BP_CIABR
iabr->enabled &= ~BP_CIABR;
bp->enabled |= BP_CIABR;
(bp->enabled & BP_CIABR) ? "inst": "trap");
if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0)
if (bp->enabled & BP_CIABR)
if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP)