arch/x86/Makefile

   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                 $(warning stack protector enabled but no compiler support)
  81         endif
  82 endif
  83
  84 # Stackpointer is addressed different for 32 bit and 64 bit x86
  85 sp-$(CONFIG_X86_32) := esp
  86 sp-$(CONFIG_X86_64) := rsp
  87
  88 # do binutils support CFI?
  89 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
  90 # is .cfi_signal_frame supported too?
  91 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
  92 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
  93 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
  94
  95 LDFLAGS := -m elf_$(UTS_MACHINE)
  96
  97 # Speed up the build
  98 KBUILD_CFLAGS += -pipe
  99 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 100 KBUILD_CFLAGS += -Wno-sign-compare
 101 #
 102 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 103 # prevent gcc from generating any FP code by mistake
 104 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 105
 106 KBUILD_CFLAGS += $(mflags-y)
 107 KBUILD_AFLAGS += $(mflags-y)
 108
 109 ###
 110 # Kernel objects
 111
 112 head-y := arch/x86/kernel/head_$(BITS).o
 113 head-y += arch/x86/kernel/head$(BITS).o
 114 head-y += arch/x86/kernel/head.o
 115 head-y += arch/x86/kernel/init_task.o
 116
 117 libs-y  += arch/x86/lib/
 118
 119 # See arch/x86/Kbuild for content of core part of the kernel
 120 core-y += arch/x86/
 121
 122 # drivers-y are linked after core-y
 123 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 124 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 125
 126 # must be linked after kernel/
 127 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 128
 129 # suspend and hibernation support
 130 drivers-$(CONFIG_PM) += arch/x86/power/
 131
 132 ifeq ($(CONFIG_X86_32),y)
 133 drivers-$(CONFIG_FB) += arch/x86/video/
 134 endif
 135
 136 ####
 137 # boot loader support. Several targets are kept for legacy purposes
 138
 139 boot := arch/x86/boot
 140
 141 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 142
 143 PHONY += bzImage $(BOOT_TARGETS)
 144
 145 # Default kernel to build
 146 all: bzImage
 147
 148 # KBUILD_IMAGE specify target image being built
 149 KBUILD_IMAGE := $(boot)/bzImage
 150
 151 bzImage: vmlinux
 152         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 153         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 154         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 155
 156 $(BOOT_TARGETS): vmlinux
 157         $(Q)$(MAKE) $(build)=$(boot) $@
 158
 159 PHONY += install
 160 install:
 161         $(Q)$(MAKE) $(build)=$(boot) $@
 162
 163 PHONY += vdso_install
 164 vdso_install:
 165         $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 166
 167 archclean:
 168         $(Q)rm -rf $(objtree)/arch/i386
 169         $(Q)rm -rf $(objtree)/arch/x86_64
 170         $(Q)$(MAKE) $(clean)=$(boot)
 171
 172 define archhelp
 173   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 174   echo  '  install      - Install kernel using'
 175   echo  '                  (your) ~/bin/installkernel or'
 176   echo  '                  (distribution) /sbin/installkernel or'
 177   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 178   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 179   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 180   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 181   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 182   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 183   echo  '                  FDARGS="..."  arguments for the booted kernel'
 184   echo  '                  FDINITRD=file initrd for the booted kernel'
 185 endef