Re: [Qemu-devel] Re: [PATCH 4/4] gdbstub: x86: Switch 64/32 bit registers dynamically

[Jan Kiszka <jan.kiszka@siemens.com>]

Gerd Hoffmann wrote:
> On 06/29/09 16:43, Paul Brook wrote:
>>>> You've just deliberately broken the qemu gdbstub. After your patch
>>>> it is
>>>> impossible to debug mixed 32/64-bit code.
>>> Please give it a try as it's the other way around: You can't properly
>>> debug mixed target code without my patch.
>>
>> Sure you can, you just need a gdb that doesn't suck.  As soon as you
>> encounter
>> actual mixed code (rather than just running the wrong qemu) your patch
>> causes
>> things to die horribly.
> 
> i.e. the latest gdb release (6.8) works better *with* the workaround,
> and the latest gdb bits from cvs work better *without* the workaround.
> Is that correct?

Nope, even today's gdb requires my patch to work properly in these mixed
scenarios.

> 
> How about making it runtime-switchable then, so qemu can deal with both
> cases?

I hope we will once be able to automatically detected improved gdb
versions. For now I see no need for a command line or whatever switch.
But I'm always open to learn about steps that work without it and fail
when it's applied. I'm not aware of any.

Jan

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