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| /*
| * Copyright (C) 2012 ARM Ltd.
| *
| * This program is free software; you can redistribute it and/or modify
| * it under the terms of the GNU General Public License version 2 as
| * published by the Free Software Foundation.
| *
| * This program is distributed in the hope that it will be useful,
| * but WITHOUT ANY WARRANTY; without even the implied warranty of
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| * GNU General Public License for more details.
| *
| * You should have received a copy of the GNU General Public License
| * along with this program. If not, see <http://www.gnu.org/licenses/>.
| */
|
| #include <linux/linkage.h>
|
| #include <asm/cache.h>
| #include <asm/asm-uaccess.h>
|
| /*
| * Copy to user space from a kernel buffer (alignment handled by the hardware)
| *
| * Parameters:
| * x0 - to
| * x1 - from
| * x2 - n
| * Returns:
| * x0 - bytes not copied
| */
| .macro ldrb1 ptr, regB, val
| ldrb \ptr, [\regB], \val
| .endm
|
| .macro strb1 ptr, regB, val
| uao_user_alternative 9998f, strb, sttrb, \ptr, \regB, \val
| .endm
|
| .macro ldrh1 ptr, regB, val
| ldrh \ptr, [\regB], \val
| .endm
|
| .macro strh1 ptr, regB, val
| uao_user_alternative 9997f, strh, sttrh, \ptr, \regB, \val
| .endm
|
| .macro ldr1 ptr, regB, val
| ldr \ptr, [\regB], \val
| .endm
|
| .macro str1 ptr, regB, val
| uao_user_alternative 9997f, str, sttr, \ptr, \regB, \val
| .endm
|
| .macro ldp1 ptr, regB, regC, val
| ldp \ptr, \regB, [\regC], \val
| .endm
|
| .macro stp1 ptr, regB, regC, val
| uao_stp 9997f, \ptr, \regB, \regC, \val
| .endm
|
| end .req x5
| srcin .req x15
| ENTRY(__arch_copy_to_user)
| uaccess_enable_not_uao x3, x4, x5
| add end, x0, x2
| mov srcin, x1
| #include "copy_template.S"
| uaccess_disable_not_uao x3, x4
| mov x0, #0
| ret
| ENDPROC(__arch_copy_to_user)
|
| .section .fixup,"ax"
| .align 2
| 9997: cmp dst, dstin
| b.ne 9998f
| // Before being absolutely sure we couldn't copy anything, try harder
| ldrb tmp1w, [srcin]
| USER(9998f, sttrb tmp1w, [dst])
| add dst, dst, #1
| 9998: sub x0, end, dst // bytes not copied
| uaccess_disable_not_uao x3, x4
| ret
| .previous
|
|
