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 $(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
  28   else
  29     ifeq ($(call gold-ifversion, -lt, 114000000, y), y)
  30 $(warning This version of GNU gold may generate incorrect code with --fix-cortex-a53-843419;\
  31         see https://sourceware.org/bugzilla/show_bug.cgi?id=21491)
  32     endif
  33 LDFLAGS_vmlinux += --fix-cortex-a53-843419
  34   endif
  35 else
  36   ifeq ($(ld-name),gold)
  37 # Pass --no-fix-cortex-a53-843419 to ensure the erratum fix is disabled
  38 LDFLAGS += --no-fix-cortex-a53-843419
  39   endif
  40 endif
  41
  42 KBUILD_DEFCONFIG := defconfig
  43
  44 # Check for binutils support for specific extensions
  45 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
  46
  47 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
  48   ifeq ($(lseinstr),)
  49 $(warning LSE atomics not supported by binutils)
  50   endif
  51 endif
  52
  53 ifeq ($(CONFIG_ARM64), y)
  54 brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
  55
  56   ifneq ($(brokengasinst),)
  57 $(warning Detected assembler with broken .inst; disassembly will be unreliable)
  58   endif
  59 endif
  60
  61 ifeq ($(cc-name),clang)
  62 # This is a workaround for https://bugs.llvm.org/show_bug.cgi?id=30792.
  63 # TODO: revert when this is fixed in LLVM.
  64 KBUILD_CFLAGS   += -mno-implicit-float
  65 else
  66 KBUILD_CFLAGS   += -mgeneral-regs-only
  67 endif
  68 KBUILD_CFLAGS   += $(lseinstr) $(brokengasinst)
  69 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  70 KBUILD_CFLAGS   += $(call cc-option, -mpc-relative-literal-loads)
  71 KBUILD_CFLAGS   += -fno-pic
  72 KBUILD_AFLAGS   += $(lseinstr) $(brokengasinst)
  73
  74 KBUILD_CFLAGS   += $(call cc-option,-mabi=lp64)
  75 KBUILD_AFLAGS   += $(call cc-option,-mabi=lp64)
  76
  77 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  78 KBUILD_CPPFLAGS += -mbig-endian
  79 CHECKFLAGS      += -D__AARCH64EB__
  80 AS              += -EB
  81 LD              += -EB
  82 ifeq ($(ld-name),gold)
  83 LDFLAGS         += -maarch64_elf64_be_vec
  84 else
  85 LDFLAGS         += -maarch64linuxb
  86 endif
  87 UTS_MACHINE     := aarch64_be
  88 else
  89 KBUILD_CPPFLAGS += -mlittle-endian
  90 CHECKFLAGS      += -D__AARCH64EL__
  91 AS              += -EL
  92 LD              += -EL
  93 ifeq ($(ld-name),gold)
  94 LDFLAGS         += -maarch64_elf64_le_vec
  95 else
  96 LDFLAGS         += -maarch64linux
  97 endif
  98 UTS_MACHINE     := aarch64
  99 endif
 100
 101 CHECKFLAGS      += -D__aarch64__ -m64
 102
 103 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
 104 KBUILD_CFLAGS_MODULE    += -mcmodel=large
 105 ifeq ($(CONFIG_LTO_CLANG), y)
 106 # Code model is not stored in LLVM IR, so we need to pass it also to LLVMgold
 107 KBUILD_LDFLAGS_MODULE   += -plugin-opt=-code-model=large
 108 endif
 109 endif
 110
 111 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
 112 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
 113 endif
 114
 115 # Default value
 116 head-y          := arch/arm64/kernel/head.o
 117
 118 # The byte offset of the kernel image in RAM from the start of RAM.
 119 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
 120 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
 121                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
 122                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
 123 else
 124 TEXT_OFFSET := 0x00080000
 125 endif
 126
 127 ifeq ($(cc-name),clang)
 128 KBUILD_CFLAGS += $(call cc-disable-warning, asm-operand-widths)
 129 endif
 130
 131 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
 132 # in 32-bit arithmetic
 133 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
 134                         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
 135                         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
 136                         - (1 << (64 - 32 - 3)) )) )
 137
 138 export  TEXT_OFFSET GZFLAGS
 139
 140 core-y          += arch/arm64/kernel/ arch/arm64/mm/
 141 core-$(CONFIG_NET) += arch/arm64/net/
 142 core-$(CONFIG_KVM) += arch/arm64/kvm/
 143 core-$(CONFIG_XEN) += arch/arm64/xen/
 144 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
 145 libs-y          := arch/arm64/lib/ $(libs-y)
 146 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 147
 148 # Default target when executing plain make
 149 boot            := arch/arm64/boot
 150 ifeq ($(CONFIG_BUILD_ARM64_APPENDED_DTB_IMAGE),y)
 151 KBUILD_IMAGE    := $(boot)/$(subst $\",,$(CONFIG_BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME))
 152 else
 153 KBUILD_IMAGE    := $(boot)/Image.gz
 154 endif
 155
 156 KBUILD_DTBS     := dtbs
 157
 158 all:    Image.gz $(KBUILD_DTBS) $(subst $\",,$(CONFIG_BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME))
 159
 160
 161 Image: vmlinux
 162         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 163
 164 Image.%: Image
 165         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 166
 167 zinstall install:
 168         $(Q)$(MAKE) $(build)=$(boot) $@
 169
 170 %.dtb: scripts
 171         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 172
 173 %.dtbo: scripts
 174         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 175
 176 PHONY += dtbs dtbs_install
 177
 178 dtbs: prepare scripts
 179         $(Q)$(MAKE) $(build)=$(boot)/dts
 180
 181 dtbs_install:
 182         $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 183
 184 Image-dtb: vmlinux scripts dtbs
 185         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 186
 187 Image.gz-dtb: vmlinux scripts dtbs Image.gz
 188         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 189
 190 PHONY += vdso_install
 191 vdso_install:
 192         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 193
 194 # We use MRPROPER_FILES and CLEAN_FILES now
 195 archclean:
 196         $(Q)$(MAKE) $(clean)=$(boot)
 197         $(Q)$(MAKE) $(clean)=$(boot)/dts
 198
 199 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 200 # In order to do that, we should use the archprepare target, but we can't since
 201 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 202 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 203 # Therefore we need to generate the header after prepare0 has been made, hence
 204 # this hack.
 205 prepare: vdso_prepare
 206 vdso_prepare: prepare0
 207         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 208
 209 define archhelp
 210   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 211   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 212   echo  '* dtbs          - Build device tree blobs for enabled boards'
 213   echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
 214   echo  '  install       - Install uncompressed kernel'
 215   echo  '  zinstall      - Install compressed kernel'
 216   echo  '                  Install using (your) ~/bin/installkernel or'
 217   echo  '                  (distribution) /sbin/installkernel or'
 218   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 219 endef