[Qemu-devel] Debug single program in QEMU

[Qemu-devel] Debug single program in QEMU

[Yue Chen]

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Hi!~

Now I'd like to see what the micro-ops (intermediate operations generated
by TCG) of a single Linux or Windows program, any approach to do this under
QEMU? Thanks.

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Re: [Qemu-devel] Debug single program in QEMU

[Mulyadi Santosa]

On Thu, Mar 15, 2012 at 09:12, Yue Chen <ycyc321@gmail.com> wrote:
> Hi!~
>
> Now I'd like to see what the micro-ops (intermediate operations generated by
> TCG) of a single Linux or Windows program, any approach to do this under
> QEMU? Thanks.

are you referring to you Qemu system emulation or Qemu user mode?

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com

Re: [Qemu-devel] Debug single program in QEMU

[陳韋任]

On Thu, Mar 15, 2012 at 01:26:44PM +0700, Mulyadi Santosa wrote:
> On Thu, Mar 15, 2012 at 09:12, Yue Chen <ycyc321@gmail.com> wrote:
> > Hi!~
> >
> > Now I'd like to see what the micro-ops (intermediate operations generated by
> > TCG) of a single Linux or Windows program, any approach to do this under
> > QEMU? Thanks.
> 
> are you referring to you Qemu system emulation or Qemu user mode?

  Does that matter? I think "-d op" should be enough, right?

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] Debug single program in QEMU

[Yue Chen]

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But it is hard to localize a specific program instead of lots of logs.
On Mar 15, 2012 4:14 AM, "陳韋任" <chenwj@iis.sinica.edu.tw> wrote:

> On Thu, Mar 15, 2012 at 01:26:44PM +0700, Mulyadi Santosa wrote:
> > On Thu, Mar 15, 2012 at 09:12, Yue Chen <ycyc321@gmail.com> wrote:
> > > Hi!~
> > >
> > > Now I'd like to see what the micro-ops (intermediate operations
> generated by
> > > TCG) of a single Linux or Windows program, any approach to do this
> under
> > > QEMU? Thanks.
> >
> > are you referring to you Qemu system emulation or Qemu user mode?
>
>  Does that matter? I think "-d op" should be enough, right?
>
> 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
>

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Re: [Qemu-devel] Debug single program in QEMU

[陳韋任]

  O.K., then. You must specify which mode you're running, user mode or system
mode? User mode shouldn't have the issue you described. For system mode, I have
no good idea on how to track a specific program running on the guest OS.

On Thu, Mar 15, 2012 at 09:40:48AM -0400, Yue Chen wrote:
> But it is hard to localize a specific program instead of lots of logs.
> On Mar 15, 2012 4:14 AM, "陳韋任" <chenwj@iis.sinica.edu.tw> wrote:
> 
> > On Thu, Mar 15, 2012 at 01:26:44PM +0700, Mulyadi Santosa wrote:
> > > On Thu, Mar 15, 2012 at 09:12, Yue Chen <ycyc321@gmail.com> wrote:
> > > > Hi!~
> > > >
> > > > Now I'd like to see what the micro-ops (intermediate operations
> > generated by
> > > > TCG) of a single Linux or Windows program, any approach to do this
> > under
> > > > QEMU? Thanks.
> > >
> > > are you referring to you Qemu system emulation or Qemu user mode?
> >
> >  Does that matter? I think "-d op" should be enough, right?

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] Debug single program in QEMU

[Yue Chen]

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So how to run a Windows program or Linux program under user mode ? I cannot
find useful documentations. Many thanks.

2012/3/15 陳韋任 <chenwj@iis.sinica.edu.tw>

>  O.K., then. You must specify which mode you're running, user mode or
> system
> mode? User mode shouldn't have the issue you described. For system mode, I
> have
> no good idea on how to track a specific program running on the guest OS.
>
> On Thu, Mar 15, 2012 at 09:40:48AM -0400, Yue Chen wrote:
> > But it is hard to localize a specific program instead of lots of logs.
> > On Mar 15, 2012 4:14 AM, "陳韋任" <chenwj@iis.sinica.edu.tw> wrote:
> >
> > > On Thu, Mar 15, 2012 at 01:26:44PM +0700, Mulyadi Santosa wrote:
> > > > On Thu, Mar 15, 2012 at 09:12, Yue Chen <ycyc321@gmail.com> wrote:
> > > > > Hi!~
> > > > >
> > > > > Now I'd like to see what the micro-ops (intermediate operations
> > > generated by
> > > > > TCG) of a single Linux or Windows program, any approach to do this
> > > under
> > > > > QEMU? Thanks.
> > > >
> > > > are you referring to you Qemu system emulation or Qemu user mode?
> > >
> > >  Does that matter? I think "-d op" should be enough, right?
>
> 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
>

