Date: Mon, 7 Mar 2016 11:50:53 -0700 From: Warner Losh <imp@bsdimp.com> To: Dimitry Andric <dim@freebsd.org> Cc: src-committers <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org> Subject: Re: svn commit: r296428 - head/sys/boot/common Message-ID: <10F1E4F3-BE8A-4BC3-AFC3-FB4C3A729B60@bsdimp.com> In-Reply-To: <C6FFFB5D-EAE1-4BFA-90EC-6AE2DF67A921@FreeBSD.org> References: <201603061557.u26FvhMi033982@repo.freebsd.org> <56DCD52F.4010709@freebsd.org> <AC0A9708-B618-4D05-8532-BD451AB94A60@FreeBSD.org> <1457365187.13785.174.camel@freebsd.org> <20160307155217.GJ67250@kib.kiev.ua> <CANCZdforb7gAanu4Hys6b2NmhOGVGn7UutsUqav5gGUsqSTMxA@mail.gmail.com> <C6FFFB5D-EAE1-4BFA-90EC-6AE2DF67A921@FreeBSD.org>
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[-- Attachment #1 --] > On Mar 7, 2016, at 10:41 AM, Dimitry Andric <dim@freebsd.org> wrote: > > On 07 Mar 2016, at 17:28, Warner Losh <imp@bsdimp.com> wrote: > ... >> Alternatively, is there a switch to clang 3.8 that says 'Don't generate the new >> relocation, use the old one instead" which would also be safe and allow a >> less-bumpy transition? > > On amd64, we actually compile source files for the kernel with > -fno-asynchronous-unwind-tables, which is the flag that ensures object > files do not end up with a .eh_frame section, because the compiler will > refrain from inserting CFI directives into the assembler. Excellent. > However, this only affects C source files, and we have a number of > hand-written assembler sources in the tree, with CFI directives in them. > These will always result in .eh_frame sections, unless there is another > assembler-specific flag of suppressing that. what are the odds of fixing this? Since the vast majority of assembler code is going to be in the base kernel. The AESNI stuff is the only exception that I can think of… Are the CFI directives so that DTRACE works, or is there some other reason? Warner [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJW3c2NAAoJEGwc0Sh9sBEAUqwP/1SksK5IiSg25Ui0EpcLfOXs C2j33VzFUxTCnPMERgPW+gs5dHHE8MnMWl2LgDGmPeVtTn9R27wjqliOK1z6laOk DkCvveuvQrodaO43ZcBgqWnkyq4feRAMCq0KDVPG+LDFI++7i8Lhfi+WbmGL+q09 l0AnYMLy7nbQD7zqbIg235MyWxf4fuByrw+jWcGje+LrB/P1TgrwtRkOAuGQX7eh ihxYarEd7XF0+H9r5Byk5aXR33XyKIbJQCIAk7Vismom3YkPhHvPSuDGNpkrBf5L T0KhBNdPF/9x5sQUBOIZ4lMxKEnGoUQPgKvAolJxuDZdMUlHfUYQ+QS9uoAQVD8t ySwd8GO/ngqPk0GmzzDwhGiR9hH3ugbhChkxin70jcCf7mZia0ARvFTlgeTbrl1I MLiKJMm5yUTkhGa5CSXWB9/cH1cBTHHNWksjInZ+KXFjgNBTulzWrA+klSaNMjkH gi2Or/hyMrXX0os8zwJI8SAMuQzfPuBHbRnjhHhcKhrpar/QSa9MIR1201/bF7yN 5Nv4dlCTS+6eXsMBH13PnDtF1CESUiMUBZsJX9gNgqQvHqEwqTig3DhyBHR4yytB rJukKlw/1fczz7wxKDKrS416NxdD1iJ0klGpLYlykNxQb3M41menBps7WGYDMTsM p2SBhZEy8AS2ohgC9D5g =kUVS -----END PGP SIGNATURE-----
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