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From: "jistone at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug dyninst/15136] New: stapdyn doesn't fill registers on 32-bit x86
Date: Mon, 11 Feb 2013 21:11:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=15136

             Bug #: 15136
           Summary: stapdyn doesn't fill registers on 32-bit x86
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dyninst
        AssignedTo: systemtap@sourceware.org
        ReportedBy: jistone@redhat.com
    Classification: Unclassified


On 32-bit x86, Dyninst currently doesn't make any registers available to
instrumentation snippets.  Our code fills what it can (nothing) and writes
zeros for the rest.  Thus, any code in the probe handlers which read registers
will get incorrect data, and probably error out if they try to read and
dereference a pointer.

Our code is dynamic about available registers, so once Dyninst expands its
support, stapdyn should just start working too.  Thus, this bug is just for
tracking purposes, and to remind us to try again later.

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