// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build amd64 amd64p32 386
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package runtime
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import (
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"runtime/internal/sys"
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"unsafe"
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)
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// adjust Gobuf as if it executed a call to fn with context ctxt
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// and then did an immediate gosave.
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func gostartcall(buf *gobuf, fn, ctxt unsafe.Pointer) {
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sp := buf.sp
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if sys.RegSize > sys.PtrSize {
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sp -= sys.PtrSize
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*(*uintptr)(unsafe.Pointer(sp)) = 0
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}
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sp -= sys.PtrSize
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*(*uintptr)(unsafe.Pointer(sp)) = buf.pc
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buf.sp = sp
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buf.pc = uintptr(fn)
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buf.ctxt = ctxt
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}
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