arch/powerpc/Makefile - kernel/msm-4.9 - Gitiles

 # This file is included by the global makefile so that you can add your own
 # architecture-specific flags and dependencies. Remember to do have actions
 # for "archclean" and "archdep" for cleaning up and making dependencies for
 # this architecture.
 #
 # This file is subject to the terms and conditions of the GNU General Public
 # License.  See the file "COPYING" in the main directory of this archive
 # for more details.
 #
 # Copyright (C) 1994 by Linus Torvalds
 # Changes for PPC by Gary Thomas
 # Rewritten by Cort Dougan and Paul Mackerras
 #

 HAS_BIARCH	:= $(call cc-option-yn, -m32)

 # Set default 32 bits cross compilers for vdso and boot wrapper
 CROSS32_COMPILE ?=

 CROSS32CC		:= $(CROSS32_COMPILE)gcc
 CROSS32AR		:= $(CROSS32_COMPILE)ar

 ifeq ($(HAS_BIARCH),y)
 ifeq ($(CROSS32_COMPILE),)
 CROSS32CC	:= $(CC) -m32
 CROSS32AR	:= GNUTARGET=elf32-powerpc $(AR)
 endif
 endif

 export CROSS32CC CROSS32AR

 ifeq ($(CROSS_COMPILE),)
 KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
 else
 KBUILD_DEFCONFIG := ppc64_defconfig
 endif

 ifeq ($(CONFIG_PPC64),y)
 new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)

 ifeq ($(new_nm),y)
 NM		:= $(NM) --synthetic
 endif
 endif

 ifeq ($(CONFIG_PPC64),y)
 ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
 OLDARCH	:= ppc64le
 else
 OLDARCH	:= ppc64
 endif
 else
 ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
 OLDARCH	:= ppcle
 else
 OLDARCH	:= ppc
 endif
 endif

 # It seems there are times we use this Makefile without
 # including the config file, but this replicates the old behaviour
 ifeq ($(CONFIG_WORD_SIZE),)
 CONFIG_WORD_SIZE := 32
 endif

 UTS_MACHINE := $(OLDARCH)

 ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
 override CC	+= -mlittle-endian -mno-strict-align
 override AS	+= -mlittle-endian
 override LD	+= -EL
 override CROSS32CC += -mlittle-endian
 override CROSS32AS += -mlittle-endian
 LDEMULATION	:= lppc
 GNUTARGET	:= powerpcle
 MULTIPLEWORD	:= -mno-multiple
 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
 else
 ifeq ($(call cc-option-yn,-mbig-endian),y)
 override CC	+= -mbig-endian
 override AS	+= -mbig-endian
 endif
 override LD	+= -EB
 LDEMULATION	:= ppc
 GNUTARGET	:= powerpc
 MULTIPLEWORD	:= -mmultiple
 endif

 ifeq ($(HAS_BIARCH),y)
 override AS	+= -a$(CONFIG_WORD_SIZE)
 override LD	+= -m elf$(CONFIG_WORD_SIZE)$(LDEMULATION)
 override CC	+= -m$(CONFIG_WORD_SIZE)
 override AR	:= GNUTARGET=elf$(CONFIG_WORD_SIZE)-$(GNUTARGET) $(AR)
 endif

 LDFLAGS_vmlinux-y := -Bstatic
 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
 LDFLAGS_vmlinux	:= $(LDFLAGS_vmlinux-y)

 ifeq ($(CONFIG_PPC64),y)
 ifeq ($(call cc-option-yn,-mcmodel=medium),y)
 	# -mcmodel=medium breaks modules because it uses 32bit offsets from
 	# the TOC pointer to create pointers where possible. Pointers into the
 	# percpu data area are created by this method.
 	#
 	# The kernel module loader relocates the percpu data section from the
 	# original location (starting with 0xd...) to somewhere in the base
 	# kernel percpu data space (starting with 0xc...). We need a full
 	# 64bit relocation for this to work, hence -mcmodel=large.
 	KBUILD_CFLAGS_MODULE += -mcmodel=large
 else
 	export NO_MINIMAL_TOC := -mno-minimal-toc
 endif
 endif

