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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | /* |
| 3 | * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) |
| 4 | * Copyright (C) 2015 Richard Weinberger (richard@nod.at) |
| 5 | */ |
| 6 | |
| 7 | #ifndef __UM_UACCESS_H |
| 8 | #define __UM_UACCESS_H |
| 9 | |
| 10 | #include <asm/elf.h> |
| 11 | #include <linux/unaligned.h> |
| 12 | #include <sysdep/faultinfo.h> |
| 13 | |
| 14 | #define __under_task_size(addr, size) \ |
| 15 | (((unsigned long) (addr) < TASK_SIZE) && \ |
| 16 | (((unsigned long) (addr) + (size)) < TASK_SIZE)) |
| 17 | |
| 18 | #define __addr_range_nowrap(addr, size) \ |
| 19 | ((unsigned long) (addr) <= ((unsigned long) (addr) + (size))) |
| 20 | |
| 21 | extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n); |
| 22 | extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n); |
| 23 | extern unsigned long __clear_user(void __user *mem, unsigned long len); |
| 24 | static inline int __access_ok(const void __user *ptr, unsigned long size); |
| 25 | |
| 26 | /* Teach asm-generic/uaccess.h that we have C functions for these. */ |
| 27 | #define __access_ok __access_ok |
| 28 | #define __clear_user __clear_user |
| 29 | |
| 30 | #define INLINE_COPY_FROM_USER |
| 31 | #define INLINE_COPY_TO_USER |
| 32 | |
| 33 | #include <asm-generic/uaccess.h> |
| 34 | |
| 35 | static inline int __access_ok(const void __user *ptr, unsigned long size) |
| 36 | { |
| 37 | unsigned long addr = (unsigned long)ptr; |
| 38 | return __addr_range_nowrap(addr, size) && __under_task_size(addr, size); |
| 39 | } |
| 40 | |
| 41 | #define __get_kernel_nofault(dst, src, type, err_label) \ |
| 42 | do { \ |
| 43 | int __faulted; \ |
| 44 | \ |
| 45 | ___backtrack_faulted(__faulted); \ |
| 46 | if (__faulted) { \ |
| 47 | *((type *)dst) = (type) 0; \ |
| 48 | goto err_label; \ |
| 49 | } \ |
| 50 | *((type *)dst) = get_unaligned((type *)(src)); \ |
| 51 | barrier(); \ |
| 52 | current->thread.segv_continue = NULL; \ |
| 53 | } while (0) |
| 54 | |
| 55 | #define __put_kernel_nofault(dst, src, type, err_label) \ |
| 56 | do { \ |
| 57 | int __faulted; \ |
| 58 | \ |
| 59 | ___backtrack_faulted(__faulted); \ |
| 60 | if (__faulted) \ |
| 61 | goto err_label; \ |
| 62 | put_unaligned(*((type *)src), (type *)(dst)); \ |
| 63 | barrier(); \ |
| 64 | current->thread.segv_continue = NULL; \ |
| 65 | } while (0) |
| 66 | |
| 67 | #endif |
| 68 |
Warning: This file is not a C or C++ file. It does not have highlighting.