m68k/atomic/atomic_swap.S

1.4.2.1  yamt /*	$NetBSD: atomic_swap.S,v 1.4.2.1 2014/05/22 11:26:29 yamt 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)
1.4.2.1  yamt 	movl	4(%sp), %a0
1.4.2.1  yamt 1:	movl	(%a0), %d0
1.4.2.1  yamt 	movl	8(%sp), %d1
1.4.2.1  yamt 	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
1.4.2.1  yamt 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)
1.4.2.1  yamt CRT_ALIAS(__sync_lock_test_and_set_4,_atomic_swap_32)
1.4.2.1  yamt
1.4.2.1  yamt
1.4.2.1  yamt ENTRY(_atomic_swap_16)
1.4.2.1  yamt 	movl	4(%sp), %a0
1.4.2.1  yamt 1:	movw	(%a0), %d0
1.4.2.1  yamt 	movw	8(%sp), %d1
1.4.2.1  yamt 	casw	%d0, %d1, (%a0)
1.4.2.1  yamt 	bne	1b
1.4.2.1  yamt 	/* %d0 now contains the old value */
1.4.2.1  yamt 	rts
1.4.2.1  yamt END(_atomic_swap_16)
1.4.2.1  yamt ATOMIC_OP_ALIAS(atomic_swap_16,_atomic_swap_16)
1.4.2.1  yamt CRT_ALIAS(__sync_lock_test_and_set_2,_atomic_swap_16)
1.4.2.1  yamt
1.4.2.1  yamt ENTRY(_atomic_swap_8)
1.4.2.1  yamt 	movl	4(%sp), %a0
1.4.2.1  yamt 1:	movb	(%a0), %d0
1.4.2.1  yamt 	movb	8(%sp), %d1
1.4.2.1  yamt 	casb	%d0, %d1, (%a0)
1.4.2.1  yamt 	bne	1b
1.4.2.1  yamt 	/* %d0 now contains the old value */
1.4.2.1  yamt 	rts
1.4.2.1  yamt END(_atomic_swap_8)
1.4.2.1  yamt ATOMIC_OP_ALIAS(atomic_swap_8,_atomic_swap_8)
1.4.2.1  yamt CRT_ALIAS(__sync_lock_test_and_set_1,_atomic_swap_8)