Use B and C instead of 0xF000 and 0xF001 to pass arguments to the interrupt handler

[Yamakaky]

B and C should be sufficient, you can always pass a struct if you want. For the return value, A is poped, so we can't use it.

[L3nn0x]

We can use B and C for return arguments too

[azertyfun]

Fixed by 0f105c54eb3881928d85f34ea231de881268b255