[Qemu-devel] QEMU-Based Android Emulator

[Qemu-devel] QEMU-Based Android Emulator

[Marinos Tsantekidis]

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Hi to all! I'm looking to extract some info from QEMU used by Android
Emulator. I want to add some printf s to the source code. How do I do that?
How do I recompile the source in order for the changes to take effect?
Please help!!

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Re: [Qemu-devel] QEMU-Based Android Emulator

[Andreas Färber]

Hi,

Am 03.02.2014 18:45, schrieb Marinos Tsantekidis:
> Hi to all! I'm looking to extract some info from QEMU used by Android
> Emulator. I want to add some printf s to the source code. How do I do
> that? How do I recompile the source in order for the changes to take
> effect? Please help!!

Please see our Wiki for info on compiling QEMU:

http://wiki.qemu.org/Documentation/GettingStartedDevelopers

Adding printf()s to device emulation code is trivial and works like in
any other C code. For instruction-level tracing it's less easy, you can
only add printf()s during translation time, but not generally for
execution tracing.

If you want information specifically on the Android emulator, you'll
have to ask elsewhere since we don't maintain that.

Regards,
Andreas

-- 
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg

Re: [Qemu-devel] QEMU-Based Android Emulator

[Marinos Tsantekidis]

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Maybe I'm not specific enough. I built Android from the source code and I
know that the Android Emulator that comes with it, is based on QEMU. I
don't want anything from Android. What I'm interested in is the underlying
QEMU. I want to see how the program counter changes during translation. To
my understanding, in the file target-arm/translate.c
there are cases, each one for a different ARM instruction to be translated
(write, store, branch etc.). I also know that for optimization purposes,
the program counter changes only after a branch instruction. So, if and
when I print the program counter, I expect to see it change only after a
"branch" and remain unchanged after any other instruction. To sum up, I
want to add printf()s to the source code of QEMU beneath the Android
Emulator to see how the program counter behaves. I'm asking how do I do
that. How do I recompile the source? How and where do I see the printed
information? Please, it's very important.


2014-02-04 Andreas Färber <afaerber@suse.de>:

> Hi,
>
> Am 03.02.2014 18:45, schrieb Marinos Tsantekidis:
> > Hi to all! I'm looking to extract some info from QEMU used by Android
> > Emulator. I want to add some printf s to the source code. How do I do
> > that? How do I recompile the source in order for the changes to take
> > effect? Please help!!
>
> Please see our Wiki for info on compiling QEMU:
>
> http://wiki.qemu.org/Documentation/GettingStartedDevelopers
>
> Adding printf()s to device emulation code is trivial and works like in
> any other C code. For instruction-level tracing it's less easy, you can
> only add printf()s during translation time, but not generally for
> execution tracing.
>
> If you want information specifically on the Android emulator, you'll
> have to ask elsewhere since we don't maintain that.
>
> Regards,
> Andreas
>
> --
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
>

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