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/sem.h>
  19 #include <linux/msg.h>
  20 #include <linux/shm.h>
  21 #include <linux/stat.h>
  22 #include <linux/mman.h>
  23 #include <linux/file.h>
  24 #include <linux/ipc.h>
  25
  26 #include <asm/uaccess.h>
  27 #include <asm/segment.h>
  28
  29 /* common code for old and new mmaps */
  30 static inline long
  31 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  32         unsigned long flags, unsigned long fd, unsigned long pgoff)
  33 {
  34         int error = -EBADF;
  35         struct file * file = NULL;
  36
  37         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
  38         if (!(flags & MAP_ANONYMOUS)) {
  39                 file = fget(fd);
  40                 if (!file)
  41                         goto out;
  42         }
  43
  44         down_write(&current->mm->mmap_sem);
  45         error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
  46         up_write(&current->mm->mmap_sem);
  47
  48         if (file)
  49                 fput(file);
  50 out:
  51         return error;
  52 }
  53
  54 asmlinkage unsigned long old_mmap(unsigned long __user *args)
  55 {
  56         unsigned long buffer[6];
  57         int err = -EFAULT;
  58
  59         if (copy_from_user(&buffer, args, sizeof(buffer)))
  60                 goto out;
  61
  62         err = -EINVAL;
  63         if (buffer[5] & ~PAGE_MASK) /* verify that offset is on page boundary */
  64                 goto out;
  65
  66         err = do_mmap2(buffer[0], buffer[1], buffer[2], buffer[3],
  67                        buffer[4], buffer[5] >> PAGE_SHIFT);
  68 out:
  69         return err;
  70 }
  71
  72 asmlinkage long
  73 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
  74           unsigned long flags, unsigned long fd, unsigned long pgoff)
  75 {
  76         return do_mmap2(addr, len, prot, flags, fd, pgoff);
  77 }
  78
  79 /*
  80  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
  81  *
  82  * This is really horribly ugly. (same as arch/i386)
  83  */
  84
  85 asmlinkage int sys_ipc (uint call, int first, int second,
  86                         int third, void __user *ptr, long fifth)
  87 {
  88         int version, ret;
  89
  90         version = call >> 16; /* hack for backward compatibility */
  91         call &= 0xffff;
  92
  93         switch (call) {
  94         case SEMOP:
  95                 return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
  96         case SEMTIMEDOP:
  97                 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
  98                                         (const struct timespec __user *)fifth);
  99
 100         case SEMGET:
 101                 return sys_semget (first, second, third);
 102         case SEMCTL: {
 103                 union semun fourth;
 104                 if (!ptr)
 105                         return -EINVAL;
 106                 if (get_user(fourth.__pad, (void * __user *) ptr))
 107                         return -EFAULT;
 108                 return sys_semctl (first, second, third, fourth);
 109         }
 110
 111         case MSGSND:
 112                 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
 113                                    second, third);
 114         case MSGRCV:
 115                 switch (version) {
 116                 case 0: {
 117                         struct ipc_kludge tmp;
 118                         if (!ptr)
 119                                 return -EINVAL;
 120
 121                         if (copy_from_user(&tmp,
 122                                            (struct ipc_kludge __user *) ptr,
 123                                            sizeof (tmp)))
 124                                 return -EFAULT;
 125                         return sys_msgrcv (first, tmp.msgp, second,
 126                                            tmp.msgtyp, third);
 127                 }
 128                 default:
 129                         return sys_msgrcv (first,
 130                                            (struct msgbuf __user *) ptr,
 131                                            second, fifth, third);
 132                 }
 133         case MSGGET:
 134                 return sys_msgget ((key_t) first, second);
 135         case MSGCTL:
 136                 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
 137
 138         case SHMAT: {
 139                 ulong raddr;
 140                 ret = do_shmat (first, (char __user *) ptr, second, &raddr);
 141                 if (ret)
 142                         return ret;
 143                 return put_user (raddr, (ulong __user *) third);
 144         }
 145         case SHMDT:
 146                 return sys_shmdt ((char __user *)ptr);
 147         case SHMGET:
 148                 return sys_shmget (first, second, third);
 149         case SHMCTL:
 150                 return sys_shmctl (first, second,
 151                                    (struct shmid_ds __user *) ptr);
 152         default:
 153                 return -ENOSYS;
 154         }
 155 }