TLS in ARM-nptl - a question

[Uma shankar]

On Tue, Sep 14, 2010 at 3:25 PM, Richard Earnshaw <rearnsha@arm.com> wrote:
>
>
> The code is jumping to a 'well-known' address exported by the linux
> kernel.  That address contains a processor-specific sequence of
> instructions that will return the TLS base for the current address.
>
> Of course, if you're not running on top of the Linux kernel, then you'll
> need to find another way of making all that work.  If your CPU is based
> on ARMv7-A then the compiler will (should) use a CP-15 register directly
> as it's more efficient (but that register did not exist on earlier
> cores).
>
> R.
>

Yes.   I  figured  this out  after  some  google-search......   I saw
the post by Nicolas Pitre and also looked  at entry-armv.S
I intend to read the more about  TLS handling by  ld.so
( This is running on Linux on  arm v7 )

As for the corruption itself,  I think  the user-helper functions
kept at  the page at 0xFFFF0000 have been overwritten . ( Only
privileged-mode  can write here , I believe. ).   If this is the case,
 maybe  this page-data should also be collected in  coredump.  But to
confirm this, I  am waiting for the problem to  reproduce. I may have
to wait  for a week , if at all it happens again.