How to get value of gs:0xc with LTS note in coredump?

慕冬亮 <[email protected]> Mon, 3 Oct 2016 20:59:45 -0400

Newsgroups	gmane.comp.gdb.devel
Message-ID	<CAD-N9QXD-CntrGWEA8gYAXnURnC+7u3L1m1FwfzOgK0BcdCG9A@mail.gmail.com>

Dear all,

I have a question about gs and TLS in core dump. When I read the
assembly code from one coredump, there is one memory dereference :
gs:[edx] or gs:0xc.

I googled gs register and found it points to Thread Local Storage.
However, gs is a selector to GDT and this structure is in the kernel.
And I could not obtain it in coredump.

Then I searched all the segments in core dump. I found a note entry
with type NT_386_TLS, length 0x30. Is gs:0xc in this note ? And gs:0xc
is the 12th element of this note entry?

--
My best regards to you.

     No System Is Safe!
     Dongliang Mu