1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 *  linux/arch/arm/lib/copy_from_user.S
  4 *
  5 *  Author:	Nicolas Pitre
  6 *  Created:	Sep 29, 2005
  7 *  Copyright:	MontaVista Software, Inc.
 
 
 
 
  8 */
  9
 10#include <linux/linkage.h>
 11#include <asm/assembler.h>
 12#include <asm/unwind.h>
 13
 14/*
 15 * Prototype:
 16 *
 17 *	size_t arm_copy_from_user(void *to, const void *from, size_t n)
 18 *
 19 * Purpose:
 20 *
 21 *	copy a block to kernel memory from user memory
 22 *
 23 * Params:
 24 *
 25 *	to = kernel memory
 26 *	from = user memory
 27 *	n = number of bytes to copy
 28 *
 29 * Return value:
 30 *
 31 *	Number of bytes NOT copied.
 32 */
 33
 34#ifdef CONFIG_CPU_USE_DOMAINS
 35
 36#ifndef CONFIG_THUMB2_KERNEL
 37#define LDR1W_SHIFT	0
 38#else
 39#define LDR1W_SHIFT	1
 40#endif
 
 41
 42	.macro ldr1w ptr reg abort
 43	ldrusr	\reg, \ptr, 4, abort=\abort
 44	.endm
 45
 46	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
 47	ldr1w \ptr, \reg1, \abort
 48	ldr1w \ptr, \reg2, \abort
 49	ldr1w \ptr, \reg3, \abort
 50	ldr1w \ptr, \reg4, \abort
 51	.endm
 52
 53	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 54	ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort
 55	ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort
 56	.endm
 57
 58#else
 59
 60#define LDR1W_SHIFT	0
 61
 62	.macro ldr1w ptr reg abort
 63	USERL(\abort, W(ldr) \reg, [\ptr], #4)
 64	.endm
 65
 66	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
 67	USERL(\abort, ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4})
 68	.endm
 69
 70	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 71	USERL(\abort, ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8})
 72	.endm
 73
 74#endif /* CONFIG_CPU_USE_DOMAINS */
 75
 76	.macro ldr1b ptr reg cond=al abort
 77	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
 78	.endm
 79
 80#define STR1W_SHIFT	0
 81
 82	.macro str1w ptr reg abort
 83	W(str) \reg, [\ptr], #4
 84	.endm
 85
 86	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 87	stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
 88	.endm
 89
 90	.macro str1b ptr reg cond=al abort
 91	strb\cond \reg, [\ptr], #1
 92	.endm
 93
 94	.macro enter regs:vararg
 95	mov	r3, #0
 96UNWIND( .save	{r0, r2, r3, \regs}		)
 97	stmdb	sp!, {r0, r2, r3, \regs}
 98	.endm
 99
100	.macro exit regs:vararg
101	add	sp, sp, #8
102	ldmfd	sp!, {r0, \regs}
103	.endm
104
105	.text
106
107ENTRY(arm_copy_from_user)
108#ifdef CONFIG_CPU_SPECTRE
109	ldr	r3, =TASK_SIZE
110	uaccess_mask_range_ptr r1, r2, r3, ip
111#endif
112
113#include "copy_template.S"
114
115ENDPROC(arm_copy_from_user)
116
117	.pushsection .text.fixup,"ax"
118	.align 0
119	copy_abort_preamble
120	ldmfd	sp!, {r1, r2, r3}
121	sub	r0, r0, r1
122	rsb	r0, r0, r2
 
 
 
123	copy_abort_end
124	.popsection
125

 
  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