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From: "dsmith at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/19500] .callee test failures
Date: Fri, 19 Feb 2016 19:44:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D19500

--- Comment #1 from David Smith <dsmith at redhat dot com> ---
This appears to be the result of s390x's odd debuginfo. On x86_64, you'll s=
ee
something like this (from 'eu-readelf --debug-dump libreloc.so'):

=3D=3D=3D=3D
...
 [    2d]    subprogram
             external             (flag_present) Yes
             name                 (string) "bar"
...
 [    79]    subprogram
             external             (flag_present) Yes
             name                 (string) "foo"
...
             GNU_all_call_sites   (flag_present) Yes
...
 [    bb]      GNU_call_site
               low_pc               (addr) +0x00000000000006e2 <foo+0x12>
               abstract_origin      (ref4) [    2d]
...
=3D=3D=3D=3D

This means that foo() has one callee, bar(), which we can see since foo() h=
as 1
GNU_call_site attribute, whose abstract_origin is 2d (which maps to bar()).

On s390x, we see the following (from 'eu-readelf --debug-dump libreloc.so'):

=3D=3D=3D=3D
...
 [    2d]    subprogram
             external             (flag_present) Yes
             name                 (string) "bar"
...
 [    7b]    subprogram
             external             (flag_present) Yes
             name                 (string) "foo"
...
             GNU_all_call_sites   (flag_present) Yes
 [    bd]      GNU_call_site
               low_pc               (addr) +0x000000000000073a <foo+0x22>
...
=3D=3D=3D=3D

On s390x, we've got a GNU_call_site attribute, but it doesn't have an
abstract_origin attribute to tell us which function was called.

I've sent an email to a gcc developer and we'll see if he can shine any lig=
ht
on this.

--=20
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