| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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) |