(ddd.info)Machine Code Execution

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8.2 Machine Code Execution
==========================

All execution facilities available in the source code window are
available in the machine code window as well.  Two special facilities
are convenient for machine-level debugging:

   To execute just one machine instruction, click on the `Stepi' button
or select `Program => Step Instruction'.

   To continue to the next instruction in the current function, click on
the `Nexti' button select `Program => Next Instruction'..  This is
similar to `Stepi', but any subroutine calls are executed without
stopping.

   Using GDB, it is often useful to do

     graph display /i $pc

when stepping by machine instructions.  This makes DDD automatically
display the next instruction to be executed, each time your program
stops.