: poletaev
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] improve emulation correctness
On Thu, Apr 24, 2014 at 12:35:24PM +0400, poletaev wrote:
> There is a set of test, that checks QEMU CPU for similar behavior with
> real hardware (http://roberto.greyhats.it/projects/pill
On Thu, Apr 24, 2014 at 12:35:24PM +0400, poletaev wrote:
> There is a set of test, that checks QEMU CPU for similar behavior with real
> hardware (http://roberto.greyhats.it/projects/pills.html). Test
> reg/pill2579.c can detect, that program is execute in emulated environment.
> It is related wit
On Thu, Apr 24, 2014 at 12:35:24PM +0400, poletaev wrote:
The commit message is vague so I guess the maintainers skipped your
email. I have CCed Paolo, Richard, and Andreas who may be able to
review and apply your patch.
Please make the commit message more specific:
target-i386: don't touch und
On 04/28/2014 07:32 AM, Dmitry Poletaev wrote:
> I'm understand your position.
>
> But why in TCG undefined flags obviously change to zero in some cases?
> For example:
> af = 0; /* undefined */
>
> It is not a part of Intel specification, what reason was apply that
> convention?
Because it's
On 04/28/2014 06:05 AM, Dmitry Poletaev wrote:
> -env->cc_src = (eflags & ~(CC_C | CC_O)) |
> -(lshift(src ^ t0, 11 - (DATA_BITS - 1)) & CC_O) |
> +env->cc_src = (eflags & ~CC_C) |
> ((src >> (DATA_BITS - count)) & CC_C);
> +if (count == 1) {
> +
I'm understand your position.
But why in TCG undefined flags obviously change to zero in some cases?
For example:
af = 0; /* undefined */
It is not a part of Intel specification, what reason was apply that convention?
28.04.2014, 17:49, "Peter Maydell" :
> On 28 April 2014 14:41, Dmitry Poleta
On 28 April 2014 14:41, Dmitry Poletaev wrote:
> Let's imagine we analyse a program(may be a malware) and so
> run it in emulator. Malware can execute that test and understand
> that it run in an emulator. After that malware can make decision,
> that someone analyse it and alter its behavior with
27.04.2014, 20:59, "Peter Maydell" :
> On 27 April 2014 17:46, Michael Tokarev wrote:
>> 25.04.2014 21:24, Peter Maydell wrote:
>>> It is always going to be possible to determine that you're
>>> running on an emulator rather than real hardware, so changing
>>> QEMU behaviour just for thi
25.04.2014, 21:09, "Richard Henderson" :
> On 04/25/2014 01:13 AM, Dmitry Poletaev wrote:
>> There is a set of test, that checks QEMU CPU for similar behavior with
>> real hardware (http://roberto.greyhats.it/projects/pills.html). Test
>> reg/pill2579.c can detect, that program is execute in
On 27 April 2014 17:46, Michael Tokarev wrote:
> 25.04.2014 21:24, Peter Maydell wrote:
>> It is always going to be possible to determine that you're
>> running on an emulator rather than real hardware, so changing
>> QEMU behaviour just for this is uninteresting. If QEMU
>> behaves differently fr
25.04.2014 21:24, Peter Maydell wrote:
> On 25 April 2014 09:13, Dmitry Poletaev wrote:
>
>> Emulated program can execute that test and after that
>> can understand environment not real.
>
> It is always going to be possible to determine that you're
> running on an emulator rather than real hard
On 04/24/2014 02:35 AM, poletaev wrote:
> There is a set of test, that checks QEMU CPU for similar behavior with real
> hardware (http://roberto.greyhats.it/projects/pills.html). Test
> reg/pill2579.c can detect, that program is execute in emulated environment.
> It is related with behavior of rcl
On 25 April 2014 09:13, Dmitry Poletaev wrote:
> There is a set of test, that checks QEMU CPU for similar behavior with real
> hardware (http://roberto.greyhats.it/projects/pills.html). Test
> reg/pill2579.c can detect, that program is execute in emulated environment.
> It is related with behav
There is a set of test, that checks QEMU CPU for similar behavior with real
hardware (http://roberto.greyhats.it/projects/pills.html). Test
reg/pill2579.c can detect, that program is execute in emulated environment.
It is related with behavior of rcl instruction. If the number of shifted
bits more
On 04/25/2014 01:13 AM, Dmitry Poletaev wrote:
> There is a set of test, that checks QEMU CPU for similar behavior with real
> hardware (http://roberto.greyhats.it/projects/pills.html). Test
> reg/pill2579.c can detect, that program is execute in emulated environment.
> It is related with behavi
There is a set of test, that checks QEMU CPU for similar behavior with real
hardware (http://roberto.greyhats.it/projects/pills.html). Test reg/pill2579.c
can detect, that program is execute in emulated environment. It is related with
behavior of rcl instruction. If the number of shifted bits mo
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