[PATCH 3/4] target/s390x: Fix LAALG not updating cc_src

[Ilya Leoshkevich]

LAALG uses op_laa() and cout_addu64(). The latter expects cc_src to be
set, but the former does not do it. This can lead to assertion failures
if something sets cc_src to neither 0 nor 1 before.

Fix by setting cc_src in op_laa().

Fixes: 4dba4d6fef61 ("target/s390x: Use atomic operations for LOAD AND OP")
Cc: qemu-stable@nongnu.org
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 target/s390x/tcg/translate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c
index a0d6a2a35dd..db386ea94d8 100644
--- a/target/s390x/tcg/translate.c
+++ b/target/s390x/tcg/translate.c
@@ -2684,7 +2684,8 @@ static DisasJumpType op_laa(DisasContext *s, DisasOps *o)
     tcg_gen_atomic_fetch_add_i64(o->in2, o->in2, o->in1, get_mem_index(s),
                                  s->insn->data | MO_ALIGN);
     /* However, we need to recompute the addition for setting CC.  */
-    tcg_gen_add_i64(o->out, o->in1, o->in2);
+    tcg_gen_movi_i64(cc_src, 0);
+    tcg_gen_add2_i64(o->out, cc_src, o->in1, cc_src, o->in2, cc_src);
     return DISAS_NEXT;
 }
 
-- 
2.41.0