linux-imx/arch/x86/Makefile

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 -x assembler -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$(comma)%ymm2,-DCONFIG_AS_AVX=1) avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)

KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_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: scripts_basic $(Q)$(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