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Synchronize two running qemu emulations

This is a small python script to synchronize two running gdb instances. The emulation will single step on both instances and then exchange register values over a socket connection. If the values differ the emulation will stop.

This script is currently written for arm32 emulation but can probably be adapted for other architectures as well.

Install

Requires a gdb installation that was compiled with python3 support.

  • Download sync_bridge.py.
  • Start both gdb instances and source the plug in with source /path/to/sync_bridge.py.
  • Initialize the plug in with: sb_init on both gdb instances.

Run

It is recommended to continue the emulation on both gdb instances to a point where they are in the same state. On one of the emulation call sb_lead and afterwards call sb_follow on the other gdb instance. The emulation should now continue until a difference is detected.