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