18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-only */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Based on arch/arm/lib/strchr.S 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Copyright (C) 1995-2000 Russell King 68c2ecf20Sopenharmony_ci * Copyright (C) 2013 ARM Ltd. 78c2ecf20Sopenharmony_ci */ 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci#include <linux/linkage.h> 108c2ecf20Sopenharmony_ci#include <asm/assembler.h> 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ci/* 138c2ecf20Sopenharmony_ci * Find the first occurrence of a character in a string. 148c2ecf20Sopenharmony_ci * 158c2ecf20Sopenharmony_ci * Parameters: 168c2ecf20Sopenharmony_ci * x0 - str 178c2ecf20Sopenharmony_ci * x1 - c 188c2ecf20Sopenharmony_ci * Returns: 198c2ecf20Sopenharmony_ci * x0 - address of first occurrence of 'c' or 0 208c2ecf20Sopenharmony_ci */ 218c2ecf20Sopenharmony_ciSYM_FUNC_START_WEAK(strchr) 228c2ecf20Sopenharmony_ci and w1, w1, #0xff 238c2ecf20Sopenharmony_ci1: ldrb w2, [x0], #1 248c2ecf20Sopenharmony_ci cmp w2, w1 258c2ecf20Sopenharmony_ci ccmp w2, wzr, #4, ne 268c2ecf20Sopenharmony_ci b.ne 1b 278c2ecf20Sopenharmony_ci sub x0, x0, #1 288c2ecf20Sopenharmony_ci cmp w2, w1 298c2ecf20Sopenharmony_ci csel x0, x0, xzr, eq 308c2ecf20Sopenharmony_ci ret 318c2ecf20Sopenharmony_ciSYM_FUNC_END(strchr) 328c2ecf20Sopenharmony_ciEXPORT_SYMBOL_NOKASAN(strchr) 33