[Qemu-devel] Dynamic Binary Instrumentation

[Qemu-devel] Dynamic Binary Instrumentation

[Lluís Vilanova]

Hi there,

Given that right now I don't have enough time to write the paper that should
accompany this work, I've decided to open it up so that whoever is interested
can have access to it.

You can get some instructions here:

  https://projects.gso.ac.upc.edu/projects/qemu-dbi/wiki

Code is split in different patch series, and I've tried to make it as painlessly
as possible to add new events, as well as tried to have the current ones be as
less intrusive as possible on the existing code.

The optimal outcome would be to integrate the added infrastructure upstream, so
that people can benefit from it out of the box, but I'm sure this will take some
iterations (if it's ever accepted).

Missing:
  * Code has not been rebased on the latest QEMU version (I've a local branch
    where I started porting it to per-directory makefiles).
  * Some of features I have locally are not yet published in that repo.
  * Some commit messages and series covers need to be rewritten to reflect the
    current state of the code.
  * Some code needs polishing.


Happy hacking,
  Lluis

-- 
 "And it's much the same thing with knowledge, for whenever you learn
 something new, the whole world becomes that much richer."
 -- The Princess of Pure Reason, as told by Norton Juster in The Phantom
 Tollbooth

Re: [Qemu-devel] Dynamic Binary Instrumentation

[陳韋任 (Wei-Ren Chen)]

Hi Liuis,

On Tue, Sep 04, 2012 at 10:08:09PM +0200, Lluís Vilanova wrote:
> Hi there,
> 
> Given that right now I don't have enough time to write the paper that should
> accompany this work, I've decided to open it up so that whoever is interested
> can have access to it.
> 
> You can get some instructions here:
> 
>   https://projects.gso.ac.upc.edu/projects/qemu-dbi/wiki

  The website is down. :/ Would you like to take a look on that?
Thanks.

Regards,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj

Re: [Qemu-devel] Dynamic Binary Instrumentation

[Lluís Vilanova]

Sorry, it's up again. The server is low on RAM and Linux' OOM killer kicks in
sometimes.

Lluis


陳韋任 (Wei-Ren Chen) writes:

> Hi Liuis,
> On Tue, Sep 04, 2012 at 10:08:09PM +0200, Lluís Vilanova wrote:
>> Hi there,
>> 
>> Given that right now I don't have enough time to write the paper that should
>> accompany this work, I've decided to open it up so that whoever is interested
>> can have access to it.
>> 
>> You can get some instructions here:
>> 
>> https://projects.gso.ac.upc.edu/projects/qemu-dbi/wiki

>   The website is down. :/ Would you like to take a look on that?
> Thanks.

> Regards,
> chenwj

> -- 
> Wei-Ren Chen (陳韋任)
> Computer Systems Lab, Institute of Information Science,
> Academia Sinica, Taiwan (R.O.C.)
> Tel:886-2-2788-3799 #1667
> Homepage: http://people.cs.nctu.edu.tw/~chenwj

-- 
 "And it's much the same thing with knowledge, for whenever you learn
 something new, the whole world becomes that much richer."
 -- The Princess of Pure Reason, as told by Norton Juster in The Phantom
 Tollbooth

Re: [Qemu-devel] Dynamic Binary Instrumentation

[陳韋任 (Wei-Ren Chen)]

[-- Attachment #1: Type: text/plain, Size: 838 bytes --]

On Fri, Sep 21, 2012 at 03:39:32PM +0200, Lluís Vilanova wrote:
> Sorry, it's up again. The server is low on RAM and Linux' OOM killer kicks in
> sometimes.

  Thanks. I am playing around your qemu-dbi, and has error below.

$ make
  LINK  i386-softmmu/qemu-system-i386
translate.o: In function `trace_tcg_instr__before':
/tmp/chenwj/qemu-dbi/trace/tcg-instr-internal.h:134: undefined reference to `trace_tcg_vbbl_before'

Seems some files or functions are missing? Also, do you consider
move your repo to github or other more reliable server?

Regards,
chenwj 

P.S. Attach is a minor patch which fix a typo (I guess).

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj

[-- Attachment #2: qemu-dbi.patch --]
[-- Type: text/x-diff, Size: 737 bytes --]

diff --git a/docs/instrumentation.txt b/docs/instrumentation.txt
index 58ce4cb..c2e79b0 100644
--- a/docs/instrumentation.txt
+++ b/docs/instrumentation.txt
@@ -39,7 +39,7 @@ property, if any) in the events listed in the "trace-events" file.
 In order to avoid modifying the QEMU sources, you can simply create a new
 trace-events file with your modifications:
 
-    cp /path/to/qemu-source/ /tmp/trace-events
+    cp /path/to/qemu-source/trace-events /tmp/trace-events
     sed -i -e "s/qemu_vmalloc(/instrument qemu_vmalloc(/g" /tmp/trace-events
     sed -i -e "s/disable tcg vbbl_before(/instrument tcg vbbl(/g" /tmp/trace-events
     sed -i -e "s/disable tcg vinstr_before_before(/instrument tcg vinstr_before(/g" /tmp/trace-events

Re: [Qemu-devel] Dynamic Binary Instrumentation

[Lluís Vilanova]

陳韋任 (Wei-Ren Chen) writes:

> On Fri, Sep 21, 2012 at 03:39:32PM +0200, Lluís Vilanova wrote:
>> Sorry, it's up again. The server is low on RAM and Linux' OOM killer kicks in
>> sometimes.

>   Thanks. I am playing around your qemu-dbi, and has error below.

> $ make
>   LINK  i386-softmmu/qemu-system-i386
> translate.o: In function `trace_tcg_instr__before':
> /tmp/chenwj/qemu-dbi/trace/tcg-instr-internal.h:134: undefined reference to `trace_tcg_vbbl_before'

How did you configure it?

After applying a small build patch, this works for me:

  cp ~/qemu-dbi/trace-events ~/
  sed -i -e "s/disable tcg vmem(/instrument tcg vmem(/g" trace-events
  mkdir -p ~/qemu-dbi-build
  cd ~/qemu-dbi-build
  ~/qemu-src/configure --with-trace-events=../trace-events --with-trace-instrument=dynamic --prefix=/tmp/qemu-install --enable-trace-backend=stderr --target-list="i386-softmmu"
  make
  make install

I've update the repo with the aforementioned patch.


> Seems some files or functions are missing? Also, do you consider
> move your repo to github or other more reliable server?

I might do it in the future, but for now my todo is full enough with other
tasks :)



> P.S. Attach is a minor patch which fix a typo (I guess).

Right, I should proofread the docs.



Thanks,
  Lluis

-- 
 "And it's much the same thing with knowledge, for whenever you learn
 something new, the whole world becomes that much richer."
 -- The Princess of Pure Reason, as told by Norton Juster in The Phantom
 Tollbooth