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