m68k/atomic/atomic_swap.S

1.7  martin /*	$NetBSD: atomic_swap.S,v 1.7 2014/02/18 16:19:28 martin Exp $	*/
1.2      ad
1.2      ad /*-
1.2      ad  * Copyright (c) 2007 The NetBSD Foundation, Inc.
1.2      ad  * All rights reserved.
1.2      ad  *
1.2      ad  * This code is derived from software contributed to The NetBSD Foundation
1.2      ad  * by Jason R. Thorpe.
1.2      ad  *
1.2      ad  * Redistribution and use in source and binary forms, with or without
1.2      ad  * modification, are permitted provided that the following conditions
1.2      ad  * are met:
1.2      ad  * 1. Redistributions of source code must retain the above copyright
1.2      ad  *    notice, this list of conditions and the following disclaimer.
1.2      ad  * 2. Redistributions in binary form must reproduce the above copyright
1.2      ad  *    notice, this list of conditions and the following disclaimer in the
1.2      ad  *    documentation and/or other materials provided with the distribution.
1.2      ad  *
1.2      ad  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
1.2      ad  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
1.2      ad  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1.2      ad  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
1.2      ad  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.2      ad  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.2      ad  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.2      ad  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.2      ad  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.2      ad  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.2      ad  * POSSIBILITY OF SUCH DAMAGE.
1.2      ad  */
1.2      ad
1.2      ad #include "atomic_op_asm.h"
1.2      ad
1.2      ad 	.text
1.2      ad
1.4     chs ENTRY(_atomic_swap_32)
1.5    matt 	movl	4(%sp), %a0
1.5    matt 1:	movl	(%a0), %d0
1.5    matt 	movl	8(%sp), %d1
1.6    matt 	casl	%d0, %d1, (%a0)
1.2      ad 	bne	1b
1.2      ad 	/* %d0 now contains the old value */
1.2      ad 	movl	%d0, %a0	/* pointers return also in %a0 */
1.2      ad 	rts
1.6    matt END(_atomic_swap_32)
1.2      ad ATOMIC_OP_ALIAS(atomic_swap_32,_atomic_swap_32)
1.2      ad ATOMIC_OP_ALIAS(atomic_swap_uint,_atomic_swap_32)
1.2      ad STRONG_ALIAS(_atomic_swap_uint,_atomic_swap_32)
1.2      ad ATOMIC_OP_ALIAS(atomic_swap_ulong,_atomic_swap_32)
1.2      ad STRONG_ALIAS(_atomic_swap_ulong,_atomic_swap_32)
1.2      ad ATOMIC_OP_ALIAS(atomic_swap_ptr,_atomic_swap_32)
1.2      ad STRONG_ALIAS(_atomic_swap_ptr,_atomic_swap_32)
1.7  martin STRONG_ALIAS(__sync_lock_test_and_set_4,_atomic_swap_32)
1.7  martin
1.7  martin
1.7  martin ENTRY(_atomic_swap_16)
1.7  martin 	movl	4(%sp), %a0
1.7  martin 1:	movw	(%a0), %d0
1.7  martin 	movw	8(%sp), %d1
1.7  martin 	casw	%d0, %d1, (%a0)
1.7  martin 	bne	1b
1.7  martin 	/* %d0 now contains the old value */
1.7  martin 	rts
1.7  martin END(_atomic_swap_16)
1.7  martin ATOMIC_OP_ALIAS(atomic_swap_16,_atomic_swap_16)
1.7  martin STRONG_ALIAS(__sync_lock_test_and_set_2,_atomic_swap_16)
1.7  martin
1.7  martin ENTRY(_atomic_swap_8)
1.7  martin 	movl	4(%sp), %a0
1.7  martin 1:	movb	(%a0), %d0
1.7  martin 	movb	8(%sp), %d1
1.7  martin 	casb	%d0, %d1, (%a0)
1.7  martin 	bne	1b
1.7  martin 	/* %d0 now contains the old value */
1.7  martin 	rts
1.7  martin END(_atomic_swap_8)
1.7  martin ATOMIC_OP_ALIAS(atomic_swap_8,_atomic_swap_8)
1.7  martin STRONG_ALIAS(__sync_lock_test_and_set_1,_atomic_swap_8)