arch/powerpc/Makefile - kernel/common - Git at Google

 # 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 ?=

 ifeq ($(HAS_BIARCH),y)
 ifeq ($(CROSS32_COMPILE),)
 ifdef CONFIG_PPC32
 # These options will be overridden by any -mcpu option that the CPU
 # or platform code sets later on the command line, but they are needed
 # to set a sane 32-bit cpu target for the 64-bit cross compiler which
 # may default to the wrong ISA.
 KBUILD_CFLAGS		+= -mcpu=powerpc
 KBUILD_AFLAGS		+= -mcpu=powerpc
 endif
 endif
 endif

 ifdef CONFIG_PPC_BOOK3S_32
 KBUILD_CFLAGS		+= -mcpu=powerpc
 endif

 # If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
 # ppc64_defconfig because we have nothing better to go on.
 uname := $(shell uname -m)
 KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig

 ifdef CONFIG_PPC64
 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

 # BITS is used as extension for files which are available in a 32 bit
 # and a 64 bit version to simplify shared Makefiles.
 # e.g.: obj-y += foo_$(BITS).o
 export BITS

 ifdef CONFIG_PPC64
         BITS := 64
 else
         BITS := 32
 endif

 machine-y = ppc
 machine-$(CONFIG_PPC64) += 64
 machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
 UTS_MACHINE := $(subst $(space),,$(machine-y))

 # XXX This needs to be before we override LD below
 ifdef CONFIG_PPC32
 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
 else
 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/powerpc/kernel/module.lds
 ifeq ($(call ld-ifversion, -ge, 225000000, y),y)
 # Have the linker provide sfpr if possible.
 # There is a corresponding test in arch/powerpc/lib/Makefile
 KBUILD_LDFLAGS_MODULE += --save-restore-funcs
 else
 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
 endif
 endif

 ifdef CONFIG_CPU_LITTLE_ENDIAN
 KBUILD_CFLAGS	+= -mlittle-endian
 KBUILD_LDFLAGS	+= -EL
 LDEMULATION	:= lppc
 GNUTARGET	:= powerpcle
 MULTIPLEWORD	:= -mno-multiple
 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
 else
 KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
 KBUILD_LDFLAGS	+= -EB
 LDEMULATION	:= ppc
 GNUTARGET	:= powerpc
 MULTIPLEWORD	:= -mmultiple
 endif

 ifdef CONFIG_PPC64
 cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mabi=elfv1)
 cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mcall-aixdesc)
 aflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mabi=elfv1)
 aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mabi=elfv2
 endif

 ifndef CONFIG_CC_IS_CLANG
   cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mno-strict-align
 endif

 cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mbig-endian)
 cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mlittle-endian
 aflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mbig-endian)
 aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mlittle-endian

 ifeq ($(HAS_BIARCH),y)
 KBUILD_CFLAGS	+= -m$(BITS)
 KBUILD_AFLAGS	+= -m$(BITS) -Wl,-a$(BITS)
 KBUILD_LDFLAGS	+= -m elf$(BITS)$(LDEMULATION)
 KBUILD_ARFLAGS	+= --target=elf$(BITS)-$(GNUTARGET)
 endif

 cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard=tls
 ifdef CONFIG_PPC64
 cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard-reg=r13
 else
 cflags-$(CONFIG_STACKPROTECTOR)	+= -mstack-protector-guard-reg=r2
 endif

 LDFLAGS_vmlinux-y := -Bstatic
 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
 LDFLAGS_vmlinux	:= $(LDFLAGS_vmlinux-y)
 LDFLAGS_vmlinux += $(call ld-option,--orphan-handling=warn)

 ifdef CONFIG_PPC64
 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)	:= $(call cc-option,-mtraceback=no)
 ifdef CONFIG_CPU_LITTLE_ENDIAN
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
 AFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv2)
 else
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv1)
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mcall-aixdesc)
 AFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mabi=elfv1)
 endif
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
 CFLAGS-$(CONFIG_PPC64)	+= $(call cc-option,-mno-pointers-to-nested-functions)

