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 42# 43# Prevent GCC from generating any FP code by mistake. 44# 45# This must happen before we try the -mpreferred-stack-boundary, see: 46# 47# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383 48# 49KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow 50KBUILD_CFLAGS += $(call cc-option,-mno-avx,) 51 52ifeq ($(CONFIG_X86_32),y) 53 BITS := 32 54 UTS_MACHINE := i386 55 CHECKFLAGS += -D__i386__ 56 57 biarch := $(call cc-option,-m32) 58 KBUILD_AFLAGS += $(biarch) 59 KBUILD_CFLAGS += $(biarch) 60 61 KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return 62 63 # Never want PIC in a 32-bit kernel, prevent breakage with GCC built 64 # with nonstandard options 65 KBUILD_CFLAGS += -fno-pic 66 67 # prevent gcc from keeping the stack 16 byte aligned 68 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) 69 70 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use 71 # a lot more stack due to the lack of sharing of stacklots: 72 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \ 73 $(call cc-option,-fno-unit-at-a-time)) 74 75 # CPU-specific tuning. Anything which can be shared with UML should go here. 76 include arch/x86/Makefile_32.cpu 77 KBUILD_CFLAGS += $(cflags-y) 78 79 # temporary until string.h is fixed 80 KBUILD_CFLAGS += -ffreestanding 81else 82 BITS := 64 83 UTS_MACHINE := x86_64 84 CHECKFLAGS += -D__x86_64__ -m64 85 86 biarch := -m64 87 KBUILD_AFLAGS += -m64 88 KBUILD_CFLAGS += -m64 89 90 # Align jump targets to 1 byte, not the default 16 bytes: 91 KBUILD_CFLAGS += -falign-jumps=1 92 93 # Pack loops tightly as well: 94 KBUILD_CFLAGS += -falign-loops=1 95 96 # Don't autogenerate traditional x87 instructions 97 KBUILD_CFLAGS += $(call cc-option,-mno-80387) 98 KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387) 99 100 # Use -mpreferred-stack-boundary=3 if supported. 101 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3) 102 103 # Use -mskip-rax-setup if supported. 104 KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup) 105 106 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) 107 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) 108 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) 109 110 cflags-$(CONFIG_MCORE2) += \ 111 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) 112 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ 113 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 114 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 115 KBUILD_CFLAGS += $(cflags-y) 116 117 KBUILD_CFLAGS += -mno-red-zone 118 KBUILD_CFLAGS += -mcmodel=kernel 119 120 # -funit-at-a-time shrinks the kernel .text considerably 121 # unfortunately it makes reading oopses harder. 122 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 123 124 # this works around some issues with generating unwind tables in older gccs 125 # newer gccs do it by default 126 KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args) 127endif 128 129# Make sure compiler does not have buggy stack-protector support. 130ifdef CONFIG_CC_STACKPROTECTOR 131 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 132 ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 133 $(warning stack-protector enabled but compiler support broken) 134 endif 135endif 136 137ifdef CONFIG_X86_X32 138 x32_ld_ok := $(call try-run,\ 139 /bin/echo -e '1: .quad 1b' | \ 140 $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \ 141 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ 142 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) 143 ifeq ($(x32_ld_ok),y) 144 CONFIG_X86_X32_ABI := y 145 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI 146 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI 147 else 148 $(warning CONFIG_X86_X32 enabled but no binutils support) 149 endif 150endif 151export CONFIG_X86_X32_ABI 152 153# Don't unroll struct assignments with kmemcheck enabled 154ifeq ($(CONFIG_KMEMCHECK),y) 155 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) 156endif 157 158# Stackpointer is addressed different for 32 bit and 64 bit x86 159sp-$(CONFIG_X86_32) := esp 160sp-$(CONFIG_X86_64) := rsp 161 162# do binutils support CFI? 163cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 164# is .cfi_signal_frame supported too? 165cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 166cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) 167 168# does binutils support specific instructions? 169asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1) 170asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1) 171asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1) 172avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1) 173avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1) 174sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1) 175sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1) 176 177KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(sha1_ni_instr) $(sha256_ni_instr) 178KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(sha1_ni_instr) $(sha256_ni_instr) 179 180LDFLAGS := -m elf_$(UTS_MACHINE) 181 182# Speed up the build 183KBUILD_CFLAGS += -pipe 184# Workaround for a gcc prelease that unfortunately was shipped in a suse release 185KBUILD_CFLAGS += -Wno-sign-compare 186# 187KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 188 189KBUILD_CFLAGS += $(mflags-y) 190KBUILD_AFLAGS += $(mflags-y) 191 192archscripts: scripts_basic 193 $(Q)$(MAKE) $(build)=arch/x86/tools relocs 194 195### 196# Syscall table generation 197 198archheaders: 199 $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all 200 201archprepare: 202ifeq ($(CONFIG_KEXEC_FILE),y) 203 $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c 204endif 205 206### 207# Kernel objects 208 209head-y := arch/x86/kernel/head_$(BITS).o 210head-y += arch/x86/kernel/head$(BITS).o 211head-y += arch/x86/kernel/head.o 212 213libs-y += arch/x86/lib/ 214 215# See arch/x86/Kbuild for content of core part of the kernel 216core-y += arch/x86/ 217 218# drivers-y are linked after core-y 219drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 220drivers-$(CONFIG_PCI) += arch/x86/pci/ 221 222# must be linked after kernel/ 223drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 224 225# suspend and hibernation support 226drivers-$(CONFIG_PM) += arch/x86/power/ 227 228drivers-$(CONFIG_FB) += arch/x86/video/ 229 230drivers-$(CONFIG_RAS) += arch/x86/ras/ 231 232#### 233# boot loader support. Several targets are kept for legacy purposes 234 235boot := arch/x86/boot 236 237BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 238 239PHONY += bzImage $(BOOT_TARGETS) 240 241# Default kernel to build 242all: bzImage 243 244# KBUILD_IMAGE specify target image being built 245KBUILD_IMAGE := $(boot)/bzImage 246 247bzImage: vmlinux 248ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) 249 $(Q)$(MAKE) $(build)=arch/x86/tools posttest 250endif 251 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 252 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 253 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 254 255$(BOOT_TARGETS): vmlinux 256 $(Q)$(MAKE) $(build)=$(boot) $@ 257 258PHONY += install 259install: 260 $(Q)$(MAKE) $(build)=$(boot) $@ 261 262PHONY += vdso_install 263vdso_install: 264 $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@ 265 266archclean: 267 $(Q)rm -rf $(objtree)/arch/i386 268 $(Q)rm -rf $(objtree)/arch/x86_64 269 $(Q)$(MAKE) $(clean)=$(boot) 270 $(Q)$(MAKE) $(clean)=arch/x86/tools 271 $(Q)$(MAKE) $(clean)=arch/x86/purgatory 272 273define archhelp 274 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 275 echo ' install - Install kernel using' 276 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 277 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 278 echo ' install to $$(INSTALL_PATH) and run lilo' 279 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 280 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 281 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 282 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 283 echo ' bzdisk/fdimage*/isoimage also accept:' 284 echo ' FDARGS="..." arguments for the booted kernel' 285 echo ' FDINITRD=file initrd for the booted kernel' 286endef 287