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 := $(ARCH)_defconfig
  12 endif
  13
  14 # How to compile the 16-bit code.  Note we always compile for -march=i386;
  15 # that way we can complain to the user if the CPU is insufficient.
  16 #
  17 # The -m16 option is supported by GCC >= 4.9 and clang >= 3.5. For
  18 # older versions of GCC, include an *assembly* header to make sure that
  19 # gcc doesn't play any games behind our back.
  20 CODE16GCC_CFLAGS := -m32 -Wa,$(srctree)/arch/x86/boot/code16gcc.h
  21 M16_CFLAGS       := $(call cc-option, -m16, $(CODE16GCC_CFLAGS))
  22
  23 REALMODE_CFLAGS := $(M16_CFLAGS) -g -Os -D__KERNEL__ \
  24                    -DDISABLE_BRANCH_PROFILING \
  25                    -Wall -Wstrict-prototypes -march=i386 -mregparm=3 \
  26                    -fno-strict-aliasing -fomit-frame-pointer -fno-pic \
  27                    -mno-mmx -mno-sse \
  28                    $(call cc-option, -ffreestanding) \
  29                    $(call cc-option, -fno-stack-protector) \
  30                    $(call cc-option, -mpreferred-stack-boundary=2)
  31 export REALMODE_CFLAGS
  32
  33 # BITS is used as extension for files which are available in a 32 bit
  34 # and a 64 bit version to simplify shared Makefiles.
  35 # e.g.: obj-y += foo_$(BITS).o
  36 export BITS
  37
  38 ifdef CONFIG_X86_NEED_RELOCS
  39         LDFLAGS_vmlinux := --emit-relocs
  40 endif
  41
  42 ifeq ($(CONFIG_X86_32),y)
  43         BITS := 32
  44         UTS_MACHINE := i386
  45         CHECKFLAGS += -D__i386__
  46
  47         biarch := $(call cc-option,-m32)
  48         KBUILD_AFLAGS += $(biarch)
  49         KBUILD_CFLAGS += $(biarch)
  50
  51         KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
  52
  53         # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
  54         # with nonstandard options
  55         KBUILD_CFLAGS += -fno-pic
  56
  57         # prevent gcc from keeping the stack 16 byte aligned
  58         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
  59
  60         # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
  61         # a lot more stack due to the lack of sharing of stacklots:
  62         KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
  63                                 $(call cc-option,-fno-unit-at-a-time))
  64
  65         # CPU-specific tuning. Anything which can be shared with UML should go here.
  66         include arch/x86/Makefile_32.cpu
  67         KBUILD_CFLAGS += $(cflags-y)
  68
  69         # temporary until string.h is fixed
  70         KBUILD_CFLAGS += -ffreestanding
  71 else
  72         BITS := 64
  73         UTS_MACHINE := x86_64
  74         CHECKFLAGS += -D__x86_64__ -m64
  75
  76         biarch := -m64
  77         KBUILD_AFLAGS += -m64
  78         KBUILD_CFLAGS += -m64
  79
  80         # Align jump targets to 1 byte, not the default 16 bytes:
  81         KBUILD_CFLAGS += -falign-jumps=1
  82
  83         # Pack loops tightly as well:
  84         KBUILD_CFLAGS += -falign-loops=1
  85
  86         # Don't autogenerate traditional x87 instructions
  87         KBUILD_CFLAGS += $(call cc-option,-mno-80387)
  88         KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
  89
  90         # Use -mpreferred-stack-boundary=3 if supported.
  91         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
  92
  93         # Use -mskip-rax-setup if supported.
  94         KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
  95
  96         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  97         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
  98         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  99
 100         cflags-$(CONFIG_MCORE2) += \
 101                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
 102         cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
 103                 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
 104         cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
 105         KBUILD_CFLAGS += $(cflags-y)
 106
 107         KBUILD_CFLAGS += -mno-red-zone
 108         KBUILD_CFLAGS += -mcmodel=kernel
 109
 110         # -funit-at-a-time shrinks the kernel .text considerably
 111         # unfortunately it makes reading oopses harder.
 112         KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
 113
 114         # this works around some issues with generating unwind tables in older gccs
 115         # newer gccs do it by default
 116         KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args)
 117 endif
 118
 119 # Make sure compiler does not have buggy stack-protector support.
