LXR linux/arch/s390/kernel/sys

   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}
 103