1/*
2 * Copy from user space to user space
3 *
4 * Copyright (C) 2012 ARM Ltd.
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 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#include <linux/linkage.h>
20
21#include <asm/alternative.h>
22#include <asm/assembler.h>
23#include <asm/cache.h>
24#include <asm/cpufeature.h>
25#include <asm/sysreg.h>
26
27/*
28 * Copy from user space to user space (alignment handled by the hardware)
29 *
30 * Parameters:
31 *	x0 - to
32 *	x1 - from
33 *	x2 - n
34 * Returns:
35 *	x0 - bytes not copied
36 */
37	.macro ldrb1 ptr, regB, val
38	USER(9998f, ldrb  \ptr, [\regB], \val)
39	.endm
40
41	.macro strb1 ptr, regB, val
42	USER(9998f, strb \ptr, [\regB], \val)
43	.endm
44
45	.macro ldrh1 ptr, regB, val
46	USER(9998f, ldrh  \ptr, [\regB], \val)
47	.endm
48
49	.macro strh1 ptr, regB, val
50	USER(9998f, strh \ptr, [\regB], \val)
51	.endm
52
53	.macro ldr1 ptr, regB, val
54	USER(9998f, ldr \ptr, [\regB], \val)
55	.endm
56
57	.macro str1 ptr, regB, val
58	USER(9998f, str \ptr, [\regB], \val)
59	.endm
60
61	.macro ldp1 ptr, regB, regC, val
62	USER(9998f, ldp \ptr, \regB, [\regC], \val)
63	.endm
64
65	.macro stp1 ptr, regB, regC, val
66	USER(9998f, stp \ptr, \regB, [\regC], \val)
67	.endm
68
69end	.req	x5
70ENTRY(__copy_in_user)
71ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \
72	    CONFIG_ARM64_PAN)
73	add	end, x0, x2
74#include "copy_template.S"
75ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_HAS_PAN, \
76	    CONFIG_ARM64_PAN)
77	mov	x0, #0
78	ret
79ENDPROC(__copy_in_user)
80
81	.section .fixup,"ax"
82	.align	2
839998:	sub	x0, end, dst			// bytes not copied
84	ret
85	.previous
86