On 5/10/12 4:21 PM, "Stephan Diestelhorst"
<[email protected]> wrote:
>Am Montag 07 Mai 2012, 19:57:05 schrieb Hui Kang:
>> More information Š.
>> The code snippet is from ooo-pipe.cpp is
>>
>>
>> if unlikely (isclass(uop.opcode, OPCLASS_BRANCH)) {
>>
>> assert(uop.eom);
>>
>> If the uop is a branch class opcode and it should be set an eom. This
>>looks an exception for this case.
>> Any comment?
>
>Hi Hui,
> maybe you should also post this on the Marss86 mailing list. It
>would be interesting which instruction actually triggered the fault.
>You can either do an objdump of the right binary (library / kernel it
>seems?) or (at least that is the way it works in PTLsim) use the
>-ringbuf to log the ROB's content and then browse backwards through
>the log and see which uops were decoded.
Thanks for reminding me (I have not realized that I posted to PLTsim
mailing list, instead of marssX86). As I posted there, I hope I can get
more response then.
>
>This certainly looks like a decoder problem, did you tweak anything
>there? The unknown opcode is just an artefact of the assertion. That
>is the way simulation is brought to a rather immediate halt.
I did not tweak anything in the marssx86 code. The assert stops the
simulation immediately.
- Hui
>
>Stephan
>
>>
>> - Hui
>>
>> From: Hui Kang <[email protected]<mailto:[email protected]>>
>> Date: Mon, 7 May 2012 18:22:08 +0000
>> To: "[email protected]<mailto:[email protected]>"
>><[email protected]<mailto:[email protected]>>
>> Subject: [PTLsim-devel] crash when simulating a fedora 14 os
>>
>> Hi,
>> I am using marssx86 to run a fedora 14 os. After I boot the machine and
>>start the simulation from the QEMU monitor, the VM exits with some error
>>message.
>>
>> Completed 321000 cycles, 152247 commits: 192571 Hz,
>> 226715
>> Completed 395000 cycles, 192288 commits: 368144 Hz,
>> 199200
>> Completed 509000 cycles, 219744 commits: 564596 Hz,
>> 135978
>> Completed 564000 cycles, 263019 commits: 274601 Hz,
>> 216061
>> Completed 607000 cycles, 309815 commits: 212271 Hz,
>> 231010 insns/sec: rip ffffffff811c2305qemu-system-x86_64:
>>ptlsim/build/core/ooo-core/ooo-pipe.cpp:2131: int
>>ooo::ReorderBufferEntry::commit(): Assertion `uop.eom' failed.
>>
>> I did a quick search online and find this maybe caused by an
>>unsupported opcode, but I am not sure about the cause.
>> Could anyone tell me how to debug this error message or find the
>>unsupported opcode? Thanks.
>>
>> - Hui
>>
>> _______________________________________________ ptlsim-devel mailing
>>list [email protected]<mailto:[email protected]>
>>http://www.ptlsim.org/mailman/listinfo/ptlsim-devel
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