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 # How to compile the 16-bit code.  Note we always compile for -march=i386;
  15 # that way we can complain to the user if the CPU is insufficient.
  16 #
  17 # The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
  18 # older versions of GCC, we need to play evil and unreliable tricks to
  19 # attempt to ensure that our asm(".code16gcc") is first in the asm
  20 # output.
  21 CODE16GCC_CFLAGS := -m32 -include $(srctree)/arch/x86/boot/code16gcc.h \
  22                     $(call cc-option, -fno-toplevel-reorder,\
  23                       $(call cc-option, -fno-unit-at-a-time))
  24 M16_CFLAGS       := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
  25
  26 REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -D__KERNEL__ \
  27                    -DDISABLE_BRANCH_PROFILING \
  28                    -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
  29                    -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
  30                    -mno-mmx -mno-sse \
  31                    $(call cc-option, -ffreestanding) \
  32                    $(call cc-option, -fno-stack-protector) \
  33                    $(call cc-option, -mpreferred-stack-boundary=2)
  34 export REALMODE_CFLAGS
  35
  36 # BITS is used as extension for files which are available in a 32 bit
  37 # and a 64 bit version to simplify shared Makefiles.
  38 # e.g.: obj-y += foo_$(BITS).o
  39 export BITS
  40
  41 ifdef CONFIG_X86_NEED_RELOCS
  42         LDFLAGS_vmlinux := --emit-relocs
  43 endif
  44
  45 ifeq ($(CONFIG_X86_32),y)
  46         BITS := 32
  47         UTS_MACHINE := i386
  48         CHECKFLAGS += -D__i386__
  49
  50         biarch := $(call cc-option,-m32)
  51         KBUILD_AFLAGS += $(biarch)
  52         KBUILD_CFLAGS += $(biarch)
  53
  54         KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
  55
  56         # Don't autogenerate MMX or SSE instructions
  57         KBUILD_CFLAGS += -mno-mmx -mno-sse
  58
  59         # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
  60         # with nonstandard options
  61         KBUILD_CFLAGS += -fno-pic
  62
  63         # prevent gcc from keeping the stack 16 byte aligned
  64         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
  65
  66         # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
  67         # a lot more stack due to the lack of sharing of stacklots:
  68         KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
  69                                 $(call cc-option,-fno-unit-at-a-time))
  70
  71         # CPU-specific tuning. Anything which can be shared with UML should go here.
  72         include $(srctree)/arch/x86/Makefile_32.cpu
  73         KBUILD_CFLAGS += $(cflags-y)
  74
  75         # temporary until string.h is fixed
  76         KBUILD_CFLAGS += -ffreestanding
  77 else
  78         BITS := 64
  79         UTS_MACHINE := x86_64
  80         CHECKFLAGS += -D__x86_64__ -m64
  81
  82         biarch := -m64
  83         KBUILD_AFLAGS += -m64
  84         KBUILD_CFLAGS += -m64
  85
  86         # Don't autogenerate traditional x87, MMX or SSE instructions
  87         KBUILD_CFLAGS += -mno-mmx -mno-sse
  88         KBUILD_CFLAGS += $(call cc-option,-mno-80387)
  89         KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
  90
  91         # Use -mpreferred-stack-boundary=3 if supported.
  92         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
  93
  94         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  95         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
  96         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  97
  98         cflags-$(CONFIG_MCORE2) += \
  99                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
 100         cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
 101                 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
 102         cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
 103         KBUILD_CFLAGS += $(cflags-y)
 104
 105         KBUILD_CFLAGS += -mno-red-zone
 106         KBUILD_CFLAGS += -mcmodel=kernel
 107
 108         # -funit-at-a-time shrinks the kernel .text considerably
 109         # unfortunately it makes reading oopses harder.
 110         KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
 111
 112         # this works around some issues with generating unwind tables in older gccs
 113         # newer gccs do it by default
 114         KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args)
 115 endif
 116
 117 # Make sure compiler does not have buggy stack-protector support.
