Introduce time64 support.

This patch introduces *time64 syscalls support for uClibc-ng.
Currently the redirection of syscalls to their *time64
analogs is fully supported for 32bit ARM (ARMv5, ARMv6, ARMv7).
The main changes that take effect when time64 feature is enabled are:
- sizeof(time_t) is 8.
- There is a possibility os setting date beyond year 2038.
- some syscalls are redirected:
clock_adjtime -> clock_adjtime64
clock_getres -> clock_getres_time64
clock_gettime -> clock_gettime64
clock_nanosleep -> clock_nanosleep_time64
clock_settime -> clock_settime64
futex -> futex_time64
mq_timedreceive -> mq_timedreceive_time64
mq_timedsend -> mq_timedsend_time64
ppoll -> ppoll_time64
pselect6 -> pselect6_time64
recvmmsg -> recvmmsg_time64
rt_sigtimedwait -> rt_sigtimedwait_time64
sched_rr_get_interval -> sched_rr_get_interval_time64
semtimedop -> semtimedop_time64
timer_gettime -> timer_gettime64
timer_settime -> timer_settime64
timerfd_gettime -> timerfd_gettime64
timerfd_settime -> timerfd_settime64
utimensat -> utimensat_time64.

- settimeofday uses clock_settime (like in glibc/musl).
- gettimeofday uses clock_gettime (like in glibc/musl).
- nanosleep uses clock_nanosleep (like in glibc/musl).

- There are some fixes in data structures used by libc and kernel
for correct data handling both with and without enabled time64 support.

Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>

2 files changed, 17 insertions, 3 deletions

diff --git a/libc/misc/sysvipc/sem.c b/libc/misc/sysvipc/sem.c
index 64be1cae0..cd541761c 100644
--- a/libc/misc/sysvipc/sem.c
+++ b/libc/misc/sysvipc/sem.c
@@ -53,7 +53,12 @@ int semctl(int semid, int semnum, int cmd, ...)
     arg = va_arg (ap, union semun);
     va_end (ap);
 #ifdef __NR_semctl
-    return __semctl(semid, semnum, cmd | __IPC_64, arg.__pad);
+    int __ret = __semctl(semid, semnum, cmd | __IPC_64, arg.__pad);
+#if defined(__UCLIBC_USE_TIME64__)
+    arg.buf->sem_otime = (__time_t)arg.buf->__sem_otime_internal_1 | (__time_t)(arg.buf->__sem_otime_internal_2) << 32;
+    arg.buf->sem_ctime = (__time_t)arg.buf->__sem_ctime_internal_1 | (__time_t)(arg.buf->__sem_ctime_internal_2) << 32;
+#endif
+    return __ret;
 #else
     return __syscall_ipc(IPCOP_semctl, semid, semnum, cmd|__IPC_64, &arg, NULL);
 #endif
@@ -90,7 +95,9 @@ int semop (int semid, struct sembuf *sops, size_t nsops)
 
 #ifdef L_semtimedop
 
-#ifdef __NR_semtimedop
+#if defined(__UCLIBC_USE_TIME64__) && defined(__NR_semtimedop_time64)
+_syscall4_time64(int, semtimedop, int, semid, struct sembuf *, sops, size_t, nsops, const struct timespec *, timeout)
+#elif defined(__NR_semtimedop)
 _syscall4(int, semtimedop, int, semid, struct sembuf *, sops, size_t, nsops, const struct timespec *, timeout)
 
 #else
diff --git a/libc/misc/time/time.c b/libc/misc/time/time.c
index 0f7c6a33f..b6a5b097d 100644
--- a/libc/misc/time/time.c
+++ b/libc/misc/time/time.c
@@ -2478,9 +2478,16 @@ DST_CORRECT:
 							+ p[3]) + p[7])));
 
 DST_CORRECT:
+#if defined(__UCLIBC_USE_TIME64__)
+	if (((unsigned long long)(secs - LLONG_MIN))
+		> (((unsigned long long)LLONG_MAX) - LLONG_MIN)
+		)
+#else
 	if (((unsigned long long)(secs - LONG_MIN))
 		> (((unsigned long long)LONG_MAX) - LONG_MIN)
-		) {
+		)
+#endif
+	{
 		t = ((time_t)(-1));
 		goto DONE;
 	}