 CFLAGS-$(CONFIG_PPC64)	:= -mtraceback=no
 ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv2,-mcall-aixdesc)
 AFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv2)
 else
 CFLAGS-$(CONFIG_PPC64)	+= -mcall-aixdesc
 endif
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mcmodel=medium,-mminimal-toc)
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mno-pointers-to-nested-functions)
 CFLAGS-$(CONFIG_PPC32)	:= -ffixed-r2 $(MULTIPLEWORD)

 ifeq ($(CONFIG_PPC_BOOK3S_64),y)
 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,-mtune=power4)
 else
 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
 endif

 CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
 CFLAGS-$(CONFIG_POWER4_CPU) += $(call cc-option,-mcpu=power4)
 CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
 CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
 CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
 CFLAGS-$(CONFIG_POWER8_CPU) += $(call cc-option,-mcpu=power8)

 # Altivec option not allowed with e500mc64 in GCC.
 ifeq ($(CONFIG_ALTIVEC),y)
 E5500_CPU := -mcpu=powerpc64
 else
 E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
 endif
 CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
 CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))

 ifeq ($(CONFIG_PPC32),y)
 ifeq ($(CONFIG_PPC_E500MC),y)
 CFLAGS-y += $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
 else
 CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
 endif
 endif

 CFLAGS-$(CONFIG_TUNE_CELL) += $(call cc-option,-mtune=cell)

 asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)

 KBUILD_CPPFLAGS	+= -Iarch/$(ARCH) $(asinstr)
 KBUILD_AFLAGS	+= -Iarch/$(ARCH) $(AFLAGS-y)
 KBUILD_CFLAGS	+= -msoft-float -pipe -Iarch/$(ARCH) $(CFLAGS-y)
 CPP		= $(CC) -E $(KBUILD_CFLAGS)

 CHECKFLAGS	+= -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__

 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o

 ifeq ($(CONFIG_476FPE_ERR46),y)
 	KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
 		-T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
 endif

 # No AltiVec or VSX instructions when building kernel
 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
 KBUILD_CFLAGS += $(call cc-option,-mno-vsx)

 # No SPE instruction when building kernel
 # (We use all available options to help semi-broken compilers)
 KBUILD_CFLAGS += $(call cc-option,-mno-spe)
 KBUILD_CFLAGS += $(call cc-option,-mspe=no)

 # Enable unit-at-a-time mode when possible. It shrinks the
 # kernel considerably.
 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)

 # FIXME: the module load should be taught about the additional relocs
 # generated by this.
 # revert to pre-gcc-4.4 behaviour of .eh_frame
 KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)

 # Never use string load/store instructions as they are
 # often slow when they are implemented at all
 KBUILD_CFLAGS		+= -mno-string

 ifeq ($(CONFIG_6xx),y)
 KBUILD_CFLAGS		+= -mcpu=powerpc
 endif

 # Work around a gcc code-gen bug with -fno-omit-frame-pointer.
 ifeq ($(CONFIG_FUNCTION_TRACER),y)
 KBUILD_CFLAGS		+= -mno-sched-epilog
 endif

 cpu-as-$(CONFIG_4xx)		+= -Wa,-m405
 cpu-as-$(CONFIG_ALTIVEC)	+= -Wa,-maltivec
 cpu-as-$(CONFIG_E200)		+= -Wa,-me200

 KBUILD_AFLAGS += $(cpu-as-y)
 KBUILD_CFLAGS += $(cpu-as-y)

 head-y				:= arch/powerpc/kernel/head_$(CONFIG_WORD_SIZE).o
 head-$(CONFIG_8xx)		:= arch/powerpc/kernel/head_8xx.o
 head-$(CONFIG_40x)		:= arch/powerpc/kernel/head_40x.o
 head-$(CONFIG_44x)		:= arch/powerpc/kernel/head_44x.o
 head-$(CONFIG_FSL_BOOKE)	:= arch/powerpc/kernel/head_fsl_booke.o

 head-$(CONFIG_PPC64)		+= arch/powerpc/kernel/entry_64.o
 head-$(CONFIG_PPC_FPU)		+= arch/powerpc/kernel/fpu.o
 head-$(CONFIG_ALTIVEC)		+= arch/powerpc/kernel/vector.o
 head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE)  += arch/powerpc/kernel/prom_init.o

 core-y				+= arch/powerpc/kernel/ \
 				   arch/powerpc/mm/ \
 				   arch/powerpc/lib/ \
 				   arch/powerpc/sysdev/ \
 				   arch/powerpc/platforms/ \
 				   arch/powerpc/math-emu/ \
 				   arch/powerpc/crypto/ \
 				   arch/powerpc/net/
 core-$(CONFIG_XMON)		+= arch/powerpc/xmon/
 core-$(CONFIG_KVM) 		+= arch/powerpc/kvm/
 core-$(CONFIG_PERF_EVENTS)	+= arch/powerpc/perf/

 drivers-$(CONFIG_OPROFILE)	+= arch/powerpc/oprofile/

 # Default to zImage, override when needed
 all: zImage

 # With make 3.82 we cannot mix normal and wildcard targets
 BOOT_TARGETS1 := zImage zImage.initrd uImage
 BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%

 PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)

 boot := arch/$(ARCH)/boot

 ifeq ($(CONFIG_RELOCATABLE),y)
 quiet_cmd_relocs_check = CALL    $<
       cmd_relocs_check = perl $< "$(OBJDUMP)" "$(obj)/vmlinux"

 PHONY += relocs_check
 relocs_check: arch/powerpc/relocs_check.pl vmlinux
 	$(call cmd,relocs_check)

 zImage: relocs_check
 endif

 $(BOOT_TARGETS1): vmlinux
 	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
 $(BOOT_TARGETS2): vmlinux
 	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)


 bootwrapper_install:
 	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)

 %.dtb: scripts
 	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)

 define archhelp
   @echo '* zImage          - Build default images selected by kernel config'
   @echo '  zImage.*        - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
   @echo '  uImage          - U-Boot native image format'
   @echo '  cuImage.<dt>    - Backwards compatible U-Boot image for older'
   @echo '                    versions which do not support device trees'
   @echo '  dtbImage.<dt>   - zImage with an embedded device tree blob'
   @echo '  simpleImage.<dt> - Firmware independent image.'
   @echo '  treeImage.<dt>  - Support for older IBM 4xx firmware (not U-Boot)'
   @echo '  install         - Install kernel using'
   @echo '                    (your) ~/bin/$(INSTALLKERNEL) or'
   @echo '                    (distribution) /sbin/$(INSTALLKERNEL) or'
   @echo '                    install to $$(INSTALL_PATH) and run lilo'
   @echo '  *_defconfig     - Select default config from arch/$(ARCH)/configs'
   @echo ''
   @echo '  Targets with <dt> embed a device tree blob inside the image'
   @echo '  These targets support board with firmware that does not'
   @echo '  support passing a device tree directly.  Replace <dt> with the'
   @echo '  name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
   @echo '  (minus the .dts extension).'
 endef

 install:
 	$(Q)$(MAKE) $(build)=$(boot) install

 vdso_install:
 ifeq ($(CONFIG_PPC64),y)
 	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
 endif
 	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@

 archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)

 archprepare: checkbin

 # Use the file '.tmp_gas_check' for binutils tests, as gas won't output
 # to stdout and these checks are run even on install targets.
 TOUT	:= .tmp_gas_check

 # Check gcc and binutils versions:
 # - gcc-3.4 and binutils-2.14 are a fatal combination
 # - Require gcc 4.0 or above on 64-bit
 # - gcc-4.2.0 has issues compiling modules on 64-bit
 checkbin:
 	@if test "$(call cc-version)" = "0304" ; then \
 		if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
 			echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
 			echo 'correctly with gcc-3.4 and your version of binutils.'; \
 			echo '*** Please upgrade your binutils or downgrade your gcc'; \
 			false; \
 		fi ; \
 	fi
 	@if test "$(call cc-version)" -lt "0400" \
 	    && test "x${CONFIG_PPC64}" = "xy" ; then \
                 echo -n "Sorry, GCC v4.0 or above is required to build " ; \
                 echo "the 64-bit powerpc kernel." ; \
                 false ; \
         fi
 	@if test "$(call cc-fullversion)" = "040200" \
 	    && test "x${CONFIG_MODULES}${CONFIG_PPC64}" = "xyy" ; then \
 		echo -n '*** GCC-4.2.0 cannot compile the 64-bit powerpc ' ; \
 		echo 'kernel with modules enabled.' ; \
 		echo -n '*** Please use a different GCC version or ' ; \
 		echo 'disable kernel modules' ; \
 		false ; \
 	fi

 CLEAN_FILES += $(TOUT)
	# This file is included by the global makefile so that you can add your own
	# architecture-specific flags and dependencies. Remember to do have actions
	# for "archclean" and "archdep" for cleaning up and making dependencies for
	# this architecture.
	#
	# This file is subject to the terms and conditions of the GNU General Public
	# License. See the file "COPYING" in the main directory of this archive
	# for more details.
	#
	# Copyright (C) 1994 by Linus Torvalds
	# Changes for PPC by Gary Thomas
	# Rewritten by Cort Dougan and Paul Mackerras
	#

