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                 $(warning stack protector enabled but no compiler support)
  81         endif
  82 endif
  83
  84 # Don't unroll struct assignments with kmemcheck enabled
  85 ifeq ($(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