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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/avr32/lib/memset.S
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/*

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 * Copyright (C) 2004-2006 Atmel Corporation

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 *

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 * Based on linux/arch/arm/lib/memset.S

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 *   Copyright (C) 1995-2000 Russell King

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 *

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 * This program is free software; you can redistribute it and/or modify

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 * it under the terms of the GNU General Public License version 2 as

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 * published by the Free Software Foundation.

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 *

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 * ASM optimised string functions

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 */

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#include <asm/asm.h>

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	/*

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	 * r12:	void *b

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	 * r11:	int c

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	 * r10:	size_t len

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	 *

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	 * Returns b in r12

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	 */

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	.text

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	.global	memset

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	.type	memset, @function

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	.align	5

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memset:

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	mov	r9, r12

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	mov	r8, r12

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	or	r11, r11, r11 << 8

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	andl	r9, 3, COH

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	brne	1f

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2:	or	r11, r11, r11 << 16

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	sub	r10, 4

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	brlt	5f

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	/* Let's do some real work */

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4:	st.w	r8++, r11

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	sub	r10, 4

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	brge	4b

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	/*

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	 * When we get here, we've got less than 4 bytes to set. r10

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	 * might be negative.

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	 */

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5:	sub	r10, -4

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	reteq	r12

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	/* Fastpath ends here, exactly 32 bytes from memset */

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	/* Handle unaligned count or pointer */

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	bld	r10, 1

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	brcc	6f

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	st.b	r8++, r11

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	st.b	r8++, r11

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	bld	r10, 0

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	retcc	r12

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6:	st.b	r8++, r11

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	retal	r12

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	/* Handle unaligned pointer */

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1:	sub	r10, 4

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	brlt	5b

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	add	r10, r9

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	lsl	r9, 1

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	add	pc, r9

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	st.b	r8++, r11

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	st.b	r8++, r11

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	st.b	r8++, r11

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	rjmp	2b

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	.size	memset, . - memset

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