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

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 * Copyright (C) 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/errno.h>

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#include <asm/asm.h>

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	/*

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	 * unsigned int csum_partial_copy_generic(const char *src, char *dst, int len

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	 *					  int sum, int *src_err_ptr,

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	 *					  int *dst_err_ptr)

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	 *

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	 * Copy src to dst while checksumming, otherwise like csum_partial.

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	 */

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	.macro ld_src size, reg, ptr

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9999:	ld.\size \reg, \ptr

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	.section __ex_table, "a"

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	.long	9999b, fixup_ld_src

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	.previous

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	.endm

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	.macro st_dst size, ptr, reg

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9999:	st.\size \ptr, \reg

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	.section __ex_table, "a"

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	.long	9999b, fixup_st_dst

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	.previous

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	.endm

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	.text

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	.global	csum_partial_copy_generic

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	.type	csum_partial_copy_generic,"function"

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	.align	1

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csum_partial_copy_generic:

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	pushm	r4-r7,lr

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	/* The inner loop */

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1:	sub	r10, 4

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	brlt	5f

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2:	ld_src	w, r5, r12++

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	st_dst	w, r11++, r5

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	add	r9, r5

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	acr	r9

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	sub	r10, 4

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	brge	2b

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	/* return if we had a whole number of words */

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5:	sub	r10, -4

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	brne	7f

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6:	mov	r12, r9

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	popm	r4-r7,pc

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	/* handle additional bytes at the tail */

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7:	mov	r5, 0

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	mov	r4, 32

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8:	ld_src	ub, r6, r12++

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	st_dst	b, r11++, r6

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	lsl	r5, 8

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	sub	r4, 8

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	bfins	r5, r6, 0, 8

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	sub	r10, 1

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	brne	8b

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	lsl	r5, r5, r4

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	add	r9, r5

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	acr	r9

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	rjmp	6b

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	/* Exception handler */

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	.section .fixup,"ax"

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	.align	1

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fixup_ld_src:

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	mov	r9, -EFAULT

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	cp.w	r8, 0

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	breq	1f

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	st.w	r8[0], r9

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1:	/*

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	 * TODO: zero the complete destination - computing the rest

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	 * is too much work

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	 */

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	mov	r9, 0

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	rjmp	6b

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fixup_st_dst:

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	mov	r9, -EFAULT

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	lddsp	r8, sp[20]

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	cp.w	r8, 0

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	breq	1f

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	st.w	r8[0], r9

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1:	mov	r9, 0

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	rjmp	6b

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	.previous

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