| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * Based on arch/arm/lib/strchr.S |
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| 4 | * |
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| 5 | * Copyright (C) 1995-2000 Russell King |
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| 6 | * Copyright (C) 2013 ARM Ltd. |
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| 7 | */ |
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| 8 | |
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| 9 | #include <linux/linkage.h> |
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| 10 | #include <asm/assembler.h> |
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| 11 | |
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| 12 | /* |
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| 13 | * Find the first occurrence of a character in a string. |
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| 14 | * |
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| 15 | * Parameters: |
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| 16 | * x0 - str |
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| 17 | * x1 - c |
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| 18 | * Returns: |
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| 19 | * x0 - address of first occurrence of 'c' or 0 |
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| 20 | */ |
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| 21 | SYM_FUNC_START(__pi_strchr) |
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| 22 | and w1, w1, #0xff |
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| 23 | 1: ldrb w2, [x0], #1 |
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| 24 | cmp w2, w1 |
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| 25 | ccmp w2, wzr, #4, ne |
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| 26 | b.ne 1b |
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| 27 | sub x0, x0, #1 |
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| 28 | cmp w2, w1 |
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| 29 | csel x0, x0, xzr, eq |
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| 30 | ret |
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| 31 | SYM_FUNC_END(__pi_strchr) |
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| 32 | |
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| 33 | SYM_FUNC_ALIAS_WEAK(strchr, __pi_strchr) |
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| 34 | EXPORT_SYMBOL_NOKASAN(strchr) |
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| 35 | |
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