| Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/arch/arm/lib/memchr.S |
| 4 | * |
| 5 | * Copyright (C) 1995-2000 Russell King |
| 6 | * |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * ASM optimised string functions |
| 8 | */ |
| 9 | #include <linux/linkage.h> |
| 10 | #include <asm/assembler.h> |
| 11 | |
| 12 | .text |
| 13 | .align 5 |
| 14 | ENTRY(memchr) |
| 15 | 1: subs r2, r2, #1 |
| 16 | bmi 2f |
| 17 | ldrb r3, [r0], #1 |
| 18 | teq r3, r1 |
| 19 | bne 1b |
| 20 | sub r0, r0, #1 |
| 21 | 2: movne r0, #0 |
| Russell King | 6ebbf2c | 2014-06-30 16:29:12 +0100 | [diff] [blame] | 22 | ret lr |
| Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 23 | ENDPROC(memchr) |