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target/s390x: Fix ICM with M3=0

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When the mask is zero, access exceptions should still be recognized for
1 byte at the second-operand address. CC should be set to 0.

Cc: qemu-stable@nongnu.org
Fixes: e023e832d0 ("s390x: translate engine for s390x CPU")
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230724082032.66864-5-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit a2025557ed)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Ilya Leoshkevich 2023-07-24 10:15:57 +02:00 committed by Michael Tokarev
parent 7cf3358451
commit 0ef0b83104
1 changed files with 6 additions and 0 deletions
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6
target/s390x/tcg/translate.c
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@ -2641,6 +2641,12 @@ static DisasJumpType op_icm(DisasContext *s, DisasOps *o)
ccm = ((1ull << len) - 1) << pos;
break;
case 0:
/* Recognize access exceptions for the first byte. */
tcg_gen_qemu_ld_i64(tmp, o->in2, get_mem_index(s), MO_UB);
gen_op_movi_cc(s, 0);
return DISAS_NEXT;
default:
/* This is going to be a sequence of loads and inserts. */
pos = base + 32 - 8;