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/alternative.h> 20#include <asm/assembler.h> 21#include <asm/cache.h> 22#include <asm/cpufeature.h> 23#include <asm/sysreg.h> 24 25/* 26 * Copy to user space from a kernel buffer (alignment handled by the hardware) 27 * 28 * Parameters: 29 * x0 - to 30 * x1 - from 31 * x2 - n 32 * Returns: 33 * x0 - bytes not copied 34 */ 35 .macro ldrb1 ptr, regB, val 36 ldrb \ptr, [\regB], \val 37 .endm 38 39 .macro strb1 ptr, regB, val 40 uao_user_alternative 9998f, strb, sttrb, \ptr, \regB, \val 41 .endm 42 43 .macro ldrh1 ptr, regB, val 44 ldrh \ptr, [\regB], \val 45 .endm 46 47 .macro strh1 ptr, regB, val 48 uao_user_alternative 9998f, strh, sttrh, \ptr, \regB, \val 49 .endm 50 51 .macro ldr1 ptr, regB, val 52 ldr \ptr, [\regB], \val 53 .endm 54 55 .macro str1 ptr, regB, val 56 uao_user_alternative 9998f, str, sttr, \ptr, \regB, \val 57 .endm 58 59 .macro ldp1 ptr, regB, regC, val 60 ldp \ptr, \regB, [\regC], \val 61 .endm 62 63 .macro stp1 ptr, regB, regC, val 64 uao_stp 9998f, \ptr, \regB, \regC, \val 65 .endm 66 67end .req x5 68ENTRY(__copy_to_user) 69ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \ 70 CONFIG_ARM64_PAN) 71 add end, x0, x2 72#include "copy_template.S" 73ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_HAS_PAN, \ 74 CONFIG_ARM64_PAN) 75 mov x0, #0 76 ret 77ENDPROC(__copy_to_user) 78 79 .section .fixup,"ax" 80 .align 2 819998: sub x0, end, dst // bytes not copied 82 ret 83 .previous 84