target/arm: Fix SME vs AdvSIMD exception priority

We failed to raise an exception when
sme_excp_el == 0 and fp_excp_el == 1.

Cc: [email protected]
Fixes: 3d74825 ("target/arm: Add SME enablement checks")
Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
Message-id: [email protected]
Signed-off-by: Peter Maydell <[email protected]>
(cherry picked from commit f9b0f69304071384b12912bf9dd78e9ffd261cec)
Signed-off-by: Michael Tokarev <[email protected]>

Author: rth7680

target/arm/tcg/translate-a64.c

@@ -1499,7 +1499,8 @@ bool sme_enabled_check(DisasContext *s)
      * to be zero when fp_excp_el has priority.  This is because we need
      * sme_excp_el by itself for cpregs access checks.
      */
-    if (!s->fp_excp_el || s->sme_excp_el < s->fp_excp_el) {
+    if (s->sme_excp_el
+        && (!s->fp_excp_el || s->sme_excp_el <= s->fp_excp_el)) {
         bool ret = sme_access_check(s);
         s->fp_access_checked = (ret ? 1 : -1);
         return ret;