Root/sound/core/hwdep_compat.c

1/*
2 * 32bit -> 64bit ioctl wrapper for hwdep API
3 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
21/* This file is included from hwdep.c */
22
23#include <linux/compat.h>
24
25struct snd_hwdep_dsp_image32 {
26    u32 index;
27    unsigned char name[64];
28    u32 image; /* pointer */
29    u32 length;
30    u32 driver_data;
31} /* don't set packed attribute here */;
32
33static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
34                     struct snd_hwdep_dsp_image32 __user *src)
35{
36    struct snd_hwdep_dsp_image __user *dst;
37    compat_caddr_t ptr;
38    u32 val;
39
40    dst = compat_alloc_user_space(sizeof(*dst));
41
42    /* index and name */
43    if (copy_in_user(dst, src, 4 + 64))
44        return -EFAULT;
45    if (get_user(ptr, &src->image) ||
46        put_user(compat_ptr(ptr), &dst->image))
47        return -EFAULT;
48    if (get_user(val, &src->length) ||
49        put_user(val, &dst->length))
50        return -EFAULT;
51    if (get_user(val, &src->driver_data) ||
52        put_user(val, &dst->driver_data))
53        return -EFAULT;
54
55    return snd_hwdep_dsp_load(hw, dst);
56}
57
58enum {
59    SNDRV_HWDEP_IOCTL_DSP_LOAD32 = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
60};
61
62static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
63                   unsigned long arg)
64{
65    struct snd_hwdep *hw = file->private_data;
66    void __user *argp = compat_ptr(arg);
67    switch (cmd) {
68    case SNDRV_HWDEP_IOCTL_PVERSION:
69    case SNDRV_HWDEP_IOCTL_INFO:
70    case SNDRV_HWDEP_IOCTL_DSP_STATUS:
71        return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
72    case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
73        return snd_hwdep_dsp_load_compat(hw, argp);
74    }
75    if (hw->ops.ioctl_compat)
76        return hw->ops.ioctl_compat(hw, file, cmd, arg);
77    return -ENOIOCTLCMD;
78}
79

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