 # Clang unconditionally reserves r2 on ppc32 and does not support the flag
 # https://bugs.llvm.org/show_bug.cgi?id=39555
 CFLAGS-$(CONFIG_PPC32)	:= $(call cc-option, -ffixed-r2)

 # Clang doesn't support -mmultiple / -mno-multiple
 # https://bugs.llvm.org/show_bug.cgi?id=39556
 CFLAGS-$(CONFIG_PPC32)	+= $(call cc-option, $(MULTIPLEWORD))

 CFLAGS-$(CONFIG_PPC32)	+= $(call cc-option,-mno-readonly-in-sdata)

 ifdef CONFIG_PPC_BOOK3S_64
 ifdef CONFIG_CPU_LITTLE_ENDIAN
 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
 else
 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
 CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
 endif
 else
 CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
 endif

 ifdef CONFIG_FUNCTION_TRACER
 CC_FLAGS_FTRACE := -pg
 ifdef CONFIG_MPROFILE_KERNEL
 CC_FLAGS_FTRACE += -mprofile-kernel
 endif
 # Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
 ifndef CONFIG_CC_IS_CLANG
 CC_FLAGS_FTRACE	+= $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
 endif
 endif

 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))

 # Altivec option not allowed with e500mc64 in GCC.
 ifdef CONFIG_ALTIVEC
 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))

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

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

 KBUILD_CPPFLAGS	+= -I $(srctree)/arch/$(ARCH) $(asinstr)
 KBUILD_AFLAGS	+= $(AFLAGS-y)
 KBUILD_CFLAGS	+= $(call cc-option,-msoft-float)
 KBUILD_CFLAGS	+= -pipe $(CFLAGS-y)
 CPP		= $(CC) -E $(KBUILD_CFLAGS)

 CHECKFLAGS	+= -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
 ifdef CONFIG_CPU_BIG_ENDIAN
 CHECKFLAGS	+= -D__BIG_ENDIAN__
 else
 CHECKFLAGS	+= -D__LITTLE_ENDIAN__
 endif

 ifdef CONFIG_476FPE_ERR46
 	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)

 # 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		+= $(call cc-option,-mno-string)

 cpu-as-$(CONFIG_4xx)		+= -Wa,-m405
 cpu-as-$(CONFIG_ALTIVEC)	+= $(call as-option,-Wa$(comma)-maltivec)
 cpu-as-$(CONFIG_E200)		+= -Wa,-me200
 cpu-as-$(CONFIG_E500)		+= -Wa,-me500

 # When using '-many -mpower4' gas will first try and find a matching power4
 # mnemonic and failing that it will allow any valid mnemonic that GAS knows
 # about. GCC will pass -many to GAS when assembling, clang does not.
 cpu-as-$(CONFIG_PPC_BOOK3S_64)	+= -Wa,-mpower4 -Wa,-many
 cpu-as-$(CONFIG_PPC_E500MC)	+= $(call as-option,-Wa$(comma)-me500mc)

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

 KBUILD_AFLAGS += $(aflags-y)
 KBUILD_CFLAGS += $(cflags-y)

 head-y				:= arch/powerpc/kernel/head_$(BITS).o
 head-$(CONFIG_PPC_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

 # See arch/powerpc/Kbuild for content of core part of the kernel
 core-y += arch/powerpc/

 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

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


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

 # Used to create 'merged defconfigs'
 # To use it $(call) it with the first argument as the base defconfig
 # and the second argument as a space separated list of .config files to merge,
 # without the .config suffix.
 define merge_into_defconfig
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
 		-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
 		$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
 	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 endef

 PHONY += pseries_le_defconfig
 pseries_le_defconfig:
 	$(call merge_into_defconfig,pseries_defconfig,le)

