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[Bug gold/22883] Gold mis-evaluates R_X86_64_PLT32 reloc


From: hjl.tools at gmail dot com
Subject: [Bug gold/22883] Gold mis-evaluates R_X86_64_PLT32 reloc
Date: Fri, 23 Mar 2018 11:30:20 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=22883

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Cary Coutant from comment #1)
> I don't see how the Gnu linker is making this work. All your PLT32
> relocations are missing the "-4" bias for a pc-relative reference. As far as
> I can see, gold is doing the right thing, and the assembler is emitting bad
> relocations.

The clue is in

 % objdump -dr pscopyca.o
  [...]
   2d1: e8 fc ff ff ff          callq  2d2 <mx_ippsZero_16s+0x14>
^^^^^^^^^^^^^^^^^^^^^^  Herr is -4.
                        2d2: R_X86_64_PLT32     mx_ownsZero_8u
   [...]

Yes, the object file is bad.  It uses RELA, but stores relocations
like REL.  Which assembler generates it?

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