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 := $(ARCH)_defconfig 12endif 13 14# How to compile the 16-bit code. Note we always compile for -march=i386; 15# that way we can complain to the user if the CPU is insufficient. 16# 17# The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For 18# older versions of GCC, include an *assembly* header to make sure that 19# gcc doesn't play any games behind our back. 20CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h 21M16_CFLAGS := $(call cc-option, -m16, $(CODE16GCC_CFLAGS)) 22 23REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -D__KERNEL__ \ 24 -DDISABLE_BRANCH_PROFILING \ 25 -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \ 26 -fno-strict-aliasing -fomit-frame-pointer -fno-pic \ 27 -mno-mmx -mno-sse \ 28 $(call cc-option, -ffreestanding) \ 29 $(call cc-option, -fno-stack-protector) \ 30 $(call cc-option, -mpreferred-stack-boundary=2) 31export REALMODE_CFLAGS 32 33# BITS is used as extension for files which are available in a 32 bit 34# and a 64 bit version to simplify shared Makefiles. 35# e.g.: obj-y += foo_$(BITS).o 36export BITS 37 38ifdef CONFIG_X86_NEED_RELOCS 39 LDFLAGS_vmlinux := --emit-relocs 40endif 41 42ifeq ($(CONFIG_X86_32),y) 43 BITS := 32 44 UTS_MACHINE := i386 45 CHECKFLAGS += -D__i386__ 46 47 biarch := $(call cc-option,-m32) 48 KBUILD_AFLAGS += $(biarch) 49 KBUILD_CFLAGS += $(biarch) 50 51 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return 52 53 # Don't autogenerate MMX or SSE instructions 54 KBUILD_CFLAGS += -mno-mmx -mno-sse 55 56 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built 57 # with nonstandard options 58 KBUILD_CFLAGS += -fno-pic 59 60 # prevent gcc from keeping the stack 16 byte aligned 61 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) 62 63 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use 64 # a lot more stack due to the lack of sharing of stacklots: 65 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \ 66 $(call cc-option,-fno-unit-at-a-time)) 67 68 # CPU-specific tuning. Anything which can be shared with UML should go here. 69 include $(srctree)/arch/x86/Makefile_32.cpu 70 KBUILD_CFLAGS += $(cflags-y) 71 72 # temporary until string.h is fixed 73 KBUILD_CFLAGS += -ffreestanding 74else 75 BITS := 64 76 UTS_MACHINE := x86_64 77 CHECKFLAGS += -D__x86_64__ -m64 78 79 biarch := -m64 80 KBUILD_AFLAGS += -m64 81 KBUILD_CFLAGS += -m64 82 83 # Don't autogenerate traditional x87, MMX or SSE instructions 84 KBUILD_CFLAGS += -mno-mmx -mno-sse 85 KBUILD_CFLAGS += $(call cc-option,-mno-80387) 86 KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387) 87 88 # Use -mpreferred-stack-boundary=3 if supported. 89 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3) 90 91 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) 92 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) 93 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) 94 95 cflags-$(CONFIG_MCORE2) += \ 96 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) 97 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ 98 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 99 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 100 KBUILD_CFLAGS += $(cflags-y) 101 102 KBUILD_CFLAGS += -mno-red-zone 103 KBUILD_CFLAGS += -mcmodel=kernel 104 105 # -funit-at-a-time shrinks the kernel .text considerably 106 # unfortunately it makes reading oopses harder. 107 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 108 109 # this works around some issues with generating unwind tables in older gccs 110 # newer gccs do it by default 111 KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args) 112endif 113 114# Make sure compiler does not have buggy stack-protector support. 115ifdef CONFIG_CC_STACKPROTECTOR 116 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 117 ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 118 $(warning stack-protector enabled but compiler support broken) 119 endif 120endif 121 122ifdef CONFIG_X86_X32 123 x32_ld_ok := $(call try-run,\ 124 /bin/echo -e '1: .quad 1b' | \ 125 $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ 126 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ 127 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) 128 ifeq ($(x32_ld_ok),y) 129 CONFIG_X86_X32_ABI := y 130 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI 131 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI 132 else 133 $(warning CONFIG_X86_X32 enabled but no binutils support) 134 endif 135endif 136export CONFIG_X86_X32_ABI 137 138# Don't unroll struct assignments with kmemcheck enabled 139ifeq ($(CONFIG_KMEMCHECK),y) 140 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) 141endif 142 143# Stackpointer is addressed different for 32 bit and 64 bit x86 144sp-$(CONFIG_X86_32) := esp 145sp-$(CONFIG_X86_64) := rsp 146 147# do binutils support CFI? 148cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 149# is .cfi_signal_frame supported too? 150cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 151cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) 152 153# does binutils support specific instructions? 154asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1) 155asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1) 156avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1) 157avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1) 158 159KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) 160KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) 161 162LDFLAGS := -m elf_$(UTS_MACHINE) 163 164# Speed up the build 165KBUILD_CFLAGS += -pipe 166# Workaround for a gcc prelease that unfortunately was shipped in a suse release 167KBUILD_CFLAGS += -Wno-sign-compare 168# 169KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 170# prevent gcc from generating any FP code by mistake 171KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,) 172KBUILD_CFLAGS += $(call cc-option,-mno-avx,) 173 174KBUILD_CFLAGS += $(mflags-y) 175KBUILD_AFLAGS += $(mflags-y) 176 177archscripts: scripts_basic 178 $(Q)$(MAKE) $(build)=arch/x86/tools relocs 179 180### 181# Syscall table generation 182 183archheaders: 184 $(Q)$(MAKE) $(build)=arch/x86/syscalls all 185 186archprepare: 187ifeq ($(CONFIG_KEXEC),y) 188# Build only for 64bit. No loaders for 32bit yet. 189 ifeq ($(CONFIG_X86_64),y) 190 $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c 191 endif 192endif 193 194### 195# Kernel objects 196 197head-y := arch/x86/kernel/head_$(BITS).o 198head-y += arch/x86/kernel/head$(BITS).o 199head-y += arch/x86/kernel/head.o 200 201libs-y += arch/x86/lib/ 202 203# See arch/x86/Kbuild for content of core part of the kernel 204core-y += arch/x86/ 205 206# drivers-y are linked after core-y 207drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 208drivers-$(CONFIG_PCI) += arch/x86/pci/ 209 210# must be linked after kernel/ 211drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 212 213# suspend and hibernation support 214drivers-$(CONFIG_PM) += arch/x86/power/ 215 216drivers-$(CONFIG_FB) += arch/x86/video/ 217 218#### 219# boot loader support. Several targets are kept for legacy purposes 220 221boot := arch/x86/boot 222 223BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 224 225PHONY += bzImage $(BOOT_TARGETS) 226 227# Default kernel to build 228all: bzImage 229 230# KBUILD_IMAGE specify target image being built 231KBUILD_IMAGE := $(boot)/bzImage 232 233bzImage: vmlinux 234ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) 235 $(Q)$(MAKE) $(build)=arch/x86/tools posttest 236endif 237 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 238 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 239 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 240 241$(BOOT_TARGETS): vmlinux 242 $(Q)$(MAKE) $(build)=$(boot) $@ 243 244PHONY += install 245install: 246 $(Q)$(MAKE) $(build)=$(boot) $@ 247 248PHONY += vdso_install 249vdso_install: 250 $(Q)$(MAKE) $(build)=arch/x86/vdso $@ 251 252archclean: 253 $(Q)rm -rf $(objtree)/arch/i386 254 $(Q)rm -rf $(objtree)/arch/x86_64 255 $(Q)$(MAKE) $(clean)=$(boot) 256 $(Q)$(MAKE) $(clean)=arch/x86/tools 257 258PHONY += kvmconfig 259kvmconfig: 260 $(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target)) 261 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/kvm_guest.config 262 $(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig 263 264define archhelp 265 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 266 echo ' install - Install kernel using' 267 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 268 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 269 echo ' install to $$(INSTALL_PATH) and run lilo' 270 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 271 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 272 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 273 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 274 echo ' bzdisk/fdimage*/isoimage also accept:' 275 echo ' FDARGS="..." arguments for the booted kernel' 276 echo ' FDINITRD=file initrd for the booted kernel' 277 echo ' kvmconfig - Enable additional options for guest kernel support' 278endef 279