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Reverse engineering/tracing a store app with lots of custom code?

infernusdoleo

By infernusdoleo
in Help & Support

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infernusdoleo Newbie

infernusdoleo 0
  •   9 

    • Posted
    • Author
    Posted (edited)

    When you say it will crash my app, do you mean it will crash, or hang?

     

    I'm having a really weird issue now.

     

    Using GDB, got it running. What I'm watching is an 8 byte/64 bit integer. If I do this:

     

    watch *(double *)0x12345678

     

    It never actually catches it. Ever. I know the value is changing, I'm changing it in-app.

     

    So then I ^C and leaving the original watchpoint in, I add:

     

    watch (double *)0x12345678 (notice the lack of the initial *)

     

    I then hit C to continue.

     

    It immediately breaks telling me the value of watchpoint ONE (not the new one) changed.

     

    If I hit continue again, the app freezes and becomes completely unresponsive. If I ^C and delete watchpoint 2, then continue, the app continues to work, and watchpoint 1 stops reporting. If I ^C and re-add the 2nd watchpoint, again, it will immediately break (if the value changed in the meantime) reporting the change (saying it was watchpoint 1 that caught it). Another continue brings us back to hanging.

     

    Really weird.

     

    Any clue? Or should I just go get a cheap macbook today?

    Updated by infernusdoleo
    infernusdoleo Newbie

    infernusdoleo 0
  •   9 

    • Posted
    • Author
    Posted

    Just noticed something that may explain the hang...

     

    When I do an info watch, the 1st watchpoint is hardware. The second just says "watchpoint" - so that may explain the hang, assuming it's software.

     

    But what that doesnt explain is why is the HW watchpoint ignored until I add a software watchpoint?

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