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      1 /*	$NetBSD: atomic_dec_32.S,v 1.1 2014/09/03 19:34:25 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas of 3am Software Foundry.
      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 ENTRY_NP(_atomic_dec_32)
     35 1:	l.lwa	r11, 0(r3)		/* load old value */
     36 	l.addi	r5, r11, -1		/* calculate new value */
     37 	l.swa	0(r3), r5		/* try to store */
     38 	l.bnf	1b			/*   succeed? no, try again */
     39 	l.nop				/* -- delay slot -- */
     40 	l.jr	lr			/* return old value */
     41 	l.nop
     42 END(_atomic_dec_32)
     43 
     44 ATOMIC_OP_ALIAS(atomic_dec_32,_atomic_dec_32)
     45 ATOMIC_OP_ALIAS(atomic_dec_uint,_atomic_dec_32)
     46 ATOMIC_OP_ALIAS(atomic_dec_ulong,_atomic_dec_32)
     47 ATOMIC_OP_ALIAS(atomic_dec_ptr,_atomic_dec_32)
     48 STRONG_ALIAS(_atomic_dec_uint,_atomic_dec_32)
     49 STRONG_ALIAS(_atomic_dec_ulong,_atomic_dec_32)
     50 STRONG_ALIAS(_atomic_dec_ptr,_atomic_dec_32)
     51 
     52 ENTRY_NP(_atomic_dec_32_nv)
     53 1:	l.lwa	r5, 0(r3)		/* load old value */
     54 	l.addi	r11, r5, -1		/* calculate new value */
     55 	l.swa	0(r3), r11		/* try to store */
     56 	l.bnf	1b			/*   succeed? no, try again */
     57 	l.nop				/* -- delay slot -- */
     58 	l.jr	lr			/* return old value */
     59 	l.nop
     60 END(_atomic_dec_32_nv)
     61 
     62 ATOMIC_OP_ALIAS(atomic_dec_32_nv,_atomic_dec_32_nv)
     63 ATOMIC_OP_ALIAS(atomic_dec_uint_nv,_atomic_dec_32_nv)
     64 ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,_atomic_dec_32_nv)
     65 ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,_atomic_dec_32_nv)
     66 STRONG_ALIAS(_atomic_dec_uint_nv,_atomic_dec_32_nv)
     67 STRONG_ALIAS(_atomic_dec_ulong_nv,_atomic_dec_32_nv)
     68 STRONG_ALIAS(_atomic_dec_ptr_nv,_atomic_dec_32_nv)
     69