HPPA_FRAME_CRP
return (copyout(&zero, (caddr_t)(stack + HPPA_FRAME_CRP),
*(register_t*)(sp + HPPA_FRAME_CRP) = (register_t)&proc_trampoline;
stw rp, HPPA_FRAME_CRP(sr0,sp) !\
ldw HPPA_FRAME_CRP(sr0,sp) ,rp