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