[PATCH v2 04/14] target/s390x: Fix ICM with M3=0

[Ilya Leoshkevich <iii@linux.ibm.com>]

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: e023e832d0ac ("s390x: translate engine for s390x CPU")
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 target/s390x/tcg/translate.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
index 2f61e879878..2f193339709 100644
--- a/target/s390x/tcg/translate.c
+++ b/target/s390x/tcg/translate.c
@@ -2522,6 +2522,12 @@ 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;
-- 
2.41.0