diff options
Diffstat (limited to 'sound/core/rawmidi_compat.c')
| -rw-r--r-- | sound/core/rawmidi_compat.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/sound/core/rawmidi_compat.c b/sound/core/rawmidi_compat.c new file mode 100644 index 000000000..e30e30ba6 --- /dev/null +++ b/sound/core/rawmidi_compat.c @@ -0,0 +1,178 @@ +/* + * 32bit -> 64bit ioctl wrapper for raw MIDI API + * 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 included from rawmidi.c */ + +#include <linux/compat.h> + +struct snd_rawmidi_params32 { + s32 stream; + u32 buffer_size; + u32 avail_min; + unsigned int no_active_sensing; /* avoid bit-field */ + unsigned char reserved[16]; +} __attribute__((packed)); + +static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile, + struct snd_rawmidi_params32 __user *src) +{ + struct snd_rawmidi_params params; + unsigned int val; + + if (get_user(params.stream, &src->stream) || + get_user(params.buffer_size, &src->buffer_size) || + get_user(params.avail_min, &src->avail_min) || + get_user(val, &src->no_active_sensing)) + return -EFAULT; + params.no_active_sensing = val; + switch (params.stream) { + case SNDRV_RAWMIDI_STREAM_OUTPUT: + if (!rfile->output) + return -EINVAL; + return snd_rawmidi_output_params(rfile->output, ¶ms); + case SNDRV_RAWMIDI_STREAM_INPUT: + if (!rfile->input) + return -EINVAL; + return snd_rawmidi_input_params(rfile->input, ¶ms); + } + return -EINVAL; +} + +struct snd_rawmidi_status32 { + s32 stream; + struct compat_timespec tstamp; + u32 avail; + u32 xruns; + unsigned char reserved[16]; +} __attribute__((packed)); + +static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile, + struct snd_rawmidi_status32 __user *src) +{ + int err; + struct snd_rawmidi_status status; + + if (get_user(status.stream, &src->stream)) + return -EFAULT; + + switch (status.stream) { + case SNDRV_RAWMIDI_STREAM_OUTPUT: + if (!rfile->output) + return -EINVAL; + err = snd_rawmidi_output_status(rfile->output, &status); + break; + case SNDRV_RAWMIDI_STREAM_INPUT: + if (!rfile->input) + return -EINVAL; + err = snd_rawmidi_input_status(rfile->input, &status); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + if (compat_put_timespec(&status.tstamp, &src->tstamp) || + put_user(status.avail, &src->avail) || + put_user(status.xruns, &src->xruns)) + return -EFAULT; + + return 0; +} + +#ifdef CONFIG_X86_X32 +/* X32 ABI has 64bit timespec and 64bit alignment */ +struct snd_rawmidi_status_x32 { + s32 stream; + u32 rsvd; /* alignment */ + struct timespec tstamp; + u32 avail; + u32 xruns; + unsigned char reserved[16]; +} __attribute__((packed)); + +#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst)) + +static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile, + struct snd_rawmidi_status_x32 __user *src) +{ + int err; + struct snd_rawmidi_status status; + + if (get_user(status.stream, &src->stream)) + return -EFAULT; + + switch (status.stream) { + case SNDRV_RAWMIDI_STREAM_OUTPUT: + if (!rfile->output) + return -EINVAL; + err = snd_rawmidi_output_status(rfile->output, &status); + break; + case SNDRV_RAWMIDI_STREAM_INPUT: + if (!rfile->input) + return -EINVAL; + err = snd_rawmidi_input_status(rfile->input, &status); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + if (put_timespec(&status.tstamp, &src->tstamp) || + put_user(status.avail, &src->avail) || + put_user(status.xruns, &src->xruns)) + return -EFAULT; + + return 0; +} +#endif /* CONFIG_X86_X32 */ + +enum { + SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32), + SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32), +#ifdef CONFIG_X86_X32 + SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32), +#endif /* CONFIG_X86_X32 */ +}; + +static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct snd_rawmidi_file *rfile; + void __user *argp = compat_ptr(arg); + + rfile = file->private_data; + switch (cmd) { + case SNDRV_RAWMIDI_IOCTL_PVERSION: + case SNDRV_RAWMIDI_IOCTL_INFO: + case SNDRV_RAWMIDI_IOCTL_DROP: + case SNDRV_RAWMIDI_IOCTL_DRAIN: + return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp); + case SNDRV_RAWMIDI_IOCTL_PARAMS32: + return snd_rawmidi_ioctl_params_compat(rfile, argp); + case SNDRV_RAWMIDI_IOCTL_STATUS32: + return snd_rawmidi_ioctl_status_compat(rfile, argp); +#ifdef CONFIG_X86_X32 + case SNDRV_RAWMIDI_IOCTL_STATUS_X32: + return snd_rawmidi_ioctl_status_x32(rfile, argp); +#endif /* CONFIG_X86_X32 */ + } + return -ENOIOCTLCMD; +} |