Merge branch 'for-linus' of git://linux-nfs.org/~bfields/linux
[linux-2.6] / arch / um / os-Linux / 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 #include <stddef.h>
8 #include "longjmp.h"
9
10 unsigned long __do_user_copy(void *to, const void *from, int n,
11                              void **fault_addr, jmp_buf **fault_catcher,
12                              void (*op)(void *to, const void *from,
13                                         int n), int *faulted_out)
14 {
15         unsigned long *faddrp = (unsigned long *) fault_addr, ret;
16
17         jmp_buf jbuf;
18         *fault_catcher = &jbuf;
19         if (UML_SETJMP(&jbuf) == 0) {
20                 (*op)(to, from, n);
21                 ret = 0;
22                 *faulted_out = 0;
23         }
24         else {
25                 ret = *faddrp;
26                 *faulted_out = 1;
27         }
28         *fault_addr = NULL;
29         *fault_catcher = NULL;
30         return ret;
31 }
32