Re: [Sdcc-user] How to keep old STM8 calling ABI

[Sebastian 'b. R. <sd...@ba...>]

On 22.02.22 19:20, Richard Hodges wrote:
> Hi, all.
> 
> I see that 4.2 is on its way, and I would like to be sure that my inline
> assembly won't die suddenly.
> 
> The latest manual has a new, expanded section 4.5.1 describing the new
> ABI and states:
> 
> "Using the option –sdcccall 0, the default can be changed to version 0."
> 
> I would like to verify that adding "-sddcall 0" to my compiler flags in
> the Makefile will ensure compatibility with my old assembler code.

To my knowledge `--sdcccall 0` even counts for the standard library and 
therefore is useful if you use your own standard library. 4.2.0 will not 
come with a standard library precompiled for the old calling convention, 
so if you want to use sdcc's it's better to use `__sdcccall(0)` for your 
legacy asm.


> Next question is about new inline assembly code. If I use "-sdcccall 0"
> as a general compiler flag, can I start using "__sdcccall(1)" to use the
> new ABI?
> 
> Would I need this for every function? Or is it persistent for all
> functions until I change it with "__sdcccall(0)"?

The manual actually doesn't say it in the STM8 section, but others are 
more clearly, for example Z80 says:

 > This calling convention can be chosen for individual function via 
__sdcccall(1).

http://sdcc.sourceforge.net/doc/sdccman.pdf#subsection.4.3.3

So you have to add that to every function.

-- 
Freundliche Grüße / Yours sincerely
Sebastian „Baŝto“ Riedel