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 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_STACKPROTECTOR_PER_TASK),y)
  60 prepare: stack_protector_prepare
  61 stack_protector_prepare: prepare0
  62         $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg            \
  63                                 -mstack-protector-guard-reg=sp_el0        \
  64                                 -mstack-protector-guard-offset=$(shell    \
  65                         awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  66                                         include/generated/asm-offsets.h))
  67 endif
  68
  69 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  70 KBUILD_CPPFLAGS += -mbig-endian
  71 CHECKFLAGS      += -D__AARCH64EB__
  72 AS              += -EB
  73 # Prefer the baremetal ELF build target, but not all toolchains include
  74 # it so fall back to the standard linux version if needed.
  75 KBUILD_LDFLAGS  += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
  76 UTS_MACHINE     := aarch64_be
  77 else
  78 KBUILD_CPPFLAGS += -mlittle-endian
  79 CHECKFLAGS      += -D__AARCH64EL__
  80 AS              += -EL
  81 # Same as above, prefer ELF but fall back to linux target if needed.
  82 KBUILD_LDFLAGS  += -EL $(call ld-option, -maarch64elf, -maarch64linux)
  83 UTS_MACHINE     := aarch64
  84 endif
  85
  86 CHECKFLAGS      += -D__aarch64__
  87
  88 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  89 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  90 endif
  91
  92 # Default value
  93 head-y          := arch/arm64/kernel/head.o
  94
  95 # The byte offset of the kernel image in RAM from the start of RAM.
  96 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  97 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  98                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  99                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
 100 else
 101 TEXT_OFFSET := 0x00080000
 102 endif
 103
 104 ifeq ($(CONFIG_KASAN_SW_TAGS), y)
 105 KASAN_SHADOW_SCALE_SHIFT := 4
 106 else
 107 KASAN_SHADOW_SCALE_SHIFT := 3
 108 endif
 109
 110 KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 111 KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 112 KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 113
 114 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
 115 #                                - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
 116 # in 32-bit arithmetic
 117 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
 118         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
 119         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
 120         - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) )
 121
 122 export  TEXT_OFFSET GZFLAGS
 123
 124 core-y          += arch/arm64/kernel/ arch/arm64/mm/
 125 core-$(CONFIG_NET) += arch/arm64/net/
 126 core-$(CONFIG_KVM) += arch/arm64/kvm/
 127 core-$(CONFIG_XEN) += arch/arm64/xen/
 128 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 129 libs-y          := arch/arm64/lib/ $(libs-y)
 130 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 131
 132 # Default target when executing plain make
 133 boot            := arch/arm64/boot
 134 KBUILD_IMAGE    := $(boot)/Image.gz
 135
 136 all:    Image.gz
 137
 138
 139 Image: vmlinux
 140         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 141
 142 Image.%: Image
 143         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 144
 145 zinstall install:
 146         $(Q)$(MAKE) $(build)=$(boot) $@
 147
 148 PHONY += vdso_install
 149 vdso_install:
 150         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 151
 152 # We use MRPROPER_FILES and CLEAN_FILES now
 153 archclean:
 154         $(Q)$(MAKE) $(clean)=$(boot)
 155
 156 ifeq ($(KBUILD_EXTMOD),)
 157 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 158 # In order to do that, we should use the archprepare target, but we can't since
 159 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 160 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 161 # Therefore we need to generate the header after prepare0 has been made, hence
 162 # this hack.
 163 prepare: vdso_prepare
 164 vdso_prepare: prepare0
 165         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 166 endif
 167
 168 define archhelp
 169   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 170   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 171   echo  '  install       - Install uncompressed kernel'
 172   echo  '  zinstall      - Install compressed kernel'
 173   echo  '                  Install using (your) ~/bin/installkernel or'
 174   echo  '                  (distribution) /sbin/installkernel or'
 175   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 176 endef