[panda-users] Record and Replay

[Brendan Dolan-Gavitt]

Hi,

QEMU requires some command line arguments on ARM that it doesn't on
x86, particularly -kernel as you saw. In replay mode you should be
able to just use -kernel /dev/null. However, you will still have to
specify some command line arguments that match the original recording,
in particular the machine (-M) and amount of memory (-m). For example,
for the squeeze-arm-filetest replay
(http://www.rrshare.org/detail/17/), the command line is:

arm-softmmu/qemu-system-arm -m 128 -replay squeeze-arm-filetest -M
versatilepb -kernel /dev/null

Hope this helps,
Brendan

On Mon, Mar 30, 2015 at 8:20 AM, xiaojuan Li <xiaotan6666 at gmail.com> wrote:
> Hi,
> this seems not to be useful when it applys to qemu-system-arm.
> It just shows "kernel image must be specified"
> How can I use to replay arm?
> Thanks a lot!
>
> 2015-01-30 2:38 GMT+08:00 Leek, Timothy - 0559 - MITLL <tleek at ll.mit.edu>:
>>
>> Manolis & Evan.
>>
>> Generally, we run panda with –replay on the command line in the following
>> manner.
>>
>> qemubinary –replay foo –panda blah blah blah.
>>
>> If you have created a replay (via the qemu monitor) with the command
>> begin_record foo (and later end_record), then you end up with two files,
>>
>> foo-rr-nondet.log
>> foo-rr-snp
>>
>> The -snp is qemu snapshot of ram + regs.
>>
>> The -nondet.log is the log of nondeterministic inputs to the cpu & ram.
>>
>> So you just put the “foo” part after “-replay” on the command line.
>>
>> qemubinary is ARCH-softmmu/qemu-system-ARCH where ARCH is i386, arm, or
>> x86_64
>>
>> You will have to insert -m MEMSIZE after qemubinary if it is other than
>> 128MB.
>>
>> The docs certainly still need work.
>>
>> Tim
>>
>>
>> From:  <Downing>, Evan P <edowning3 at gatech.edu>
>> Date:  Thursday, January 29, 2015 at 11:34 AM
>> To:  Manolis Stamatogiannakis <mstamat at gmail.com>
>> Cc:  "panda-users at mit.edu" <panda-users at mit.edu>
>> Subject:  Re: [panda-users] Record and Replay
>>
>>
>> Oh I see now.
>>
>> I'll go ahead and reword the sentence for grammar's sake.
>>
>>
>> I ended up running the replay function from the command line anyways, but
>> I was wondering how you could do it whilst still in the QEMU monitor
>> console.
>>
>>
>> Thanks a bunch!
>>
>> Evan
>>
>>
>> ________________________________________
>> From: Manolis Stamatogiannakis <mstamat at gmail.com>
>> Sent: Thursday, January 29, 2015 11:20 AM
>> To: Downing, Evan P
>> Cc: panda-users at mit.edu
>> Subject: Re: [panda-users] Record and Replay
>>
>> console -> QEMU monitor console
>>
>>
>> 2015-01-29 17:19 GMT+01:00 Manolis Stamatogiannakis
>> <mstamat at gmail.com>:
>>
>> I'd guess it means you haven't use "stop" command on the console.
>>
>>
>> But this is needed only if you want to start a replay from the console.
>> Usually it is more convenient to launch qemu+panda replay directly from
>> the command line:
>>
>> ./i386-softmmu/qemu-system-i386 -vnc :1 -hda path/to/vmimage.qcow2 -panda
>> 'plugin1;plugin2;plugin3:plugin3_arg1=foo,plugin3_arg2=bar'
>>
>>
>> Cheers,
>> Manolis
>>
>>
>> PS. Maybe a ticket should be opened to add command line replay
>> documentation in
>> record_replay.md <http://record_replay.md>?
>>
>>
>>
>> 2015-01-29 17:08 GMT+01:00 Downing, Evan P <edowning3 at gatech.edu>:
>>
>>
>>
>> Hey guys,
>>
>>
>> I'm attempting to experiment with PANDA's record and replay functionality.
>>
>>
>> On the github page
>> (https://github.com/moyix/panda/blob/master/docs/record_replay.md) you
>> state "Begin
>>  a replay of the session named <name>.
>>  Note that QEMU not must be halted for this to work."
>>
>>
>> Could you please clarify this sentence? (particularly the "QEMU not must
>> be halted" portion)
>>
>>
>> Thanks,
>>
>> Evan
>>
>>
>>
>>
>>
>>
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>
>
>
> --
> wait and hope~~
>
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