As part of a project to allow development of SNES Homebrew using higher level languages, I have developed a psABI (Processor Specific ABI) for the w65 (WDC 65C816) architecture. The ELF sections of the ABI are implemented in a fork of binutils, https://github.com/SNES-Dev/binutils-gdb, which contains an assembler and linker that (for the most part) work today. The remaining sections are planned to be implemented in a fork of gcc, https://github.com/SNES-Dev/gcc, and associated libraries.

The current location of the ABI Working document is https://github.com/SNES-Dev/SNES-Dev/bl ... /abi/v1.md

I would like any feedback from any interested parties.

welcome! Always interesting to see compiler and related developments.

The 'w65' term is new to me - I suggest it would be worthwhile to add (65816) to your subject line, so this thread is more easily found by those with an interest.

Yeah, perhaps. w65 is the name of the architecture within config.sub so I've been using that as the name in various places.

The location for the document has changed. It now resides in it's own repo, https://github.com/SNES-Dev/abi/v1.md. The Document can also be viewed at https://snes-dev.github.io/abi/v1

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x86?  We ain't got no x86.  We don't NEED no stinking x86!

I'm wondering just how many active hobby '816 systems there are out there.... I know of just 2 - mine and yours... I'm not interested in this ABI, so ...

Not counting the Foenix '816 system which has it's own ecosystem to work with (and the Neon816 is dead-end now), there are very few other active '816 systems that I know of (please, everyone fill in the gaps in my knowledge - start a new thread?) However none I've seen are actually doing anything more than a simple Hello world application... There are many SNES systems out there so for this it does make sense to target that platform specifically.

-Gordon

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Gordon Henderson.
See my Ruby 6502 and 65816 SBC projects here: https://projects.drogon.net/ruby/

Yes, good idea to have a new thread for a survey of 816 builds.

For this thread, InfernoDeity was quite clear at the start about scope: anyone has the right to define the scope of their project. We've seen two opinions about the relative wisdom of that choice - anyone in future can pick one or the other path. As indeed they would do anyway. As it happens, I agree that the SNES is surely a popular platform with an active homebrew scene.

In any case, we can learn from this ABI project even if we don't find it fully applicable for our own purposes.

So, for the record, the abi is defined under the SNES-Dev project as that is where it originated, and that is the primary project I work on it under.
While it was originally intended to be specific to the SNES, and even more specifically SNES-Dev, the psABI is now intended to be a general ABI for the 65c816/w65, and SNES-specific requirements will be relegated to an appropriate machine supplicant. I'm not going to invalidate any argument here, nor am I going to demand that others adopt this, I just want to indicate on record that the scope of the proposed abi is more general than just the SNES.

Also, if there are any components that remain SNES-specific I would consider that a defect in the specification, and would love to hear about it either here or on the issue tracker for the repo. It's possible I did miss something when cleaning up the rest of it.