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
__do_copy(void * to,const void * from,int n)15 static void __do_copy(void *to, const void *from, int n)
16 {
17 memcpy(to, from, n);
18 }
19
20
__do_copy_to_user(void * to,const void * from,int n,void ** fault_addr,jmp_buf ** fault_catcher)21 int __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