diff --git a/src/pkg/runtime/freebsd/386/signal.c b/src/pkg/runtime/freebsd/386/signal.c
index 2b9d9aa9887..1ae2554eb47 100644
--- a/src/pkg/runtime/freebsd/386/signal.c
+++ b/src/pkg/runtime/freebsd/386/signal.c
@@ -137,7 +137,9 @@ sigaction(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
 	if(restart)
 		sa.sa_flags |= SA_RESTART;
 	sa.sa_mask = ~0ULL;
-	sa.__sigaction_u.__sa_sigaction = (uintptr)fn;
+	if (fn == runtime·sighandler)
+		fn = (void*)runtime·sigtramp;
+	sa.__sigaction_u.__sa_sigaction = (void*)fn;
 	runtime·sigaction(i, &sa, nil);
 }
 
@@ -165,7 +167,6 @@ runtime·initsig(int32 queue)
 void
 runtime·resetcpuprofiler(int32 hz)
 {
-	Sigaction sa;
 	Itimerval it;
 	
 	runtime·memclr((byte*)&it, sizeof it);
diff --git a/src/pkg/runtime/freebsd/amd64/defs.h b/src/pkg/runtime/freebsd/amd64/defs.h
index 2a295a47944..b101b19327c 100644
--- a/src/pkg/runtime/freebsd/amd64/defs.h
+++ b/src/pkg/runtime/freebsd/amd64/defs.h
@@ -61,6 +61,9 @@ enum {
 	BUS_OBJERR = 0x3,
 	SEGV_MAPERR = 0x1,
 	SEGV_ACCERR = 0x2,
+	ITIMER_REAL = 0,
+	ITIMER_VIRTUAL = 0x1,
+	ITIMER_PROF = 0x2,
 };
 
 // Types
@@ -83,7 +86,7 @@ struct ThrParam {
 	int64 *child_tid;
 	int64 *parent_tid;
 	int32 flags;
-	byte pad0[4];
+	byte pad_godefs_0[4];
 	Rtprio *rtp;
 	void* spare[3];
 };
@@ -93,7 +96,7 @@ struct Sigaltstack {
 	int8 *ss_sp;
 	uint64 ss_size;
 	int32 ss_flags;
-	byte pad0[4];
+	byte pad_godefs_0[4];
 };
 
 typedef struct Sigset Sigset;
@@ -114,7 +117,7 @@ struct StackT {
 	int8 *ss_sp;
 	uint64 ss_size;
 	int32 ss_flags;
-	byte pad0[4];
+	byte pad_godefs_0[4];
 };
 
 typedef struct Siginfo Siginfo;
@@ -178,6 +181,18 @@ struct Ucontext {
 	StackT uc_stack;
 	int32 uc_flags;
 	int32 __spare__[4];
-	byte pad0[12];
+	byte pad_godefs_0[12];
+};
+
+typedef struct Timeval Timeval;
+struct Timeval {
+	int64 tv_sec;
+	int64 tv_usec;
+};
+
+typedef struct Itimerval Itimerval;
+struct Itimerval {
+	Timeval it_interval;
+	Timeval it_value;
 };
 #pragma pack off
diff --git a/src/pkg/runtime/freebsd/amd64/signal.c b/src/pkg/runtime/freebsd/amd64/signal.c
index ddab9ee51af..9d8e5e69295 100644
--- a/src/pkg/runtime/freebsd/amd64/signal.c
+++ b/src/pkg/runtime/freebsd/amd64/signal.c
@@ -145,7 +145,9 @@ sigaction(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
 	if(restart)
 		sa.sa_flags |= SA_RESTART;
 	sa.sa_mask = ~0ULL;
-	sa.__sigaction_u.__sa_sigaction = (uintptr)fn;
+	if (fn == runtime·sighandler)
+		fn = (void*)runtime·sigtramp;
+	sa.__sigaction_u.__sa_sigaction = (void*)fn;
 	runtime·sigaction(i, &sa, nil);
 }
 
@@ -173,7 +175,6 @@ runtime·initsig(int32 queue)
 void
 runtime·resetcpuprofiler(int32 hz)
 {
-	Sigaction sa;
 	Itimerval it;
 	
 	runtime·memclr((byte*)&it, sizeof it);
diff --git a/src/pkg/runtime/freebsd/defs.c b/src/pkg/runtime/freebsd/defs.c
index faa1447ccb5..2ce4fdc51f7 100644
--- a/src/pkg/runtime/freebsd/defs.c
+++ b/src/pkg/runtime/freebsd/defs.c
@@ -19,6 +19,7 @@
 #include <sys/rtprio.h>
 #include <sys/thr.h>
 #include <sys/_sigset.h>
+#include <sys/unistd.h>
 
 enum {
 	$PROT_NONE = PROT_NONE,
@@ -103,4 +104,5 @@ typedef siginfo_t $Siginfo;
 
 typedef mcontext_t $Mcontext;
 typedef ucontext_t $Ucontext;
+typedef struct timeval $Timeval;
 typedef struct itimerval $Itimerval;
diff --git a/src/pkg/runtime/freebsd/os.h b/src/pkg/runtime/freebsd/os.h
index fd954c0e6e7..13754688b4b 100644
--- a/src/pkg/runtime/freebsd/os.h
+++ b/src/pkg/runtime/freebsd/os.h
@@ -7,3 +7,4 @@ void runtime·sigaltstack(Sigaltstack*, Sigaltstack*);
 struct sigaction;
 void runtime·sigaction(int32, struct sigaction*, struct sigaction*);
 void	runtiem·setitimerval(int32, Itimerval*, Itimerval*);
+void	runtime·setitimer(int32, Itimerval*, Itimerval*);