[POWERPC] Create a "wrapper" script and use it in arch/powerpc/boot

This puts the knowledge of how to create various sorts of zImage
wrappers into a script called "wrapper" that could be used outside of
the kernel tree.  This changes arch/powerpc/boot so it first builds
the files that the wrapper script needs, then runs it to create
whatever flavours of zImage are required.

This version does uImages as well.  The zImage names are changed
slightly; zImage.pseries is the one with the PT_NOTE program header
entry added, and zImage.pmac is the one without.  If the
zImage.pseries gets made, it will also get hardlinked to zImage;
otherwise, if zImage.pmac is made, it gets hardlinked to zImage.
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/Makefile

@@ -20,6 +20,7 @@ CROSS32_COMPILE ?=
 CROSS32CC		:= $(CROSS32_COMPILE)gcc
 CROSS32AS		:= $(CROSS32_COMPILE)as
 CROSS32LD		:= $(CROSS32_COMPILE)ld
+CROSS32AR		:= $(CROSS32_COMPILE)ar
 CROSS32OBJCOPY		:= $(CROSS32_COMPILE)objcopy
 
 ifeq ($(HAS_BIARCH),y)
@@ -28,10 +29,11 @@ CROSS32CC	:= $(CC) -m32
 CROSS32AS	:= $(AS) -a32
 CROSS32LD	:= $(LD) -m elf32ppc
 CROSS32OBJCOPY	:= $(OBJCOPY)
+CROSS32AR	:= $(AR)
 endif
 endif
 
-export CROSS32CC CROSS32AS CROSS32LD CROSS32OBJCOPY
+export CROSS32CC CROSS32AS CROSS32LD CROSS32AR CROSS32OBJCOPY
 
 KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
 
@@ -146,7 +148,7 @@ all: $(KBUILD_IMAGE)
 
 CPPFLAGS_vmlinux.lds	:= -Upowerpc
 
-BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm uImage vmlinux.bin
+BOOT_TARGETS = zImage zImage.initrd uImage
 
 PHONY += $(BOOT_TARGETS)
 

