[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>
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 01667d1..a00fe72 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -20,6 +20,7 @@
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 @@
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 @@
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)
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index e737741..c383d56 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -20,27 +20,12 @@
# CROSS32_COMPILE is setup as a prefix just like CROSS_COMPILE
# in the toplevel makefile.
+all: $(obj)/zImage
HOSTCC := gcc
BOOTCFLAGS := $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem \
$(shell $(CROSS32CC) -print-file-name=include) -fPIC
BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
-OBJCOPYFLAGS := contents,alloc,load,readonly,data
-OBJCOPY_COFF_ARGS := -O aixcoff-rs6000 --set-start 0x500000
-OBJCOPY_MIB_ARGS := -O aixcoff-rs6000 -R .stab -R .stabstr -R .comment
-
-zlib := inffast.c inflate.c inftrees.c
-zlibheader := inffast.h inffixed.h inflate.h inftrees.h infutil.h
-zliblinuxheader := zlib.h zconf.h zutil.h
-
-$(addprefix $(obj)/,$(zlib) main.o): $(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader))
-#$(addprefix $(obj)/,main.o): $(addprefix $(obj)/,zlib.h)
-
-src-boot-$(CONFIG_PPC_MULTIPLATFORM) := of.c
-src-boot := crt0.S string.S stdio.c main.c div64.S $(src-boot-y)
-src-boot += $(zlib)
-src-boot := $(addprefix $(obj)/, $(src-boot))
-obj-boot := $(addsuffix .o, $(basename $(src-boot)))
ifeq ($(call cc-option-yn, -fstack-protector),y)
BOOTCFLAGS += -fno-stack-protector
@@ -48,6 +33,22 @@
BOOTCFLAGS += -I$(obj) -I$(srctree)/$(obj)
+zlib := inffast.c inflate.c inftrees.c
+zlibheader := inffast.h inffixed.h inflate.h inftrees.h infutil.h
+zliblinuxheader := zlib.h zconf.h zutil.h
+
+$(addprefix $(obj)/,$(zlib) main.o): $(addprefix $(obj)/,$(zliblinuxheader)) \
+ $(addprefix $(obj)/,$(zlibheader))
+
+src-wlib := string.S stdio.c main.c div64.S $(zlib)
+src-plat := of.c
+src-boot := crt0.S $(src-wlib) $(src-plat) empty.c
+
+src-boot := $(addprefix $(obj)/, $(src-boot))
+obj-boot := $(addsuffix .o, $(basename $(src-boot)))
+obj-wlib := $(addsuffix .o, $(basename $(addprefix $(obj)/, $(src-wlib))))
+obj-plat := $(addsuffix .o, $(basename $(addprefix $(obj)/, $(src-plat))))
+
quiet_cmd_copy_zlib = COPY $@
cmd_copy_zlib = sed "s@__attribute_used__@@;s@<linux/\([^>]\+\).*@\"\1\"@" $< > $@
@@ -66,8 +67,14 @@
$(addprefix $(obj)/,$(zliblinuxheader)): $(obj)/%: $(srctree)/include/linux/%
$(call cmd,copy_zliblinuxheader)
-clean-files := $(zlib) $(zlibheader) $(zliblinuxheader)
+$(obj)/empty.c:
+ @touch $@
+$(obj)/zImage.lds $(obj)/zImage.coff.lds: $(obj)/%: $(srctree)/$(src)/%.S
+ @cp $< $@
+
+clean-files := $(zlib) $(zlibheader) $(zliblinuxheader) \
+ $(obj)/empty.c
quiet_cmd_bootcc = BOOTCC $@
cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
@@ -75,146 +82,97 @@
quiet_cmd_bootas = BOOTAS $@
cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
-quiet_cmd_bootld = BOOTLD $@
- cmd_bootld = $(CROSS32LD) -T $(srctree)/$(src)/$(3) -o $@ $(2)
+quiet_cmd_bootar = BOOTAR $@
+ cmd_bootar = $(CROSS32AR) -cr $@.$$$$ $^; mv $@.$$$$ $@
$(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
$(call if_changed_dep,bootcc)
$(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
$(call if_changed_dep,bootas)
-#-----------------------------------------------------------
-# ELF sections within the zImage bootloader/wrapper
-#-----------------------------------------------------------
-required := vmlinux.strip
-initrd := initrd
+$(obj)/wrapper.a: $(obj-wlib)
+ $(call cmd,bootar)
-obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
