You don't know exactly which code pages will be touched unless you
emulate each instruction.
You can protect the pages you're interested in (e.g. make them not
present), but that requires some
hacking to force EM to go to the recompiler.
Ryan Riley wrote:
I've been staring at that for a while and I think I've realized I may
be trying to go about this the wrong way. Let me try a different
question a different way. I have a list of memory pages that, if
executed from, need to be executed using the recompiler. I want to
ensure that any instructions off of those pages are never run in raw
mode.
The trouble I'm having is determining, before the call to
VMMR3HwAccRunGC(), which instructions may be run in raw mode by that
call. I don't even need it to be exact, I just need to know if one of
the pages in my list has the potential to have code executed off of
it.
Thanks
Ryan
On Nov 8, 2007 5:45 AM, Sander van Leeuwen <[EMAIL PROTECTED]> wrote:
We already have code in place which does exactly that. There are limits
as to how much you can scan though.
See /src/VBox/VMM/PATM/CSAM.cpp, CSAMR3CheckCodeEx. Called before
executing ring 0 code in
raw mode (/src/VBox/VMM/EM.cpp).
Ryan Riley wrote:
I'm doing a small hack on VirtualBox for a local research project and
was hoping someone could point me in the right direction for what I
want to do. Basically, before a piece of guest ring 0 code gets
executed, I want to know what addresses may potentially get run. I
can do this fairly easily by setting pVM->fRawR0Enabled=false and
hacking the recompiler to check each instruction before translating it
(which is what I do now) but for performance reasons I would really
like to scan the code right before execution and let it run natively
if there are no problems. Does anyone have any thoughts on where I
could get started?
Thanks
Ryan
_______________________________________________
vbox-dev mailing list
[email protected]
http://vbox.innotek.de/mailman/listinfo/vbox-dev
--
Kind regards / mit freundlichen Gruessen / Met vriendelijke groet
Sander van Leeuwen
innoTek GmbH
[EMAIL PROTECTED]
http://www.innotek.de
Germany
_______________________________________________
vbox-dev mailing list
[email protected]
http://vbox.innotek.de/mailman/listinfo/vbox-dev
_______________________________________________
vbox-dev mailing list
[email protected]
http://vbox.innotek.de/mailman/listinfo/vbox-dev
--
Kind regards / mit freundlichen Gruessen / Met vriendelijke groet
Sander van Leeuwen
innoTek GmbH
http://www.innotek.de
Germany
_______________________________________________
vbox-dev mailing list
[email protected]
http://vbox.innotek.de/mailman/listinfo/vbox-dev
