1*1bb92983SJerome Forissier/* SPDX-License-Identifier: BSD-2-Clause */ 2e17dd72aSJens Wiklander/* 3e17dd72aSJens Wiklander * Copyright (c) 2015-2016, Linaro Limited 4e17dd72aSJens Wiklander * All rights reserved. 5e17dd72aSJens Wiklander * 6e17dd72aSJens Wiklander * Redistribution and use in source and binary forms, with or without 7e17dd72aSJens Wiklander * modification, are permitted provided that the following conditions are met: 8e17dd72aSJens Wiklander * 9e17dd72aSJens Wiklander * 1. Redistributions of source code must retain the above copyright notice, 10e17dd72aSJens Wiklander * this list of conditions and the following disclaimer. 11e17dd72aSJens Wiklander * 12e17dd72aSJens Wiklander * 2. Redistributions in binary form must reproduce the above copyright notice, 13e17dd72aSJens Wiklander * this list of conditions and the following disclaimer in the documentation 14e17dd72aSJens Wiklander * and/or other materials provided with the distribution. 15e17dd72aSJens Wiklander * 16e17dd72aSJens Wiklander * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17e17dd72aSJens Wiklander * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18e17dd72aSJens Wiklander * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19e17dd72aSJens Wiklander * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20e17dd72aSJens Wiklander * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21e17dd72aSJens Wiklander * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22e17dd72aSJens Wiklander * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23e17dd72aSJens Wiklander * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24e17dd72aSJens Wiklander * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25e17dd72aSJens Wiklander * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26e17dd72aSJens Wiklander * POSSIBILITY OF SUCH DAMAGE. 27e17dd72aSJens Wiklander */ 28e17dd72aSJens Wiklander 29e17dd72aSJens Wiklander#include <asm.S> 30e17dd72aSJens Wiklander 31e17dd72aSJens Wiklander/* uint32_t atomic_inc32(uint32_t *v); */ 32e17dd72aSJens WiklanderFUNC atomic_inc32 , : 33e17dd72aSJens Wiklander ldrex r1, [r0] 34e17dd72aSJens Wiklander add r1, r1, #1 35e17dd72aSJens Wiklander strex r2, r1, [r0] 36e17dd72aSJens Wiklander cmp r2, #0 37e17dd72aSJens Wiklander bne atomic_inc32 38e17dd72aSJens Wiklander mov r0, r1 39e17dd72aSJens Wiklander bx lr 40e17dd72aSJens WiklanderEND_FUNC atomic_inc32 41e17dd72aSJens Wiklander 42e17dd72aSJens Wiklander/* uint32_t atomic_dec32(uint32_t *v); */ 43e17dd72aSJens WiklanderFUNC atomic_dec32 , : 44e17dd72aSJens Wiklander ldrex r1, [r0] 45e17dd72aSJens Wiklander sub r1, r1, #1 46e17dd72aSJens Wiklander strex r2, r1, [r0] 47e17dd72aSJens Wiklander cmp r2, #0 48e17dd72aSJens Wiklander bne atomic_dec32 49e17dd72aSJens Wiklander mov r0, r1 50e17dd72aSJens Wiklander bx lr 51e17dd72aSJens WiklanderEND_FUNC atomic_dec32 52