arch/x86/Makefile - maze/linux - Git at Google

 # Unified Makefile for i386 and x86_64

 # select defconfig based on actual architecture
 ifeq ($(ARCH),x86)
         KBUILD_DEFCONFIG := i386_defconfig
 else
         KBUILD_DEFCONFIG := $(ARCH)_defconfig
 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

 ifeq ($(CONFIG_X86_32),y)
         BITS := 32
         UTS_MACHINE := i386
         CHECKFLAGS += -D__i386__

         biarch := $(call cc-option,-m32)
         KBUILD_AFLAGS += $(biarch)
         KBUILD_CFLAGS += $(biarch)

         ifdef CONFIG_RELOCATABLE
                 LDFLAGS_vmlinux := --emit-relocs
         endif

         KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return

         # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
         # with nonstandard options
         KBUILD_CFLAGS += -fno-pic

         # prevent gcc from keeping the stack 16 byte aligned
         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)

         # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
         # a lot more stack due to the lack of sharing of stacklots:
         KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
 				$(call cc-option,-fno-unit-at-a-time))

         # CPU-specific tuning. Anything which can be shared with UML should go here.
         include $(srctree)/arch/x86/Makefile_32.cpu
         KBUILD_CFLAGS += $(cflags-y)

         # temporary until string.h is fixed
         KBUILD_CFLAGS += -ffreestanding
 else
         BITS := 64
         UTS_MACHINE := x86_64
         CHECKFLAGS += -D__x86_64__ -m64

         KBUILD_AFLAGS += -m64
         KBUILD_CFLAGS += -m64

 	# Use -mpreferred-stack-boundary=3 if supported.
 	KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3)

         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)

         cflags-$(CONFIG_MCORE2) += \
                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
 	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
 		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
         cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
         KBUILD_CFLAGS += $(cflags-y)

         KBUILD_CFLAGS += -mno-red-zone
         KBUILD_CFLAGS += -mcmodel=kernel

         # -funit-at-a-time shrinks the kernel .text considerably
         # unfortunately it makes reading oopses harder.
         KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)

         # this works around some issues with generating unwind tables in older gccs
         # newer gccs do it by default
         KBUILD_CFLAGS += -maccumulate-outgoing-args
 endif

 ifdef CONFIG_CC_STACKPROTECTOR
 	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
         ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
                 stackp-y := -fstack-protector
                 KBUILD_CFLAGS += $(stackp-y)
         else
                 $(warning stack protector enabled but no compiler support)
         endif
 endif

 ifdef CONFIG_X86_X32
 	x32_ld_ok := $(call try-run,\
 			/bin/echo -e '1: .quad 1b' | \
 			$(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \
 			$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
 			$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
         ifeq ($(x32_ld_ok),y)
                 CONFIG_X86_X32_ABI := y
                 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
                 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
         else
                 $(warning CONFIG_X86_X32 enabled but no binutils support)
         endif
 endif
 export CONFIG_X86_X32_ABI

 # Don't unroll struct assignments with kmemcheck enabled
 ifeq ($(CONFIG_KMEMCHECK),y)
 	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
 endif

 # Stackpointer is addressed different for 32 bit and 64 bit x86
 sp-$(CONFIG_X86_32) := esp
 sp-$(CONFIG_X86_64) := rsp

 # do binutils support CFI?
 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
 # is .cfi_signal_frame supported too?
 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)

 # does binutils support specific instructions?
 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)

 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)

 LDFLAGS := -m elf_$(UTS_MACHINE)

 # Speed up the build
 KBUILD_CFLAGS += -pipe
 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 KBUILD_CFLAGS += -Wno-sign-compare
 #
 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 # prevent gcc from generating any FP code by mistake
 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)

 KBUILD_CFLAGS += $(mflags-y)
 KBUILD_AFLAGS += $(mflags-y)

 archscripts:
 	$(Q)$(MAKE) $(build)=arch/x86/tools relocs

 ###
 # Syscall table generation

 archheaders:
 	$(Q)$(MAKE) $(build)=arch/x86/syscalls all

 ###
 # Kernel objects

 head-y := arch/x86/kernel/head_$(BITS).o
 head-y += arch/x86/kernel/head$(BITS).o
 head-y += arch/x86/kernel/head.o

 libs-y  += arch/x86/lib/

 # See arch/x86/Kbuild for content of core part of the kernel
 core-y += arch/x86/

 # drivers-y are linked after core-y
 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 drivers-$(CONFIG_PCI)            += arch/x86/pci/

