/* 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(__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)
SYM_FUNC_ALIAS_WEAK(strrchr, __pi_strrchr)
EXPORT_SYMBOL_NOKASAN(strrchr)