9218b17149
user_util.h isn't needed any more, so delete it and remove all includes of it. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/*
|
|
* Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
|
|
* Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include "uml_uaccess.h"
|
|
#include "task.h"
|
|
#include "kern_util.h"
|
|
#include "os.h"
|
|
#include "longjmp.h"
|
|
|
|
int __do_copy_from_user(void *to, const void *from, int n,
|
|
void **fault_addr, void **fault_catcher)
|
|
{
|
|
struct tt_regs save = TASK_REGS(get_current())->tt;
|
|
unsigned long fault;
|
|
int faulted;
|
|
|
|
fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
|
|
__do_copy, &faulted);
|
|
TASK_REGS(get_current())->tt = save;
|
|
|
|
if(!faulted)
|
|
return 0;
|
|
else if (fault)
|
|
return n - (fault - (unsigned long) from);
|
|
else
|
|
/* In case of a general protection fault, we don't have the
|
|
* fault address, so NULL is used instead. Pretend we didn't
|
|
* copy anything. */
|
|
return n;
|
|
}
|
|
|
|
static void __do_strncpy(void *dst, const void *src, int count)
|
|
{
|
|
strncpy(dst, src, count);
|
|
}
|
|
|
|
int __do_strncpy_from_user(char *dst, const char *src, unsigned long count,
|
|
void **fault_addr, void **fault_catcher)
|
|
{
|
|
struct tt_regs save = TASK_REGS(get_current())->tt;
|
|
unsigned long fault;
|
|
int faulted;
|
|
|
|
fault = __do_user_copy(dst, src, count, fault_addr, fault_catcher,
|
|
__do_strncpy, &faulted);
|
|
TASK_REGS(get_current())->tt = save;
|
|
|
|
if(!faulted) return(strlen(dst));
|
|
else return(-1);
|
|
}
|
|
|
|
static void __do_clear(void *to, const void *from, int n)
|
|
{
|
|
memset(to, 0, n);
|
|
}
|
|
|
|
int __do_clear_user(void *mem, unsigned long len,
|
|
void **fault_addr, void **fault_catcher)
|
|
{
|
|
struct tt_regs save = TASK_REGS(get_current())->tt;
|
|
unsigned long fault;
|
|
int faulted;
|
|
|
|
fault = __do_user_copy(mem, NULL, len, fault_addr, fault_catcher,
|
|
__do_clear, &faulted);
|
|
TASK_REGS(get_current())->tt = save;
|
|
|
|
if(!faulted) return(0);
|
|
else return(len - (fault - (unsigned long) mem));
|
|
}
|
|
|
|
int __do_strnlen_user(const char *str, unsigned long n,
|
|
void **fault_addr, void **fault_catcher)
|
|
{
|
|
struct tt_regs save = TASK_REGS(get_current())->tt;
|
|
int ret;
|
|
unsigned long *faddrp = (unsigned long *)fault_addr;
|
|
jmp_buf jbuf;
|
|
|
|
*fault_catcher = &jbuf;
|
|
if(UML_SETJMP(&jbuf) == 0)
|
|
ret = strlen(str) + 1;
|
|
else ret = *faddrp - (unsigned long) str;
|
|
|
|
*fault_addr = NULL;
|
|
*fault_catcher = NULL;
|
|
|
|
TASK_REGS(get_current())->tt = save;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
*/
|