/*
* arch/ppc/kernel/sys_ppc.c
*
* PowerPC version
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Derived from "arch/i386/kernel/sys_i386.c"
* Adapted from the i386 version by Gary Thomas
* Modified by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras (paulus@cs.anu.edu.au).
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/PPC
* platform.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/sys.h>
#include <linux/ipc.h>
#include <linux/utsname.h>
#include <linux/file.h>
#include <linux/unistd.h>
#include <asm/uaccess.h>
#include <asm/ipc.h>
#include <asm/semaphore.h>
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly.
*/
int
sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
{
int version, ret;
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
ret = -ENOSYS;
switch (call) {
case SEMOP:
ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
second, NULL);
break;
case SEMTIMEDOP:
ret = sys_semtimedop (first, (struct sembuf __user *)ptr,
second, (const struct timespec __user *) fifth);
break;
case SEMGET:
ret = sys_semget (first, second, third);
break;
case SEMCTL: {
union semun fourth;
if (!ptr)
break;
if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT)
|| (ret = get_user(fourth.__pad, (void __user *__user *)ptr)))
break;
ret = sys_semctl (first, second, third, fourth);
break;
}
case MSGSND:
ret = sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third);
break;
case MSGRCV:
switch (version) {
case 0: {
struct ipc_kludge tmp;
if (!ptr)
break;
if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT)
|| (ret = copy_from_user(&tmp,
(struct ipc_kludge __user *) ptr,
sizeof (tmp)) ? -EFAULT : 0))
break;
ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp,
third);
break;
}
default:
ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
second, fifth, third);
break;
}
break;
case MSGGET:
ret = sys_msgget ((key_t) first, second);
break;
case MSGCTL:
ret = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
break;
case SHMAT: {
ulong raddr;
if ((ret = access_ok(VERIFY_WRITE, (ulong __user *) third,
sizeof(ulong)) ? 0 : -EFAULT))
break;
ret = do_shmat (first, (char __user *) ptr, second, &raddr);
if (ret)
break;
ret = put_user (raddr, (ulong __user *) third);
break;
}
case SHMDT:
ret = sys_shmdt ((char __user *)ptr);
break;
case SHMGET:
ret = sys_shmget (first, second, third);
break;
case SHMCTL:
ret = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
break;
}
return ret;
}
/*
* sys_pipe() is the normal C calling standard for creating
* a pipe. It's not the way unix traditionally does this, though.
*/
int sys_pipe(int __user *fildes)
{
int fd[2];
int error;
error = do_pipe(fd);
if (!error) {
if (copy_to_user(fildes, fd, 2*sizeof(int)))
error = -EFAULT;
}
return error;
}
static inline unsigned long
do_mmap2(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
struct file * file = NULL;
int ret = -EBADF;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
if (!(flags & MAP_ANONYMOUS)) {
if (!(file = fget(fd)))
goto out;
}
down_write(¤t->mm->mmap_sem);
ret = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
up_write(¤t->mm->mmap_sem);
if (file)
fput(file);
out:
return ret;
}
unsigned long sys_mmap2(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
return do_mmap2(addr, len, prot, flags, fd, pgoff);
}
unsigned long sys_mmap(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t offset)
{
int err = -EINVAL;
if (offset & ~PAGE_MASK)
goto out;
err = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
out:
return err;
}
/*
* Due to some executables calling the wrong select we sometimes
* get wrong args. This determines how the args are being passed
* (a single ptr to them all args passed) then calls
* sys_select() with the appropriate args. -- Cort
*/
int
ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
{
if ( (unsigned long)n >= 4096 )
{
unsigned long __user *buffer = (unsigned long __user *)n;
if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
|| __get_user(n, buffer)
|| __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
|| __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
|| __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
|| __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
return -EFAULT;
}
return sys_select(n, inp, outp, exp, tvp);
}
int sys_uname(struct old_utsname __user * name)
{
int err = -EFAULT;
down_read(&uts_sem);
if (name && !copy_to_user(name, &system_utsname, sizeof (*name)))
err = 0;
up_read(&uts_sem);
return err;
}
int sys_olduname(struct oldold_utsname __user * name)
{
int error;
if (!name)
return -EFAULT;
if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
return -EFAULT;
down_read(&uts_sem);
error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
error -= __put_user(0,name->release+__OLD_UTS_LEN);
error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
error -= __put_user(0,name->version+__OLD_UTS_LEN);
error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
error = __put_user(0,name->machine+__OLD_UTS_LEN);
up_read(&uts_sem);
error = error ? -EFAULT : 0;
return error;
}
/*
* We put the arguments in a different order so we only use 6
* registers for arguments, rather than 7 as sys_fadvise64_64 needs
* (because `offset' goes in r5/r6).
*/
long ppc_fadvise64_64(int fd, int advice, loff_t offset, loff_t len)
{
return sys_fadvise64_64(fd, offset, len, advice);
}
