1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 *  S390 version
  4 *    Copyright IBM Corp. 1999, 2000
  5 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
  6 *               Thomas Spatzier (tspat@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/fs.h>
 19#include <linux/smp.h>
 20#include <linux/sem.h>
 21#include <linux/msg.h>
 22#include <linux/shm.h>
 23#include <linux/stat.h>
 24#include <linux/syscalls.h>
 25#include <linux/mman.h>
 26#include <linux/file.h>
 27#include <linux/utsname.h>
 28#include <linux/personality.h>
 29#include <linux/unistd.h>
 30#include <linux/ipc.h>
 31#include <linux/uaccess.h>
 32#include "entry.h"
 33
 34/*
 35 * Perform the mmap() system call. Linux for S/390 isn't able to handle more
 36 * than 5 system call parameters, so this system call uses a memory block
 37 * for parameter passing.
 38 */
 39
 40struct s390_mmap_arg_struct {
 41	unsigned long addr;
 42	unsigned long len;
 43	unsigned long prot;
 44	unsigned long flags;
 45	unsigned long fd;
 46	unsigned long offset;
 47};
 48
 49SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
 50{
 51	struct s390_mmap_arg_struct a;
 52	int error = -EFAULT;
 53
 54	if (copy_from_user(&a, arg, sizeof(a)))
 55		goto out;
 56	error = ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 57out:
 58	return error;
 59}
 60
 61#ifdef CONFIG_SYSVIPC
 62/*
 63 * sys_ipc() is the de-multiplexer for the SysV IPC calls.
 64 */
 65SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
 66		unsigned long, third, void __user *, ptr)
 67{
 68	if (call >> 16)
 69		return -EINVAL;
 70	/* The s390 sys_ipc variant has only five parameters instead of six
 71	 * like the generic variant. The only difference is the handling of
 72	 * the SEMTIMEDOP subcall where on s390 the third parameter is used
 73	 * as a pointer to a struct timespec where the generic variant uses
 74	 * the fifth parameter.
 75	 * Therefore we can call the generic variant by simply passing the
 76	 * third parameter also as fifth parameter.
 77	 */
 78	return ksys_ipc(call, first, second, third, ptr, third);
 79}
 80#endif /* CONFIG_SYSVIPC */
 81
 82SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
 83{
 84	unsigned int ret = current->personality;
 85
 86	if (personality(current->personality) == PER_LINUX32 &&
 87	    personality(personality) == PER_LINUX)
 88		personality |= PER_LINUX32;
 89
 90	if (personality != 0xffffffff)
 91		set_personality(personality);
 92
 93	if (personality(ret) == PER_LINUX32)
 94		ret &= ~PER_LINUX32;
 95
 96	return ret;
 97}
 98
 99SYSCALL_DEFINE0(ni_syscall)
100{
101	return -ENOSYS;
102}