/* $NetBSD: atomic_nand_8.S,v 1.5 2021/07/29 10:29:05 skrll Exp $ */ /*- * Copyright (c) 2014 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matt Thomas of 3am Software Foundry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "atomic_op_asm.h" /* * { tmp = *ptr; *ptr = ~(tmp & value); return tmp; } // nand */ ENTRY_NP(_atomic_nand_8) mov x4, x0 /* need r0 for return value */ 1: ldxrb w0, [x4] /* load old value (*ptr) */ and w3, w0, w1 /* w3 = (*ptr & value) */ mvn w3, w3 /* w3 = ~(*ptr & value) */ stxrb w2, w3, [x4] /* try to store */ cbnz w2, 2f /* succeed? no, try again */ ret /* return old value */ 2: b 1b END(_atomic_nand_8) ATOMIC_OP_ALIAS(atomic_nand_8,_atomic_nand_8) ATOMIC_OP_ALIAS(atomic_nand_uchar,_atomic_nand_8) STRONG_ALIAS(_atomic_nand_uchar,_atomic_nand_8) ENTRY_NP(__sync_fetch_and_nand_1) mov x4, x0 /* need r0 for return value */ dmb ish 1: ldxrb w0, [x4] /* load old value (*ptr) */ and w3, w0, w1 /* w3 = (*ptr & value) */ mvn w3, w3 /* w3 = ~(*ptr & value) */ stxrb w2, w3, [x4] /* try to store */ cbnz w2, 2f /* succeed? no, try again */ dmb ish ret /* return old value */ 2: b 1b END(__sync_fetch_and_nand_1) /* * { tmp = ~(*ptr & value); *ptr = tmp; return *ptr; } // nand */ ENTRY_NP(_atomic_nand_8_nv) mov x4, x0 /* need r0 for return value */ 1: ldxrb w0, [x4] /* load old value (*ptr) */ and w0, w0, w1 /* w0 = (*ptr & value) */ mvn w0, w0 /* w0 = ~(*ptr & value), return value */ stxrb w2, w0, [x4] /* try to store */ cbnz w2, 2f /* succeed? no, try again? */ ret /* return new value */ 2: b 1b END(_atomic_nand_8_nv) ATOMIC_OP_ALIAS(atomic_nand_8_nv,_atomic_nand_8_nv) ATOMIC_OP_ALIAS(atomic_nand_uchar_nv,_atomic_nand_8_nv) STRONG_ALIAS(_atomic_nand_uchar_nv,_atomic_nand_8_nv) ENTRY_NP(__sync_nand_and_fetch_1) mov x4, x0 /* need r0 for return value */ dmb ish 1: ldxrb w0, [x4] /* load old value (*ptr) */ and w0, w0, w1 /* w0 = (*ptr & value) */ mvn w0, w0 /* w0 = ~(*ptr & value) */ stxrb w2, w0, [x4] /* try to store */ cbnz w2, 2f /* succeed? no, try again? */ dmb ish ret /* return new value */ 2: b 1b END(__sync_nand_and_fetch_1) |