mc_srr1
if ((mcp->mc_srr1 & psl_userstatic) != (tf->srr1 & psl_userstatic)) {
mcp64.mc_srr1 |= (td->td_frame->srr1 & 0xFFFFFFFF00000000ULL);
if (uc.uc_mcontext.mc_srr1 & PSL_FP)