4. Hello, World, step-by-step, Cont.

• OllyDbg breakpoint is reached:

   

• How does the console app handle character output?

• OllyDbg makes the answer easy:

  1. Open call stack window by clicking View -> Call stack (or simply Alt+K.)

  2. Optional: Open run trace window by clicking View -> Run trace.

  3. Click Debug -> Trace into (Ctrl+F11). The program resumes.

  4. The execution stops prior to the first encountered SYSENTER instruction,

      

     and the call stack looks like this: