<div dir="ltr"><div class="gmail_default" style>All,</div><div class="gmail_default" style><br></div><div class="gmail_default" style>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?</div>
<div class="gmail_default" style><br></div><div class="gmail_default" style>Cheers,</div><div class="gmail_default" style><br></div><div class="gmail_default" style>David</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Tue, Jan 15, 2013 at 3:59 PM, David Sehr <span dir="ltr"><<a href="mailto:sehr@google.com" target="_blank">sehr@google.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div class="gmail_default"><div style="font-size:13px;font-family:arial,helvetica,sans-serif"><font color="#000000">Hello,<br></font></div><div style="font-size:13px;font-family:arial,helvetica,sans-serif">
<div><font color="#000000"><br></font></div><div><font color="#000000">Background:</font></div><div><font color="#000000">We (the Portable Native Client team) would like to continue upstreaming</font></div><div><font color="#000000">our LLVM modifications which contain support for Software Fault</font></div>
<div><font color="#000000">Isolation (SFI) as required for sandboxing programs to run under</font></div><div><font color="#000000">Native Client. Since the "total patch size" is quite big, we are</font></div><div>
<font color="#000000">splitting the effort to manageable chunks that can be committed,</font></div><div><font color="#000000">tested and reviewed separately as independently as feasible.</font></div><div><font color="#000000"><br>
</font></div><div><font color="#000000">Eli has recently landed the changes we needed for instruction bundling</font></div><div><font color="#000000">and alignment. Thanks to those of you who provided reviews </font>and</div>
<div>suggestions for improvement.</div><div><font color="#000000"><br></font></div><div><font color="#000000">The next step:</font></div><div><font color="#000000">The second portion that we would like to upstream is in preparation</font></div>
<div><font color="#000000">for our x86-64 Native Client changes. In particular, our ABI is</font></div><div><font color="#000000">dependent on the existence of an ILP32 ABI on x86-64. The</font></div><div><font color="#000000">conventions we rely on are the same as those developed for the</font></div>
<div><font color="#000000">x32 effort, and we propose that the community begin reviewing</font></div><div><font color="#000000">changes to implement the x32 ABI. It should also be noted that the</font></div><div><font color="#000000">x32 ABI is already supported by binutils, gcc, and glibc, and that</font></div>
<div><font color="#000000">the Native Client team hopes to host its changes there on top of</font></div><div><font color="#000000">x32 as well.</font></div><div><font color="#000000"><br></font></div><div><font color="#000000">Our proposal is that the community ratify the idea of supporting</font></div>
</div><div style="font-size:13px;font-family:arial,helvetica,sans-serif"><font color="#000000">the x32 ABI and that the Native Client team start by defining the</font></div><div style="font-size:13px;font-family:arial,helvetica,sans-serif">
<font color="#000000">variables/flags/etc., to allow selecting the x32 ABI in LLVM. We</font></div><div style="font-size:13px;font-family:arial,helvetica,sans-serif"><font color="#000000">are aware of the previous set of patches posted to this list for x32,</font></div>
<div style="font-size:13px;font-family:arial,helvetica,sans-serif"><font color="#000000">and will be as consistent with that direction as possible.</font></div><div style="font-size:13px;font-family:arial,helvetica,sans-serif">
<div><font color="#000000"><br></font></div><div><font color="#000000">For background, the x8-64 Native Client model is described in</font></div><div><a href="http://src.chromium.org/viewvc/native_client/data/site/NaCl_SFI.pdf" target="_blank"><font color="#0b5394">http://src.chromium.org/viewvc/native_client/data/site/NaCl_SFI.pdf</font></a></div>
<div><font color="#000000">x32 is described at <a href="https://sites.google.com/site/x32abi/" target="_blank">https://sites.google.com/site/x32abi/</a></font></div></div><div style="font-size:13px;font-family:arial,helvetica,sans-serif">
<font color="#000000">The previous set of patches was sent attached to</font></div><div style="font-size:13px;font-family:arial,helvetica,sans-serif"><a href="http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120604/144037.html" target="_blank"><font color="#0b5394">http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120604/144037.html</font></a></div>
<div style="font-size:13px;font-family:arial,helvetica,sans-serif"><br></div><div style="font-size:13px;font-family:arial,helvetica,sans-serif">Cheers,</div><div style="font-size:13px;font-family:arial,helvetica,sans-serif">
<br></div><div style="font-size:13px;font-family:arial,helvetica,sans-serif">David</div></div></div>
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