| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | |
| 54 | end .req x5 |
| 55 | SYM_FUNC_START(__arch_copy_to_user) |
| 56 | add end, x0, x2 |
| 57 | #include "copy_template.S" |
| 58 | mov x0, #0 |
| 59 | ret |
| 60 | SYM_FUNC_END(__arch_copy_to_user) |
| 61 | EXPORT_SYMBOL(__arch_copy_to_user) |
| 62 | |
| 63 | .section .fixup,"ax" |
| 64 | .align 2 |
| 65 | 9998: sub x0, end, dst // bytes not copied |
| 66 | ret |
| 67 | .previous |