1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5
6 #include <linux/linkage.h>
7
8 #include <asm/asm-uaccess.h>
9 #include <asm/assembler.h>
10 #include <asm/cache.h>
11
12 /*
13 * Copy from user space to a kernel buffer (al
14 *
15 * Parameters:
16 * x0 - to
17 * x1 - from
18 * x2 - n
19 * Returns:
20 * x0 - bytes not copied
21 */
22
23 .macro ldrb1 reg, ptr, val
24 user_ldst 9998f, ldtrb, \reg, \ptr, \v
25 .endm
26
27 .macro strb1 reg, ptr, val
28 strb \reg, [\ptr], \val
29 .endm
30
31 .macro ldrh1 reg, ptr, val
32 user_ldst 9997f, ldtrh, \reg, \ptr, \v
33 .endm
34
35 .macro strh1 reg, ptr, val
36 strh \reg, [\ptr], \val
37 .endm
38
39 .macro ldr1 reg, ptr, val
40 user_ldst 9997f, ldtr, \reg, \ptr, \va
41 .endm
42
43 .macro str1 reg, ptr, val
44 str \reg, [\ptr], \val
45 .endm
46
47 .macro ldp1 reg1, reg2, ptr, val
48 user_ldp 9997f, \reg1, \reg2, \ptr, \v
49 .endm
50
51 .macro stp1 reg1, reg2, ptr, val
52 stp \reg1, \reg2, [\ptr], \val
53 .endm
54
55 end .req x5
56 srcin .req x15
57 SYM_FUNC_START(__arch_copy_from_user)
58 add end, x0, x2
59 mov srcin, x1
60 #include "copy_template.S"
61 mov x0, #0
62 ret
63
64 // Exception fixups
65 9997: cmp dst, dstin
66 b.ne 9998f
67 // Before being absolutely sure we cou
68 USER(9998f, ldtrb tmp1w, [srcin])
69 strb tmp1w, [dst], #1
70 9998: sub x0, end, dst
71 ret
72 SYM_FUNC_END(__arch_copy_from_user)
73 EXPORT_SYMBOL(__arch_copy_from_user)
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