1 #include <sys/ioctl.h>
2 #include <stdarg.h>
3 #include <errno.h>
4 #include <time.h>
5 #include <sys/time.h>
6 #include <stddef.h>
7 #include <string.h>
8 #include "syscall.h"
9
10 #define alignof(t) offsetof(struct { char c; t x; }, x)
11
12 #define W 1
13 #define R 2
14 #define WR 3
15
16 struct ioctl_compat_map {
17 int new_req, old_req;
18 unsigned char old_size, dir, force_align, noffs;
19 unsigned char offsets[8];
20 };
21
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__ }
25
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]; }
30
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) },
34
35 /* SNDRV_TIMER_IOCTL_STATUS */
36 { _IOR('T', 0x14, char[96]), _IOR('T', 0x14, 88), 88, R, 0, OFFS(0,4) },
37
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) },
41
42 /* SNDRV_RAWMIDI_IOCTL_STATUS */
43 { _IOWR('W', 0x20, char[48]), _IOWR('W', 0x20, char[36]), 36, WR, 1, OFFS(4,8) },
44
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 */
50
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) },
56
57 /* VIDIOC_DQEVENT */
58 { _IOR('V', 89, new_misaligned(96)), _IOR('V', 89, char[96]), 96, R, 0, OFFS(76,80) },
59
60 /* VIDIOC_OMAP3ISP_STAT_REQ */
61 { _IOWR('V', 192+6, char[32]), _IOWR('V', 192+6, char[24]), 22, WR, 0, OFFS(0,4) },
62
63 /* PPPIOCGIDLE */
64 { _IOR('t', 63, char[16]), _IOR('t', 63, char[8]), 8, R, 0, OFFS(0,4) },
65
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) },
69
70 /* LPSETTIMEOUT */
71 { _IOW(0x6, 0xf, char[16]), 0x060f, 8, W, 0, OFFS(0,4) },
72 };
73
convert_ioctl_struct(const struct ioctl_compat_map * map,char * old,char * new,int dir)74 static void convert_ioctl_struct(const struct ioctl_compat_map *map, char *old, char *new, int dir)
75 {
76 int new_offset = 0;
77 int old_offset = 0;
78 int old_size = map->old_size;
79 if (!(dir & map->dir)) return;
80 if (!map->old_size) {
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);
86 return;
87 }
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);
93 new_offset += len;
94 old_offset += len;
95 long long new_ts;
96 long old_ts;
97 int align = map->force_align ? sizeof(time_t) : alignof(time_t);
98 new_offset += (align-1) & -new_offset;
99 if (dir==W) {
100 memcpy(&new_ts, new+new_offset, sizeof new_ts);
101 old_ts = new_ts;
102 memcpy(old+old_offset, &old_ts, sizeof old_ts);
103 } else {
104 memcpy(&old_ts, old+old_offset, sizeof old_ts);
105 new_ts = old_ts;
106 memcpy(new+new_offset, &new_ts, sizeof new_ts);
107 }
108 new_offset += sizeof new_ts;
109 old_offset += sizeof old_ts;
110 }
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);
113 }
114
ioctl(int fd,int req,...)115 int ioctl(int fd, int req, ...)
116 {
117 void *arg;
118 va_list ap;
119 va_start(ap, req);
120 arg = va_arg(ap, void *);
121 va_end(ap);
122 int r = __syscall(SYS_ioctl, fd, req, arg);
123 if (SIOCGSTAMP != SIOCGSTAMP_OLD && 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;
126 union {
127 long long align;
128 char buf[256];
129 } u;
130 convert_ioctl_struct(&compat_map[i], u.buf, arg, W);
131 r = __syscall(SYS_ioctl, fd, compat_map[i].old_req, u.buf);
132 if (r<0) break;
133 convert_ioctl_struct(&compat_map[i], u.buf, arg, R);
134 break;
135 }
136 }
137 return __syscall_ret(r);
138 }
139