linux_save_sigcontext
linux_save_sigcontext(l, &tmp_sigframe->uc.luc_mcontext);
static void linux_save_sigcontext(struct lwp *, struct trapframe *,
linux_save_sigcontext(l, tf, mask, &uc->uc_mcontext);
linux_save_sigcontext(l, tf, mask, &frame.sf_sc);