libjava/include/i386-signal.h

   1 // i386-signal.h - Catch runtime signals and turn them into exceptions.
   2
   3 /* Copyright (C) 1998, 1999  Cygnus Solutions
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 /* This technique should work for all i386 based Unices which conform
  12  * to iBCS2.  This includes all versions of Linux more recent than 1.3
  13  */
  14
  15
  16 #ifndef JAVA_SIGNAL_H
  17 #define JAVA_SIGNAL_H 1
  18
  19 #include <signal.h>
  20
  21 #define HANDLE_SEGV 1
  22 #define HANDLE_FPE 1
  23
  24 #define SIGNAL_HANDLER(_name)   \
  25 static void _name (int _dummy)
  26
  27 #define MAKE_THROW_FRAME                                                \
  28 {                                                                       \
  29   void **_p = (void **)&_dummy;                                         \
  30   struct sigcontext_struct *_regs = (struct sigcontext_struct *)++_p;   \
  31                                                                         \
  32   register unsigned long _ebp = _regs->ebp;                             \
  33   register unsigned long _eip = _regs->eip;                             \
  34                                                                         \
  35   asm volatile ("mov %0, (%%ebp); mov %1, 4(%%ebp)"                     \
  36                 : : "r"(_ebp), "r"(_eip));                              \
  37 }
  38
  39 #define INIT_SEGV                                               \
  40 do                                                              \
  41   {                                                             \
  42     nullp = new java::lang::NullPointerException ();            \
  43     struct sigaction act;                                       \
  44     act.sa_handler = catch_segv;                                \
  45     sigemptyset (&act.sa_mask);                                 \
  46     act.sa_flags = 0;                                           \
  47     sigaction (SIGSEGV, &act, NULL);                            \
  48   }                                                             \
  49 while (0)
  50
  51 #define INIT_FPE                                                \
  52 do                                                              \
  53   {                                                             \
  54     arithexception = new java::lang::ArithmeticException ();    \
  55     struct sigaction act;                                       \
  56     act.sa_handler = catch_fpe;                                 \
  57     sigemptyset (&act.sa_mask);                                 \
  58     act.sa_flags = 0;                                           \
  59     sigaction (SIGFPE, &act, NULL);                             \
  60   }                                                             \
  61 while (0)
  62
  63 #endif /* JAVA_SIGNAL_H */
  64