[PATCH v2 01/14] target/s390x: Make CKSM raise an exception if R2 is odd

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

R2 designates an even-odd register pair; the instruction should raise
a specification exception when R2 is not even.

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 | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
index 6661b27efa4..2f61e879878 100644
--- a/target/s390x/tcg/translate.c
+++ b/target/s390x/tcg/translate.c
@@ -1991,11 +1991,18 @@ static DisasJumpType op_cxlgb(DisasContext *s, DisasOps *o)
 static DisasJumpType op_cksm(DisasContext *s, DisasOps *o)
 {
     int r2 = get_field(s, r2);
-    TCGv_i128 pair = tcg_temp_new_i128();
-    TCGv_i64 len = tcg_temp_new_i64();
+    TCGv_i128 pair;
+    TCGv_i64 len;
+
+    if (r2 & 1) {
+        gen_program_exception(s, PGM_SPECIFICATION);
+        return DISAS_NORETURN;
+    }
 
+    pair = tcg_temp_new_i128();
     gen_helper_cksm(pair, cpu_env, o->in1, o->in2, regs[r2 + 1]);
     set_cc_static(s);
+    len = tcg_temp_new_i64();
     tcg_gen_extr_i128_i64(o->out, len, pair);
 
     tcg_gen_add_i64(regs[r2], regs[r2], len);
-- 
2.41.0