1/*
 2 *  S390 version
 3 *    Copyright IBM Corp. 1999, 2000
 4 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 5 *               Thomas Spatzier (tspat@de.ibm.com)
 6 *
 7 *  Derived from "arch/i386/kernel/sys_i386.c"
 8 *
 9 *  This file contains various random system calls that
10 *  have a non-standard calling sequence on the Linux/s390
11 *  platform.
12 */
13
14#include <linux/errno.h>
15#include <linux/sched.h>
16#include <linux/mm.h>
17#include <linux/fs.h>
18#include <linux/smp.h>
19#include <linux/sem.h>
20#include <linux/msg.h>
21#include <linux/shm.h>
22#include <linux/stat.h>
23#include <linux/syscalls.h>
24#include <linux/mman.h>
25#include <linux/file.h>
26#include <linux/utsname.h>
27#include <linux/personality.h>
28#include <linux/unistd.h>
29#include <linux/ipc.h>
30#include <linux/uaccess.h>
31#include "entry.h"
32
33/*
34 * Perform the mmap() system call. Linux for S/390 isn't able to handle more
35 * than 5 system call parameters, so this system call uses a memory block
36 * for parameter passing.
37 */
38
39struct s390_mmap_arg_struct {
40	unsigned long addr;
41	unsigned long len;
42	unsigned long prot;
43	unsigned long flags;
44	unsigned long fd;
45	unsigned long offset;
46};
47
48SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
49{
50	struct s390_mmap_arg_struct a;
51	int error = -EFAULT;
52
53	if (copy_from_user(&a, arg, sizeof(a)))
54		goto out;
55	error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
56out:
57	return error;
58}
59
60/*
61 * sys_ipc() is the de-multiplexer for the SysV IPC calls.
62 */
63SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
64		unsigned long, third, void __user *, ptr)
65{
66	if (call >> 16)
67		return -EINVAL;
68	/* The s390 sys_ipc variant has only five parameters instead of six
69	 * like the generic variant. The only difference is the handling of
70	 * the SEMTIMEDOP subcall where on s390 the third parameter is used
71	 * as a pointer to a struct timespec where the generic variant uses
72	 * the fifth parameter.
73	 * Therefore we can call the generic variant by simply passing the
74	 * third parameter also as fifth parameter.
75	 */
76	return sys_ipc(call, first, second, third, ptr, third);
77}
78
79SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
80{
81	unsigned int ret;
82
83	if (personality(current->personality) == PER_LINUX32 &&
84	    personality(personality) == PER_LINUX)
85		personality |= PER_LINUX32;
86	ret = sys_personality(personality);
87	if (personality(ret) == PER_LINUX32)
88		ret &= ~PER_LINUX32;
89
90	return ret;
91}