Hello,
I am attempting to instrument branch instructions in a program in gem5.
So far, I have code in AtomicSimpleCPU which determines when branch
instructions are executed. For every branch, I would like to call an
instrumentation function and then return to execution of the simulated
program. This would be fairly simple, but I would like to execute the
instrumentation function within the simulator, so the instrumentation
time is taken into account on the simulator statistics.
Is it possible to do something like this? Any ideas on how to do this?
The function could be compiled in with the program, so we might be able
to instrument by manually setting up arguments and changing the PC to
the instrumentation function. Another idea I had would be to have two
thread contexts for one CPU with one running the application and one
doing instrumentation, and switching between them as needed. Is this
sort of thing possible; is there any simulation time used by thread
context switches?
Thanks,
David G.
--
David Gloe
gloex...@umn.edu da...@cs.umn.edu dcg...@gmail.com
Masters Student, Computer Science
University of Minnesota
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