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

/*
 *  linux/arch/arm/lib/copy_from_user.S
 *
 *  Author:	Nicolas Pitre
 *  Created:	Sep 29, 2005
 *  Copyright:	MontaVista Software, Inc.
 *
 *  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.
 */

#include <linux/linkage.h>
#include <asm/assembler.h>

/*
 * Prototype:
 *
 *	size_t __copy_from_user(void *to, const void *from, size_t n)
 *
 * Purpose:
 *
 *	copy a block to kernel memory from user memory
 *
 * Params:
 *
 *	to = kernel memory
 *	from = user memory
 *	n = number of bytes to copy
 *
 * Return value:
 *
 *	Number of bytes NOT copied.
 */

#ifndef CONFIG_THUMB2_KERNEL
#define LDR1W_SHIFT	0
#else
#define LDR1W_SHIFT	1
#endif
#define STR1W_SHIFT	0

	.macro ldr1w ptr reg abort
	ldrusr	\reg, \ptr, 4, abort=\abort
	.endm

	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
	ldr1w \ptr, \reg1, \abort
	ldr1w \ptr, \reg2, \abort
	ldr1w \ptr, \reg3, \abort
	ldr1w \ptr, \reg4, \abort
	.endm

	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
	ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort
	ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort
	.endm

	.macro ldr1b ptr reg cond=al abort
	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
	.endm

	.macro str1w ptr reg abort
	W(str) \reg, [\ptr], #4
	.endm

	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
	stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
	.endm

	.macro str1b ptr reg cond=al abort
	str\cond\()b \reg, [\ptr], #1
	.endm

	.macro enter reg1 reg2
	mov	r3, #0
	stmdb	sp!, {r0, r2, r3, \reg1, \reg2}
	.endm

	.macro exit reg1 reg2
	add	sp, sp, #8
	ldmfd	sp!, {r0, \reg1, \reg2}
	.endm

	.text

ENTRY(__copy_from_user)

#include "copy_template.S"

ENDPROC(__copy_from_user)

	.section .fixup,"ax"
	.align 0
	copy_abort_preamble
	ldmfd	sp!, {r1, r2}
	sub	r3, r0, r1
	rsb	r1, r3, r2
	str	r1, [sp]
	bl	__memzero
	ldr	r0, [sp], #4
	copy_abort_end
	.previous
Commit	Line	Data
fadab094 NP	1	/*
	2	* linux/arch/arm/lib/copy_from_user.S
	3	*
	4	* Author: Nicolas Pitre
	5	* Created: Sep 29, 2005
	6	* Copyright: MontaVista Software, Inc.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/linkage.h>
	14	#include <asm/assembler.h>
	15
	16	/*
	17	* Prototype:
	18	*
02fcb974	19	* size_t __copy_from_user(void to, const void from, size_t n)
fadab094 NP	20	*
	21	* Purpose:
	22	*
	23	* copy a block to kernel memory from user memory
	24	*
	25	* Params:
	26	*
	27	* to = kernel memory
	28	* from = user memory
	29	* n = number of bytes to copy
	30	*
	31	* Return value:
	32	*
	33	* Number of bytes NOT copied.
	34	*/
	35
8b592783 CM	36	#ifndef CONFIG_THUMB2_KERNEL
	37	#define LDR1W_SHIFT 0
	38	#else
	39	#define LDR1W_SHIFT 1
	40	#endif
	41	#define STR1W_SHIFT 0
	42
fadab094	43	.macro ldr1w ptr reg abort
8b592783	44	ldrusr \reg, \ptr, 4, abort=\abort
fadab094 NP	45	.endm
	46
	47	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
	48	ldr1w \ptr, \reg1, \abort
	49	ldr1w \ptr, \reg2, \abort
	50	ldr1w \ptr, \reg3, \abort
	51	ldr1w \ptr, \reg4, \abort
	52	.endm
	53
	54	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
	55	ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort
	56	ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort
	57	.endm
	58
	59	.macro ldr1b ptr reg cond=al abort
8b592783	60	ldrusr \reg, \ptr, 1, \cond, abort=\abort
fadab094 NP	61	.endm
	62
	63	.macro str1w ptr reg abort
8b592783	64	W(str) \reg, [\ptr], #4
fadab094 NP	65	.endm
	66
	67	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
	68	stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
	69	.endm
	70
	71	.macro str1b ptr reg cond=al abort
	72	str\cond\()b \reg, [\ptr], #1
	73	.endm
	74
	75	.macro enter reg1 reg2
	76	mov r3, #0
	77	stmdb sp!, {r0, r2, r3, \reg1, \reg2}
	78	.endm
	79
	80	.macro exit reg1 reg2
	81	add sp, sp, #8
	82	ldmfd sp!, {r0, \reg1, \reg2}
	83	.endm
	84
	85	.text
	86
02fcb974	87	ENTRY(__copy_from_user)
fadab094 NP	88
	89	#include "copy_template.S"
	90
93ed3970 CM	91	ENDPROC(__copy_from_user)
93ed3970 CM	92
fadab094 NP	93	.section .fixup,"ax"
	94	.align 0
	95	copy_abort_preamble
	96	ldmfd sp!, {r1, r2}
	97	sub r3, r0, r1
	98	rsb r1, r3, r2
	99	str r1, [sp]
	100	bl __memzero
	101	ldr r0, [sp], #4
	102	copy_abort_end
	103	.previous
	104