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

[Anil Madhavapeddy <anil@xxxxxxxxxxxxx>]

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

-anil

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