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* 32bit -> 64bit ioctl helpers
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
*
* 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 registers the converters from 32-bit ioctls to 64-bit ones.
* The converter assumes that a 32-bit user-pointer can be casted by A(x)
* macro to a valid 64-bit pointer which is accessible via copy_from/to_user.
*
*/
#ifndef __ALSA_IOCTL32_H
#define __ALSA_IOCTL32_H
#ifndef A
#ifdef CONFIG_PPC64
#include <asm/ppc32.h>
#else
/* x86-64, sparc64 */
#define A(__x) ((void *)(unsigned long)(__x))
#endif
#endif
#define TO_PTR(x) A(x)
#define COPY(x) (dst->x = src->x)
#define CPTR(x) (dst->x = (typeof(dst->x))A(src->x))
#define convert_from_32(type, dstp, srcp)\
{\
struct sndrv_##type *dst = dstp;\
struct sndrv_##type##32 *src = srcp;\
CVT_##sndrv_##type();\
}
#define convert_to_32(type, dstp, srcp)\
{\
struct sndrv_##type *src = srcp;\
struct sndrv_##type##32 *dst = dstp;\
CVT_##sndrv_##type();\
}
#define DEFINE_ALSA_IOCTL(type) \
static int _snd_ioctl32_##type(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)\
{\
struct sndrv_##type##32 data32;\
struct sndrv_##type data;\
mm_segment_t oldseg;\
int err;\
if (copy_from_user(&data32, (void*)arg, sizeof(data32)))\
return -EFAULT;\
memset(&data, 0, sizeof(data));\
convert_from_32(type, &data, &data32);\
oldseg = get_fs();\
set_fs(KERNEL_DS);\
err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)&data);\
set_fs(oldseg);\
if (err < 0) \
return err;\
if (native_ctl & (_IOC_READ << _IOC_DIRSHIFT)) {\
convert_to_32(type, &data32, &data);\
if (copy_to_user((void*)arg, &data32, sizeof(data32)))\
return -EFAULT;\
}\
return 0;\
}
#define DEFINE_ALSA_IOCTL_BIG(type) \
static int _snd_ioctl32_##type(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)\
{\
struct sndrv_##type##32 *data32;\
struct sndrv_##type *data;\
mm_segment_t oldseg;\
int err;\
data32 = kmalloc(sizeof(*data32), GFP_KERNEL); \
data = kmalloc(sizeof(*data), GFP_KERNEL); \
if (data32 == NULL || data == NULL) { \
err = -ENOMEM; \
goto __end; \
}\
if (copy_from_user(data32, (void*)arg, sizeof(*data32))) { \
err = -EFAULT; \
goto __end; \
}\
memset(data, 0, sizeof(*data));\
convert_from_32(type, data, data32);\
oldseg = get_fs();\
set_fs(KERNEL_DS);\
err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)data);\
set_fs(oldseg);\
if (err < 0) \
goto __end;\
err = 0;\
if (native_ctl & (_IOC_READ << _IOC_DIRSHIFT)) {\
convert_to_32(type, data32, data);\
if (copy_to_user((void*)arg, data32, sizeof(*data32)))\
err = -EFAULT;\
}\
__end:\
if (data)\
kfree(data);\
if (data32)\
kfree(data32);\
return err;\
}
#define DEFINE_ALSA_IOCTL_ENTRY(name,type,native_ctl) \
static int snd_ioctl32_##name(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file) {\
return _snd_ioctl32_##type(fd, cmd, arg, file, native_ctl);\
}
#define MAP_COMPAT(ctl) { ctl, snd_ioctl32_compat }
struct ioctl32_mapper {
unsigned int cmd;
int (*handler)(unsigned int, unsigned int, unsigned long, struct file * filp);
int registered;
};
int snd_ioctl32_compat(unsigned int, unsigned int, unsigned long, struct file *);
int snd_ioctl32_register(struct ioctl32_mapper *mappers);
void snd_ioctl32_unregister(struct ioctl32_mapper *mappers);
#endif /* __ALSA_IOCTL32_H */
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