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/alternative.h>
20 #include <asm/assembler.h>
21 #include <asm/cpufeature.h>
22 #include <asm/sysreg.h>
25 * Copy to user space from a kernel buffer (alignment handled by the hardware)
32 * x0 - bytes not copied
35 ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \
37 add x5, x0, x2 // upper user buffer boundary
43 USER(9f, stp x3, x4, [x0], #16)
49 USER(9f, str x3, [x0], #8 )
54 USER(9f, str w3, [x0], #4 )
59 USER(9f, strh w3, [x0], #2 )
63 USER(9f, strb w3, [x0] )
65 ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_HAS_PAN, \
68 ENDPROC(__copy_to_user)
72 9: sub x0, x5, x0 // bytes not copied