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      1 /*	$NetBSD: atomic_sub_32.S,v 1.2 2015/03/27 06:42:37 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 	li		a1, 1
     36 ENTRY_NP(_atomic_sub_32)
     37 	INT_SUB		t0, zero, a1
     38 	amoadd.w.aq	a0, t0, 0(a0)
     39 	ret
     40 END(_atomic_sub_32)
     41 END(_atomic_dec_32)
     42 
     43 ATOMIC_OP_ALIAS(atomic_sub_32,_atomic_sub_32)
     44 ATOMIC_OP_ALIAS(atomic_sub_int,_atomic_sub_32)
     45 STRONG_ALIAS(_atomic_sub_int,_atomic_sub_32)
     46 #ifndef _LP64
     47 ATOMIC_OP_ALIAS(atomic_sub_long,_atomic_sub_32)
     48 STRONG_ALIAS(_atomic_sub_long,_atomic_sub_32)
     49 ATOMIC_OP_ALIAS(atomic_sub_ptr,_atomic_sub_32)
     50 STRONG_ALIAS(_atomic_sub_ptr,_atomic_sub_32)
     51 #endif
     52 CRT_ALIAS(__sync_fetch_and_sub_4,_atomic_sub_32)
     53 CRT_ALIAS(__atomic_fetch_sub_4,_atomic_sub_32)
     54 
     55 ATOMIC_OP_ALIAS(atomic_dec_32,_atomic_dec_32)
     56 ATOMIC_OP_ALIAS(atomic_dec_uint,_atomic_dec_32)
     57 STRONG_ALIAS(_atomic_dec_uint,_atomic_dec_32)
     58 #ifndef _LP64
     59 ATOMIC_OP_ALIAS(atomic_dec_ulong,_atomic_dec_32)
     60 STRONG_ALIAS(_atomic_dec_ulong,_atomic_dec_32)
     61 ATOMIC_OP_ALIAS(atomic_dec_ptr,_atomic_dec_32)
     62 STRONG_ALIAS(_atomic_dec_ptr,_atomic_dec_32)
     63 #endif
     64 
     65 ENTRY_NP(_atomic_dec_32_nv)
     66 	li		a1, 1
     67 ENTRY_NP(_atomic_sub_32_nv)
     68 	INT_SUB		t1, zero, a1
     69 	amoadd.w.aq	t0, t1, 0(a0)	/* update memory and get old value */
     70 	INT_ADD		a0, t0, t1	/* turn into new value */
     71 	ret
     72 END(_atomic_sub_32_nv)
     73 END(_atomic_dec_32_nv)
     74 
     75 ATOMIC_OP_ALIAS(atomic_sub_32_nv,_atomic_sub_32_nv)
     76 ATOMIC_OP_ALIAS(atomic_sub_int_nv,_atomic_sub_32_nv)
     77 STRONG_ALIAS(_atomic_sub_int_nv,_atomic_sub_32_nv)
     78 #ifndef _LP64
     79 ATOMIC_OP_ALIAS(atomic_sub_long_nv,_atomic_sub_32_nv)
     80 STRONG_ALIAS(_atomic_sub_long_nv,_atomic_sub_32_nv)
     81 ATOMIC_OP_ALIAS(atomic_sub_ptr_nv,_atomic_sub_32_nv)
     82 STRONG_ALIAS(_atomic_sub_ptr_nv,_atomic_sub_32_nv)
     83 #endif
     84 CRT_ALIAS(__sync_sub_and_fetch_4,_atomic_sub_32_nv)
     85 CRT_ALIAS(__atomic_sub_fetch_4,_atomic_sub_32_nv)
     86 
     87 ATOMIC_OP_ALIAS(atomic_dec_32_nv,_atomic_dec_32_nv)
     88 ATOMIC_OP_ALIAS(atomic_dec_uint_nv,_atomic_dec_32_nv)
     89 STRONG_ALIAS(_atomic_dec_uint_nv,_atomic_dec_32_nv)
     90 #ifndef _LP64
     91 ATOMIC_OP_ALIAS(atomic_dec_ulong_nv,_atomic_dec_32_nv)
     92 STRONG_ALIAS(_atomic_dec_ulong_nv,_atomic_dec_32_nv)
     93 ATOMIC_OP_ALIAS(atomic_dec_ptr_nv,_atomic_dec_32_nv)
     94 STRONG_ALIAS(_atomic_dec_ptr_nv,_atomic_dec_32_nv)
     95 #endif
     96