r_fp
rp->r_fp = 0; /* terminate kernel stack traces! */
sp = rp->r_fp;
sp = rp->r_fp;
sp = rp->r_fp;
ret = fasttrap_sulword((void *)addr, rp->r_fp);
(uint32_t)rp->r_fp);
traceback((caddr_t)rp->r_fp);
lwptoregs(ttolwp(curthread))->r_fp = 0; /* stack ends here */