John Campbell wrote:
Data Segment being the same? No, I don't see it happening *that*
well. The BSS segment, no problem, but static data?
Anyone remember the nUxi problem?
Yes, I am referring to "byte sex" or "endianness".
Intel is small endian and pSeries/zSeries is large endian. This
As I recall, the CPU can be either - when running OS/2 it was little-endian.
affects how data is laid down in the static data segment unless
there's an extra layer making memory access non-native. (I once did
internals development/maintenance on Thoroughbred Business BASIC so I
know, when it comes to byte sex, whereof I speak.)
I *think* the "Universal" binaries for Mac OS X between the PowerPC
and x86 architectures have two copies of the code and something
special to re-map data, or, possibly, there's some concepts, like
ANDF, snarfed from OSF/1's model, where the loader does something
funky to the code on the way into RAM... or, possibly, there's some
kind of translation that happens during final loading.
Apart from endian differences, I wonder about word size.
Are we all agreed on floating point these days?
--
Cheers
John
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