2 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
17 #include <linux/linkage.h>
19 #include <asm/asm-uaccess.h>
20 #include <asm/assembler.h>
21 #include <asm/cache.h>
24 * Copy from user space to a kernel buffer (alignment handled by the hardware)
31 * x0 - bytes not copied
34 .macro ldrb1 ptr, regB, val
35 uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val
38 .macro strb1 ptr, regB, val
39 strb \ptr, [\regB], \val
42 .macro ldrh1 ptr, regB, val
43 uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val
46 .macro strh1 ptr, regB, val
47 strh \ptr, [\regB], \val
50 .macro ldr1 ptr, regB, val
51 uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val
54 .macro str1 ptr, regB, val
55 str \ptr, [\regB], \val
58 .macro ldp1 ptr, regB, regC, val
59 uao_ldp 9998f, \ptr, \regB, \regC, \val
62 .macro stp1 ptr, regB, regC, val
63 stp \ptr, \regB, [\regC], \val
67 ENTRY(__arch_copy_from_user)
68 uaccess_enable_not_uao x3, x4, x5
70 #include "copy_template.S"
71 uaccess_disable_not_uao x3, x4
72 mov x0, #0 // Nothing to copy
74 ENDPROC(__arch_copy_from_user)
75 EXPORT_SYMBOL(__arch_copy_from_user)
79 9998: sub x0, end, dst // bytes not copied