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/*
* MIPS specific syscalls
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995 by Ralf Baechle
*/
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/utsname.h>
#include <asm/cachectl.h>
#include <asm/pgtable.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>
static inline size_t
strnlen_user(const char *s, size_t count)
{
return strnlen(s, count);
}
/*
* How long a hostname can we get from user space?
* -EFAULT if invalid area or too long
* 0 if ok
* >0 EFAULT after xx bytes
*/
static inline int
get_max_hostname(unsigned long address)
{
struct vm_area_struct * vma;
vma = find_vma(current->mm, address);
if (!vma || vma->vm_start > address || !(vma->vm_flags & VM_READ))
return -EFAULT;
address = vma->vm_end - address;
if (address > PAGE_SIZE)
return 0;
if (vma->vm_next && vma->vm_next->vm_start == vma->vm_end &&
(vma->vm_next->vm_flags & VM_READ))
return 0;
return address;
}
asmlinkage int
sys_sysmips(int cmd, int arg1, int arg2, int arg3)
{
int *p;
char *name;
int flags, tmp, len, retval = -EINVAL;
switch(cmd)
{
case SETNAME:
if (!suser())
return -EPERM;
name = (char *) arg1;
len = get_max_hostname((unsigned long)name);
if (retval < 0)
return len;
len = strnlen_user(name, retval);
if (len == 0 || len > __NEW_UTS_LEN)
return -EINVAL;
copy_from_user(system_utsname.nodename, name, len);
system_utsname.nodename[len] = '\0';
return 0;
case MIPS_ATOMIC_SET:
p = (int *) arg1;
retval = verify_area(VERIFY_WRITE, p, sizeof(*p));
if(retval)
return -EINVAL;
save_flags(flags);
cli();
retval = *p;
*p = arg2;
restore_flags(flags);
return retval;
case MIPS_FIXADE:
tmp = current->tss.mflags & ~3;
current->tss.mflags = tmp | (arg1 & 3);
retval = 0;
break;
case FLUSH_CACHE:
flush_cache_all();
break;
}
return retval;
}
/*
* No implemented yet ...
*/
asmlinkage int
sys_cachectl(char *addr, int nbytes, int op)
{
return -ENOSYS;
}
/* For emulation of various binary types, and their shared libs,
* we need this.
*/
extern int do_open_namei(const char *pathname, int flag, int mode,
struct inode **res_inode, struct inode *base);
/* Only one at this time. */
#define IRIX32_EMUL "/usr/gnemul/irix"
int open_namei(const char *pathname, int flag, int mode,
struct inode **res_inode, struct inode *base)
{
if(!base && (current->personality == PER_IRIX32) &&
*pathname == '/') {
struct inode *emul_ino;
const char *p = pathname;
char *emul_path = IRIX32_EMUL;
int v;
while (*p == '/')
p++;
if(do_open_namei (emul_path, flag, mode, &emul_ino, NULL) >= 0 &&
emul_ino) {
v = do_open_namei (p, flag, mode, res_inode, emul_ino);
if(v >= 0)
return v;
}
}
return do_open_namei (pathname, flag, mode, res_inode, base);
}
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