Re: [Sdcc-user] Question about genCall

[Maarten B. <sou...@ds...>]

>> Well, you know if you or someone else put it there. This is common for
>> BIOS-like library functions that are already present in the memory.
>
>   Thanks for your explanation. I have no experience on using BIOS-like
> library, but I guess what you mean is some kind of library that
> preloaded into memory at a fixed address?

Yes.

>   When talking about function call, I only know call by function name,
> or call by a function pointer. Treating a memory address as function
> is really new to me. This kind of usage only exists in microchip
> enviroment, or I can reproduce it in my PC? Just curious. ;-)

Actually the memory address is treated as a function pointer. And indeed
this is only meaningful on a microcontroller where there is no MMU or
sophisticated OS. The last time this was possible on a PC was when DOS
ruled the PC (>25 years ago).