[lldb-dev] LLDB and QEMU

Todd Fiala tfiala at google.com
Fri Feb 14 08:42:10 PST 2014

Hey Abid,

Steve Pucci, working on getting lldb working with a stock Android
gdbserver, has run into at last one of those issues above (I think issue
4).  He'll probably have some comments on at least a part of it.

On Fri, Feb 14, 2014 at 2:38 AM, Abid, Hafiz <Hafiz_Abid at mentor.com> wrote:

> Hi All,
> I was trying to make the LLDB talk to QEMU. I have identified a few
> problems as described below. I will be sending patches in the coming days.
> Just wanted to inform the community in case someone else is also working in
> this area.
> 1. The thread ids sent by the qemu start with 0. In LLDB, we treat 0 as
> invalid thread id. Probably we need to change the definition of
> 2. The stop reply packet from qemu is 'S05'. Code in
> ProcessGDBRemote::SetThreadStopInfo ()  does not handle this case properly.
> It assumes that there will be n:r pair with thread info.
> https://sourceware.org/gdb/onlinedocs/gdb/Stop-Reply-Packets.html
> 3. We obviously need to provide a target description file with correct
> register information for qemu.
> 4. The Posix dynamic loader is trying to use auxv vector on host for
> calculating the entry address for remote target (AuxVector::GetAuxvData).
> This can only works when the inferior and debugger are on the same system.
> Due to this reason, we end up calculating wrong load address for remote
> case. We may like to add support for 'qXfer:auxv:read' but should also deal
> better when this information is not supplied by the remote target.
> Thoughts/comments are most welcome.
> Thanks,
> Abid
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Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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