1/* 2 * Based on arch/arm/lib/memchr.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 a character in an area of memory. 25 * 26 * Parameters: 27 * x0 - buf 28 * x1 - c 29 * x2 - n 30 * Returns: 31 * x0 - address of first occurrence of 'c' or 0 32 */ 33ENTRY(memchr) 34 and w1, w1, #0xff 351: subs x2, x2, #1 36 b.mi 2f 37 ldrb w3, [x0], #1 38 cmp w3, w1 39 b.ne 1b 40 sub x0, x0, #1 41 ret 422: mov x0, #0 43 ret 44ENDPROC(memchr) 45