arch/powerpc/Makefile - linux - Git at Google

 # This file is included by the global makefile so that you can add your own
 # architecture-specific flags and dependencies.
 #
 # 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 ?=

 # 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

 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

 # 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
 ifeq ($(call ld-ifversion, -ge, 22500, 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
 ifndef CONFIG_CC_IS_CLANG
 cflags-$(CONFIG_PPC64_ELF_ABI_V1)	+= $(call cc-option,-mabi=elfv1)
 cflags-$(CONFIG_PPC64_ELF_ABI_V1)	+= $(call cc-option,-mcall-aixdesc)
 aflags-$(CONFIG_PPC64_ELF_ABI_V1)	+= $(call cc-option,-mabi=elfv1)
 aflags-$(CONFIG_PPC64_ELF_ABI_V2)	+= -mabi=elfv2
 endif
 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$(BITS)
 KBUILD_LDFLAGS	+= -m elf$(BITS)$(LDEMULATION)
 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-$(CONFIG_RELOCATABLE) := -pie
 LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
 LDFLAGS_vmlinux	:= $(LDFLAGS_vmlinux-y)

 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)	:= $(call cc-option,-mtraceback=no)
 ifndef CONFIG_CC_IS_CLANG
 ifdef CONFIG_PPC64_ELF_ABI_V2
 CFLAGS-$(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)	+= $(call cc-option,-mabi=elfv1)
 endif
 endif
 CFLAGS-$(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_FUNCTION_TRACER
 CC_FLAGS_FTRACE := -pg
 ifdef CONFIG_MPROFILE_KERNEL
 CC_FLAGS_FTRACE += -mprofile-kernel
 endif
 endif

 CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
 AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)

 CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10,	\
 				  $(call cc-option,-mtune=power9,	\
 				  $(call cc-option,-mtune=power8)))

 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 prefix or pcrel
 KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
 KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)

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

 # 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)

 # Don't emit .eh_frame since we have no use for it
 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

 # 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_ALTIVEC)	+= $(call as-option,-Wa$(comma)-maltivec)

 # 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.
 # LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
 # but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
 cpu-as-$(CONFIG_PPC_BOOK3S_64)	+= $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)

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

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

 # 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)/%,$@)


 PHONY += bootwrapper_install
 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_base.config,\
 		85xx-32bit 85xx-hw fsl-emb-nonhw)

 PHONY += mpc85xx_smp_defconfig
 mpc85xx_smp_defconfig:
 	$(call merge_into_defconfig,mpc85xx_base.config,\
 		85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)

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

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

 PHONY += mpc86xx_defconfig
 mpc86xx_defconfig:
 	$(call merge_into_defconfig,mpc86xx_base.config,\
 		86xx-hw fsl-emb-nonhw)

 PHONY += mpc86xx_smp_defconfig
 mpc86xx_smp_defconfig:
 	$(call merge_into_defconfig,mpc86xx_base.config,\
 		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 += ppc64le_allnoconfig
 ppc64le_allnoconfig:
 	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
 		-f $(srctree)/Makefile allnoconfig

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

 PHONY += ppc32_randconfig
 ppc32_randconfig:
 	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
 		-f $(srctree)/Makefile randconfig

 PHONY += ppc64_randconfig
 ppc64_randconfig:
 	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
 		-f $(srctree)/Makefile randconfig

 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

 PHONY += install
 install:
 	$(call cmd,install)

 ifeq ($(KBUILD_EXTMOD),)
 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 # In order to do that, we should use the archprepare target, but we can't since
 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 # Therefore we need to generate the header after prepare0 has been made, hence
 # this hack.
 prepare: vdso_prepare
 vdso_prepare: prepare0
 	$(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
 		$(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
 	$(if $(CONFIG_PPC64),$(Q)$(MAKE) \
 		$(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
 endif

 archprepare: checkbin

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

 ifdef CONFIG_STACKPROTECTOR
 prepare: stack_protector_prepare

 PHONY += 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

 PHONY += checkbin
 # Check toolchain versions:
 # - gcc-4.6 is the minimum kernel-wide version so nothing required.
 checkbin:
 	@if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
 		"x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
 		echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
 		echo 'in some circumstances.' ; \
 		echo    '*** binutils 2.23 do not define the TOC symbol ' ; \
 		echo -n '*** Please use a different binutils version.' ; \
 		false ; \
 	fi
 	@if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
 		"x${CONFIG_LD_IS_BFD}" = "xy" -a \
 		"${CONFIG_LD_VERSION}" = "23700" ; then \
 		echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
 		echo 'is unable to handle.' ; \
 		echo '*** 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.
	#
	# 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 ?=

