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Re: [Xen-devel] [PATCH 1/3] Add support for OpenBSD

On 18 Oct 2006, at 16:24, Keir Fraser wrote:

On 17/10/06 15:30, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote:

I made the xen kernel buildable on OpenBSD.
The first patch touches the buildsystem.

Why is elf_{i386,x86_64}_obsd needed? Is OpenBSD so very special it needs
its own linkage target architecture?

If I remember, these emulations are for W^X support on OpenBSD when we switched to elf from a.out a couple of years ago; it links sections in different address areas so that segment registers (on i386 32-bit anyway) can be used to ensure that no pages are simultaneously writable and executable.

- http://www.openbsd.org/papers/ven05-deraadt/index.html


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