LXR linux/arch/x86/Makefile

   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 := $(ARCH)_defconfig
   8endif
   9
  10core-$(CONFIG_KVM) += arch/x86/kvm/
  11
  12# BITS is used as extension for files which are available in a 32 bit
  13# and a 64 bit version to simplify shared Makefiles.
  14# e.g.: obj-y += foo_$(BITS).o
  15export BITS
  16
  17ifeq ($(CONFIG_X86_32),y)
  18        BITS := 32
  19        UTS_MACHINE := i386
  20        CHECKFLAGS += -D__i386__
  21
  22        biarch := $(call cc-option,-m32)
  23        KBUILD_AFLAGS += $(biarch)
  24        KBUILD_CFLAGS += $(biarch)
  25
  26        ifdef CONFIG_RELOCATABLE
  27                LDFLAGS_vmlinux := --emit-relocs
  28        endif
  29
  30        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
  31
  32        # prevent gcc from keeping the stack 16 byte aligned
  33        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
  34
  35        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
  36        # a lot more stack due to the lack of sharing of stacklots:
  37        KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
  38                echo $(call cc-option,-fno-unit-at-a-time); fi ;)
  39
  40        # CPU-specific tuning. Anything which can be shared with UML should go here.
  41        include $(srctree)/arch/x86/Makefile_32.cpu
  42        KBUILD_CFLAGS += $(cflags-y)
  43
  44        # temporary until string.h is fixed
  45        KBUILD_CFLAGS += -ffreestanding
  46else
  47        BITS := 64
  48        UTS_MACHINE := x86_64
  49        CHECKFLAGS += -D__x86_64__ -m64
  50
  51        KBUILD_AFLAGS += -m64
  52        KBUILD_CFLAGS += -m64
  53
  54        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  55        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
  56        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  57
  58        cflags-$(CONFIG_MCORE2) += \
  59                $(call cc-option,-march=core2,$(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) $(CC)),y)
  78                stackp-y := -fstack-protector
  79                stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all
  80                KBUILD_CFLAGS += $(stackp-y)
  81        else
  82                $(warning stack protector enabled but no compiler support)
  83        endif
  84endif
  85
  86# Stackpointer is addressed different for 32 bit and 64 bit x86
  87sp-$(CONFIG_X86_32) := esp
  88sp-$(CONFIG_X86_64) := rsp
  89
  90# do binutils support CFI?
  91cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
  92# is .cfi_signal_frame supported too?
  93cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
  94KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
  95KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
  96
  97LDFLAGS := -m elf_$(UTS_MACHINE)
  98
  99# Speed up the build
 100KBUILD_CFLAGS += -pipe
 101# Workaround for a gcc prelease that unfortunately was shipped in a suse release
 102KBUILD_CFLAGS += -Wno-sign-compare
 103#
 104KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 105# prevent gcc from generating any FP code by mistake
 106KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 107
 108KBUILD_CFLAGS += $(mflags-y)
 109KBUILD_AFLAGS += $(mflags-y)
 110
 111###
 112# Kernel objects
 113
 114head-y := arch/x86/kernel/head_$(BITS).o
 115head-y += arch/x86/kernel/head$(BITS).o
 116head-y += arch/x86/kernel/head.o
 117head-y += arch/x86/kernel/init_task.o
 118
 119libs-y  += arch/x86/lib/
 120
 121# Sub architecture files that needs linking first
 122core-y += $(fcore-y)
 123
 124# Xen paravirtualization support
 125core-$(CONFIG_XEN) += arch/x86/xen/
 126
 127# lguest paravirtualization support
 128core-$(CONFIG_LGUEST_GUEST) += arch/x86/lguest/
 129
 130core-y += arch/x86/kernel/
 131core-y += arch/x86/mm/
 132
 133core-y += arch/x86/crypto/
 134core-y += arch/x86/vdso/
 135core-$(CONFIG_IA32_EMULATION) += arch/x86/ia32/
 136
 137# drivers-y are linked after core-y
 138drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 139drivers-$(CONFIG_PCI)            += arch/x86/pci/
 140
 141# must be linked after kernel/
 142drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 143
 144# suspend and hibernation support
 145drivers-$(CONFIG_PM) += arch/x86/power/
 146
 147ifeq ($(CONFIG_X86_32),y)
 148drivers-$(CONFIG_FB) += arch/x86/video/
 149endif
 150
 151####
 152# boot loader support. Several targets are kept for legacy purposes
 153
 154boot := arch/x86/boot
 155
 156BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 157
 158PHONY += bzImage $(BOOT_TARGETS)
 159
 160# Default kernel to build
 161all: bzImage
 162
 163# KBUILD_IMAGE specify target image being built
 164KBUILD_IMAGE := $(boot)/bzImage
 165
 166bzImage: vmlinux
 167        $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 168        $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 169        $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 170
 171$(BOOT_TARGETS): vmlinux
 172        $(Q)$(MAKE) $(build)=$(boot) $@
 173
 174PHONY += install
 175install:
 176        $(Q)$(MAKE) $(build)=$(boot) $@
 177
 178PHONY += vdso_install
 179vdso_install:
 180        $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 181
 182archclean:
 183        $(Q)rm -rf $(objtree)/arch/i386
 184        $(Q)rm -rf $(objtree)/arch/x86_64
 185        $(Q)$(MAKE) $(clean)=$(boot)
 186
 187define archhelp
 188  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 189  echo  '  install      - Install kernel using'
 190  echo  '                  (your) ~/bin/installkernel or'
 191  echo  '                  (distribution) /sbin/installkernel or'
 192  echo  '                  install to $$(INSTALL_PATH) and run lilo'
 193  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 194  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 195  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 196  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 197  echo  '                  bzdisk/fdimage*/isoimage also accept:'
 198  echo  '                  FDARGS="..."  arguments for the booted kernel'
 199  echo  '                  FDINITRD=file initrd for the booted kernel'
 200endef
 201