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Re: [Qemu-devel] Debug single program in QEMU

[陳韋任]

  http://qemu.weilnetz.de/qemu-doc.html#QEMU-User-space-emulator

On Thu, Mar 15, 2012 at 10:42:02PM -0400, Yue Chen wrote:
> So how to run a Windows program or Linux program under user mode ? I cannot
> find useful documentations. Many thanks.

-- 
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] Debug single program in QEMU

[Yue Chen]

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Hi,

Could you tell me what kind of programs can be emulated in user-mode of
QEMU ?

It seems that only limited programs can be emulated in user-mode, like
/bin/ls, and with warning. A lot of other programs cannot be emulated, like
GUI programs, browser, etc.

Additionally, why so many instructions come out when I use  " -d in_asm "
to log? It's hard to find the real instructions of that single program...
Thanks.

2012/3/15 陳韋任 <chenwj@iis.sinica.edu.tw>

>  http://qemu.weilnetz.de/qemu-doc.html#QEMU-User-space-emulator
>
> On Thu, Mar 15, 2012 at 10:42:02PM -0400, Yue Chen wrote:
> > So how to run a Windows program or Linux program under user mode ? I
> cannot
> > find useful documentations. Many thanks.
>
>  --
> 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
>

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Re: [Qemu-devel] Debug single program in QEMU

[陳韋任]

> Could you tell me what kind of programs can be emulated in user-mode of
> QEMU ?

  Use-mode can emulate programs compiled for different ISA but with same OS.

> It seems that only limited programs can be emulated in user-mode, like
> /bin/ls, and with warning. A lot of other programs cannot be emulated, like
> GUI programs, browser, etc.

  Currently, I only emulate command line programs, i.e., something like `/bin/ls`.
I am curious about running /bin/ls with warning in your case. Can you elaborate
on what your enviroment is? For example, what version of QEMU you're using, how
you run the example program, and what kind of warning you have. I don't know
QEMU can/cannot deal with GUI, but I think it should. You can also give us an
example on that.
 
> Additionally, why so many instructions come out when I use  " -d in_asm "
> to log? It's hard to find the real instructions of that single program...

  You have to know that even a simple helloworld contains many instructions
than you thought (dynamic linker, for example). My suggestion is using
`objdump` at the same time to locate the function you're interested in, then
look into the log.

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] Debug single program in QEMU

[Yue Chen]

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Hi, thanks again for your reply.

It seems that, from the instruction log, we can find out "*which
instructions   belong to   which process(task)*"  according to CR3 register.


2012/3/15 陳韋任 <chenwj@iis.sinica.edu.tw>

>  O.K., then. You must specify which mode you're running, user mode or
> system
> mode? User mode shouldn't have the issue you described. For system mode, I
> have
> no good idea on how to track a specific program running on the guest OS.
>
> On Thu, Mar 15, 2012 at 09:40:48AM -0400, Yue Chen wrote:
> > But it is hard to localize a specific program instead of lots of logs.
> > On Mar 15, 2012 4:14 AM, "陳韋任" <chenwj@iis.sinica.edu.tw> wrote:
> >
> > > On Thu, Mar 15, 2012 at 01:26:44PM +0700, Mulyadi Santosa wrote:
> > > > On Thu, Mar 15, 2012 at 09:12, Yue Chen <ycyc321@gmail.com> wrote:
> > > > > Hi!~
> > > > >
> > > > > Now I'd like to see what the micro-ops (intermediate operations
> > > generated by
> > > > > TCG) of a single Linux or Windows program, any approach to do this
> > > under
> > > > > QEMU? Thanks.
> > > >
> > > > are you referring to you Qemu system emulation or Qemu user mode?
> > >
> > >  Does that matter? I think "-d op" should be enough, right?
>
> 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
>

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