Add an implementation of _atomic_lock for sparc64. This was submitted by

des; I tweaked it slightly by extending the membar and making it match
the style of the rest of the sparc64 assembler code.

1 files changed, 45 insertions, 0 deletions

diff --git a/lib/libc_r/arch/sparc64/_atomic_lock.S b/lib/libc_r/arch/sparc64/_atomic_lock.S
new file mode 100644
index 0000000..ce931df
--- /dev/null
+++ b/lib/libc_r/arch/sparc64/_atomic_lock.S
@@ -0,0 +1,45 @@
+/*-
+ * Copyright (c) 2002 Dag-Erling Coïdan Smørgrav
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <machine/asm.h>
+
+__FBSDID("$FreeBSD$");
+
+/*
+ * long _atomic_lock(long *)
+ *
+ * Atomically acquire a lock by storing a non-zero value in its
+ * location, provided it is not already locked.  Note that we only use
+ * the first byte of the location provided.
+ */
+ENTRY(_atomic_lock)
+	ldstub	[%o0], %o1
+	membar	#LoadLoad | #StoreStore
+	retl
+	 mov	%o1, %o0
+END(_atomic_lock)