	HAS_BIARCH := $(call cc-option-yn, -m32)

	# Set default 32 bits cross compilers for vdso and boot wrapper
	CROSS32_COMPILE ?=

	CROSS32CC := $(CROSS32_COMPILE)gcc
	CROSS32AR := $(CROSS32_COMPILE)ar

	ifeq ($(HAS_BIARCH),y)
	ifeq ($(CROSS32_COMPILE),)
	CROSS32CC := $(CC) -m32
	CROSS32AR := GNUTARGET=elf32-powerpc $(AR)
	endif
	endif

	export CROSS32CC CROSS32AR

	ifeq ($(CROSS_COMPILE),)
	KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
	else
	KBUILD_DEFCONFIG := ppc64_defconfig
	endif

	ifeq ($(CONFIG_PPC64),y)
	new_nm := $(shell if $(NM) --help 2>&1 \| grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)

	ifeq ($(new_nm),y)
	NM := $(NM) --synthetic
	endif
	endif

	ifeq ($(CONFIG_PPC64),y)
	ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
	OLDARCH := ppc64le
	else
	OLDARCH := ppc64
	endif
	else
	ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
	OLDARCH := ppcle
	else
	OLDARCH := ppc
	endif
	endif

	# It seems there are times we use this Makefile without
	# including the config file, but this replicates the old behaviour
	ifeq ($(CONFIG_WORD_SIZE),)
	CONFIG_WORD_SIZE := 32
	endif

	UTS_MACHINE := $(OLDARCH)

	ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
	override CC += -mlittle-endian -mno-strict-align
	override AS += -mlittle-endian
	override LD += -EL
	override CROSS32CC += -mlittle-endian
	override CROSS32AS += -mlittle-endian
	LDEMULATION := lppc
	GNUTARGET := powerpcle
	MULTIPLEWORD := -mno-multiple
	KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
	else
	ifeq ($(call cc-option-yn,-mbig-endian),y)
	override CC += -mbig-endian
	override AS += -mbig-endian
	endif
	override LD += -EB
	LDEMULATION := ppc
	GNUTARGET := powerpc
	MULTIPLEWORD := -mmultiple
	endif

	ifeq ($(HAS_BIARCH),y)
	override AS += -a$(CONFIG_WORD_SIZE)
	override LD += -m elf$(CONFIG_WORD_SIZE)$(LDEMULATION)
	override CC += -m$(CONFIG_WORD_SIZE)
	override AR := GNUTARGET=elf$(CONFIG_WORD_SIZE)-$(GNUTARGET) $(AR)
	endif

	LDFLAGS_vmlinux-y := -Bstatic
	LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
	LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)

	ifeq ($(CONFIG_PPC64),y)
	ifeq ($(call cc-option-yn,-mcmodel=medium),y)
	# -mcmodel=medium breaks modules because it uses 32bit offsets from
	# the TOC pointer to create pointers where possible. Pointers into the
	# percpu data area are created by this method.
	#
	# The kernel module loader relocates the percpu data section from the
	# original location (starting with 0xd...) to somewhere in the base
	# kernel percpu data space (starting with 0xc...). We need a full
	# 64bit relocation for this to work, hence -mcmodel=large.
	KBUILD_CFLAGS_MODULE += -mcmodel=large
	else
	export NO_MINIMAL_TOC := -mno-minimal-toc
	endif
	endif

	CFLAGS-$(CONFIG_PPC64) := -mtraceback=no
	ifeq ($(CONFIG_CPU_LITTLE_ENDIAN),y)
	CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,-mcall-aixdesc)
	AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
	else
	CFLAGS-$(CONFIG_PPC64) += -mcall-aixdesc
	endif
	CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,-mminimal-toc)
	CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)
	CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 $(MULTIPLEWORD)

	ifeq ($(CONFIG_PPC_BOOK3S_64),y)
	CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,-mtune=power4)
	else
	CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
	endif

	CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
	CFLAGS-$(CONFIG_POWER4_CPU) += $(call cc-option,-mcpu=power4)
	CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
	CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
	CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
	CFLAGS-$(CONFIG_POWER8_CPU) += $(call cc-option,-mcpu=power8)

