35 строки
634 B
ArmAsm
35 строки
634 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/lib/strrchr.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 last 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 last occurrence of 'c' or 0
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*/
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SYM_FUNC_START(__pi_strrchr)
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mov x3, #0
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and w1, w1, #0xff
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1: ldrb w2, [x0], #1
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cbz w2, 2f
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cmp w2, w1
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b.ne 1b
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sub x3, x0, #1
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b 1b
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2: mov x0, x3
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ret
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SYM_FUNC_END(__pi_strrchr)
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SYM_FUNC_ALIAS_WEAK(strrchr, __pi_strrchr)
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EXPORT_SYMBOL_NOKASAN(strrchr)
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