The attached patch adds a new binary format driver that allows a special
variety of ELF to be used that permits the dynamic sections that comprise an
executable, its dynamic loader and its shared libaries and its stack and data
to be located anywhere within the address space.

This is used to provide shared libraries and shared executables (at least, as
far as the read-only dynamic sections go) on uClinux. Not only that, but the
same binaries can be run on MMU linux without a problem.

This is achieved by:

 (1) Passing loadmaps to the dynamic loader (or to a statically linked
     executable) to indicate the whereabouts of the various dynamic sections.

 (2) Using a GOT inside the program.

 (3) Passing setup_arg_pages() the stack pointer to be.

 (4) Allowing the arch greated control over how an executable is laid out in
     memory in MMU Linux.

 (5) Rewriting mm/nommu.c to support MAP_PRIVATE on files, thus allowing _mmap_
     to handle sharing of private-readonly mappings.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>