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0aea86a2 CM |
1 | /* |
2 | * Copyright (C) 2012 ARM Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | */ | |
16 | ||
17 | #include <linux/linkage.h> | |
338d4f49 | 18 | |
40426882 | 19 | #include <asm/cache.h> |
7c0f6ba6 | 20 | #include <linux/uaccess.h> |
0aea86a2 CM |
21 | |
22 | /* | |
23 | * Copy from user space to a kernel buffer (alignment handled by the hardware) | |
24 | * | |
25 | * Parameters: | |
26 | * x0 - to | |
27 | * x1 - from | |
28 | * x2 - n | |
29 | * Returns: | |
30 | * x0 - bytes not copied | |
31 | */ | |
40426882 FK |
32 | |
33 | .macro ldrb1 ptr, regB, val | |
57f4959b | 34 | uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val |
40426882 FK |
35 | .endm |
36 | ||
37 | .macro strb1 ptr, regB, val | |
38 | strb \ptr, [\regB], \val | |
39 | .endm | |
40 | ||
41 | .macro ldrh1 ptr, regB, val | |
57f4959b | 42 | uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val |
40426882 FK |
43 | .endm |
44 | ||
45 | .macro strh1 ptr, regB, val | |
46 | strh \ptr, [\regB], \val | |
47 | .endm | |
48 | ||
49 | .macro ldr1 ptr, regB, val | |
57f4959b | 50 | uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val |
40426882 FK |
51 | .endm |
52 | ||
53 | .macro str1 ptr, regB, val | |
54 | str \ptr, [\regB], \val | |
55 | .endm | |
56 | ||
57 | .macro ldp1 ptr, regB, regC, val | |
57f4959b | 58 | uao_ldp 9998f, \ptr, \regB, \regC, \val |
40426882 FK |
59 | .endm |
60 | ||
61 | .macro stp1 ptr, regB, regC, val | |
62 | stp \ptr, \regB, [\regC], \val | |
63 | .endm | |
64 | ||
65 | end .req x5 | |
bffe1baf | 66 | ENTRY(__arch_copy_from_user) |
bd38967d | 67 | uaccess_enable_not_uao x3, x4 |
40426882 FK |
68 | add end, x0, x2 |
69 | #include "copy_template.S" | |
bd38967d | 70 | uaccess_disable_not_uao x3 |
40426882 | 71 | mov x0, #0 // Nothing to copy |
0aea86a2 | 72 | ret |
bffe1baf | 73 | ENDPROC(__arch_copy_from_user) |
0aea86a2 CM |
74 | |
75 | .section .fixup,"ax" | |
76 | .align 2 | |
4855bd25 | 77 | 9998: sub x0, end, dst // bytes not copied |
0aea86a2 CM |
78 | ret |
79 | .previous |