[Bug binutils/18771] New: objdump incorrectly disassembles 'bndmov', etc., with 32-bit address in 64-bit mode.

[m at rolle dot name]

https://sourceware.org/bugzilla/show_bug.cgi?id=18771

            Bug ID: 18771
           Summary: objdump incorrectly disassembles 'bndmov', etc., with
                    32-bit address in 64-bit mode.
           Product: binutils
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: m at rolle dot name
  Target Milestone: ---

Related to bug 18770 (for gas).  Same confusion as to allowed memory operand
address sizes.

If I assemble  "bndmov [eax], bnd1", gas won't allow this, but I can get the
desired effect with a standalone addr prefix..
    addr32
    bndmov [rax], bndl".

The disassembly will read 
    67 66 0f 1b 08              addr32 bndmov [rax],bnd1

The correct reading should be
    67 66 0f 1b 08              bndmov [eax],bnd1

One aspect of this bug is that if the output code is copied into an assembler
file, that instruction will not assemble.  gas will not allow the addr32 on the
same line as the bndmov.  I'm sure the desired intent is that the output of
objdump should always assemble back to the original binary code.

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