 # must be linked after kernel/
 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/

 # suspend and hibernation support
 drivers-$(CONFIG_PM) += arch/x86/power/

 drivers-$(CONFIG_FB) += arch/x86/video/

 ####
 # boot loader support. Several targets are kept for legacy purposes

 boot := arch/x86/boot

 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage

 PHONY += bzImage $(BOOT_TARGETS)

 # Default kernel to build
 all: bzImage

 # KBUILD_IMAGE specify target image being built
 KBUILD_IMAGE := $(boot)/bzImage

 bzImage: vmlinux
 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
 endif
 	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@

 $(BOOT_TARGETS): vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $@

 PHONY += install
 install:
 	$(Q)$(MAKE) $(build)=$(boot) $@

 PHONY += vdso_install
 vdso_install:
 	$(Q)$(MAKE) $(build)=arch/x86/vdso $@

 archclean:
 	$(Q)rm -rf $(objtree)/arch/i386
 	$(Q)rm -rf $(objtree)/arch/x86_64
 	$(Q)$(MAKE) $(clean)=$(boot)
 	$(Q)$(MAKE) $(clean)=arch/x86/tools

 define archhelp
   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
   echo  '  install      - Install kernel using'
   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
   echo  '                  install to $$(INSTALL_PATH) and run lilo'
   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
   echo  '                  bzdisk/fdimage*/isoimage also accept:'
   echo  '                  FDARGS="..."  arguments for the booted kernel'
   echo  '                  FDINITRD=file initrd for the booted kernel'
 endef
	# Unified Makefile for i386 and x86_64

	# select defconfig based on actual architecture
	ifeq ($(ARCH),x86)
	KBUILD_DEFCONFIG := i386_defconfig
	else
	KBUILD_DEFCONFIG := $(ARCH)_defconfig
	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

	ifeq ($(CONFIG_X86_32),y)
	BITS := 32
	UTS_MACHINE := i386
	CHECKFLAGS += -D__i386__

	biarch := $(call cc-option,-m32)
	KBUILD_AFLAGS += $(biarch)
	KBUILD_CFLAGS += $(biarch)

	ifdef CONFIG_RELOCATABLE
	LDFLAGS_vmlinux := --emit-relocs
	endif

	KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return

	# Never want PIC in a 32-bit kernel, prevent breakage with GCC built
	# with nonstandard options
	KBUILD_CFLAGS += -fno-pic

	# prevent gcc from keeping the stack 16 byte aligned
	KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)

	# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
	# a lot more stack due to the lack of sharing of stacklots:
	KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
	$(call cc-option,-fno-unit-at-a-time))

	# CPU-specific tuning. Anything which can be shared with UML should go here.
	include $(srctree)/arch/x86/Makefile_32.cpu
	KBUILD_CFLAGS += $(cflags-y)

	# temporary until string.h is fixed
	KBUILD_CFLAGS += -ffreestanding
	else
	BITS := 64
	UTS_MACHINE := x86_64
	CHECKFLAGS += -D__x86_64__ -m64

	KBUILD_AFLAGS += -m64
	KBUILD_CFLAGS += -m64

	# Use -mpreferred-stack-boundary=3 if supported.
	KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3)

	# FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
	cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
	cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)

	cflags-$(CONFIG_MCORE2) += \
	$(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
	$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
	cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
	KBUILD_CFLAGS += $(cflags-y)

	KBUILD_CFLAGS += -mno-red-zone
	KBUILD_CFLAGS += -mcmodel=kernel

	# -funit-at-a-time shrinks the kernel .text considerably
	# unfortunately it makes reading oopses harder.
	KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)

