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ioctl32_old.h

/*
 *   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 compat_ptr(x)
 * macro to a valid 64-bit pointer which is accessible via copy_from/to_user.
 *
 */

#ifndef __ALSA_IOCTL32_H
#define __ALSA_IOCTL32_H

#include <linux/compat.h>

#define COPY(x)  (dst->x = src->x)
#define CPTR(x)    (dst->x = compat_ptr(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 inline 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 __user *)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 __user *)arg, &data32, sizeof(data32)))\
                  return -EFAULT;\
      }\
      return 0;\
}

#define DEFINE_ALSA_IOCTL_BIG(type) \
static inline 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 __user *)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 __user *)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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