Annotation of src/common/lib/libc/arch/m68k/atomic/atomic_swap.S, Revision 1.5
1.5 ! matt 1: /* $NetBSD: atomic_swap.S,v 1.4 2008/05/25 15:56:11 chs Exp $ */
1.2 ad 2:
3: /*-
4: * Copyright (c) 2007 The NetBSD Foundation, Inc.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Jason R. Thorpe.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29: * POSSIBILITY OF SUCH DAMAGE.
30: */
31:
32: #include "atomic_op_asm.h"
33:
34: .text
35:
1.4 chs 36: ENTRY(_atomic_swap_32)
1.5 ! matt 37: movl 4(%sp), %a0
! 38: 1: movl (%a0), %d0
! 39: movl 8(%sp), %d1
1.2 ad 40: casl %d0, %d1, %a0@
41: bne 1b
42: /* %d0 now contains the old value */
43: movl %d0, %a0 /* pointers return also in %a0 */
44: rts
45: ATOMIC_OP_ALIAS(atomic_swap_32,_atomic_swap_32)
46: ATOMIC_OP_ALIAS(atomic_swap_uint,_atomic_swap_32)
47: STRONG_ALIAS(_atomic_swap_uint,_atomic_swap_32)
48: ATOMIC_OP_ALIAS(atomic_swap_ulong,_atomic_swap_32)
49: STRONG_ALIAS(_atomic_swap_ulong,_atomic_swap_32)
50: ATOMIC_OP_ALIAS(atomic_swap_ptr,_atomic_swap_32)
51: STRONG_ALIAS(_atomic_swap_ptr,_atomic_swap_32)
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