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How to print what I want after stepi and nexti in gdb?

I'm running the stepi and nexti commands in GDB. Currently they print the address like this:

(gdb) stepi
0x08043ae7 in ?? ()
(gdb) nexti
0x08043ae8 in ?? ()

Instead of that, I'd like to get the current instruction printed:

(gdb) stepi
=> 0x8043ae7:   push   %eax
(gdb) nexti
=> 0x8043ae8:   push   %ebx

I know that I can get the desired lines by running x/i $pc. How do I get them automatically after stepi and nexti?

Solution

  • How do I get them automatically after stepi and nexti?

    This will do almost what you want:

    (gdb) display/i $pc

    The difference is that it will display the next instruction every time GDB stops, not just after stepi and nexti.

    You should also be able to use hook-nexti and hook-stepi if you really want the x/i to only fire for these two commands. Documentation.