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 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
  41
  42 ifneq ($(brokengasinst),)
  43 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
  44 endif
  45
  46 KBUILD_CFLAGS   += -mgeneral-regs-only $(lseinstr) $(brokengasinst)
  47 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  48 KBUILD_CFLAGS   += $(call cc-option, -mpc-relative-literal-loads)
  49 KBUILD_AFLAGS   += $(lseinstr) $(brokengasinst)
  50
  51 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  52 KBUILD_CPPFLAGS += -mbig-endian
  53 AS              += -EB
  54 LD              += -EB
  55 UTS_MACHINE     := aarch64_be
  56 else
  57 KBUILD_CPPFLAGS += -mlittle-endian
  58 AS              += -EL
  59 LD              += -EL
  60 UTS_MACHINE     := aarch64
  61 endif
  62
  63 CHECKFLAGS      += -D__aarch64__
  64
  65 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
  66 KBUILD_CFLAGS_MODULE    += -mcmodel=large
  67 endif
  68
  69 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  70 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  71 endif
  72
  73 # Default value
  74 head-y          := arch/arm64/kernel/head.o
  75
  76 # The byte offset of the kernel image in RAM from the start of RAM.
  77 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  78 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  79                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  80                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
  81 else
  82 TEXT_OFFSET := 0x00080000
  83 endif
  84
  85 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
  86 # in 32-bit arithmetic
  87 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
  88                         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
  89                         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
  90                         - (1 << (64 - 32 - 3)) )) )
  91
  92 export  TEXT_OFFSET GZFLAGS
  93
  94 core-y          += arch/arm64/kernel/ arch/arm64/mm/
  95 core-$(CONFIG_NET) += arch/arm64/net/
  96 core-$(CONFIG_KVM) += arch/arm64/kvm/
  97 core-$(CONFIG_XEN) += arch/arm64/xen/
  98 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
  99 libs-y          := arch/arm64/lib/ $(libs-y)
 100 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 101
 102 # Default target when executing plain make
 103 KBUILD_IMAGE    := Image.gz
 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.%: Image
 114         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 115
 116 zinstall install:
 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 PHONY += vdso_install
 131 vdso_install:
 132         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 133
 134 # We use MRPROPER_FILES and CLEAN_FILES now
 135 archclean:
 136         $(Q)$(MAKE) $(clean)=$(boot)
 137         $(Q)$(MAKE) $(clean)=$(boot)/dts
 138
 139 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 140 # In order to do that, we should use the archprepare target, but we can't since
 141 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 142 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 143 # Therefore we need to generate the header after prepare0 has been made, hence
 144 # this hack.
 145 prepare: vdso_prepare
 146 vdso_prepare: prepare0
 147         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 148
 149 define archhelp
 150   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 151   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 152   echo  '* dtbs          - Build device tree blobs for enabled boards'
 153   echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
 154   echo  '  install       - Install uncompressed kernel'
 155   echo  '  zinstall      - Install compressed kernel'
 156   echo  '                  Install using (your) ~/bin/installkernel or'
 157   echo  '                  (distribution) /sbin/installkernel or'
 158   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 159 endef