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Mastering Assembly Programming

You're reading from  Mastering Assembly Programming

Product type Book
Published in Sep 2017
Publisher Packt
ISBN-13 9781787287488
Pages 290 pages
Edition 1st Edition
Languages
Author (1):
Alexey Lyashko Alexey Lyashko
Profile icon Alexey Lyashko

Far pointers

It may be relatively safe to say that far pointers belong to the past when it comes to the application development level; however, it would not be right not to mention them here, as, after all, there are a few useful things we can do with it. Putting it simply, a far pointer combines a segment selector and an offset into the segment. Originating in the era of 16-bit modes of operation, surviving the 32-bit protected mode, far pointers have made it to the long mode, although they are hardly relevant, as, especially in long mode, all memory is considered to be a flat array and we are hardly going to use them.

The instructions used (some are obsolete) for loading a far pointer into the segment register: general-purpose register pairs are as follows:

  • LDS: This loads the selector part of the far pointer into the DS
  • LSS: This loads the selector part of the far pointer...
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