hwdep_compat.c

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/*
 *   32bit -> 64bit ioctl wrapper for hwdep API
 *   Copyright (c) by Takashi Iwai <[email protected]>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

/* This file is included from hwdep.c */

#include <linux/compat.h>

struct snd_hwdep_dsp_image32 {
    u32 index;
    unsigned char name[64];
    u32 image;  /* pointer */
    u32 length;
    u32 driver_data;
} /* don't set packed attribute here */;

static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
                     struct snd_hwdep_dsp_image32 __user *src)
{
    struct snd_hwdep_dsp_image __user *dst;
    compat_caddr_t ptr;
    u32 val;

    dst = compat_alloc_user_space(sizeof(*dst));

    /* index and name */
    if (copy_in_user(dst, src, 4 + 64))
        return -EFAULT;
    if (get_user(ptr, &src->image) ||
        put_user(compat_ptr(ptr), &dst->image))
        return -EFAULT;
    if (get_user(val, &src->length) ||
        put_user(val, &dst->length))
        return -EFAULT;
    if (get_user(val, &src->driver_data) ||
        put_user(val, &dst->driver_data))
        return -EFAULT;

    return snd_hwdep_dsp_load(hw, dst);
}

enum {
    SNDRV_HWDEP_IOCTL_DSP_LOAD32   = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
};

static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
                   unsigned long arg)
{
    struct snd_hwdep *hw = file->private_data;
    void __user *argp = compat_ptr(arg);
    switch (cmd) {
    case SNDRV_HWDEP_IOCTL_PVERSION:
    case SNDRV_HWDEP_IOCTL_INFO:
    case SNDRV_HWDEP_IOCTL_DSP_STATUS:
        return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
    case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
        return snd_hwdep_dsp_load_compat(hw, argp);
    }
    if (hw->ops.ioctl_compat)
        return hw->ops.ioctl_compat(hw, file, cmd, arg);
    return -ENOIOCTLCMD;
}