[Vm-dev] VM packaging for Cog transition

[David T. Lewis]

On Tue, Nov 09, 2010 at 10:50:31PM +0530, K. K. Subramaniam wrote:
> On Tuesday 09 Nov 2010 7:00:51 am David T. Lewis wrote:
> > Someone recently submitted a magic file with good names (Subbu? I can't
> > find the link).
> you mean
>    http://lists.squeakfoundation.org/pipermail/vm-dev/2010-October/005619.html
> 
> The archive doesn't seem to contain the attachment, so I am attaching it 
> again.
> 
> Subbu

> 0	leshort		6502		Squeak Image Classic
> 0	leshort		6504		Squeak Image Standard
> 0	leshort		6505		Squeak Image with Closure and Float reordering

Ah yes, that's it, thanks!

The image that you run on an Intel box might have been saved on an
older Mac with reversed byte ordering, and we may as well throw in
the theoretically possible 64-bit variations for completeness, so
the magic file entries could be extended like this:

0       lelong          6502            Squeak Image Classic
0       lelong          6504            Squeak Image Standard
0       lelong          6505            Squeak Image with Closure and Float reordering
0       belong          6502            Squeak Image Classic
0       belong          6504            Squeak Image Standard
0       belong          6505            Squeak Image with Closure and Float reordering
0       lelong          68000           Squeak Image 64-bit Classic
0       lelong          68002           Squeak Image 64-bit Standard
0       lelong          68003           Squeak Image 64-bit with Closure and Float reordering
4       belong          68000           Squeak Image 64-bit Classic
4       belong          68002           Squeak Image 64-bit Standard
4       belong          68003           Squeak Image 64-bit with Closure and Float reordering

This works with the original 64-bit image (saved on a Mac) as
well as a newer 64-bit image saved on Intel, so I think the rules
should be right.

Note, the format number is saved in the first 8 bytes (not 4) for
a 64-bit image. A recent Linux supports "lequad" and "bequad", but
this is not portable, hence the "belong" with 4-byte offsets in the
last three lines.

Dave