}
	return libcall.r1
}

//go:nosplit
func sysvicall1(fn *libcFunc, a1 uintptr) uintptr {
	r1, _ := sysvicall1Err(fn, a1)
	return r1
}

// sysvicall1Err returns both the system call result and the errno value.
// This is used by sysvicall1 and pipe.
//
//go:nosplit
func sysvicall1Err(fn *libcFunc, a1 uintptr) (r1, err uintptr) {
	// Leave caller's PC/SP around for traceback.
	gp := getg()
	var mp *m