sc_sp
frame.sf_sc.sc_sp = tf->tf_sp;
tf->tf_sp = ksc.sc_sp;
unsigned long sc_sp;
__register_t sc_sp;
frame.sf_sc.sc_sp = tf->tf_sp;
tf->tf_sp = ksc.sc_sp;
long sc_sp; /* %sp to restore */
sf.sf_sc.sc_sp = (long)tf->tf_out[6];
tf->tf_out[6] = (u_int64_t)scp->sc_sp;