arch/um/include/sysdep-i386/sigcontext.h

   1 /*
   2  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __SYS_SIGCONTEXT_I386_H
   7 #define __SYS_SIGCONTEXT_I386_H
   8
   9 #include "uml-config.h"
  10 #include "skas.h"
  11 #include "sysdep/sc.h"
  12
  13 #define IP_RESTART_SYSCALL(ip) ((ip) -= 2)
  14
  15 #define SC_RESTART_SYSCALL(sc) IP_RESTART_SYSCALL(SC_IP(sc))
  16 #define SC_SET_SYSCALL_RETURN(sc, result) SC_EAX(sc) = (result)
  17
  18 #define GET_FAULTINFO_FROM_SC(fi,sc) \
  19         { \
  20                 (fi).cr2 = SC_CR2(sc); \
  21                 (fi).error_code = SC_ERR(sc); \
  22                 (fi).trap_no = SC_TRAPNO(sc); \
  23         }
  24
  25 /* ptrace expects that, at the start of a system call, %eax contains
  26  * -ENOSYS, so this makes it so.
  27  */
  28 #define SC_START_SYSCALL(sc) do SC_EAX(sc) = -ENOSYS; while(0)
  29
  30 /* This is Page Fault */
  31 #define SEGV_IS_FIXABLE(fi)     ((fi)->trap_no == 14)
  32
  33 /* SKAS3 has no trap_no on i386, but get_skas_faultinfo() sets it to 0. */
  34 #define SEGV_MAYBE_FIXABLE(fi)  ((fi)->trap_no == 0 && ptrace_faultinfo)
  35
  36 extern unsigned long *sc_sigmask(void *sc_ptr);
  37 extern int sc_get_fpregs(unsigned long buf, void *sc_ptr);
  38
  39 #endif