savefpu
struct savefpu extended_registers;
int npxgetregs(struct thread *td, union savefpu *addr);
void npxsave(union savefpu *addr);
void npxsetregs(struct thread *td, union savefpu *addr);
struct savefpu fpu;
const struct savefpu& extended = state.extended_registers;
savefpu* initialState = ((savefpu*)&sInitialState.user_fpu_state);