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 #
  43 # Prevent GCC from generating any FP code by mistake.
  44 #
  45 # This must happen before we try the -mpreferred-stack-boundary, see:
  46 #
  47 #    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
  48 #
  49 KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
  50 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
  51
  52 ifeq ($(CONFIG_X86_32),y)
  53         BITS := 32
  54         UTS_MACHINE := i386
  55         CHECKFLAGS += -D__i386__
  56
  57         biarch := $(call cc-option,-m32)
  58         KBUILD_AFLAGS += $(biarch)
  59         KBUILD_CFLAGS += $(biarch)
  60
  61         KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
  62
  63         # Never want PIC in a 32-bit kernel, prevent breakage with GCC built
  64         # with nonstandard options
  65         KBUILD_CFLAGS += -fno-pic
  66
  67         # prevent gcc from keeping the stack 16 byte aligned
  68         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
  69
  70         # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
  71         # a lot more stack due to the lack of sharing of stacklots:
  72         KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
  73                                 $(call cc-option,-fno-unit-at-a-time))
  74
  75         # CPU-specific tuning. Anything which can be shared with UML should go here.
  76         include arch/x86/Makefile_32.cpu
  77         KBUILD_CFLAGS += $(cflags-y)
  78
  79         # temporary until string.h is fixed
  80         KBUILD_CFLAGS += -ffreestanding
  81 else
  82         BITS := 64
  83         UTS_MACHINE := x86_64
  84         CHECKFLAGS += -D__x86_64__ -m64
  85
  86         biarch := -m64
  87         KBUILD_AFLAGS += -m64
  88         KBUILD_CFLAGS += -m64
  89
  90         # Align jump targets to 1 byte, not the default 16 bytes:
  91         KBUILD_CFLAGS += -falign-jumps=1
  92
  93         # Pack loops tightly as well:
  94         KBUILD_CFLAGS += -falign-loops=1
  95
  96         # Don't autogenerate traditional x87 instructions
  97         KBUILD_CFLAGS += $(call cc-option,-mno-80387)
  98         KBUILD_CFLAGS += $(call cc-option,-mno-fp-ret-in-387)
  99
 100         # Use -mpreferred-stack-boundary=3 if supported.
 101         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
 102
 103         # Use -mskip-rax-setup if supported.
 104         KBUILD_CFLAGS += $(call cc-option,-mskip-rax-setup)
 105
 106         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
 107         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
 108         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
 109
 110         cflags-$(CONFIG_MCORE2) += \
 111                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
 112         cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
 113                 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
 114         cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
 115         KBUILD_CFLAGS += $(cflags-y)
 116
 117         KBUILD_CFLAGS += -mno-red-zone
 118         KBUILD_CFLAGS += -mcmodel=kernel
 119
 120         # -funit-at-a-time shrinks the kernel .text considerably
 121         # unfortunately it makes reading oopses harder.
 122         KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
 123
 124         # this works around some issues with generating unwind tables in older gccs
 125         # newer gccs do it by default
 126         KBUILD_CFLAGS += $(call cc-option,-maccumulate-outgoing-args)
 127 endif
 128
 129 # Make sure compiler does not have buggy stack-protector support.
 130 ifdef CONFIG_CC_STACKPROTECTOR
 131         cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
 132         ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
 133                 $(warning stack-protector enabled but compiler support broken)
 134         endif
 135 endif
 136
 137 ifdef CONFIG_X86_X32
 138         x32_ld_ok := $(call try-run,\
 139                         /bin/echo -e '1: .quad 1b' | \
 140                         $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
 141                         $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
 142                         $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
 143         ifeq ($(x32_ld_ok),y)
 144                 CONFIG_X86_X32_ABI := y
 145                 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
 146                 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
 147         else
 148                 $(warning CONFIG_X86_X32 enabled but no binutils support)
 149         endif
 150 endif
 151 export CONFIG_X86_X32_ABI
 152
 153 # Don't unroll struct assignments with kmemcheck enabled
 154 ifeq ($(CONFIG_KMEMCHECK),y)
 155         KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
 156 endif
 157
 158 # Stackpointer is addressed different for 32 bit and 64 bit x86
 159 sp-$(CONFIG_X86_32) := esp
 160 sp-$(CONFIG_X86_64) := rsp
 161
 162 # does binutils support specific instructions?
