arch/mn10300/kernel/sys_mn10300.c

   1 /* MN10300 Weird system calls
   2  *
   3  * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
   4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11 #include <linux/errno.h>
  12 #include <linux/sched.h>
  13 #include <linux/syscalls.h>
  14 #include <linux/mm.h>
  15 #include <linux/smp.h>
  16 #include <linux/sem.h>
  17 #include <linux/msg.h>
  18 #include <linux/shm.h>
  19 #include <linux/stat.h>
  20 #include <linux/mman.h>
  21 #include <linux/file.h>
  22 #include <linux/tty.h>
  23
  24 #include <asm/uaccess.h>
  25
  26 /*
  27  * memory mapping syscall
  28  */
  29 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  30                           unsigned long prot, unsigned long flags,
  31                           unsigned long fd, unsigned long pgoff)
  32 {
  33         struct file *file = NULL;
  34         long error = -EINVAL;
  35
  36         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  37
  38         error = -EBADF;
  39         if (!(flags & MAP_ANONYMOUS)) {
  40                 file = fget(fd);
  41                 if (!file)
  42                         goto out;
  43         }
  44
  45         down_write(&current->mm->mmap_sem);
  46         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  47         up_write(&current->mm->mmap_sem);
  48
  49         if (file)
  50                 fput(file);
  51 out:
  52         return error;
  53 }
  54
  55 asmlinkage long old_mmap(unsigned long addr, unsigned long len,
  56                          unsigned long prot, unsigned long flags,
  57                          unsigned long fd, unsigned long offset)
  58 {
  59         if (offset & ~PAGE_MASK)
  60                 return -EINVAL;
  61         return sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  62 }
  63
  64 struct sel_arg_struct {
  65         unsigned long n;
  66         fd_set *inp;
  67         fd_set *outp;
  68         fd_set *exp;
  69         struct timeval *tvp;
  70 };
  71
  72 asmlinkage int old_select(struct sel_arg_struct __user *arg)
  73 {
  74         struct sel_arg_struct a;
  75
  76         if (copy_from_user(&a, arg, sizeof(a)))
  77                 return -EFAULT;
  78         /* sys_select() does the appropriate kernel locking */
  79         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
  80 }
  81
  82 /*
  83  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  84  *
  85  * This is really horribly ugly.
  86  */
  87 asmlinkage long sys_ipc(uint call, int first, int second,
  88                         int third, void __user *ptr, long fifth)
  89 {
  90         int version, ret;
  91
  92         version = call >> 16; /* hack for backward compatibility */
  93         call &= 0xffff;
  94
  95         switch (call) {
  96         case SEMOP:
  97                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
  98                                       second, NULL);
  99         case SEMTIMEDOP:
 100                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 101                                       second,
 102                                       (const struct timespec __user *)fifth);
 103         case SEMGET:
 104                 return sys_semget(first, second, third);
 105         case SEMCTL: {
 106                 union semun fourth;
 107                 if (!ptr)
 108                         return -EINVAL;
 109                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 110                         return -EFAULT;
 111                 return sys_semctl(first, second, third, fourth);
 112         }
 113
 114         case MSGSND:
 115                 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
 116                                   second, third);
 117         case MSGRCV:
 118                 switch (version) {
 119                 case 0: {
 120                         struct ipc_kludge tmp;
 121                         if (!ptr)
 122                                 return -EINVAL;
 123
 124                         if (copy_from_user(&tmp,
 125                                            (struct ipc_kludge __user *) ptr,
 126                                            sizeof(tmp)))
 127                                 return -EFAULT;
 128                         return sys_msgrcv(first, tmp.msgp, second,
 129                                           tmp.msgtyp, third);
 130                 }
 131                 default:
 132                         return sys_msgrcv(first,
 133                                           (struct msgbuf __user *) ptr,
 134                                            second, fifth, third);
 135                 }
 136         case MSGGET:
 137                 return sys_msgget((key_t) first, second);
 138         case MSGCTL:
 139                 return sys_msgctl(first, second,
 140                                    (struct msqid_ds __user *) ptr);
 141
 142         case SHMAT:
 143                 switch (version) {
 144                 default: {
 145                         ulong raddr;
 146                         ret = do_shmat(first, (char __user *) ptr, second,
 147                                        &raddr);
 148                         if (ret)
 149                                 return ret;
 150                         return put_user(raddr, (ulong *) third);
 151                 }
 152                 case 1: /* iBCS2 emulator entry point */
 153                         if (!segment_eq(get_fs(), get_ds()))
 154                                 return -EINVAL;
 155                         return do_shmat(first, (char __user *) ptr, second,
 156                                         (ulong *) third);
 157                 }
 158         case SHMDT:
 159                 return sys_shmdt((char __user *)ptr);
 160         case SHMGET:
 161                 return sys_shmget(first, second, third);
 162         case SHMCTL:
 163                 return sys_shmctl(first, second,
 164                                   (struct shmid_ds __user *) ptr);
 165         default:
 166                 return -EINVAL;
 167         }
 168 }