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Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/lib/strrchr.S | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm64/lib/strrchr.S b/arch/arm64/lib/strrchr.S new file mode 100644 index 000000000..13132d1ed --- /dev/null +++ b/arch/arm64/lib/strrchr.S @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Based on arch/arm/lib/strrchr.S + * + * Copyright (C) 1995-2000 Russell King + * Copyright (C) 2013 ARM Ltd. + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> + +/* + * Find the last occurrence of a character in a string. + * + * Parameters: + * x0 - str + * x1 - c + * Returns: + * x0 - address of last occurrence of 'c' or 0 + */ +SYM_FUNC_START_WEAK_PI(strrchr) + mov x3, #0 + and w1, w1, #0xff +1: ldrb w2, [x0], #1 + cbz w2, 2f + cmp w2, w1 + b.ne 1b + sub x3, x0, #1 + b 1b +2: mov x0, x3 + ret +SYM_FUNC_END_PI(strrchr) +EXPORT_SYMBOL_NOKASAN(strrchr) |