	# Altivec option not allowed with e500mc64 in GCC.
	ifeq ($(CONFIG_ALTIVEC),y)
	E5500_CPU := -mcpu=powerpc64
	else
	E5500_CPU := $(call cc-option,-mcpu=e500mc64,-mcpu=powerpc64)
	endif
	CFLAGS-$(CONFIG_E5500_CPU) += $(E5500_CPU)
	CFLAGS-$(CONFIG_E6500_CPU) += $(call cc-option,-mcpu=e6500,$(E5500_CPU))

	ifeq ($(CONFIG_PPC32),y)
	ifeq ($(CONFIG_PPC_E500MC),y)
	CFLAGS-y += $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
	else
	CFLAGS-$(CONFIG_E500) += $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
	endif
	endif

	CFLAGS-$(CONFIG_TUNE_CELL) += $(call cc-option,-mtune=cell)

	asinstr := $(call as-instr,lis 9$(comma)foo@high,-DHAVE_AS_ATHIGH=1)

	KBUILD_CPPFLAGS += -Iarch/$(ARCH) $(asinstr)
	KBUILD_AFLAGS += -Iarch/$(ARCH) $(AFLAGS-y)
	KBUILD_CFLAGS += -msoft-float -pipe -Iarch/$(ARCH) $(CFLAGS-y)
	CPP = $(CC) -E $(KBUILD_CFLAGS)

	CHECKFLAGS += -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__

	KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o

	ifeq ($(CONFIG_476FPE_ERR46),y)
	KBUILD_LDFLAGS_MODULE += --ppc476-workaround \
	-T $(srctree)/arch/powerpc/platforms/44x/ppc476_modules.lds
	endif

	# No AltiVec or VSX instructions when building kernel
	KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
	KBUILD_CFLAGS += $(call cc-option,-mno-vsx)

	# No SPE instruction when building kernel
	# (We use all available options to help semi-broken compilers)
	KBUILD_CFLAGS += $(call cc-option,-mno-spe)
	KBUILD_CFLAGS += $(call cc-option,-mspe=no)

	# Enable unit-at-a-time mode when possible. It shrinks the
	# kernel considerably.
	KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)

	# FIXME: the module load should be taught about the additional relocs
	# generated by this.
	# revert to pre-gcc-4.4 behaviour of .eh_frame
	KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)

	# Never use string load/store instructions as they are
	# often slow when they are implemented at all
	KBUILD_CFLAGS += -mno-string

	ifeq ($(CONFIG_6xx),y)
	KBUILD_CFLAGS += -mcpu=powerpc
	endif

	# Work around a gcc code-gen bug with -fno-omit-frame-pointer.
	ifeq ($(CONFIG_FUNCTION_TRACER),y)
	KBUILD_CFLAGS += -mno-sched-epilog
	endif

	cpu-as-$(CONFIG_4xx) += -Wa,-m405
	cpu-as-$(CONFIG_ALTIVEC) += -Wa,-maltivec
	cpu-as-$(CONFIG_E200) += -Wa,-me200

	KBUILD_AFLAGS += $(cpu-as-y)
	KBUILD_CFLAGS += $(cpu-as-y)

	head-y := arch/powerpc/kernel/head_$(CONFIG_WORD_SIZE).o
	head-$(CONFIG_8xx) := arch/powerpc/kernel/head_8xx.o
	head-$(CONFIG_40x) := arch/powerpc/kernel/head_40x.o
	head-$(CONFIG_44x) := arch/powerpc/kernel/head_44x.o
	head-$(CONFIG_FSL_BOOKE) := arch/powerpc/kernel/head_fsl_booke.o

	head-$(CONFIG_PPC64) += arch/powerpc/kernel/entry_64.o
	head-$(CONFIG_PPC_FPU) += arch/powerpc/kernel/fpu.o
	head-$(CONFIG_ALTIVEC) += arch/powerpc/kernel/vector.o
	head-$(CONFIG_PPC_OF_BOOT_TRAMPOLINE) += arch/powerpc/kernel/prom_init.o

	core-y += arch/powerpc/kernel/ \
	arch/powerpc/mm/ \
	arch/powerpc/lib/ \
	arch/powerpc/sysdev/ \
	arch/powerpc/platforms/ \
	arch/powerpc/math-emu/ \
	arch/powerpc/crypto/ \
	arch/powerpc/net/
	core-$(CONFIG_XMON) += arch/powerpc/xmon/
	core-$(CONFIG_KVM) += arch/powerpc/kvm/
	core-$(CONFIG_PERF_EVENTS) += arch/powerpc/perf/

	drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/

	# Default to zImage, override when needed
	all: zImage

	# With make 3.82 we cannot mix normal and wildcard targets
	BOOT_TARGETS1 := zImage zImage.initrd uImage
	BOOT_TARGETS2 := zImage% dtbImage% treeImage.% cuImage.% simpleImage.% uImage.%

