target/s390x: Do not modify cpu state in s390_cpu_get_psw_mask

We want to use this function for debugging, and debug should
not modify cpu state (even non-architectural cpu state) lest
we introduce heisenbugs.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Tested-by: jonathan.albrecht <jonathan.albrecht@linux.vnet.ibm.com>
Tested-by: <ruixin.bao@ibm.com>
Message-Id: <20210615030744.1252385-3-richard.henderson@linaro.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

diff --git a/target/s390x/helper.c b/target/s390x/helper.c
index d311903b94ca9492a6d68531e2339da652e552e6..559fc3573fe3608c2266a4b7dcb2d8bfb6b467f2 100644 (file)
--- a/target/s390x/helper.c
+++ b/target/s390x/helper.c
@@ -321,12 +321,12 @@ uint64_t s390_cpu_get_psw_mask(CPUS390XState *env)
     uint64_t r = env->psw.mask;
 
     if (tcg_enabled()) {
-        env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst,
-                             env->cc_vr);
+        uint64_t cc = calc_cc(env, env->cc_op, env->cc_src,
+                              env->cc_dst, env->cc_vr);
 
+        assert(cc <= 3);
         r &= ~PSW_MASK_CC;
-        assert(!(env->cc_op & ~3));
-        r |= (uint64_t)env->cc_op << 44;
+        r |= cc << 44;
     }
 
     return r;