arch/um/kernel/tt/uaccess.c

   1 /*
   2  * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include "linux/sched.h"
   7 #include "asm/uaccess.h"
   8
   9 int copy_from_user_tt(void *to, const void __user *from, int n)
  10 {
  11         if(!access_ok(VERIFY_READ, from, n))
  12                 return(n);
  13
  14         return(__do_copy_from_user(to, from, n, &current->thread.fault_addr,
  15                                    &current->thread.fault_catcher));
  16 }
  17
  18 int copy_to_user_tt(void __user *to, const void *from, int n)
  19 {
  20         if(!access_ok(VERIFY_WRITE, to, n))
  21                 return(n);
  22
  23         return(__do_copy_to_user(to, from, n, &current->thread.fault_addr,
  24                                  &current->thread.fault_catcher));
  25 }
  26
  27 int strncpy_from_user_tt(char *dst, const char __user *src, int count)
  28 {
  29         int n;
  30
  31         if(!access_ok(VERIFY_READ, src, 1))
  32                 return(-EFAULT);
  33
  34         n = __do_strncpy_from_user(dst, src, count,
  35                                    &current->thread.fault_addr,
  36                                    &current->thread.fault_catcher);
  37         if(n < 0) return(-EFAULT);
  38         return(n);
  39 }
  40
  41 int __clear_user_tt(void __user *mem, int len)
  42 {
  43         return(__do_clear_user(mem, len,
  44                                &current->thread.fault_addr,
  45                                &current->thread.fault_catcher));
  46 }
  47
  48 int clear_user_tt(void __user *mem, int len)
  49 {
  50         if(!access_ok(VERIFY_WRITE, mem, len))
  51                 return(len);
  52
  53         return(__do_clear_user(mem, len, &current->thread.fault_addr,
  54                                &current->thread.fault_catcher));
  55 }
  56
  57 int strnlen_user_tt(const void __user *str, int len)
  58 {
  59         return(__do_strnlen_user(str, len,
  60                                  &current->thread.fault_addr,
  61                                  &current->thread.fault_catcher));
  62 }
  63
  64 /*
  65  * Overrides for Emacs so that we follow Linus's tabbing style.
  66  * Emacs will notice this stuff at the end of the file and automatically
  67  * adjust the settings for this buffer only.  This must remain at the end
  68  * of the file.
  69  * ---------------------------------------------------------------------------
  70  * Local variables:
  71  * c-file-style: "linux"
  72  * End:
  73  */