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         # Use -mpreferred-stack-boundary=3 if supported.
  53         KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3)
  54
  55         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  56         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
  57         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  58
  59         cflags-$(CONFIG_MCORE2) += \
  60                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
  61         cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
  62                 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
  63         cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
  64         KBUILD_CFLAGS += $(cflags-y)
  65
  66         KBUILD_CFLAGS += -mno-red-zone
  67         KBUILD_CFLAGS += -mcmodel=kernel
  68
  69         # -funit-at-a-time shrinks the kernel .text considerably
  70         # unfortunately it makes reading oopses harder.
  71         KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
  72
  73         # this works around some issues with generating unwind tables in older gccs
  74         # newer gccs do it by default
  75         KBUILD_CFLAGS += -maccumulate-outgoing-args
  76 endif
  77
  78 ifdef CONFIG_CC_STACKPROTECTOR
  79         cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
  80         ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
  81                 stackp-y := -fstack-protector
  82                 KBUILD_CFLAGS += $(stackp-y)
  83         else
  84                 $(warning stack protector enabled but no compiler support)
  85         endif
  86 endif
  87
  88 ifdef CONFIG_X86_X32
  89         x32_ld_ok := $(call try-run,\
  90                         /bin/echo -e '1: .quad 1b' | \
  91                         $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" - && \
  92                         $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
  93                         $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
  94         ifeq ($(x32_ld_ok),y)
  95                 CONFIG_X86_X32_ABI := y
  96                 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
  97                 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
  98         else
  99                 $(warning CONFIG_X86_X32 enabled but no binutils support)
 100         endif
 101 endif
 102 export CONFIG_X86_X32_ABI
 103
 104 # Don't unroll struct assignments with kmemcheck enabled
 105 ifeq ($(CONFIG_KMEMCHECK),y)
 106         KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
 107 endif
 108
 109 # Stackpointer is addressed different for 32 bit and 64 bit x86
 110 sp-$(CONFIG_X86_32) := esp
 111 sp-$(CONFIG_X86_64) := rsp
 112
 113 # do binutils support CFI?
 114 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
 115 # is .cfi_signal_frame supported too?
 116 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
 117 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
 118
 119 # does binutils support specific instructions?
 120 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 121 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 122
 123 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
 124 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
 125
 126 LDFLAGS := -m elf_$(UTS_MACHINE)
 127
 128 # Speed up the build
 129 KBUILD_CFLAGS += -pipe
 130 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 131 KBUILD_CFLAGS += -Wno-sign-compare
 132 #
 133 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 134 # prevent gcc from generating any FP code by mistake
 135 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 136 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 137
 138 KBUILD_CFLAGS += $(mflags-y)
 139 KBUILD_AFLAGS += $(mflags-y)
 140
 141 archscripts:
 142         $(Q)$(MAKE) $(build)=arch/x86/tools relocs
 143
 144 ###
 145 # Syscall table generation
 146
 147 archheaders:
 148         $(Q)$(MAKE) $(build)=arch/x86/syscalls all
 149
 150 ###
 151 # Kernel objects
 152
 153 head-y := arch/x86/kernel/head_$(BITS).o
 154 head-y += arch/x86/kernel/head$(BITS).o
 155 head-y += arch/x86/kernel/head.o
 156
 157 libs-y  += arch/x86/lib/
 158
 159 # See arch/x86/Kbuild for content of core part of the kernel
 160 core-y += arch/x86/
 161
 162 # drivers-y are linked after core-y
 163 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 164 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 165
 166 # must be linked after kernel/
 167 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 168
 169 # suspend and hibernation support
 170 drivers-$(CONFIG_PM) += arch/x86/power/
 171
 172 drivers-$(CONFIG_FB) += arch/x86/video/
 173
 174 ####
 175 # boot loader support. Several targets are kept for legacy purposes
 176
 177 boot := arch/x86/boot
 178
 179 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 180
 181 PHONY += bzImage $(BOOT_TARGETS)
 182
 183 # Default kernel to build
 184 all: bzImage
 185
 186 # KBUILD_IMAGE specify target image being built
 187 KBUILD_IMAGE := $(boot)/bzImage
 188
 189 bzImage: vmlinux
 190 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 191         $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 192 endif
 193         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 194         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 195         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 196
 197 $(BOOT_TARGETS): vmlinux
 198         $(Q)$(MAKE) $(build)=$(boot) $@
 199
 200 PHONY += install
 201 install:
 202         $(Q)$(MAKE) $(build)=$(boot) $@
 203
 204 PHONY += vdso_install
 205 vdso_install:
 206         $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 207
 208 archclean:
 209         $(Q)rm -rf $(objtree)/arch/i386
 210         $(Q)rm -rf $(objtree)/arch/x86_64
 211         $(Q)$(MAKE) $(clean)=$(boot)
 212         $(Q)$(MAKE) $(clean)=arch/x86/tools
 213
 214 define archhelp
 215   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 216   echo  '  install      - Install kernel using'
 217   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 218   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 219   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 220   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 221   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 222   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 223   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 224   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 225   echo  '                  FDARGS="..."  arguments for the booted kernel'
 226   echo  '                  FDINITRD=file initrd for the booted kernel'
 227 endef