[Bug libc/6816] Support for POWER7 VSX registers in *context routines

["drepper at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From drepper at redhat dot com  2008-08-25 22:53 -------
The structure size changes.  This cannot be handled using symbol versioning
alone.  We have to resort to the same technique used by stat.  I.e.:

- assign a non-default version to [gs]etcontext so that you cannot link against
  it anymore (see atexit for how to do this)

- create new __x[sg]etcontent interfaces which take the usual interfaces plus a
  version number

- add new [sg]etcontext interfaces into libc_nonshared.a which call the
  __x[sg]etcontent interfaces with the appropriate version argument

This still isn't solving the problem completely.  Is there some padding space in
the old structure?  If yes, use it for a version number.  If there is no room,
add such a field to the new structure somewhere.

The code then must be changed to check for this value so that references are not
passed incorrectly.

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           What    |Removed                     |Added
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             Status|NEW                         |WAITING


http://sourceware.org/bugzilla/show_bug.cgi?id=6816

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