[PATCH] Update FreeBSD kernel timespec support

[Sebastian Huber]

This change is based on the following FreeBSD commit:

"Make timespecadd(3) and friends public

The timespecadd(3) family of macros were imported from NetBSD back in
r35029. However, they were initially guarded by #ifdef _KERNEL. In the
meantime, we have grown at least 28 syscalls that use timespecs in some
way, leading many programs both inside and outside of the base system to
redefine those macros. It's better just to make the definitions public.

Our kernel currently defines two-argument versions of timespecadd and
timespecsub.  NetBSD, OpenBSD, and FreeDesktop.org's libbsd, however, define
three-argument versions.  Solaris also defines a three-argument version, but
only in its kernel.  This revision changes our definition to match the
common three-argument version.

Bump _FreeBSD_version due to the breaking KPI change.

Discussed with:	cem, jilles, ian, bde
Differential Revision:	https://reviews.freebsd.org/D14725"

To make the change public (outside #ifdef _KERNEL) it must be integrated
in Newlib.

Update #3472.
---
 cpukit/include/machine/_kernel_time.h | 25 +++++++++++++------------
 cpukit/score/src/kern_tc.c            |  2 +-
 2 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/cpukit/include/machine/_kernel_time.h b/cpukit/include/machine/_kernel_time.h
index 8200b6a73e..6a525fc374 100644
--- a/cpukit/include/machine/_kernel_time.h
+++ b/cpukit/include/machine/_kernel_time.h
@@ -37,22 +37,23 @@
 	(((tvp)->tv_sec == (uvp)->tv_sec) ?				\
 	    ((tvp)->tv_nsec cmp (uvp)->tv_nsec) :			\
 	    ((tvp)->tv_sec cmp (uvp)->tv_sec))
-#define	timespecadd(vvp, uvp)						\
+
+#define	timespecadd(tsp, usp, vsp)					\
 	do {								\
-		(vvp)->tv_sec += (uvp)->tv_sec;				\
-		(vvp)->tv_nsec += (uvp)->tv_nsec;			\
-		if ((vvp)->tv_nsec >= 1000000000) {			\
-			(vvp)->tv_sec++;				\
-			(vvp)->tv_nsec -= 1000000000;			\
+		(vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec;		\
+		(vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec;	\
+		if ((vsp)->tv_nsec >= 1000000000L) {			\
+			(vsp)->tv_sec++;				\
+			(vsp)->tv_nsec -= 1000000000L;			\
 		}							\
 	} while (0)
-#define	timespecsub(vvp, uvp)						\
+#define	timespecsub(tsp, usp, vsp)					\
 	do {								\
-		(vvp)->tv_sec -= (uvp)->tv_sec;				\
-		(vvp)->tv_nsec -= (uvp)->tv_nsec;			\
-		if ((vvp)->tv_nsec < 0) {				\
-			(vvp)->tv_sec--;				\
-			(vvp)->tv_nsec += 1000000000;			\
+		(vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;		\
+		(vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec;	\
+		if ((vsp)->tv_nsec < 0) {				\
+			(vsp)->tv_sec--;				\
+			(vsp)->tv_nsec += 1000000000L;			\
 		}							\
 	} while (0)
 
diff --git a/cpukit/score/src/kern_tc.c b/cpukit/score/src/kern_tc.c
index 99c6664fcb..d705b59a4c 100644
--- a/cpukit/score/src/kern_tc.c
+++ b/cpukit/score/src/kern_tc.c
@@ -2044,7 +2044,7 @@ pps_event(struct pps_state *pps, int event)
 	*tsp = ts;
 
 	if (foff) {
-		timespecadd(tsp, osp);
+		timespecadd(tsp, osp, tsp);
 		if (tsp->tv_nsec < 0) {
 			tsp->tv_nsec += 1000000000;
 			tsp->tv_sec -= 1;
-- 
2.13.7