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      1 /*	$NetBSD: atomic_cas.S,v 1.9 2022/02/27 19:21:53 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <machine/asm.h>
     30 #include "atomic_op_asm.h"
     31 
     32 RCSID("$NetBSD: atomic_cas.S,v 1.9 2022/02/27 19:21:53 riastradh Exp $")
     33 
     34 	.text
     35 	.set	noat
     36 	.set	noreorder
     37 	.set	nomacro
     38 
     39 LEAF(_atomic_cas_32)
     40 	LLSCSYNC
     41 1:	INT_LL		v0, 0(a0)
     42 	 nop
     43 	bne		v0, a1, 2f
     44 	 nop
     45 	move		t0, a2
     46 	INT_SC		t0, 0(a0)
     47 	beq		t0, zero, 1b
     48  	 nop
     49 	move		v0, a1
     50 	SYNC_PLUNGER
     51 2:
     52 	j		ra
     53 	 nop
     54 END(_atomic_cas_32)
     55 ATOMIC_OP_ALIAS(atomic_cas_32, _atomic_cas_32)
     56 ATOMIC_OP_ALIAS(atomic_cas_32_ni, _atomic_cas_32)
     57 
     58 #if !defined(__mips_o32)
     59 LEAF(_atomic_cas_64)
     60 	LLSCSYNC
     61 1:	REG_LL		v0, 0(a0)
     62 	 nop
     63 	bne		v0, a1, 2f
     64 	 nop
     65 	move		t0, a2
     66 	REG_SC		t0, 0(a0)
     67 	beq		t0, zero, 1b
     68  	 nop
     69 	move		v0, a1
     70 	SYNC_PLUNGER
     71 2:
     72 	j		ra
     73 	 nop
     74 END(_atomic_cas_64)
     75 ATOMIC_OP_ALIAS(atomic_cas_64, _atomic_cas_64)
     76 ATOMIC_OP_ALIAS(atomic_cas_64_ni, _atomic_cas_64)
     77 #endif
     78 
     79 #ifdef _LP64
     80 STRONG_ALIAS(_atomic_cas_ptr,		_atomic_cas_64)
     81 STRONG_ALIAS(_atomic_cas_ptr_ni,	_atomic_cas_64)
     82 STRONG_ALIAS(_atomic_cas_ulong,		_atomic_cas_64)
     83 STRONG_ALIAS(_atomic_cas_ulong_ni,	_atomic_cas_64)
     84 #else
     85 STRONG_ALIAS(_atomic_cas_ptr,		_atomic_cas_32)
     86 STRONG_ALIAS(_atomic_cas_ptr_ni,	_atomic_cas_32)
     87 STRONG_ALIAS(_atomic_cas_ulong,		_atomic_cas_32)
     88 STRONG_ALIAS(_atomic_cas_ulong_ni,	_atomic_cas_32)
     89 #endif
     90 STRONG_ALIAS(_atomic_cas_uint,		_atomic_cas_32)
     91 STRONG_ALIAS(_atomic_cas_uint_ni,	_atomic_cas_32)
     92 
     93 ATOMIC_OP_ALIAS(atomic_cas_ptr,		_atomic_cas_ptr)
     94 ATOMIC_OP_ALIAS(atomic_cas_ptr_ni,	_atomic_cas_ptr_ni)
     95 ATOMIC_OP_ALIAS(atomic_cas_uint,	_atomic_cas_uint)
     96 ATOMIC_OP_ALIAS(atomic_cas_uint_ni,	_atomic_cas_uint_ni)
     97 ATOMIC_OP_ALIAS(atomic_cas_ulong,	_atomic_cas_ulong)
     98 ATOMIC_OP_ALIAS(atomic_cas_ulong_ni,	_atomic_cas_ulong_ni)
     99