1/* $NetBSD: atomic_nand_8.S,v 1.5 2021/07/28 07:32:20 skrll Exp $ */ 2 3/*- 4 * Copyright (c) 2013 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 <matt@3am-software.com> 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#if defined(_ARM_ARCH_6) 35 36ENTRY_NP(_atomic_nand_8) 37 mov ip, r0 381: ldrexb r0, [ip] /* load old value (to be returned) */ 39 ands r3, r0, r1 /* calculate new value step 1 */ 40 mvns r3, r3 /* ... complement for new value */ 41 strexb r2, r3, [ip] /* try to store */ 42 cmp r2, #0 /* succeed? */ 43 bne 1b /* no, try again */ 44 RET /* return old value */ 45END(_atomic_nand_8) 46 47ATOMIC_OP_ALIAS(atomic_nand_8,_atomic_nand_8) 48ATOMIC_OP_ALIAS(atomic_nand_uchar,_atomic_nand_8) 49STRONG_ALIAS(_atomic_nand_uchar,_atomic_nand_8) 50 51ENTRY_NP(__sync_fetch_and_nand_1) 52 push {r4, lr} 53 DMB 54 bl _atomic_nand_8 55 DMB 56 pop {r4, pc} 57END(__sync_fetch_and_nand_1) 58 59 60ENTRY_NP(_atomic_nand_8_nv) 61 mov ip, r0 /* need r0 for return value */ 621: ldrexb r0, [ip] /* load old value */ 63 ands r0, r0, r1 /* calculate new value step 1*/ 64 mvns r0, r0 /* ... complement for new value */ 65 strexb r2, r0, [ip] /* try to store */ 66 cmp r2, #0 /* succeed? */ 67 bne 1b /* no, try again? */ 68 RET /* return new value */ 69END(_atomic_nand_8_nv) 70 71ATOMIC_OP_ALIAS(atomic_nand_8_nv,_atomic_nand_8_nv) 72ATOMIC_OP_ALIAS(atomic_nand_uchar_nv,_atomic_nand_8_nv) 73STRONG_ALIAS(_atomic_nand_uchar_nv,_atomic_nand_8_nv) 74 75ENTRY_NP(__sync_nand_and_fetch_1) 76 push {r4, lr} 77 DMB 78 bl _atomic_nand_8_nv 79 DMB 80 pop {r4, pc} 81END(__sync_nand_and_fetch_1) 82 83 84#endif /* _ARM_ARCH_6 */ 85