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  * sys_pipe() is the normal C calling standard for creating
  33  * a pipe. It's not the way Unix traditionally does this, though.
  34  */
  35 asmlinkage long sys_pipe(unsigned long __user *fildes)
  36 {
  37         int fd[2];
  38         int error;
  39
  40         error = do_pipe(fd);
  41         if (!error) {
  42                 if (copy_to_user(fildes, fd, 2 * sizeof(int)))
  43                         error = -EFAULT;
  44         }
  45         return error;
  46 }
  47
  48 /*
  49  * memory mapping syscall
  50  */
  51 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
  52                           unsigned long prot, unsigned long flags,
  53                           unsigned long fd, unsigned long pgoff)
  54 {
  55         struct file *file = NULL;
  56         long error = -EINVAL;
  57
  58         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  59
  60         if (flags & MAP_FIXED && addr < MIN_MAP_ADDR)
  61                 goto out;
  62
  63         error = -EBADF;
  64         if (!(flags & MAP_ANONYMOUS)) {
  65                 file = fget(fd);
  66                 if (!file)
  67                         goto out;
  68         }
  69
  70         down_write(&current->mm->mmap_sem);
  71         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  72         up_write(&current->mm->mmap_sem);
  73
  74         if (file)
  75                 fput(file);
  76 out:
  77         return error;
  78 }
  79
  80 asmlinkage long old_mmap(unsigned long addr, unsigned long len,
  81                          unsigned long prot, unsigned long flags,
  82                          unsigned long fd, unsigned long offset)
  83 {
  84         if (offset & ~PAGE_MASK)
  85                 return -EINVAL;
  86         return sys_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
  87 }
  88
  89 struct sel_arg_struct {
  90         unsigned long n;
  91         fd_set *inp;
  92         fd_set *outp;
  93         fd_set *exp;
  94         struct timeval *tvp;
  95 };
  96
  97 asmlinkage int old_select(struct sel_arg_struct __user *arg)
  98 {
  99         struct sel_arg_struct a;
 100
 101         if (copy_from_user(&a, arg, sizeof(a)))
 102                 return -EFAULT;
 103         /* sys_select() does the appropriate kernel locking */
 104         return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
 105 }
 106
 107 /*
 108  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 109  *
 110  * This is really horribly ugly.
 111  */
 112 asmlinkage long sys_ipc(uint call, int first, int second,
 113                         int third, void __user *ptr, long fifth)
 114 {
 115         int version, ret;
 116
 117         version = call >> 16; /* hack for backward compatibility */
 118         call &= 0xffff;
 119
 120         switch (call) {
 121         case SEMOP:
 122                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 123                                       second, NULL);
 124         case SEMTIMEDOP:
 125                 return sys_semtimedop(first, (struct sembuf __user *)ptr,
 126                                       second,
 127                                       (const struct timespec __user *)fifth);
 128         case SEMGET:
 129                 return sys_semget(first, second, third);
 130         case SEMCTL: {
 131                 union semun fourth;
 132                 if (!ptr)
 133                         return -EINVAL;
 134                 if (get_user(fourth.__pad, (void __user * __user *) ptr))
 135                         return -EFAULT;
 136                 return sys_semctl(first, second, third, fourth);
 137         }
 138
 139         case MSGSND:
 140                 return sys_msgsnd(first, (struct msgbuf __user *) ptr,
 141                                   second, third);
 142         case MSGRCV:
 143                 switch (version) {
 144                 case 0: {
 145                         struct ipc_kludge tmp;
 146                         if (!ptr)
 147                                 return -EINVAL;
 148
 149                         if (copy_from_user(&tmp,
 150                                            (struct ipc_kludge __user *) ptr,
 151                                            sizeof(tmp)))
 152                                 return -EFAULT;
 153                         return sys_msgrcv(first, tmp.msgp, second,
 154                                           tmp.msgtyp, third);
 155                 }
 156                 default:
 157                         return sys_msgrcv(first,
 158                                           (struct msgbuf __user *) ptr,
 159                                            second, fifth, third);
 160                 }
 161         case MSGGET:
 162                 return sys_msgget((key_t) first, second);
 163         case MSGCTL:
 164                 return sys_msgctl(first, second,
 165                                    (struct msqid_ds __user *) ptr);
 166
 167         case SHMAT:
 168                 switch (version) {
 169                 default: {
 170                         ulong raddr;
 171                         ret = do_shmat(first, (char __user *) ptr, second,
 172                                        &raddr);
 173                         if (ret)
 174                                 return ret;
 175                         return put_user(raddr, (ulong *) third);
 176                 }
 177                 case 1: /* iBCS2 emulator entry point */
 178                         if (!segment_eq(get_fs(), get_ds()))
 179                                 return -EINVAL;
 180                         return do_shmat(first, (char __user *) ptr, second,
 181                                         (ulong *) third);
 182                 }
 183         case SHMDT:
 184                 return sys_shmdt((char __user *)ptr);
 185         case SHMGET:
 186                 return sys_shmget(first, second, third);
 187         case SHMCTL:
 188                 return sys_shmctl(first, second,
 189                                   (struct shmid_ds __user *) ptr);
 190         default:
 191                 return -EINVAL;
 192         }
 193 }