From: David Hildenbrand <david@redhat.com>
Date: Mon, 5 Jul 2021 09:03:41 +0000 (+0200)
Subject: s390x/tcg: Fix m5 vs. m4 field for VECTOR MULTIPLY SUM LOGICAL
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=af4ba0ec8f017c402c239f2888ef62f63770ba8b;p=qemu.git

s390x/tcg: Fix m5 vs. m4 field for VECTOR MULTIPLY SUM LOGICAL

The element size is located in m5, not in m4. As there is no m4, qemu
currently crashes with an assertion, trying to lookup that field.

Reproduced and tested via GO, which ends up using VMSL once the
Vector enhancements facility is around for verifying certificates with
elliptic curves.

Reported-by: Jonathan Albrecht <jonathan.albrecht@linux.vnet.ibm.com>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/449
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Fixes: 8c18fa5b3eba ("s390x/tcg: Implement VECTOR MULTIPLY SUM LOGICAL")
Message-Id: <20210705090341.58289-1-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
---

diff --git a/target/s390x/translate_vx.c.inc b/target/s390x/translate_vx.c.inc
index a9d51b1f4c..0afa46e463 100644
--- a/target/s390x/translate_vx.c.inc
+++ b/target/s390x/translate_vx.c.inc
@@ -1783,7 +1783,7 @@ static DisasJumpType op_vmsl(DisasContext *s, DisasOps *o)
 {
     TCGv_i64 l1, h1, l2, h2;
 
-    if (get_field(s, m4) != ES_64) {
+    if (get_field(s, m5) != ES_64) {
         gen_program_exception(s, PGM_SPECIFICATION);
         return DISAS_NORETURN;
     }