1/* $NetBSD: atomic_cas_up.S,v 1.2 2014/01/29 13:06:36 martin Exp $ */ 2 3/*- 4 * Copyright (c) 2012 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 <sys/ras.h> 30#include "atomic_op_asm.h" 31 32 .text 33 34ENTRY(_atomic_cas_up) 35 .hidden _C_LABEL(_atomic_cas_up) 36RAS_START_ASM_HIDDEN(_atomic_cas) 37 ld [%o0], %o3 ! get old value 38 cmp %o1, %o3 ! old == new? 39 beq,a 1f ! yes, do the store 40 st %o2, [%o0] ! (in the delay slot) 41RAS_END_ASM_HIDDEN(_atomic_cas) 421: 43 retl 44 mov %o3, %o0 ! return old value 45 46ENTRY(_atomic_cas_16_up) 47 .hidden _C_LABEL(_atomic_cas_16_up) 48RAS_START_ASM_HIDDEN(_atomic_cas_16) 49 lduh [%o0], %o3 ! get old value 50 cmp %o1, %o3 ! old == new? 51 beq,a 1f ! yes, do the store 52 sth %o2, [%o0] ! (in the delay slot) 53RAS_END_ASM_HIDDEN(_atomic_cas_16) 541: 55 retl 56 mov %o3, %o0 ! return old value 57 58ENTRY(_atomic_cas_8_up) 59 .hidden _C_LABEL(_atomic_cas_8_up) 60RAS_START_ASM_HIDDEN(_atomic_cas_8) 61 ldub [%o0], %o3 ! get old value 62 cmp %o1, %o3 ! old == new? 63 beq,a 1f ! yes, do the store 64 stb %o2, [%o0] ! (in the delay slot) 65RAS_END_ASM_HIDDEN(_atomic_cas_8) 661: 67 retl 68 mov %o3, %o0 ! return old value 69 70