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#include <asm/unwind.h>
 16
 17/*
 18 * Prototype:
 19 *
 20 *	size_t arm_copy_from_user(void *to, const void *from, size_t n)
 21 *
 22 * Purpose:
 23 *
 24 *	copy a block to kernel memory from user memory
 25 *
 26 * Params:
 27 *
 28 *	to = kernel memory
 29 *	from = user memory
 30 *	n = number of bytes to copy
 31 *
 32 * Return value:
 33 *
 34 *	Number of bytes NOT copied.
 35 */
 36
 
 
 37#ifndef CONFIG_THUMB2_KERNEL
 38#define LDR1W_SHIFT	0
 39#else
 40#define LDR1W_SHIFT	1
 41#endif
 42#define STR1W_SHIFT	0
 43
 44	.macro ldr1w ptr reg abort
 45	ldrusr	\reg, \ptr, 4, abort=\abort
 46	.endm
 47
 48	.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
 49	ldr1w \ptr, \reg1, \abort
 50	ldr1w \ptr, \reg2, \abort
 51	ldr1w \ptr, \reg3, \abort
 52	ldr1w \ptr, \reg4, \abort
 53	.endm
 54
 55	.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 56	ldr4w \ptr, \reg1, \reg2, \reg3, \reg4, \abort
 57	ldr4w \ptr, \reg5, \reg6, \reg7, \reg8, \abort
 58	.endm
 59
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 60	.macro ldr1b ptr reg cond=al abort
 61	ldrusr	\reg, \ptr, 1, \cond, abort=\abort
 62	.endm
 63
 
 
 64	.macro str1w ptr reg abort
 65	W(str) \reg, [\ptr], #4
 66	.endm
 67
 68	.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
 69	stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
 70	.endm
 71
 72	.macro str1b ptr reg cond=al abort
 73	str\cond\()b \reg, [\ptr], #1
 74	.endm
 75
 76	.macro enter reg1 reg2
 77	mov	r3, #0
 78	stmdb	sp!, {r0, r2, r3, \reg1, \reg2}
 
 79	.endm
 80
 81	.macro usave reg1 reg2
 82	UNWIND(	.save {r0, r2, r3, \reg1, \reg2}	)
 83	.endm
 84
 85	.macro exit reg1 reg2
 86	add	sp, sp, #8
 87	ldmfd	sp!, {r0, \reg1, \reg2}
 88	.endm
 89
 90	.text
 91
 92ENTRY(arm_copy_from_user)
 
 
 
 
 93
 94#include "copy_template.S"
 95
 96ENDPROC(arm_copy_from_user)
 97
 98	.pushsection .fixup,"ax"
 99	.align 0
100	copy_abort_preamble
101	ldmfd	sp!, {r1, r2}
102	sub	r3, r0, r1
103	rsb	r1, r3, r2
104	str	r1, [sp]
105	bl	__memzero
106	ldr	r0, [sp], #4
107	copy_abort_end
108	.popsection
109