171     uint16_t inst2;  member
174     uint32_t inst2;
376 ….inst2 = make_j_16(&slot->inst2, (void *) irq_handler_chain_first_slot),     // b irq_handler_chai…  in irq_add_shared_handler()
380 ….inst2 = (uint32_t)handler,                                                  // (t0 points to hand…  in irq_add_shared_handler()
403                     .inst2 = 0x4780,                                                   // blx r0  in irq_add_shared_handler()
407 …    .inst2 = make_call_inst2(handler),                                 // jalr ra, %lo(handler)(ra)  in irq_add_shared_handler()
424 ….inst2 = make_j_16(&slot->inst2, (void *) irq_handler_chain_first_slot),   // b irq_handler_chain_…  in irq_add_shared_handler()
428 ….inst2 = (uint32_t)handler,                                                // (t0 points to handle…  in irq_add_shared_handler()
438             existing_vtable_slot->inst2 = 0x4780; // blx r0  in irq_add_shared_handler()
441             void *handler_of_existing_head = (void*)existing_vtable_slot->inst2;  in irq_add_shared_handler()
443             existing_vtable_slot->inst2 = make_call_inst2(handler_of_existing_head);  in irq_add_shared_handler()
459         return (irq_handler_t)slot->inst2;  in handler_from_slot()
463             ((slot->inst1 >> 12) << 12) + (uint32_t)((int32_t)slot->inst2 >> 20)  in handler_from_slot()
522                         to_free_slot->inst2 = (uint32_t)handler_of_next_slot;  in irq_remove_handler()
525                         to_free_slot->inst2 = make_call_inst2(handler_of_next_slot);  in irq_remove_handler()