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Re: [RFC] [PATCH] 32-bit pointers in x86-64

From: "Jan Beulich" <jbeulich at novell dot com>
To: "Paul Brook" <paul at codesourcery dot com>
Cc: <gcc at gcc dot gnu dot org>,"Luca" <luca dot b633 at gmail dot com>, <binutils at sourceware dot org>
Date: Mon, 26 Nov 2007 10:35:14 +0000
Subject: Re: [RFC] [PATCH] 32-bit pointers in x86-64
References: <1ba5638c0711250829o416e3ccasba572d3c205ea7f4@mail.gmail.com> <200711251825.11329.paul@codesourcery.com>

>You can't use conventional 32-bit x86 code, so there seems little or no 
>benefit in allowing 32 and 64-bit code to be mixed.

Why not? Switching between 32- and 64-bit modes doesn't involve anything
(apart from knowing the proper selector register values) that cannot be done
purely in user mode. Specifically, I once successfully tried executing 64-bit
code in a 32-bit process.

Jan

References:
- [RFC] [PATCH] 32-bit pointers in x86-64
  - From: Luca
- Re: [RFC] [PATCH] 32-bit pointers in x86-64
  - From: Paul Brook

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