arch/um/include/asm/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 <asm/errno.h>
  10 #include <asm/processor.h>
  11
  12 /* thread_info has a mm_segment_t in it, so put the definition up here */
  13 typedef struct {
  14         unsigned long seg;
  15 } mm_segment_t;
  16
  17 #include "linux/thread_info.h"
  18
  19 #define VERIFY_READ 0
  20 #define VERIFY_WRITE 1
  21
  22 /*
  23  * The fs value determines whether argument validity checking should be
  24  * performed or not.  If get_fs() == USER_DS, checking is performed, with
  25  * get_fs() == KERNEL_DS, checking is bypassed.
  26  *
  27  * For historical reasons, these macros are grossly misnamed.
  28  */
  29
  30 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  31
  32 #define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFF)
  33 #define USER_DS         MAKE_MM_SEG(TASK_SIZE)
  34
  35 #define get_ds()        (KERNEL_DS)
  36 #define get_fs()        (current_thread_info()->addr_limit)
  37 #define set_fs(x)       (current_thread_info()->addr_limit = (x))
  38
  39 #define segment_eq(a, b) ((a).seg == (b).seg)
  40
  41 #include "um_uaccess.h"
  42
  43 #define __copy_from_user(to, from, n) copy_from_user(to, from, n)
  44
  45 #define __copy_to_user(to, from, n) copy_to_user(to, from, n)
  46
  47 #define __copy_to_user_inatomic __copy_to_user
  48 #define __copy_from_user_inatomic __copy_from_user
  49
  50 #define __get_user(x, ptr) \
  51 ({ \
  52         const __typeof__(*(ptr)) __user *__private_ptr = (ptr); \
  53         __typeof__(x) __private_val;                    \
  54         int __private_ret = -EFAULT;                    \
  55         (x) = (__typeof__(*(__private_ptr)))0;                          \
  56         if (__copy_from_user((__force void *)&__private_val, (__private_ptr),\
  57                              sizeof(*(__private_ptr))) == 0) {          \
  58                 (x) = (__typeof__(*(__private_ptr))) __private_val;     \
  59                 __private_ret = 0;                                      \
  60         }                                                               \
  61         __private_ret;                                                  \
  62 })
  63
  64 #define get_user(x, ptr) \
  65 ({ \
  66         const __typeof__((*(ptr))) __user *private_ptr = (ptr); \
  67         (access_ok(VERIFY_READ, private_ptr, sizeof(*private_ptr)) ? \
  68          __get_user(x, private_ptr) : ((x) = (__typeof__(*ptr))0, -EFAULT)); \
  69 })
  70
  71 #define __put_user(x, ptr) \
  72 ({ \
  73         __typeof__(*(ptr)) __user *__private_ptr = ptr; \
  74         __typeof__(*(__private_ptr)) __private_val; \
  75         int __private_ret = -EFAULT; \
  76         __private_val = (__typeof__(*(__private_ptr))) (x); \
  77         if (__copy_to_user((__private_ptr), &__private_val, \
  78                            sizeof(*(__private_ptr))) == 0) { \
  79                 __private_ret = 0; \
  80         } \
  81         __private_ret; \
  82 })
  83
  84 #define put_user(x, ptr) \
  85 ({ \
  86         __typeof__(*(ptr)) __user *private_ptr = (ptr); \
  87         (access_ok(VERIFY_WRITE, private_ptr, sizeof(*private_ptr)) ? \
  88          __put_user(x, private_ptr) : -EFAULT); \
  89 })
  90
  91 #define strlen_user(str) strnlen_user(str, ~0U >> 1)
  92
  93 struct exception_table_entry
  94 {
  95         unsigned long insn;
  96         unsigned long fixup;
  97 };
  98
  99 #endif