arch/um/include/um_uaccess.h

   1 /*
   2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __ARCH_UM_UACCESS_H
   7 #define __ARCH_UM_UACCESS_H
   8
   9 #include "linux/config.h"
  10 #include "choose-mode.h"
  11
  12 #ifdef CONFIG_MODE_TT
  13 #include "uaccess-tt.h"
  14 #endif
  15
  16 #ifdef CONFIG_MODE_SKAS
  17 #include "uaccess-skas.h"
  18 #endif
  19
  20 #define access_ok(type, addr, size) \
  21         CHOOSE_MODE_PROC(access_ok_tt, access_ok_skas, type, addr, size)
  22
  23 /* this function will go away soon - use access_ok() instead */
  24 static inline int __deprecated verify_area(int type, const void __user *addr, unsigned long size)
  25 {
  26         return (CHOOSE_MODE_PROC(verify_area_tt, verify_area_skas, type, addr,
  27                                 size));
  28 }
  29
  30 static inline int copy_from_user(void *to, const void __user *from, int n)
  31 {
  32         return(CHOOSE_MODE_PROC(copy_from_user_tt, copy_from_user_skas, to,
  33                                 from, n));
  34 }
  35
  36 static inline int copy_to_user(void __user *to, const void *from, int n)
  37 {
  38         return(CHOOSE_MODE_PROC(copy_to_user_tt, copy_to_user_skas, to,
  39                                 from, n));
  40 }
  41
  42 /*
  43  * strncpy_from_user: - Copy a NUL terminated string from userspace.
  44  * @dst:   Destination address, in kernel space.  This buffer must be at
  45  *         least @count bytes long.
  46  * @src:   Source address, in user space.
  47  * @count: Maximum number of bytes to copy, including the trailing NUL.
  48  *
  49  * Copies a NUL-terminated string from userspace to kernel space.
  50  *
  51  * On success, returns the length of the string (not including the trailing
  52  * NUL).
  53  *
  54  * If access to userspace fails, returns -EFAULT (some data may have been
  55  * copied).
  56  *
  57  * If @count is smaller than the length of the string, copies @count bytes
  58  * and returns @count.
  59  */
  60
  61 static inline int strncpy_from_user(char *dst, const char __user *src, int count)
  62 {
  63         return(CHOOSE_MODE_PROC(strncpy_from_user_tt, strncpy_from_user_skas,
  64                                 dst, src, count));
  65 }
  66
  67 /*
  68  * __clear_user: - Zero a block of memory in user space, with less checking.
  69  * @to:   Destination address, in user space.
  70  * @n:    Number of bytes to zero.
  71  *
  72  * Zero a block of memory in user space.  Caller must check
  73  * the specified block with access_ok() before calling this function.
  74  *
  75  * Returns number of bytes that could not be cleared.
  76  * On success, this will be zero.
  77  */
  78 static inline int __clear_user(void *mem, int len)
  79 {
  80         return(CHOOSE_MODE_PROC(__clear_user_tt, __clear_user_skas, mem, len));
  81 }
  82
  83 /*
  84  * clear_user: - Zero a block of memory in user space.
  85  * @to:   Destination address, in user space.
  86  * @n:    Number of bytes to zero.
  87  *
  88  * Zero a block of memory in user space.
  89  *
  90  * Returns number of bytes that could not be cleared.
  91  * On success, this will be zero.
  92  */
  93 static inline int clear_user(void __user *mem, int len)
  94 {
  95         return(CHOOSE_MODE_PROC(clear_user_tt, clear_user_skas, mem, len));
  96 }
  97
  98 /*
  99  * strlen_user: - Get the size of a string in user space.
 100  * @str: The string to measure.
 101  * @n:   The maximum valid length
 102  *
 103  * Get the size of a NUL-terminated string in user space.
 104  *
 105  * Returns the size of the string INCLUDING the terminating NUL.
 106  * On exception, returns 0.
 107  * If the string is too long, returns a value greater than @n.
 108  */
 109 static inline int strnlen_user(const void __user *str, long len)
 110 {
 111         return(CHOOSE_MODE_PROC(strnlen_user_tt, strnlen_user_skas, str, len));
 112 }
 113
 114 #endif
 115
 116 /*
 117  * Overrides for Emacs so that we follow Linus's tabbing style.
 118  * Emacs will notice this stuff at the end of the file and automatically
 119  * adjust the settings for this buffer only.  This must remain at the end
 120  * of the file.
 121  * ---------------------------------------------------------------------------
 122  * Local variables:
 123  * c-file-style: "linux"
 124  * End:
 125  */