76 lines
3.2 KiB
C
76 lines
3.2 KiB
C
/*
|
|
* Emulation of BSD signals
|
|
*
|
|
* Copyright (c) 2013 Stacey Son
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
|
|
#ifndef SIGNAL_COMMON_H
|
|
#define SIGNAL_COMMON_H
|
|
|
|
/**
|
|
* 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 -TARGET_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 */
|
|
|
|
long do_rt_sigreturn(CPUArchState *env);
|
|
int do_sigaction(int sig, const struct target_sigaction *act,
|
|
struct target_sigaction *oact);
|
|
abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
|
|
long do_sigreturn(CPUArchState *env, abi_ulong addr);
|
|
void force_sig_fault(int sig, int code, abi_ulong addr);
|
|
int host_to_target_signal(int sig);
|
|
void host_to_target_sigset(target_sigset_t *d, const sigset_t *s);
|
|
void process_pending_signals(CPUArchState *env);
|
|
void queue_signal(CPUArchState *env, int sig, int si_type,
|
|
target_siginfo_t *info);
|
|
void signal_init(void);
|
|
int target_to_host_signal(int sig);
|
|
void target_to_host_sigset(sigset_t *d, const target_sigset_t *s);
|
|
|
|
/*
|
|
* Within QEMU the top 8 bits of si_code indicate which of the parts of the
|
|
* union in target_siginfo is valid. This only applies between
|
|
* host_to_target_siginfo_noswap() and tswap_siginfo(); it does not appear
|
|
* either within host siginfo_t or in target_siginfo structures which we get
|
|
* from the guest userspace program. Linux kenrels use this internally, but BSD
|
|
* kernels don't do this, but its a useful abstraction.
|
|
*
|
|
* The linux-user version of this uses the top 16 bits, but FreeBSD's SI_USER
|
|
* and other signal indepenent SI_ codes have bit 16 set, so we only use the top
|
|
* byte instead.
|
|
*
|
|
* For FreeBSD, we have si_pid, si_uid, si_status, and si_addr always. Linux and
|
|
* {Open,Net}BSD have a different approach (where their reason field is larger,
|
|
* but whose siginfo has fewer fields always).
|
|
*
|
|
* QEMU_SI_CAPSICUM is currently only FreeBSD 14 current only, so only define
|
|
* it where _capsicum is available.
|
|
*/
|
|
#define QEMU_SI_NOINFO 0 /* nothing other than si_signo valid */
|
|
#define QEMU_SI_FAULT 1 /* _fault is valid in _reason */
|
|
#define QEMU_SI_TIMER 2 /* _timer is valid in _reason */
|
|
#define QEMU_SI_MESGQ 3 /* _mesgq is valid in _reason */
|
|
#define QEMU_SI_POLL 4 /* _poll is valid in _reason */
|
|
#if defined(__FreeBSD_version) && __FreeBSD_version >= 1400026
|
|
#define QEMU_SI_CAPSICUM 5 /* _capsicum is valid in _reason */
|
|
#endif
|
|
|
|
#endif
|