target/riscv: Add asserts for out-of-bound access

Coverity complained about the possible out-of-bounds access with
counter_virt/counter_virt_prev because these two arrays are
accessed with privilege mode. However, these two arrays are accessed
only when virt is enabled. Thus, the privilege mode can't be M mode.

Add the asserts anyways to detect any wrong usage of these arrays
in the future.

Suggested-by: Peter Maydell <[email protected]>
Signed-off-by: Atish Patra <[email protected]>
Fixes: Coverity CID 1558459
Fixes: Coverity CID 1558462
Reviewed-by: Alistair Francis <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Alistair Francis <[email protected]>

Author: atishp04

target/riscv/pmu.c

@@ -204,6 +204,7 @@ static void riscv_pmu_icount_update_priv(CPURISCVState *env,
     }
 
     if (env->virt_enabled) {
+        g_assert(env->priv <= PRV_S);
         counter_arr = env->pmu_fixed_ctrs[1].counter_virt;
         snapshot_prev = env->pmu_fixed_ctrs[1].counter_virt_prev;
     } else {
@@ -212,6 +213,7 @@ static void riscv_pmu_icount_update_priv(CPURISCVState *env,
     }
 
     if (new_virt) {
+        g_assert(newpriv <= PRV_S);
         snapshot_new = env->pmu_fixed_ctrs[1].counter_virt_prev;
     } else {
         snapshot_new = env->pmu_fixed_ctrs[1].counter_prev;
@@ -242,6 +244,7 @@ static void riscv_pmu_cycle_update_priv(CPURISCVState *env,
     }
 
     if (env->virt_enabled) {
+        g_assert(env->priv <= PRV_S);
         counter_arr = env->pmu_fixed_ctrs[0].counter_virt;
         snapshot_prev = env->pmu_fixed_ctrs[0].counter_virt_prev;
     } else {
@@ -250,6 +253,7 @@ static void riscv_pmu_cycle_update_priv(CPURISCVState *env,
     }
 
     if (new_virt) {
+        g_assert(newpriv <= PRV_S);
         snapshot_new = env->pmu_fixed_ctrs[0].counter_virt_prev;
     } else {
         snapshot_new = env->pmu_fixed_ctrs[0].counter_prev;