Segmented Stack support for X64-MinGW

[Reid Kleckner]

The patch looks good, and I'll commit if klutzy acknowledges on
llvm-commits that they want it upstream.  I just want to comply with the
attribution policy:
http://llvm.org/docs/DeveloperPolicy.html#attribution-of-changes

I'm not sure how wise it is to touch pvArbitrary, but hey, we do it for
32-bit.  *shrug*


On Mon, Mar 31, 2014 at 5:04 PM, Alex Crichton <alex at crichton.co> wrote:

> As part of the ongoing effort to upstream the patches that we're using
> with the Rust language, this is a patch which adds support for
> segmented stacks on 64-bit windows using MinGW. The original author
> was @klutzy on GitHub [1], and I've just added some tests to it.
>
> The implementation is the same as the 32-bit windows implementation by
> assuming that the stack limit is in the TIB's arbitrary data slot [2].
> The location of the TIB is slightly different, being pointed to by %gs
> instead of %fs [3].
>
> If anything else is required, please just let me know!
>
> [1] - https://github.com/rust-lang/llvm/commit/12d885
> [2] - http://en.wikipedia.org/wiki/Win32_Thread_Information_Block
> [3] - http://en.wikipedia.org/wiki/X86-64
>
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