147 lines
4.9 KiB
C
147 lines
4.9 KiB
C
#include <sys/ioctl.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <time.h>
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#include <sys/time.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include "syscall.h"
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#define alignof(t) offsetof(struct { char c; t x; }, x)
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#define W 1
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#define R 2
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#define WR 3
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struct ioctl_compat_map {
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int new_req, old_req;
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unsigned char old_size, dir, force_align, noffs;
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unsigned char offsets[8];
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};
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#define NINTH(a,b,c,d,e,f,g,h,i,...) i
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#define COUNT(...) NINTH(__VA_ARGS__,8,7,6,5,4,3,2,1,0)
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#define OFFS(...) COUNT(__VA_ARGS__), { __VA_ARGS__ }
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/* yields a type for a struct with original size n, with a misaligned
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* timeval/timespec expanded from 32- to 64-bit. for use with ioctl
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* number producing macros; only size of result is meaningful. */
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#define new_misaligned(n) struct { int i; time_t t; char c[(n)-4]; }
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struct v4l2_event {
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uint32_t a;
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uint64_t b[8];
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uint32_t c[2], ts[2], d[9];
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};
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static const struct ioctl_compat_map compat_map[] = {
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{ SIOCGSTAMP, SIOCGSTAMP_OLD, 8, R, 0, OFFS(0, 4) },
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{ SIOCGSTAMPNS, SIOCGSTAMPNS_OLD, 8, R, 0, OFFS(0, 4) },
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/* SNDRV_TIMER_IOCTL_STATUS */
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{ _IOR('T', 0x14, char[96]), _IOR('T', 0x14, 88), 88, R, 0, OFFS(0,4) },
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/* SNDRV_PCM_IOCTL_STATUS[_EXT] */
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{ _IOR('A', 0x20, char[128]), _IOR('A', 0x20, char[108]), 108, R, 1, OFFS(4,8,12,16,52,56,60,64) },
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{ _IOWR('A', 0x24, char[128]), _IOWR('A', 0x24, char[108]), 108, WR, 1, OFFS(4,8,12,16,52,56,60,64) },
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/* SNDRV_RAWMIDI_IOCTL_STATUS */
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{ _IOWR('W', 0x20, char[48]), _IOWR('W', 0x20, char[36]), 36, WR, 1, OFFS(4,8) },
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/* SNDRV_PCM_IOCTL_SYNC_PTR - with 3 subtables */
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{ _IOWR('A', 0x23, char[136]), _IOWR('A', 0x23, char[132]), 0, WR, 1, 0 },
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{ 0, 0, 4, WR, 1, 0 }, /* snd_pcm_sync_ptr (flags only) */
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{ 0, 0, 32, WR, 1, OFFS(8,12,16,24,28) }, /* snd_pcm_mmap_status */
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{ 0, 0, 8, WR, 1, OFFS(0,4) }, /* snd_pcm_mmap_control */
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/* VIDIOC_QUERYBUF, VIDIOC_QBUF, VIDIOC_DQBUF, VIDIOC_PREPARE_BUF */
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{ _IOWR('V', 9, new_misaligned(68)), _IOWR('V', 9, char[68]), 68, WR, 1, OFFS(20, 24) },
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{ _IOWR('V', 15, new_misaligned(68)), _IOWR('V', 15, char[68]), 68, WR, 1, OFFS(20, 24) },
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{ _IOWR('V', 17, new_misaligned(68)), _IOWR('V', 17, char[68]), 68, WR, 1, OFFS(20, 24) },
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{ _IOWR('V', 93, new_misaligned(68)), _IOWR('V', 93, char[68]), 68, WR, 1, OFFS(20, 24) },
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/* VIDIOC_DQEVENT */
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{ _IOR('V', 89, new_misaligned(120)), _IOR('V', 89, struct v4l2_event), sizeof(struct v4l2_event),
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R, 0, OFFS(offsetof(struct v4l2_event, ts[0]), offsetof(struct v4l2_event, ts[1])) },
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/* VIDIOC_OMAP3ISP_STAT_REQ */
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{ _IOWR('V', 192+6, char[32]), _IOWR('V', 192+6, char[24]), 22, WR, 0, OFFS(0,4) },
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/* PPPIOCGIDLE */
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{ _IOR('t', 63, char[16]), _IOR('t', 63, char[8]), 8, R, 0, OFFS(0,4) },
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/* PPGETTIME, PPSETTIME */
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{ _IOR('p', 0x95, char[16]), _IOR('p', 0x95, char[8]), 8, R, 0, OFFS(0,4) },
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{ _IOW('p', 0x96, char[16]), _IOW('p', 0x96, char[8]), 8, W, 0, OFFS(0,4) },
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/* LPSETTIMEOUT */
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{ _IOW(0x6, 0xf, char[16]), 0x060f, 8, W, 0, OFFS(0,4) },
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};
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static void convert_ioctl_struct(const struct ioctl_compat_map *map, char *old, char *new, int dir)
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{
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int new_offset = 0;
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int old_offset = 0;
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int old_size = map->old_size;
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if (!(dir & map->dir)) return;
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if (!map->old_size) {
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/* offsets hard-coded for SNDRV_PCM_IOCTL_SYNC_PTR;
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* if another exception appears this needs changing. */
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convert_ioctl_struct(map+1, old, new, dir);
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convert_ioctl_struct(map+2, old+4, new+8, dir);
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convert_ioctl_struct(map+3, old+68, new+72, dir);
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return;
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}
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for (int i=0; i < map->noffs; i++) {
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int ts_offset = map->offsets[i];
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int len = ts_offset-old_offset;
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if (dir==W) memcpy(old+old_offset, new+new_offset, len);
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else memcpy(new+new_offset, old+old_offset, len);
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new_offset += len;
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old_offset += len;
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long long new_ts;
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long old_ts;
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int align = map->force_align ? sizeof(time_t) : alignof(time_t);
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new_offset += (align-1) & -new_offset;
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if (dir==W) {
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memcpy(&new_ts, new+new_offset, sizeof new_ts);
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old_ts = new_ts;
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memcpy(old+old_offset, &old_ts, sizeof old_ts);
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} else {
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memcpy(&old_ts, old+old_offset, sizeof old_ts);
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new_ts = old_ts;
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memcpy(new+new_offset, &new_ts, sizeof new_ts);
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}
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new_offset += sizeof new_ts;
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old_offset += sizeof old_ts;
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}
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if (dir==W) memcpy(old+old_offset, new+new_offset, old_size-old_offset);
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else memcpy(new+new_offset, old+old_offset, old_size-old_offset);
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}
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int ioctl(int fd, int req, ...)
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{
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void *arg;
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va_list ap;
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va_start(ap, req);
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arg = va_arg(ap, void *);
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va_end(ap);
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int r = __syscall(SYS_ioctl, fd, req, arg);
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if (SIOCGSTAMP != SIOCGSTAMP_OLD && req && r==-ENOTTY) {
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for (int i=0; i<sizeof compat_map/sizeof *compat_map; i++) {
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if (compat_map[i].new_req != req) continue;
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union {
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long long align;
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char buf[256];
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} u;
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convert_ioctl_struct(&compat_map[i], u.buf, arg, W);
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r = __syscall(SYS_ioctl, fd, compat_map[i].old_req, u.buf);
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if (r<0) break;
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convert_ioctl_struct(&compat_map[i], u.buf, arg, R);
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break;
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}
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}
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return __syscall_ret(r);
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}
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