Date: Thu, 8 Aug 2013 09:37:02 +0100 From: David Chisnall <theraven@FreeBSD.org> To: Jilles Tjoelker <jilles@stack.nl> Cc: "svn-src-head@FreeBSD.org" <svn-src-head@FreeBSD.org>, Matthew Fleming <mdf@FreeBSD.org>, "svn-src-all@FreeBSD.org" <svn-src-all@FreeBSD.org>, "src-committers@FreeBSD.org" <src-committers@FreeBSD.org>, Dimitry Andric <dim@FreeBSD.org> Subject: Re: svn commit: r253802 - head/contrib/llvm/tools/clang/lib/Headers Message-ID: <46BC9A7E-4AF1-4BE9-9902-3578BDE0CD56@FreeBSD.org> In-Reply-To: <20130807205653.GB4918@stack.nl> References: <201307301233.r6UCXLT8012177@svn.freebsd.org> <CAMBSHm8xDvWsKJiLAzPF8azMKLHq3WWWQ3X1d6-6nJSAppux9Q@mail.gmail.com> <2DE35C45-B110-4D93-BFA7-542A3D1EE902@freebsd.org> <20130807205653.GB4918@stack.nl>
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On 7 Aug 2013, at 21:56, Jilles Tjoelker <jilles@stack.nl> wrote: > The code_model stuff is not for x32 support but for PIC/PIE code where > code+data exceed 2GB so relative addressing cannot always be used. The > ABI then prescribes that %r15 be loaded with the GOT pointer when > invoking a large model (code>2GB) PLT entry; otherwise (medium model = or > no PLT entry used), much like i386, any register can be used for the = GOT > pointer. Does our rtld provide support for this? We recently encountered a = problem with the new LLVM JIT because FreeBSD's mmap() does not provide = a way of requesting memory that is below the 2GB line and so we can't = use the small code model. David
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