11.5Sskrll/* $NetBSD: atomic_nand_8.S,v 1.5 2021/07/28 07:32:20 skrll Exp $ */ 21.1Smatt 31.1Smatt/*- 41.1Smatt * Copyright (c) 2013 The NetBSD Foundation, Inc. 51.1Smatt * All rights reserved. 61.1Smatt * 71.1Smatt * This code is derived from software contributed to The NetBSD Foundation 81.1Smatt * by Matt Thomas <matt@3am-software.com> 91.1Smatt * 101.1Smatt * Redistribution and use in source and binary forms, with or without 111.1Smatt * modification, are permitted provided that the following conditions 121.1Smatt * are met: 131.1Smatt * 1. Redistributions of source code must retain the above copyright 141.1Smatt * notice, this list of conditions and the following disclaimer. 151.1Smatt * 2. Redistributions in binary form must reproduce the above copyright 161.1Smatt * notice, this list of conditions and the following disclaimer in the 171.1Smatt * documentation and/or other materials provided with the distribution. 181.1Smatt * 191.1Smatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.1Smatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.1Smatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.1Smatt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.1Smatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.1Smatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.1Smatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.1Smatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.1Smatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.1Smatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.1Smatt * POSSIBILITY OF SUCH DAMAGE. 301.1Smatt */ 311.1Smatt 321.1Smatt#include "atomic_op_asm.h" 331.1Smatt 341.4Sskrll#if defined(_ARM_ARCH_6) 351.1Smatt 361.1SmattENTRY_NP(_atomic_nand_8) 371.1Smatt mov ip, r0 381.1Smatt1: ldrexb r0, [ip] /* load old value (to be returned) */ 391.3Sskrll ands r3, r0, r1 /* calculate new value step 1 */ 401.3Sskrll mvns r3, r3 /* ... complement for new value */ 411.1Smatt strexb r2, r3, [ip] /* try to store */ 421.1Smatt cmp r2, #0 /* succeed? */ 431.1Smatt bne 1b /* no, try again */ 441.1Smatt RET /* return old value */ 451.1SmattEND(_atomic_nand_8) 461.1Smatt 471.1SmattATOMIC_OP_ALIAS(atomic_nand_8,_atomic_nand_8) 481.1SmattATOMIC_OP_ALIAS(atomic_nand_uchar,_atomic_nand_8) 491.1SmattSTRONG_ALIAS(_atomic_nand_uchar,_atomic_nand_8) 501.1Smatt 511.5SskrllENTRY_NP(__sync_fetch_and_nand_1) 521.5Sskrll push {r4, lr} 531.5Sskrll DMB 541.5Sskrll bl _atomic_nand_8 551.5Sskrll DMB 561.5Sskrll pop {r4, pc} 571.5SskrllEND(__sync_fetch_and_nand_1) 581.5Sskrll 591.5Sskrll 601.1SmattENTRY_NP(_atomic_nand_8_nv) 611.1Smatt mov ip, r0 /* need r0 for return value */ 621.1Smatt1: ldrexb r0, [ip] /* load old value */ 631.3Sskrll ands r0, r0, r1 /* calculate new value step 1*/ 641.3Sskrll mvns r0, r0 /* ... complement for new value */ 651.1Smatt strexb r2, r0, [ip] /* try to store */ 661.1Smatt cmp r2, #0 /* succeed? */ 671.1Smatt bne 1b /* no, try again? */ 681.1Smatt RET /* return new value */ 691.1SmattEND(_atomic_nand_8_nv) 701.1Smatt 711.1SmattATOMIC_OP_ALIAS(atomic_nand_8_nv,_atomic_nand_8_nv) 721.1SmattATOMIC_OP_ALIAS(atomic_nand_uchar_nv,_atomic_nand_8_nv) 731.1SmattSTRONG_ALIAS(_atomic_nand_uchar_nv,_atomic_nand_8_nv) 741.1Smatt 751.5SskrllENTRY_NP(__sync_nand_and_fetch_1) 761.5Sskrll push {r4, lr} 771.5Sskrll DMB 781.5Sskrll bl _atomic_nand_8_nv 791.5Sskrll DMB 801.5Sskrll pop {r4, pc} 811.5SskrllEND(__sync_nand_and_fetch_1) 821.5Sskrll 831.5Sskrll 841.1Smatt#endif /* _ARM_ARCH_6 */ 85