arch/arm64/Makefile

   1 #
   2 # arch/arm64/Makefile
   3 #
   4 # This file is included by the global makefile so that you can add your own
   5 # architecture-specific flags and dependencies.
   6 #
   7 # This file is subject to the terms and conditions of the GNU General Public
   8 # License.  See the file "COPYING" in the main directory of this archive
   9 # for more details.
  10 #
  11 # Copyright (C) 1995-2001 by Russell King
  12
  13 LDFLAGS_vmlinux :=-p --no-undefined -X
  14 CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
  15 OBJCOPYFLAGS    :=-O binary -R .note -R .note.gnu.build-id -R .comment -S
  16 GZFLAGS         :=-9
  17
  18 ifneq ($(CONFIG_RELOCATABLE),)
  19 LDFLAGS_vmlinux         += -pie -Bsymbolic
  20 endif
  21
  22 KBUILD_DEFCONFIG := defconfig
  23
  24 # Check for binutils support for specific extensions
  25 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
  26
  27 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
  28   ifeq ($(lseinstr),)
  29 $(warning LSE atomics not supported by binutils)
  30   endif
  31 endif
  32
  33 ifeq ($(cc-name),clang)
  34 # This is a workaround for https://bugs.llvm.org/show_bug.cgi?id=30792.
  35 # TODO: revert when this is fixed in LLVM.
  36 KBUILD_CFLAGS   += -mno-implicit-float
  37 else
  38 KBUILD_CFLAGS   += -mgeneral-regs-only
  39 endif
  40 KBUILD_CFLAGS   += $(lseinstr)
  41 KBUILD_CFLAGS   += -fno-pic
  42 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  43 KBUILD_CFLAGS   += $(call cc-option, -mpc-relative-literal-loads)
  44 KBUILD_AFLAGS   += $(lseinstr)
  45
  46 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  47 KBUILD_CPPFLAGS += -mbig-endian
  48 AS              += -EB
  49 LD              += -EB
  50 else
  51 KBUILD_CPPFLAGS += -mlittle-endian
  52 AS              += -EL
  53 LD              += -EL
  54 endif
  55
  56 CHECKFLAGS      += -D__aarch64__
  57
  58 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
  59 KBUILD_CFLAGS_MODULE    += -mcmodel=large
  60 endif
  61
  62 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  63 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  64 endif
  65
  66 # Default value
  67 head-y          := arch/arm64/kernel/head.o
  68
  69 # The byte offset of the kernel image in RAM from the start of RAM.
  70 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  71 TEXT_OFFSET := $(shell awk 'BEGIN {srand(); printf "0x%03x000\n", int(512 * rand())}')
  72 else
  73 TEXT_OFFSET := 0x00080000
  74 endif
  75
  76 ifeq ($(cc-name),clang)
  77 KBUILD_CFLAGS += $(call cc-disable-warning, asm-operand-widths)
  78 endif
  79
  80 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
  81 # in 32-bit arithmetic
  82 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
  83                         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
  84                         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
  85                         - (1 << (64 - 32 - 3)) )) )
  86
  87 export  TEXT_OFFSET GZFLAGS
  88
  89 core-y          += arch/arm64/kernel/ arch/arm64/mm/
  90 core-$(CONFIG_NET) += arch/arm64/net/
  91 core-$(CONFIG_KVM) += arch/arm64/kvm/
  92 core-$(CONFIG_XEN) += arch/arm64/xen/
  93 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
  94 libs-y          := arch/arm64/lib/ $(libs-y)
  95 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
  96
  97 # Default target when executing plain make
  98 ifeq ($(CONFIG_BUILD_ARM64_APPENDED_DTB_IMAGE),y)
  99 KBUILD_IMAGE    := $(subst $\",,$(CONFIG_BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME))
 100 else
 101 KBUILD_IMAGE    := Image.gz
 102 endif
 103
 104 KBUILD_DTBS     := dtbs
 105
 106 all:    $(KBUILD_IMAGE) $(KBUILD_DTBS)
 107
 108 boot := arch/arm64/boot
 109
 110 Image: vmlinux
 111         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 112
 113 Image.%: vmlinux
 114         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 115
 116 zinstall install: vmlinux
 117         $(Q)$(MAKE) $(build)=$(boot) $@
 118
 119 %.dtb: scripts
 120         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 121
 122 PHONY += dtbs dtbs_install
 123
 124 dtbs: prepare scripts
 125         $(Q)$(MAKE) $(build)=$(boot)/dts
 126
 127 dtbs_install:
 128         $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 129
 130 Image-dtb Image.gz-dtb: vmlinux scripts dtbs
 131         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 132
 133 PHONY += vdso_install
 134 vdso_install:
 135         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 136
 137 # We use MRPROPER_FILES and CLEAN_FILES now
 138 archclean:
 139         $(Q)$(MAKE) $(clean)=$(boot)
 140         $(Q)$(MAKE) $(clean)=$(boot)/dts
 141
 142 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 143 # In order to do that, we should use the archprepare target, but we can't since
 144 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 145 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 146 # Therefore we need to generate the header after prepare0 has been made, hence
 147 # this hack.
 148 prepare: vdso_prepare
 149 vdso_prepare: prepare0
 150         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 151
 152 define archhelp
 153   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 154   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 155   echo  '* dtbs          - Build device tree blobs for enabled boards'
 156   echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
 157   echo  '  install       - Install uncompressed kernel'
 158   echo  '  zinstall      - Install compressed kernel'
 159   echo  '                  Install using (your) ~/bin/installkernel or'
 160   echo  '                  (distribution) /sbin/installkernel or'
 161   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 162 endef