1/*
2 *  arch/s390/kernel/sys_s390.c
3 *
4 *  S390 version
5 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
7 *
8 *  Derived from "arch/i386/kernel/sys_i386.c"
9 *
10 *  This file contains various random system calls that
11 *  have a non-standard calling sequence on the Linux/s390
12 *  platform.
13 */
14
15#include <linux/errno.h>
16#include <linux/sched.h>
17#include <linux/mm.h>
18#include <linux/smp.h>
19#include <linux/smp_lock.h>
20#include <linux/sem.h>
21#include <linux/msg.h>
22#include <linux/shm.h>
23#include <linux/stat.h>
24#include <linux/mman.h>
25#include <linux/file.h>
26#include <linux/utsname.h>
27
28#include <asm/uaccess.h>
29#include <asm/ipc.h>
30
31/*
32 * sys_pipe() is the normal C calling standard for creating
33 * a pipe. It's not the way Unix traditionally does this, though.
34 */
35asmlinkage int sys_pipe(unsigned long * fildes)
36{
37	int fd[2];
38	int error;
39
40	error = do_pipe(fd);
41	if (!error) {
42		if (copy_to_user(fildes, fd, 2*sizeof(int)))
43			error = -EFAULT;
44	}
45	return error;
46}
47
48/* common code for old and new mmaps */
49static inline long do_mmap2(
50	unsigned long addr, unsigned long len,
51	unsigned long prot, unsigned long flags,
52	unsigned long fd, unsigned long pgoff)
53{
54	int error = -EBADF;
55	struct file * file = NULL;
56
57	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
58	if (!(flags & MAP_ANONYMOUS)) {
59		file = fget(fd);
60		if (!file)
61			goto out;
62	}
63
64	down_write(&current->mm->mmap_sem);
65	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
66	up_write(&current->mm->mmap_sem);
67
68	if (file)
69		fput(file);
70out:
71	return error;
72}
73
74/*
75 * Perform the select(nd, in, out, ex, tv) and mmap() system
76 * calls. Linux for S/390 isn't able to handle more than 5
77 * system call parameters, so these system calls used a memory
78 * block for parameter passing..
79 */
80
81struct mmap_arg_struct {
82	unsigned long addr;
83	unsigned long len;
84	unsigned long prot;
85	unsigned long flags;
86	unsigned long fd;
87	unsigned long offset;
88};
89
90asmlinkage long sys_mmap2(struct mmap_arg_struct *arg)
91{
92	struct mmap_arg_struct a;
93	int error = -EFAULT;
94
95	if (copy_from_user(&a, arg, sizeof(a)))
96		goto out;
97	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
98out:
99	return error;
100}
101
102asmlinkage int old_mmap(struct mmap_arg_struct *arg)
103{
104	struct mmap_arg_struct a;
105	int error = -EFAULT;
106
107	if (copy_from_user(&a, arg, sizeof(a)))
108		goto out;
109
110	error = -EINVAL;
111	if (a.offset & ~PAGE_MASK)
112		goto out;
113
114	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
115out:
116	return error;
117}
118
119extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
120
121struct sel_arg_struct {
122	unsigned long n;
123	fd_set *inp, *outp, *exp;
124	struct timeval *tvp;
125};
126
127asmlinkage int old_select(struct sel_arg_struct *arg)
128{
129	struct sel_arg_struct a;
130
131	if (copy_from_user(&a, arg, sizeof(a)))
132		return -EFAULT;
133	/* sys_select() does the appropriate kernel locking */
134	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
135}
136
137/*
138 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
139 *
140 * This is really horribly ugly.
141 */
142asmlinkage int sys_ipc (uint call, int first, int second,
143                        int third, void *ptr)
144{
145        struct ipc_kludge tmp;
146	int ret;
147
148        switch (call) {
149        case SEMOP:
150                return sys_semop (first, (struct sembuf *)ptr, second);
151        case SEMGET:
152                return sys_semget (first, second, third);
153        case SEMCTL: {
154                union semun fourth;
155                if (!ptr)
156                        return -EINVAL;
157                if (get_user(fourth.__pad, (void **) ptr))
158                        return -EFAULT;
159                return sys_semctl (first, second, third, fourth);
160        }
161        case MSGSND:
162		return sys_msgsnd (first, (struct msgbuf *) ptr,
163                                   second, third);
164		break;
165        case MSGRCV:
166                if (!ptr)
167                        return -EINVAL;
168                if (copy_from_user (&tmp, (struct ipc_kludge *) ptr,
169                                    sizeof (struct ipc_kludge)))
170                        return -EFAULT;
171                return sys_msgrcv (first, tmp.msgp,
172                                   second, tmp.msgtyp, third);
173        case MSGGET:
174                return sys_msgget ((key_t) first, second);
175        case MSGCTL:
176                return sys_msgctl (first, second, (struct msqid_ds *) ptr);
177
178	case SHMAT: {
179		ulong raddr;
180		ret = sys_shmat (first, (char *) ptr, second, &raddr);
181		if (ret)
182			return ret;
183		return put_user (raddr, (ulong *) third);
184		break;
185        }
186	case SHMDT:
187		return sys_shmdt ((char *)ptr);
188	case SHMGET:
189		return sys_shmget (first, second, third);
190	case SHMCTL:
191		return sys_shmctl (first, second,
192                                   (struct shmid_ds *) ptr);
193	default:
194		return -EINVAL;
195
196	}
197
198	return -EINVAL;
199}
200
201/*
202 * Old cruft
203 */
204asmlinkage int sys_uname(struct old_utsname * name)
205{
206	int err;
207	if (!name)
208		return -EFAULT;
209	down_read(&uts_sem);
210	err=copy_to_user(name, &system_utsname, sizeof (*name));
211	up_read(&uts_sem);
212	return err?-EFAULT:0;
213}
214
215asmlinkage int sys_olduname(struct oldold_utsname * name)
216{
217	int error;
218
219	if (!name)
220		return -EFAULT;
221	if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
222		return -EFAULT;
223
224  	down_read(&uts_sem);
225
226	error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
227	error |= __put_user(0,name->sysname+__OLD_UTS_LEN);
228	error |= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
229	error |= __put_user(0,name->nodename+__OLD_UTS_LEN);
230	error |= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
231	error |= __put_user(0,name->release+__OLD_UTS_LEN);
232	error |= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
233	error |= __put_user(0,name->version+__OLD_UTS_LEN);
234	error |= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
235	error |= __put_user(0,name->machine+__OLD_UTS_LEN);
236
237	up_read(&uts_sem);
238
239	error = error ? -EFAULT : 0;
240
241	return error;
242}
243
244asmlinkage int sys_pause(void)
245{
246	set_current_state(TASK_INTERRUPTIBLE);
247	schedule();
248	return -ERESTARTNOHAND;
249}
250
251asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
252{
253  return -ENOSYS;
254}
255
256