1/* 2 * Copyright (C) 2012 ARM Ltd. 3 * 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. 7 * 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. 12 * 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/>. 15 */ 16 17#include <linux/linkage.h> 18 19#include <asm/asm-uaccess.h> 20#include <asm/assembler.h> 21#include <asm/cache.h> 22 23/* 24 * Copy from user space to a kernel buffer (alignment handled by the hardware) 25 * 26 * Parameters: 27 * x0 - to 28 * x1 - from 29 * x2 - n 30 * Returns: 31 * x0 - bytes not copied 32 */ 33 34 .macro ldrb1 ptr, regB, val 35 uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val 36 .endm 37 38 .macro strb1 ptr, regB, val 39 strb \ptr, [\regB], \val 40 .endm 41 42 .macro ldrh1 ptr, regB, val 43 uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val 44 .endm 45 46 .macro strh1 ptr, regB, val 47 strh \ptr, [\regB], \val 48 .endm 49 50 .macro ldr1 ptr, regB, val 51 uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val 52 .endm 53 54 .macro str1 ptr, regB, val 55 str \ptr, [\regB], \val 56 .endm 57 58 .macro ldp1 ptr, regB, regC, val 59 uao_ldp 9998f, \ptr, \regB, \regC, \val 60 .endm 61 62 .macro stp1 ptr, regB, regC, val 63 stp \ptr, \regB, [\regC], \val 64 .endm 65 66end .req x5 67ENTRY(__arch_copy_from_user) 68 uaccess_enable_not_uao x3, x4, x5 69 add end, x0, x2 70#include "copy_template.S" 71 uaccess_disable_not_uao x3, x4 72 mov x0, #0 // Nothing to copy 73 ret 74ENDPROC(__arch_copy_from_user) 75EXPORT_SYMBOL(__arch_copy_from_user) 76 77 .section .fixup,"ax" 78 .align 2 799998: sub x0, end, dst // bytes not copied 80 ret 81 .previous 82