// SPDX-License-Identifier: GPL-2.0

  /*

   *  S390 version

   *    Copyright IBM Corp. 1999, 2000

   *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   *               Thomas Spatzier (tspat@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/fs.h>

  #include <linux/smp.h>

  #include <linux/sem.h>
  #include <linux/msg.h>
  #include <linux/shm.h>
  #include <linux/stat.h>
  #include <linux/syscalls.h>
  #include <linux/mman.h>
  #include <linux/file.h>
  #include <linux/utsname.h>

  #include <linux/personality.h>

  #include <linux/unistd.h>

  #include <linux/ipc.h>

  #include <linux/uaccess.h>

  #include "entry.h"

  /*

   * Perform the mmap() system call. Linux for S/390 isn't able to handle more
   * than 5 system call parameters, so this system call uses a memory block
   * for parameter passing.

   */

  struct s390_mmap_arg_struct {

  	unsigned long addr;
  	unsigned long len;
  	unsigned long prot;
  	unsigned long flags;
  	unsigned long fd;
  	unsigned long offset;
  };

  SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)

  {

  	struct s390_mmap_arg_struct a;

  	int error = -EFAULT;
  
  	if (copy_from_user(&a, arg, sizeof(a)))
  		goto out;

  	error = ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);

  out:
  	return error;
  }

  #ifdef CONFIG_SYSVIPC

  /*

   * sys_ipc() is the de-multiplexer for the SysV IPC calls.

   */

  SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,

  		unsigned long, third, void __user *, ptr)

  {

  	if (call >> 16)
  		return -EINVAL;
  	/* The s390 sys_ipc variant has only five parameters instead of six
  	 * like the generic variant. The only difference is the handling of
  	 * the SEMTIMEDOP subcall where on s390 the third parameter is used
  	 * as a pointer to a struct timespec where the generic variant uses
  	 * the fifth parameter.
  	 * Therefore we can call the generic variant by simply passing the
  	 * third parameter also as fifth parameter.
  	 */

  	return ksys_ipc(call, first, second, third, ptr, third);

  }

  #endif /* CONFIG_SYSVIPC */

  SYSCALL_DEFINE1(s390_personality, unsigned int, personality)

  {

  	unsigned int ret = current->personality;

  	if (personality(current->personality) == PER_LINUX32 &&
  	    personality(personality) == PER_LINUX)
  		personality |= PER_LINUX32;

  
  	if (personality != 0xffffffff)
  		set_personality(personality);

  	if (personality(ret) == PER_LINUX32)
  		ret &= ~PER_LINUX32;

  
  	return ret;
  }

  
  SYSCALL_DEFINE0(ni_syscall)
  {
  	return -ENOSYS;
  }