[Bug runtime/17469] New: support kernel unwinding based on .eh_frame rather than .debug_frame data

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17469

            Bug ID: 17469
           Summary: support kernel unwinding based on .eh_frame rather
                    than .debug_frame data
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com

Some kernel images come with .eh_frame vs. .debug_frame unwind data.
(The latter is popular with CFLAGS+=-fno-async-unwind-tables
machines such as x86.)  The stap runtime is reportedly unable to
handle the former (for the kernel; for userspace backtracing it
is reportedly fine).  We should make sure the runtime accepts
both eh* and debug* for both kernel & userspace.

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