powerpc/boot: Add support for 64bit little endian wrapper
The code is only slightly modified : entry points now use the
FIXUP_ENDIAN trampoline to switch endian order. The 32bit wrapper
is kept for big endian kernels and 64bit is enforced for little
endian kernels with a PPC64_BOOT_WRAPPER config option.
The linker script is generated using the kernel preprocessor flags
to make use of the CONFIG_* definitions and the wrapper script is
modified to take into account the new elf64ppc format.
Finally, the zImage file is compiled as a position independent
executable (-pie) which makes it loadable at any address by the
firmware.
Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index 5889c44..1948cf8 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -40,6 +40,7 @@
binary=
gzip=.gz
pie=
+format=
# cross-compilation prefix
CROSS=
@@ -136,6 +137,14 @@
kernel=vmlinux
fi
+elfformat="`${CROSS}objdump -p "$kernel" | grep 'file format' | awk '{print $4}'`"
+case "$elfformat" in
+ elf64-powerpcle) format=elf64lppc ;;
+ elf64-powerpc) format=elf32ppc ;;
+ elf32-powerpc) format=elf32ppc ;;
+esac
+
+
platformo=$object/"$platform".o
lds=$object/zImage.lds
ext=strip
@@ -154,6 +163,10 @@
pseries)
platformo="$object/pseries-head.o $object/of.o $object/epapr.o"
link_address='0x4000000'
+ if [ "$format" != "elf32ppc" ]; then
+ link_address=
+ pie=-pie
+ fi
make_space=n
;;
maple)
@@ -379,7 +392,7 @@
if [ -n "$link_address" ] ; then
text_start="-Ttext $link_address"
fi
- ${CROSS}ld -m elf32ppc -T $lds $text_start $pie -o "$ofile" \
+ ${CROSS}ld -m $format -T $lds $text_start $pie -o "$ofile" \
$platformo $tmp $object/wrapper.a
rm $tmp
fi