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 # Prefer the baremetal ELF build target, but not all toolchains include
  64 # it so fall back to the standard linux version if needed.
  65 KBUILD_LDFLAGS  += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
  66 UTS_MACHINE     := aarch64_be
  67 else
  68 KBUILD_CPPFLAGS += -mlittle-endian
  69 CHECKFLAGS      += -D__AARCH64EL__
  70 AS              += -EL
  71 # Same as above, prefer ELF but fall back to linux target if needed.
  72 KBUILD_LDFLAGS  += -EL $(call ld-option, -maarch64elf, -maarch64linux)
  73 UTS_MACHINE     := aarch64
  74 endif
  75
  76 CHECKFLAGS      += -D__aarch64__
  77
  78 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  79 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  80 endif
  81
  82 # Default value
  83 head-y          := arch/arm64/kernel/head.o
  84
  85 # The byte offset of the kernel image in RAM from the start of RAM.
  86 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  87 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  88                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  89                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
  90 else
  91 TEXT_OFFSET := 0x00080000
  92 endif
  93
  94 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
  95 #                                - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
  96 # in 32-bit arithmetic
  97 KASAN_SHADOW_SCALE_SHIFT := 3
  98 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
  99         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
 100         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
 101         - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
 102
 103 export  TEXT_OFFSET GZFLAGS
 104
 105 core-y          += arch/arm64/kernel/ arch/arm64/mm/
 106 core-$(CONFIG_NET) += arch/arm64/net/
 107 core-$(CONFIG_KVM) += arch/arm64/kvm/
 108 core-$(CONFIG_XEN) += arch/arm64/xen/
 109 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 110 libs-y          := arch/arm64/lib/ $(libs-y)
 111 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 112
 113 # Default target when executing plain make
 114 boot            := arch/arm64/boot
 115 KBUILD_IMAGE    := $(boot)/Image.gz
 116
 117 all:    Image.gz
 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 PHONY += vdso_install
 130 vdso_install:
 131         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 132
 133 # We use MRPROPER_FILES and CLEAN_FILES now
 134 archclean:
 135         $(Q)$(MAKE) $(clean)=$(boot)
 136
 137 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 138 # In order to do that, we should use the archprepare target, but we can't since
 139 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 140 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 141 # Therefore we need to generate the header after prepare0 has been made, hence
 142 # this hack.
 143 prepare: vdso_prepare
 144 vdso_prepare: prepare0
 145         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 146
 147 define archhelp
 148   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 149   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 150   echo  '  install       - Install uncompressed kernel'
 151   echo  '  zinstall      - Install compressed kernel'
 152   echo  '                  Install using (your) ~/bin/installkernel or'
 153   echo  '                  (distribution) /sbin/installkernel or'
 154   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 155 endef