2 * 32bit -> 64bit ioctl helpers
3 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
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.
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.
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
20 * This file registers the converters from 32-bit ioctls to 64-bit ones.
21 * The converter assumes that a 32-bit user-pointer can be casted by compat_ptr(x)
22 * macro to a valid 64-bit pointer which is accessible via copy_from/to_user.
26 #ifndef __ALSA_IOCTL32_H
27 #define __ALSA_IOCTL32_H
29 #include <linux/compat.h>
33 if (copy_in_user(&dst->x, &src->x, sizeof(dst->x))) \
37 #define COPY_ARRAY(x) \
39 if (copy_in_user(dst->x, src->x, sizeof(dst->x))) \
45 __typeof__(src->x) __val_tmp; \
46 if (get_user(__val_tmp, &src->x) || \
47 put_user(__val_tmp, &dst->x))\
51 #define convert_from_32(type, dstp, srcp)\
53 struct sndrv_##type __user *dst = dstp;\
54 struct sndrv_##type##32 __user *src = srcp;\
55 CVT_##sndrv_##type();\
58 #define convert_to_32(type, dstp, srcp)\
60 struct sndrv_##type __user *src = srcp;\
61 struct sndrv_##type##32 __user *dst = dstp;\
62 CVT_##sndrv_##type();\
66 #define DEFINE_ALSA_IOCTL(type) \
67 static inline int _snd_ioctl32_##type(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)\
69 struct sndrv_##type##32 __user *data32;\
70 struct sndrv_##type __user *data;\
72 data32 = compat_ptr(arg);\
73 data = compat_alloc_user_space(sizeof(*data));\
74 convert_from_32(type, data, data32);\
75 err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)data);\
78 if (native_ctl & (_IOC_READ << _IOC_DIRSHIFT)) {\
79 convert_to_32(type, data32, data);\
84 #define DEFINE_ALSA_IOCTL_ENTRY(name,type,native_ctl) \
85 static int snd_ioctl32_##name(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file) {\
86 return _snd_ioctl32_##type(fd, cmd, arg, file, native_ctl);\
89 #define MAP_COMPAT(ctl) { ctl, snd_ioctl32_compat }
91 struct ioctl32_mapper {
93 int (*handler)(unsigned int, unsigned int, unsigned long, struct file * filp);
97 int snd_ioctl32_compat(unsigned int, unsigned int, unsigned long, struct file *);
99 int snd_ioctl32_register(struct ioctl32_mapper *mappers);
100 void snd_ioctl32_unregister(struct ioctl32_mapper *mappers);
102 #endif /* __ALSA_IOCTL32_H */