1# Unified Makefile for i386 and x86_64 2 3# select defconfig based on actual architecture 4ifeq ($(ARCH),x86) 5 ifeq ($(shell uname -m),x86_64) 6 KBUILD_DEFCONFIG := x86_64_defconfig 7 else 8 KBUILD_DEFCONFIG := i386_defconfig 9 endif 10else 11 KBUILD_DEFCONFIG := $(ARCH)_defconfig 12endif 13 14# BITS is used as extension for files which are available in a 32 bit 15# and a 64 bit version to simplify shared Makefiles. 16# e.g.: obj-y += foo_$(BITS).o 17export BITS 18 19ifeq ($(CONFIG_X86_32),y) 20 BITS := 32 21 UTS_MACHINE := i386 22 CHECKFLAGS += -D__i386__ 23 24 biarch := $(call cc-option,-m32) 25 KBUILD_AFLAGS += $(biarch) 26 KBUILD_CFLAGS += $(biarch) 27 28 ifdef CONFIG_RELOCATABLE 29 LDFLAGS_vmlinux := --emit-relocs 30 endif 31 32 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return 33 34 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built 35 # with nonstandard options 36 KBUILD_CFLAGS += -fno-pic 37 38 # prevent gcc from keeping the stack 16 byte aligned 39 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) 40 41 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use 42 # a lot more stack due to the lack of sharing of stacklots: 43 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \ 44 $(call cc-option,-fno-unit-at-a-time)) 45 46 # CPU-specific tuning. Anything which can be shared with UML should go here. 47 include $(srctree)/arch/x86/Makefile_32.cpu 48 KBUILD_CFLAGS += $(cflags-y) 49 50 # temporary until string.h is fixed 51 KBUILD_CFLAGS += -ffreestanding 52else 53 BITS := 64 54 UTS_MACHINE := x86_64 55 CHECKFLAGS += -D__x86_64__ -m64 56 57 KBUILD_AFLAGS += -m64 58 KBUILD_CFLAGS += -m64 59 60 # Use -mpreferred-stack-boundary=3 if supported. 61 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3) 62 63 KBUILD_CFLAGS += -fno-pic 64 65 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) 66 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) 67 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) 68 69 cflags-$(CONFIG_MCORE2) += \ 70 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) 71 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ 72 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 73 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 74 KBUILD_CFLAGS += $(cflags-y) 75 76 KBUILD_CFLAGS += -mno-red-zone 77 KBUILD_CFLAGS += -mcmodel=kernel 78 79 # -funit-at-a-time shrinks the kernel .text considerably 80 # unfortunately it makes reading oopses harder. 81 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 82 83 # this works around some issues with generating unwind tables in older gccs 84 # newer gccs do it by default 85 KBUILD_CFLAGS += -maccumulate-outgoing-args 86endif 87 88ifdef CONFIG_CC_STACKPROTECTOR 89 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 90 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 91 stackp-y := -fstack-protector 92 KBUILD_CFLAGS += $(stackp-y) 93 else 94 $(warning stack protector enabled but no compiler support) 95 endif 96endif 97 98ifdef CONFIG_X86_X32 99 x32_ld_ok := $(call try-run,\ 100 /bin/echo -e '1: .quad 1b' | \ 101 $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ 102 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ 103 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) 104 ifeq ($(x32_ld_ok),y) 105 CONFIG_X86_X32_ABI := y 106 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI 107 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI 108 else 109 $(warning CONFIG_X86_X32 enabled but no binutils support) 110 endif 111endif 112export CONFIG_X86_X32_ABI 113 114# Don't unroll struct assignments with kmemcheck enabled 115ifeq ($(CONFIG_KMEMCHECK),y) 116 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) 117endif 118 119# Stackpointer is addressed different for 32 bit and 64 bit x86 120sp-$(CONFIG_X86_32) := esp 121sp-$(CONFIG_X86_64) := rsp 122 123# do binutils support CFI? 124cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 125# is .cfi_signal_frame supported too? 126cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 127cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) 128 129# does binutils support specific instructions? 130asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1) 131avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1) 132avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1) 133 134KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) 135KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) 136 137LDFLAGS := -m elf_$(UTS_MACHINE) 138 139# Speed up the build 140KBUILD_CFLAGS += -pipe 141# Workaround for a gcc prelease that unfortunately was shipped in a suse release 142KBUILD_CFLAGS += -Wno-sign-compare 143# 144KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 145# prevent gcc from generating any FP code by mistake 146KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow 147KBUILD_CFLAGS += $(call cc-option,-mno-avx,) 148 149KBUILD_CFLAGS += $(mflags-y) 150KBUILD_AFLAGS += $(mflags-y) 151 152archscripts: scripts_basic 153 $(Q)$(MAKE) $(build)=arch/x86/tools relocs 154 155### 156# Syscall table generation 157 158archheaders: 159 $(Q)$(MAKE) $(build)=arch/x86/syscalls all 160 161### 162# Kernel objects 163 164head-y := arch/x86/kernel/head_$(BITS).o 165head-y += arch/x86/kernel/head$(BITS).o 166head-y += arch/x86/kernel/head.o 167 168libs-y += arch/x86/lib/ 169 170# See arch/x86/Kbuild for content of core part of the kernel 171core-y += arch/x86/ 172 173# drivers-y are linked after core-y 174drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 175drivers-$(CONFIG_PCI) += arch/x86/pci/ 176 177# must be linked after kernel/ 178drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 179 180# suspend and hibernation support 181drivers-$(CONFIG_PM) += arch/x86/power/ 182 183drivers-$(CONFIG_FB) += arch/x86/video/ 184 185#### 186# boot loader support. Several targets are kept for legacy purposes 187 188boot := arch/x86/boot 189 190BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 191 192PHONY += bzImage $(BOOT_TARGETS) 193 194# Default kernel to build 195all: bzImage 196 197# KBUILD_IMAGE specify target image being built 198KBUILD_IMAGE := $(boot)/bzImage 199 200bzImage: vmlinux 201ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) 202 $(Q)$(MAKE) $(build)=arch/x86/tools posttest 203endif 204 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 205 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 206 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 207 208$(BOOT_TARGETS): vmlinux 209 $(Q)$(MAKE) $(build)=$(boot) $@ 210 211PHONY += install 212install: 213 $(Q)$(MAKE) $(build)=$(boot) $@ 214 215PHONY += vdso_install 216vdso_install: 217 $(Q)$(MAKE) $(build)=arch/x86/vdso $@ 218 219archclean: 220 $(Q)rm -rf $(objtree)/arch/i386 221 $(Q)rm -rf $(objtree)/arch/x86_64 222 $(Q)$(MAKE) $(clean)=$(boot) 223 $(Q)$(MAKE) $(clean)=arch/x86/tools 224 225define archhelp 226 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 227 echo ' install - Install kernel using' 228 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 229 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 230 echo ' install to $$(INSTALL_PATH) and run lilo' 231 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 232 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 233 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 234 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 235 echo ' bzdisk/fdimage*/isoimage also accept:' 236 echo ' FDARGS="..." arguments for the booted kernel' 237 echo ' FDINITRD=file initrd for the booted kernel' 238endef 239