arch/arm64/Makefile - linux - Git at Google

 #
 # arch/arm64/Makefile
 #
 # 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) 1995-2001 by Russell King

 LDFLAGS_vmlinux	:=--no-undefined -X
 CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
 GZFLAGS		:=-9

 ifeq ($(CONFIG_RELOCATABLE), y)
 # Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
 # for relative relocs, since this leads to better Image compression
 # with the relocation offsets always being zero.
 LDFLAGS_vmlinux		+= -shared -Bsymbolic -z notext -z norelro \
 			$(call ld-option, --no-apply-dynamic-relocs)
 endif

 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
   ifeq ($(call ld-option, --fix-cortex-a53-843419),)
 $(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
   else
 LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
   endif
 endif

 # Check for binutils support for specific extensions
 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)

 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
   ifeq ($(lseinstr),)
 $(warning LSE atomics not supported by binutils)
   endif
 endif

 ifeq ($(CONFIG_ARM64), y)
 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)

   ifneq ($(brokengasinst),)
 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
   endif
 endif

 ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
   CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)

   ifeq ($(CONFIG_CC_IS_CLANG), y)
     $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
   else ifeq ($(strip $(CROSS_COMPILE_COMPAT)),)
     $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
   else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
     $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
   else
     export CROSS_COMPILE_COMPAT
     export CONFIG_COMPAT_VDSO := y
     compat_vdso := -DCONFIG_COMPAT_VDSO=1
   endif
 endif

 KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst) $(compat_vdso)
 KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
 KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
 KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst) $(compat_vdso)

 KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
 KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)

 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
 prepare: stack_protector_prepare
 stack_protector_prepare: prepare0
 	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
 				-mstack-protector-guard-reg=sp_el0	  \
 				-mstack-protector-guard-offset=$(shell	  \
 			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
 					include/generated/asm-offsets.h))
 endif

 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
 KBUILD_CPPFLAGS	+= -mbig-endian
 CHECKFLAGS	+= -D__AARCH64EB__
 AS		+= -EB
 # Prefer the baremetal ELF build target, but not all toolchains include
 # it so fall back to the standard linux version if needed.
 KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
 UTS_MACHINE	:= aarch64_be
 else
 KBUILD_CPPFLAGS	+= -mlittle-endian
 CHECKFLAGS	+= -D__AARCH64EL__
 AS		+= -EL
 # Same as above, prefer ELF but fall back to linux target if needed.
 KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
 UTS_MACHINE	:= aarch64
 endif

 CHECKFLAGS	+= -D__aarch64__

 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
 KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
 endif

 # Default value
 head-y		:= arch/arm64/kernel/head.o

 # The byte offset of the kernel image in RAM from the start of RAM.
 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
 		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
 		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
 else
 TEXT_OFFSET := 0x00080000
 endif

 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
 KASAN_SHADOW_SCALE_SHIFT := 4
 else
 KASAN_SHADOW_SCALE_SHIFT := 3
 endif

 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)

 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
 #				 - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
 # in 32-bit arithmetic
 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
 	(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
 	+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
 	- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )

 export	TEXT_OFFSET GZFLAGS

 core-y		+= arch/arm64/kernel/ arch/arm64/mm/
 core-$(CONFIG_NET) += arch/arm64/net/
 core-$(CONFIG_KVM) += arch/arm64/kvm/
 core-$(CONFIG_XEN) += arch/arm64/xen/
 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 libs-y		:= arch/arm64/lib/ $(libs-y)
 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

 # Default target when executing plain make
 boot		:= arch/arm64/boot
 KBUILD_IMAGE	:= $(boot)/Image.gz

 all:	Image.gz


 Image: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

 Image.%: Image
 	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

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

 PHONY += vdso_install
 vdso_install:
 	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@

 # We use MRPROPER_FILES and CLEAN_FILES now
 archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)

 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
 	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
 		$(build)=arch/arm64/kernel/vdso32  \
 		include/generated/vdso32-offsets.h)
 endif

 define archhelp
   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
   echo  '  install       - Install uncompressed kernel'
   echo  '  zinstall      - Install compressed kernel'
   echo  '                  Install using (your) ~/bin/installkernel or'
   echo  '                  (distribution) /sbin/installkernel or'
   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 endef
	#
	# arch/arm64/Makefile
	#
	# 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) 1995-2001 by Russell King

