/*
* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include "linux/config.h"
#include "linux/slab.h"
#include "asm/uaccess.h"
#include "asm/ptrace.h"
#include "choose-mode.h"
#include "kern.h"
#ifdef CONFIG_MODE_TT
extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
/* XXX this needs copy_to_user and copy_from_user */
int sys_modify_ldt_tt(int func, void __user *ptr, unsigned long bytecount)
{
if (!access_ok(VERIFY_READ, ptr, bytecount))
return -EFAULT;
return modify_ldt(func, ptr, bytecount);
}
#endif
#ifdef CONFIG_MODE_SKAS
extern int userspace_pid[];
#include "skas_ptrace.h"
int sys_modify_ldt_skas(int func, void __user *ptr, unsigned long bytecount)
{
struct ptrace_ldt ldt;
void *buf;
int res, n;
buf = kmalloc(bytecount, GFP_KERNEL);
if(buf == NULL)
return(-ENOMEM);
res = 0;
switch(func){
case 1:
case 0x11:
res = copy_from_user(buf, ptr, bytecount);
break;
}
if(res != 0){
res = -EFAULT;
goto out;
}
ldt = ((struct ptrace_ldt) { .func = func,
.ptr = buf,
.bytecount = bytecount });
#warning Need to look up userspace_pid by cpu
res = ptrace(PTRACE_LDT, userspace_pid[0], 0, (unsigned long) &ldt);
if(res < 0)
goto out;
switch(func){
case 0:
case 2:
n = res;
res = copy_to_user(ptr, buf, n);
if(res != 0)
res = -EFAULT;
else
res = n;
break;
}
out:
kfree(buf);
return(res);
}
#endif
int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
{
return(CHOOSE_MODE_PROC(sys_modify_ldt_tt, sys_modify_ldt_skas, func,
ptr, bytecount));
}
/*
* 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:
*/
