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Date: Thu, 21 Apr 2011 23:45:58 +0400
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From: Igor Kovalenko <igor.v.kovalenko@gmail.com>
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Subject: Re: [Qemu-devel] tcg/tcg.c:1892: tcg fatal error
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To: Laurent Desnogues <laurent.desnogues@gmail.com>
Cc: Blue Swirl <blauwirbel@gmail.com>, peter.maydell@linaro.org, Aurelien Jarno <aurelien@aurel32.net>, qemu-devel <qemu-devel@nongnu.org>, Artyom Tarasenko <atar4qemu@gmail.com>

On Thu, Apr 21, 2011 at 7:44 PM, Laurent Desnogues
<laurent.desnogues@gmail.com> wrote:
> On Thu, Apr 21, 2011 at 4:57 PM, Artyom Tarasenko <atar4qemu@gmail.com> wrote:
>> On Tue, Apr 12, 2011 at 4:14 AM, Igor Kovalenko
>> <igor.v.kovalenko@gmail.com> wrote:
>>>>> Do you have public test case?
>>>>> It is possible to code this delay slot write test but real issue may
>>>>> be corruption elsewhere.
>>
>> The test case is trivial: it's just the two instructions, branch and wrpr.
>>
>>> In theory there could be multiple issues including compiler induced ones.
>>> I'd prefer to see some kind of reproducible testcase.
>>
>> Ok, attached a 40 byte long test (the first 32 bytes are not used and
>> needed only because the bios entry point is 0x20).
>>
>> $ git pull && make && sparc64-softmmu/qemu-system-sparc64 -bios
>> test-wrpr.bin -nographic
>> Already up-to-date.
>> make[1]: Nothing to be done for `all'.
>> /mnt/terra/projects/vanilla/qemu/tcg/tcg.c:1892: tcg fatal error
>> Aborted
>
> The problem seems to be that wrpr is using a non-local
> TCG tmp (cpu_tmp0).

Just tried the test case with write to %pil - seems like write itself is OK.
The issue appears to be with save_state() call since adding save_state
to %pil case provokes the same tcg abort.

-- 
Kind regards,
Igor V. Kovalenko