target-s390x: PER instruction-fetch nullification event support

For the instruction-fetch nullification event, we just reuse the existing instruction-fetch code and trigger the exception immediately in that case. There is no need to save the CPU state in the TCG code as it has been saved by the previous instruction before calling the per_check_exception helper. Signed-off-by: Aurelien Jarno <[email protected]> Signed-off-by: Alexander Graf <[email protected]>
xlee · Jun 17, 2015 · 83bb161 · 83bb161
1 parent 2f54394
commit 83bb161
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c
@@ -625,6 +625,18 @@ void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
     if ((env->cregs[9] & PER_CR9_EVENT_IFETCH) && get_per_in_range(env, addr)) {
         env->per_address = addr;
         env->per_perc_atmid = PER_CODE_EVENT_IFETCH | get_per_atmid(env);
+
+        /* If the instruction has to be nullified, trigger the
+           exception immediately. */
+        if (env->cregs[9] & PER_CR9_EVENT_NULLIFICATION) {
+            CPUState *cs = CPU(s390_env_get_cpu(env));
+
+            env->int_pgm_code = PGM_PER;
+            env->int_pgm_ilen = get_ilen(cpu_ldub_code(env, addr));
+
+            cs->exception_index = EXCP_PGM;
+            cpu_loop_exit(cs);
+        }
     }
 }
 #endif