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atomic_cas.S revision 1.1.2.1 
      1 /*	$NetBSD: atomic_cas.S,v 1.1.2.1 2007/04/22 04:14:18 thorpej Exp $	*/
      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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include "atomic_op_asm.h"
     40 
     41 	.text
     42 
     43 ENTRY_NOPROFILE(_atomic_cas_8)
     44 	movl	%sp@(4), %a0
     45 	movb	%sp@(11), %d0
     46 	movb	%sp@(15), %d1
     47 	casb	%d0, %d1, %a0@
     48 	/* %d0[7..0] now contains the old value */
     49 	andl	#0xff, %d0
     50 	rts
     51 ATOMIC_OP_ALIAS(atomic_cas_8,_atomic_cas_8)
     52 ATOMIC_OP_ALIAS(atomic_cas_uchar,_atomic_cas_8)
     53 
     54 ENTRY_NOPROFILE(_atomic_cas_16)
     55 	movl	%sp@(4), %a0
     56 	movw	%sp@(10), %d0
     57 	movw	%sp@(14), %d1
     58 	casw	%d0, %d1, %a0@
     59 	/* %d0[15..0] now contains the old value */
     60 	andl	#0xffff, %d0
     61 	rts
     62 ATOMIC_OP_ALIAS(atomic_cas_16,_atomic_cas_16)
     63 ATOMIC_OP_ALIAS(atomic_cas_ushort,_atomic_cas_16)
     64 
     65 ENTRY_NOPROFILE(_atomic_cas_32)
     66 	movl	%sp@(4), %a0
     67 	movl	%sp@(8), %d0
     68 	movl	%sp@(12), %d1
     69 	casl	%d0, %d1, %a0@
     70 	/* %d0 now contains the old value */
     71 	movl	%d0, %a0	/* pointers return also in %a0 */
     72 	rts
     73 ATOMIC_OP_ALIAS(atomic_cas_32,_atomic_cas_32)
     74 ATOMIC_OP_ALIAS(atomic_cas_uint,_atomic_cas_32)
     75 ATOMIC_OP_ALIAS(atomic_cas_ulong,_atomic_cas_32)
     76 ATOMIC_OP_ALIAS(atomic_cas_ptr,_atomic_cas_32)
     77