1// Copyright 2014 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// +build windows
6// +build go1.3
7
8package svc
9
10import "unsafe"
11
12const ptrSize = 4 << (^uintptr(0) >> 63) // unsafe.Sizeof(uintptr(0)) but an ideal const
13
14// Should be a built-in for unsafe.Pointer?
15func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
16	return unsafe.Pointer(uintptr(p) + x)
17}
18
19// funcPC returns the entry PC of the function f.
20// It assumes that f is a func value. Otherwise the behavior is undefined.
21func funcPC(f interface{}) uintptr {
22	return **(**uintptr)(add(unsafe.Pointer(&f), ptrSize))
23}
24
25// from sys_386.s and sys_amd64.s
26func servicectlhandler(ctl uint32) uintptr
27func servicemain(argc uint32, argv **uint16)
28
29func getServiceMain(r *uintptr) {
30	*r = funcPC(servicemain)
31}
32