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 *
 19 *	size_t __copy_from_user(void *to, const void *from, size_t n)
 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
 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
 43	.macro ldr1w ptr reg abort
 44	ldrusr	\reg, \ptr, 4, abort=\abort
 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
 60	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
 61	.endm
 62
 63	.macro str1w ptr reg abort
 64	W(str) \reg, [\ptr], #4
 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
 87ENTRY(__copy_from_user)
 88
 89#include "copy_template.S"
 90
 91ENDPROC(__copy_from_user)
 92
 93	.pushsection .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	.popsection
104

  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 *
 19 *	size_t __copy_from_user(void *to, const void *from, size_t n)
 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
 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
 43	.macro ldr1w ptr reg abort
 44	ldrusr	\reg, \ptr, 4, abort=\abort
 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
 60	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
 61	.endm
 62
 63	.macro str1w ptr reg abort
 64	W(str) \reg, [\ptr], #4
 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
 87ENTRY(__copy_from_user)
 88
 89#include "copy_template.S"
 90
 91ENDPROC(__copy_from_user)
 92
 93	.pushsection .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	.popsection
104