Re: [Qemu-devel] [4932] Preliminary PPC64/Linux host support

[malc]

On Sat, 26 Jul 2008, Andreas F?rber wrote:

> Am 26.07.2008 um 20:54 schrieb malc:
>
> > > there are currently numbers hardcoded for Linux.
> >
> > It's not just about numbers, last time i looked (cursory) the ABIs where
> > a lot different (PPC32 case) just changing the numbers wont get one very
> > far i think.
>
> Of course not only, but it's one step that could be applied. The stack 
> alignment is 16 Bytes for both, and the prolog in my ppc(32) branch seems to 
> match the referenced Apple pseudocode now.
>
> Where else do you have differences in mind? Which additional functions may 
> need to be adjusted?

I'd have to check Darwins ABI to be sure, but here's the short list:

 a. Alignement of 64 bit arguments (in the register file)
    (This was the thing that confused Sparcs ASI helpers when i first
     tried to boot Sparc on, then new, PPC32 tcg)

 b. List of reserved registers

 c. The approach to TOC (or however Apple calls the substitute)

In any case, PPC32 + MacOS X i can help with. PPC64 + MacOS X not so much.

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