linux-user/host/riscv64/hostdep.h

   1 /*
   2  * hostdep.h : things which are dependent on the host architecture
   3  *
   4  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   5  * See the COPYING file in the top-level directory.
   6  */
   7
   8 #ifndef RISCV64_HOSTDEP_H
   9 #define RISCV64_HOSTDEP_H
  10
  11 /* We have a safe-syscall.inc.S */
  12 #define HAVE_SAFE_SYSCALL
  13
  14 #ifndef __ASSEMBLER__
  15
  16 /* These are defined by the safe-syscall.inc.S file */
  17 extern char safe_syscall_start[];
  18 extern char safe_syscall_end[];
  19
  20 /* Adjust the signal context to rewind out of safe-syscall if we're in it */
  21 static inline void rewind_if_in_safe_syscall(void *puc)
  22 {
  23     ucontext_t *uc = puc;
  24     unsigned long *pcreg = &uc->uc_mcontext.__gregs[REG_PC];
  25
  26     if (*pcreg > (uintptr_t)safe_syscall_start
  27         && *pcreg < (uintptr_t)safe_syscall_end) {
  28         *pcreg = (uintptr_t)safe_syscall_start;
  29     }
  30 }
  31
  32 #endif /* __ASSEMBLER__ */
  33
  34 #endif