 PHONY += ppc64le_defconfig
 ppc64le_defconfig:
 	$(call merge_into_defconfig,ppc64_defconfig,le)

 PHONY += ppc64le_guest_defconfig
 ppc64le_guest_defconfig:
 	$(call merge_into_defconfig,ppc64_defconfig,le guest)

 PHONY += ppc64_guest_defconfig
 ppc64_guest_defconfig:
 	$(call merge_into_defconfig,ppc64_defconfig,be guest)

 PHONY += powernv_be_defconfig
 powernv_be_defconfig:
 	$(call merge_into_defconfig,powernv_defconfig,be)

 PHONY += mpc85xx_defconfig
 mpc85xx_defconfig:
 	$(call merge_into_defconfig,mpc85xx_basic_defconfig,\
 		85xx-32bit 85xx-hw fsl-emb-nonhw)

 PHONY += mpc85xx_smp_defconfig
 mpc85xx_smp_defconfig:
 	$(call merge_into_defconfig,mpc85xx_basic_defconfig,\
 		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)

 PHONY += corenet32_smp_defconfig
 corenet32_smp_defconfig:
 	$(call merge_into_defconfig,corenet_basic_defconfig,\
 		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)

 PHONY += corenet64_smp_defconfig
 corenet64_smp_defconfig:
 	$(call merge_into_defconfig,corenet_basic_defconfig,\
 		85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)

 PHONY += mpc86xx_defconfig
 mpc86xx_defconfig:
 	$(call merge_into_defconfig,mpc86xx_basic_defconfig,\
 		86xx-hw fsl-emb-nonhw)

 PHONY += mpc86xx_smp_defconfig
 mpc86xx_smp_defconfig:
 	$(call merge_into_defconfig,mpc86xx_basic_defconfig,\
 		86xx-smp 86xx-hw fsl-emb-nonhw)

 PHONY += ppc32_allmodconfig
 ppc32_allmodconfig:
 	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
 		-f $(srctree)/Makefile allmodconfig

 PHONY += ppc_defconfig
 ppc_defconfig:
 	$(call merge_into_defconfig,book3s_32.config,)

 PHONY += ppc64le_allmodconfig
 ppc64le_allmodconfig:
 	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
 		-f $(srctree)/Makefile allmodconfig

 PHONY += ppc64_book3e_allmodconfig
 ppc64_book3e_allmodconfig:
 	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
 		-f $(srctree)/Makefile allmodconfig

 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:
 ifdef CONFIG_PPC64
 	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
 endif
 ifdef CONFIG_VDSO32
 	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
 endif

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

 archprepare: checkbin

 archheaders:
 	$(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all

 ifdef CONFIG_STACKPROTECTOR
 prepare: stack_protector_prepare

 stack_protector_prepare: prepare0
 ifdef CONFIG_PPC64
 	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
 else
 	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
 endif
 endif

 ifdef CONFIG_SMP
 prepare: task_cpu_prepare

 task_cpu_prepare: prepare0
 	$(eval KBUILD_CFLAGS += -D_TASK_CPU=$(shell awk '{if ($$2 == "TASK_CPU") print $$3;}' include/generated/asm-offsets.h))
 endif

 # Check toolchain versions:
 # - gcc-4.6 is the minimum kernel-wide version so nothing required.
 checkbin:
 	@if test "x${CONFIG_CPU_LITTLE_ENDIAN}" = "xy" \
 	    && $(LD) --version | head -1 | grep ' 2\.24$$' >/dev/null ; then \
 		echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
 		echo 'in some circumstances.' ; \
 		echo -n '*** Please use a different binutils version.' ; \
 		false ; \
 	fi
	# 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 ?=

	ifeq ($(HAS_BIARCH),y)
	ifeq ($(CROSS32_COMPILE),)
	ifdef CONFIG_PPC32
	# These options will be overridden by any -mcpu option that the CPU
	# or platform code sets later on the command line, but they are needed
	# to set a sane 32-bit cpu target for the 64-bit cross compiler which
	# may default to the wrong ISA.
	KBUILD_CFLAGS += -mcpu=powerpc
	KBUILD_AFLAGS += -mcpu=powerpc
	endif
	endif
	endif

