1*4882a593Smuzhiyun/* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun/* 3*4882a593Smuzhiyun * Based on arch/arm/lib/memchr.S 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 1995-2000 Russell King 6*4882a593Smuzhiyun * Copyright (C) 2013 ARM Ltd. 7*4882a593Smuzhiyun */ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun#include <linux/linkage.h> 10*4882a593Smuzhiyun#include <asm/assembler.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun/* 13*4882a593Smuzhiyun * Find a character in an area of memory. 14*4882a593Smuzhiyun * 15*4882a593Smuzhiyun * Parameters: 16*4882a593Smuzhiyun * x0 - buf 17*4882a593Smuzhiyun * x1 - c 18*4882a593Smuzhiyun * x2 - n 19*4882a593Smuzhiyun * Returns: 20*4882a593Smuzhiyun * x0 - address of first occurrence of 'c' or 0 21*4882a593Smuzhiyun */ 22*4882a593SmuzhiyunSYM_FUNC_START_WEAK_PI(memchr) 23*4882a593Smuzhiyun and w1, w1, #0xff 24*4882a593Smuzhiyun1: subs x2, x2, #1 25*4882a593Smuzhiyun b.mi 2f 26*4882a593Smuzhiyun ldrb w3, [x0], #1 27*4882a593Smuzhiyun cmp w3, w1 28*4882a593Smuzhiyun b.ne 1b 29*4882a593Smuzhiyun sub x0, x0, #1 30*4882a593Smuzhiyun ret 31*4882a593Smuzhiyun2: mov x0, #0 32*4882a593Smuzhiyun ret 33*4882a593SmuzhiyunSYM_FUNC_END_PI(memchr) 34*4882a593SmuzhiyunEXPORT_SYMBOL_NOKASAN(memchr) 35