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