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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, 1996, 1997, 2000 by Ralf Baechle
*/
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/utsname.h>
#include <asm/cachectl.h>
#include <asm/pgalloc.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>
/*
* 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 tmp, len, retval, errno;
switch(cmd) {
case SETNAME: {
char nodename[__NEW_UTS_LEN + 1];
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
name = (char *) arg1;
len = strncpy_from_user(nodename, name, sizeof(nodename));
if (len < 0)
return -EFAULT;
down_write(&uts_sem);
strncpy(system_utsname.nodename, name, len);
up_write(&uts_sem);
system_utsname.nodename[len] = '\0';
return 0;
}
case MIPS_ATOMIC_SET: {
unsigned int tmp;
p = (int *) arg1;
errno = verify_area(VERIFY_WRITE, p, sizeof(*p));
if (errno)
return errno;
errno = 0;
__asm__(".set\tpush\t\t\t# sysmips(MIPS_ATOMIC, ...)\n\t"
".set\tnoreorder\n\t"
".set\tnoat\n\t"
"1:\tll\t%0, %4\n\t"
"2:\tmove\t$1, %3\n\t"
"3:\tsc\t$1, %1\n\t"
"beqzl\t$1, 2b\n\t"
"4:\t ll\t%0, %4\n\t"
".set\tpop\n\t"
".section\t.fixup,\"ax\"\n"
"5:\tli\t%2, 1\t\t\t# error\n\t"
".previous\n\t"
".section\t__ex_table,\"a\"\n\t"
".dword\t1b, 5b\n\t"
".dword\t3b, 5b\n\t"
".dword\t4b, 5b\n\t"
".previous\n\t"
: "=&r" (tmp), "=o" (* (u32 *) p), "=r" (errno)
: "r" (arg2), "o" (* (u32 *) p), "2" (errno)
: "$1");
if (errno)
return -EFAULT;
/* We're skipping error handling etc. */
if (current->ptrace & PT_TRACESYS)
syscall_trace();
__asm__ __volatile__(
"move\t$29, %0\n\t"
"j\tret_from_sys_call"
: /* No outputs */
: "r" (&cmd));
/* Unreached */
}
case MIPS_FIXADE:
tmp = current->thread.mflags & ~3;
current->thread.mflags = tmp | (arg1 & 3);
retval = 0;
goto out;
case FLUSH_CACHE:
flush_cache_all();
retval = 0;
goto out;
case MIPS_RDNVRAM:
retval = -EIO;
goto out;
default:
retval = -EINVAL;
goto out;
}
out:
return retval;
}
/*
* No implemented yet ...
*/
asmlinkage int
sys_cachectl(char *addr, int nbytes, int op)
{
return -ENOSYS;
}
asmlinkage int sys_pause(void)
{
current->state = TASK_INTERRUPTIBLE;
schedule();
return -ERESTARTNOHAND;
}
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