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Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/lib/memchr.S | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/arm64/lib/memchr.S b/arch/arm64/lib/memchr.S new file mode 100644 index 000000000..edf6b970a --- /dev/null +++ b/arch/arm64/lib/memchr.S @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Based on arch/arm/lib/memchr.S + * + * Copyright (C) 1995-2000 Russell King + * Copyright (C) 2013 ARM Ltd. + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> + +/* + * Find a character in an area of memory. + * + * Parameters: + * x0 - buf + * x1 - c + * x2 - n + * Returns: + * x0 - address of first occurrence of 'c' or 0 + */ +SYM_FUNC_START_WEAK_PI(memchr) + and w1, w1, #0xff +1: subs x2, x2, #1 + b.mi 2f + ldrb w3, [x0], #1 + cmp w3, w1 + b.ne 1b + sub x0, x0, #1 + ret +2: mov x0, #0 + ret +SYM_FUNC_END_PI(memchr) +EXPORT_SYMBOL_NOKASAN(memchr) |