From:	Andy Cooper <englbert AT email DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: How to change Executable format to my own?
Date:	Mon, 12 Jul 1999 08:57:03 GMT
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In article <7m5rhs$see$2 AT news DOT luth DOT se>,
  ams AT ludd DOT luth DOT se (Martin Str|mberg)
wrote:

> But it's run in protected mode so the segments are selectors. Now
>
different selectors can point to diffent places, but if you point them
> both
at base=0, and expect code at address 0 not interfere with data
> at address
0, I think you're misstaken. But I'm not an assembly guy,
> so I could be
wrong. Please correct me if so.
> 
> Skunk Anansie, Paranoid & Sunburnt,
>   
							 MartinS
> 

When a
program is in protected mode, it is possible to set the program up so that
there are two _entirely_ seperate segments in two different places in memory.
The segment registers would be used to select the segment for the code (CS
register) and data (DS &  ES registers). The segments, even though they are
not at address 0 in physical memory, the pointers in the segmens refer to the
data from address 0.

Hopefully, this helps to clarify things.

Yours

Andy


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