[Bug bpf/23860] New: unknown opcode 0x8f in string manipulation code

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

https://sourceware.org/bugzilla/show_bug.cgi?id=23860

            Bug ID: 23860
           Summary: unknown opcode 0x8f in string manipulation code
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

% stap -p4 --bpf -e 'global e probe kernel.function("vfs_read") { e[execname()]
= 0 }'

% eu-objdump -d stap_FOOBAR.bo

[...]
      d0:    57 00 00 00 ff 00 00 00  r0 &= 255
      d8:    bf 01 00 00 00 00 00 00  r1 = r0
      e0:    8f 01 00 00 00 00 00 00  invalid class alu64
      e8:    4f 01 00 00 00 00 00 00  r1 |= r0
      f0:    bf 13 00 00 00 00 00 00  r3 = r1
      f8:    bf 20 00 00 00 00 00 00  r0 = r2
     100:    77 00 00 00 08 00 00 00  r0 >>= 8
     108:    57 00 00 00 ff 00 00 00  r0 &= 255
     110:    bf 01 00 00 00 00 00 00  r1 = r0
     118:    8f 01 00 00 00 00 00 00  invalid class alu64
     120:    4f 01 00 00 00 00 00 00  r1 |= r0
     128:    5f 13 00 00 00 00 00 00  r3 &= r1
     130:    bf 20 00 00 00 00 00 00  r0 = r2

% stapbpf stap_FOOBAR.bo
(fails with unknown opcode 0x8f)

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