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 # Use -mpreferred-stack-boundary=3 if supported. 53 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3) 54 55 # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) 56 cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8) 57 cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona) 58 59 cflags-$(CONFIG_MCORE2) += \ 60 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic)) 61 cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \ 62 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic)) 63 cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic) 64 KBUILD_CFLAGS += $(cflags-y) 65 66 KBUILD_CFLAGS += -mno-red-zone 67 KBUILD_CFLAGS += -mcmodel=kernel 68 69 # -funit-at-a-time shrinks the kernel .text considerably 70 # unfortunately it makes reading oopses harder. 71 KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) 72 73 # this works around some issues with generating unwind tables in older gccs 74 # newer gccs do it by default 75 KBUILD_CFLAGS += -maccumulate-outgoing-args 76endif 77 78ifdef CONFIG_CC_STACKPROTECTOR 79 cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh 80 ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y) 81 stackp-y := -fstack-protector 82 KBUILD_CFLAGS += $(stackp-y) 83 else 84 $(warning stack protector enabled but no compiler support) 85 endif 86endif 87 88ifdef CONFIG_X86_X32 89 x32_ld_ok := $(call try-run,\ 90 /bin/echo -e '1: .quad 1b' | \ 91 $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \ 92 $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \ 93 $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n) 94 ifeq ($(x32_ld_ok),y) 95 CONFIG_X86_X32_ABI := y 96 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI 97 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI 98 else 99 $(warning CONFIG_X86_X32 enabled but no binutils support) 100 endif 101endif 102export CONFIG_X86_X32_ABI 103 104# Don't unroll struct assignments with kmemcheck enabled 105ifeq ($(CONFIG_KMEMCHECK),y) 106 KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) 107endif 108 109# Stackpointer is addressed different for 32 bit and 64 bit x86 110sp-$(CONFIG_X86_32) := esp 111sp-$(CONFIG_X86_64) := rsp 112 113# do binutils support CFI? 114cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) 115# is .cfi_signal_frame supported too? 116cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) 117cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1) 118 119# does binutils support specific instructions? 120asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1) 121avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1) 122 123KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) 124KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) 125 126LDFLAGS := -m elf_$(UTS_MACHINE) 127 128# Speed up the build 129KBUILD_CFLAGS += -pipe 130# Workaround for a gcc prelease that unfortunately was shipped in a suse release 131KBUILD_CFLAGS += -Wno-sign-compare 132# 133KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 134# prevent gcc from generating any FP code by mistake 135KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,) 136KBUILD_CFLAGS += $(call cc-option,-mno-avx,) 137 138KBUILD_CFLAGS += $(mflags-y) 139KBUILD_AFLAGS += $(mflags-y) 140 141archscripts: 142 $(Q)$(MAKE) $(build)=arch/x86/tools relocs 143 144### 145# Syscall table generation 146 147archheaders: 148 $(Q)$(MAKE) $(build)=arch/x86/syscalls all 149 150### 151# Kernel objects 152 153head-y := arch/x86/kernel/head_$(BITS).o 154head-y += arch/x86/kernel/head$(BITS).o 155head-y += arch/x86/kernel/head.o 156 157libs-y += arch/x86/lib/ 158 159# See arch/x86/Kbuild for content of core part of the kernel 160core-y += arch/x86/ 161 162# drivers-y are linked after core-y 163drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ 164drivers-$(CONFIG_PCI) += arch/x86/pci/ 165 166# must be linked after kernel/ 167drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ 168 169# suspend and hibernation support 170drivers-$(CONFIG_PM) += arch/x86/power/ 171 172drivers-$(CONFIG_FB) += arch/x86/video/ 173 174#### 175# boot loader support. Several targets are kept for legacy purposes 176 177boot := arch/x86/boot 178 179BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage 180 181PHONY += bzImage $(BOOT_TARGETS) 182 183# Default kernel to build 184all: bzImage 185 186# KBUILD_IMAGE specify target image being built 187KBUILD_IMAGE := $(boot)/bzImage 188 189bzImage: vmlinux 190ifeq ($(CONFIG_X86_DECODER_SELFTEST),y) 191 $(Q)$(MAKE) $(build)=arch/x86/tools posttest 192endif 193 $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) 194 $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot 195 $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ 196 197$(BOOT_TARGETS): vmlinux 198 $(Q)$(MAKE) $(build)=$(boot) $@ 199 200PHONY += install 201install: 202 $(Q)$(MAKE) $(build)=$(boot) $@ 203 204PHONY += vdso_install 205vdso_install: 206 $(Q)$(MAKE) $(build)=arch/x86/vdso $@ 207 208archclean: 209 $(Q)rm -rf $(objtree)/arch/i386 210 $(Q)rm -rf $(objtree)/arch/x86_64 211 $(Q)$(MAKE) $(clean)=$(boot) 212 $(Q)$(MAKE) $(clean)=arch/x86/tools 213 214define archhelp 215 echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' 216 echo ' install - Install kernel using' 217 echo ' (your) ~/bin/$(INSTALLKERNEL) or' 218 echo ' (distribution) /sbin/$(INSTALLKERNEL) or' 219 echo ' install to $$(INSTALL_PATH) and run lilo' 220 echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 221 echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' 222 echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' 223 echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' 224 echo ' bzdisk/fdimage*/isoimage also accept:' 225 echo ' FDARGS="..." arguments for the booted kernel' 226 echo ' FDINITRD=file initrd for the booted kernel' 227endef 228