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