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

   1 /*
   2  * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.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 <sysdep/sc.h>
  11
  12 #define IP_RESTART_SYSCALL(ip) ((ip) -= 2)
  13
  14 #define SC_RESTART_SYSCALL(sc) IP_RESTART_SYSCALL(SC_IP(sc))
  15 #define SC_SET_SYSCALL_RETURN(sc, result) SC_EAX(sc) = (result)
  16
  17 #define GET_FAULTINFO_FROM_SC(fi,sc) \
  18         { \
  19                 (fi).cr2 = SC_CR2(sc); \
  20                 (fi).error_code = SC_ERR(sc); \
  21                 (fi).trap_no = SC_TRAPNO(sc); \
  22         }
  23
  24 /* ptrace expects that, at the start of a system call, %eax contains
  25  * -ENOSYS, so this makes it so.
  26  */
  27 #define SC_START_SYSCALL(sc) do SC_EAX(sc) = -ENOSYS; while(0)
  28
  29 /* This is Page Fault */
  30 #define SEGV_IS_FIXABLE(fi)     ((fi)->trap_no == 14)
  31
  32 /* SKAS3 has no trap_no on i386, but get_skas_faultinfo() sets it to 0. */
  33 #ifdef UML_CONFIG_MODE_SKAS
  34 #define SEGV_MAYBE_FIXABLE(fi)  ((fi)->trap_no == 0 && ptrace_faultinfo)
  35 #else
  36 #define SEGV_MAYBE_FIXABLE(fi)  0
  37 #endif
  38
  39 extern unsigned long *sc_sigmask(void *sc_ptr);
  40 extern int sc_get_fpregs(unsigned long buf, void *sc_ptr);
  41
  42 #endif
  43 /*
  44  * Overrides for Emacs so that we follow Linus's tabbing style.
  45  * Emacs will notice this stuff at the end of the file and automatically
  46  * adjust the settings for this buffer only.  This must remain at the end
  47  * of the file.
  48  * ---------------------------------------------------------------------------
  49  * Local variables:
  50  * c-file-style: "linux"
  51  * End:
  52  */