5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
33 lines
596 B
ArmAsm
33 lines
596 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/lib/strchr.S
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*
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* Copyright (C) 1995-2000 Russell King
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* Copyright (C) 2013 ARM Ltd.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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/*
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* Find the first occurrence of a character in a string.
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*
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* Parameters:
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* x0 - str
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* x1 - c
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* Returns:
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* x0 - address of first occurrence of 'c' or 0
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*/
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SYM_FUNC_START_WEAK(strchr)
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and w1, w1, #0xff
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1: ldrb w2, [x0], #1
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cmp w2, w1
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ccmp w2, wzr, #4, ne
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b.ne 1b
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sub x0, x0, #1
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cmp w2, w1
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csel x0, x0, xzr, eq
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ret
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SYM_FUNC_END(strchr)
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EXPORT_SYMBOL_NOKASAN(strchr)
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