 163 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 164 asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
 165 asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
 166 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 167 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
 168
 169 KBUILD_AFLAGS += $(asinstr) $(avx_instr) $(avx2_instr)
 170 KBUILD_CFLAGS += $(asinstr) $(avx_instr) $(avx2_instr)
 171
 172 LDFLAGS := -m elf_$(UTS_MACHINE)
 173
 174 # Speed up the build
 175 KBUILD_CFLAGS += -pipe
 176 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 177 KBUILD_CFLAGS += -Wno-sign-compare
 178 #
 179 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 180
 181 KBUILD_CFLAGS += $(mflags-y)
 182 KBUILD_AFLAGS += $(mflags-y)
 183
 184 archscripts: scripts_basic
 185         $(Q)$(MAKE) $(build)=arch/x86/tools relocs
 186
 187 ###
 188 # Syscall table generation
 189
 190 archheaders:
 191         $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
 192
 193 archprepare:
 194 ifeq ($(CONFIG_KEXEC_FILE),y)
 195         $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
 196 endif
 197
 198 ###
 199 # Kernel objects
 200
 201 head-y := arch/x86/kernel/head_$(BITS).o
 202 head-y += arch/x86/kernel/head$(BITS).o
 203 head-y += arch/x86/kernel/head.o
 204
 205 libs-y  += arch/x86/lib/
 206
 207 # See arch/x86/Kbuild for content of core part of the kernel
 208 core-y += arch/x86/
 209
 210 # drivers-y are linked after core-y
 211 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 212 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 213
 214 # must be linked after kernel/
 215 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 216
 217 # suspend and hibernation support
 218 drivers-$(CONFIG_PM) += arch/x86/power/
 219
 220 drivers-$(CONFIG_FB) += arch/x86/video/
 221
 222 drivers-$(CONFIG_RAS) += arch/x86/ras/
 223
 224 ####
 225 # boot loader support. Several targets are kept for legacy purposes
 226
 227 boot := arch/x86/boot
 228
 229 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 230
 231 PHONY += bzImage $(BOOT_TARGETS)
 232
 233 # Default kernel to build
 234 all: bzImage
 235
 236 # KBUILD_IMAGE specify target image being built
 237 KBUILD_IMAGE := $(boot)/bzImage
 238
 239 bzImage: vmlinux
 240 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 241         $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 242 endif
 243         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 244         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 245         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 246
 247 $(BOOT_TARGETS): vmlinux
 248         $(Q)$(MAKE) $(build)=$(boot) $@
 249
 250 PHONY += install
 251 install:
 252         $(Q)$(MAKE) $(build)=$(boot) $@
 253
 254 PHONY += vdso_install
 255 vdso_install:
 256         $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
 257
 258 archclean:
 259         $(Q)rm -rf $(objtree)/arch/i386
 260         $(Q)rm -rf $(objtree)/arch/x86_64
 261         $(Q)$(MAKE) $(clean)=$(boot)
 262         $(Q)$(MAKE) $(clean)=arch/x86/tools
 263         $(Q)$(MAKE) $(clean)=arch/x86/purgatory
 264
 265 define archhelp
 266   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 267   echo  '  install      - Install kernel using'
 268   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 269   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 270   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 271   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 272   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 273   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 274   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 275   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 276   echo  '                  FDARGS="..."  arguments for the booted kernel'
 277   echo  '                  FDINITRD=file initrd for the booted kernel'
 278 endef