--- /dev/null
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build windows
+
+// func servicemain(argc uint32, argv **uint16)
+TEXT ·servicemain(SB),7,$0
+ MOVQ SP, AX
+ ANDQ $~15, SP // alignment as per Windows requirement
+ SUBQ $48, SP // room for SP and 4 args as per Windows requirement
+ // plus one extra word to keep stack 16 bytes aligned
+ MOVQ AX, 32(SP)
+
+ MOVL CX, ·sArgc(SB)
+ MOVQ DX, ·sArgv(SB)
+
+ MOVQ ·sName(SB), CX
+ MOVQ $·servicectlhandler(SB), DX
+ // BUG(pastarmovj): Figure out a way to pass in context in R8.
+ // Set context to 123456 to test issue #25660.
+ MOVQ $123456, R8
+ MOVQ ·cRegisterServiceCtrlHandlerExW(SB), AX
+ CALL AX
+ CMPQ AX, $0
+ JE exit
+ MOVQ AX, ·ssHandle(SB)
+
+ MOVQ ·goWaitsH(SB), CX
+ MOVQ ·cSetEvent(SB), AX
+ CALL AX
+
+ MOVQ ·cWaitsH(SB), CX
+ MOVQ $4294967295, DX
+ MOVQ ·cWaitForSingleObject(SB), AX
+ CALL AX
+
+exit:
+ MOVQ 32(SP), SP
+ RET
+
+// I do not know why, but this seems to be the only way to call
+// ctlHandlerProc on Windows 7.
+
+// func ·servicectlhandler(ctl uint32, evtype uint32, evdata uintptr, context uintptr) uintptr {
+TEXT ·servicectlhandler(SB),7,$0
+ MOVQ ·ctlHandlerExProc(SB), AX
+ JMP AX