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32-bit memory models
- From: "Young, Michael" <Michael dot Young at paetec dot com>
- To: <gcc-help at gcc dot gnu dot org>
- Date: Thu, 22 Jun 2006 18:54:03 -0400
- Subject: 32-bit memory models
I'm looking for a definitive answer, and I can't seem to find anything in the docs on this... Does GCC/G++ support segment:offset (48-bit) pointers for protected mode 32-bit programming on 32-bit Intel processors? I'd like to use a "compact" memory model, where code is "near" (in the same segment), but data pointers are "far" (by default, with an option to explicitly override using a "near/far" keyword modifier. This is similar to traditional 16-bit memory models (Intel ABI), except that the offsets are full 32-bits and segments don't necessarily refer to overlapping memory space. The reason I'm looking to do this is that I want to develop an OS feature using security provided via the LDT, and I'd like to avoid having to revert to assembler every time I need to look at memory using a different selector. (If this topic is in the documentation, please point me to the right place!)
Thanks,
Mike