/* SPDX-License-Identifier: GPL-2.0-only */

/*
 * Copyright (C) 2025 Feng Jiang <jiangfeng@kylinos.cn>
 */

#include <linux/linkage.h>
#include <asm/asm.h>

/* char *strrchr(const char *s, int c) */
SYM_FUNC_START(strrchr)
        /*
         * Parameters
         *      a0 - The string to be searched
         *      a1 - The character to seaerch for
         *
         * Returns
         *      a0 - Address of last occurrence of 'c' or 0
         *
         * Clobbers
         *      t0, t1
         */
        andi    a1, a1, 0xff
        mv      t1, a0
        li      a0, 0
1:
        lbu     t0, 0(t1)
        bne     t0, a1, 2f
        mv      a0, t1
2:
        addi    t1, t1, 1
        bnez    t0, 1b
        ret
SYM_FUNC_END(strrchr)

SYM_FUNC_ALIAS_WEAK(__pi_strrchr, strrchr)
EXPORT_SYMBOL(strrchr)