diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
index b8cb7a3e..d1a6cbc 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -43,6 +43,7 @@ struct cs_etm_decoder {
 	u32 packet_count;
 	u32 head;
 	u32 tail;
+	u32 *exc_num;
 	struct cs_etm_packet packet_buffer[MAX_BUFFER];
 };
 
@@ -368,24 +369,64 @@ static ocsd_datapath_resp_t
 cs_etm_decoder__buffer_trace_off(struct cs_etm_decoder *decoder,
 				 const uint8_t trace_chan_id)
 {
-	return cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
-					     CS_ETM_TRACE_OFF);
+	int ret;
+	struct cs_etm_packet *packet;
+
+	ret = cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
+					    CS_ETM_TRACE_OFF);
+	if (ret != OCSD_RESP_CONT && ret != OCSD_RESP_WAIT)
+		return ret;
+
+	packet = &decoder->packet_buffer[decoder->tail];
+
+	/* Clear execption number for discontinuous trace */
+	decoder->exc_num[packet->cpu] = UINT32_MAX;
+
+	return ret;
 }
 
 static ocsd_datapath_resp_t
 cs_etm_decoder__buffer_trace_on(struct cs_etm_decoder *decoder,
 				const uint8_t trace_chan_id)
 {
-	return cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
-					     CS_ETM_TRACE_ON);
+	int ret;
+	struct cs_etm_packet *packet;
+
+	ret = cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
+					    CS_ETM_TRACE_ON);
+	if (ret != OCSD_RESP_CONT && ret != OCSD_RESP_WAIT)
+		return ret;
+
+	packet = &decoder->packet_buffer[decoder->tail];
+
+	/* Clear execption number for discontinuous trace */
+	decoder->exc_num[packet->cpu] = UINT32_MAX;
+
+	return ret;
 }
 
 static ocsd_datapath_resp_t
 cs_etm_decoder__buffer_exception(struct cs_etm_decoder *decoder,
+				 const ocsd_generic_trace_elem *elem,
 				 const uint8_t trace_chan_id)
 {
-	return cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
-					     CS_ETM_EXCEPTION);
+	int ret;
+	struct cs_etm_packet *packet;
+
+	ret = cs_etm_decoder__buffer_packet(decoder, trace_chan_id,
+					    CS_ETM_EXCEPTION);
+	if (ret != OCSD_RESP_CONT && ret != OCSD_RESP_WAIT)
+		return ret;
+
+	packet = &decoder->packet_buffer[decoder->tail];
+
+	/*
+	 * Exception number is recorded per CPU and later can be used
+	 * for exception return instruction analysis.
+	 */
+	decoder->exc_num[packet->cpu] = elem->exception_number;
+
+	return ret;
 }
 
 static ocsd_datapath_resp_t
@@ -423,7 +464,7 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
 						    trace_chan_id);
 		break;
 	case OCSD_GEN_TRC_ELEM_EXCEPTION:
-		resp = cs_etm_decoder__buffer_exception(decoder,
+		resp = cs_etm_decoder__buffer_exception(decoder, elem,
 							trace_chan_id);
 		break;
 	case OCSD_GEN_TRC_ELEM_EXCEPTION_RET:
@@ -511,6 +552,10 @@ cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params,
 	if (!decoder)
 		return NULL;
 
+	decoder->exc_num = zalloc(sizeof(*decoder->exc_num) * num_cpu);
+	if (!decoder->exc_num)
+		goto err_free_decoder;
+
 	decoder->data = d_params->data;
 	decoder->prev_return = OCSD_RESP_CONT;
 	cs_etm_decoder__clear_buffer(decoder);
@@ -531,7 +576,7 @@ cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params,
 	decoder->dcd_tree = ocsd_create_dcd_tree(format, flags);
 
 	if (decoder->dcd_tree == 0)
-		goto err_free_decoder;
+		goto err_free_decoder_exc_num;
 
 	/* init library print logging support */
 	ret = cs_etm_decoder__init_def_logger_printing(d_params, decoder);
@@ -542,6 +587,9 @@ cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params,
 	cs_etm_decoder__init_raw_frame_logging(d_params, decoder);
 
 	for (i = 0; i < num_cpu; i++) {
+		/* init expcetion number to an invalid value */
+		decoder->exc_num[i] = UINT32_MAX;
+
 		ret = cs_etm_decoder__create_etm_decoder(d_params,
 							 &t_params[i],
 							 decoder);
@@ -553,6 +601,8 @@ cs_etm_decoder__new(int num_cpu, struct cs_etm_decoder_params *d_params,
 
 err_free_decoder_tree:
 	ocsd_destroy_dcd_tree(decoder->dcd_tree);
+err_free_decoder_exc_num:
+	free(decoder->exc_num);
 err_free_decoder:
 	free(decoder);
 	return NULL;
@@ -613,5 +663,6 @@ void cs_etm_decoder__free(struct cs_etm_decoder *decoder)
 
 	ocsd_destroy_dcd_tree(decoder->dcd_tree);
 	decoder->dcd_tree = NULL;
+	free(decoder->exc_num);
 	free(decoder);
 }
