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From: "amodra at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/15687] New: powerpc64 abi breakage with nocancel functions
Date: Thu, 27 Jun 2013 01:17:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=15687

            Bug ID: 15687
           Summary: powerpc64 abi breakage with nocancel functions
           Product: glibc
           Version: 2.18
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: amodra at gmail dot com
                CC: drepper.fsp at gmail dot com

glibc contains powerpc64 functions without functions descriptors.  As seen in
nptl/ptw-pause.o

[snip]
  [ 1] .text     PROGBITS    0000000000000000 000040 0000b4 00  AX  0   0  4
[snip]
  [ 5] .opd      PROGBITS    0000000000000000 0000f8 000018 00  WA  0   0  8
[snip]
    10: 0000000000000000   180 FUNC    GLOBAL DEFAULT    5 __libc_pause
    11: 000000000000000c    48 FUNC    GLOBAL DEFAULT    1 __pause_nocancel

Notice that __pause_nocancel is define in .text, ie. does not have a function
descriptor.  This triggered an error in powerpc64 gold --gc-sections.

It looks to me like
nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h is the culprit. 
The ENTRY macro normally is reposible for generating function descriptors, but
I see no such thing for the nocancel variant entry point.

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