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From: "azanella at linux dot vnet.ibm.com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/16430] New: PowerPC: ftime gettimeofday internal call returning bogus data
Date: Fri, 10 Jan 2014 16:48:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=16430

            Bug ID: 16430
           Summary: PowerPC: ftime gettimeofday internal call returning
                    bogus data
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: azanella at linux dot vnet.ibm.com
                CC: drepper.fsp at gmail dot com

The testcase:

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/timeb.h>

int
main ()
{
  struct timeval tv;
  struct timeb s, slast;
  int c = 0;

  ftime (&slast);
  while (c < 10)
    {
      ftime (&s);
      if (s.time < slast.time
          || (s.time == slast.time && s.millitm < slast.millitm))
        exit (1);
      if (s.time != slast.time)
        ++c;
      slast.time = s.time;
      slast.millitm = s.millitm;
    }
  exit (0);
}

Is failing for PPC32 after ef26eece6331a1f6d959818e37c438cc7ce68e53 (PowerPC:
gettimeofday optimization by using IFUNC). This is due the fact linker is not
setting the gettimeofday call from ftime through a PLT, as PPC64; and thus
calling __gettimeofday ifunc resolver directly.

A possible fix would be detect a PPC32 build and set the internal symbol
'__GI___gettimeofday' to a different implementation than the ifunc resolver.

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