tree 67c07efa7ca72a24bcd5d893c83fb9b3f59dce77
parent ee7a2aa3d3fd10a7157dd19f737b2bafdea0458f
author Michael Ellerman <michael@ozlabs.org> 1302640735 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1303282760 +1000

powerpc/boot: Allow building the zImage wrapper as a relocatable ET_DYN

This patch adds code, linker script and makefile support to allow
building the zImage wrapper around the kernel as a position independent
executable.  This results in an ET_DYN instead of an ET_EXEC ELF output
file, which can be loaded at any location by the firmware and will
process its own relocations to work correctly at the loaded address.

This is of interest particularly since the standard ePAPR image format
must be an ET_DYN (although this patch alone is not sufficient to
produce a fully ePAPR compliant boot image).

Note for now we don't enable building with -pie for anything.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>