[PATCH v3 0/11] [x86] Fix 16-bit addressing modes (PR18220) and implement .code16 (PR8684)

[David Woodhouse]

Version 3:

- Be less taciturn in comments.

- Fix some indentation errors.

- Add test cases incrementally as things start to work.

- Drop the renaming of In32BitMode -> Not64BitMode since that was merged
  already in r197768... which also means we can:

- Subsume the addition of In32BitMode, In16BitMode and Not16BitMode into
  the patch which adds .code16 support, rather than having it separate.

- Drop rdar:// and PR comments from x86-16.s since they're pointless and
  Eric is apparently going to drop them from the x86-32 version too.

- Fix EH_RETURN/EH_RETURN64 handling to use is64BitMode() to choose
  between RETQ and RETL, like everything else in that patch did. There
  *may* be a potential micro-optimisation there, but it's probably not
  worth it. Eric made a cryptic comment about this patch which I also
  preserved for posterity, but I have no idea what it meant.

I think I've captured all the review feedback? 

=========================
Version 2:

Dropped the reloc_signed_2byte patch since I don't think it was
necessary. Now it just uses FK_Data_2. We don't have a corresponding
signed relocation type anyway (in ELF at least).

Fixed more instructions to work correctly in 16-bit mode and added test
cases for it all (including some in .code32 for the 16-bit addressing
modes)

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse at intel.com                              Intel Corporation
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