cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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strrchr.S (634B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Based on arch/arm/lib/strrchr.S
      4 *
      5 * Copyright (C) 1995-2000 Russell King
      6 * Copyright (C) 2013 ARM Ltd.
      7 */
      8
      9#include <linux/linkage.h>
     10#include <asm/assembler.h>
     11
     12/*
     13 * Find the last occurrence of a character in a string.
     14 *
     15 * Parameters:
     16 *	x0 - str
     17 *	x1 - c
     18 * Returns:
     19 *	x0 - address of last occurrence of 'c' or 0
     20 */
     21SYM_FUNC_START(__pi_strrchr)
     22	mov	x3, #0
     23	and	w1, w1, #0xff
     241:	ldrb	w2, [x0], #1
     25	cbz	w2, 2f
     26	cmp	w2, w1
     27	b.ne	1b
     28	sub	x3, x0, #1
     29	b	1b
     302:	mov	x0, x3
     31	ret
     32SYM_FUNC_END(__pi_strrchr)
     33SYM_FUNC_ALIAS_WEAK(strrchr, __pi_strrchr)
     34EXPORT_SYMBOL_NOKASAN(strrchr)