10aea86a2SCatalin Marinas/* 20aea86a2SCatalin Marinas * Copyright (C) 2012 ARM Ltd. 30aea86a2SCatalin Marinas * 40aea86a2SCatalin Marinas * This program is free software; you can redistribute it and/or modify 50aea86a2SCatalin Marinas * it under the terms of the GNU General Public License version 2 as 60aea86a2SCatalin Marinas * published by the Free Software Foundation. 70aea86a2SCatalin Marinas * 80aea86a2SCatalin Marinas * This program is distributed in the hope that it will be useful, 90aea86a2SCatalin Marinas * but WITHOUT ANY WARRANTY; without even the implied warranty of 100aea86a2SCatalin Marinas * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 110aea86a2SCatalin Marinas * GNU General Public License for more details. 120aea86a2SCatalin Marinas * 130aea86a2SCatalin Marinas * You should have received a copy of the GNU General Public License 140aea86a2SCatalin Marinas * along with this program. If not, see <http://www.gnu.org/licenses/>. 150aea86a2SCatalin Marinas */ 160aea86a2SCatalin Marinas 170aea86a2SCatalin Marinas#include <linux/linkage.h> 18338d4f49SJames Morse 1940426882SFeng Kan#include <asm/cache.h> 20b4b8664dSAl Viro#include <asm/asm-uaccess.h> 210aea86a2SCatalin Marinas 220aea86a2SCatalin Marinas/* 230aea86a2SCatalin Marinas * Copy from user space to a kernel buffer (alignment handled by the hardware) 240aea86a2SCatalin Marinas * 250aea86a2SCatalin Marinas * Parameters: 260aea86a2SCatalin Marinas * x0 - to 270aea86a2SCatalin Marinas * x1 - from 280aea86a2SCatalin Marinas * x2 - n 290aea86a2SCatalin Marinas * Returns: 300aea86a2SCatalin Marinas * x0 - bytes not copied 310aea86a2SCatalin Marinas */ 3240426882SFeng Kan 3340426882SFeng Kan .macro ldrb1 ptr, regB, val 3457f4959bSJames Morse uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val 3540426882SFeng Kan .endm 3640426882SFeng Kan 3740426882SFeng Kan .macro strb1 ptr, regB, val 3840426882SFeng Kan strb \ptr, [\regB], \val 3940426882SFeng Kan .endm 4040426882SFeng Kan 4140426882SFeng Kan .macro ldrh1 ptr, regB, val 4257f4959bSJames Morse uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val 4340426882SFeng Kan .endm 4440426882SFeng Kan 4540426882SFeng Kan .macro strh1 ptr, regB, val 4640426882SFeng Kan strh \ptr, [\regB], \val 4740426882SFeng Kan .endm 4840426882SFeng Kan 4940426882SFeng Kan .macro ldr1 ptr, regB, val 5057f4959bSJames Morse uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val 5140426882SFeng Kan .endm 5240426882SFeng Kan 5340426882SFeng Kan .macro str1 ptr, regB, val 5440426882SFeng Kan str \ptr, [\regB], \val 5540426882SFeng Kan .endm 5640426882SFeng Kan 5740426882SFeng Kan .macro ldp1 ptr, regB, regC, val 5857f4959bSJames Morse uao_ldp 9998f, \ptr, \regB, \regC, \val 5940426882SFeng Kan .endm 6040426882SFeng Kan 6140426882SFeng Kan .macro stp1 ptr, regB, regC, val 6240426882SFeng Kan stp \ptr, \regB, [\regC], \val 6340426882SFeng Kan .endm 6440426882SFeng Kan 6540426882SFeng Kanend .req x5 66bffe1bafSYang ShiENTRY(__arch_copy_from_user) 6727a921e7SWill Deacon uaccess_enable_not_uao x3, x4, x5 6840426882SFeng Kan add end, x0, x2 6940426882SFeng Kan#include "copy_template.S" 706b88a32cSCatalin Marinas uaccess_disable_not_uao x3, x4 7140426882SFeng Kan mov x0, #0 // Nothing to copy 720aea86a2SCatalin Marinas ret 73bffe1bafSYang ShiENDPROC(__arch_copy_from_user) 740aea86a2SCatalin Marinas 750aea86a2SCatalin Marinas .section .fixup,"ax" 760aea86a2SCatalin Marinas .align 2 774855bd25SAl Viro9998: sub x0, end, dst // bytes not copied 780aea86a2SCatalin Marinas ret 790aea86a2SCatalin Marinas .previous 80