Pull ec into release branch
[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, 2002 Jeff Dike (jdike@karaya.com)
4  * Licensed under the GPL
5  */
6
7 #include <setjmp.h>
8 #include <string.h>
9 #include "longjmp.h"
10
11 unsigned long __do_user_copy(void *to, const void *from, int n,
12                              void **fault_addr, void **fault_catcher,
13                              void (*op)(void *to, const void *from,
14                                         int n), int *faulted_out)
15 {
16         unsigned long *faddrp = (unsigned long *) fault_addr, ret;
17         int enable;
18
19         jmp_buf jbuf;
20         *fault_catcher = &jbuf;
21         if(UML_SETJMP(&jbuf, enable) == 0){
22                 (*op)(to, from, n);
23                 ret = 0;
24                 *faulted_out = 0;
25         }
26         else {
27                 ret = *faddrp;
28                 *faulted_out = 1;
29         }
30         *fault_addr = NULL;
31         *fault_catcher = NULL;
32         return ret;
33 }
34