/* *  arch/s390/kernel/sys_s390.c * *  S390 version *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * *  Derived from "arch/i386/kernel/sys_i386.c" * *  This file contains various random system calls that *  have a non-standard calling sequence on the Linux/s390 *  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 <linux/stat.h>#include <linux/mman.h>#include <linux/file.h>#include <linux/utsname.h>#include <asm/uaccess.h>#include <asm/ipc.h>/* * sys_pipe() is the normal C calling standard for creating * a pipe. It's not the way Unix traditionally does this, though. */asmlinkage int sys_pipe(unsigned long * 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;}/* common code for old and new mmaps */static inline long do_mmap2(	unsigned long addr, unsigned long len,	unsigned long prot, unsigned long flags,	unsigned long fd, unsigned long pgoff){	int error = -EBADF;	struct file * file = NULL;	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);	if (!(flags & MAP_ANONYMOUS)) {		file = fget(fd);		if (!file)			goto out;	}	down_write(&current->mm->mmap_sem);	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);	up_write(&current->mm->mmap_sem);	if (file)		fput(file);out:	return error;}/* * Perform the select(nd, in, out, ex, tv) and mmap() system * calls. Linux for S/390 isn't able to handle more than 5 * system call parameters, so these system calls used a memory * block for parameter passing.. */struct mmap_arg_struct {	unsigned long addr;	unsigned long len;	unsigned long prot;	unsigned long flags;	unsigned long fd;	unsigned long offset;};asmlinkage long sys_mmap2(struct mmap_arg_struct *arg){	struct mmap_arg_struct a;	int error = -EFAULT;	if (copy_from_user(&a, arg, sizeof(a)))		goto out;	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);out:	return error;}asmlinkage int old_mmap(struct mmap_arg_struct *arg){	struct mmap_arg_struct a;	int error = -EFAULT;	if (copy_from_user(&a, arg, sizeof(a)))		goto out;	error = -EINVAL;	if (a.offset & ~PAGE_MASK)		goto out;	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);out:	return error;}extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);struct sel_arg_struct {	unsigned long n;	fd_set *inp, *outp, *exp;	struct timeval *tvp;};asmlinkage int old_select(struct sel_arg_struct *arg){	struct sel_arg_struct a;	if (copy_from_user(&a, arg, sizeof(a)))		return -EFAULT;	/* sys_select() does the appropriate kernel locking */	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);}/* * sys_ipc() is the de-multiplexer for the SysV IPC calls.. * * This is really horribly ugly. */asmlinkage int sys_ipc (uint call, int first, int second,                         int third, void *ptr){        struct ipc_kludge tmp;	int ret;        switch (call) {        case SEMOP:                return sys_semop (first, (struct sembuf *)ptr, second);        case SEMGET:                return sys_semget (first, second, third);        case SEMCTL: {                union semun fourth;                if (!ptr)                        return -EINVAL;                if (get_user(fourth.__pad, (void **) ptr))                        return -EFAULT;                return sys_semctl (first, second, third, fourth);        }         case MSGSND:		return sys_msgsnd (first, (struct msgbuf *) ptr,                                    second, third);		break;        case MSGRCV:                if (!ptr)                        return -EINVAL;                if (copy_from_user (&tmp, (struct ipc_kludge *) ptr,                                    sizeof (struct ipc_kludge)))                        return -EFAULT;                return sys_msgrcv (first, tmp.msgp,                                   second, tmp.msgtyp, third);        case MSGGET:                return sys_msgget ((key_t) first, second);        case MSGCTL:                return sys_msgctl (first, second, (struct msqid_ds *) ptr);                	case SHMAT: {		ulong raddr;		ret = sys_shmat (first, (char *) ptr, second, &raddr);		if (ret)			return ret;		return put_user (raddr, (ulong *) third);		break;        }	case SHMDT: 		return sys_shmdt ((char *)ptr);	case SHMGET:		return sys_shmget (first, second, third);	case SHMCTL:		return sys_shmctl (first, second,                                   (struct shmid_ds *) ptr);	default:		return -EINVAL;	}        	return -EINVAL;}/* * Old cruft */asmlinkage int sys_uname(struct old_utsname * name){	int err;	if (!name)		return -EFAULT;	down_read(&uts_sem);	err=copy_to_user(name, &system_utsname, sizeof (*name));	up_read(&uts_sem);	return err?-EFAULT:0;}asmlinkage int sys_olduname(struct oldold_utsname * 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;}asmlinkage int sys_pause(void){	set_current_state(TASK_INTERRUPTIBLE);	schedule();	return -ERESTARTNOHAND;}asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on){  return -ENOSYS;}