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[Bug runtime/13266] New: Implement DW_CFA_restore in the dwarf unwinder


http://sourceware.org/bugzilla/show_bug.cgi?id=13266

             Bug #: 13266
           Summary: Implement DW_CFA_restore in the dwarf unwinder
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


The recent cleanup of the dwarf unwinder:

commit 3141c9874bc41a0ef16fc0067827be47c475a171
Author: Mark Wielaard <mjw@redhat.com>
Date:   Wed Oct 5 15:04:17 2011 +0200

    Support same value rules in unwinder. Don't treat undefined as same value.

    The unwinder treated undefined and same value rules the same. This patch
    introduces different states for them. All "real" registers are assumed to
    be "same value". Their value will be carried over to the next frame unless
    overruled. All other "fake" dwarf registers are treated as undefined.
    This makes a difference for architectures where for example the dwarf
    return register is a real register, where same value means something
    different from undefined (e.g. ppc).

Broke the setjmp.exp test on i686. This is because "Unknown" now really means
"Unknown" and not "hope for the best". Since DW_CFA_restore isn't implemented
it just sets the register to Unknown, which makes it unusable.

Should be fixed by implementing DW_CFA_restore (and friends) support in the
unwinder.

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