[linux-2.6-block.git] / arch / arm / lib / csumpartialcopyuser.S

/*
 *  linux/arch/arm/lib/csumpartialcopyuser.S
 *
 *  Copyright (C) 1995-1998 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.
 *
 * 27/03/03 Ian Molton Clean up CONFIG_CPU
 *
 */
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/errno.h>
#include <asm/asm-offsets.h>

		.text

		.macro	save_regs
		stmfd	sp!, {r1, r2, r4 - r8, lr}
		.endm

		.macro	load_regs
		ldmfd	sp!, {r1, r2, r4 - r8, pc}
		.endm

		.macro	load1b,	reg1
		ldrusr	\reg1, r0, 1
		.endm

		.macro	load2b, reg1, reg2
		ldrusr	\reg1, r0, 1
		ldrusr	\reg2, r0, 1
		.endm

		.macro	load1l, reg1
		ldrusr	\reg1, r0, 4
		.endm

		.macro	load2l, reg1, reg2
		ldrusr	\reg1, r0, 4
		ldrusr	\reg2, r0, 4
		.endm

		.macro	load4l, reg1, reg2, reg3, reg4
		ldrusr	\reg1, r0, 4
		ldrusr	\reg2, r0, 4
		ldrusr	\reg3, r0, 4
		ldrusr	\reg4, r0, 4
		.endm

/*
 * unsigned int
 * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
 *  r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
 *  Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
 */

#define FN_ENTRY	ENTRY(csum_partial_copy_from_user)
#define FN_EXIT		ENDPROC(csum_partial_copy_from_user)

#include "csumpartialcopygeneric.S"

/*
 * FIXME: minor buglet here
 * We don't return the checksum for the data present in the buffer.  To do
 * so properly, we would have to add in whatever registers were loaded before
 * the fault, which, with the current asm above is not predictable.
 */
		.pushsection .fixup,"ax"
		.align	4
9001:		mov	r4, #-EFAULT
		ldr	r5, [fp, #4]		@ *err_ptr
		str	r4, [r5]
		ldmia	sp, {r1, r2}		@ retrieve dst, len
		add	r2, r2, r1
		mov	r0, #0			@ zero the buffer
9002:		teq	r2, r1
		strneb	r0, [r1], #1
		bne	9002b
		load_regs
		.popsection
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/arm/lib/csumpartialcopyuser.S
	3	*
	4	* Copyright (C) 1995-1998 Russell King
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* 27/03/03 Ian Molton Clean up CONFIG_CPU
	11	*
	12	*/
	13	#include <linux/linkage.h>
	14	#include <asm/assembler.h>
	15	#include <asm/errno.h>
e6ae744d	16	#include <asm/asm-offsets.h>
1da177e4 LT	17
	18	.text
	19
	20	.macro save_regs
22acc4e6	21	stmfd sp!, {r1, r2, r4 - r8, lr}
1da177e4 LT	22	.endm
1da177e4 LT	23
90303b10	24	.macro load_regs
22acc4e6	25	ldmfd sp!, {r1, r2, r4 - r8, pc}
1da177e4 LT	26	.endm
	27
	28	.macro load1b, reg1
8b592783	29	ldrusr \reg1, r0, 1
1da177e4 LT	30	.endm
	31
	32	.macro load2b, reg1, reg2
8b592783 CM	33	ldrusr \reg1, r0, 1
8b592783 CM	34	ldrusr \reg2, r0, 1
1da177e4 LT	35	.endm
	36
	37	.macro load1l, reg1
8b592783	38	ldrusr \reg1, r0, 4
1da177e4 LT	39	.endm
	40
	41	.macro load2l, reg1, reg2
8b592783 CM	42	ldrusr \reg1, r0, 4
8b592783 CM	43	ldrusr \reg2, r0, 4
1da177e4 LT	44	.endm
	45
	46	.macro load4l, reg1, reg2, reg3, reg4
8b592783 CM	47	ldrusr \reg1, r0, 4
	48	ldrusr \reg2, r0, 4
	49	ldrusr \reg3, r0, 4
	50	ldrusr \reg4, r0, 4
1da177e4 LT	51	.endm
	52
	53	/*
	54	* unsigned int
	55	* csum_partial_copy_from_user(const char src, char dst, int len, int sum, int *err_ptr)
	56	* r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
	57	* Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
	58	*/
	59
	60	#define FN_ENTRY ENTRY(csum_partial_copy_from_user)
93ed3970	61	#define FN_EXIT ENDPROC(csum_partial_copy_from_user)
1da177e4 LT	62
	63	#include "csumpartialcopygeneric.S"
	64
	65	/*
	66	* FIXME: minor buglet here
	67	* We don't return the checksum for the data present in the buffer. To do
	68	* so properly, we would have to add in whatever registers were loaded before
	69	* the fault, which, with the current asm above is not predictable.
	70	*/
4260415f	71	.pushsection .fixup,"ax"
1da177e4	72	.align 4
8b592783	73	9001: mov r4, #-EFAULT
1da177e4 LT	74	ldr r5, [fp, #4] @ *err_ptr
	75	str r4, [r5]
	76	ldmia sp, {r1, r2} @ retrieve dst, len
	77	add r2, r2, r1
	78	mov r0, #0 @ zero the buffer
8b592783	79	9002: teq r2, r1
1da177e4	80	strneb r0, [r1], #1
8b592783	81	bne 9002b
90303b10	82	load_regs
4260415f	83	.popsection