[uae] Re: 'New' bsdsocket emulation (was Re: A bit of static/extern problems with GNU GCC 4.0.0)
- From: Richard Drummond <evilrich@xxxxxxxxxxxxxx>
- To: uae@xxxxxxxxxxxxx
- Date: Mon, 13 Jun 2005 12:24:47 -0500
Hi
On Monday 13 June 2005 05:09 am, anarkhos@xxxxxxxxxxx wrote:
> I've spared myself knowledge of such differences for the most part. The
> whole situation is ridiculous IMO. Apple took a short-cut to avoid changing
> their build tools and we're still paying for it. It doesn't even use the
> proper PPC SYSV ABI.
I always wondered why they hung on to the Mach-O binary format. About the only
advantage it is has over ELF is support for fat binaries. Of course, now its
obvious why they wanted fat binaries. ;-)
> It certainly hasn't made it easy for the guys trying to port QEMU's ABI
> emulation layer.
Hmm. Yes. Rather them than me. ;-)
> Like what? :)
Well, the problem is how to call AmigaOS functions from the emulator. The
solution at the moment is the 'stack-magic' code, which creates a new stack
frame and thus makes it possible to swap to a new stack context to execute an
AmigaOS call and then swap the stack back to resume the emulator code. It's
kinds of like setjmp/longjmp with knobs on. ;-)
A more portable method to do this, at least SYSV-compatible operating systems,
might be to use makecontext/swapcontext.
A better idea all together would be make the CPU emulation re-entrant, so all
this nonsense shouldn't be necessary. There's still some way to go to achieve
this yet.
> BTW: You have less than a year to add PowerUp support ;)
Hehe. It's on my list of things to do.
> I'm sorry if I haven't been working on e-uae OS X, but I've been busy
> working on Darwine since Apple's announcement. Learning some nitty-gritty
> about OS X's event handling and graphics. Not too dissimilar to what e-uae
> needs to squeeze out some better performance and compatibility.
That's an interesting project. Good luck with it.
> Anyway, thanks a lot Richard. I'll find some time to test your changes
> later this week.
You're welcome.
Cheers,
Rich
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