arch/x86/Makefile

   1 # Unified Makefile for i386 and x86_64
   2
   3 # select defconfig based on actual architecture
   4 ifeq ($(ARCH),x86)
   5   ifeq ($(shell uname -m),x86_64)
   6         KBUILD_DEFCONFIG := x86_64_defconfig
   7   else
   8         KBUILD_DEFCONFIG := i386_defconfig
   9   endif
  10 else
  11         KBUILD_DEFCONFIG := $(ARCH)_defconfig
  12 endif
  13
  14 # BITS is used as extension for files which are available in a 32 bit
  15 # and a 64 bit version to simplify shared Makefiles.
  16 # e.g.: obj-y += foo_$(BITS).o
  17 export BITS
  18
  19 ifeq ($(CONFIG_X86_32),y)
  20         BITS := 32
  21         UTS_MACHINE := i386
  22         CHECKFLAGS += -D__i386__
  23
  24         biarch := $(call cc-option,-m32)
  25         KBUILD_AFLAGS += $(biarch)
  26         KBUILD_CFLAGS += $(biarch)
  27
  28         ifdef CONFIG_RELOCATABLE
  29                 LDFLAGS_vmlinux := --emit-relocs
  30         endif
  31
  32         KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
  33
  34         # Don't autogenerate MMX or SSE instructions
  35         KBUILD_CFLAGS += -mno-mmx -mno-sse
  36
  37         # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
  38         # with nonstandard options
  39         KBUILD_CFLAGS += -fno-pic
  40
  41         # prevent gcc from keeping the stack 16 byte aligned
  42         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
  43
  44         # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
  45         # a lot more stack due to the lack of sharing of stacklots:
  46         KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
  47                                 $(call cc-option,-fno-unit-at-a-time))
  48
  49         # CPU-specific tuning. Anything which can be shared with UML should go here.
  50         include $(srctree)/arch/x86/Makefile_32.cpu
  51         KBUILD_CFLAGS += $(cflags-y)
  52
  53         # temporary until string.h is fixed
  54         KBUILD_CFLAGS += -ffreestanding
  55 else
  56         BITS := 64
  57         UTS_MACHINE := x86_64
  58         CHECKFLAGS += -D__x86_64__ -m64
  59
  60         KBUILD_AFLAGS += -m64
  61         KBUILD_CFLAGS += -m64
  62
  63         # Don't autogenerate MMX or SSE instructions
  64         KBUILD_CFLAGS += -mno-mmx -mno-sse
  65
  66         # Use -mpreferred-stack-boundary=3 if supported.
  67         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
  68
  69         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  70         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
  71         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  72
  73         cflags-$(CONFIG_MCORE2) += \
  74                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
  75         cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
  76                 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
  77         cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
  78         KBUILD_CFLAGS += $(cflags-y)
  79
  80         KBUILD_CFLAGS += -mno-red-zone
  81         KBUILD_CFLAGS += -mcmodel=kernel
  82
  83         # -funit-at-a-time shrinks the kernel .text considerably
  84         # unfortunately it makes reading oopses harder.
  85         KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
  86
  87         # this works around some issues with generating unwind tables in older gccs
  88         # newer gccs do it by default
  89         KBUILD_CFLAGS += -maccumulate-outgoing-args
  90 endif
  91
  92 ifdef CONFIG_CC_STACKPROTECTOR
  93         cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
  94         ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
  95                 stackp-y := -fstack-protector
  96                 KBUILD_CFLAGS += $(stackp-y)
  97         else
  98                 $(warning stack protector enabled but no compiler support)
  99         endif
 100 endif
 101
 102 ifdef CONFIG_X86_X32
 103         x32_ld_ok := $(call try-run,\
 104                         /bin/echo -e '1: .quad 1b' | \
 105                         $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
 106                         $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
 107                         $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
 108         ifeq ($(x32_ld_ok),y)
 109                 CONFIG_X86_X32_ABI := y
 110                 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
 111                 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
 112         else
 113                 $(warning CONFIG_X86_X32 enabled but no binutils support)
 114         endif
 115 endif
 116 export CONFIG_X86_X32_ABI
 117
 118 # Don't unroll struct assignments with kmemcheck enabled
 119 ifeq ($(CONFIG_KMEMCHECK),y)
 120         KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
 121 endif
 122
 123 # Stackpointer is addressed different for 32 bit and 64 bit x86
 124 sp-$(CONFIG_X86_32) := esp
 125 sp-$(CONFIG_X86_64) := rsp
 126
 127 # do binutils support CFI?
 128 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
 129 # is .cfi_signal_frame supported too?
 130 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
 131 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
 132
 133 # does binutils support specific instructions?
 134 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 135 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 136 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
 137
 138 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
 139 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
 140
 141 LDFLAGS := -m elf_$(UTS_MACHINE)
 142
 143 # Speed up the build
 144 KBUILD_CFLAGS += -pipe
 145 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 146 KBUILD_CFLAGS += -Wno-sign-compare
 147 #
 148 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 149 # prevent gcc from generating any FP code by mistake
 150 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 151 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 152
 153 KBUILD_CFLAGS += $(mflags-y)
 154 KBUILD_AFLAGS += $(mflags-y)
 155
 156 archscripts: scripts_basic
 157         $(Q)$(MAKE) $(build)=arch/x86/tools relocs
 158
 159 ###
 160 # Syscall table generation
 161
 162 archheaders:
 163         $(Q)$(MAKE) $(build)=arch/x86/syscalls all
 164
 165 ###
 166 # Kernel objects
 167
 168 head-y := arch/x86/kernel/head_$(BITS).o
 169 head-y += arch/x86/kernel/head$(BITS).o
 170 head-y += arch/x86/kernel/head.o
 171
 172 libs-y  += arch/x86/lib/
 173
 174 # See arch/x86/Kbuild for content of core part of the kernel
 175 core-y += arch/x86/
 176
 177 # drivers-y are linked after core-y
 178 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 179 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 180
 181 # must be linked after kernel/
 182 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 183
 184 # suspend and hibernation support
 185 drivers-$(CONFIG_PM) += arch/x86/power/
 186
 187 drivers-$(CONFIG_FB) += arch/x86/video/
 188
 189 ####
 190 # boot loader support. Several targets are kept for legacy purposes
 191
 192 boot := arch/x86/boot
 193
 194 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 195
 196 PHONY += bzImage $(BOOT_TARGETS)
 197
 198 # Default kernel to build
 199 all: bzImage
 200
 201 # KBUILD_IMAGE specify target image being built
 202 KBUILD_IMAGE := $(boot)/bzImage
 203
 204 bzImage: vmlinux
 205 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 206         $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 207 endif
 208         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 209         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 210         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 211
 212 $(BOOT_TARGETS): vmlinux
 213         $(Q)$(MAKE) $(build)=$(boot) $@
 214
 215 PHONY += install
 216 install:
 217         $(Q)$(MAKE) $(build)=$(boot) $@
 218
 219 PHONY += vdso_install
 220 vdso_install:
 221         $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 222
 223 archclean:
 224         $(Q)rm -rf $(objtree)/arch/i386
 225         $(Q)rm -rf $(objtree)/arch/x86_64
 226         $(Q)$(MAKE) $(clean)=$(boot)
 227         $(Q)$(MAKE) $(clean)=arch/x86/tools
 228
 229 define archhelp
 230   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 231   echo  '  install      - Install kernel using'
 232   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 233   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 234   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 235   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 236   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 237   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 238   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 239   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 240   echo  '                  FDARGS="..."  arguments for the booted kernel'
 241   echo  '                  FDINITRD=file initrd for the booted kernel'
 242 endef