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Message-ID: <420A9908.1060507@bellard.org>
Date: Thu, 10 Feb 2005 00:13:12 +0100
From: Fabrice Bellard <fabrice@bellard.org>
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Subject: Re: [Qemu-devel] Debugging registers DR0, DR7 don't work
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To: qemu-devel@nongnu.org

Paolo Minazzi wrote:
> I'm Paolo Minazzi and I am a new user of QEMU.
> I use it to learn protected mode programming in asm.
> QEMU is very useful as I can avoid to reset continuosly my PC.
> 
> Nevertheless I have a problem.
> I have tried to write an asm program to try dr0 and dr7 debugging register.
> I have found that this register don' work and I cannot receive the 
> excepction 1.
> My program instead works fine in a real DOS system.
> 
> Does someone indicate me how to enable debugging register with QEMU ?

Debug registers are currently unsupported by QEMU, but there is nothing 
preventing to support them.

With the upcoming QEMU Accelerator Module, they are supported for CPL=3 
(= for user code, which is the most useful).

Fabrice.