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/sysdep/sparc/locks.h | 142 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 libjava/sysdep/sparc/locks.h

(limited to 'libjava/sysdep/sparc')

diff --git a/libjava/sysdep/sparc/locks.h b/libjava/sysdep/sparc/locks.h
new file mode 100644
index 000000000..7c30d7c3b
--- /dev/null
+++ b/libjava/sysdep/sparc/locks.h
@@ -0,0 +1,142 @@
+// locks.h - Thread synchronization primitives. Sparc implementation.
+
+/* Copyright (C) 2002, 2007  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 __SYSDEP_LOCKS_H__
+#define __SYSDEP_LOCKS_H__
+
+typedef size_t obj_addr_t;	/* Integer type big enough for object	*/
+				/* address.				*/
+
+#ifdef __arch64__
+/* Sparc64 implementation, use cas instruction.  */
+inline static bool
+compare_and_swap(volatile obj_addr_t *addr,
+		 obj_addr_t old,
+		 obj_addr_t new_val)
+{
+  __asm__ __volatile__("casx [%2], %3, %0\n\t"
+		       "membar #StoreLoad | #StoreStore"
+		       : "=&r" (new_val)
+		       : "0" (new_val), "r" (addr), "r" (old)
+		       : "memory");
+
+  return (new_val == old) ? true : false;
+}
+
+inline static void
+release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
+{
+  __asm__ __volatile__("membar #StoreStore | #LoadStore" : : : "memory");
+  *(addr) = new_val;
+}
+
+inline static bool
+compare_and_swap_release(volatile obj_addr_t *addr, obj_addr_t old,
+			 obj_addr_t new_val)
+{
+  return compare_and_swap(addr, old, new_val);
+}
+
+inline static void
+read_barrier()
+{
+  __asm__ __volatile__("membar #LoadLoad | #LoadStore" : : : "memory");
+}
+
+inline static void
+write_barrier()
+{
+  __asm__ __volatile__("membar #StoreLoad | #StoreStore" : : : "memory");
+}
+#else
+/* Sparc32 implementation, use a spinlock.  */
+static unsigned char __cas_lock = 0;
+
+inline static void
+__cas_start_atomic(void)
+{
+  unsigned int tmp;
+  __asm__ __volatile__(
+"1:	ldstub	[%1], %0\n"
+"	orcc	%0, 0x0, %%g0\n"
+"	be	3f\n"
+"	 nop\n"
+"2:	ldub	[%1], %0\n"
+"	orcc	%0, 0x0, %%g0\n"
+"	bne	2b\n"
+"	 nop\n"
+"3:"	: "=&r" (tmp)
+	: "r" (&__cas_lock)
+	: "memory", "cc");
+}
+
+inline static void
+__cas_end_atomic(void)
+{
+  __asm__ __volatile__(
+  "stb %%g0, [%0]"
+  : /* no outputs */
+  : "r" (&__cas_lock)
+  : "memory");
+}
+
+inline static bool
+compare_and_swap(volatile obj_addr_t *addr,
+		 obj_addr_t old,
+		 obj_addr_t new_val)
+{
+  bool ret;
+
+  __cas_start_atomic ();
+  if (*addr != old)
+    {
+      ret = false;
+    }
+  else
+    {
+      *addr = new_val;
+      ret = true;
+    }
+  __cas_end_atomic ();
+
+  return ret;
+}
+
+inline static void
+release_set(volatile obj_addr_t *addr, obj_addr_t new_val)
+{
+  /* Technically stbar would be needed here but no sparc32
+     system actually requires it.  Also the stbar would mean
+     this code would not work on sparcv7 chips.  */
+  __asm__ __volatile__("" : : : "memory");
+  *(addr) = new_val;
+}
+
+inline static bool
+compare_and_swap_release(volatile obj_addr_t *addr, obj_addr_t old,
+			 obj_addr_t new_val)
+{
+  return compare_and_swap(addr, old, new_val);
+}
+
+inline static void
+read_barrier()
+{
+  __asm__ __volatile__ ("" : : : "memory");
+}
+
+inline static void
+write_barrier()
+{
+  __asm__ __volatile__ ("" : : : "memory");
+}
+#endif /* __arch64__ */
+
+#endif /* ! __SYSDEP_LOCKS_H__ */
-- 
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