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 :=--no-undefined -X
  14 CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
  15 GZFLAGS         :=-9
  16
  17 ifeq ($(CONFIG_RELOCATABLE), y)
  18 # Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
  19 # for relative relocs, since this leads to better Image compression
  20 # with the relocation offsets always being zero.
  21 LDFLAGS_vmlinux         += -pie -shared -Bsymbolic \
  22                         $(call ld-option, --no-apply-dynamic-relocs)
  23 endif
  24
  25 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
  26   ifeq ($(call ld-option, --fix-cortex-a53-843419),)
  27 $(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
  28   else
  29     ifeq ($(call gold-ifversion, -lt, 114000000, y), y)
  30 $(warning This version of GNU gold may generate incorrect code with --fix-cortex-a53-843419;\
  31         see https://sourceware.org/bugzilla/show_bug.cgi?id=21491)
  32     endif
  33 LDFLAGS_vmlinux += --fix-cortex-a53-843419
  34   endif
  35 else
  36   ifeq ($(ld-name),gold)
  37 # Pass --no-fix-cortex-a53-843419 to ensure the erratum fix is disabled
  38 LDFLAGS += --no-fix-cortex-a53-843419
  39   endif
  40 endif
  41
  42 KBUILD_DEFCONFIG := defconfig
  43
  44 # Check for binutils support for specific extensions
  45 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
  46
  47 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
  48   ifeq ($(lseinstr),)
  49 $(warning LSE atomics not supported by binutils)
  50   endif
  51 endif
  52
  53 ifeq ($(cc-name),clang)
  54 # This is a workaround for https://bugs.llvm.org/show_bug.cgi?id=30792.
  55 # TODO: revert when this is fixed in LLVM.
  56 KBUILD_CFLAGS   += -mno-implicit-float
  57 else
  58 KBUILD_CFLAGS   += -mgeneral-regs-only
  59 endif
  60 KBUILD_CFLAGS   += $(lseinstr)
  61 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  62 KBUILD_CFLAGS   += $(call cc-option, -mpc-relative-literal-loads)
  63 KBUILD_CFLAGS   += -fno-pic
  64 KBUILD_AFLAGS   += $(lseinstr)
  65
  66 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  67 KBUILD_CPPFLAGS += -mbig-endian
  68 AS              += -EB
  69 LD              += -EB
  70 UTS_MACHINE     := aarch64_be
  71 else
  72 KBUILD_CPPFLAGS += -mlittle-endian
  73 AS              += -EL
  74 LD              += -EL
  75 UTS_MACHINE     := aarch64
  76 endif
  77
  78 CHECKFLAGS      += -D__aarch64__
  79
  80 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
  81 KBUILD_CFLAGS_MODULE    += -mcmodel=large
  82 ifeq ($(CONFIG_LTO_CLANG), y)
  83 # Code model is not stored in LLVM IR, so we need to pass it also to LLVMgold
  84 KBUILD_LDFLAGS_MODULE   += -plugin-opt=-code-model=large
  85 endif
  86 endif
  87
  88 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  89 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  90 endif
  91
  92 # Default value
  93 head-y          := arch/arm64/kernel/head.o
  94
  95 # The byte offset of the kernel image in RAM from the start of RAM.
  96 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  97 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  98                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  99                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
 100 else
 101 TEXT_OFFSET := 0x00080000
 102 endif
 103
 104 ifeq ($(cc-name),clang)
 105 KBUILD_CFLAGS += $(call cc-disable-warning, asm-operand-widths)
 106 endif
 107
 108 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
 109 # in 32-bit arithmetic
 110 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
 111                         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
 112                         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
 113                         - (1 << (64 - 32 - 3)) )) )
 114
 115 export  TEXT_OFFSET GZFLAGS
 116
 117 core-y          += arch/arm64/kernel/ arch/arm64/mm/
 118 core-$(CONFIG_NET) += arch/arm64/net/
 119 core-$(CONFIG_KVM) += arch/arm64/kvm/
 120 core-$(CONFIG_XEN) += arch/arm64/xen/
 121 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 122 libs-y          := arch/arm64/lib/ $(libs-y)
 123 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 124
 125 # Default target when executing plain make
 126 ifeq ($(CONFIG_BUILD_ARM64_APPENDED_DTB_IMAGE),y)
 127 KBUILD_IMAGE    := $(subst $\",,$(CONFIG_BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME))
 128 else
 129 KBUILD_IMAGE    := Image.gz
 130 endif
 131
 132 KBUILD_DTBS     := dtbs
 133
 134 all:    $(KBUILD_IMAGE) $(KBUILD_DTBS)
 135
 136 boot := arch/arm64/boot
 137
 138 Image: vmlinux
 139         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 140
 141 Image.%: Image
 142         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 143
 144 zinstall install:
 145         $(Q)$(MAKE) $(build)=$(boot) $@
 146
 147 %.dtb: scripts
 148         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 149
 150 PHONY += dtbs dtbs_install
 151
 152 dtbs: prepare scripts
 153         $(Q)$(MAKE) $(build)=$(boot)/dts
 154
 155 dtbs_install:
 156         $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 157
 158 Image-dtb Image.gz-dtb: vmlinux scripts dtbs
 159         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 160
 161 PHONY += vdso_install
 162 vdso_install:
 163         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 164
 165 # We use MRPROPER_FILES and CLEAN_FILES now
 166 archclean:
 167         $(Q)$(MAKE) $(clean)=$(boot)
 168         $(Q)$(MAKE) $(clean)=$(boot)/dts
 169
 170 ifeq ($(KBUILD_EXTMOD),)
 171 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 172 # In order to do that, we should use the archprepare target, but we can't since
 173 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 174 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 175 # Therefore we need to generate the header after prepare0 has been made, hence
 176 # this hack.
 177 prepare: vdso_prepare
 178 vdso_prepare: prepare0
 179         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 180 endif
 181
 182 define archhelp
 183   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 184   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 185   echo  '* dtbs          - Build device tree blobs for enabled boards'
 186   echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
 187   echo  '  install       - Install uncompressed kernel'
 188   echo  '  zinstall      - Install compressed kernel'
 189   echo  '                  Install using (your) ~/bin/installkernel or'
 190   echo  '                  (distribution) /sbin/installkernel or'
 191   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 192 endef