65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
|
||
|
|
* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
|
||
|
|
* Licensed under the GPL
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <setjmp.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
/* These are here rather than tt/uaccess.c because skas mode needs them in
|
||
|
|
* order to do SIGBUS recovery when a tmpfs mount runs out of room.
|
||
|
|
*/
|
||
|
|
|
||
|
|
unsigned long __do_user_copy(void *to, const void *from, int n,
|
||
|
|
void **fault_addr, void **fault_catcher,
|
||
|
|
void (*op)(void *to, const void *from,
|
||
|
|
int n), int *faulted_out)
|
||
|
|
{
|
||
|
|
unsigned long *faddrp = (unsigned long *) fault_addr, ret;
|
||
|
|
|
||
|
|
sigjmp_buf jbuf;
|
||
|
|
*fault_catcher = &jbuf;
|
||
|
|
if(sigsetjmp(jbuf, 1) == 0){
|
||
|
|
(*op)(to, from, n);
|
||
|
|
ret = 0;
|
||
|
|
*faulted_out = 0;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
ret = *faddrp;
|
||
|
|
*faulted_out = 1;
|
||
|
|
}
|
||
|
|
*fault_addr = NULL;
|
||
|
|
*fault_catcher = NULL;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
void __do_copy(void *to, const void *from, int n)
|
||
|
|
{
|
||
|
|
memcpy(to, from, n);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int __do_copy_to_user(void *to, const void *from, int n,
|
||
|
|
void **fault_addr, void **fault_catcher)
|
||
|
|
{
|
||
|
|
unsigned long fault;
|
||
|
|
int faulted;
|
||
|
|
|
||
|
|
fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
|
||
|
|
__do_copy, &faulted);
|
||
|
|
if(!faulted) return(0);
|
||
|
|
else return(n - (fault - (unsigned long) to));
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
||
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
||
|
|
* adjust the settings for this buffer only. This must remain at the end
|
||
|
|
* of the file.
|
||
|
|
* ---------------------------------------------------------------------------
|
||
|
|
* Local variables:
|
||
|
|
* c-file-style: "linux"
|
||
|
|
* End:
|
||
|
|
*/
|