[Bug dynamic-link/17354] tile: signed dynamic relocations aren't handled correctly

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17354

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8622092d584962801e4248cd4bb4bef6e71827b0

commit 8622092d584962801e4248cd4bb4bef6e71827b0
Author: Chris Metcalf <cmetcalf@tilera.com>
Date:   Fri Sep 5 14:40:23 2014 -0400

    [BZ #17354] tile: Fix up corner cases with signed relocations

    Some types of relocations technically need to be signed rather than
    unsigned: in particular ones that are used with moveli or movei,
    or for jump and branch.  This is almost never a problem.  Jump and
    branch opcodes are pretty much uniformly resolved by the static linker
    (unless you omit -fpic for a shared library, which is not recommended).
    The moveli and movei opcodes that need to be sign-extended generally
    are for positive displacements, like the construction of the address of
    main() from _start().  However, tst-pie1 ends up with main below _start
    (in a different module) and the test failed due to signedness issues in
    relocation handling.

    This commit treats the value as signed when shifting (to preserve the
    high bit) and also sign-extends the value generated from the updated
    bundle when comparing with the desired bundle, which we do to make sure
    no overflow occurred.  As a result, the tst-pie1 test now passes.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                 |    6 ++++++
 NEWS                      |    2 +-
 sysdeps/tile/dl-machine.h |   41 +++++++++++++++++++++++------------------
 3 files changed, 30 insertions(+), 19 deletions(-)

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