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 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 #
 147 # If the function graph tracer is used with mcount instead of fentry,
 148 # '-maccumulate-outgoing-args' is needed to prevent a GCC bug
 149 # (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=42109)
 150 #
 151 ifdef CONFIG_FUNCTION_GRAPH_TRACER
 152   ifndef CONFIG_HAVE_FENTRY
 153         ACCUMULATE_OUTGOING_ARGS := 1
 154   else
 155     ifeq ($(call cc-option-yn, -mfentry), n)
 156         ACCUMULATE_OUTGOING_ARGS := 1
 157
 158         # GCC ignores '-maccumulate-outgoing-args' when used with '-Os'.
 159         # If '-Os' is enabled, disable it and print a warning.
 160         ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 161           undefine CONFIG_CC_OPTIMIZE_FOR_SIZE
 162           $(warning Disabling CONFIG_CC_OPTIMIZE_FOR_SIZE.  Your compiler does not have -mfentry so you cannot optimize for size with CONFIG_FUNCTION_GRAPH_TRACER.)
 163         endif
 164
 165     endif
 166   endif
 167 endif
 168
 169 #
 170 # Jump labels need '-maccumulate-outgoing-args' for gcc < 4.5.2 to prevent a
 171 # GCC bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46226).  There's no way
 172 # to test for this bug at compile-time because the test case needs to execute,
 173 # which is a no-go for cross compilers.  So check the GCC version instead.
 174 #
 175 ifdef CONFIG_JUMP_LABEL
 176   ifneq ($(ACCUMULATE_OUTGOING_ARGS), 1)
 177         ACCUMULATE_OUTGOING_ARGS = $(call cc-if-fullversion, -lt, 040502, 1)
 178   endif
 179 endif
 180
 181 ifeq ($(ACCUMULATE_OUTGOING_ARGS), 1)
 182         KBUILD_CFLAGS += -maccumulate-outgoing-args
 183 endif
 184
 185 # Stackpointer is addressed different for 32 bit and 64 bit x86
 186 sp-$(CONFIG_X86_32) := esp
 187 sp-$(CONFIG_X86_64) := rsp
 188
 189 # do binutils support CFI?
 190 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
 191 # is .cfi_signal_frame supported too?
 192 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
 193 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
 194
 195 # does binutils support specific instructions?
 196 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 197 asinstr += $(call as-instr,pshufb %xmm0$(comma)%xmm0,-DCONFIG_AS_SSSE3=1)
 198 asinstr += $(call as-instr,crc32l %eax$(comma)%eax,-DCONFIG_AS_CRC32=1)
 199 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 200 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
 201 avx512_instr :=$(call as-instr,vpmovm2b %k1$(comma)%zmm5,-DCONFIG_AS_AVX512=1)
 202 sha1_ni_instr :=$(call as-instr,sha1msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA1_NI=1)
 203 sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA256_NI=1)
 204
 205 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
 206 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
 207
 208 LDFLAGS := -m elf_$(UTS_MACHINE)
 209
 210 # Speed up the build
 211 KBUILD_CFLAGS += -pipe
 212 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 213 KBUILD_CFLAGS += -Wno-sign-compare
 214 #
 215 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 216
 217 KBUILD_CFLAGS += $(mflags-y)
 218 KBUILD_AFLAGS += $(mflags-y)
 219
 220 archscripts: scripts_basic
 221         $(Q)$(MAKE) $(build)=arch/x86/tools relocs
 222
 223 ###
 224 # Syscall table generation
 225
 226 archheaders:
 227         $(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
 228
 229 archprepare:
 230 ifeq ($(CONFIG_KEXEC_FILE),y)
 231         $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
 232 endif
 233
 234 ###
 235 # Kernel objects
 236
 237 head-y := arch/x86/kernel/head_$(BITS).o
 238 head-y += arch/x86/kernel/head$(BITS).o
 239 head-y += arch/x86/kernel/ebda.o
 240 head-y += arch/x86/kernel/platform-quirks.o
 241
 242 libs-y  += arch/x86/lib/
 243
 244 # See arch/x86/Kbuild for content of core part of the kernel
 245 core-y += arch/x86/
 246
 247 # drivers-y are linked after core-y
 248 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 249 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 250
 251 # must be linked after kernel/
 252 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 253
 254 # suspend and hibernation support
 255 drivers-$(CONFIG_PM) += arch/x86/power/
 256
 257 drivers-$(CONFIG_FB) += arch/x86/video/
 258
 259 drivers-$(CONFIG_RAS) += arch/x86/ras/
 260
 261 ####
 262 # boot loader support. Several targets are kept for legacy purposes
 263
 264 boot := arch/x86/boot
 265
 266 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 267
 268 PHONY += bzImage $(BOOT_TARGETS)
 269
 270 # Default kernel to build
 271 all: bzImage
 272
 273 # KBUILD_IMAGE specify target image being built
 274 KBUILD_IMAGE := $(boot)/bzImage
 275
 276 bzImage: vmlinux
 277 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 278         $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 279 endif
 280         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 281         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 282         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 283
 284 $(BOOT_TARGETS): vmlinux
 285         $(Q)$(MAKE) $(build)=$(boot) $@
 286
 287 PHONY += install
 288 install:
 289         $(Q)$(MAKE) $(build)=$(boot) $@
 290
 291 PHONY += vdso_install
 292 vdso_install:
 293         $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@
 294
 295 archclean:
 296         $(Q)rm -rf $(objtree)/arch/i386
 297         $(Q)rm -rf $(objtree)/arch/x86_64
 298         $(Q)$(MAKE) $(clean)=$(boot)
 299         $(Q)$(MAKE) $(clean)=arch/x86/tools
 300         $(Q)$(MAKE) $(clean)=arch/x86/purgatory
 301
 302 define archhelp
 303   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 304   echo  '  install      - Install kernel using'
 305   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 306   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 307   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 308   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 309   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 310   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 311   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 312   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 313   echo  '                  FDARGS="..."  arguments for the booted kernel'
 314   echo  '                  FDINITRD=file initrd for the booted kernel'
 315 endef