EXC_BPT
bcopy(&restorebridge, (void *)EXC_BPT, trap_offset);
bcopy(&dblow, (void *)(EXC_BPT + trap_offset), (size_t)&dbend -
case EXC_BPT: trapstr = "BPT"; break;
{ EXC_BPT, "instruction breakpoint" },
|| frame->exc == EXC_BPT