linux/arch/x86/Makefile
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   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 := $(ARCH)_defconfig
   8endif
   9
  10# BITS is used as extension for files which are available in a 32 bit
  11# and a 64 bit version to simplify shared Makefiles.
  12# e.g.: obj-y += foo_$(BITS).o
  13export BITS
  14
  15ifeq ($(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 += $(cflags-y)
  41
  42        # temporary until string.h is fixed
  43        KBUILD_CFLAGS += -ffreestanding
  44else
  45        BITS := 64
  46        UTS_MACHINE := x86_64
  47        CHECKFLAGS += -D__x86_64__ -m64
  48
  49        KBUILD_AFLAGS += -m64
  50        KBUILD_CFLAGS += -m64
  51
  52        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  53        cflags-$(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
  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) $(KBUILD_CPPFLAGS) $(biarch)),y)
  78                stackp-y := -fstack-protector
  79                KBUILD_CFLAGS += $(stackp-y)
  80        else
  81                $(warning stack protector enabled but no compiler support)
  82        endif
  83endif
  84
  85# Don't unroll struct assignments with kmemcheck enabled
  86ifeq ($(CONFIG_KMEMCHECK),y)
  87        KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
  88endif
  89
  90# Stackpointer is addressed different for 32 bit and 64 bit x86
  91sp-$(CONFIG_X86_32) := esp
  92sp-$(CONFIG_X86_64) := rsp
  93
  94# do binutils support CFI?
  95cfi := $(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?
  97cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
  98cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
  99
 100# does binutils support specific instructions?
 101asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 102
 103KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
 104KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
 105
 106LDFLAGS := -m elf_$(UTS_MACHINE)
 107
 108# Speed up the build
 109KBUILD_CFLAGS += -pipe
 110# Workaround for a gcc prelease that unfortunately was shipped in a suse release
 111KBUILD_CFLAGS += -Wno-sign-compare
 112#
 113KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 114# prevent gcc from generating any FP code by mistake
 115KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 116
 117KBUILD_CFLAGS += $(mflags-y)
 118KBUILD_AFLAGS += $(mflags-y)
 119
 120###
 121# Syscall table generation
 122
 123archheaders:
 124        $(Q)$(MAKE) $(build)=arch/x86/syscalls all
 125
 126###
 127# Kernel objects
 128
 129head-y := arch/x86/kernel/head_$(BITS).o
 130head-y += arch/x86/kernel/head$(BITS).o
 131head-y += arch/x86/kernel/head.o
 132head-y += arch/x86/kernel/init_task.o
 133
 134libs-y  += arch/x86/lib/
 135
 136# See arch/x86/Kbuild for content of core part of the kernel
 137core-y += arch/x86/
 138
 139# drivers-y are linked after core-y
 140drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 141drivers-$(CONFIG_PCI)            += arch/x86/pci/
 142
 143# must be linked after kernel/
 144drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 145
 146# suspend and hibernation support
 147drivers-$(CONFIG_PM) += arch/x86/power/
 148
 149drivers-$(CONFIG_FB) += arch/x86/video/
 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 := $(boot)/bzImage
 165
 166bzImage: vmlinux
 167ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 168        $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 169endif
 170        $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 171        $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 172        $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 173
 174$(BOOT_TARGETS): vmlinux
 175        $(Q)$(MAKE) $(build)=$(boot) $@
 176
 177PHONY += install
 178install:
 179        $(Q)$(MAKE) $(build)=$(boot) $@
 180
 181PHONY += vdso_install
 182vdso_install:
 183        $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 184
 185archclean:
 186        $(Q)rm -rf $(objtree)/arch/i386
 187        $(Q)rm -rf $(objtree)/arch/x86_64
 188        $(Q)$(MAKE) $(clean)=$(boot)
 189
 190define archhelp
 191  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 192  echo  '  install      - Install kernel using'
 193  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 194  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 195  echo  '                  install to $$(INSTALL_PATH) and run lilo'
 196  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 197  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 198  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 199  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 200  echo  '                  bzdisk/fdimage*/isoimage also accept:'
 201  echo  '                  FDARGS="..."  arguments for the booted kernel'
 202  echo  '                  FDINITRD=file initrd for the booted kernel'
 203endef
 204