LXR qemu/linux-user/host/aarch64/hostdep.h

   1/*
   2 * hostdep.h : things which are dependent on the host architecture
   3 *
   4 *  * Written by Peter Maydell <peter.maydell@linaro.org>
   5 *
   6 * Copyright (C) 2016 Linaro Limited
   7 *
   8 * This work is licensed under the terms of the GNU GPL, version 2 or later.
   9 * See the COPYING file in the top-level directory.
  10 */
  11
  12#ifndef AARCH64_HOSTDEP_H
  13#define AARCH64_HOSTDEP_H
  14
  15/* We have a safe-syscall.inc.S */
  16#define HAVE_SAFE_SYSCALL
  17
  18#ifndef __ASSEMBLER__
  19
  20/* These are defined by the safe-syscall.inc.S file */
  21extern char safe_syscall_start[];
  22extern char safe_syscall_end[];
  23
  24/* Adjust the signal context to rewind out of safe-syscall if we're in it */
  25static inline void rewind_if_in_safe_syscall(void *puc)
  26{
  27    ucontext_t *uc = puc;
  28    __u64 *pcreg = &uc->uc_mcontext.pc;
  29
  30    if (*pcreg > (uintptr_t)safe_syscall_start
  31        && *pcreg < (uintptr_t)safe_syscall_end) {
  32        *pcreg = (uintptr_t)safe_syscall_start;
  33    }
  34}
  35
  36#endif /* __ASSEMBLER__ */
  37
  38#endif
  39