LXR linux/arch/um/kernel/uaccess.c

   1/*
   2 * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
   3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   4 * Licensed under the GPL
   5 */
   6
   7/*
   8 * These are here rather than tt/uaccess.c because skas mode needs them in
   9 * order to do SIGBUS recovery when a tmpfs mount runs out of room.
  10 */
  11
  12#include <linux/string.h>
  13#include "os.h"
  14
  15static void __do_copy(void *to, const void *from, int n)
  16{
  17        memcpy(to, from, n);
  18}
  19
  20
  21int __do_copy_to_user(void *to, const void *from, int n,
  22                      void **fault_addr, jmp_buf **fault_catcher)
  23{
  24        unsigned long fault;
  25        int faulted;
  26
  27        fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
  28                               __do_copy, &faulted);
  29        if (!faulted)
  30                return 0;
  31        else
  32                return n - (fault - (unsigned long) to);
  33}
  34