User CA           TEEC_InvokeCommand()
                          |
                          |
                          |
User TA                   v
                TEE_InvokeTACommand()
                          |
                          |
                 PTA_CMD_GCOV_CORE_DUMP_ALL
                          |
                          v
PTA gcov      gcov.c:pta_gcov_core_dump_all()
                          |
                          |
                          |
core libgcov              v
           gcov.c:gcov_dump_all_coverage_data()
                          |
                          |
                          v
           gcov_gcc_4_7.c:dump_all_coverage_data()
                          |
                          |
                          v
          core_dump_coverage.c:core_direct_dump_data()
                          |
                          |
                          v
           gcov.c:gcov_dump_coverage_data()
                          |
                          |
                          |
core                      v
           tee_gcov_writer.c:tee_gcov_writer()
                          |
                          |
                   OPTEE_RPC_CMD_GCOV
                          |
tee_supplicant            v
          Handle the RPC to write coverage data in REE FS