* [Qemu-devel] Debugging registers DR0, DR7 don't work
@ 2005-02-09 21:50 Paolo Minazzi
2005-02-09 23:13 ` Fabrice Bellard
0 siblings, 1 reply; 2+ messages in thread
From: Paolo Minazzi @ 2005-02-09 21:50 UTC (permalink / raw)
To: qemu-devel
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 ?
Thanks in advance
Paolo Minazzi
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] Debugging registers DR0, DR7 don't work
2005-02-09 21:50 [Qemu-devel] Debugging registers DR0, DR7 don't work Paolo Minazzi
@ 2005-02-09 23:13 ` Fabrice Bellard
0 siblings, 0 replies; 2+ messages in thread
From: Fabrice Bellard @ 2005-02-09 23:13 UTC (permalink / raw)
To: qemu-devel
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2005-02-09 21:50 [Qemu-devel] Debugging registers DR0, DR7 don't work Paolo Minazzi
2005-02-09 23:13 ` Fabrice Bellard
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