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 += $(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 += $(cflags-y)
  41
  42         # temporary until string.h is fixed
  43         KBUILD_CFLAGS += -ffreestanding
  44 else
  45         BITS := 64
  46         UTS_MACHINE := x86_64
  47         CHECKFLAGS += -D__x86_64__ -m64
  48
  49         KBUILD_AFLAGS += -m64
  50         KBUILD_CFLAGS += -m64
  51
  52         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  53         cflags-$(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_MATOM) += $(call cc-option,-march=atom) \
  59                 $(call cc-option,-mtune=atom,$(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
  73 endif
  74
  75 ifdef 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) $(biarch)),y)
  78                 stackp-y := -fstack-protector
  79                 KBUILD_CFLAGS += $(stackp-y)
  80         else
  81                 $(warning stack protector enabled but no compiler support)
  82         endif
  83 endif
  84
  85 # Don't unroll struct assignments with kmemcheck enabled
  86 ifeq ($(CONFIG_KMEMCHECK),y)
  87         KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
  88 endif
  89
  90 # Stackpointer is addressed different for 32 bit and 64 bit x86
  91 sp-$(CONFIG_X86_32) := esp
  92 sp-$(CONFIG_X86_64) := rsp
  93
  94 # do binutils support CFI?
  95 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
  96 # is .cfi_signal_frame supported too?
  97 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
  98 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
  99 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
 100
 101 LDFLAGS := -m elf_$(UTS_MACHINE)
 102
 103 # Speed up the build
 104 KBUILD_CFLAGS += -pipe
 105 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 106 KBUILD_CFLAGS += -Wno-sign-compare
 107 #
 108 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 109 # prevent gcc from generating any FP code by mistake
 110 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 111
 112 KBUILD_CFLAGS += $(mflags-y)
 113 KBUILD_AFLAGS += $(mflags-y)
 114
 115 ###
 116 # Kernel objects
 117
 118 head-y := arch/x86/kernel/head_$(BITS).o
 119 head-y += arch/x86/kernel/head$(BITS).o
 120 head-y += arch/x86/kernel/head.o
 121 head-y += arch/x86/kernel/init_task.o
 122
 123 libs-y  += arch/x86/lib/
 124
 125 # See arch/x86/Kbuild for content of core part of the kernel
 126 core-y += arch/x86/
 127
 128 # drivers-y are linked after core-y
 129 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 130 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 131
 132 # must be linked after kernel/
 133 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 134
 135 # suspend and hibernation support
 136 drivers-$(CONFIG_PM) += arch/x86/power/
 137
 138 ifeq ($(CONFIG_X86_32),y)
 139 drivers-$(CONFIG_FB) += arch/x86/video/
 140 endif
 141
 142 ####
 143 # boot loader support. Several targets are kept for legacy purposes
 144
 145 boot := arch/x86/boot
 146
 147 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 148
 149 PHONY += bzImage $(BOOT_TARGETS)
 150
 151 # Default kernel to build
 152 all: bzImage
 153
 154 # KBUILD_IMAGE specify target image being built
 155 KBUILD_IMAGE := $(boot)/bzImage
 156
 157 bzImage: vmlinux
 158         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 159         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 160         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 161
 162 $(BOOT_TARGETS): vmlinux
 163         $(Q)$(MAKE) $(build)=$(boot) $@
 164
 165 PHONY += install
 166 install:
 167         $(Q)$(MAKE) $(build)=$(boot) $@
 168
 169 PHONY += vdso_install
 170 vdso_install:
 171         $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 172
 173 archclean:
 174         $(Q)rm -rf $(objtree)/arch/i386
 175         $(Q)rm -rf $(objtree)/arch/x86_64
 176         $(Q)$(MAKE) $(clean)=$(boot)
 177
 178 define archhelp
 179   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 180   echo  '  install      - Install kernel using'
 181   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 182   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 183   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 184   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 185   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 186   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 187   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 188   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 189   echo  '                  FDARGS="..."  arguments for the booted kernel'
 190   echo  '                  FDINITRD=file initrd for the booted kernel'
 191 endef