	LDFLAGS_vmlinux :=--no-undefined -X
	CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
	GZFLAGS :=-9

	ifeq ($(CONFIG_RELOCATABLE), y)
	# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
	# for relative relocs, since this leads to better Image compression
	# with the relocation offsets always being zero.
	LDFLAGS_vmlinux += -shared -Bsymbolic -z notext -z norelro \
	$(call ld-option, --no-apply-dynamic-relocs)
	endif

	ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
	ifeq ($(call ld-option, --fix-cortex-a53-843419),)
	$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
	else
	LDFLAGS_vmlinux += --fix-cortex-a53-843419
	endif
	endif

	# Check for binutils support for specific extensions
	lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)

	ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
	ifeq ($(lseinstr),)
	$(warning LSE atomics not supported by binutils)
	endif
	endif

	ifeq ($(CONFIG_ARM64), y)
	brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)

	ifneq ($(brokengasinst),)
	$(warning Detected assembler with broken .inst; disassembly will be unreliable)
	endif
	endif

	ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
	CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)

	ifeq ($(CONFIG_CC_IS_CLANG), y)
	$(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
	else ifeq ($(strip $(CROSS_COMPILE_COMPAT)),)
	$(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
	else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
	$(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
	else
	export CROSS_COMPILE_COMPAT
	export CONFIG_COMPAT_VDSO := y
	compat_vdso := -DCONFIG_COMPAT_VDSO=1
	endif
	endif

	KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) $(compat_vdso)
	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
	KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
	KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) $(compat_vdso)

	KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
	KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)

	ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
	prepare: stack_protector_prepare
	stack_protector_prepare: prepare0
	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \
	-mstack-protector-guard-reg=sp_el0 \
	-mstack-protector-guard-offset=$(shell \
	awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
	include/generated/asm-offsets.h))
	endif

	ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
	KBUILD_CPPFLAGS += -mbig-endian
	CHECKFLAGS += -D__AARCH64EB__
	AS += -EB
	# Prefer the baremetal ELF build target, but not all toolchains include
	# it so fall back to the standard linux version if needed.
	KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
	UTS_MACHINE := aarch64_be
	else
	KBUILD_CPPFLAGS += -mlittle-endian
	CHECKFLAGS += -D__AARCH64EL__
	AS += -EL
	# Same as above, prefer ELF but fall back to linux target if needed.
	KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux)
	UTS_MACHINE := aarch64
	endif

	CHECKFLAGS += -D__aarch64__

	ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
	KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds
	endif

	# Default value
	head-y := arch/arm64/kernel/head.o

	# The byte offset of the kernel image in RAM from the start of RAM.
	ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
	TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
	int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
	rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
	else
	TEXT_OFFSET := 0x00080000
	endif

	ifeq ($(CONFIG_KASAN_SW_TAGS), y)
	KASAN_SHADOW_SCALE_SHIFT := 4
	else
	KASAN_SHADOW_SCALE_SHIFT := 3
	endif

	KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
	KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
	KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)

	# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
	# - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
	# in 32-bit arithmetic
	KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
	(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
	+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
	- (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )

	export TEXT_OFFSET GZFLAGS

	core-y += arch/arm64/kernel/ arch/arm64/mm/
	core-$(CONFIG_NET) += arch/arm64/net/
	core-$(CONFIG_KVM) += arch/arm64/kvm/
	core-$(CONFIG_XEN) += arch/arm64/xen/
	core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
	libs-y := arch/arm64/lib/ $(libs-y)
	core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

	# Default target when executing plain make
	boot := arch/arm64/boot
	KBUILD_IMAGE := $(boot)/Image.gz

	all: Image.gz


	Image: vmlinux
	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

	Image.%: Image
	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

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

	PHONY += vdso_install
	vdso_install:
	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@

	# We use MRPROPER_FILES and CLEAN_FILES now
	archclean:
	$(Q)$(MAKE) $(clean)=$(boot)

	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
	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
	$(build)=arch/arm64/kernel/vdso32 \
	include/generated/vdso32-offsets.h)
	endif

	define archhelp
	echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
	echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
	echo ' install - Install uncompressed kernel'
	echo ' zinstall - Install compressed kernel'
	echo ' Install using (your) ~/bin/installkernel or'
	echo ' (distribution) /sbin/installkernel or'
	echo ' install to $$(INSTALL_PATH) and run lilo'
	endef