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 LDFLAGS_vmlinux += --fix-cortex-a53-843419
  30   endif
  31 endif
  32
  33 KBUILD_DEFCONFIG := defconfig
  34
  35 # Check for binutils support for specific extensions
  36 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
  37
  38 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
  39   ifeq ($(lseinstr),)
  40 $(warning LSE atomics not supported by binutils)
  41   endif
  42 endif
  43
  44 ifeq ($(CONFIG_ARM64), y)
  45 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
  46
  47   ifneq ($(brokengasinst),)
  48 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
  49   endif
  50 endif
  51
  52 KBUILD_CFLAGS   += -mgeneral-regs-only $(lseinstr) $(brokengasinst)
  53 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  54 KBUILD_AFLAGS   += $(lseinstr) $(brokengasinst)
  55
  56 KBUILD_CFLAGS   += $(call cc-option,-mabi=lp64)
  57 KBUILD_AFLAGS   += $(call cc-option,-mabi=lp64)
  58
  59 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  60 KBUILD_CPPFLAGS += -mbig-endian
  61 CHECKFLAGS      += -D__AARCH64EB__
  62 AS              += -EB
  63 # We must use the linux target here, since distributions don't tend to package
  64 # the ELF linker scripts with binutils, and this results in a build failure.
  65 LDFLAGS         += -EB -maarch64linuxb
  66 UTS_MACHINE     := aarch64_be
  67 else
  68 KBUILD_CPPFLAGS += -mlittle-endian
  69 CHECKFLAGS      += -D__AARCH64EL__
  70 AS              += -EL
  71 LDFLAGS         += -EL -maarch64linux # See comment above
  72 UTS_MACHINE     := aarch64
  73 endif
  74
  75 CHECKFLAGS      += -D__aarch64__
  76
  77 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  78 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  79 endif
  80
  81 # Default value
  82 head-y          := arch/arm64/kernel/head.o
  83
  84 # The byte offset of the kernel image in RAM from the start of RAM.
  85 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  86 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  87                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  88                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
  89 else
  90 TEXT_OFFSET := 0x00080000
  91 endif
  92
  93 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
  94 #                                - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
  95 # in 32-bit arithmetic
  96 KASAN_SHADOW_SCALE_SHIFT := 3
  97 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
  98         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
  99         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
 100         - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
 101
 102 export  TEXT_OFFSET GZFLAGS
 103
 104 core-y          += arch/arm64/kernel/ arch/arm64/mm/
 105 core-$(CONFIG_NET) += arch/arm64/net/
 106 core-$(CONFIG_KVM) += arch/arm64/kvm/
 107 core-$(CONFIG_XEN) += arch/arm64/xen/
 108 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 109 libs-y          := arch/arm64/lib/ $(libs-y)
 110 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 111
 112 # Default target when executing plain make
 113 boot            := arch/arm64/boot
 114 KBUILD_IMAGE    := $(boot)/Image.gz
 115 KBUILD_DTBS     := dtbs
 116
 117 all:    Image.gz $(KBUILD_DTBS)
 118
 119
 120 Image: vmlinux
 121         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 122
 123 Image.%: Image
 124         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 125
 126 zinstall install:
 127         $(Q)$(MAKE) $(build)=$(boot) $@
 128
 129 %.dtb: scripts
 130         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 131
 132 PHONY += dtbs dtbs_install
 133
 134 dtbs: prepare scripts
 135         $(Q)$(MAKE) $(build)=$(boot)/dts
 136
 137 dtbs_install:
 138         $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 139
 140 PHONY += vdso_install
 141 vdso_install:
 142         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 143
 144 # We use MRPROPER_FILES and CLEAN_FILES now
 145 archclean:
 146         $(Q)$(MAKE) $(clean)=$(boot)
 147         $(Q)$(MAKE) $(clean)=$(boot)/dts
 148
 149 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 150 # In order to do that, we should use the archprepare target, but we can't since
 151 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 152 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 153 # Therefore we need to generate the header after prepare0 has been made, hence
 154 # this hack.
 155 prepare: vdso_prepare
 156 vdso_prepare: prepare0
 157         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 158
 159 define archhelp
 160   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 161   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 162   echo  '* dtbs          - Build device tree blobs for enabled boards'
 163   echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
 164   echo  '  install       - Install uncompressed kernel'
 165   echo  '  zinstall      - Install compressed kernel'
 166   echo  '                  Install using (your) ~/bin/installkernel or'
 167   echo  '                  (distribution) /sbin/installkernel or'
 168   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 169 endef