[Qemu-devel] Saving and restoring CPU state

[eady <eady@wisc.edu>]

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I'm still looking for any suggestions on how to save and restore the 
target cpu state from within a custom instruction in op.c. I basically 
want a custom instruction to save the cpu state to a data structure and 
then continue on normally, a second custom instruction would then be 
used to restore the cpu state from the saved data structure at a later 
time thereby rolling back the execution of the cpu. I've tried saving 
and restoring env->eip within my custom instructions but this has no effect.

Thanks,
Nuri

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From: eady <eady@wisc.edu>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Saving and restoring CPU state
Date: Sun, 08 Apr 2007 16:38:14 -0500
Message-ID: <461960C6.8010904@wisc.edu>

I'm experimenting a bit with QEMU and am in need of a way to save and 
restore X86 CPU state including the pc so that the processor state can 
be rolled back to re execute from the previous point. I've found the 
functions "cpu_x86_fsave" and "cpu_restore_state" but do not understand 
them well enough to use them. Does anyone have tips on how to store the 
processor state in an auxiliary data structure and then restore it at a 
later point?

Thanks
Nuri