-src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
-gz-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
+hostprogs-y := addnote addRamDisk hack-coff
-hostprogs-y := addnote addRamDisk hack-coff
+extra-y := $(obj)/crt0.o $(obj)/wrapper.a $(obj-plat) $(obj)/empty.o \
+ $(obj)/zImage.lds $(obj)/zImage.coff.lds
-targets += zImage.vmode zImage.initrd.vmode zImage zImage.initrd \
- zImage.coff zImage.initrd.coff miboot.image miboot.initrd.image \
- $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
- $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
- $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
- vmlinux.initrd dummy.o
-extra-y := initrd.o
+wrapper :=$(srctree)/$(src)/wrapper
+wrapperbits := $(extra-y) $(addprefix $(obj)/,addnote hack-coff)
-quiet_cmd_ramdisk = RAMDISK $@
- cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
+#############
+# Bits for building various flavours of zImage
-quiet_cmd_stripvm = STRIP $@
- cmd_stripvm = $(STRIP) -s -R .comment $< -o $@
+ifneq ($(CROSS32_COMPILE),)
+CROSSWRAP := -C $(CROSS32_COMPILE)
+else
+ifneq ($(CROSS_COMPILE),)
+CROSSWRAP := -C $(CROSS_COMPILE)
+endif
+endif
-vmlinux.strip: vmlinux
- $(call if_changed,stripvm)
-$(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz
- $(call if_changed,ramdisk)
+quiet_cmd_wrap = WRAP $@
+ cmd_wrap =$(wrapper) -c -o $@ -p $2 $(CROSSWRAP) vmlinux
+quiet_cmd_wrap_initrd = WRAP $@
+ cmd_wrap_initrd =$(wrapper) -c -o $@ -p $2 $(CROSSWRAP) \
+ -i $(obj)/ramdisk.image.gz vmlinux
-quiet_cmd_addsection = ADDSEC $@
- cmd_addsection = $(CROSS32OBJCOPY) $@ \
- --add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(patsubst %.o,%.gz, $@) \
- --set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(OBJCOPYFLAGS)
+$(obj)/zImage.chrp: vmlinux $(wrapperbits)
+ $(call cmd,wrap,chrp)
-quiet_cmd_addnote = ADDNOTE $@
- cmd_addnote = $(obj)/addnote $@
+$(obj)/zImage.initrd.chrp: vmlinux $(wrapperbits)
+ $(call cmd,wrap_initrd,chrp)
-quiet_cmd_gen-miboot = GEN $@
- cmd_gen-miboot = $(OBJCOPY) $(OBJCOPY_MIB_ARGS) \
- --add-section=$1=$(word 2, $^) $< $@
+$(obj)/zImage.pseries: vmlinux $(wrapperbits)
+ $(call cmd,wrap,pseries)
-quiet_cmd_gencoff = COFF $@
- cmd_gencoff = $(OBJCOPY) $(OBJCOPY_COFF_ARGS) $@ && \
- $(obj)/hack-coff $@
+$(obj)/zImage.initrd.pseries: vmlinux $(wrapperbits)
+ $(call cmd,wrap_initrd,pseries)
-$(call gz-sec, $(required)): $(obj)/kernel-%.gz: %
- $(call if_changed,gzip)
+$(obj)/zImage.pmac: vmlinux $(wrapperbits)
+ $(call cmd,wrap,pmac)
-$(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
- cp -f $(obj)/ramdisk.image.gz $@
+$(obj)/zImage.initrd.pmac: vmlinux $(wrapperbits)
+ $(call cmd,wrap_initrd,pmac)
-$(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz
- @touch $@
+$(obj)/zImage.coff: vmlinux $(wrapperbits)
+ $(call cmd,wrap,pmaccoff)
-$(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c
- $(call if_changed_dep,bootcc)
- $(call cmd,addsection)
+$(obj)/zImage.initrd.coff: vmlinux $(wrapperbits)
+ $(call cmd,wrap_initrd,pmaccoff)
-$(obj)/zImage.vmode $(obj)/zImage.coff: obj-boot += $(call obj-sec, $(required))
-$(obj)/zImage.vmode: $(call obj-sec, $(required)) $(obj-boot) $(srctree)/$(src)/zImage.lds
- $(call cmd,bootld,$(obj-boot),zImage.lds)
+$(obj)/zImage.miboot: vmlinux $(wrapperbits)
+ $(call cmd,wrap,miboot)
-$(obj)/zImage.initrd.vmode $(obj)/zImage.initrd.coff: obj-boot += $(call obj-sec, $(required) $(initrd))
-$(obj)/zImage.initrd.vmode: $(call obj-sec, $(required) $(initrd)) $(obj-boot) $(srctree)/$(src)/zImage.lds
- $(call cmd,bootld,$(obj-boot),zImage.lds)
+$(obj)/zImage.initrd.miboot: vmlinux $(wrapperbits)
+ $(call cmd,wrap_initrd,miboot)
+
+$(obj)/uImage: vmlinux $(wrapperbits)
+ $(call cmd,wrap,uboot)
