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From: "cmetcalf at tilera dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/17354] New: tile: signed dynamic relocations aren't handled correctly
Date: Sat, 06 Sep 2014 16:22:00 -0000
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X-Bugzilla-Component: dynamic-link
X-Bugzilla-Version: 2.19
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X-Bugzilla-Who: cmetcalf at tilera dot com
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https://sourceware.org/bugzilla/show_bug.cgi?id=17354

            Bug ID: 17354
           Summary: tile: signed dynamic relocations aren't handled
                    correctly
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: cmetcalf at tilera dot com
            Target: tilegx, tilepro

The tst-pie1 regression test fails on tile.  The issue is that we're not
properly
handling signed relocations.  The HWx_LAST relocations are loaded with
"moveli", 
which sign-extends.  Similarly the HW8 relocations tend to be for "movei"
(sign-extending) and BrOff and JOff_Long are both sign-extending.  A simple way
to demonstrate the failure is to take two simple assembly programs like

.global l1
l1:
j l2

and a corresponding program with "l2: j l1", build them both without -fpic but
as shared objects, and link them against a no-op main().  Trying to run the
resulting program generates a "Relocation too large" failure, even though the
l1 and l2 labels are quite close in memory.

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