 120 ifdef CONFIG_CC_STACKPROTECTOR
 121         cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
 122         ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
 123                 $(warning stack-protector enabled but compiler support broken)
 124         endif
 125 endif
 126
 127 ifdef CONFIG_X86_X32
 128         x32_ld_ok := $(call try-run,\
 129                         /bin/echo -e '1: .quad 1b' | \
 130                         $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
 131                         $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
 132                         $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
 133         ifeq ($(x32_ld_ok),y)
 134                 CONFIG_X86_X32_ABI := y
 135                 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
 136                 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
 137         else
 138                 $(warning CONFIG_X86_X32 enabled but no binutils support)
 139         endif
 140 endif
 141 export CONFIG_X86_X32_ABI
 142
 143 # Don't unroll struct assignments with kmemcheck enabled
 144 ifeq ($(CONFIG_KMEMCHECK),y)
 145         KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
 146 endif
 147
 148 # Stackpointer is addressed different for 32 bit and 64 bit x86
 149 sp-$(CONFIG_X86_32) := esp
 150 sp-$(CONFIG_X86_64) := rsp
 151
 152 # does binutils support specific instructions?
 153 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 154 asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
 155 asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
 156 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 157 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
 158
 159 KBUILD_AFLAGS += $(asinstr) $(avx_instr) $(avx2_instr)
 160 KBUILD_CFLAGS += $(asinstr) $(avx_instr) $(avx2_instr)
 161
 162 LDFLAGS := -m elf_$(UTS_MACHINE)
 163
 164 # Speed up the build
 165 KBUILD_CFLAGS += -pipe
 166 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 167 KBUILD_CFLAGS += -Wno-sign-compare
 168 #
 169 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 170 # prevent gcc from generating any FP code by mistake
 171 KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
 172 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 173
 174 KBUILD_CFLAGS += $(mflags-y)
 175 KBUILD_AFLAGS += $(mflags-y)
 176
 177 archscripts: scripts_basic
 178         $(Q)$(MAKE) $(build)=arch/x86/tools relocs
 179
 180 ###
 181 # Syscall table generation
 182
 183 archheaders:
 184         $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
 185
 186 archprepare:
 187 ifeq ($(CONFIG_KEXEC_FILE),y)
 188         $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
 189 endif
 190
 191 ###
 192 # Kernel objects
 193
 194 head-y := arch/x86/kernel/head_$(BITS).o
 195 head-y += arch/x86/kernel/head$(BITS).o
 196 head-y += arch/x86/kernel/head.o
 197
 198 libs-y  += arch/x86/lib/
 199
 200 # See arch/x86/Kbuild for content of core part of the kernel
 201 core-y += arch/x86/
 202
 203 # drivers-y are linked after core-y
 204 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 205 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 206
 207 # must be linked after kernel/
 208 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 209
 210 # suspend and hibernation support
 211 drivers-$(CONFIG_PM) += arch/x86/power/
 212
 213 drivers-$(CONFIG_FB) += arch/x86/video/
 214
 215 ####
 216 # boot loader support. Several targets are kept for legacy purposes
 217
 218 boot := arch/x86/boot
 219
 220 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 221
 222 PHONY += bzImage $(BOOT_TARGETS)
 223
 224 # Default kernel to build
 225 all: bzImage
 226
 227 # KBUILD_IMAGE specify target image being built
 228 KBUILD_IMAGE := $(boot)/bzImage
 229
 230 bzImage: vmlinux
 231 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 232         $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 233 endif
 234         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 235         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 236         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 237
 238 $(BOOT_TARGETS): vmlinux
 239         $(Q)$(MAKE) $(build)=$(boot) $@
 240
 241 PHONY += install
 242 install:
 243         $(Q)$(MAKE) $(build)=$(boot) $@
 244
 245 PHONY += vdso_install
 246 vdso_install:
 247         $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
 248
 249 archclean:
 250         $(Q)rm -rf $(objtree)/arch/i386
 251         $(Q)rm -rf $(objtree)/arch/x86_64
 252         $(Q)$(MAKE) $(clean)=$(boot)
 253         $(Q)$(MAKE) $(clean)=arch/x86/tools
 254         $(Q)$(MAKE) $(clean)=arch/x86/purgatory
 255
 256 define archhelp
 257   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 258   echo  '  install      - Install kernel using'
 259   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 260   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 261   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 262   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 263   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 264   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 265   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 266   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 267   echo  '                  FDARGS="..."  arguments for the booted kernel'
 268   echo  '                  FDINITRD=file initrd for the booted kernel'
 269 endef