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 # prevent gcc from keeping the stack 16 byte aligned 31 KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2) 32 33 # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use 34 # a lot more stack due to the lack of sharing of stacklots: 35 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \ 36 $(call cc-option,-fno-unit-at-a-time)) 37 38 # CPU-specific tuning. Anything which can be shared with UML should go here. 39 include $(srctree)/arch/x86/Makefile_32.cpu 40 KBUILD_CFLAGS += $(cflags-y) 41 42 # temporary until string.h is fixed 43 KBUILD_CFLAGS += -ffreestanding 44else 45 BITS := 64 46 UTS_MACHINE := x86_64 47 CHECKFLAGS += -D__x86_64__ -m64 48 49 KBUILD_AFLAGS += -m64 50 KBUILD_CFLAGS += -m64 51 52 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) 53 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) 54 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) 55 56 cflags-$(CONFIG_MCORE2) += \ 57 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) 58 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ 59 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 60 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 61 KBUILD_CFLAGS += $(cflags-y) 62 63 KBUILD_CFLAGS += -mno-red-zone 64 KBUILD_CFLAGS += -mcmodel=kernel 65 66 # -funit-at-a-time shrinks the kernel .text considerably 67 # unfortunately it makes reading oopses harder. 68 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 69 70 # this works around some issues with generating unwind tables in older gccs 71 # newer gccs do it by default 72 KBUILD_CFLAGS += -maccumulate-outgoing-args 73endif 74 75ifdef CONFIG_CC_STACKPROTECTOR 76 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 77 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 78 stackp-y := -fstack-protector 79 KBUILD_CFLAGS += $(stackp-y) 80 else 81 $(warning stack protector enabled but no compiler support) 82 endif 83endif 84 85ifdef CONFIG_X86_X32 86 x32_ld_ok := $(call try-run,\ 87 /bin/echo -e '1: .quad 1b' | \ 88 $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \ 89 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ 90 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) 91 ifeq ($(x32_ld_ok),y) 92 CONFIG_X86_X32_ABI := y 93 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI 94 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI 95 else 96 $(warning CONFIG_X86_X32 enabled but no binutils support) 97 endif 98endif 99export CONFIG_X86_X32_ABI 100 101# Don't unroll struct assignments with kmemcheck enabled 102ifeq ($(CONFIG_KMEMCHECK),y) 103 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) 104endif 105 106# Stackpointer is addressed different for 32 bit and 64 bit x86 107sp-$(CONFIG_X86_32) := esp 108sp-$(CONFIG_X86_64) := rsp 109 110# do binutils support CFI? 111cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 112# is .cfi_signal_frame supported too? 113cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 114cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) 115 116# does binutils support specific instructions? 117asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1) 118avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1) 119 120KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) 121KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) 122 123LDFLAGS := -m elf_$(UTS_MACHINE) 124 125# Speed up the build 126KBUILD_CFLAGS += -pipe 127# Workaround for a gcc prelease that unfortunately was shipped in a suse release 128KBUILD_CFLAGS += -Wno-sign-compare 129# 130KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 131# prevent gcc from generating any FP code by mistake 132KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,) 133KBUILD_CFLAGS += $(call cc-option,-mno-avx,) 134 135KBUILD_CFLAGS += $(mflags-y) 136KBUILD_AFLAGS += $(mflags-y) 137 138archscripts: 139 $(Q)$(MAKE) $(build)=arch/x86/tools relocs 140 141### 142# Syscall table generation 143 144archheaders: 145 $(Q)$(MAKE) $(build)=arch/x86/syscalls all 146 147### 148# Kernel objects 149 150head-y := arch/x86/kernel/head_$(BITS).o 151head-y += arch/x86/kernel/head$(BITS).o 152head-y += arch/x86/kernel/head.o 153 154libs-y += arch/x86/lib/ 155 156# See arch/x86/Kbuild for content of core part of the kernel 157core-y += arch/x86/ 158 159# drivers-y are linked after core-y 160drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 161drivers-$(CONFIG_PCI) += arch/x86/pci/ 162 163# must be linked after kernel/ 164drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 165 166# suspend and hibernation support 167drivers-$(CONFIG_PM) += arch/x86/power/ 168 169drivers-$(CONFIG_FB) += arch/x86/video/ 170 171#### 172# boot loader support. Several targets are kept for legacy purposes 173 174boot := arch/x86/boot 175 176BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 177 178PHONY += bzImage $(BOOT_TARGETS) 179 180# Default kernel to build 181all: bzImage 182 183# KBUILD_IMAGE specify target image being built 184KBUILD_IMAGE := $(boot)/bzImage 185 186bzImage: vmlinux 187ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) 188 $(Q)$(MAKE) $(build)=arch/x86/tools posttest 189endif 190 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 191 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 192 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 193 194$(BOOT_TARGETS): vmlinux 195 $(Q)$(MAKE) $(build)=$(boot) $@ 196 197PHONY += install 198install: 199 $(Q)$(MAKE) $(build)=$(boot) $@ 200 201PHONY += vdso_install 202vdso_install: 203 $(Q)$(MAKE) $(build)=arch/x86/vdso $@ 204 205archclean: 206 $(Q)rm -rf $(objtree)/arch/i386 207 $(Q)rm -rf $(objtree)/arch/x86_64 208 $(Q)$(MAKE) $(clean)=$(boot) 209 $(Q)$(MAKE) $(clean)=arch/x86/tools 210 211define archhelp 212 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 213 echo ' install - Install kernel using' 214 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 215 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 216 echo ' install to $$(INSTALL_PATH) and run lilo' 217 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 218 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 219 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 220 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 221 echo ' bzdisk/fdimage*/isoimage also accept:' 222 echo ' FDARGS="..." arguments for the booted kernel' 223 echo ' FDINITRD=file initrd for the booted kernel' 224endef 225