// 32 (args of callReflect) + 8 (bool + padding) + 392 (abi.RegArgs) = 432.

// makeFuncStub is the code half of the function returned by MakeFunc.
// See the comment on the declaration of makeFuncStub in makefunc.go
// for more details.
// No arg size here, runtime pulls arg map out of the func value.
TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$432
	NO_LOCAL_POINTERS
	ADDV	$LOCAL_REGARGS, R3, R25 // spillArgs using R25

	return Value{t, unsafe.Pointer(impl), flag(Func)}
}

// makeFuncStub is an assembly function that is the code half of
// the function returned from MakeFunc. It expects a *callReflectFunc
// as its context register, and its job is to invoke callReflect(ctxt, frame)
// where ctxt is the context register and frame is a pointer to the first
// word in the passed-in argument frame.
func makeFuncStub()

	if f.args != abi.ArgsSizeUnknown {
		argMap.n = f.args / goarch.PtrSize
		return
	}
	// Extract argument bitmaps for reflect stubs from the calls they made to reflect.
	switch funcname(f) {
	case "reflect.makeFuncStub", "reflect.methodValueCall":
		// These take a *reflect.methodValue as their
		// context register and immediately save it to 0(SP).
		// Get the methodValue from 0(SP).
		arg0 := frame.sp + sys.MinFrameSize

		// include: various points in the scheduler ("don't
		// preempt between here and here"), much of the defer
		// implementation (untyped info on stack), bulk write
		// barriers (write barrier check),
		// reflect.{makeFuncStub,methodValueCall}.
		//
		// TODO(austin): We should improve this, or opt things
		// in incrementally.
		return false, 0
	}
	switch up {
	case abi.UnsafePointRestart1, abi.UnsafePointRestart2:

	// passed to reflectcall.
	stackPtrs *bitVector

	// inRegPtrs is a bitmap whose i'th bit indicates
	// whether the i'th integer argument register contains
	// a pointer. Used by makeFuncStub and methodValueCall
	// to make result pointers visible to the GC.
	//
	// outRegPtrs is the same, but for result values.
	// Used by reflectcall to make result pointers visible
	// to the GC.

		// in runtime/mwbbuf.go:wbBufFlush.
		//
		// reflect.callReflect and reflect.callMethod are called from special
		// functions makeFuncStub and methodValueCall. The runtime expects
		// that it can find the first argument (ctxt) at 0(SP) in makeFuncStub
		// and methodValueCall's frame (see runtime/traceback.go:getArgInfo).
		// Normally callReflect and callMethod already do not modify the

	if callGC {
		// Call GC upon entry during testing.
		// Getting our stack scanned here is the biggest hazard, because
		// our caller (makeFuncStub) could have failed to place the last
		// pointer to a value in regs' pointer space, in which case it
		// won't be visible to the GC.
		runtime.GC()
	}
	ftyp := ctxt.ftyp
	f := ctxt.fn