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 += $(call cc-ifversion, -lt, 0400, \ 36 $(call cc-option,-fno-unit-at-a-time)) 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_MATOM) += $(call cc-option,-march=atom) \ 59 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 60 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 61 KBUILD_CFLAGS += $(cflags-y) 62 63 KBUILD_CFLAGS += -mno-red-zone 64 KBUILD_CFLAGS += -mcmodel=kernel 65 66 # -funit-at-a-time shrinks the kernel .text considerably 67 # unfortunately it makes reading oopses harder. 68 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 69 70 # this works around some issues with generating unwind tables in older gccs 71 # newer gccs do it by default 72 KBUILD_CFLAGS += -maccumulate-outgoing-args 73endif 74 75KBUILD_CFLAGS += -fno-pic 76 77ifdef CONFIG_CC_STACKPROTECTOR 78 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 79 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 80 stackp-y := -fstack-protector 81 KBUILD_CFLAGS += $(stackp-y) 82 else 83 $(warning stack protector enabled but no compiler support) 84 endif 85endif 86 87ifdef CONFIG_X86_X32 88 x32_ld_ok := $(call try-run,\ 89 /bin/echo -e '1: .quad 1b' | \ 90 $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ 91 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ 92 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) 93 ifeq ($(x32_ld_ok),y) 94 CONFIG_X86_X32_ABI := y 95 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI 96 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI 97 else 98 $(warning CONFIG_X86_X32 enabled but no binutils support) 99 endif 100endif 101export CONFIG_X86_X32_ABI 102 103# Don't unroll struct assignments with kmemcheck enabled 104ifeq ($(CONFIG_KMEMCHECK),y) 105 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) 106endif 107 108# Stackpointer is addressed different for 32 bit and 64 bit x86 109sp-$(CONFIG_X86_32) := esp 110sp-$(CONFIG_X86_64) := rsp 111 112# do binutils support CFI? 113cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 114# is .cfi_signal_frame supported too? 115cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 116cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) 117 118# does binutils support specific instructions? 119asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1) 120 121KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) 122KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) 123 124LDFLAGS := -m elf_$(UTS_MACHINE) 125 126# Speed up the build 127KBUILD_CFLAGS += -pipe 128# Workaround for a gcc prelease that unfortunately was shipped in a suse release 129KBUILD_CFLAGS += -Wno-sign-compare 130# 131KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 132# prevent gcc from generating any FP code by mistake 133KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow 134KBUILD_CFLAGS += $(call cc-option,-mno-avx,) 135 136### 137# Sub architecture support 138# fcore-y is linked before mcore-y files. 139 140# Default subarch .c files 141mcore-y := arch/x86/mach-default/ 142 143# Voyager subarch support 144mflags-$(CONFIG_X86_VOYAGER) := -Iarch/x86/include/asm/mach-voyager 145mcore-$(CONFIG_X86_VOYAGER) := arch/x86/mach-voyager/ 146 147# generic subarchitecture 148mflags-$(CONFIG_X86_GENERICARCH):= -Iarch/x86/include/asm/mach-generic 149fcore-$(CONFIG_X86_GENERICARCH) += arch/x86/mach-generic/ 150mcore-$(CONFIG_X86_GENERICARCH) := arch/x86/mach-default/ 151 152# Goldfish virtual platform support 153mflags-$(CONFIG_X86_GOLDFISH):= -Iarch/x86/include/asm/mach-goldfish 154fcore-$(CONFIG_X86_GOLDFISH) += arch/x86/mach-goldfish/ 155mcore-$(CONFIG_X86_GOLDFISH) := arch/x86/mach-default/ 156 157# default subarch .h files 158mflags-y += -Iarch/x86/include/asm/mach-default 159 160# 64 bit does not support subarch support - clear sub arch variables 161fcore-$(CONFIG_X86_64) := 162mcore-$(CONFIG_X86_64) := 163 164KBUILD_CFLAGS += $(mflags-y) 165KBUILD_AFLAGS += $(mflags-y) 166 167archscripts: 168 $(Q)$(MAKE) $(build)=arch/x86/tools relocs 169 170### 171# Syscall table generation 172 173archheaders: 174 $(Q)$(MAKE) $(build)=arch/x86/syscalls all 175 176### 177# Kernel objects 178 179head-y := arch/x86/kernel/head_$(BITS).o 180head-y += arch/x86/kernel/head$(BITS).o 181head-y += arch/x86/kernel/head.o 182head-y += arch/x86/kernel/init_task.o 183 184libs-y += arch/x86/lib/ 185 186# See arch/x86/Kbuild for content of core part of the kernel 187core-y += arch/x86/ 188 189# drivers-y are linked after core-y 190drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 191drivers-$(CONFIG_PCI) += arch/x86/pci/ 192 193# must be linked after kernel/ 194drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 195 196# suspend and hibernation support 197drivers-$(CONFIG_PM) += arch/x86/power/ 198 199drivers-$(CONFIG_FB) += arch/x86/video/ 200 201#### 202# boot loader support. Several targets are kept for legacy purposes 203 204boot := arch/x86/boot 205 206BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 207 208PHONY += bzImage $(BOOT_TARGETS) 209 210# Default kernel to build 211all: bzImage 212 213# KBUILD_IMAGE specify target image being built 214KBUILD_IMAGE := $(boot)/bzImage 215 216bzImage: vmlinux 217ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) 218 $(Q)$(MAKE) $(build)=arch/x86/tools posttest 219endif 220 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 221 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 222 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 223 224$(BOOT_TARGETS): vmlinux 225 $(Q)$(MAKE) $(build)=$(boot) $@ 226 227PHONY += install 228install: 229 $(Q)$(MAKE) $(build)=$(boot) $@ 230 231PHONY += vdso_install 232vdso_install: 233 $(Q)$(MAKE) $(build)=arch/x86/vdso $@ 234 235archclean: 236 $(Q)rm -rf $(objtree)/arch/i386 237 $(Q)rm -rf $(objtree)/arch/x86_64 238 $(Q)$(MAKE) $(clean)=$(boot) 239 $(Q)$(MAKE) $(clean)=arch/x86/tools 240 241define archhelp 242 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 243 echo ' install - Install kernel using' 244 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 245 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 246 echo ' install to $$(INSTALL_PATH) and run lilo' 247 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 248 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 249 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 250 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 251 echo ' bzdisk/fdimage*/isoimage also accept:' 252 echo ' FDARGS="..." arguments for the booted kernel' 253 echo ' FDINITRD=file initrd for the booted kernel' 254endef 255