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kernel/linux-imx6_3.14.28/arch/avr32/lib/memset.S 1.2 KB
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  /*
   * Copyright (C) 2004-2006 Atmel Corporation
   *
   * Based on linux/arch/arm/lib/memset.S
   *   Copyright (C) 1995-2000 Russell King
   *
   * 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.
   *
   * ASM optimised string functions
   */
  #include <asm/asm.h>
  
  	/*
  	 * r12:	void *b
  	 * r11:	int c
  	 * r10:	size_t len
  	 *
  	 * Returns b in r12
  	 */
  	.text
  	.global	memset
  	.type	memset, @function
  	.align	5
  memset:
  	mov	r9, r12
  	mov	r8, r12
  	or	r11, r11, r11 << 8
  	andl	r9, 3, COH
  	brne	1f
  
  2:	or	r11, r11, r11 << 16
  	sub	r10, 4
  	brlt	5f
  
  	/* Let's do some real work */
  4:	st.w	r8++, r11
  	sub	r10, 4
  	brge	4b
  
  	/*
  	 * When we get here, we've got less than 4 bytes to set. r10
  	 * might be negative.
  	 */
  5:	sub	r10, -4
  	reteq	r12
  
  	/* Fastpath ends here, exactly 32 bytes from memset */
  
  	/* Handle unaligned count or pointer */
  	bld	r10, 1
  	brcc	6f
  	st.b	r8++, r11
  	st.b	r8++, r11
  	bld	r10, 0
  	retcc	r12
  6:	st.b	r8++, r11
  	retal	r12
  
  	/* Handle unaligned pointer */
  1:	sub	r10, 4
  	brlt	5b
  	add	r10, r9
  	lsl	r9, 1
  	add	pc, r9
  	st.b	r8++, r11
  	st.b	r8++, r11
  	st.b	r8++, r11
  	rjmp	2b
  
  	.size	memset, . - memset