/*
   * Based on arch/arm/lib/memchr.S
   *
   * Copyright (C) 1995-2000 Russell King
   * Copyright (C) 2013 ARM Ltd.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include <linux/linkage.h>
  #include <asm/assembler.h>
  
  /*
   * Find a character in an area of memory.
   *
   * Parameters:
   *	x0 - buf
   *	x1 - c
   *	x2 - n
   * Returns:
   *	x0 - address of first occurrence of 'c' or 0
   */
  ENTRY(memchr)
  	and	w1, w1, #0xff
  1:	subs	x2, x2, #1
  	b.mi	2f
  	ldrb	w3, [x0], #1
  	cmp	w3, w1
  	b.ne	1b
  	sub	x0, x0, #1
  	ret
  2:	mov	x0, #0
  	ret
  ENDPIPROC(memchr)