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/smp_lock.h>
  17 #include <linux/sem.h>
  18 #include <linux/msg.h>
  19 #include <linux/shm.h>
  20 #include <linux/stat.h>
  21 #include <linux/mman.h>
  22 #include <linux/file.h>
  23 #include <linux/utsname.h>
  24 #include <linux/syscalls.h>
  25 #include <linux/tty.h>
  26
  27 #include <asm/uaccess.h>
  28
  29 #define MIN_MAP_ADDR    PAGE_SIZE       /* minimum fixed mmap address */
  30
  31 /*
  32  * memory mapping syscall
  33  */
  34 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  35                           unsigned long prot, unsigned long flags,
  36                           unsigned long fd, unsigned long pgoff)
  37 {
  38         struct file *file = NULL;
  39         long error = -EINVAL;
  40
  41         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  42
  43         if (flags & MAP_FIXED && addr < MIN_MAP_ADDR)
  44                 goto out;
  45
  46         error = -EBADF;
  47         if (!(flags & MAP_ANONYMOUS)) {
  48                 file = fget(fd);
  49                 if (!file)
  50                         goto out;
  51         }
  52
  53         down_write(&current->mm->mmap_sem);
  54         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  55         up_write(&current->mm->mmap_sem);
  56
  57         if (file)
  58                 fput(file);
  59 out:
  60         return error;
  61 }
  62
  63 asmlinkage long old_mmap(unsigned long addr, unsigned long len,
  64                          unsigned long prot, unsigned long flags,
  65                          unsigned long fd, unsigned long offset)
  66 {
  67         if (offset & ~PAGE_MASK)
  68                 return -EINVAL;
  69         return sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  70 }
  71
  72 struct sel_arg_struct {
  73         unsigned long n;
  74         fd_set *inp;
  75         fd_set *outp;
  76         fd_set *exp;
  77         struct timeval *tvp;
  78 };
  79
  80 asmlinkage int old_select(struct sel_arg_struct __user *arg)
  81 {
  82         struct sel_arg_struct a;
  83
  84         if (copy_from_user(&a, arg, sizeof(a)))
  85                 return -EFAULT;
  86         /* sys_select() does the appropriate kernel locking */
  87         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
  88 }
  89
  90 /*
  91  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  92  *
  93  * This is really horribly ugly.
  94  */
  95 asmlinkage long sys_ipc(uint call, int first, int second,
  96                         int third, void __user *ptr, long fifth)
  97 {
  98         int version, ret;
  99
 100         version = call >> 16; /* hack for backward compatibility */
 101         call &= 0xffff;
 102
 103         switch (call) {
 104         case SEMOP:
 105                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 106                                       second, NULL);
 107         case SEMTIMEDOP:
 108                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 109                                       second,
 110                                       (const struct timespec __user *)fifth);
 111         case SEMGET:
 112                 return sys_semget(first, second, third);
 113         case SEMCTL: {
 114                 union semun fourth;
 115                 if (!ptr)
 116                         return -EINVAL;
 117                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 118                         return -EFAULT;
 119                 return sys_semctl(first, second, third, fourth);
 120         }
 121
 122         case MSGSND:
 123                 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
 124                                   second, third);
 125         case MSGRCV:
 126                 switch (version) {
 127                 case 0: {
 128                         struct ipc_kludge tmp;
 129                         if (!ptr)
 130                                 return -EINVAL;
 131
 132                         if (copy_from_user(&tmp,
 133                                            (struct ipc_kludge __user *) ptr,
 134                                            sizeof(tmp)))
 135                                 return -EFAULT;
 136                         return sys_msgrcv(first, tmp.msgp, second,
 137                                           tmp.msgtyp, third);
 138                 }
 139                 default:
 140                         return sys_msgrcv(first,
 141                                           (struct msgbuf __user *) ptr,
 142                                            second, fifth, third);
 143                 }
 144         case MSGGET:
 145                 return sys_msgget((key_t) first, second);
 146         case MSGCTL:
 147                 return sys_msgctl(first, second,
 148                                    (struct msqid_ds __user *) ptr);
 149
 150         case SHMAT:
 151                 switch (version) {
 152                 default: {
 153                         ulong raddr;
 154                         ret = do_shmat(first, (char __user *) ptr, second,
 155                                        &raddr);
 156                         if (ret)
 157                                 return ret;
 158                         return put_user(raddr, (ulong *) third);
 159                 }
 160                 case 1: /* iBCS2 emulator entry point */
 161                         if (!segment_eq(get_fs(), get_ds()))
 162                                 return -EINVAL;
 163                         return do_shmat(first, (char __user *) ptr, second,
 164                                         (ulong *) third);
 165                 }
 166         case SHMDT:
 167                 return sys_shmdt((char __user *)ptr);
 168         case SHMGET:
 169                 return sys_shmget(first, second, third);
 170         case SHMCTL:
 171                 return sys_shmctl(first, second,
 172                                   (struct shmid_ds __user *) ptr);
 173         default:
 174                 return -EINVAL;
 175         }
 176 }