LOONGARCH_FCSR0
write_fcsr(LOONGARCH_FCSR0, fcsr0);
fcsr0 = read_fcsr(LOONGARCH_FCSR0);
write_fcsr(LOONGARCH_FCSR0, fcsr1);
fcsr1 = read_fcsr(LOONGARCH_FCSR0);
write_fcsr(LOONGARCH_FCSR0, fcsr);
write_fcsr(LOONGARCH_FCSR0, 0);
write_fcsr(LOONGARCH_FCSR0, fcsr & ~mask_fcsr_x(fcsr));
kvm_check_fcsr(vcpu, read_fcsr(LOONGARCH_FCSR0));