y2038: nptl: Convert pthread_rwlock_{clock|timed}{rd|wr}lock to support 64 bit time

The pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock,
pthread_rwlock_timedrdlock and pthread_rwlock_timedwrlock have been converted
to support 64 bit time.

This change uses new futex_abstimed_wait64 function in
./sysdeps/nptl/futex-helpers.c, which uses futex_time64 where possible.

The pthread_rwlock_{clock|timed}{rd|wr}lock only accepts absolute time.
Moreover, there is no need to check for NULL passed as *abstime pointer to the
syscalls as those calls have exported symbols marked with __nonull attribute
for abstime.

For systems with __TIMESIZE != 64 && __WORDSIZE == 32:
- Conversions between 64 bit time to 32 bit are necessary
- Redirection to pthread_rwlock_{clock|timed}{rd|wr}lock will provide support
  for 64 bit time

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Above tests were performed with Y2038 redirection applied as well as without
to test the proper usage of both __pthread_rwlock_{clock|timed}{rd|wr}lock64
and __pthread_rwlock_{clock|timed}{rd|wr}lock.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

1 files changed, 17 insertions, 3 deletions

diff --git a/nptl/pthread_rwlock_timedrdlock.c b/nptl/pthread_rwlock_timedrdlock.c
index c5d8aee909..0bf4559a65 100644
--- a/nptl/pthread_rwlock_timedrdlock.c
+++ b/nptl/pthread_rwlock_timedrdlock.c
@@ -20,8 +20,22 @@
 
 /* See pthread_rwlock_common.c.  */
 int
-pthread_rwlock_timedrdlock (pthread_rwlock_t *rwlock,
-    const struct timespec *abstime)
+__pthread_rwlock_timedrdlock64 (pthread_rwlock_t *rwlock,
+                                const struct __timespec64 *abstime)
 {
-  return __pthread_rwlock_rdlock_full (rwlock, CLOCK_REALTIME, abstime);
+  return __pthread_rwlock_rdlock_full64 (rwlock, CLOCK_REALTIME, abstime);
 }
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__pthread_rwlock_timedrdlock64)
+
+int
+__pthread_rwlock_timedrdlock (pthread_rwlock_t *rwlock,
+                              const struct timespec *abstime)
+{
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*abstime);
+
+  return __pthread_rwlock_timedrdlock64 (rwlock, &ts64);
+}
+#endif
+weak_alias (__pthread_rwlock_timedrdlock, pthread_rwlock_timedrdlock)