sound/core/rawmidi_compat.c

   1 /*
   2  *   32bit -> 64bit ioctl wrapper for raw MIDI 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 included from rawmidi.c */
  22
  23 #include <linux/compat.h>
  24
  25 struct snd_rawmidi_params32 {
  26         s32 stream;
  27         u32 buffer_size;
  28         u32 avail_min;
  29         unsigned int no_active_sensing; /* avoid bit-field */
  30         unsigned char reserved[16];
  31 } __attribute__((packed));
  32
  33 static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile,
  34                                            struct snd_rawmidi_params32 __user *src)
  35 {
  36         struct snd_rawmidi_params params;
  37         unsigned int val;
  38
  39         if (rfile->output == NULL)
  40                 return -EINVAL;
  41         if (get_user(params.stream, &src->stream) ||
  42             get_user(params.buffer_size, &src->buffer_size) ||
  43             get_user(params.avail_min, &src->avail_min) ||
  44             get_user(val, &src->no_active_sensing))
  45                 return -EFAULT;
  46         params.no_active_sensing = val;
  47         switch (params.stream) {
  48         case SNDRV_RAWMIDI_STREAM_OUTPUT:
  49                 return snd_rawmidi_output_params(rfile->output, &params);
  50         case SNDRV_RAWMIDI_STREAM_INPUT:
  51                 return snd_rawmidi_input_params(rfile->input, &params);
  52         }
  53         return -EINVAL;
  54 }
  55
  56 struct snd_rawmidi_status32 {
  57         s32 stream;
  58         struct compat_timespec tstamp;
  59         u32 avail;
  60         u32 xruns;
  61         unsigned char reserved[16];
  62 } __attribute__((packed));
  63
  64 static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
  65                                            struct snd_rawmidi_status32 __user *src)
  66 {
  67         int err;
  68         struct snd_rawmidi_status status;
  69
  70         if (rfile->output == NULL)
  71                 return -EINVAL;
  72         if (get_user(status.stream, &src->stream))
  73                 return -EFAULT;
  74
  75         switch (status.stream) {
  76         case SNDRV_RAWMIDI_STREAM_OUTPUT:
  77                 err = snd_rawmidi_output_status(rfile->output, &status);
  78                 break;
  79         case SNDRV_RAWMIDI_STREAM_INPUT:
  80                 err = snd_rawmidi_input_status(rfile->input, &status);
  81                 break;
  82         default:
  83                 return -EINVAL;
  84         }
  85         if (err < 0)
  86                 return err;
  87
  88         if (put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
  89             put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
  90             put_user(status.avail, &src->avail) ||
  91             put_user(status.xruns, &src->xruns))
  92                 return -EFAULT;
  93
  94         return 0;
  95 }
  96
  97 #ifdef CONFIG_X86_X32
  98 /* X32 ABI has 64bit timespec and 64bit alignment */
  99 struct snd_rawmidi_status_x32 {
 100         s32 stream;
 101         u32 rsvd; /* alignment */
 102         struct timespec tstamp;
 103         u32 avail;
 104         u32 xruns;
 105         unsigned char reserved[16];
 106 } __attribute__((packed));
 107
 108 #define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
 109
 110 static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
 111                                         struct snd_rawmidi_status_x32 __user *src)
 112 {
 113         int err;
 114         struct snd_rawmidi_status status;
 115
 116         if (rfile->output == NULL)
 117                 return -EINVAL;
 118         if (get_user(status.stream, &src->stream))
 119                 return -EFAULT;
 120
 121         switch (status.stream) {
 122         case SNDRV_RAWMIDI_STREAM_OUTPUT:
 123                 err = snd_rawmidi_output_status(rfile->output, &status);
 124                 break;
 125         case SNDRV_RAWMIDI_STREAM_INPUT:
 126                 err = snd_rawmidi_input_status(rfile->input, &status);
 127                 break;
 128         default:
 129                 return -EINVAL;
 130         }
 131         if (err < 0)
 132                 return err;
 133
 134         if (put_timespec(&status.tstamp, &src->tstamp) ||
 135             put_user(status.avail, &src->avail) ||
 136             put_user(status.xruns, &src->xruns))
 137                 return -EFAULT;
 138
 139         return 0;
 140 }
 141 #endif /* CONFIG_X86_X32 */
 142
 143 enum {
 144         SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
 145         SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
 146 #ifdef CONFIG_X86_X32
 147         SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32),
 148 #endif /* CONFIG_X86_X32 */
 149 };
 150
 151 static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 152 {
 153         struct snd_rawmidi_file *rfile;
 154         void __user *argp = compat_ptr(arg);
 155
 156         rfile = file->private_data;
 157         switch (cmd) {
 158         case SNDRV_RAWMIDI_IOCTL_PVERSION:
 159         case SNDRV_RAWMIDI_IOCTL_INFO:
 160         case SNDRV_RAWMIDI_IOCTL_DROP:
 161         case SNDRV_RAWMIDI_IOCTL_DRAIN:
 162                 return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp);
 163         case SNDRV_RAWMIDI_IOCTL_PARAMS32:
 164                 return snd_rawmidi_ioctl_params_compat(rfile, argp);
 165         case SNDRV_RAWMIDI_IOCTL_STATUS32:
 166                 return snd_rawmidi_ioctl_status_compat(rfile, argp);
 167 #ifdef CONFIG_X86_X32
 168         case SNDRV_RAWMIDI_IOCTL_STATUS_X32:
 169                 return snd_rawmidi_ioctl_status_x32(rfile, argp);
 170 #endif /* CONFIG_X86_X32 */
 171         }
 172         return -ENOIOCTLCMD;
 173 }