From owner-svn-src-head@freebsd.org Tue Feb 6 15:41:16 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 0DB92EE1D85; Tue, 6 Feb 2018 15:41:16 +0000 (UTC) (envelope-from arichardson@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A69566F86D; Tue, 6 Feb 2018 15:41:15 +0000 (UTC) (envelope-from arichardson@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id A17B819CC5; Tue, 6 Feb 2018 15:41:15 +0000 (UTC) (envelope-from arichardson@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w16FfF5Y038496; Tue, 6 Feb 2018 15:41:15 GMT (envelope-from arichardson@FreeBSD.org) Received: (from arichardson@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w16FfFsE038495; Tue, 6 Feb 2018 15:41:15 GMT (envelope-from arichardson@FreeBSD.org) Message-Id: <201802061541.w16FfFsE038495@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: arichardson set sender to arichardson@FreeBSD.org using -f From: Alex Richardson Date: Tue, 6 Feb 2018 15:41:15 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r328932 - head/sys/mips/mips X-SVN-Group: head X-SVN-Commit-Author: arichardson X-SVN-Commit-Paths: head/sys/mips/mips X-SVN-Commit-Revision: 328932 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Feb 2018 15:41:16 -0000 Author: arichardson Date: Tue Feb 6 15:41:15 2018 New Revision: 328932 URL: https://svnweb.freebsd.org/changeset/base/328932 Log: Make mips_postboot_fixup work when building the kernel with clang+lld The compiler/linker can align fake_preload anyway it would like. When building the kernel with gcc+bfd this always happened to be a multiple of 8. When I built the kernel with clang and linked with lld fake_preload happened to only be aligned to 4 bytes which caused a an ADDRS trap because the compiler will emit sd instructions to store to this buffer. Reviewed By: jhb, imp Approved By: jhb (mentor) Differential Revision: https://reviews.freebsd.org/D14018 Modified: head/sys/mips/mips/machdep.c Modified: head/sys/mips/mips/machdep.c ============================================================================== --- head/sys/mips/mips/machdep.c Tue Feb 6 15:30:17 2018 (r328931) +++ head/sys/mips/mips/machdep.c Tue Feb 6 15:41:15 2018 (r328932) @@ -383,7 +383,11 @@ mips_vector_init(void) void mips_postboot_fixup(void) { - static char fake_preload[256]; + /* + * We store u_long sized objects into the reload area, so the array + * must be so aligned. The standard allows any alignment for char data. + */ + static char fake_preload[256] _Alignas(_Alignof(u_long)); caddr_t preload_ptr = (caddr_t)&fake_preload[0]; size_t size = 0;