From 418b39d436ceda146bbbced0bd716bff2f8371e2 Mon Sep 17 00:00:00 2001
From: Alex Brainman <alex.brainman@gmail.com>
Date: Thu, 10 Jul 2014 14:23:50 +1000
Subject: [PATCH] runtime: align stack before calling windows in usleep2

Fixes #8174.

LGTM=minux
R=golang-codereviews, minux
CC=golang-codereviews
https://golang.org/cl/102360043
---
 src/pkg/runtime/sys_windows_amd64.s | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/pkg/runtime/sys_windows_amd64.s b/src/pkg/runtime/sys_windows_amd64.s
index 72b905ef79..6dc13e293d 100644
--- a/src/pkg/runtime/sys_windows_amd64.s
+++ b/src/pkg/runtime/sys_windows_amd64.s
@@ -367,7 +367,10 @@ usleep1_ret:
 	RET
 
 // Runs on OS stack. duration (in 100ns units) is in BX.
-TEXT runtime·usleep2(SB),NOSPLIT,$8
+TEXT runtime·usleep2(SB),NOSPLIT,$16
+	MOVQ	SP, AX
+	ANDQ	$~15, SP	// alignment as per Windows requirement
+	MOVQ	AX, 8(SP)
 	// Want negative 100ns units.
 	NEGQ	BX
 	MOVQ	SP, R8 // ptime
@@ -376,4 +379,5 @@ TEXT runtime·usleep2(SB),NOSPLIT,$8
 	MOVQ	$0, DX // alertable
 	MOVQ	runtime·NtWaitForSingleObject(SB), AX
 	CALL	AX
+	MOVQ	8(SP), SP
 	RET