[LLVMdev] Upstreaming x32 ABI support

David Sehr sehr at google.com
Thu Jan 17 11:32:28 PST 2013


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?



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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