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=$(TEXT_OFFSET)
  15 GZFLAGS         :=-9
  16
  17 ifneq ($(CONFIG_RELOCATABLE),)
  18 LDFLAGS_vmlinux         += -pie -shared -Bsymbolic
  19 endif
  20
  21 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
  22   ifeq ($(call ld-option, --fix-cortex-a53-843419),)
  23 $(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
  24   else
  25 LDFLAGS_vmlinux += --fix-cortex-a53-843419
  26   endif
  27 endif
  28
  29 KBUILD_DEFCONFIG := defconfig
  30
  31 # Check for binutils support for specific extensions
  32 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
  33
  34 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
  35   ifeq ($(lseinstr),)
  36 $(warning LSE atomics not supported by binutils)
  37   endif
  38 endif
  39
  40 ifeq ($(CONFIG_ARM64), y)
  41 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
  42
  43   ifneq ($(brokengasinst),)
  44 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
  45   endif
  46 endif
  47
  48 KBUILD_CFLAGS   += -mgeneral-regs-only $(lseinstr) $(brokengasinst)
  49 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  50 KBUILD_CFLAGS   += $(call cc-option, -mpc-relative-literal-loads)
  51 KBUILD_AFLAGS   += $(lseinstr) $(brokengasinst)
  52
  53 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  54 KBUILD_CPPFLAGS += -mbig-endian
  55 CHECKFLAGS      += -D__AARCH64EB__
  56 AS              += -EB
  57 LD              += -EB
  58 UTS_MACHINE     := aarch64_be
  59 else
  60 KBUILD_CPPFLAGS += -mlittle-endian
  61 CHECKFLAGS      += -D__AARCH64EL__
  62 AS              += -EL
  63 LD              += -EL
  64 UTS_MACHINE     := aarch64
  65 endif
  66
  67 CHECKFLAGS      += -D__aarch64__ -m64
  68
  69 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
  70 KBUILD_CFLAGS_MODULE    += -mcmodel=large
  71 endif
  72
  73 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  74 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  75 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
  76 KBUILD_LDFLAGS_MODULE   += $(objtree)/arch/arm64/kernel/ftrace-mod.o
  77 endif
  78 endif
  79
  80 # Default value
  81 head-y          := arch/arm64/kernel/head.o
  82
  83 # The byte offset of the kernel image in RAM from the start of RAM.
  84 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  85 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  86                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  87                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
  88 else
  89 TEXT_OFFSET := 0x00080000
  90 endif
  91
  92 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
  93 # in 32-bit arithmetic
  94 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
  95                         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
  96                         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
  97                         - (1 << (64 - 32 - 3)) )) )
  98
  99 export  TEXT_OFFSET GZFLAGS
 100
 101 core-y          += arch/arm64/kernel/ arch/arm64/mm/
 102 core-$(CONFIG_NET) += arch/arm64/net/
 103 core-$(CONFIG_KVM) += arch/arm64/kvm/
 104 core-$(CONFIG_XEN) += arch/arm64/xen/
 105 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 106 libs-y          := arch/arm64/lib/ $(libs-y)
 107 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 108
 109 # Default target when executing plain make
 110 boot            := arch/arm64/boot
 111 KBUILD_IMAGE    := $(boot)/Image.gz
 112 KBUILD_DTBS     := dtbs
 113
 114 all:    Image.gz $(KBUILD_DTBS)
 115
 116
 117 Image: vmlinux
 118         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 119
 120 Image.%: Image
 121         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 122
 123 zinstall install:
 124         $(Q)$(MAKE) $(build)=$(boot) $@
 125
 126 %.dtb: scripts
 127         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 128
 129 PHONY += dtbs dtbs_install
 130
 131 dtbs: prepare scripts
 132         $(Q)$(MAKE) $(build)=$(boot)/dts
 133
 134 dtbs_install:
 135         $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 136
 137 PHONY += vdso_install
 138 vdso_install:
 139         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 140
 141 # We use MRPROPER_FILES and CLEAN_FILES now
 142 archclean:
 143         $(Q)$(MAKE) $(clean)=$(boot)
 144         $(Q)$(MAKE) $(clean)=$(boot)/dts
 145
 146 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 147 # In order to do that, we should use the archprepare target, but we can't since
 148 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 149 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 150 # Therefore we need to generate the header after prepare0 has been made, hence
 151 # this hack.
 152 prepare: vdso_prepare
 153 vdso_prepare: prepare0
 154         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 155
 156 define archhelp
 157   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 158   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 159   echo  '* dtbs          - Build device tree blobs for enabled boards'
 160   echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
 161   echo  '  install       - Install uncompressed kernel'
 162   echo  '  zinstall      - Install compressed kernel'
 163   echo  '                  Install using (your) ~/bin/installkernel or'
 164   echo  '                  (distribution) /sbin/installkernel or'
 165   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 166 endef