Re: More linux emulation

[christos%astron.com@localhost (Christos Zoulas)]

In article <20140403192802.9D98112967%ren.fdy2.co.uk@localhost>,
Robert Swindells  <rjs%fdy2.co.uk@localhost> wrote:
>
>I have added a change to the arm copy of linux_syscall.c that lets
>it start running Debian armel binaries, I would expect armhf ones
>to run too.
>
>Current ARM Linux expects there to be some helper functions at the top
>of the high vectors page that can be called from userspace.
>
>These functions do things like compare-and-swap, memory barrier and
>give fast access to the TLS pointer. The idea is that they can have
>processor specific versions of these with a generic userland.
>
>Do people think it would be a bad idea to add this feature ?
>
>I haven't worked out what security issues there might be with it.
>
>Robert Swindells

I don't see that this is a problem. There is a lot of prior art doing similar
things (getpid() fast memcpy(), timer access etc).

christos