arch/powerpc/boot/wrapper

+#!/bin/sh
+
+# Copyright (C) 2006 Paul Mackerras, IBM Corporation <paulus@samba.org>
+# This program may be used under the terms of version 2 of the GNU
+# General Public License.
+
+# This script takes a kernel binary and optionally an initrd image
+# and/or a device-tree blob, and creates a bootable zImage for a
+# given platform.
+
+# Options:
+# -o zImage	specify output file
+# -p platform	specify platform (links in $platform.o)
+# -i initrd	specify initrd file
+# -d devtree	specify device-tree blob
+# -s tree.dts	specify device-tree source file (needs dtc installed)
+# -c		cache $kernel.strip.gz (use if present & newer, else make)
+# -C prefix	specify command prefix for cross-building tools
+#		(strip, objcopy, ld)
+# -D dir	specify directory containing data files used by script
+#		(default ./arch/powerpc/boot)
+# -W dir	specify working directory for temporary files (default .)
+
+# defaults
+kernel=
+ofile=zImage
+platform=of
+initrd=
+dtb=
+dts=
+cacheit=
+
+# cross-compilation prefix
+CROSS=
+
+# directory for object and other files used by this script
+object=arch/powerpc/boot
+
+# directory for working files
+tmpdir=.
+
+usage() {
+    echo 'Usage: wrapper [-o output] [-p platform] [-i initrd]' >&2
+    echo '       [-d devtree] [-s tree.dts] [-c] [-C cross-prefix]' >&2
+    echo '       [-D datadir] [-W workingdir] [vmlinux]' >&2
+    exit 1
+}
+
+while [ "$#" -gt 0 ]; do
+    case "$1" in
+    -o)
+	shift
+	[ "$#" -gt 0 ] || usage
+	ofile="$1"
+	;;
+    -p)
+	shift
+	[ "$#" -gt 0 ] || usage
+	platform="$1"
+	;;
+    -i)
+	shift
+	[ "$#" -gt 0 ] || usage
+	initrd="$1"
+	;;
+    -d)
+	shift
+	[ "$#" -gt 0 ] || usage
+	dtb="$1"
+	;;
+    -s)
+	shift
+	[ "$#" -gt 0 ] || usage
+	dts="$1"
+	;;
+    -c)
+	cacheit=y
+	;;
+    -C)
+	shift
+	[ "$#" -gt 0 ] || usage
+	CROSS="$1"
+	;;
+    -D)
+	shift
+	[ "$#" -gt 0 ] || usage
+	object="$1"
+	;;
+    -W)
+	shift
+	[ "$#" -gt 0 ] || usage
+	tmpdir="$1"
+	;;
+    -?)
+	usage
+	;;
+    *)
+	[ -z "$kernel" ] || usage
+	kernel="$1"
+	;;
+    esac
+    shift
+done
+
+if [ -n "$dts" ]; then
+    if [ -z "$dtb" ]; then
+	dtb="$platform.dtb"
+    fi
+    dtc -O dtb -o "$dtb" -b 0 -V 16 "$dts" || exit 1
+fi
+
+if [ -z "$kernel" ]; then
+    kernel=vmlinux
+fi
+
+platformo=$object/"$platform".o
+lds=$object/zImage.lds
+ext=strip
+objflags=-S
+tmp=$tmpdir/zImage.$$.o
+ksection=.kernel:vmlinux.strip
+isection=.kernel:initrd
+
+case "$platform" in
+pmac|pseries|chrp)
+    platformo=$object/of.o
+    ;;
+pmaccoff)
+    platformo=$object/of.o
+    lds=$object/zImage.coff.lds
+    ;;
+miboot|uboot)
+    # miboot and U-boot want just the bare bits, not an ELF binary
+    ext=bin
+    objflags="-O binary"
+    tmp="$ofile"
+    ksection=image
+    isection=initrd
+    ;;
+esac
+
+vmz="$tmpdir/`basename \"$kernel\"`.$ext"
+if [ -z "$cacheit" -o ! -f "$vmz.gz" -o "$vmz.gz" -ot "$kernel" ]; then
+    ${CROSS}objcopy $objflags "$kernel" "$vmz.$$"
+    gzip -f -9 "$vmz.$$"
+    if [ -n "$cacheit" ]; then
+	mv -f "$vmz.$$.gz" "$vmz.gz"
+    else
+	vmz="$vmz.$$"
+    fi
+fi
+
+case "$platform" in
+uboot)
+    rm -f "$ofile"
+    version=`${CROSS}strings "$kernel" | grep '^Linux version [-0-9.]' | \
+	cut -d' ' -f3`
+    if [ -n "$version" ]; then
+	version="-n Linux-$version"
+    fi
+    mkimage -A ppc -O linux -T kernel -C gzip -a 00000000 -e 00000000 \
+	$version -d "$vmz.gz" "$ofile"
+    if [ -z "$cacheit" ]; then
+	rm -f $vmz.gz
+    fi
+    exit 0
+    ;;
+esac
+
+addsec() {
+    ${CROSS}objcopy $4 $1 \
+	--add-section=$3="$2" \
+	--set-section-flags=$3=contents,alloc,load,readonly,data
+}
+
+addsec $tmp "$vmz.gz" $ksection $object/empty.o
+if [ -z "$cacheit" ]; then
+    rm -f "$vmz.gz"
+fi
+
+if [ -n "$initrd" ]; then
+    addsec $tmp "$initrd" initrd
+fi
+
+if [ -n "$dtb" ]; then
+    addsec $tmp "$dtb" dtb
+fi
+
+if [ "$platform" != "miboot" ]; then
+    ${CROSS}ld -m elf32ppc -T $lds -o "$ofile" \
+	$object/crt0.o $platformo $tmp $object/wrapper.a
+    rm $tmp
+fi
+
+# post-processing needed for some platforms
+case "$platform" in
+pseries|chrp)
+    $object/addnote "$ofile"
+    ;;
+pmaccoff)
+    ${CROSS}objcopy -O aixcoff-rs6000 --set-start 0x500000 "$ofile"
+    $object/hack-coff "$ofile"
+    ;;
+esac