Enable java for aarch64

* configure.ac (aarch64-*-*): Don't disable java.
	* configure: Regenerate.

libjava/:
	* configure.host: Add support for aarch64.
	* sysdep/aarch64/locks.h: New file.

libjava/classpath/:
	* native/fdlibm/ieeefp.h: Add support for aarch64.

From-SVN: r197997

ChangeLog

@@ -1,3 +1,8 @@
+2013-04-16  Andreas Schwab  <schwab@suse.de>
+
+	* configure.ac (aarch64-*-*): Don't disable java.
+	* configure: Regenerate.
+
 2013-04-10  Chung-Ju Wu  <jasonwucj@gmail.com>
 
 	* MAINTAINERS (Write After Approval): Add myself.

configure

@@ -3272,6 +3272,8 @@ esac
 
 # Disable Java if libffi is not supported.
 case "${target}" in
+  aarch64-*-*)
+    ;;
   alpha*-*-*)
     ;;
   arm*-*-*)

configure.ac

@@ -611,6 +611,8 @@ esac
 
 # Disable Java if libffi is not supported.
 case "${target}" in
+  aarch64-*-*)
+    ;;
   alpha*-*-*)
     ;;
   arm*-*-*)

libjava/ChangeLog

@@ -1,3 +1,8 @@
+2013-04-16  Andreas Schwab  <schwab@suse.de>
+
+	* configure.host: Add support for aarch64.
+	* sysdep/aarch64/locks.h: New file.
+
 2013-03-12  Andrew John Hughes  <gnu.andrew@redhat.com>
 
 	* include/posix-threads.h:

libjava/classpath/ChangeLog.gcj

@@ -1,3 +1,7 @@
+2013-04-16  Andreas Schwab  <schwab@suse.de>
+
+	* native/fdlibm/ieeefp.h: Add support for aarch64.
+
 2013-02-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/56258

libjava/classpath/native/fdlibm/ieeefp.h

@@ -4,6 +4,14 @@
 #ifndef __IEEE_BIG_ENDIAN
 #ifndef __IEEE_LITTLE_ENDIAN
 
+#ifdef __aarch64__
+#ifdef __AARCH64EB__
+#define __IEEE_BIG_ENDIAN
+#else
+#define __IEEE_LITTLE_ENDIAN
+#endif
+#endif
+
 #ifdef __alpha__
 #define __IEEE_LITTLE_ENDIAN
 #endif

libjava/configure.host

@@ -81,6 +81,11 @@ ATOMICSPEC=
 
 # This case statement supports per-CPU defaults.
 case "${host}" in
+  aarch64*-linux*)
+	libgcj_interpreter=yes
+	sysdeps_dir=aarch64
+	ATOMICSPEC=-fuse-atomic-builtins
+	;;
   arm*-elf)
 	with_libffi_default=no
 	PROCESS=Ecos
@@ -289,6 +294,12 @@ EOF
 	sysdeps_dir=i386
 	DIVIDESPEC=-f%{m32:no-}use-divide-subroutine
 	;;
+  aarch64*-linux* )
+	slow_pthread_self=no
+	can_unwind_signal=no
+	CHECKREFSPEC=-fcheck-references
+	DIVIDESPEC=-fuse-divide-subroutine
+	;;
   arm*-linux* )
 	slow_pthread_self=no
 	can_unwind_signal=no

libjava/sysdep/aarch64/locks.h

@@ -0,0 +1,57 @@
+// locks.h - Thread synchronization primitives. AArch64 implementation.
+
+#ifndef __SYSDEP_LOCKS_H__
+#define __SYSDEP_LOCKS_H__
+
+typedef size_t obj_addr_t;	/* Integer type big enough for object	*/
+				/* address.				*/
+
+// Atomically replace *addr by new_val if it was initially equal to old.
+// Return true if the comparison succeeded.
+// Assumed to have acquire semantics, i.e. later memory operations
+// cannot execute before the compare_and_swap finishes.
+inline static bool
+compare_and_swap(volatile obj_addr_t *addr,
+                 obj_addr_t old,
+                 obj_addr_t new_val)
+{
+  return __sync_bool_compare_and_swap(addr, old, new_val);
+}
+
+// Set *addr to new_val with release semantics, i.e. making sure
+// that prior loads and stores complete before this
+// assignment.
+inline static void
+release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
+{
+  __sync_synchronize();
+  *addr = new_val;
+}
+
+// Compare_and_swap with release semantics instead of acquire semantics.
+// On many architecture, the operation makes both guarantees, so the
+// implementation can be the same.
+inline static bool
+compare_and_swap_release(volatile obj_addr_t *addr,
+			 obj_addr_t old,
+			 obj_addr_t new_val)
+{
+  return __sync_bool_compare_and_swap(addr, old, new_val);
+}
+
+// Ensure that subsequent instructions do not execute on stale
+// data that was loaded from memory before the barrier.
+inline static void
+read_barrier()
+{
+  __sync_synchronize();
+}
+
+// Ensure that prior stores to memory are completed with respect to other
+// processors.
+inline static void
+write_barrier()
+{
+  __sync_synchronize();
+}
+#endif