libjava/include/s390-signal.h

   1 // s390-signal.h - Catch runtime signals and turn them into exceptions
   2 // on an s390 based Linux system.
   3
   4 /* Copyright (C) 2002  Free Software Foundation
   5
   6    This file is part of libgcj.
   7
   8 This software is copyrighted work licensed under the terms of the
   9 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
  10 details.  */
  11
  12
  13 #ifndef JAVA_SIGNAL_H
  14 #define JAVA_SIGNAL_H 1
  15
  16 #include <signal.h>
  17 #include <sys/syscall.h>
  18
  19 #define HANDLE_SEGV 1
  20 #undef HANDLE_FPE
  21
  22 #define SIGNAL_HANDLER(_name)   \
  23 static void _name (int /* _signal */, struct sigcontext _sc)
  24
  25 #define MAKE_THROW_FRAME(_exception)                                    \
  26 do                                                                      \
  27 {                                                                       \
  28   /* Advance the program counter so that it is after the start of the   \
  29      instruction:  the s390 exception handler expects the PSW to point  \
  30      to the instruction after a call. */                                \
  31   _sc.sregs->regs.psw.addr += 2;                                        \
  32                                                                         \
  33 }                                                                       \
  34 while (0)
  35
  36
  37 /* For an explanation why we cannot simply use sigaction to
  38    install the handlers, see i386-signal.h.  */
  39
  40 /* We use old_kernel_sigaction here because we're calling the kernel
  41    directly rather than via glibc.  The sigaction structure that the
  42    syscall uses is a different shape from the one in userland and not
  43    visible to us in a header file so we define it here.  */
  44
  45 struct old_s390_kernel_sigaction {
  46         void (*k_sa_handler) (int, struct sigcontext);
  47         unsigned long k_sa_mask;
  48         unsigned long k_sa_flags;
  49         void (*sa_restorer) (void);
  50 };
  51
  52 #define INIT_SEGV                                       \
  53 do                                                      \
  54   {                                                     \
  55     nullp = new java::lang::NullPointerException ();    \
  56     struct old_s390_kernel_sigaction kact;              \
  57     kact.k_sa_handler = catch_segv;                     \
  58     kact.k_sa_mask = 0;                                 \
  59     kact.k_sa_flags = 0;                                \
  60     syscall (SYS_sigaction, SIGSEGV, &kact, NULL);      \
  61   }                                                     \
  62 while (0)
  63
  64 #define INIT_FPE                                                \
  65 do                                                              \
  66   {                                                             \
  67     arithexception = new java::lang::ArithmeticException        \
  68       (JvNewStringLatin1 ("/ by zero"));                        \
  69     struct old_s390_kernel_sigaction kact;                      \
  70     kact.k_sa_handler = catch_fpe;                              \
  71     kact.k_sa_mask = 0;                                         \
  72     kact.k_sa_flags = 0;                                        \
  73     syscall (SYS_sigaction, SIGFPE, &kact, NULL);               \
  74   }                                                             \
  75 while (0)
  76
  77 #endif /* JAVA_SIGNAL_H */
  78