tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 (alignment handled by the hardware)
14 *
15 * Parameters:
16 * x0 - to
17 * x1 - from
18 * x2 - n
19 * Returns:
20 * x0 - bytes not copied
21 */
22
23 .macro ldrb1 ptr, regB, val
24 uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val
25 .endm
26
27 .macro strb1 ptr, regB, val
28 strb \ptr, [\regB], \val
29 .endm
30
31 .macro ldrh1 ptr, regB, val
32 uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val
33 .endm
34
35 .macro strh1 ptr, regB, val
36 strh \ptr, [\regB], \val
37 .endm
38
39 .macro ldr1 ptr, regB, val
40 uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val
41 .endm
42
43 .macro str1 ptr, regB, val
44 str \ptr, [\regB], \val
45 .endm
46
47 .macro ldp1 ptr, regB, regC, val
48 uao_ldp 9998f, \ptr, \regB, \regC, \val
49 .endm
50
51 .macro stp1 ptr, regB, regC, val
52 stp \ptr, \regB, [\regC], \val
53 .endm
54
55end .req x5
56ENTRY(__arch_copy_from_user)
57 add end, x0, x2
58#include "copy_template.S"
59 mov x0, #0 // Nothing to copy
60 ret
61ENDPROC(__arch_copy_from_user)
62EXPORT_SYMBOL(__arch_copy_from_user)
63
64 .section .fixup,"ax"
65 .align 2
669998: sub x0, end, dst // bytes not copied
67 ret
68 .previous