This is the mail archive of the gcc-help@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: cr5-6 registers on i386

From: Clemens Kolbitsch <clemens dot kol at gmx dot at>
To: Ian Lance Taylor <iant at google dot com>
Cc: gcc-help at gcc dot gnu dot org
Date: Mon, 30 Jul 2007 19:16:42 +0200
Subject: Re: cr5-6 registers on i386
References: <200707301111.06038.clemens.kol@gmx.at> <m36441x1gu.fsf@localhost.localdomain>

> The x86 architecture has control registers. 

well it has obviously at least some :-)

> They are not all 
> implemented in hardware; I believe the only ones which are implemented
> are %cr0 through %cr4 and %cr8 (64-bit only).

this is correct, yes...

> However, as the 
> relevant opcodes are not (yet) used for anything else, the GNU
> assembler and disassembler will recognize other registers.  You will
> presumably get an exception if you try to actually run the program on
> x86 hardware.

ok, didn't think that they were defined but not used - thanks A LOT for your 
help!!

greetings

References:
- cr5-6 registers on i386
  - From: Clemens Kolbitsch
- Re: cr5-6 registers on i386
  - From: Ian Lance Taylor

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]