arch/cris/kernel/sys_cris.c

   1 /* $Id: sys_cris.c,v 1.6 2004/03/11 11:38:40 starvik Exp $
   2  *
   3  * linux/arch/cris/kernel/sys_cris.c
   4  *
   5  * This file contains various random system calls that
   6  * have a non-standard calling sequence on some platforms.
   7  * Since we don't have to do any backwards compatibility, our
   8  * versions are done in the most "normal" way possible.
   9  *
  10  */
  11
  12 #include <linux/errno.h>
  13 #include <linux/sched.h>
  14 #include <linux/syscalls.h>
  15 #include <linux/mm.h>
  16 #include <linux/fs.h>
  17 #include <linux/smp.h>
  18 #include <linux/smp_lock.h>
  19 #include <linux/sem.h>
  20 #include <linux/msg.h>
  21 #include <linux/shm.h>
  22 #include <linux/stat.h>
  23 #include <linux/mman.h>
  24 #include <linux/file.h>
  25 #include <linux/ipc.h>
  26
  27 #include <asm/uaccess.h>
  28 #include <asm/segment.h>
  29
  30 /* common code for old and new mmaps */
  31 static inline long
  32 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  33         unsigned long flags, unsigned long fd, unsigned long pgoff)
  34 {
  35         int error = -EBADF;
  36         struct file * file = NULL;
  37
  38         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  39         if (!(flags & MAP_ANONYMOUS)) {
  40                 file = fget(fd);
  41                 if (!file)
  42                         goto out;
  43         }
  44
  45         down_write(&current->mm->mmap_sem);
  46         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  47         up_write(&current->mm->mmap_sem);
  48
  49         if (file)
  50                 fput(file);
  51 out:
  52         return error;
  53 }
  54
  55 asmlinkage unsigned long old_mmap(unsigned long __user *args)
  56 {
  57         unsigned long buffer[6];
  58         int err = -EFAULT;
  59
  60         if (copy_from_user(&buffer, args, sizeof(buffer)))
  61                 goto out;
  62
  63         err = -EINVAL;
  64         if (buffer[5] & ~PAGE_MASK) /* verify that offset is on page boundary */
  65                 goto out;
  66
  67         err = do_mmap2(buffer[0], buffer[1], buffer[2], buffer[3],
  68                        buffer[4], buffer[5] >> PAGE_SHIFT);
  69 out:
  70         return err;
  71 }
  72
  73 asmlinkage long
  74 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  75           unsigned long flags, unsigned long fd, unsigned long pgoff)
  76 {
  77         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  78 }
  79
  80 /*
  81  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  82  *
  83  * This is really horribly ugly. (same as arch/i386)
  84  */
  85
  86 asmlinkage int sys_ipc (uint call, int first, int second,
  87                         int third, void __user *ptr, long fifth)
  88 {
  89         int version, ret;
  90
  91         version = call >> 16; /* hack for backward compatibility */
  92         call &= 0xffff;
  93
  94         switch (call) {
  95         case SEMOP:
  96                 return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
  97         case SEMTIMEDOP:
  98                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
  99                                         (const struct timespec __user *)fifth);
 100
 101         case SEMGET:
 102                 return sys_semget (first, second, third);
 103         case SEMCTL: {
 104                 union semun fourth;
 105                 if (!ptr)
 106                         return -EINVAL;
 107                 if (get_user(fourth.__pad, (void * __user *) ptr))
 108                         return -EFAULT;
 109                 return sys_semctl (first, second, third, fourth);
 110         }
 111
 112         case MSGSND:
 113                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 114                                    second, third);
 115         case MSGRCV:
 116                 switch (version) {
 117                 case 0: {
 118                         struct ipc_kludge tmp;
 119                         if (!ptr)
 120                                 return -EINVAL;
 121
 122                         if (copy_from_user(&tmp,
 123                                            (struct ipc_kludge __user *) ptr,
 124                                            sizeof (tmp)))
 125                                 return -EFAULT;
 126                         return sys_msgrcv (first, tmp.msgp, second,
 127                                            tmp.msgtyp, third);
 128                 }
 129                 default:
 130                         return sys_msgrcv (first,
 131                                            (struct msgbuf __user *) ptr,
 132                                            second, fifth, third);
 133                 }
 134         case MSGGET:
 135                 return sys_msgget ((key_t) first, second);
 136         case MSGCTL:
 137                 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 138
 139         case SHMAT: {
 140                 ulong raddr;
 141                 ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 142                 if (ret)
 143                         return ret;
 144                 return put_user (raddr, (ulong __user *) third);
 145         }
 146         case SHMDT:
 147                 return sys_shmdt ((char __user *)ptr);
 148         case SHMGET:
 149                 return sys_shmget (first, second, third);
 150         case SHMCTL:
 151                 return sys_shmctl (first, second,
 152                                    (struct shmid_ds __user *) ptr);
 153         default:
 154                 return -ENOSYS;
 155         }
 156 }