	ifdef CONFIG_PPC_BOOK3S_32
	KBUILD_CFLAGS += -mcpu=powerpc
	endif

	# If we're on a ppc/ppc64/ppc64le machine use that defconfig, otherwise just use
	# ppc64_defconfig because we have nothing better to go on.
	uname := $(shell uname -m)
	KBUILD_DEFCONFIG := $(if $(filter ppc%,$(uname)),$(uname),ppc64)_defconfig

	ifdef CONFIG_PPC64
	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

	# BITS is used as extension for files which are available in a 32 bit
	# and a 64 bit version to simplify shared Makefiles.
	# e.g.: obj-y += foo_$(BITS).o
	export BITS

	ifdef CONFIG_PPC64
	BITS := 64
	else
	BITS := 32
	endif

	machine-y = ppc
	machine-$(CONFIG_PPC64) += 64
	machine-$(CONFIG_CPU_LITTLE_ENDIAN) += le
	UTS_MACHINE := $(subst $(space),,$(machine-y))

	# XXX This needs to be before we override LD below
	ifdef CONFIG_PPC32
	KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
	else
	KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/powerpc/kernel/module.lds
	ifeq ($(call ld-ifversion, -ge, 225000000, y),y)
	# Have the linker provide sfpr if possible.
	# There is a corresponding test in arch/powerpc/lib/Makefile
	KBUILD_LDFLAGS_MODULE += --save-restore-funcs
	else
	KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
	endif
	endif

	ifdef CONFIG_CPU_LITTLE_ENDIAN
	KBUILD_CFLAGS += -mlittle-endian
	KBUILD_LDFLAGS += -EL
	LDEMULATION := lppc
	GNUTARGET := powerpcle
	MULTIPLEWORD := -mno-multiple
	KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
	else
	KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
	KBUILD_LDFLAGS += -EB
	LDEMULATION := ppc
	GNUTARGET := powerpc
	MULTIPLEWORD := -mmultiple
	endif

	ifdef CONFIG_PPC64
	cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
	cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mcall-aixdesc)
	aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mabi=elfv1)
	aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mabi=elfv2
	endif

	ifndef CONFIG_CC_IS_CLANG
	cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mno-strict-align
	endif

	cflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
	cflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian
	aflags-$(CONFIG_CPU_BIG_ENDIAN) += $(call cc-option,-mbig-endian)
	aflags-$(CONFIG_CPU_LITTLE_ENDIAN) += -mlittle-endian

	ifeq ($(HAS_BIARCH),y)
	KBUILD_CFLAGS += -m$(BITS)
	KBUILD_AFLAGS += -m$(BITS) -Wl,-a$(BITS)
	KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
	KBUILD_ARFLAGS += --target=elf$(BITS)-$(GNUTARGET)
	endif

	cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls
	ifdef CONFIG_PPC64
	cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13
	else
	cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2
	endif

	LDFLAGS_vmlinux-y := -Bstatic
	LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie
	LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)
	LDFLAGS_vmlinux += $(call ld-option,--orphan-handling=warn)

	ifdef CONFIG_PPC64
	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) := $(call cc-option,-mtraceback=no)
	ifdef CONFIG_CPU_LITTLE_ENDIAN
	CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2,$(call cc-option,-mcall-aixdesc))
	AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv2)
	else
	CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
	CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcall-aixdesc)
	AFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mabi=elfv1)
	endif
	CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mcmodel=medium,$(call cc-option,-mminimal-toc))
	CFLAGS-$(CONFIG_PPC64) += $(call cc-option,-mno-pointers-to-nested-functions)

