[Bug translator/14737] New: plt.return probes

[Bug translator/14737] New: plt.return probes

[fche at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14737

             Bug #: 14737
           Summary: plt.return probes
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


Current code limits PLT uprobes to entries only, but the structure should allow
uretprobes too.  The latter would be handy in order to draw fully nested
inter-library calls, measure times, etc.

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[Bug translator/14737] plt.return probes

[fahadaliarshad at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14737

fahadaliarshad at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fahadaliarshad at gmail dot com

--- Comment #1 from fahadaliarshad at gmail dot com ---
I am wondering if anybody has made progress on PLT uretprobes? If not, then how
much of an effort would it take to implement it.

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[Bug translator/14737] plt.return probes

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14737

--- Comment #2 from Frank Ch. Eigler <fche at redhat dot com> ---
This capability remains undone.  It would require something like:

- tapsets.cxx register_plt_variants() should register some TOK_RETURN
alternatives
- tapsets.cxx query_one_plt() should look for that TOK_RETURN, and map such
  probes to .statement().return synthetic probes
- elsewhere nearby, we'd have to start supporting .statement(0xaddr).return
  probes and map them to the appropriate uretprobes.  This part could be
tricky.

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[Bug translator/14737] plt.return probes

[scox at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14737

Stan Cox <scox at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |scox at redhat dot com
           Assignee|systemtap at sourceware dot org    |scox at redhat dot com

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