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Setting a BP and pulling thread context

 
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Burningmace
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PostPosted: Sun Oct 14, 2018 6:14 am    Post subject: Setting a BP and pulling thread context Reply with quote
I've got a case where it'd be very useful to have the Lua script set a BP on a particular instruction found via aobscan, then pull the thread context and extract a particular register value. Is this possible, or do I need to go the route of injecting a code cave and copying the register value to a known memory address that can be read back out?
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TheyCallMeTim13
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PostPosted: Sun Oct 14, 2018 7:00 am    Post subject: Reply with quote
Not sure about the thread context, but you can use "debug_setBreakpoint" and "debugger_onBreakpoint", and there is "debug_setContext" but I have never used it.
https://wiki.cheatengine.org/index.php?title=Lua#Debugger

https://wiki.cheatengine.org/index.php?title=Lua:debug_setBreakpoint
https://wiki.cheatengine.org/index.php?title=Lua:debugger_onBreakpoint
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atom0s
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PostPosted: Sun Oct 14, 2018 12:52 pm    Post subject: This post has 1 review(s) Reply with quote
The 'context' is set to globals when debugger_onBreakpoint is called.

Code:

 When a breaking breakpoint hits (that includes single stepping) and the lua function debugger_onBreakpoint() is defined it will be called and the global variables EAX, EBX, .... will be filled in
 Return 0 if you want the userinterface to be updated and anything else if not (e.g You continued from the breakpoint in your script)


So you can directly access the registers as globals in Lua.
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Burningmace
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PostPosted: Sun Oct 14, 2018 5:36 pm    Post subject: Reply with quote
Oh, perfect, thanks!
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