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         += -shared -Bsymbolic -z notext -z norelro \
  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 # Check for binutils support for specific extensions
  34 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
  35
  36 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
  37   ifeq ($(lseinstr),)
  38 $(warning LSE atomics not supported by binutils)
  39   endif
  40 endif
  41
  42 ifeq ($(CONFIG_ARM64), y)
  43 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
  44
  45   ifneq ($(brokengasinst),)
  46 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
  47   endif
  48 endif
  49
  50 ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
  51   CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)
  52
  53   ifeq ($(CONFIG_CC_IS_CLANG), y)
  54     $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
  55   else ifeq ($(strip $(CROSS_COMPILE_COMPAT)),)
  56     $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
  57   else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
  58     $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
  59   else
  60     export CROSS_COMPILE_COMPAT
  61     export CONFIG_COMPAT_VDSO := y
  62     compat_vdso := -DCONFIG_COMPAT_VDSO=1
  63   endif
  64 endif
  65
  66 KBUILD_CFLAGS   += -mgeneral-regs-only $(lseinstr) $(brokengasinst) $(compat_vdso)
  67 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  68 KBUILD_CFLAGS   += $(call cc-disable-warning, psabi)
  69 KBUILD_AFLAGS   += $(lseinstr) $(brokengasinst) $(compat_vdso)
  70
  71 KBUILD_CFLAGS   += $(call cc-option,-mabi=lp64)
  72 KBUILD_AFLAGS   += $(call cc-option,-mabi=lp64)
  73
  74 ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  75 prepare: stack_protector_prepare
  76 stack_protector_prepare: prepare0
  77         $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg            \
  78                                 -mstack-protector-guard-reg=sp_el0        \
  79                                 -mstack-protector-guard-offset=$(shell    \
  80                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  81                                         include/generated/asm-offsets.h))
  82 endif
  83
  84 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  85 KBUILD_CPPFLAGS += -mbig-endian
  86 CHECKFLAGS      += -D__AARCH64EB__
  87 AS              += -EB
  88 # Prefer the baremetal ELF build target, but not all toolchains include
  89 # it so fall back to the standard linux version if needed.
  90 KBUILD_LDFLAGS  += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
  91 UTS_MACHINE     := aarch64_be
  92 else
  93 KBUILD_CPPFLAGS += -mlittle-endian
  94 CHECKFLAGS      += -D__AARCH64EL__
  95 AS              += -EL
  96 # Same as above, prefer ELF but fall back to linux target if needed.
  97 KBUILD_LDFLAGS  += -EL $(call ld-option, -maarch64elf, -maarch64linux)
  98 UTS_MACHINE     := aarch64
  99 endif
 100
 101 CHECKFLAGS      += -D__aarch64__
 102
 103 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
 104 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
 105 endif
 106
 107 # Default value
 108 head-y          := arch/arm64/kernel/head.o
 109
 110 # The byte offset of the kernel image in RAM from the start of RAM.
 111 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
 112 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
 113                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
 114                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
 115 else
 116 TEXT_OFFSET := 0x00080000
 117 endif
 118
 119 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
 120 KASAN_SHADOW_SCALE_SHIFT := 4
 121 else
 122 KASAN_SHADOW_SCALE_SHIFT := 3
 123 endif
 124
 125 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 126 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 127 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 128
 129 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
 130 #                                - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
 131 # in 32-bit arithmetic
 132 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
 133         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
 134         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
 135         - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
 136
 137 export  TEXT_OFFSET GZFLAGS
 138
 139 core-y          += arch/arm64/kernel/ arch/arm64/mm/
 140 core-$(CONFIG_NET) += arch/arm64/net/
 141 core-$(CONFIG_KVM) += arch/arm64/kvm/
 142 core-$(CONFIG_XEN) += arch/arm64/xen/
 143 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 144 libs-y          := arch/arm64/lib/ $(libs-y)
 145 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 146
 147 # Default target when executing plain make
 148 boot            := arch/arm64/boot
 149 KBUILD_IMAGE    := $(boot)/Image.gz
 150
 151 all:    Image.gz
 152
 153
 154 Image: vmlinux
 155         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 156
 157 Image.%: Image
 158         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 159
 160 zinstall install:
 161         $(Q)$(MAKE) $(build)=$(boot) $@
 162
 163 PHONY += vdso_install
 164 vdso_install:
 165         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 166
 167 # We use MRPROPER_FILES and CLEAN_FILES now
 168 archclean:
 169         $(Q)$(MAKE) $(clean)=$(boot)
 170
 171 ifeq ($(KBUILD_EXTMOD),)
 172 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 173 # In order to do that, we should use the archprepare target, but we can't since
 174 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 175 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 176 # Therefore we need to generate the header after prepare0 has been made, hence
 177 # this hack.
 178 prepare: vdso_prepare
 179 vdso_prepare: prepare0
 180         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 181         $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
 182                 $(build)=arch/arm64/kernel/vdso32  \
 183                 include/generated/vdso32-offsets.h)
 184 endif
 185
 186 define archhelp
 187   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 188   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 189   echo  '  install       - Install uncompressed kernel'
 190   echo  '  zinstall      - Install compressed kernel'
 191   echo  '                  Install using (your) ~/bin/installkernel or'
 192   echo  '                  (distribution) /sbin/installkernel or'
 193   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 194 endef