10 #define alignof(t) offsetof(struct { char c; t x; }, x)
16 struct ioctl_compat_map
{
18 unsigned char old_size
, dir
, force_align
, noffs
;
19 unsigned char offsets
[8];
22 #define NINTH(a,b,c,d,e,f,g,h,i,...) i
23 #define COUNT(...) NINTH(__VA_ARGS__,8,7,6,5,4,3,2,1,0)
24 #define OFFS(...) COUNT(__VA_ARGS__), { __VA_ARGS__ }
26 /* yields a type for a struct with original size n, with a misaligned
27 * timeval/timespec expanded from 32- to 64-bit. for use with ioctl
28 * number producing macros; only size of result is meaningful. */
29 #define new_misaligned(n) struct { int i; time_t t; char c[(n)-4]; }
31 static const struct ioctl_compat_map compat_map
[] = {
32 { SIOCGSTAMP
, SIOCGSTAMP_OLD
, 8, R
, 0, OFFS(0, 4) },
33 { SIOCGSTAMPNS
, SIOCGSTAMPNS_OLD
, 8, R
, 0, OFFS(0, 4) },
35 /* SNDRV_TIMER_IOCTL_STATUS */
36 { _IOR('T', 0x14, char[96]), _IOR('T', 0x14, 88), 88, R
, 0, OFFS(0,4) },
38 /* SNDRV_PCM_IOCTL_STATUS[_EXT] */
39 { _IOR('A', 0x20, char[128]), _IOR('A', 0x20, char[108]), 108, R
, 1, OFFS(4,8,12,16,52,56,60,64) },
40 { _IOWR('A', 0x24, char[128]), _IOWR('A', 0x24, char[108]), 108, WR
, 1, OFFS(4,8,12,16,52,56,60,64) },
42 /* SNDRV_RAWMIDI_IOCTL_STATUS */
43 { _IOWR('W', 0x20, char[48]), _IOWR('W', 0x20, char[36]), 36, WR
, 1, OFFS(4,8) },
45 /* SNDRV_PCM_IOCTL_SYNC_PTR - with 3 subtables */
46 { _IOWR('A', 0x23, char[136]), _IOWR('A', 0x23, char[132]), 0, WR
, 1, 0 },
47 { 0, 0, 4, WR
, 1, 0 }, /* snd_pcm_sync_ptr (flags only) */
48 { 0, 0, 32, WR
, 1, OFFS(8,12,16,24,28) }, /* snd_pcm_mmap_status */
49 { 0, 0, 8, WR
, 1, OFFS(0,4) }, /* snd_pcm_mmap_control */
51 /* VIDIOC_QUERYBUF, VIDIOC_QBUF, VIDIOC_DQBUF, VIDIOC_PREPARE_BUF */
52 { _IOWR('V', 9, new_misaligned(72)), _IOWR('V', 9, char[72]), 72, WR
, 0, OFFS(20) },
53 { _IOWR('V', 15, new_misaligned(72)), _IOWR('V', 15, char[72]), 72, WR
, 0, OFFS(20) },
54 { _IOWR('V', 17, new_misaligned(72)), _IOWR('V', 17, char[72]), 72, WR
, 0, OFFS(20) },
55 { _IOWR('V', 93, new_misaligned(72)), _IOWR('V', 93, char[72]), 72, WR
, 0, OFFS(20) },
58 { _IOR('V', 89, new_misaligned(96)), _IOR('V', 89, char[96]), 96, R
, 0, OFFS(76,80) },
60 /* VIDIOC_OMAP3ISP_STAT_REQ */
61 { _IOWR('V', 192+6, char[32]), _IOWR('V', 192+6, char[24]), 22, WR
, 0, OFFS(0,4) },
64 { _IOR('t', 63, char[16]), _IOR('t', 63, char[8]), 8, R
, 0, OFFS(0,4) },
66 /* PPGETTIME, PPSETTIME */
67 { _IOR('p', 0x95, char[16]), _IOR('p', 0x95, char[8]), 8, R
, 0, OFFS(0,4) },
68 { _IOW('p', 0x96, char[16]), _IOW('p', 0x96, char[8]), 8, W
, 0, OFFS(0,4) },
71 { _IOW(0x6, 0xf, char[16]), 0x060f, 8, W
, 0, OFFS(0,4) },
74 static void convert_ioctl_struct(const struct ioctl_compat_map
*map
, char *old
, char *new, int dir
)
78 int old_size
= map
->old_size
;
79 if (!(dir
& map
->dir
)) return;
81 /* offsets hard-coded for SNDRV_PCM_IOCTL_SYNC_PTR;
82 * if another exception appears this needs changing. */
83 convert_ioctl_struct(map
+1, old
, new, dir
);
84 convert_ioctl_struct(map
+2, old
+4, new+8, dir
);
85 convert_ioctl_struct(map
+3, old
+68, new+72, dir
);
88 for (int i
=0; i
< map
->noffs
; i
++) {
89 int ts_offset
= map
->offsets
[i
];
90 int len
= ts_offset
-old_offset
;
91 if (dir
==W
) memcpy(old
+old_offset
, new+new_offset
, len
);
92 else memcpy(new+new_offset
, old
+old_offset
, len
);
97 int align
= map
->force_align
? sizeof(time_t) : alignof(time_t);
98 new_offset
+= (align
-1) & -new_offset
;
100 memcpy(&new_ts
, new+new_offset
, sizeof new_ts
);
102 memcpy(old
+old_offset
, &old_ts
, sizeof old_ts
);
104 memcpy(&old_ts
, old
+old_offset
, sizeof old_ts
);
106 memcpy(new+new_offset
, &new_ts
, sizeof new_ts
);
108 new_offset
+= sizeof new_ts
;
109 old_offset
+= sizeof old_ts
;
111 if (dir
==W
) memcpy(old
+old_offset
, new+new_offset
, old_size
-old_offset
);
112 else memcpy(new+new_offset
, old
+old_offset
, old_size
-old_offset
);
115 int ioctl(int fd
, int req
, ...)
120 arg
= va_arg(ap
, void *);
122 int r
= __syscall(SYS_ioctl
, fd
, req
, arg
);
123 if (req
&& r
==-ENOTTY
) {
124 for (int i
=0; i
<sizeof compat_map
/sizeof *compat_map
; i
++) {
125 if (compat_map
[i
].new_req
!= req
) continue;
130 convert_ioctl_struct(&compat_map
[i
], u
.buf
, arg
, W
);
131 r
= __syscall(SYS_ioctl
, fd
, compat_map
[i
].old_req
, u
.buf
);
133 convert_ioctl_struct(&compat_map
[i
], u
.buf
, arg
, R
);
137 return __syscall_ret(r
);