	# Clang unconditionally reserves r2 on ppc32 and does not support the flag
	# https://bugs.llvm.org/show_bug.cgi?id=39555
	CFLAGS-$(CONFIG_PPC32) := $(call cc-option, -ffixed-r2)

	# Clang doesn't support -mmultiple / -mno-multiple
	# https://bugs.llvm.org/show_bug.cgi?id=39556
	CFLAGS-$(CONFIG_PPC32) += $(call cc-option, $(MULTIPLEWORD))

	CFLAGS-$(CONFIG_PPC32) += $(call cc-option,-mno-readonly-in-sdata)

	ifdef CONFIG_PPC_BOOK3S_64
	ifdef CONFIG_CPU_LITTLE_ENDIAN
	CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=power8
	CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power9,-mtune=power8)
	else
	CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,$(call cc-option,-mtune=power5))
	CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mcpu=power5,-mcpu=power4)
	endif
	else
	CFLAGS-$(CONFIG_GENERIC_CPU) += -mcpu=powerpc64
	endif

	ifdef CONFIG_FUNCTION_TRACER
	CC_FLAGS_FTRACE := -pg
	ifdef CONFIG_MPROFILE_KERNEL
	CC_FLAGS_FTRACE += -mprofile-kernel
	endif
	# Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
	# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
	ifndef CONFIG_CC_IS_CLANG
	CC_FLAGS_FTRACE += $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
	endif
	endif

	CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += $(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))

	# Altivec option not allowed with e500mc64 in GCC.
	ifdef CONFIG_ALTIVEC
	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))

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

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

	KBUILD_CPPFLAGS += -I $(srctree)/arch/$(ARCH) $(asinstr)
	KBUILD_AFLAGS += $(AFLAGS-y)
	KBUILD_CFLAGS += $(call cc-option,-msoft-float)
	KBUILD_CFLAGS += -pipe $(CFLAGS-y)
	CPP = $(CC) -E $(KBUILD_CFLAGS)

	CHECKFLAGS += -m$(BITS) -D__powerpc__ -D__powerpc$(BITS)__
	ifdef CONFIG_CPU_BIG_ENDIAN
	CHECKFLAGS += -D__BIG_ENDIAN__
	else
	CHECKFLAGS += -D__LITTLE_ENDIAN__
	endif

	ifdef CONFIG_476FPE_ERR46
	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)

	# 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 += $(call cc-option,-mno-string)

	cpu-as-$(CONFIG_4xx) += -Wa,-m405
	cpu-as-$(CONFIG_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)
	cpu-as-$(CONFIG_E200) += -Wa,-me200
	cpu-as-$(CONFIG_E500) += -Wa,-me500

	# When using '-many -mpower4' gas will first try and find a matching power4
	# mnemonic and failing that it will allow any valid mnemonic that GAS knows
	# about. GCC will pass -many to GAS when assembling, clang does not.
	cpu-as-$(CONFIG_PPC_BOOK3S_64) += -Wa,-mpower4 -Wa,-many
	cpu-as-$(CONFIG_PPC_E500MC) += $(call as-option,-Wa$(comma)-me500mc)

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

	KBUILD_AFLAGS += $(aflags-y)
	KBUILD_CFLAGS += $(cflags-y)

	head-y := arch/powerpc/kernel/head_$(BITS).o
	head-$(CONFIG_PPC_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

	# See arch/powerpc/Kbuild for content of core part of the kernel
	core-y += arch/powerpc/

	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

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


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

	# Used to create 'merged defconfigs'
	# To use it $(call) it with the first argument as the base defconfig
	# and the second argument as a space separated list of .config files to merge,
	# without the .config suffix.
	define merge_into_defconfig
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
	-m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/$(1) \
	$(foreach config,$(2),$(srctree)/arch/$(ARCH)/configs/$(config).config)
	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
	endef

	PHONY += pseries_le_defconfig
	pseries_le_defconfig:
	$(call merge_into_defconfig,pseries_defconfig,le)

