target/xtensa: fix simcall for newer hardware

After Xtensa release RE.2 simcall opcode has become nop for the
hardware instead of illegal instruction.

Signed-off-by: Max Filippov <[email protected]>

Author: jcmvbkbc

target/xtensa/translate.c

@@ -2367,9 +2367,10 @@ static bool test_ill_simcall(DisasContext *dc, const OpcodeArg arg[],
 #ifdef CONFIG_USER_ONLY
     bool ill = true;
 #else
-    bool ill = !semihosting_enabled();
+    /* Between RE.2 and RE.3 simcall opcode's become nop for the hardware. */
+    bool ill = dc->config->hw_version <= 250002 && !semihosting_enabled();
 #endif
-    if (ill) {
+    if (ill || !semihosting_enabled()) {
         qemu_log_mask(LOG_GUEST_ERROR, "SIMCALL but semihosting is disabled\n");
     }
     return ill;
@@ -2379,7 +2380,9 @@ static void translate_simcall(DisasContext *dc, const OpcodeArg arg[],
                               const uint32_t par[])
 {
 #ifndef CONFIG_USER_ONLY
-    gen_helper_simcall(cpu_env);
+    if (semihosting_enabled()) {
+        gen_helper_simcall(cpu_env);
+    }
 #endif
 }