PGEX_FPFAULT
if (frame->tf_xflags & PGEX_FPFAULT) {
tf->tf_xflags &= ~PGEX_FPFAULT;
tf->tf_xflags &= ~PGEX_FPFAULT;
tf->tf_xflags |= PGEX_FPFAULT;
if (frame->tf_xflags & PGEX_FPFAULT) {