arch/um/kernel/uaccess.c

   1 /*
   2  * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
   3  * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
   4  * Licensed under the GPL
   5  */
   6
   7 /* These are here rather than tt/uaccess.c because skas mode needs them in
   8  * order to do SIGBUS recovery when a tmpfs mount runs out of room.
   9  */
  10
  11 #include <linux/string.h>
  12 #include "os.h"
  13
  14 void __do_copy(void *to, const void *from, int n)
  15 {
  16         memcpy(to, from, n);
  17 }
  18
  19
  20 int __do_copy_to_user(void *to, const void *from, int n,
  21                       void **fault_addr, jmp_buf **fault_catcher)
  22 {
  23         unsigned long fault;
  24         int faulted;
  25
  26         fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
  27                                __do_copy, &faulted);
  28         if(!faulted) return(0);
  29         else return(n - (fault - (unsigned long) to));
  30 }