xtensa: complete ptrace handling of register windows
Compute WindowBase and WindowMask registers correctly on ptrace calls. Work done earlier by Maxim, Christian and Marc. Signed-off-by: Marc Gauthier <marc@tensilica.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
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