from etm.c:135
#define DATA_COMPARATOR(i) \
{ ETM_DATA_COMPARATOR_VALUE + 2*(i) - 1, 32, WO, 0x10, \
"ETM_data_" #i "_comparator_value", }, \
{ ETM_DATA_COMPARATOR_MASK + 2*(i) - 1, 32, WO, 0x10, \
"ETM_data_" #i "_comparator_mask", }