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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #ifndef __UM_UACCESS_H | |
7 | #define __UM_UACCESS_H | |
8 | ||
9 | #include "linux/sched.h" | |
10 | ||
11 | #define VERIFY_READ 0 | |
12 | #define VERIFY_WRITE 1 | |
13 | ||
14 | /* | |
15 | * The fs value determines whether argument validity checking should be | |
16 | * performed or not. If get_fs() == USER_DS, checking is performed, with | |
17 | * get_fs() == KERNEL_DS, checking is bypassed. | |
18 | * | |
19 | * For historical reasons, these macros are grossly misnamed. | |
20 | */ | |
21 | ||
22 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
23 | ||
24 | #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) | |
25 | #define USER_DS MAKE_MM_SEG(TASK_SIZE) | |
26 | ||
27 | #define get_ds() (KERNEL_DS) | |
28 | #define get_fs() (current_thread_info()->addr_limit) | |
29 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
30 | ||
31 | #define segment_eq(a, b) ((a).seg == (b).seg) | |
32 | ||
33 | #include "um_uaccess.h" | |
34 | ||
35 | #define __copy_from_user(to, from, n) copy_from_user(to, from, n) | |
36 | ||
37 | #define __copy_to_user(to, from, n) copy_to_user(to, from, n) | |
38 | ||
39 | #define __copy_to_user_inatomic __copy_to_user | |
40 | #define __copy_from_user_inatomic __copy_from_user | |
41 | ||
42 | #define __get_user(x, ptr) \ | |
43 | ({ \ | |
44 | const __typeof__(ptr) __private_ptr = ptr; \ | |
45 | __typeof__(*(__private_ptr)) __private_val; \ | |
46 | int __private_ret = -EFAULT; \ | |
47358857 | 47 | (x) = (__typeof__(*(__private_ptr)))0; \ |
1da177e4 LT |
48 | if (__copy_from_user(&__private_val, (__private_ptr), \ |
49 | sizeof(*(__private_ptr))) == 0) {\ | |
50 | (x) = (__typeof__(*(__private_ptr))) __private_val; \ | |
51 | __private_ret = 0; \ | |
52 | } \ | |
53 | __private_ret; \ | |
54 | }) | |
55 | ||
56 | #define get_user(x, ptr) \ | |
57 | ({ \ | |
58 | const __typeof__((*(ptr))) __user *private_ptr = (ptr); \ | |
59 | (access_ok(VERIFY_READ, private_ptr, sizeof(*private_ptr)) ? \ | |
60 | __get_user(x, private_ptr) : ((x) = 0, -EFAULT)); \ | |
61 | }) | |
62 | ||
63 | #define __put_user(x, ptr) \ | |
64 | ({ \ | |
65 | __typeof__(ptr) __private_ptr = ptr; \ | |
66 | __typeof__(*(__private_ptr)) __private_val; \ | |
67 | int __private_ret = -EFAULT; \ | |
68 | __private_val = (__typeof__(*(__private_ptr))) (x); \ | |
69 | if (__copy_to_user((__private_ptr), &__private_val, \ | |
70 | sizeof(*(__private_ptr))) == 0) { \ | |
71 | __private_ret = 0; \ | |
72 | } \ | |
73 | __private_ret; \ | |
74 | }) | |
75 | ||
76 | #define put_user(x, ptr) \ | |
77 | ({ \ | |
78 | __typeof__(*(ptr)) __user *private_ptr = (ptr); \ | |
79 | (access_ok(VERIFY_WRITE, private_ptr, sizeof(*private_ptr)) ? \ | |
80 | __put_user(x, private_ptr) : -EFAULT); \ | |
81 | }) | |
82 | ||
83 | #define strlen_user(str) strnlen_user(str, ~0UL >> 1) | |
84 | ||
85 | struct exception_table_entry | |
86 | { | |
87 | unsigned long insn; | |
88 | unsigned long fixup; | |
89 | }; | |
90 | ||
91 | #endif | |
92 | ||
93 | /* | |
94 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
95 | * Emacs will notice this stuff at the end of the file and automatically | |
96 | * adjust the settings for this buffer only. This must remain at the end | |
97 | * of the file. | |
98 | * --------------------------------------------------------------------------- | |
99 | * Local variables: | |
100 | * c-file-style: "linux" | |
101 | * End: | |
102 | */ |