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=$(TEXT_OFFSET)
  15 GZFLAGS         :=-9
  16
  17 ifeq ($(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 KBUILD_CFLAGS   += $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128)
  60
  61 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  62 KBUILD_CPPFLAGS += -mbig-endian
  63 CHECKFLAGS      += -D__AARCH64EB__
  64 AS              += -EB
  65 LD              += -EB
  66 LDFLAGS         += -maarch64linuxb
  67 UTS_MACHINE     := aarch64_be
  68 else
  69 KBUILD_CPPFLAGS += -mlittle-endian
  70 CHECKFLAGS      += -D__AARCH64EL__
  71 AS              += -EL
  72 LD              += -EL
  73 LDFLAGS         += -maarch64linux
  74 UTS_MACHINE     := aarch64
  75 endif
  76
  77 CHECKFLAGS      += -D__aarch64__ -m64
  78
  79 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  80 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  81 endif
  82
  83 # Default value
  84 head-y          := arch/arm64/kernel/head.o
  85
  86 # The byte offset of the kernel image in RAM from the start of RAM.
  87 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  88 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  89                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  90                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
  91 else
  92 TEXT_OFFSET := 0x00080000
  93 endif
  94
  95 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
  96 #                                - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
  97 # in 32-bit arithmetic
  98 KASAN_SHADOW_SCALE_SHIFT := 3
  99 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
 100         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
 101         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
 102         - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
 103
 104 export  TEXT_OFFSET GZFLAGS
 105
 106 core-y          += arch/arm64/kernel/ arch/arm64/mm/
 107 core-$(CONFIG_NET) += arch/arm64/net/
 108 core-$(CONFIG_KVM) += arch/arm64/kvm/
 109 core-$(CONFIG_XEN) += arch/arm64/xen/
 110 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 111 libs-y          := arch/arm64/lib/ $(libs-y)
 112 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 113
 114 # Default target when executing plain make
 115 boot            := arch/arm64/boot
 116 KBUILD_IMAGE    := $(boot)/Image.gz
 117 KBUILD_DTBS     := dtbs
 118
 119 all:    Image.gz $(KBUILD_DTBS)
 120
 121
 122 Image: vmlinux
 123         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 124
 125 Image.%: Image
 126         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 127
 128 zinstall install:
 129         $(Q)$(MAKE) $(build)=$(boot) $@
 130
 131 %.dtb: scripts
 132         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 133
 134 PHONY += dtbs dtbs_install
 135
 136 dtbs: prepare scripts
 137         $(Q)$(MAKE) $(build)=$(boot)/dts
 138
 139 dtbs_install:
 140         $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 141
 142 PHONY += vdso_install
 143 vdso_install:
 144         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 145
 146 # We use MRPROPER_FILES and CLEAN_FILES now
 147 archclean:
 148         $(Q)$(MAKE) $(clean)=$(boot)
 149         $(Q)$(MAKE) $(clean)=$(boot)/dts
 150
 151 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 152 # In order to do that, we should use the archprepare target, but we can't since
 153 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 154 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 155 # Therefore we need to generate the header after prepare0 has been made, hence
 156 # this hack.
 157 prepare: vdso_prepare
 158 vdso_prepare: prepare0
 159         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 160
 161 define archhelp
 162   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 163   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 164   echo  '* dtbs          - Build device tree blobs for enabled boards'
 165   echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
 166   echo  '  install       - Install uncompressed kernel'
 167   echo  '  zinstall      - Install compressed kernel'
 168   echo  '                  Install using (your) ~/bin/installkernel or'
 169   echo  '                  (distribution) /sbin/installkernel or'
 170   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 171 endef