From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001
From: upstream source tree <ports@midipix.org>
Date: Sun, 15 Mar 2015 20:14:05 -0400
Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified
 gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream
 tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.
---
 libjava/include/powerpc-signal.h | 113 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 libjava/include/powerpc-signal.h

(limited to 'libjava/include/powerpc-signal.h')

diff --git a/libjava/include/powerpc-signal.h b/libjava/include/powerpc-signal.h
new file mode 100644
index 000000000..9c6ddac37
--- /dev/null
+++ b/libjava/include/powerpc-signal.h
@@ -0,0 +1,113 @@
+// powerpc-signal.h - Catch runtime signals and turn them into exceptions
+// on a powerpc based Linux system.
+
+/* Copyright (C) 2003, 2006  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>
+
+#define HANDLE_SEGV 1
+#undef HANDLE_FPE
+
+#define SIGNAL_HANDLER(_name)						\
+  static void _name (int /* _signal */, struct sigcontext *_sc)
+
+/* MD_FALLBACK_FRAME_STATE_FOR takes care of special casing PC
+   before the faulting instruction, so we don't need to do anything
+   here.  */
+
+#define MAKE_THROW_FRAME(_exception)
+
+/* For an explanation why we cannot simply use sigaction to
+   install the handlers, see i386-signal.h.  */
+
+/* We use kernel_old_sigaction here because we're calling the kernel
+   directly rather than via glibc. The sigaction structure that the
+   syscall uses is a different shape from the one in userland and not
+   visible to us in a header file so we define it here.
+   Additionally we want a proper prototype for the handler function
+   with the struct sigcontext pointer passed by the kernel as the 2nd
+   argument, which isn't there in userland headers.
+
+   Note that we explicitly avoid the SA_SIGINFO flag in INIT_SEGV and
+   INIT_FPE below. Using the ucontext pointer passed as 3rd argument
+   of a SA_SIGINFO type handler would need complicated backwards
+   compatibility hacks in MAKE_THROW_FRAME, as the ucontext layout
+   on PPC changed during the 2.5 kernel series.  */
+
+#ifndef __powerpc64__
+struct kernel_old_sigaction {
+  void (*k_sa_handler) (int, struct sigcontext *);
+  unsigned long k_sa_mask;
+  unsigned long k_sa_flags;
+  void (*k_sa_restorer) (void);
+};
+
+#define INIT_SEGV							\
+do									\
+  {									\
+    struct kernel_old_sigaction kact;					\
+    kact.k_sa_handler = catch_segv;					\
+    kact.k_sa_mask = 0;							\
+    kact.k_sa_flags = 0;						\
+    if (syscall (SYS_sigaction, SIGSEGV, &kact, NULL) != 0)		\
+      __asm__ __volatile__ (".long 0");					\
+  }									\
+while (0)  
+
+#define INIT_FPE							\
+do									\
+  {									\
+    struct kernel_old_sigaction kact;					\
+    kact.k_sa_handler = catch_fpe;					\
+    kact.k_sa_mask = 0;							\
+    kact.k_sa_flags = 0;						\
+    if (syscall (SYS_sigaction, SIGFPE, &kact, NULL) != 0)		\
+      __asm__ __volatile__ (".long 0");					\
+  }									\
+while (0)
+
+#else /* powerpc64 */
+
+struct kernel_sigaction
+{
+  void (*k_sa_handler) (int, struct sigcontext *);
+  unsigned long k_sa_flags;
+  void (*k_sa_restorer)(void);
+  unsigned long k_sa_mask;
+};
+
+#define INIT_SEGV							\
+do									\
+  {									\
+    struct kernel_sigaction kact;					\
+    memset (&kact, 0, sizeof (kact));					\
+    kact.k_sa_handler = catch_segv;					\
+    if (syscall (SYS_rt_sigaction, SIGSEGV, &kact, NULL, 8) != 0)	\
+      __asm__ __volatile__ (".long 0");					\
+  }									\
+while (0)  
+
+#define INIT_FPE							\
+do									\
+  {									\
+    struct kernel_sigaction kact;					\
+    memset (&kact, 0, sizeof (kact));					\
+    kact.k_sa_handler = catch_fpe;					\
+    if (syscall (SYS_rt_sigaction, SIGFPE, &kact, NULL, 8) != 0)	\
+      __asm__ __volatile__ (".long 0");					\
+  }									\
+while (0)
+#endif
+
+#endif /* JAVA_SIGNAL_H */
-- 
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