 118 ifdef CONFIG_CC_STACKPROTECTOR
 119         cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
 120         ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
 121                 $(warning stack-protector enabled but compiler support broken)
 122         endif
 123 endif
 124
 125 ifdef CONFIG_X86_X32
 126         x32_ld_ok := $(call try-run,\
 127                         /bin/echo -e '1: .quad 1b' | \
 128                         $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
 129                         $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
 130                         $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
 131         ifeq ($(x32_ld_ok),y)
 132                 CONFIG_X86_X32_ABI := y
 133                 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
 134                 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
 135         else
 136                 $(warning CONFIG_X86_X32 enabled but no binutils support)
 137         endif
 138 endif
 139 export CONFIG_X86_X32_ABI
 140
 141 # Don't unroll struct assignments with kmemcheck enabled
 142 ifeq ($(CONFIG_KMEMCHECK),y)
 143         KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
 144 endif
 145
 146 # Stackpointer is addressed different for 32 bit and 64 bit x86
 147 sp-$(CONFIG_X86_32) := esp
 148 sp-$(CONFIG_X86_64) := rsp
 149
 150 # do binutils support CFI?
 151 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
 152 # is .cfi_signal_frame supported too?
 153 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
 154 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
 155
 156 # does binutils support specific instructions?
 157 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 158 asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
 159 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 160 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
 161
 162 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
 163 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
 164
 165 LDFLAGS := -m elf_$(UTS_MACHINE)
 166
 167 # Speed up the build
 168 KBUILD_CFLAGS += -pipe
 169 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 170 KBUILD_CFLAGS += -Wno-sign-compare
 171 #
 172 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 173 # prevent gcc from generating any FP code by mistake
 174 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 175 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 176
 177 KBUILD_CFLAGS += $(mflags-y)
 178 KBUILD_AFLAGS += $(mflags-y)
 179
 180 archscripts: scripts_basic
 181         $(Q)$(MAKE) $(build)=arch/x86/tools relocs
 182
 183 ###
 184 # Syscall table generation
 185
 186 archheaders:
 187         $(Q)$(MAKE) $(build)=arch/x86/syscalls all
 188
 189 ###
 190 # Kernel objects
 191
 192 head-y := arch/x86/kernel/head_$(BITS).o
 193 head-y += arch/x86/kernel/head$(BITS).o
 194 head-y += arch/x86/kernel/head.o
 195
 196 libs-y  += arch/x86/lib/
 197
 198 # See arch/x86/Kbuild for content of core part of the kernel
 199 core-y += arch/x86/
 200
 201 # drivers-y are linked after core-y
 202 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 203 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 204
 205 # must be linked after kernel/
 206 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 207
 208 # suspend and hibernation support
 209 drivers-$(CONFIG_PM) += arch/x86/power/
 210
 211 drivers-$(CONFIG_FB) += arch/x86/video/
 212
 213 ####
 214 # boot loader support. Several targets are kept for legacy purposes
 215
 216 boot := arch/x86/boot
 217
 218 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 219
 220 PHONY += bzImage $(BOOT_TARGETS)
 221
 222 # Default kernel to build
 223 all: bzImage
 224
 225 # KBUILD_IMAGE specify target image being built
 226 KBUILD_IMAGE := $(boot)/bzImage
 227
 228 bzImage: vmlinux
 229 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 230         $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 231 endif
 232         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 233         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 234         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 235
 236 $(BOOT_TARGETS): vmlinux
 237         $(Q)$(MAKE) $(build)=$(boot) $@
 238
 239 PHONY += install
 240 install:
 241         $(Q)$(MAKE) $(build)=$(boot) $@
 242
 243 PHONY += vdso_install
 244 vdso_install:
 245         $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 246
 247 archclean:
 248         $(Q)rm -rf $(objtree)/arch/i386
 249         $(Q)rm -rf $(objtree)/arch/x86_64
 250         $(Q)$(MAKE) $(clean)=$(boot)
 251         $(Q)$(MAKE) $(clean)=arch/x86/tools
 252
 253 PHONY += kvmconfig
 254 kvmconfig:
 255         $(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
 256         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config $(srctree)/arch/x86/configs/kvm_guest.config
 257         $(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
 258
 259 define archhelp
 260   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 261   echo  '  install      - Install kernel using'
 262   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 263   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 264   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 265   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 266   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 267   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 268   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 269   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 270   echo  '                  FDARGS="..."  arguments for the booted kernel'
 271   echo  '                  FDINITRD=file initrd for the booted kernel'
 272   echo  '  kvmconfig    - Enable additional options for guest kernel support'
 273 endef