[LLVMdev] Upstreaming x32 ABI support

Chandler Carruth chandlerc at google.com
Thu Jan 17 13:19:49 PST 2013

I think we're waiting for patches. =]

The smaller and more incremental, the better it'll go...

On Thu, Jan 17, 2013 at 11:32 AM, David Sehr <sehr at google.com> wrote:

> All,
> We have our first CL ready and waiting, but haven't heard from the
> community.  Are there issues or suggestions we should understand a priori?
> Cheers,
> David
> On Tue, Jan 15, 2013 at 3:59 PM, David Sehr <sehr at google.com> wrote:
>> Hello,
>> Background:
>> We (the Portable Native Client team) would like to continue upstreaming
>> our LLVM modifications which contain support for Software Fault
>> Isolation (SFI) as required for sandboxing programs to run under
>> Native Client. Since the "total patch size" is quite big, we are
>> splitting the effort to manageable chunks that can be committed,
>> tested and reviewed separately as independently as feasible.
>> Eli has recently landed the changes we needed for instruction bundling
>> and alignment.  Thanks to those of you who provided reviews and
>> suggestions for improvement.
>> The next step:
>> The second portion that we would like to upstream is in preparation
>> for our x86-64 Native Client changes.  In particular, our ABI is
>> dependent on the existence of an ILP32 ABI on x86-64. The
>> conventions we rely on are the same as those developed for the
>> x32 effort, and we propose that the community begin reviewing
>> changes to implement the x32 ABI.  It should also be noted that the
>> x32 ABI is already supported by binutils, gcc, and glibc, and that
>> the Native Client team hopes to host its changes there on top of
>> x32 as well.
>> Our proposal is that the community ratify the idea of supporting
>> the x32 ABI and that the Native Client team start by defining the
>> variables/flags/etc., to allow selecting the x32 ABI in LLVM.  We
>> are aware of the previous set of patches posted to this list for x32,
>> and will be as consistent with that direction as possible.
>> For background, the x8-64 Native Client model is described in
>> http://src.chromium.org/viewvc/native_client/data/site/NaCl_SFI.pdf
>> x32 is described at https://sites.google.com/site/x32abi/
>> The previous set of patches was sent attached to
>> http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120604/144037.html
>> Cheers,
>> David
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