1 files changed, 96 insertions, 0 deletions
diff --git a/libjava/include/x86_64-signal.h b/libjava/include/x86_64-signal.h
new file mode 100644
index 00000000000..fed55d1ce6e
--- /dev/null
+++ b/libjava/include/x86_64-signal.h
@@ -0,0 +1,96 @@
+// x86_64-signal.h - Catch runtime signals and turn them into exceptions
+// on an x86_64 based GNU/Linux system.
+
+/* Copyright (C) 2003  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+
+#ifndef JAVA_SIGNAL_H
+#define JAVA_SIGNAL_H 1
+
+#include <signal.h>
+#include <sys/syscall.h>
+
+#ifdef __x86_64__
+
+#define HANDLE_SEGV 1
+
+#define SIGNAL_HANDLER(_name)	\
+static void _Jv_##_name (int, siginfo_t *, void *_p)
+
+extern "C" 
+{
+  struct kernel_sigaction 
+  {
+    void (*k_sa_sigaction)(int,siginfo_t *,void *);
+    unsigned long k_sa_flags;
+    void (*k_sa_restorer) (void);
+    sigset_t k_sa_mask;
+  };
+}
+
+#define MAKE_THROW_FRAME(_exception)					\
+do									\
+{									\
+  /* Advance the program counter so that it is after the start of the	\
+     instruction:  the x86_64 exception handler expects			\
+     the PC to point to the instruction after a call. */		\
+  struct ucontext *_uc = (struct ucontext *)_p;				\
+  volatile struct sigcontext *_sc = (struct sigcontext *) &_uc->uc_mcontext; \
+  _sc->rip += 2;							\
+}									\
+while (0)
+
+#define RESTORE(name, syscall) RESTORE2 (name, syscall)
+#define RESTORE2(name, syscall)			\
+asm						\
+  (						\
+   ".byte 0  # Yes, this really is necessary\n" \
+   ".align 16\n"				\
+   "__" #name ":\n"				\
+   "	movq $" #syscall ", %rax\n"		\
+   "	syscall\n"				\
+   );
+
+/* The return code for realtime-signals.  */
+RESTORE (restore_rt, __NR_rt_sigreturn)
+static void restore_rt (void) asm ("__restore_rt");
+
+#define INIT_SEGV						\
+do								\
+  {								\
+    nullp = new java::lang::NullPointerException ();		\
+    struct kernel_sigaction act;				\
+    act.k_sa_sigaction = _Jv_catch_segv;			\
+    sigemptyset (&act.k_sa_mask);				\
+    act.k_sa_flags = SA_SIGINFO|0x4000000;			\
+    act.k_sa_restorer = restore_rt;				\
+    syscall (SYS_rt_sigaction, SIGSEGV, &act, NULL, _NSIG / 8);	\
+  }								\
+while (0)  
+
+/* We use syscall(SYS_rt_sigaction) in INIT_SEGV instead of
+ * sigaction() because on some systems the pthreads wrappers for
+ * signal handlers are not compiled with unwind information, so it's
+ * not possible to unwind through them.  This is a problem that will
+ * go away if all systems ever have pthreads libraries that are
+ * compiled with unwind info.  */
+
+#else /* __x86_64__ */
+
+/* This is for the 32-bit subsystem on on x86-64.  Catching signals
+   doesn't yet work on that target.  */
+
+#undef HANDLE_SEGV
+#undef HANDLE_FPE
+
+#define INIT_SEGV   do {} while (0)
+#define INIT_FPE   do {} while (0)
+
+#endif /* __x86_64__ */
+#endif /* JAVA_SIGNAL_H */