	PHONY += ppc64le_defconfig
	ppc64le_defconfig:
	$(call merge_into_defconfig,ppc64_defconfig,le)

	PHONY += ppc64le_guest_defconfig
	ppc64le_guest_defconfig:
	$(call merge_into_defconfig,ppc64_defconfig,le guest)

	PHONY += ppc64_guest_defconfig
	ppc64_guest_defconfig:
	$(call merge_into_defconfig,ppc64_defconfig,be guest)

	PHONY += powernv_be_defconfig
	powernv_be_defconfig:
	$(call merge_into_defconfig,powernv_defconfig,be)

	PHONY += mpc85xx_defconfig
	mpc85xx_defconfig:
	$(call merge_into_defconfig,mpc85xx_basic_defconfig,\
	85xx-32bit 85xx-hw fsl-emb-nonhw)

	PHONY += mpc85xx_smp_defconfig
	mpc85xx_smp_defconfig:
	$(call merge_into_defconfig,mpc85xx_basic_defconfig,\
	85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)

	PHONY += corenet32_smp_defconfig
	corenet32_smp_defconfig:
	$(call merge_into_defconfig,corenet_basic_defconfig,\
	85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw dpaa)

	PHONY += corenet64_smp_defconfig
	corenet64_smp_defconfig:
	$(call merge_into_defconfig,corenet_basic_defconfig,\
	85xx-64bit 85xx-smp altivec 85xx-hw fsl-emb-nonhw dpaa)

	PHONY += mpc86xx_defconfig
	mpc86xx_defconfig:
	$(call merge_into_defconfig,mpc86xx_basic_defconfig,\
	86xx-hw fsl-emb-nonhw)

	PHONY += mpc86xx_smp_defconfig
	mpc86xx_smp_defconfig:
	$(call merge_into_defconfig,mpc86xx_basic_defconfig,\
	86xx-smp 86xx-hw fsl-emb-nonhw)

	PHONY += ppc32_allmodconfig
	ppc32_allmodconfig:
	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/book3s_32.config \
	-f $(srctree)/Makefile allmodconfig

	PHONY += ppc_defconfig
	ppc_defconfig:
	$(call merge_into_defconfig,book3s_32.config,)

	PHONY += ppc64le_allmodconfig
	ppc64le_allmodconfig:
	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/le.config \
	-f $(srctree)/Makefile allmodconfig

	PHONY += ppc64_book3e_allmodconfig
	ppc64_book3e_allmodconfig:
	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/85xx-64bit.config \
	-f $(srctree)/Makefile allmodconfig

	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:
	ifdef CONFIG_PPC64
	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso64 $@
	endif
	ifdef CONFIG_VDSO32
	$(Q)$(MAKE) $(build)=arch/$(ARCH)/kernel/vdso32 $@
	endif

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

	archprepare: checkbin

	archheaders:
	$(Q)$(MAKE) $(build)=arch/powerpc/kernel/syscalls all

	ifdef CONFIG_STACKPROTECTOR
	prepare: stack_protector_prepare

	stack_protector_prepare: prepare0
	ifdef CONFIG_PPC64
	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h))
	else
	$(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h))
	endif
	endif

	ifdef CONFIG_SMP
	prepare: task_cpu_prepare

	task_cpu_prepare: prepare0
	$(eval KBUILD_CFLAGS += -D_TASK_CPU=$(shell awk '{if ($$2 == "TASK_CPU") print $$3;}' include/generated/asm-offsets.h))
	endif

	# Check toolchain versions:
	# - gcc-4.6 is the minimum kernel-wide version so nothing required.
	checkbin:
	@if test "x${CONFIG_CPU_LITTLE_ENDIAN}" = "xy" \
	&& $(LD) --version \| head -1 \| grep ' 2\.24$$' >/dev/null ; then \
	echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
	echo 'in some circumstances.' ; \
	echo -n '*** Please use a different binutils version.' ; \
	false ; \
	fi