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From: Doug Rabson <dfr@nlsystems.com>
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On Friday 06 August 2004 00:27, David Xu wrote:
> I am thinking about debugger tls support, giving a link_map address,
> how do I find a modules's tlsindex in FreeBSD ?
> Linux put a l_tls_modid to link_map.

That might be the simplest way. If you add the new field at the end of 
struct link_map, then there shouldn't be any ABI issues since rtld is 
the only thing that allocates these structures.