	# 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

	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

	# 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
	ifeq ($(call ld-ifversion, -ge, 22500, 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
	ifndef CONFIG_CC_IS_CLANG
	cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
	cflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mcall-aixdesc)
	aflags-$(CONFIG_PPC64_ELF_ABI_V1) += $(call cc-option,-mabi=elfv1)
	aflags-$(CONFIG_PPC64_ELF_ABI_V2) += -mabi=elfv2
	endif
	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$(BITS)
	KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION)
	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-$(CONFIG_RELOCATABLE) := -pie
	LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext
	LDFLAGS_vmlinux := $(LDFLAGS_vmlinux-y)

	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) := $(call cc-option,-mtraceback=no)
	ifndef CONFIG_CC_IS_CLANG
	ifdef CONFIG_PPC64_ELF_ABI_V2
	CFLAGS-$(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) += $(call cc-option,-mabi=elfv1)
	endif
	endif
	CFLAGS-$(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_FUNCTION_TRACER
	CC_FLAGS_FTRACE := -pg
	ifdef CONFIG_MPROFILE_KERNEL
	CC_FLAGS_FTRACE += -mprofile-kernel
	endif
	endif

	CFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)
	AFLAGS-$(CONFIG_TARGET_CPU_BOOL) += -mcpu=$(CONFIG_TARGET_CPU)

	CFLAGS-$(CONFIG_POWERPC64_CPU) += $(call cc-option,-mtune=power10, \
	$(call cc-option,-mtune=power9, \
	$(call cc-option,-mtune=power8)))

	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 prefix or pcrel
	KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
	KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)

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

	# 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)

	# Don't emit .eh_frame since we have no use for it
	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables

	# 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_ALTIVEC) += $(call as-option,-Wa$(comma)-maltivec)

	# 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.
	# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675
	# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway...
	cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many)

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

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

	# 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)/%,$@)


	PHONY += bootwrapper_install
	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_base.config,\
	85xx-32bit 85xx-hw fsl-emb-nonhw)

	PHONY += mpc85xx_smp_defconfig
	mpc85xx_smp_defconfig:
	$(call merge_into_defconfig,mpc85xx_base.config,\
	85xx-32bit 85xx-smp 85xx-hw fsl-emb-nonhw)

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

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

	PHONY += mpc86xx_defconfig
	mpc86xx_defconfig:
	$(call merge_into_defconfig,mpc86xx_base.config,\
	86xx-hw fsl-emb-nonhw)

	PHONY += mpc86xx_smp_defconfig
	mpc86xx_smp_defconfig:
	$(call merge_into_defconfig,mpc86xx_base.config,\
	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 += ppc64le_allnoconfig
	ppc64le_allnoconfig:
	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/ppc64le.config \
	-f $(srctree)/Makefile allnoconfig

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

	PHONY += ppc32_randconfig
	ppc32_randconfig:
	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/32-bit.config \
	-f $(srctree)/Makefile randconfig

	PHONY += ppc64_randconfig
	ppc64_randconfig:
	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
	-f $(srctree)/Makefile randconfig

	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

	PHONY += install
	install:
	$(call cmd,install)

	ifeq ($(KBUILD_EXTMOD),)
	# We need to generate vdso-offsets.h before compiling certain files in kernel/.
	# In order to do that, we should use the archprepare target, but we can't since
	# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
	# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
	# Therefore we need to generate the header after prepare0 has been made, hence
	# this hack.
	prepare: vdso_prepare
	vdso_prepare: prepare0
	$(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
	$(build)=arch/powerpc/kernel/vdso include/generated/vdso32-offsets.h)
	$(if $(CONFIG_PPC64),$(Q)$(MAKE) \
	$(build)=arch/powerpc/kernel/vdso include/generated/vdso64-offsets.h)
	endif

	archprepare: checkbin

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

	ifdef CONFIG_STACKPROTECTOR
	prepare: stack_protector_prepare

	PHONY += 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

	PHONY += checkbin
	# Check toolchain versions:
	# - gcc-4.6 is the minimum kernel-wide version so nothing required.
	checkbin:
	@if test "x${CONFIG_LD_IS_LLD}" != "xy" -a \
	"x$(call ld-ifversion, -le, 22400, y)" = "xy" ; then \
	echo -n '*** binutils 2.24 miscompiles weak symbols ' ; \
	echo 'in some circumstances.' ; \
	echo '*** binutils 2.23 do not define the TOC symbol ' ; \
	echo -n '*** Please use a different binutils version.' ; \
	false ; \
	fi
	@if test "x${CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT}" = "xy" -a \
	"x${CONFIG_LD_IS_BFD}" = "xy" -a \
	"${CONFIG_LD_VERSION}" = "23700" ; then \
	echo -n '*** binutils 2.37 drops unused section symbols, which recordmcount ' ; \
	echo 'is unable to handle.' ; \
	echo '*** Please use a different binutils version.' ; \
	false ; \
	fi