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