1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Based on arch/arm/lib/strrchr.S 4 * 5 * Copyright (C) 1995-2000 Russell King 6 * Copyright (C) 2013 ARM Ltd. 7 */ 8 9 #include <linux/linkage.h> 10 #include <asm/assembler.h> 11 12 /* 13 * Find the last occurrence of a character in a string. 14 * 15 * Parameters: 16 * x0 - str 17 * x1 - c 18 * Returns: 19 * x0 - address of last occurrence of 'c' or 0 20 */ 21 SYM_FUNC_START_WEAK_PI(strrchr) 22 mov x3, #0 23 and w1, w1, #0xff 24 1: ldrb w2, [x0], #1 25 cbz w2, 2f 26 cmp w2, w1 27 b.ne 1b 28 sub x3, x0, #1 29 b 1b 30 2: mov x0, x3 31 ret 32 SYM_FUNC_END_PI(strrchr) 33 EXPORT_SYMBOL_NOKASAN(strrchr) 34