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        # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
  31        # with nonstandard options
  32        KBUILD_CFLAGS += -fno-pic
  33
  34        # prevent gcc from keeping the stack 16 byte aligned
  35        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
  36
  37        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
  38        # a lot more stack due to the lack of sharing of stacklots:
  39        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
  40                                $(call cc-option,-fno-unit-at-a-time))
  41
  42        # CPU-specific tuning. Anything which can be shared with UML should go here.
  43        include $(srctree)/arch/x86/Makefile_32.cpu
  44        KBUILD_CFLAGS += $(cflags-y)
  45
  46        # temporary until string.h is fixed
  47        KBUILD_CFLAGS += -ffreestanding
  48else
  49        BITS := 64
  50        UTS_MACHINE := x86_64
  51        CHECKFLAGS += -D__x86_64__ -m64
  52
  53        KBUILD_AFLAGS += -m64
  54        KBUILD_CFLAGS += -m64
  55
  56        # Use -mpreferred-stack-boundary=3 if supported.
  57        KBUILD_CFLAGS += $(call cc-option,-mno-sse -mpreferred-stack-boundary=3)
  58
  59        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  60        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
  61        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  62
  63        cflags-$(CONFIG_MCORE2) += \
  64                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
  65        cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
  66                $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
  67        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
  68        KBUILD_CFLAGS += $(cflags-y)
  69
  70        KBUILD_CFLAGS += -mno-red-zone
  71        KBUILD_CFLAGS += -mcmodel=kernel
  72
  73        # -funit-at-a-time shrinks the kernel .text considerably
  74        # unfortunately it makes reading oopses harder.
  75        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
  76
  77        # this works around some issues with generating unwind tables in older gccs
  78        # newer gccs do it by default
  79        KBUILD_CFLAGS += -maccumulate-outgoing-args
  80endif
  81
  82ifdef CONFIG_CC_STACKPROTECTOR
  83        cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
  84        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
  85                stackp-y := -fstack-protector
  86                KBUILD_CFLAGS += $(stackp-y)
  87        else
  88                $(warning stack protector enabled but no compiler support)
  89        endif
  90endif
  91
  92ifdef CONFIG_X86_X32
  93        x32_ld_ok := $(call try-run,\
  94                        /bin/echo -e '1: .quad 1b' | \
  95                        $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
  96                        $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
  97                        $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
  98        ifeq ($(x32_ld_ok),y)
  99                CONFIG_X86_X32_ABI := y
 100                KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
 101                KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
 102        else
 103                $(warning CONFIG_X86_X32 enabled but no binutils support)
 104        endif
 105endif
 106export CONFIG_X86_X32_ABI
 107
 108# Don't unroll struct assignments with kmemcheck enabled
 109ifeq ($(CONFIG_KMEMCHECK),y)
 110        KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
 111endif
 112
 113# Stackpointer is addressed different for 32 bit and 64 bit x86
 114sp-$(CONFIG_X86_32) := esp
 115sp-$(CONFIG_X86_64) := rsp
 116
 117# do binutils support CFI?
 118cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
 119# is .cfi_signal_frame supported too?
 120cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
 121cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
 122
 123# does binutils support specific instructions?
 124asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 125avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 126
 127KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
 128KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
 129
 130LDFLAGS := -m elf_$(UTS_MACHINE)
 131
 132# Speed up the build
 133KBUILD_CFLAGS += -pipe
 134# Workaround for a gcc prelease that unfortunately was shipped in a suse release
 135KBUILD_CFLAGS += -Wno-sign-compare
 136#
 137KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 138# prevent gcc from generating any FP code by mistake
 139KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 140KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 141
 142KBUILD_CFLAGS += $(mflags-y)
 143KBUILD_AFLAGS += $(mflags-y)
 144
 145archscripts: scripts_basic
 146        $(Q)$(MAKE) $(build)=arch/x86/tools relocs
 147
 148###
 149# Syscall table generation
 150
 151archheaders:
 152        $(Q)$(MAKE) $(build)=arch/x86/syscalls all
 153
 154###
 155# Kernel objects
 156
 157head-y := arch/x86/kernel/head_$(BITS).o
 158head-y += arch/x86/kernel/head$(BITS).o
 159head-y += arch/x86/kernel/head.o
 160
 161libs-y  += arch/x86/lib/
 162
 163# See arch/x86/Kbuild for content of core part of the kernel
 164core-y += arch/x86/
 165
 166# drivers-y are linked after core-y
 167drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 168drivers-$(CONFIG_PCI)            += arch/x86/pci/
 169
 170# must be linked after kernel/
 171drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 172
 173# suspend and hibernation support
 174drivers-$(CONFIG_PM) += arch/x86/power/
 175
 176drivers-$(CONFIG_FB) += arch/x86/video/
 177
 178####
 179# boot loader support. Several targets are kept for legacy purposes
 180
 181boot := arch/x86/boot
 182
 183BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 184
 185PHONY += bzImage $(BOOT_TARGETS)
 186
 187# Default kernel to build
 188all: bzImage
 189
 190# KBUILD_IMAGE specify target image being built
 191KBUILD_IMAGE := $(boot)/bzImage
 192
 193bzImage: vmlinux
 194ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 195        $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 196endif
 197        $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 198        $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 199        $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 200
 201$(BOOT_TARGETS): vmlinux
 202        $(Q)$(MAKE) $(build)=$(boot) $@
 203
 204PHONY += install
 205install:
 206        $(Q)$(MAKE) $(build)=$(boot) $@
 207
 208PHONY += vdso_install
 209vdso_install:
 210        $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 211
 212archclean:
 213        $(Q)rm -rf $(objtree)/arch/i386
 214        $(Q)rm -rf $(objtree)/arch/x86_64
 215        $(Q)$(MAKE) $(clean)=$(boot)
 216        $(Q)$(MAKE) $(clean)=arch/x86/tools
 217
 218define archhelp
 219  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 220  echo  '  install      - Install kernel using'
 221  echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 222  echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 223  echo  '                  install to $$(INSTALL_PATH) and run lilo'
 224  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 225  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 226  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 227  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 228  echo  '                  bzdisk/fdimage*/isoimage also accept:'
 229  echo  '                  FDARGS="..."  arguments for the booted kernel'
 230  echo  '                  FDINITRD=file initrd for the booted kernel'
 231endef
 232
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