	PHONY += $(BOOT_TARGETS1) $(BOOT_TARGETS2)

	boot := arch/$(ARCH)/boot

	ifeq ($(CONFIG_RELOCATABLE),y)
	quiet_cmd_relocs_check = CALL $<
	cmd_relocs_check = perl $< "$(OBJDUMP)" "$(obj)/vmlinux"

	PHONY += relocs_check
	relocs_check: arch/powerpc/relocs_check.pl vmlinux
	$(call cmd,relocs_check)

	zImage: relocs_check
	endif

	$(BOOT_TARGETS1): vmlinux
	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)
	$(BOOT_TARGETS2): vmlinux
	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)


	bootwrapper_install:
	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)

	%.dtb: scripts
	$(Q)$(MAKE) ARCH=ppc64 $(build)=$(boot) $(patsubst %,$(boot)/%,$@)

	define archhelp
	@echo '* zImage - Build default images selected by kernel config'
	@echo ' zImage.* - Compressed kernel image (arch/$(ARCH)/boot/zImage.*)'
	@echo ' uImage - U-Boot native image format'
	@echo ' cuImage.<dt> - Backwards compatible U-Boot image for older'
	@echo ' versions which do not support device trees'
	@echo ' dtbImage.<dt> - zImage with an embedded device tree blob'
	@echo ' simpleImage.<dt> - Firmware independent image.'
	@echo ' treeImage.<dt> - Support for older IBM 4xx firmware (not U-Boot)'
	@echo ' install - Install kernel using'
	@echo ' (your) ~/bin/$(INSTALLKERNEL) or'
	@echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
	@echo ' install to $$(INSTALL_PATH) and run lilo'
	@echo ' *_defconfig - Select default config from arch/$(ARCH)/configs'
	@echo ''
	@echo ' Targets with <dt> embed a device tree blob inside the image'
	@echo ' These targets support board with firmware that does not'
	@echo ' support passing a device tree directly. Replace <dt> with the'
	@echo ' name of a dts file from the arch/$(ARCH)/boot/dts/ directory'
	@echo ' (minus the .dts extension).'
	endef

	install:
	$(Q)$(MAKE) $(build)=$(boot) install

	vdso_install:
	ifeq ($(CONFIG_PPC64),y)
	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
	endif
	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@

	archclean:
	$(Q)$(MAKE) $(clean)=$(boot)

	archprepare: checkbin

	# Use the file '.tmp_gas_check' for binutils tests, as gas won't output
	# to stdout and these checks are run even on install targets.
	TOUT := .tmp_gas_check

	# Check gcc and binutils versions:
	# - gcc-3.4 and binutils-2.14 are a fatal combination
	# - Require gcc 4.0 or above on 64-bit
	# - gcc-4.2.0 has issues compiling modules on 64-bit
	checkbin:
	@if test "$(call cc-version)" = "0304" ; then \
	if ! /bin/echo mftb 5 \| $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
	echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
	echo 'correctly with gcc-3.4 and your version of binutils.'; \
	echo '*** Please upgrade your binutils or downgrade your gcc'; \
	false; \
	fi ; \
	fi
	@if test "$(call cc-version)" -lt "0400" \
	&& test "x${CONFIG_PPC64}" = "xy" ; then \
	echo -n "Sorry, GCC v4.0 or above is required to build " ; \
	echo "the 64-bit powerpc kernel." ; \
	false ; \
	fi
	@if test "$(call cc-fullversion)" = "040200" \
	&& test "x${CONFIG_MODULES}${CONFIG_PPC64}" = "xyy" ; then \
	echo -n '*** GCC-4.2.0 cannot compile the 64-bit powerpc ' ; \
	echo 'kernel with modules enabled.' ; \
	echo -n '*** Please use a different GCC version or ' ; \
	echo 'disable kernel modules' ; \
	false ; \
	fi

	CLEAN_FILES += $(TOUT)