FPU_CSR_RM
mask = FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_RM;
mask = FPU_CSR_ALL_X | FPU_CSR_ALL_E | FPU_CSR_ALL_S | FPU_CSR_RM;
value |= fcr31 & (FPU_CSR_ALL_E | FPU_CSR_RM);
fcr31 &= ~(FPU_CSR_FS | FPU_CSR_ALL_E | FPU_CSR_RM);
fcr31 |= value & (FPU_CSR_ALL_E | FPU_CSR_RM);