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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strchr.S (643B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Based on arch/arm/lib/strchr.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 first occurrence of a character in a string.
     14 *
     15 * Parameters:
     16 *	x0 - str
     17 *	x1 - c
     18 * Returns:
     19 *	x0 - address of first occurrence of 'c' or 0
     20 */
     21SYM_FUNC_START(__pi_strchr)
     22	and	w1, w1, #0xff
     231:	ldrb	w2, [x0], #1
     24	cmp	w2, w1
     25	ccmp	w2, wzr, #4, ne
     26	b.ne	1b
     27	sub	x0, x0, #1
     28	cmp	w2, w1
     29	csel	x0, x0, xzr, eq
     30	ret
     31SYM_FUNC_END(__pi_strchr)
     32
     33SYM_FUNC_ALIAS_WEAK(strchr, __pi_strchr)
     34EXPORT_SYMBOL_NOKASAN(strchr)