From kde-bugs-dist  Tue Oct 31 18:38:04 2017
From: Carl Love <bugzilla_noreply () kde ! org>
Date: Tue, 31 Oct 2017 18:38:04 +0000
To: kde-bugs-dist
Subject: [valgrind] [Bug 386397] New: valgrind truncates powerpc timebase to 32-bits
Message-Id: <bug-386397-17878 () http ! bugs ! kde ! org/>
X-MARC-Message: https://marc.info/?l=kde-bugs-dist&m=150947509925467

https://bugs.kde.org/show_bug.cgi?id=3D386397

            Bug ID: 386397
           Summary: valgrind truncates powerpc timebase to 32-bits
           Product: valgrind
           Version: 3.14 SVN
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: vex
          Assignee: jseward@acm.org
          Reporter: cel@us.ibm.com
  Target Milestone: ---

---Problem Description---
Valgrind is incorrectly modeling the PowerPC timebase register as 32-bit.=20
Should be 64-bit.=20=20

---uname output---
Linux c650f07p23 4.11.0-42.el7a.ppc64le #1 SMP Mon Oct 9 12:00:22 EDT 2017
ppc64le ppc64le ppc64le GNU/Linux

Machine Type =3D 8335-GTC=20

---Debugger---
A debugger is not configured

---Steps to Reproduce---
 Compile the following example using "gcc -o tb tb.c" and execute.  Without
Valgrind, program will display timebase as 64-bit values.  With Valgrind,
timebase will be limited to 32-bit values and the 2nd timebase printf may
appear to be lesser than the first timebase printf.

#include <stdio.h>
#include <sys/platform/ppc.h>

int main(int argc, char** argv)
{
    uint64_t tb =3D __ppc_get_timebase();
    printf("timebase =3D %lx\n", tb);
    sleep(15);
    tb =3D __ppc_get_timebase();
    printf("timebase =3D %lx\n", tb);

    return 0;
}


Contact Information =3D Tom Gooding / tgooding@us.ibm.com=20

Userspace tool common name: valgrind=20

The userspace tool has the following bit modes: 64-bit=20

Userspace rpm: valgrind-3.12.0-9.el7_4.ppc64le=20

Userspace tool obtained from project website:  na=20

*Additional Instructions for Tom Gooding / tgooding@us.ibm.com:
-Attach ltrace and strace of userspace application.

[reply] [-]
Internal Only
Comment 1 Thomas M. Gooding 2017-10-30 22:48:33 CDT

output:

bash-4.2$ ./tb
timebase =3D 3be626e90262
timebase =3D 3be7f0ad4167




bash-4.2$ valgrind ./tb
=3D=3D89099=3D=3D Memcheck, a memory error detector
=3D=3D89099=3D=3D Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward =
et al.
=3D=3D89099=3D=3D Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyr=
ight info
=3D=3D89099=3D=3D Command: ./tb
=3D=3D89099=3D=3D=20
timebase =3D 8ab00ec0
timebase =3D 552cacc9
=3D=3D89099=3D=3D=20
=3D=3D89099=3D=3D HEAP SUMMARY:
=3D=3D89099=3D=3D     in use at exit: 0 bytes in 0 blocks
=3D=3D89099=3D=3D   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
=3D=3D89099=3D=3D=20
=3D=3D89099=3D=3D All heap blocks were freed -- no leaks are possible
=3D=3D89099=3D=3D=20
=3D=3D89099=3D=3D For counts of detected and suppressed errors, rerun with:=
 -v
=3D=3D89099=3D=3D ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 fr=
om 0)


Issue reported by  Thomas M. Gooding

--=20
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