| 1 | # Unified Makefile for i386 and x86_64 |
| 2 | |
| 3 | # select defconfig based on actual architecture |
| 4 | ifeq ($(ARCH),x86) |
| 5 | KBUILD_DEFCONFIG := i386_defconfig |
| 6 | else |
| 7 | KBUILD_DEFCONFIG := $(ARCH)_defconfig |
| 8 | endif |
| 9 | |
| 10 | # BITS is used as extension for files which are available in a 32 bit |
| 11 | # and a 64 bit version to simplify shared Makefiles. |
| 12 | # e.g.: obj-y += foo_$(BITS).o |
| 13 | export BITS |
| 14 | |
| 15 | ifeq ($(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 += $(shell if [ $(call cc-version) -lt 0400 ] ; then \ |
| 36 | echo $(call cc-option,-fno-unit-at-a-time); fi ;) |
| 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 += $(cflags-y) |
| 41 | |
| 42 | # temporary until string.h is fixed |
| 43 | KBUILD_CFLAGS += -ffreestanding |
| 44 | else |
| 45 | BITS := 64 |
| 46 | UTS_MACHINE := x86_64 |
| 47 | CHECKFLAGS += -D__x86_64__ -m64 |
| 48 | |
| 49 | KBUILD_AFLAGS += -m64 |
| 50 | KBUILD_CFLAGS += -m64 |
| 51 | |
| 52 | # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu) |
| 53 | cflags-$(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_GENERIC_CPU) += $(call cc-option,-mtune=generic) |
| 59 | KBUILD_CFLAGS += $(cflags-y) |
| 60 | |
| 61 | KBUILD_CFLAGS += -mno-red-zone |
| 62 | KBUILD_CFLAGS += -mcmodel=kernel |
| 63 | |
| 64 | # -funit-at-a-time shrinks the kernel .text considerably |
| 65 | # unfortunately it makes reading oopses harder. |
| 66 | KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) |
| 67 | |
| 68 | # this works around some issues with generating unwind tables in older gccs |
| 69 | # newer gccs do it by default |
| 70 | KBUILD_CFLAGS += -maccumulate-outgoing-args |
| 71 | endif |
| 72 | |
| 73 | ifdef CONFIG_CC_STACKPROTECTOR |
| 74 | cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh |
| 75 | ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC)),y) |
| 76 | stackp-y := -fstack-protector |
| 77 | stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all |
| 78 | KBUILD_CFLAGS += $(stackp-y) |
| 79 | else |
| 80 | $(warning stack protector enabled but no compiler support) |
| 81 | endif |
| 82 | endif |
| 83 | |
| 84 | # Don't unroll struct assignments with kmemcheck enabled |
| 85 | ifeq ($(CONFIG_KMEMCHECK),y) |
| 86 | KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy) |
| 87 | endif |
| 88 | |
| 89 | # Stackpointer is addressed different for 32 bit and 64 bit x86 |
| 90 | sp-$(CONFIG_X86_32) := esp |
| 91 | sp-$(CONFIG_X86_64) := rsp |
| 92 | |
| 93 | # do binutils support CFI? |
| 94 | cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1) |
| 95 | # is .cfi_signal_frame supported too? |
| 96 | cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1) |
| 97 | KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) |
| 98 | KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) |
| 99 | |
| 100 | LDFLAGS := -m elf_$(UTS_MACHINE) |
| 101 | |
| 102 | # Speed up the build |
| 103 | KBUILD_CFLAGS += -pipe |
| 104 | # Workaround for a gcc prelease that unfortunately was shipped in a suse release |
| 105 | KBUILD_CFLAGS += -Wno-sign-compare |
| 106 | # |
| 107 | KBUILD_CFLAGS += -fno-asynchronous-unwind-tables |
| 108 | # prevent gcc from generating any FP code by mistake |
| 109 | KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,) |
| 110 | |
| 111 | KBUILD_CFLAGS += $(mflags-y) |
| 112 | KBUILD_AFLAGS += $(mflags-y) |
| 113 | |
| 114 | ### |
| 115 | # Kernel objects |
| 116 | |
| 117 | head-y := arch/x86/kernel/head_$(BITS).o |
| 118 | head-y += arch/x86/kernel/head$(BITS).o |
| 119 | head-y += arch/x86/kernel/head.o |
| 120 | head-y += arch/x86/kernel/init_task.o |
| 121 | |
| 122 | libs-y += arch/x86/lib/ |
| 123 | |
| 124 | # See arch/x86/Kbuild for content of core part of the kernel |
| 125 | core-y += arch/x86/ |
| 126 | |
| 127 | # drivers-y are linked after core-y |
| 128 | drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/ |
| 129 | drivers-$(CONFIG_PCI) += arch/x86/pci/ |
| 130 | |
| 131 | # must be linked after kernel/ |
| 132 | drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/ |
| 133 | |
| 134 | # suspend and hibernation support |
| 135 | drivers-$(CONFIG_PM) += arch/x86/power/ |
| 136 | |
| 137 | ifeq ($(CONFIG_X86_32),y) |
| 138 | drivers-$(CONFIG_FB) += arch/x86/video/ |
| 139 | endif |
| 140 | |
| 141 | #### |
| 142 | # boot loader support. Several targets are kept for legacy purposes |
| 143 | |
| 144 | boot := arch/x86/boot |
| 145 | |
| 146 | BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage |
| 147 | |
| 148 | PHONY += bzImage $(BOOT_TARGETS) |
| 149 | |
| 150 | # Default kernel to build |
| 151 | all: bzImage |
| 152 | |
| 153 | # KBUILD_IMAGE specify target image being built |
| 154 | KBUILD_IMAGE := $(boot)/bzImage |
| 155 | |
| 156 | bzImage: vmlinux |
| 157 | $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE) |
| 158 | $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot |
| 159 | $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@ |
| 160 | |
| 161 | $(BOOT_TARGETS): vmlinux |
| 162 | $(Q)$(MAKE) $(build)=$(boot) $@ |
| 163 | |
| 164 | PHONY += install |
| 165 | install: |
| 166 | $(Q)$(MAKE) $(build)=$(boot) $@ |
| 167 | |
| 168 | PHONY += vdso_install |
| 169 | vdso_install: |
| 170 | $(Q)$(MAKE) $(build)=arch/x86/vdso $@ |
| 171 | |
| 172 | archclean: |
| 173 | $(Q)rm -rf $(objtree)/arch/i386 |
| 174 | $(Q)rm -rf $(objtree)/arch/x86_64 |
| 175 | $(Q)$(MAKE) $(clean)=$(boot) |
| 176 | |
| 177 | define archhelp |
| 178 | echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)' |
| 179 | echo ' install - Install kernel using' |
| 180 | echo ' (your) ~/bin/installkernel or' |
| 181 | echo ' (distribution) /sbin/installkernel or' |
| 182 | echo ' install to $$(INSTALL_PATH) and run lilo' |
| 183 | echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' |
| 184 | echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)' |
| 185 | echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)' |
| 186 | echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)' |
| 187 | echo ' bzdisk/fdimage*/isoimage also accept:' |
| 188 | echo ' FDARGS="..." arguments for the booted kernel' |
| 189 | echo ' FDINITRD=file initrd for the booted kernel' |
| 190 | endef |