/*	$NetBSD: atomic_sub.S,v 1.3 2014/06/23 21:53:45 joerg Exp $	*/

/*-
 * Copyright (c) 2007 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 * 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.
 *      
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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 "atomic_op_asm.h"

	.text
	.align	2

ENTRY(_atomic_sub_32)
	movl	4(%sp), %a0
	movl	8(%sp), %d0
	subl	%d0, (%a0)
	rts
END(_atomic_sub_32)
ATOMIC_OP_ALIAS(atomic_sub_32,_atomic_sub_32)
ATOMIC_OP_ALIAS(atomic_sub_int,_atomic_sub_32)
STRONG_ALIAS(_atomic_sub_int,_atomic_sub_32)
ATOMIC_OP_ALIAS(atomic_sub_long,_atomic_sub_32)
STRONG_ALIAS(_atomic_sub_long,_atomic_sub_32)
ATOMIC_OP_ALIAS(atomic_sub_ptr,_atomic_sub_32)
STRONG_ALIAS(_atomic_sub_ptr,_atomic_sub_32)

ENTRY(_atomic_sub_32_nv)
	movl	4(%sp), %a0
1:	movl	(%a0), %d0
	movl	%d0, %d1
	subl	8(%sp), %d0
	casl	%d1, %d0, (%a0)
	bne	1b
	movl	%d0, %a0	/* pointers return also in %a0 */
	rts
END(_atomic_sub_32_nv)

ATOMIC_OP_ALIAS(atomic_sub_32_nv,_atomic_sub_32_nv)
ATOMIC_OP_ALIAS(atomic_sub_int_nv,_atomic_sub_32_nv)
STRONG_ALIAS(_atomic_sub_int_nv,_atomic_sub_32_nv)
ATOMIC_OP_ALIAS(atomic_sub_long_nv,_atomic_sub_32_nv)
STRONG_ALIAS(_atomic_sub_long_nv,_atomic_sub_32_nv)
ATOMIC_OP_ALIAS(atomic_sub_ptr_nv,_atomic_sub_32_nv)
STRONG_ALIAS(_atomic_sub_ptr_nv,_atomic_sub_32_nv)
CRT_ALIAS(__sync_sub_and_fetch_4,_atomic_sub_32_nv)

ENTRY(__sync_fetch_and_sub_4)
	movl	4(%sp), %a0
1:	movl	(%a0), %d0
	movl	%d0, %d1
	subl	8(%sp), %d1
	casl	%d0, %d1, (%a0)
	bne	1b
	movl	%d0, %a0	/* pointers return also in %a0 */
	rts
END(__sync_fetch_and_sub_4)

ENTRY(_atomic_sub_16_nv)
	movl	4(%sp), %a0
1:	movw	(%a0), %d0
	movw	%d0, %d1
	subw	8(%sp), %d0
	casw	%d1, %d0, (%a0)
	bne	1b
	rts
END(_atomic_sub_16_nv)

CRT_ALIAS(__sync_sub_and_fetch_2,_atomic_sub_16_nv)

ENTRY(__sync_fetch_and_sub_2)
	movl	4(%sp), %a0
1:	movw	(%a0), %d0
	movw	%d0, %d1
	subw	8(%sp), %d1
	casw	%d0, %d1, (%a0)
	bne	1b
	rts
END(__sync_fetch_and_sub_2)

ENTRY(_atomic_sub_8_nv)
	movl	4(%sp), %a0
1:	movb	(%a0), %d0
	movb	%d0, %d1
	subb	8(%sp), %d0
	casb	%d1, %d0, (%a0)
	bne	1b
	rts
END(_atomic_sub_8_nv)

CRT_ALIAS(__sync_sub_and_fetch_1,_atomic_sub_8_nv)

ENTRY(__sync_fetch_and_sub_1)
	movl	4(%sp), %a0
1:	movb	(%a0), %d0
	movb	%d0, %d1
	subb	8(%sp), %d1
	casb	%d0, %d1, (%a0)
	bne	1b
	rts
END(__sync_fetch_and_sub_1)

CRT_ALIAS(__atomic_fetch_sub_1,__sync_fetch_and_sub_1)
CRT_ALIAS(__atomic_fetch_sub_2,__sync_fetch_and_sub_2)
CRT_ALIAS(__atomic_fetch_sub_4,__sync_fetch_and_sub_4)