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target/s390x: implement mvcos instruction

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This adds support for the MOVE WITH OPTIONAL SPECIFICATIONS (MVCOS)
instruction. Allow to enable it for the qemu cpu model using

qemu-system-s390x ... -cpu qemu,mvcos=on ...

This allows to boot linux kernel that uses it for uacccess.

We are missing (as for most other part) low address protection checks,
PSW key / storage key checks and support for AR-mode.

We fake an ADDRESSING exception when called from problem state (which
seems to rely on PSW key checks to be in place) and if AR-mode is used.
user mode will always see a PRIVILEDGED exception.

This patch is based on an original patch by Miroslav Benes (thanks!).

Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170614133819.18480-3-david@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
David Hildenbrand 2017-06-14 15:38:19 +02:00 • committed by Richard Henderson
parent c8bd95377b
commit 3e7e5e0bc1
6 changed files with 201 additions and 15 deletions
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1
target/s390x/cpu_models.c
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@ -682,6 +682,7 @@ static void add_qemu_cpu_model_features(S390FeatBitmap fbm)
S390_FEAT_LONG_DISPLACEMENT_FAST,
S390_FEAT_ETF2_ENH,
S390_FEAT_STORE_CLOCK_FAST,
S390_FEAT_MOVE_WITH_OPTIONAL_SPEC,
S390_FEAT_GENERAL_INSTRUCTIONS_EXT,
S390_FEAT_EXECUTE_EXT,
S390_FEAT_STFLE_45,