[Bug translator/12147] New: Automagically include kernel data when needed through pragma:kernel_data

[mjw at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12147

           Summary: Automagically include kernel data when needed through
                    pragma:kernel_data
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
        AssignedTo: systemtap@sources.redhat.com
        ReportedBy: mjw@redhat.com


There should be a new embedded C pragma:kernel_data or something similar so
that functions like modname(), symname() and symdata() can indicate they need
access to it.

It could work similar to pragma:vma which slurps in the vdso data for example.
See usage of /* pragma:vma */ usage in tapset/ucontext.stp, detection in
elaborate.cc visit_embeddedcode () and usage of that information through
enable_vma_tracker () and emit_symbol_data () in translate.cxx.

This would make scripts that use symbol data translation functions work out of
the box without needing to know whether other probes (through kprobes) slurp in
the kernel data already or not.

Simplest testcase: stap -e 'probe begin { log(symdata(0xffffffff81d90ca0)) }'
(which currently doesn't work unless -d kernel is explicitly given)

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