+
+image-$(CONFIG_PPC_PSERIES) += zImage.pseries
+image-$(CONFIG_PPC_MAPLE) += zImage.pseries
+image-$(CONFIG_PPC_CELL) += zImage.pseries
+image-$(CONFIG_PPC_CHRP) += zImage.chrp
+image-$(CONFIG_PPC_PMAC) += zImage.pmac
+image-$(CONFIG_DEFAULT_UIMAGE) += uImage
# For 32-bit powermacs, build the COFF and miboot images
# as well as the ELF images.
-coffimage-$(CONFIG_PPC_PMAC)-$(CONFIG_PPC32) := $(obj)/zImage.coff
-coffrdimg-$(CONFIG_PPC_PMAC)-$(CONFIG_PPC32) := $(obj)/zImage.initrd.coff
-mibootimg-$(CONFIG_PPC_PMAC)-$(CONFIG_PPC32) := $(obj)/miboot.image
-mibrdimg-$(CONFIG_PPC_PMAC)-$(CONFIG_PPC32) := $(obj)/miboot.initrd.image
+ifeq ($(CONFIG_PPC32),y)
+image-$(CONFIG_PPC_PMAC) += zImage.coff zImage.miboot
+endif
-$(obj)/zImage: $(obj)/zImage.vmode $(obj)/addnote $(coffimage-y-y) \
- $(mibootimg-y-y)
- @cp -f $< $@
- $(call if_changed,addnote)
+initrd-y := $(patsubst zImage%, zImage.initrd%, $(image-y))
-$(obj)/zImage.initrd: $(obj)/zImage.initrd.vmode $(obj)/addnote \
- $(coffrdimg-y-y) $(mibrdimg-y-y)
- @cp -f $< $@
- $(call if_changed,addnote)
+$(obj)/zImage: $(addprefix $(obj)/, $(image-y))
+ @rm -f $@; ln $< $@
+$(obj)/zImage.initrd: $(addprefix $(obj)/, $(initrd-y))
+ @rm -f $@; ln $< $@
-$(obj)/zImage.coff: $(call obj-sec, $(required)) $(obj-boot) \
- $(srctree)/$(src)/zImage.coff.lds $(obj)/hack-coff
- $(call cmd,bootld,$(obj-boot),zImage.coff.lds)
- $(call cmd,gencoff)
+install: $(CONFIGURE) $(image-y)
+ sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" $<
-$(obj)/zImage.initrd.coff: $(call obj-sec, $(required) $(initrd)) $(obj-boot) \
- $(srctree)/$(src)/zImage.coff.lds $(obj)/hack-coff
- $(call cmd,bootld,$(obj-boot),zImage.coff.lds)
- $(call cmd,gencoff)
-
-$(obj)/miboot.image: $(obj)/dummy.o $(obj)/vmlinux.gz
- $(call cmd,gen-miboot,image)
-
-$(obj)/miboot.initrd.image: $(obj)/miboot.image $(images)/ramdisk.image.gz
- $(call cmd,gen-miboot,initrd)
-
-#-----------------------------------------------------------
-# build u-boot images
-#-----------------------------------------------------------
-quiet_cmd_mygzip = GZIP $@
-cmd_mygzip = gzip -f -9 < $< > $@.$$$$ && mv $@.$$$$ $@
-
-quiet_cmd_objbin = OBJCOPY $@
- cmd_objbin = $(OBJCOPY) -O binary $< $@
-
-quiet_cmd_uimage = UIMAGE $@
- cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A ppc -O linux -T kernel \
- -C gzip -a 00000000 -e 00000000 -n 'Linux-$(KERNELRELEASE)' \
- -d $< $@
-
-MKIMAGE := $(srctree)/scripts/mkuboot.sh
-targets += uImage
-extra-y += vmlinux.bin vmlinux.gz
-
-$(obj)/vmlinux.bin: vmlinux FORCE
- $(call if_changed,objbin)
-
-$(obj)/vmlinux.gz: $(obj)/vmlinux.bin FORCE
- $(call if_changed,mygzip)
-
-$(obj)/uImage: $(obj)/vmlinux.gz
- $(Q)rm -f $@
- $(call cmd,uimage)
- @echo -n ' Image: $@ '
- @if [ -f $@ ]; then echo 'is ready' ; else echo 'not made'; fi
-
-install: $(CONFIGURE) $(BOOTIMAGE)
- sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
-
-clean-files += $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)
+clean-files += $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip.gz)
+clean-files += $(addprefix $(objtree)/, $(obj-boot) vmlinux.bin.gz)
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
new file mode 100755
index 0000000..eab7318
--- /dev/null
+++ b/arch/powerpc/boot/wrapper
@@ -0,0 +1,204 @@
+#!/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
diff --git a/arch/powerpc/boot/zImage.coff.lds b/arch/powerpc/boot/zImage.coff.lds.S
similarity index 100%
rename from arch/powerpc/boot/zImage.coff.lds
rename to arch/powerpc/boot/zImage.coff.lds.S
diff --git a/arch/powerpc/boot/zImage.lds b/arch/powerpc/boot/zImage.lds.S
similarity index 100%
rename from arch/powerpc/boot/zImage.lds
rename to arch/powerpc/boot/zImage.lds.S
