sigframe32
struct sigframe32 *fp, frame;
fp = (struct sigframe32 *)((uintptr_t)td->td_sigstk.ss_sp +
fp = (struct sigframe32 *)td->td_frame->tf_x[13];
fp = (struct sigframe32 *)((unsigned long)(fp) &~ (8 - 1));
struct sigframe32 sf32;
offsetof(struct sigframe32, sf_uc) :
offsetof(struct sigframe32, sf_si);