y2038: nptl: Convert sem_{clock|timed}wait to support 64 bit time

The sem_clockwait and sem_timedwait have been converted to support 64 bit time.

This change reuses futex_abstimed_wait_cancelable64 function introduced earlier.
The sem_{clock|timed}wait only accepts absolute time. Moreover, there is no
need to check for NULL passed as *abstime pointer to the syscalls as both calls
have exported symbols marked with __nonull attribute for abstime.

For systems with __TIMESIZE != 64 && __WORDSIZE == 32:
- Conversion from 32 bit time to 64 bit struct __timespec64 was necessary
- Redirection to __sem_{clock|timed}wait64 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 __sem_{clock|timed}wait64 and
__sem_{clock|timed}wait.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

nptl/sem_clockwait.c

@@ -19,11 +19,12 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <time.h>
+#include "semaphoreP.h"
 #include "sem_waitcommon.c"
 
 int
-sem_clockwait (sem_t *sem, clockid_t clockid,
+__sem_clockwait64 (sem_t *sem, clockid_t clockid,
-	       const struct timespec *abstime)
+                   const struct __timespec64 *abstime)
 {
   /* Check that supplied clockid is one we support, even if we don't end up
      waiting.  */
@@ -42,5 +43,18 @@ sem_clockwait (sem_t *sem, clockid_t clockid,
   if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
     return 0;
   else
-    return __new_sem_wait_slow ((struct new_sem *) sem, clockid, abstime);
+    return __new_sem_wait_slow64 ((struct new_sem *) sem, clockid, abstime);
 }
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__sem_clockwait64)
+
+int
+__sem_clockwait (sem_t *sem, clockid_t clockid, const struct timespec *abstime)
+{
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*abstime);
+
+  return __sem_clockwait64 (sem, clockid, &ts64);
+}
+#endif
+weak_alias (__sem_clockwait, sem_clockwait)

nptl/sem_timedwait.c

@@ -18,12 +18,13 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <time.h>
+#include "semaphoreP.h"
 #include "sem_waitcommon.c"
 
 /* This is in a separate file because because sem_timedwait is only provided
    if __USE_XOPEN2K is defined.  */
 int
-sem_timedwait (sem_t *sem, const struct timespec *abstime)
+__sem_timedwait64 (sem_t *sem, const struct __timespec64 *abstime)
 {
   if (! valid_nanoseconds (abstime->tv_nsec))
     {
@@ -37,6 +38,19 @@ sem_timedwait (sem_t *sem, const struct timespec *abstime)
   if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
     return 0;
   else
-    return __new_sem_wait_slow ((struct new_sem *) sem,
+    return __new_sem_wait_slow64 ((struct new_sem *) sem,
-				CLOCK_REALTIME, abstime);
+				  CLOCK_REALTIME, abstime);
 }
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__sem_timedwait64)
+
+int
+__sem_timedwait (sem_t *sem, const struct timespec *abstime)
+{
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*abstime);
+
+  return __sem_timedwait64 (sem, &ts64);
+}
+#endif
+weak_alias (__sem_timedwait, sem_timedwait)

nptl/sem_wait.c

@@ -18,6 +18,7 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <lowlevellock.h>	/* lll_futex* used by the old code.  */
+#include "semaphoreP.h"
 #include "sem_waitcommon.c"
 
 int
@@ -39,8 +40,8 @@ __new_sem_wait (sem_t *sem)
   if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
     return 0;
   else
-    return __new_sem_wait_slow ((struct new_sem *) sem,
+    return __new_sem_wait_slow64 ((struct new_sem *) sem,
-				CLOCK_REALTIME, NULL);
+				  CLOCK_REALTIME, NULL);
 }
 versioned_symbol (libpthread, __new_sem_wait, sem_wait, GLIBC_2_1);
 

nptl/sem_waitcommon.c

@@ -104,18 +104,18 @@ __sem_wait_cleanup (void *arg)
 static int
 __attribute__ ((noinline))
 do_futex_wait (struct new_sem *sem, clockid_t clockid,
-	       const struct timespec *abstime)
+	       const struct __timespec64 *abstime)
 {
   int err;
 
 #if __HAVE_64B_ATOMICS
-  err = futex_abstimed_wait_cancelable (
+  err = __futex_abstimed_wait_cancelable64 (
       (unsigned int *) &sem->data + SEM_VALUE_OFFSET, 0,
       clockid, abstime,
       sem->private);
 #else
-  err = futex_abstimed_wait_cancelable (&sem->value, SEM_NWAITERS_MASK,
+  err = __futex_abstimed_wait_cancelable64 (&sem->value, SEM_NWAITERS_MASK,
-					clockid, abstime, sem->private);
+					    clockid, abstime, sem->private);
 #endif
 
   return err;
@@ -162,8 +162,8 @@ __new_sem_wait_fast (struct new_sem *sem, int definitive_result)
 /* Slow path that blocks.  */
 static int
 __attribute__ ((noinline))
-__new_sem_wait_slow (struct new_sem *sem, clockid_t clockid,
+__new_sem_wait_slow64 (struct new_sem *sem, clockid_t clockid,
-		     const struct timespec *abstime)
+		       const struct __timespec64 *abstime)
 {
   int err = 0;
 

nptl/semaphoreP.h

@@ -52,3 +52,16 @@ extern int __new_sem_wait (sem_t *sem);
 extern int __old_sem_wait (sem_t *sem);
 extern int __new_sem_trywait (sem_t *sem);
 extern int __new_sem_getvalue (sem_t *sem, int *sval);
+
+#if __TIMESIZE == 64
+# define __sem_clockwait64 __sem_clockwait
+# define __sem_timedwait64 __sem_timedwait
+#else
+extern int
+__sem_clockwait64 (sem_t *sem, clockid_t clockid,
+                   const struct __timespec64 *abstime);
+libpthread_hidden_proto (__sem_clockwait64)
+extern int
+__sem_timedwait64 (sem_t *sem, const struct __timespec64 *abstime);
+libpthread_hidden_proto (__sem_timedwait64)
+#endif