1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2012 ARM Ltd. 4 */ 5 6#include <linux/linkage.h> 7 8#include <asm/asm-uaccess.h> 9#include <asm/assembler.h> 10#include <asm/cache.h> 11 12/* 13 * Copy to user space from a kernel buffer (alignment handled by the hardware) 14 * 15 * Parameters: 16 * x0 - to 17 * x1 - from 18 * x2 - n 19 * Returns: 20 * x0 - bytes not copied 21 */ 22 .macro ldrb1 ptr, regB, val 23 ldrb \ptr, [\regB], \val 24 .endm 25 26 .macro strb1 ptr, regB, val 27 uao_user_alternative 9998f, strb, sttrb, \ptr, \regB, \val 28 .endm 29 30 .macro ldrh1 ptr, regB, val 31 ldrh \ptr, [\regB], \val 32 .endm 33 34 .macro strh1 ptr, regB, val 35 uao_user_alternative 9998f, strh, sttrh, \ptr, \regB, \val 36 .endm 37 38 .macro ldr1 ptr, regB, val 39 ldr \ptr, [\regB], \val 40 .endm 41 42 .macro str1 ptr, regB, val 43 uao_user_alternative 9998f, str, sttr, \ptr, \regB, \val 44 .endm 45 46 .macro ldp1 ptr, regB, regC, val 47 ldp \ptr, \regB, [\regC], \val 48 .endm 49 50 .macro stp1 ptr, regB, regC, val 51 uao_stp 9998f, \ptr, \regB, \regC, \val 52 .endm 53 54end .req x5 55ENTRY(__arch_copy_to_user) 56 uaccess_enable_not_uao x3, x4, x5 57 add end, x0, x2 58#include "copy_template.S" 59 uaccess_disable_not_uao x3, x4 60 mov x0, #0 61 ret 62ENDPROC(__arch_copy_to_user) 63EXPORT_SYMBOL(__arch_copy_to_user) 64 65 .section .fixup,"ax" 66 .align 2 679998: sub x0, end, dst // bytes not copied 68 ret 69 .previous 70