Re: [Qemu-devel] [Bug 1815024] [NEW] SIGILL on instruction "stck" under qemu-s390x in user mode

[Giovanni Mascellani]

Hi, thanks for answering!

Il 07/02/19 11:49, Cornelia Huck ha scritto:
> Did that work before commit 7de3b1cdc67 ("s390x/tcg: properly implement
> the TOD")?

It does not seem so:

$ /qemu-s390x-new -version
qemu-s390x version 2.12.50 (v2.12.0-1983-g7de3b1cdc6-dirty)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
$ /qemu-s390x-new ./a.out
Istruzione non consentita

(i.e., "illegal instruction")

But this might be expected. Now I go to the previous commit (f777b20544)
and recompile:

$ /qemu-s390x-new -version
qemu-s390x version 2.12.50 (v2.12.0-1982-gf777b20544-dirty)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
$ /qemu-s390x-new ./a.out
Istruzione non consentita

So again. And even going back to 76ed4b18de (i.e., skipping a few
apparently related s390x commits):

$ /qemu-s390x-new -version
qemu-s390x version 2.12.50 (v2.12.0-1976-g76ed4b18de-dirty)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
$ /qemu-s390x-new ./a.out
Istruzione non consentita
> stckf will end up at the same helper, so it seems likely to hit the
> same problem.

I guessed so.

Thanks again, Giovanni.
-- 
Giovanni Mascellani <address@hidden>
Postdoc researcher - Université Libre de Bruxelles

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