tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
20
21#include <asm/alternative.h>
22#include <asm/assembler.h>
23#include <asm/cache.h>
24#include <asm/cpufeature.h>
25#include <asm/sysreg.h>
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 */
37 .macro ldrb1 ptr, regB, val
38 uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val
39 .endm
40
41 .macro strb1 ptr, regB, val
42 uao_user_alternative 9998f, strb, sttrb, \ptr, \regB, \val
43 .endm
44
45 .macro ldrh1 ptr, regB, val
46 uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val
47 .endm
48
49 .macro strh1 ptr, regB, val
50 uao_user_alternative 9998f, strh, sttrh, \ptr, \regB, \val
51 .endm
52
53 .macro ldr1 ptr, regB, val
54 uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val
55 .endm
56
57 .macro str1 ptr, regB, val
58 uao_user_alternative 9998f, str, sttr, \ptr, \regB, \val
59 .endm
60
61 .macro ldp1 ptr, regB, regC, val
62 uao_ldp 9998f, \ptr, \regB, \regC, \val
63 .endm
64
65 .macro stp1 ptr, regB, regC, val
66 uao_stp 9998f, \ptr, \regB, \regC, \val
67 .endm
68
69end .req x5
70ENTRY(__copy_in_user)
71ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_ALT_PAN_NOT_UAO, \
72 CONFIG_ARM64_PAN)
73 add end, x0, x2
74#include "copy_template.S"
75ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_ALT_PAN_NOT_UAO, \
76 CONFIG_ARM64_PAN)
77 mov x0, #0
78 ret
79ENDPROC(__copy_in_user)
80
81 .section .fixup,"ax"
82 .align 2
839998: sub x0, end, dst // bytes not copied
84 ret
85 .previous