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/*
* linux/arch/mips/kernel/ipc.c
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/MIPS
* platform.
*/
#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 <asm/ipc.h>
#include <asm/uaccess.h>
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly. FIXME: Get rid of this wrapper.
*/
asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
{
int version, ret;
lock_kernel();
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
if (call <= SEMCTL)
switch (call) {
case SEMOP:
ret = sys_semop (first, (struct sembuf *)ptr, second);
goto out;
case SEMGET:
ret = sys_semget (first, second, third);
goto out;
case SEMCTL: {
union semun fourth;
ret = -EINVAL;
if (!ptr)
goto out;
ret = -EFAULT;
if (get_user(fourth.__pad, (void **) ptr))
goto out;
ret = sys_semctl (first, second, third, fourth);
goto out;
}
default:
ret = -EINVAL;
goto out;
}
if (call <= MSGCTL)
switch (call) {
case MSGSND:
ret = sys_msgsnd (first, (struct msgbuf *) ptr,
second, third);
goto out;
case MSGRCV:
switch (version) {
case 0: {
struct ipc_kludge tmp;
ret = -EINVAL;
if (!ptr)
goto out;
ret = -EFAULT;
if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
sizeof (tmp)))
goto out;
ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
goto out;
}
case 1: default:
ret = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
goto out;
}
case MSGGET:
ret = sys_msgget ((key_t) first, second);
goto out;
case MSGCTL:
ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
goto out;
default:
ret = -EINVAL;
goto out;
}
if (call <= SHMCTL)
switch (call) {
case SHMAT:
switch (version) {
case 0: default: {
ulong raddr;
ret = sys_shmat (first, (char *) ptr, second, &raddr);
if (ret)
goto out;
ret = put_user (raddr, (ulong *) third);
goto out;
}
case 1: /* iBCS2 emulator entry point */
ret = -EINVAL;
if (get_fs() != get_ds())
goto out;
ret = sys_shmat (first, (char *) ptr, second, (ulong *) third);
goto out;
}
case SHMDT:
ret = sys_shmdt ((char *)ptr);
goto out;
case SHMGET:
ret = sys_shmget (first, second, third);
goto out;
case SHMCTL:
ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
goto out;
default:
ret = -EINVAL;
goto out;
}
else
ret = -EINVAL;
out:
unlock_kernel();
return ret;
}
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