fpu_cleandata
sfp = fpu_cleandata;
xrstors(fpu_cleandata, xsave_mask);
memcpy(&p->p_addr->u_pcb.pcb_savefpu, fpu_cleandata,
memcpy(sfp, fpu_cleandata, fpu_save_len);
xrstor_kern(fpu_cleandata, xsave_mask)