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