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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/avr32/lib/clear_user.S
10817 views
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/*

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 * Copyright 2004-2006 Atmel Corporation

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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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#include <asm/page.h>

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#include <asm/thread_info.h>

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#include <asm/asm.h>

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	.text

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	.align	1

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	.global	clear_user

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	.type	clear_user, "function"

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clear_user:

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	branch_if_kernel r8, __clear_user

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	ret_if_privileged r8, r12, r11, r11

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	.global	__clear_user

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	.type	__clear_user, "function"

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__clear_user:

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	mov	r9, r12

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	mov	r8, 0

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	andl	r9, 3, COH

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	brne	5f

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1:	sub	r11, 4

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	brlt	2f

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10:	st.w	r12++, r8

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	sub	r11, 4

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	brge	10b

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2:	sub	r11, -4

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	reteq	0

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	/* Unaligned count or address */

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	bld	r11, 1

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	brcc	12f

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11:	st.h	r12++, r8

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	sub	r11, 2

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	reteq	0

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12:	st.b	r12++, r8

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	retal	0

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	/* Unaligned address */

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5:	cp.w	r11, 4

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	brlt	2b

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	lsl	r9, 2

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	add	pc, pc, r9

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13:	st.b	r12++, r8

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	sub	r11, 1

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14:	st.b	r12++, r8

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	sub	r11, 1

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15:	st.b	r12++, r8

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	sub	r11, 1

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	rjmp	1b

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	.size	clear_user, . - clear_user

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	.size	__clear_user, . - __clear_user

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	.section .fixup, "ax"

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	.align	1

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18:	sub	r11, -4

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19:	retal	r11

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	.section __ex_table, "a"

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	.align	2

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	.long	10b, 18b

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	.long	11b, 19b

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	.long	12b, 19b

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	.long	13b, 19b

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	.long	14b, 19b

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	.long	15b, 19b

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