[Vm-dev] 64bit FFI?

[Andreas Raab]

Eliot Miranda wrote:
> Um, I have (studied my Agrippa), and I quote:
> 
> Does my 64-bit VM run both 32-bit and 64-bit images?
>     No. Any VM will run either 32-bit or 64-bit images, but not both.

This is a bit misleading. What it means is that once you've decided 
whether a 64 bit VM will be used with 32 or 64 bit images, you cannot 
change it. However, 64 bit VMs can absolutely be used to run 32 bit 
images (and why wouldn't they).

Cheers,
   - Andreas


>     You can select one or the other when you generate sources with
>     VMMaker, and you can install both flavors of VM on your system (one
>     each for 32-bit images and 64-bit images).
> 
>     If you try to run a 64-bit image with a VM built for 32-bit images,
>     you will get an error message such as this:
> 
>         This interpreter (vers. 6502) cannot read image file (vers. 68000).
> 
>     If you try to run a 32-bit image using a VM built for 64-bit images,
>     you will get an error message such as this:
> 
>         This interpreter (vers. 68000) cannot read image file (vers. 6502).
> 
> 
> So no, one cannot run a 32-bit image in a 64-bit VM (as I had thought) 
> and the FAQ is quite specific about it.  One has to convert a 32-bit 
> image to a 64-bit image to run it on the 64-bit machine (as detailed ijn 
> the FAQ) and that is not what Andreas is interested in doing.
> 
> Apologies for being so persistent :)
>  
> 
> 
> 
>         http://squeakvm.org/squeak64/faq.html
> 
> 
> 
>     - Bert -
> 
>