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      1 // Copyright 2013 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 package runtime
      6 
      7 import "unsafe"
      8 
      9 // adjust Gobuf as if it executed a call to fn with context ctxt
     10 // and then did an immediate Gosave.
     11 func gostartcall(buf *gobuf, fn, ctxt unsafe.Pointer) {
     12 	if buf.lr != 0 {
     13 		throw("invalid use of gostartcall")
     14 	}
     15 	buf.lr = buf.pc
     16 	buf.pc = uintptr(fn)
     17 	buf.ctxt = ctxt
     18 }
     19 
     20 // for testing
     21 func usplit(x uint32) (q, r uint32)
     22