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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 JM |
20 | |
21 | #include <asm/alternative.h> | |
0aea86a2 | 22 | #include <asm/assembler.h> |
40426882 | 23 | #include <asm/cache.h> |
338d4f49 JM |
24 | #include <asm/cpufeature.h> |
25 | #include <asm/sysreg.h> | |
0aea86a2 CM |
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 | */ | |
40426882 | 37 | .macro ldrb1 ptr, regB, val |
57f4959b | 38 | uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val |
40426882 FK |
39 | .endm |
40 | ||
41 | .macro strb1 ptr, regB, val | |
57f4959b | 42 | uao_user_alternative 9998f, strb, sttrb, \ptr, \regB, \val |
40426882 FK |
43 | .endm |
44 | ||
45 | .macro ldrh1 ptr, regB, val | |
57f4959b | 46 | uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val |
40426882 FK |
47 | .endm |
48 | ||
49 | .macro strh1 ptr, regB, val | |
57f4959b | 50 | uao_user_alternative 9998f, strh, sttrh, \ptr, \regB, \val |
40426882 FK |
51 | .endm |
52 | ||
53 | .macro ldr1 ptr, regB, val | |
57f4959b | 54 | uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val |
40426882 FK |
55 | .endm |
56 | ||
57 | .macro str1 ptr, regB, val | |
57f4959b | 58 | uao_user_alternative 9998f, str, sttr, \ptr, \regB, \val |
40426882 FK |
59 | .endm |
60 | ||
61 | .macro ldp1 ptr, regB, regC, val | |
57f4959b | 62 | uao_ldp 9998f, \ptr, \regB, \regC, \val |
40426882 FK |
63 | .endm |
64 | ||
65 | .macro stp1 ptr, regB, regC, val | |
57f4959b | 66 | uao_stp 9998f, \ptr, \regB, \regC, \val |
40426882 FK |
67 | .endm |
68 | ||
69 | end .req x5 | |
0aea86a2 | 70 | ENTRY(__copy_in_user) |
70544196 | 71 | ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_ALT_PAN_NOT_UAO, \ |
338d4f49 | 72 | CONFIG_ARM64_PAN) |
40426882 FK |
73 | add end, x0, x2 |
74 | #include "copy_template.S" | |
70544196 | 75 | ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_ALT_PAN_NOT_UAO, \ |
338d4f49 | 76 | CONFIG_ARM64_PAN) |
40426882 | 77 | mov x0, #0 |
0aea86a2 CM |
78 | ret |
79 | ENDPROC(__copy_in_user) | |
80 | ||
81 | .section .fixup,"ax" | |
82 | .align 2 | |
40426882 | 83 | 9998: sub x0, end, dst // bytes not copied |
0aea86a2 CM |
84 | ret |
85 | .previous |