include/asm-um/uaccess.h

   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__(x) __private_val;                    \
  46         int __private_ret = -EFAULT;                    \
  47         (x) = (__typeof__(*(__private_ptr)))0;                          \
  48         if (__copy_from_user((void *) &__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) = (__typeof__(*ptr))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