execution of guest code. * If this function returns non-zero, then the caller should immediately * return -QEMU_ERESTARTSYS to the main loop, which will take the pending * signal and restart execution of the syscall. * If block_signals() returns zero, then the caller can continue with * emulation of the system call knowing that no signals can be taken * (and therefore that no race conditions will result). * This should only be called once, because if it is called a second time * it will always return non-zero. (Think of it like a mutex that can't * be recursively locked.) * Signals will be unblocked again by process_pending_signals(). * * Return value: non-zero if there was a pending signal, zero if not. */ int block_signals(void); /* Returns non zero if signal pending */ /** * process_sigsuspend_mask: read and apply syscall-local signal mask * * Read the guest signal mask from @sigset, length @sigsize. * Convert that to a host signal mask and save it to sigpending_mask. * * Return value: negative target errno, or zero; * store &sigpending_mask into *pset on success. */ int process_sigsuspend_mask(sigset_t **pset, target_ulong sigset, target_ulong sigsize); /** * finish_sigsuspend_mask: finish a sigsuspend-like syscall * * Set in_sigsuspend if we need to use the modified sigset * during process_pending_signals. */ static inline void finish_sigsuspend_mask(int ret) { if (ret != -QEMU_ERESTARTSYS) { TaskState *ts = (TaskState *)thread_cpu->opaque; ts->in_sigsuspend = 1; } } #endif