	# this works around some issues with generating unwind tables in older gccs
	# newer gccs do it by default
	KBUILD_CFLAGS += -maccumulate-outgoing-args
	endif

	ifdef CONFIG_CC_STACKPROTECTOR
	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
	ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
	stackp-y := -fstack-protector
	KBUILD_CFLAGS += $(stackp-y)
	else
	$(warning stack protector enabled but no compiler support)
	endif
	endif

	ifdef CONFIG_X86_X32
	x32_ld_ok := $(call try-run,\
	/bin/echo -e '1: .quad 1b' \| \
	$(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \
	$(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
	$(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
	ifeq ($(x32_ld_ok),y)
	CONFIG_X86_X32_ABI := y
	KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
	KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
	else
	$(warning CONFIG_X86_X32 enabled but no binutils support)
	endif
	endif
	export CONFIG_X86_X32_ABI

	# Don't unroll struct assignments with kmemcheck enabled
	ifeq ($(CONFIG_KMEMCHECK),y)
	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
	endif

	# Stackpointer is addressed different for 32 bit and 64 bit x86
	sp-$(CONFIG_X86_32) := esp
	sp-$(CONFIG_X86_64) := rsp

	# do binutils support CFI?
	cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
	# is .cfi_signal_frame supported too?
	cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
	cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)

	# does binutils support specific instructions?
	asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
	avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)

	KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
	KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)

	LDFLAGS := -m elf_$(UTS_MACHINE)

	# Speed up the build
	KBUILD_CFLAGS += -pipe
	# Workaround for a gcc prelease that unfortunately was shipped in a suse release
	KBUILD_CFLAGS += -Wno-sign-compare
	#
	KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
	# prevent gcc from generating any FP code by mistake
	KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
	KBUILD_CFLAGS += $(call cc-option,-mno-avx,)

	KBUILD_CFLAGS += $(mflags-y)
	KBUILD_AFLAGS += $(mflags-y)

	archscripts:
	$(Q)$(MAKE) $(build)=arch/x86/tools relocs

	###
	# Syscall table generation

	archheaders:
	$(Q)$(MAKE) $(build)=arch/x86/syscalls all

	###
	# Kernel objects

	head-y := arch/x86/kernel/head_$(BITS).o
	head-y += arch/x86/kernel/head$(BITS).o
	head-y += arch/x86/kernel/head.o

	libs-y += arch/x86/lib/

	# See arch/x86/Kbuild for content of core part of the kernel
	core-y += arch/x86/

	# drivers-y are linked after core-y
	drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
	drivers-$(CONFIG_PCI) += arch/x86/pci/

	# must be linked after kernel/
	drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/

	# suspend and hibernation support
	drivers-$(CONFIG_PM) += arch/x86/power/

	drivers-$(CONFIG_FB) += arch/x86/video/

	####
	# boot loader support. Several targets are kept for legacy purposes

	boot := arch/x86/boot

	BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage

	PHONY += bzImage $(BOOT_TARGETS)

	# Default kernel to build
	all: bzImage

	# KBUILD_IMAGE specify target image being built
	KBUILD_IMAGE := $(boot)/bzImage

	bzImage: vmlinux
	ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
	endif
	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@

	$(BOOT_TARGETS): vmlinux
	$(Q)$(MAKE) $(build)=$(boot) $@

	PHONY += install
	install:
	$(Q)$(MAKE) $(build)=$(boot) $@

	PHONY += vdso_install
	vdso_install:
	$(Q)$(MAKE) $(build)=arch/x86/vdso $@

	archclean:
	$(Q)rm -rf $(objtree)/arch/i386
	$(Q)rm -rf $(objtree)/arch/x86_64
	$(Q)$(MAKE) $(clean)=$(boot)
	$(Q)$(MAKE) $(clean)=arch/x86/tools

	define archhelp
	echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
	echo ' install - Install kernel using'
	echo ' (your) ~/bin/$(INSTALLKERNEL) or'
	echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
	echo ' install to $$(INSTALL_PATH) and run lilo'
	echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
	echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
	echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
	echo ' bzdisk/fdimage*/isoimage also accept:'
	echo ' FDARGS="..." arguments for the booted kernel'
	echo ' FDINITRD=file initrd for the booted kernel'
	endef