DBCR0_BT
task->thread.debug.dbcr0 &= ~DBCR0_BT;
task->thread.debug.dbcr0 = DBCR0_IDM | DBCR0_BT;
task->thread.debug.dbcr0 &= ~(DBCR0_IC | DBCR0_BT);
mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_BT);
current->thread.debug.dbcr0 &= ~DBCR0_BT;
spr_val &= (DBCR0_IDM | DBCR0_IC | DBCR0_BT | DBCR0_TIE |