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 from user space to 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 23 .macro ldrb1 ptr, regB, val 24 uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val 25 .endm 26 27 .macro strb1 ptr, regB, val 28 strb \ptr, [\regB], \val 29 .endm 30 31 .macro ldrh1 ptr, regB, val 32 uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val 33 .endm 34 35 .macro strh1 ptr, regB, val 36 strh \ptr, [\regB], \val 37 .endm 38 39 .macro ldr1 ptr, regB, val 40 uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val 41 .endm 42 43 .macro str1 ptr, regB, val 44 str \ptr, [\regB], \val 45 .endm 46 47 .macro ldp1 ptr, regB, regC, val 48 uao_ldp 9998f, \ptr, \regB, \regC, \val 49 .endm 50 51 .macro stp1 ptr, regB, regC, val 52 stp \ptr, \regB, [\regC], \val 53 .endm 54 55end .req x5 56ENTRY(__arch_copy_from_user) 57 add end, x0, x2 58#include "copy_template.S" 59 mov x0, #0 // Nothing to copy 60 ret 61ENDPROC(__arch_copy_from_user) 62EXPORT_SYMBOL(__arch_copy_from_user) 63 64 .section .fixup,"ax" 65 .align 2 669998: sub x0, end, dst // bytes not copied 67 ret 68 .previous 69