[Bug tapsets/13466] New: Failures with ARM EABI

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

http://sourceware.org/bugzilla/show_bug.cgi?id=13466

             Bug #: 13466
           Summary: Failures with ARM EABI
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


On ARM kernels build with EABI we see the following failures:

Running /root/systemtap/testsuite/systemtap.context/context.exp ...
FAIL: int64 function arguments -- numeric
FAIL: int64 function arguments -- numeric --kelf --ignore-dwarf

This is because these tests pass 'long long' arguments.
It seems this differs between ARM calling conventions, newer calling
conventions mandate: "64-bit function parameters passed in registers are
aligned to an even-numbered register instead of using the next available pair."

This could be fixed by taking this into account in tapset/arm/registers.stp
u/s64_arg. But that would break other arm calling conventions.

(Also this would move some of the arguments out of registers and onto the
stack, which arm/registers.stp arch functions aren't yet prepared to handle.)

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