| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright (C) 2012 ARM Ltd. |
| */ |
| |
| #include <linux/linkage.h> |
| |
| #include <asm/asm-uaccess.h> |
| #include <asm/assembler.h> |
| #include <asm/cache.h> |
| |
| /* |
| * Copy from user space to a kernel buffer (alignment handled by the hardware) |
| * |
| * Parameters: |
| * x0 - to |
| * x1 - from |
| * x2 - n |
| * Returns: |
| * x0 - bytes not copied |
| */ |
| |
| .macro ldrb1 ptr, regB, val |
| uao_user_alternative 9998f, ldrb, ldtrb, \ptr, \regB, \val |
| .endm |
| |
| .macro strb1 ptr, regB, val |
| strb \ptr, [\regB], \val |
| .endm |
| |
| .macro ldrh1 ptr, regB, val |
| uao_user_alternative 9998f, ldrh, ldtrh, \ptr, \regB, \val |
| .endm |
| |
| .macro strh1 ptr, regB, val |
| strh \ptr, [\regB], \val |
| .endm |
| |
| .macro ldr1 ptr, regB, val |
| uao_user_alternative 9998f, ldr, ldtr, \ptr, \regB, \val |
| .endm |
| |
| .macro str1 ptr, regB, val |
| str \ptr, [\regB], \val |
| .endm |
| |
| .macro ldp1 ptr, regB, regC, val |
| uao_ldp 9998f, \ptr, \regB, \regC, \val |
| .endm |
| |
| .macro stp1 ptr, regB, regC, val |
| stp \ptr, \regB, [\regC], \val |
| .endm |
| |
| end .req x5 |
| ENTRY(__arch_copy_from_user) |
| add end, x0, x2 |
| #include "copy_template.S" |
| mov x0, #0 // Nothing to copy |
| ret |
| ENDPROC(__arch_copy_from_user) |
| EXPORT_SYMBOL(__arch_copy_from_user) |
| |
| .section .fixup,"ax" |
| .align 2 |
| 9998: sub x0, end, dst // bytes not copied |
| ret |
| .previous |
