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0aea86a2 CM |
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> | |
338d4f49 | 20 | |
40426882 | 21 | #include <asm/cache.h> |
7c0f6ba6 | 22 | #include <linux/uaccess.h> |
0aea86a2 CM |
23 | |
24 | /* | |
25 | * Copy from user space to user space (alignment handled by the hardware) | |
26 | * | |
27 | * Parameters: | |
28 | * x0 - to | |
29 | * x1 - from | |
30 | * x2 - n | |
31 | * Returns: | |
32 | * x0 - bytes not copied | |
33 | */ | |
40426882 | 34 | .macro ldrb1 ptr, regB, val |
57f4959b | 35 | uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val |
40426882 FK |
36 | .endm |
37 | ||
38 | .macro strb1 ptr, regB, val | |
57f4959b | 39 | uao_user_alternative 9998f, strb, sttrb, \ptr, \regB, \val |
40426882 FK |
40 | .endm |
41 | ||
42 | .macro ldrh1 ptr, regB, val | |
57f4959b | 43 | uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val |
40426882 FK |
44 | .endm |
45 | ||
46 | .macro strh1 ptr, regB, val | |
57f4959b | 47 | uao_user_alternative 9998f, strh, sttrh, \ptr, \regB, \val |
40426882 FK |
48 | .endm |
49 | ||
50 | .macro ldr1 ptr, regB, val | |
57f4959b | 51 | uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val |
40426882 FK |
52 | .endm |
53 | ||
54 | .macro str1 ptr, regB, val | |
57f4959b | 55 | uao_user_alternative 9998f, str, sttr, \ptr, \regB, \val |
40426882 FK |
56 | .endm |
57 | ||
58 | .macro ldp1 ptr, regB, regC, val | |
57f4959b | 59 | uao_ldp 9998f, \ptr, \regB, \regC, \val |
40426882 FK |
60 | .endm |
61 | ||
62 | .macro stp1 ptr, regB, regC, val | |
57f4959b | 63 | uao_stp 9998f, \ptr, \regB, \regC, \val |
40426882 FK |
64 | .endm |
65 | ||
66 | end .req x5 | |
0aea86a2 | 67 | ENTRY(__copy_in_user) |
bd38967d | 68 | uaccess_enable_not_uao x3, x4 |
40426882 FK |
69 | add end, x0, x2 |
70 | #include "copy_template.S" | |
bd38967d | 71 | uaccess_disable_not_uao x3 |
40426882 | 72 | mov x0, #0 |
0aea86a2 CM |
73 | ret |
74 | ENDPROC(__copy_in_user) | |
75 | ||
76 | .section .fixup,"ax" | |
77 | .align 2 | |
40426882 | 78 | 9998: sub x0, end, dst // bytes not copied |
0aea86a2 CM |
79 | ret |
80 | .previous |