Re: Base GDB tracing 32bit applications on amd64 kernel (with 64bit debugger) part 1)

[christos%astron.com@localhost (Christos Zoulas)]

In article <20190717090004.GB10622%mail.duskware.de@localhost>,
Martin Husemann  <martin%duskware.de@localhost> wrote:
>On Sat, Jun 29, 2019 at 08:57:10AM +0200, Maxime Villard wrote:
>> In order to reintroduce debugging:
>> 
>>  - The code to handle 32bit LWPs from 64bit LWPs should be in separate
>>    functions.
>
>This sounds reasonable.
>
>>  - The checks on 32bit LWPs should allow non-default segregs -- or we can
>>    say it doesn't matter, and it'll mean for now we won't be able to debug
>>    Wine32.
>
>This would be x86 specific - can you suggest a proper way to check them?
>
>>  - Xen is causing some problems here (as usual...). See process_write_regs(),
>>    we are resetting the ss/cs registers to the default values. Yet in
>>    cpu_setmcontext32 we suddenly don't care about resetting ss/cs to the
>>    default values. It's not clear to me which side is incorrect.
>
>Cc'ing Manuel - can you check this, please?
>
>Kamil/Michal - would one of you have a chance to work on this soonish?
>I would love to see this regression fixed for the -9 branch.

I posted a patch in tech-kern.

christos