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// Copyright 2013 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 amd64 386
package runtime
import (
// adjust Gobuf as if it executed a call to fn with context ctxt
// and then did an immediate gosave.
func gostartcall(buf *gobuf, fn, ctxt unsafe.Pointer) {
sp := buf.sp
if sys.RegSize > sys.PtrSize {
sp -= sys.PtrSize
*(*uintptr)(unsafe.Pointer(sp)) = 0
sp -= sys.PtrSize
*(*uintptr)(unsafe.Pointer(sp)) = buf.pc
buf.sp = sp
buf.pc = uintptr(fn)
buf.ctxt = ctxt