[Bug libc/16291] feature request: provide simpler ways to compute stack and tls boundaries

["earthdok at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16291

--- Comment #41 from Sergey Matveev <earthdok at google dot com> ---
(In reply to Rich Felker from comment #39)
> I realize
> this makes a bit more work for tools like ASAN which would rather have
> asynchronous notification (note: they could still get it by intercepting the
> functions that could change the state then calling the query function during
> the intercept)

Doesn't this basically translate to __dl_tls_getaddr(), as far as allocation of
new DTLS blocks is concerned? It's the only function that we can intercept, and
it's a hot one. If we take this approach, we'll need a fast way to check
whether our record needs updating before performing a full query. Something as
simple as a function which returns the current DTV's generation counter should
work, I think?

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