1# Unified Makefile for i386 and x86_64 2 3# select defconfig based on actual architecture 4ifeq ($(ARCH),x86) 5 KBUILD_DEFCONFIG := i386_defconfig 6else 7 KBUILD_DEFCONFIG := $(ARCH)_defconfig 8endif 9 10# BITS is used as extension for files which are available in a 32 bit 11# and a 64 bit version to simplify shared Makefiles. 12# e.g.: obj-y += foo_$(BITS).o 13export BITS 14 15ifeq ($(CONFIG_X86_32),y) 16 BITS := 32 17 UTS_MACHINE := i386 18 CHECKFLAGS += -D__i386__ 19 20 biarch := $(call cc-option,-m32) 21 KBUILD_AFLAGS += $(biarch) 22 KBUILD_CFLAGS += $(biarch) 23 24 ifdef CONFIG_RELOCATABLE 25 LDFLAGS_vmlinux := --emit-relocs 26 endif 27 28 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return 29 30 # prevent gcc from keeping the stack 16 byte aligned 31 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) 32 33 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use 34 # a lot more stack due to the lack of sharing of stacklots: 35 KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \ 36 echo $(call cc-option,-fno-unit-at-a-time); fi ;) 37 38 # CPU-specific tuning. Anything which can be shared with UML should go here. 39 include $(srctree)/arch/x86/Makefile_32.cpu 40 KBUILD_CFLAGS += $(cflags-y) 41 42 # temporary until string.h is fixed 43 KBUILD_CFLAGS += -ffreestanding 44else 45 BITS := 64 46 UTS_MACHINE := x86_64 47 CHECKFLAGS += -D__x86_64__ -m64 48 49 KBUILD_AFLAGS += -m64 50 KBUILD_CFLAGS += -m64 51 52 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) 53 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) 54 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) 55 56 cflags-$(CONFIG_MCORE2) += \ 57 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) 58 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 59 KBUILD_CFLAGS += $(cflags-y) 60 61 KBUILD_CFLAGS += -mno-red-zone 62 KBUILD_CFLAGS += -mcmodel=kernel 63 64 # -funit-at-a-time shrinks the kernel .text considerably 65 # unfortunately it makes reading oopses harder. 66 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 67 68 # this works around some issues with generating unwind tables in older gccs 69 # newer gccs do it by default 70 KBUILD_CFLAGS += -maccumulate-outgoing-args 71endif 72 73ifdef CONFIG_CC_STACKPROTECTOR 74 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 75 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC)),y) 76 stackp-y := -fstack-protector 77 stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all 78 KBUILD_CFLAGS += $(stackp-y) 79 else 80 $(warning stack protector enabled but no compiler support) 81 endif 82endif 83 84# Stackpointer is addressed different for 32 bit and 64 bit x86 85sp-$(CONFIG_X86_32) := esp 86sp-$(CONFIG_X86_64) := rsp 87 88# do binutils support CFI? 89cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 90# is .cfi_signal_frame supported too? 91cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 92KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) 93KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) 94 95LDFLAGS := -m elf_$(UTS_MACHINE) 96 97# Speed up the build 98KBUILD_CFLAGS += -pipe 99# Workaround for a gcc prelease that unfortunately was shipped in a suse release 100KBUILD_CFLAGS += -Wno-sign-compare 101# 102KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 103# prevent gcc from generating any FP code by mistake 104KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,) 105 106KBUILD_CFLAGS += $(mflags-y) 107KBUILD_AFLAGS += $(mflags-y) 108 109### 110# Kernel objects 111 112head-y := arch/x86/kernel/head_$(BITS).o 113head-y += arch/x86/kernel/head$(BITS).o 114head-y += arch/x86/kernel/head.o 115head-y += arch/x86/kernel/init_task.o 116 117libs-y += arch/x86/lib/ 118 119# See arch/x86/Kbuild for content of core part of the kernel 120core-y += arch/x86/ 121 122# drivers-y are linked after core-y 123drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 124drivers-$(CONFIG_PCI) += arch/x86/pci/ 125 126# must be linked after kernel/ 127drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 128 129# suspend and hibernation support 130drivers-$(CONFIG_PM) += arch/x86/power/ 131 132ifeq ($(CONFIG_X86_32),y) 133drivers-$(CONFIG_FB) += arch/x86/video/ 134endif 135 136#### 137# boot loader support. Several targets are kept for legacy purposes 138 139boot := arch/x86/boot 140 141BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 142 143PHONY += bzImage $(BOOT_TARGETS) 144 145# Default kernel to build 146all: bzImage 147 148# KBUILD_IMAGE specify target image being built 149KBUILD_IMAGE := $(boot)/bzImage 150 151bzImage: vmlinux 152 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 153 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 154 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 155 156$(BOOT_TARGETS): vmlinux 157 $(Q)$(MAKE) $(build)=$(boot) $@ 158 159PHONY += install 160install: 161 $(Q)$(MAKE) $(build)=$(boot) $@ 162 163PHONY += vdso_install 164vdso_install: 165 $(Q)$(MAKE) $(build)=arch/x86/vdso $@ 166 167archclean: 168 $(Q)rm -rf $(objtree)/arch/i386 169 $(Q)rm -rf $(objtree)/arch/x86_64 170 $(Q)$(MAKE) $(clean)=$(boot) 171 172define archhelp 173 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 174 echo ' install - Install kernel using' 175 echo ' (your) ~/bin/installkernel or' 176 echo ' (distribution) /sbin/installkernel or' 177 echo ' install to $$(INSTALL_PATH) and run lilo' 178 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 179 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 180 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 181 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 182 echo ' bzdisk/fdimage*/isoimage also accept:' 183 echo ' FDARGS="..." arguments for the booted kernel' 184 echo ' FDINITRD=file initrd for the booted kernel' 185endef 186