linux/arch/arm64/Makefile
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   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
  13LDFLAGS_vmlinux :=--no-undefined -X
  14
  15ifeq ($(CONFIG_RELOCATABLE), y)
  16# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
  17# for relative relocs, since this leads to better Image compression
  18# with the relocation offsets always being zero.
  19LDFLAGS_vmlinux         += -shared -Bsymbolic -z notext \
  20                        $(call ld-option, --no-apply-dynamic-relocs)
  21endif
  22
  23ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
  24  ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
  25LDFLAGS_vmlinux += --fix-cortex-a53-843419
  26  endif
  27endif
  28
  29cc_has_k_constraint := $(call try-run,echo                              \
  30        'int main(void) {                                               \
  31                asm volatile("and w0, w0, %w0" :: "K" (4294967295));    \
  32                return 0;                                               \
  33        }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
  34
  35ifeq ($(CONFIG_BROKEN_GAS_INST),y)
  36$(warning Detected assembler with broken .inst; disassembly will be unreliable)
  37endif
  38
  39KBUILD_CFLAGS   += -mgeneral-regs-only  \
  40                   $(compat_vdso) $(cc_has_k_constraint)
  41KBUILD_CFLAGS   += $(call cc-disable-warning, psabi)
  42KBUILD_AFLAGS   += $(compat_vdso)
  43
  44KBUILD_CFLAGS   += $(call cc-option,-mabi=lp64)
  45KBUILD_AFLAGS   += $(call cc-option,-mabi=lp64)
  46
  47# Avoid generating .eh_frame* sections.
  48KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables -fno-unwind-tables
  49KBUILD_AFLAGS   += -fno-asynchronous-unwind-tables -fno-unwind-tables
  50
  51ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
  52prepare: stack_protector_prepare
  53stack_protector_prepare: prepare0
  54        $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg            \
  55                                -mstack-protector-guard-reg=sp_el0        \
  56                                -mstack-protector-guard-offset=$(shell    \
  57                        awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
  58                                        include/generated/asm-offsets.h))
  59endif
  60
  61# Ensure that if the compiler supports branch protection we default it
  62# off, this will be overridden if we are using branch protection.
  63branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)
  64
  65ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
  66branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all
  67# We enable additional protection for leaf functions as there is some
  68# narrow potential for ROP protection benefits and no substantial
  69# performance impact has been observed.
  70ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
  71branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=pac-ret+leaf+bti
  72else
  73branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf
  74endif
  75# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the
  76# compiler to generate them and consequently to break the single image contract
  77# we pass it only to the assembler. This option is utilized only in case of non
  78# integrated assemblers.
  79ifeq ($(CONFIG_AS_HAS_PAC), y)
  80asm-arch := armv8.3-a
  81endif
  82endif
  83
  84KBUILD_CFLAGS += $(branch-prot-flags-y)
  85
  86ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
  87# make sure to pass the newest target architecture to -march.
  88asm-arch := armv8.4-a
  89endif
  90
  91ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
  92# make sure to pass the newest target architecture to -march.
  93asm-arch := armv8.5-a
  94endif
  95
  96ifdef asm-arch
  97KBUILD_CFLAGS   += -Wa,-march=$(asm-arch) \
  98                   -DARM64_ASM_ARCH='"$(asm-arch)"'
  99endif
 100
 101ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
 102KBUILD_CFLAGS   += -ffixed-x18
 103endif
 104
 105ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
 106KBUILD_CPPFLAGS += -mbig-endian
 107CHECKFLAGS      += -D__AARCH64EB__
 108# Prefer the baremetal ELF build target, but not all toolchains include
 109# it so fall back to the standard linux version if needed.
 110KBUILD_LDFLAGS  += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro)
 111UTS_MACHINE     := aarch64_be
 112else
 113KBUILD_CPPFLAGS += -mlittle-endian
 114CHECKFLAGS      += -D__AARCH64EL__
 115# Same as above, prefer ELF but fall back to linux target if needed.
 116KBUILD_LDFLAGS  += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro)
 117UTS_MACHINE     := aarch64
 118endif
 119
 120ifeq ($(CONFIG_LD_IS_LLD), y)
 121KBUILD_LDFLAGS  += -z norelro
 122endif
 123
 124CHECKFLAGS      += -D__aarch64__
 125
 126ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y)
 127  KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
 128  CC_FLAGS_FTRACE := -fpatchable-function-entry=2
 129endif
 130
 131# Default value
 132head-y          := arch/arm64/kernel/head.o
 133
 134ifeq ($(CONFIG_KASAN_SW_TAGS), y)
 135KASAN_SHADOW_SCALE_SHIFT := 4
 136else ifeq ($(CONFIG_KASAN_GENERIC), y)
 137KASAN_SHADOW_SCALE_SHIFT := 3
 138endif
 139
 140KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 141KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 142KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
 143
 144libs-y          := arch/arm64/lib/ $(libs-y)
 145libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 146
 147# Default target when executing plain make
 148boot            := arch/arm64/boot
 149KBUILD_IMAGE    := $(boot)/Image.gz
 150
 151all:    Image.gz
 152
 153
 154Image: vmlinux
 155        $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 156
 157Image.%: Image
 158        $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 159
 160install: install-image := Image
 161zinstall: install-image := Image.gz
 162install zinstall:
 163        $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
 164        $(boot)/$(install-image) System.map "$(INSTALL_PATH)"
 165
 166PHONY += vdso_install
 167vdso_install:
 168        $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 169        $(if $(CONFIG_COMPAT_VDSO), \
 170                $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
 171
 172archprepare:
 173        $(Q)$(MAKE) $(build)=arch/arm64/tools kapi
 174ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
 175  ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
 176        @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2
 177  endif
 178endif
 179ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y)
 180  ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y)
 181        @echo "warning: LSE atomics not supported by binutils" >&2
 182  endif
 183endif
 184
 185
 186# We use MRPROPER_FILES and CLEAN_FILES now
 187archclean:
 188        $(Q)$(MAKE) $(clean)=$(boot)
 189        $(Q)$(MAKE) $(clean)=arch/arm64/kernel/vdso
 190        $(Q)$(MAKE) $(clean)=arch/arm64/kernel/vdso32
 191
 192ifeq ($(KBUILD_EXTMOD),)
 193# We need to generate vdso-offsets.h before compiling certain files in kernel/.
 194# In order to do that, we should use the archprepare target, but we can't since
 195# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 196# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 197# Therefore we need to generate the header after prepare0 has been made, hence
 198# this hack.
 199prepare: vdso_prepare
 200vdso_prepare: prepare0
 201        $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \
 202        include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so
 203ifdef CONFIG_COMPAT_VDSO
 204        $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \
 205        include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so
 206endif
 207endif
 208
 209define 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  '  install       - Install uncompressed kernel'
 213  echo  '  zinstall      - Install compressed kernel'
 214  echo  '                  Install using (your) ~/bin/installkernel or'
 215  echo  '                  (distribution) /sbin/installkernel or'
 216  echo  '                  install to $$(INSTALL_PATH) and run lilo'
 217endef
 218