Merge tag 'linux-user-for-7.1-pull-request' of https://gitlab.com/laurent_vivier...
[qemu.git] / linux-user / signal-common.h
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 int 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 #endif