<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi Reid,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We plan to work on assembler directives after this set of patches is upstreamed. We currently emit the unwinding opcodes into object files only.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Sanjin<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b>From:</b> Reid Kleckner <rnk@google.com> <br><b>Sent:</b> Thursday, July 19, 2018 11:10 AM<br><b>To:</b> ssijaric@codeaurora.org<br><b>Cc:</b> llvm-dev <llvm-dev@lists.llvm.org><br><b>Subject:</b> Re: [llvm-dev] Upstreaming Exception Handling support for Windows on ARM64<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>I think your order of patches makes sense.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Do you plan to add assembler directives similar to the .cfi_* and .seh_* directives? The assembly examples in the Microsoft docs don't have any, but I think it would be really valuable for MC to have some. It's really useful to be able to modify compiler generated assembly manually, reassemble with a slightly different prologue, and have everything just work. For example, I'm imagining the assembler would be responsible for adding nop unwind codes for each non-prologue instruction interleaved in the prologue.<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Tue, Jul 17, 2018 at 12:04 PM via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>We would like to upstream exception handling support for Windows on ARM64. Microsoft-published specifications can be found here:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>a) <a href="https://docs.microsoft.com/en-us/cpp/build/arm64-exception-handling" target="_blank">https://docs.microsoft.com/en-us/cpp/build/arm64-exception-handling</a><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>b) <a href="https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions" target="_blank">https://docs.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions</a><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>We propose the following approach:<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>1) Upstream miscellaneous clang and llvm patches that are needed for exception handling on ARM64 Windows. These are small patches that deal with the ABI, relocations, etc. There are around 8 or 9 patches to upstream.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>2) Upstream the MCLayer part. This mostly deals with unwinding opcodes that are described in a). This will probably consist of two patches.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>3) Upstream the AArch64 frame lowering part. This mostly deals with emitting unwinding opcodes, as well as some small changes to the exception handling tables. Probably two patches.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>4) Upstream setjmp support. This consists of two patches (one clang and one llvm).<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Any thoughts?<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Mandeep and I will start upstreaming shortly.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks,<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Sanjin<o:p></o:p></p></div></div><p class=MsoNormal>_______________________________________________<br>LLVM Developers mailing list<br><a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br><a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" target="_blank">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><o:p></o:p></p></blockquote></div></div></body></html>