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 #define MIN_MAP_ADDR    PAGE_SIZE       /* minimum fixed mmap address */
  27
  28 /*
  29  * memory mapping syscall
  30  */
  31 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  32                           unsigned long prot, unsigned long flags,
  33                           unsigned long fd, unsigned long pgoff)
  34 {
  35         struct file *file = NULL;
  36         long error = -EINVAL;
  37
  38         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  39
  40         if (flags & MAP_FIXED && addr < MIN_MAP_ADDR)
  41                 goto out;
  42
  43         error = -EBADF;
  44         if (!(flags & MAP_ANONYMOUS)) {
  45                 file = fget(fd);
  46                 if (!file)
  47                         goto out;
  48         }
  49
  50         down_write(&current->mm->mmap_sem);
  51         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  52         up_write(&current->mm->mmap_sem);
  53
  54         if (file)
  55                 fput(file);
  56 out:
  57         return error;
  58 }
  59
  60 asmlinkage long old_mmap(unsigned long addr, unsigned long len,
  61                          unsigned long prot, unsigned long flags,
  62                          unsigned long fd, unsigned long offset)
  63 {
  64         if (offset & ~PAGE_MASK)
  65                 return -EINVAL;
  66         return sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  67 }
  68
  69 struct sel_arg_struct {
  70         unsigned long n;
  71         fd_set *inp;
  72         fd_set *outp;
  73         fd_set *exp;
  74         struct timeval *tvp;
  75 };
  76
  77 asmlinkage int old_select(struct sel_arg_struct __user *arg)
  78 {
  79         struct sel_arg_struct a;
  80
  81         if (copy_from_user(&a, arg, sizeof(a)))
  82                 return -EFAULT;
  83         /* sys_select() does the appropriate kernel locking */
  84         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
  85 }
  86
  87 /*
  88  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  89  *
  90  * This is really horribly ugly.
  91  */
  92 asmlinkage long sys_ipc(uint call, int first, int second,
  93                         int third, void __user *ptr, long fifth)
  94 {
  95         int version, ret;
  96
  97         version = call >> 16; /* hack for backward compatibility */
  98         call &= 0xffff;
  99
 100         switch (call) {
 101         case SEMOP:
 102                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 103                                       second, NULL);
 104         case SEMTIMEDOP:
 105                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 106                                       second,
 107                                       (const struct timespec __user *)fifth);
 108         case SEMGET:
 109                 return sys_semget(first, second, third);
 110         case SEMCTL: {
 111                 union semun fourth;
 112                 if (!ptr)
 113                         return -EINVAL;
 114                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 115                         return -EFAULT;
 116                 return sys_semctl(first, second, third, fourth);
 117         }
 118
 119         case MSGSND:
 120                 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
 121                                   second, third);
 122         case MSGRCV:
 123                 switch (version) {
 124                 case 0: {
 125                         struct ipc_kludge tmp;
 126                         if (!ptr)
 127                                 return -EINVAL;
 128
 129                         if (copy_from_user(&tmp,
 130                                            (struct ipc_kludge __user *) ptr,
 131                                            sizeof(tmp)))
 132                                 return -EFAULT;
 133                         return sys_msgrcv(first, tmp.msgp, second,
 134                                           tmp.msgtyp, third);
 135                 }
 136                 default:
 137                         return sys_msgrcv(first,
 138                                           (struct msgbuf __user *) ptr,
 139                                            second, fifth, third);
 140                 }
 141         case MSGGET:
 142                 return sys_msgget((key_t) first, second);
 143         case MSGCTL:
 144                 return sys_msgctl(first, second,
 145                                    (struct msqid_ds __user *) ptr);
 146
 147         case SHMAT:
 148                 switch (version) {
 149                 default: {
 150                         ulong raddr;
 151                         ret = do_shmat(first, (char __user *) ptr, second,
 152                                        &raddr);
 153                         if (ret)
 154                                 return ret;
 155                         return put_user(raddr, (ulong *) third);
 156                 }
 157                 case 1: /* iBCS2 emulator entry point */
 158                         if (!segment_eq(get_fs(), get_ds()))
 159                                 return -EINVAL;
 160                         return do_shmat(first, (char __user *) ptr, second,
 161                                         (ulong *) third);
 162                 }
 163         case SHMDT:
 164                 return sys_shmdt((char __user *)ptr);
 165         case SHMGET:
 166                 return sys_shmget(first, second, third);
 167         case SHMCTL:
 168                 return sys_shmctl(first, second,
 169                                   (struct shmid_ds __user *) ptr);
 170         default:
 171                 return -EINVAL;
 172         }
 173 }