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Source file src/runtime/sys_x86.go

  // 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 amd64p32 386
  
  package runtime
  
  import (
  	"runtime/internal/sys"
  	"unsafe"
  )
  
  // adjust Gobuf as it if 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
  }
  

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