1/* 2 * Based on arch/arm/lib/strchr.S 3 * 4 * Copyright (C) 1995-2000 Russell King 5 * Copyright (C) 2013 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20#include <linux/linkage.h> 21#include <asm/assembler.h> 22 23/* 24 * Find the first occurrence of a character in a string. 25 * 26 * Parameters: 27 * x0 - str 28 * x1 - c 29 * Returns: 30 * x0 - address of first occurrence of 'c' or 0 31 */ 32ENTRY(strchr) 33 and w1, w1, #0xff 341: ldrb w2, [x0], #1 35 cmp w2, w1 36 ccmp w2, wzr, #4, ne 37 b.ne 1b 38 sub x0, x0, #1 39 cmp w2, w1 40 csel x0, x0, xzr, eq 41 ret 42ENDPROC(strchr) 43