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         KBUILD_AFLAGS += -m64
  83         KBUILD_CFLAGS += -m64
  84
  85         # Don't autogenerate MMX or SSE instructions
  86         KBUILD_CFLAGS += -mno-mmx -mno-sse
  87
  88         # Use -mpreferred-stack-boundary=3 if supported.
  89         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=3)
  90
  91         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  92         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
  93         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  94
  95         cflags-$(CONFIG_MCORE2) += \
  96                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
  97         cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
  98                 $(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
  99         cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
 100         KBUILD_CFLAGS += $(cflags-y)
 101
 102         KBUILD_CFLAGS += -mno-red-zone
 103         KBUILD_CFLAGS += -mcmodel=kernel
 104
 105         # -funit-at-a-time shrinks the kernel .text considerably
 106         # unfortunately it makes reading oopses harder.
 107         KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
 108
 109         # this works around some issues with generating unwind tables in older gccs
 110         # newer gccs do it by default
 111         KBUILD_CFLAGS += -maccumulate-outgoing-args
 112 endif
 113
 114 # Make sure compiler does not have buggy stack-protector support.
 115 ifdef CONFIG_CC_STACKPROTECTOR
 116         cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
 117         ifneq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
 118                 $(warning stack-protector enabled but compiler support broken)
 119         endif
 120 endif
 121
 122 ifdef CONFIG_X86_X32
 123         x32_ld_ok := $(call try-run,\
 124                         /bin/echo -e '1: .quad 1b' | \
 125                         $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" - && \
 126                         $(OBJCOPY) -O elf32-x86-64 "$$TMP" "$$TMPO" && \
 127                         $(LD) -m elf32_x86_64 "$$TMPO" -o "$$TMP",y,n)
 128         ifeq ($(x32_ld_ok),y)
 129                 CONFIG_X86_X32_ABI := y
 130                 KBUILD_AFLAGS += -DCONFIG_X86_X32_ABI
 131                 KBUILD_CFLAGS += -DCONFIG_X86_X32_ABI
 132         else
 133                 $(warning CONFIG_X86_X32 enabled but no binutils support)
 134         endif
 135 endif
 136 export CONFIG_X86_X32_ABI
 137
 138 # Don't unroll struct assignments with kmemcheck enabled
 139 ifeq ($(CONFIG_KMEMCHECK),y)
 140         KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
 141 endif
 142
 143 # Stackpointer is addressed different for 32 bit and 64 bit x86
 144 sp-$(CONFIG_X86_32) := esp
 145 sp-$(CONFIG_X86_64) := rsp
 146
 147 # do binutils support CFI?
 148 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
 149 # is .cfi_signal_frame supported too?
 150 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
 151 cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
 152
 153 # does binutils support specific instructions?
 154 asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
 155 avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_AVX=1)
 156 avx2_instr :=$(call as-instr,vpbroadcastb %xmm0$(comma)%ymm1,-DCONFIG_AS_AVX2=1)
 157
 158 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
 159 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr)
 160
 161 LDFLAGS := -m elf_$(UTS_MACHINE)
 162
 163 # Speed up the build
 164 KBUILD_CFLAGS += -pipe
 165 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 166 KBUILD_CFLAGS += -Wno-sign-compare
 167 #
 168 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 169 # prevent gcc from generating any FP code by mistake
 170 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 171 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 172
 173 KBUILD_CFLAGS += $(mflags-y)
 174 KBUILD_AFLAGS += $(mflags-y)
 175
 176 archscripts: scripts_basic
 177         $(Q)$(MAKE) $(build)=arch/x86/tools relocs
 178
 179 ###
 180 # Syscall table generation
 181
 182 archheaders:
 183         $(Q)$(MAKE) $(build)=arch/x86/syscalls all
 184
 185 ###
 186 # Kernel objects
 187
 188 head-y := arch/x86/kernel/head_$(BITS).o
 189 head-y += arch/x86/kernel/head$(BITS).o
 190 head-y += arch/x86/kernel/head.o
 191
 192 libs-y  += arch/x86/lib/
 193
 194 # See arch/x86/Kbuild for content of core part of the kernel
 195 core-y += arch/x86/
 196
 197 # drivers-y are linked after core-y
 198 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 199 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 200
 201 # must be linked after kernel/
 202 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 203
 204 # suspend and hibernation support
 205 drivers-$(CONFIG_PM) += arch/x86/power/
 206
 207 drivers-$(CONFIG_FB) += arch/x86/video/
 208
 209 ####
 210 # boot loader support. Several targets are kept for legacy purposes
 211
 212 boot := arch/x86/boot
 213
 214 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
 215
 216 PHONY += bzImage $(BOOT_TARGETS)
 217
 218 # Default kernel to build
 219 all: bzImage
 220
 221 # KBUILD_IMAGE specify target image being built
 222 KBUILD_IMAGE := $(boot)/bzImage
 223
 224 bzImage: vmlinux
 225 ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
 226         $(Q)$(MAKE) $(build)=arch/x86/tools posttest
 227 endif
 228         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 229         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 230         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 231
 232 $(BOOT_TARGETS): vmlinux
 233         $(Q)$(MAKE) $(build)=$(boot) $@
 234
 235 PHONY += install
 236 install:
 237         $(Q)$(MAKE) $(build)=$(boot) $@
 238
 239 PHONY += vdso_install
 240 vdso_install:
 241         $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 242
 243 archclean:
 244         $(Q)rm -rf $(objtree)/arch/i386
 245         $(Q)rm -rf $(objtree)/arch/x86_64
 246         $(Q)$(MAKE) $(clean)=$(boot)
 247         $(Q)$(MAKE) $(clean)=arch/x86/tools
 248
 249 PHONY += kvmconfig
 250 kvmconfig:
 251         $(if $(wildcard $(objtree)/.config),, $(error You need an existing .config for this target))
 252         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m -O $(objtree) $(objtree)/.config arch/x86/configs/kvm_guest.config
 253         $(Q)yes "" | $(MAKE) oldconfig
 254
 255 define archhelp
 256   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 257   echo  '  install      - Install kernel using'
 258   echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
 259   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
 260   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 261   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 262   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 263   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 264   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 265   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 266   echo  '                  FDARGS="..."  arguments for the booted kernel'
 267   echo  '                  FDINITRD=file initrd for the booted kernel'
 268   echo  '  kvmconfig    - Enable additional options for guest kernel support'
 269 endef