| /* |
| * Copy from user space to user space |
| * |
| * 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/alternative.h> |
| #include <asm/assembler.h> |
| #include <asm/cache.h> |
| #include <asm/cpufeature.h> |
| #include <asm/sysreg.h> |
| |
| /* |
| * Copy from user space to user space (alignment handled by the hardware) |
| * |
| * Parameters: |
| * x0 - to |
| * x1 - from |
| * x2 - n |
| * Returns: |
| * x0 - bytes not copied |
| */ |
| .macro ldrb1 ptr, regB, val |
| uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val |
| .endm |
| |
| .macro strb1 ptr, regB, val |
| uao_user_alternative 9998f, strb, sttrb, \ptr, \regB, \val |
| .endm |
| |
| .macro ldrh1 ptr, regB, val |
| uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val |
| .endm |
| |
| .macro strh1 ptr, regB, val |
| uao_user_alternative 9998f, strh, sttrh, \ptr, \regB, \val |
| .endm |
| |
| .macro ldr1 ptr, regB, val |
| uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val |
| .endm |
| |
| .macro str1 ptr, regB, val |
| uao_user_alternative 9998f, str, sttr, \ptr, \regB, \val |
| .endm |
| |
| .macro ldp1 ptr, regB, regC, val |
| uao_ldp 9998f, \ptr, \regB, \regC, \val |
| .endm |
| |
| .macro stp1 ptr, regB, regC, val |
| uao_stp 9998f, \ptr, \regB, \regC, \val |
| .endm |
| |
| end .req x5 |
| ENTRY(__copy_in_user) |
| ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_ALT_PAN_NOT_UAO, \ |
| CONFIG_ARM64_PAN) |
| add end, x0, x2 |
| #include "copy_template.S" |
| ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_ALT_PAN_NOT_UAO, \ |
| CONFIG_ARM64_PAN) |
| mov x0, #0 |
| ret |
| ENDPROC(__copy_in_user) |
| |
| .section .fixup,"ax" |
| .align 2 |
| 9998: sub x0, end, dst // bytes not copied |
| ret |
| .previous |
