runtime: instrument malloc + garbage collector.
add simple garbage collection benchmark.
R=iant
CC=golang-dev
https://golang.org/cl/204053
diff --git a/src/pkg/runtime/freebsd/amd64/sys.s b/src/pkg/runtime/freebsd/amd64/sys.s
index 53773b9..02c3e91 100644
--- a/src/pkg/runtime/freebsd/amd64/sys.s
+++ b/src/pkg/runtime/freebsd/amd64/sys.s
@@ -58,6 +58,21 @@
CALL notok(SB)
RET
+TEXT gettime(SB), 7, $32
+ MOVL $116, AX
+ LEAQ 8(SP), DI
+ SYSCALL
+
+ MOVQ 8(SP), BX // sec
+ MOVQ sec+0(FP), DI
+ MOVQ BX, (DI)
+
+ MOVL 16(SP), BX // usec
+ MOVQ usec+8(FP), DI
+ MOVL BX, (DI)
+ RET
+
+
TEXT sigaction(SB),7,$-8
MOVL 8(SP), DI // arg 1 sig
MOVQ 16(SP), SI // arg 2 act
