X86_EFLAGS_DIRECTION
| X86_EFLAGS_DIRECTION | X86_EFLAGS_OVERFLOW)
frame->flags &= ~(X86_EFLAGS_TRAP | X86_EFLAGS_DIRECTION);
x86_write_msr(IA32_MSR_FMASK, X86_EFLAGS_INTERRUPT | X86_EFLAGS_DIRECTION
frame->flags &= ~(uint64)(X86_EFLAGS_TRAP | X86_EFLAGS_DIRECTION);