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Subject: Re: svn commit: r253802 - head/contrib/llvm/tools/clang/lib/Headers
From: David Chisnall <theraven@FreeBSD.org>
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To: Jilles Tjoelker <jilles@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