[Bug runtime/13447] New: fallback kernel stacktrace (dump_trace) not available on arm, ppc or s390

["mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13447

             Bug #: 13447
           Summary: fallback kernel stacktrace (dump_trace) not available
                    on arm, ppc or s390
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


For some probe points (begin, end, tracepoints) the dwarf unwinder cannot be
used since there is no register context available. In these cases kernel
backtraces are provided through the kernel dump_trace() facility. Whether this
is available is tested through runtime/autoconf-save-stack-trace.c which will
set
STAPCONF_KERNEL_STACKTRACE.

Currently this fallback unwinder is only available on i686/x86_64, but not on
arm, ppc or s390. See testsuite/systemtap.base/backtrace.exp.

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