arch/sparc64/kernel/ioctl32.c

   1 /* $Id: ioctl32.c,v 1.3 1997/05/27 19:30:13 jj Exp $
   2  * ioctl32.c: Conversion between 32bit and 64bit native ioctls.
   3  *
   4  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  *
   6  * These routines maintain argument size conversion between 32bit and 64bit
   7  * ioctls.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/smp.h>
  13 #include <linux/smp_lock.h>
  14 #include <linux/ioctl.h>
  15
  16 #include <asm/types.h>
  17 #include <asm/uaccess.h>
  18
  19 /* As gcc will warn about casting u32 to some ptr, we have to cast it to unsigned long first, and that's what is A() for.
  20  * You just do (void *)A(x), instead of having to type (void *)((unsigned long)x) or instead of just (void *)x, which will
  21  * produce warnings */
  22 #define A(x) ((unsigned long)x)
  23
  24 extern asmlinkage int sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg);
  25
  26 asmlinkage int sys32_ioctl(unsigned int fd, unsigned int cmd, u32 arg)
  27 {
  28         struct file * filp;
  29         int error = -EBADF;
  30
  31         lock_kernel();
  32         if (fd >= NR_OPEN || !(filp = current->files->fd[fd]))
  33                 goto out;
  34         if (!filp->f_op || !filp->f_op->ioctl) {
  35                 error = sys_ioctl (fd, cmd, (unsigned long)arg);
  36                 goto out;
  37         }
  38         error = 0;
  39         switch (cmd) {
  40                 default:
  41                         error = sys_ioctl (fd, cmd, (unsigned long)arg);
  42                         goto out;
  43         }
  44 out:
  45         if (error == -EINVAL) {
  46                 printk ("sys32_ioctl on %016lx's %08x returns EINVAL\n", filp->f_op ? (long)filp->f_op->ioctl : 0UL, cmd);
  47         }
  48         unlock_kernel();
  49         return error;
  50 }