+/*
+ * Check for traps to Debug Comms Channel registers. If FEAT_FGT
+ * is implemented then these are controlled by MDCR_EL2.TDCC for
+ * EL2 and MDCR_EL3.TDCC for EL3. They are also controlled by
+ * the general debug access trap bits MDCR_EL2.TDA and MDCR_EL3.TDA.
+ */
+static CPAccessResult access_tdcc(CPUARMState *env, const ARMCPRegInfo *ri,
+ bool isread)
+{
+ int el = arm_current_el(env);
+ uint64_t mdcr_el2 = arm_mdcr_el2_eff(env);
+ bool mdcr_el2_tda = (mdcr_el2 & MDCR_TDA) || (mdcr_el2 & MDCR_TDE) ||
+ (arm_hcr_el2_eff(env) & HCR_TGE);
+ bool mdcr_el2_tdcc = cpu_isar_feature(aa64_fgt, env_archcpu(env)) &&
+ (mdcr_el2 & MDCR_TDCC);
+ bool mdcr_el3_tdcc = cpu_isar_feature(aa64_fgt, env_archcpu(env)) &&
+ (env->cp15.mdcr_el3 & MDCR_TDCC);
+
+ if (el < 2 && (mdcr_el2_tda || mdcr_el2_tdcc)) {
+ return CP_ACCESS_TRAP_EL2;
+ }
+ if (el < 3 && ((env->cp15.mdcr_el3 & MDCR_TDA) || mdcr_el3_tdcc)) {
+ return CP_ACCESS_TRAP_EL3;
+ }
+ return CP_ACCESS_OK;
+}
+