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 KBUILD_CFLAGS   += -mgeneral-regs-only $(lseinstr)
  45 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  46 KBUILD_CFLAGS   += $(call cc-option, -mpc-relative-literal-loads)
  47 KBUILD_AFLAGS   += $(lseinstr)
  48
  49 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  50 KBUILD_CPPFLAGS += -mbig-endian
  51 AS              += -EB
  52 LD              += -EB
  53 UTS_MACHINE     := aarch64_be
  54 else
  55 KBUILD_CPPFLAGS += -mlittle-endian
  56 AS              += -EL
  57 LD              += -EL
  58 UTS_MACHINE     := aarch64
  59 endif
  60
  61 CHECKFLAGS      += -D__aarch64__
  62
  63 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
  64 KBUILD_CFLAGS_MODULE    += -mcmodel=large
  65 endif
  66
  67 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  68 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  69 endif
  70
  71 # Default value
  72 head-y          := arch/arm64/kernel/head.o
  73
  74 # The byte offset of the kernel image in RAM from the start of RAM.
  75 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  76 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  77                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  78                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
  79 else
  80 TEXT_OFFSET := 0x00080000
  81 endif
  82
  83 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
  84 # in 32-bit arithmetic
  85 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
  86                         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
  87                         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
  88                         - (1 << (64 - 32 - 3)) )) )
  89
  90 export  TEXT_OFFSET GZFLAGS
  91
  92 core-y          += arch/arm64/kernel/ arch/arm64/mm/
  93 core-$(CONFIG_NET) += arch/arm64/net/
  94 core-$(CONFIG_KVM) += arch/arm64/kvm/
  95 core-$(CONFIG_XEN) += arch/arm64/xen/
  96 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
  97 libs-y          := arch/arm64/lib/ $(libs-y)
  98 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
  99
 100 # Default target when executing plain make
 101 KBUILD_IMAGE    := Image.gz
 102 KBUILD_DTBS     := dtbs
 103
 104 all:    $(KBUILD_IMAGE) $(KBUILD_DTBS)
 105
 106 boot := arch/arm64/boot
 107
 108 Image: vmlinux
 109         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 110
 111 Image.%: Image
 112         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 113
 114 zinstall install:
 115         $(Q)$(MAKE) $(build)=$(boot) $@
 116
 117 %.dtb: scripts
 118         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 119
 120 PHONY += dtbs dtbs_install
 121
 122 dtbs: prepare scripts
 123         $(Q)$(MAKE) $(build)=$(boot)/dts
 124
 125 dtbs_install:
 126         $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 127
 128 PHONY += vdso_install
 129 vdso_install:
 130         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 131
 132 # We use MRPROPER_FILES and CLEAN_FILES now
 133 archclean:
 134         $(Q)$(MAKE) $(clean)=$(boot)
 135         $(Q)$(MAKE) $(clean)=$(boot)/dts
 136
 137 ifeq ($(KBUILD_EXTMOD),)
 138 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 139 # In order to do that, we should use the archprepare target, but we can't since
 140 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 141 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 142 # Therefore we need to generate the header after prepare0 has been made, hence
 143 # this hack.
 144 prepare: vdso_prepare
 145 vdso_prepare: prepare0
 146         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 147 endif
 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