2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
9 #include "linux/sched.h"
12 #define VERIFY_WRITE 1
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.
19 * For historical reasons, these macros are grossly misnamed.
22 #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
24 #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
25 #define USER_DS MAKE_MM_SEG(TASK_SIZE)
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))
31 #define segment_eq(a, b) ((a).seg == (b).seg)
33 #include "um_uaccess.h"
35 #define __copy_from_user(to, from, n) copy_from_user(to, from, n)
37 #define __copy_to_user(to, from, n) copy_to_user(to, from, n)
39 #define __get_user(x, ptr) \
41 const __typeof__(ptr) __private_ptr = ptr; \
42 __typeof__(*(__private_ptr)) __private_val; \
43 int __private_ret = -EFAULT; \
45 if (__copy_from_user(&__private_val, (__private_ptr), \
46 sizeof(*(__private_ptr))) == 0) {\
47 (x) = (__typeof__(*(__private_ptr))) __private_val; \
53 #define get_user(x, ptr) \
55 const __typeof__((*ptr)) *private_ptr = (ptr); \
56 (access_ok(VERIFY_READ, private_ptr, sizeof(*private_ptr)) ? \
57 __get_user(x, private_ptr) : ((x) = 0, -EFAULT)); \
60 #define __put_user(x, ptr) \
62 __typeof__(ptr) __private_ptr = ptr; \
63 __typeof__(*(__private_ptr)) __private_val; \
64 int __private_ret = -EFAULT; \
65 __private_val = (__typeof__(*(__private_ptr))) (x); \
66 if (__copy_to_user((__private_ptr), &__private_val, \
67 sizeof(*(__private_ptr))) == 0) { \
73 #define put_user(x, ptr) \
75 __typeof__(*(ptr)) *private_ptr = (ptr); \
76 (access_ok(VERIFY_WRITE, private_ptr, sizeof(*private_ptr)) ? \
77 __put_user(x, private_ptr) : -EFAULT); \
80 #define strlen_user(str) strnlen_user(str, ~0UL >> 1)
82 struct exception_table_entry
91 * Overrides for Emacs so that we follow Linus's tabbing style.
92 * Emacs will notice this stuff at the end of the file and automatically
93 * adjust the settings for this buffer only. This must remain at the end
95 * ---------------------------------------------------------------------------
97 * c-file-style: "linux"