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
snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file * rfile,struct snd_rawmidi_params32 __user * src)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, ¶ms);
50 case SNDRV_RAWMIDI_STREAM_INPUT:
51 return snd_rawmidi_input_params(rfile->input, ¶ms);
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
snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status32 __user * src)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
snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file * rfile,struct snd_rawmidi_status_x32 __user * src)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
snd_rawmidi_ioctl_compat(struct file * file,unsigned int cmd,unsigned long arg)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 }
174