#
# arch/arm64/Makefile
#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies.
#
# This file is subject to the terms and conditions of the GNU General Public
# License.  See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1995-2001 by Russell King

LDFLAGS_vmlinux	:=--no-undefined -X
CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
GZFLAGS		:=-9

ifeq ($(CONFIG_RELOCATABLE), y)
# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour
# for relative relocs, since this leads to better Image compression
# with the relocation offsets always being zero.
LDFLAGS_vmlinux		+= -pie -shared -Bsymbolic \
			$(call ld-option, --no-apply-dynamic-relocs)
endif

ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
  ifeq ($(call ld-option, --fix-cortex-a53-843419),)
$(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
  else
LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
  endif
endif

KBUILD_DEFCONFIG := defconfig

# Check for binutils support for specific extensions
lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)

ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
  ifeq ($(lseinstr),)
$(warning LSE atomics not supported by binutils)
  endif
endif

ifeq ($(CONFIG_ARM64), y)
brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)

  ifneq ($(brokengasinst),)
$(warning Detected assembler with broken .inst; disassembly will be unreliable)
  endif
endif

ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y)
  CROSS_COMPILE_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)

  ifeq ($(CONFIG_CC_IS_CLANG), y)
    $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
  else ifeq ($(CROSS_COMPILE_COMPAT),)
    $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
  else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
    $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
  else
    export CROSS_COMPILE_COMPAT
    export CONFIG_COMPAT_VDSO := y
    compat_vdso := -DCONFIG_COMPAT_VDSO=1
  endif
endif

KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr) $(brokengasinst) $(compat_vdso)
KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
KBUILD_AFLAGS	+= $(lseinstr) $(brokengasinst) $(compat_vdso)

KBUILD_CFLAGS	+= $(call cc-option,-mabi=lp64)
KBUILD_AFLAGS	+= $(call cc-option,-mabi=lp64)

# FIXME: the module load should be taught about the additional relocs
# generated by this.
# revert to pre-gcc-4.4 behaviour of .eh_frame
KBUILD_CFLAGS	+= $(call cc-option,-fno-dwarf2-cfi-asm)

ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
prepare: stack_protector_prepare
stack_protector_prepare: prepare0
	$(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg		  \
				-mstack-protector-guard-reg=sp_el0	  \
				-mstack-protector-guard-offset=$(shell	  \
			awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
					include/generated/asm-offsets.h))
endif

ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
# make sure to pass the newest target architecture to -march.
KBUILD_CFLAGS	+= -Wa,-march=armv8.4-a
endif

ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
KBUILD_CPPFLAGS	+= -mbig-endian
CHECKFLAGS	+= -D__AARCH64EB__
AS		+= -EB
# We must use the linux target here, since distributions don't tend to package
# the ELF linker scripts with binutils, and this results in a build failure.
LDFLAGS		+= -EB -maarch64linuxb
UTS_MACHINE	:= aarch64_be
else
KBUILD_CPPFLAGS	+= -mlittle-endian
CHECKFLAGS	+= -D__AARCH64EL__
AS		+= -EL
LDFLAGS		+= -EL -maarch64linux # See comment above
UTS_MACHINE	:= aarch64
endif

CHECKFLAGS	+= -D__aarch64__

ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
endif

# Default value
head-y		:= arch/arm64/kernel/head.o

# The byte offset of the kernel image in RAM from the start of RAM.
ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
else
TEXT_OFFSET := 0x0
endif

ifeq ($(CONFIG_KASAN_SW_TAGS), y)
KASAN_SHADOW_SCALE_SHIFT := 4
else ifeq ($(CONFIG_KASAN_GENERIC), y)
KASAN_SHADOW_SCALE_SHIFT := 3
endif

KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)
KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT)

export	TEXT_OFFSET GZFLAGS

core-y		+= arch/arm64/
libs-y		:= arch/arm64/lib/ $(libs-y)
core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

# Default target when executing plain make
boot		:= arch/arm64/boot
KBUILD_IMAGE	:= $(boot)/Image.gz
KBUILD_DTBS	:= dtbs

all:	Image.gz $(KBUILD_DTBS)


Image: vmlinux
	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

Image.%: Image
	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

zinstall install:
	$(Q)$(MAKE) $(build)=$(boot) $@

%.dtb: scripts
	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@

PHONY += dtbs dtbs_install

dtbs: prepare scripts
	$(Q)$(MAKE) $(build)=$(boot)/dts

dtbs_install:
	$(Q)$(MAKE) $(dtbinst)=$(boot)/dts

PHONY += vdso_install
vdso_install:
	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
	$(if $(CONFIG_COMPAT_VDSO), \
		$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)

archprepare:
	$(Q)$(MAKE) $(build)=arch/arm64/tools kapi

# We use MRPROPER_FILES and CLEAN_FILES now
archclean:
	$(Q)$(MAKE) $(clean)=$(boot)
	$(Q)$(MAKE) $(clean)=$(boot)/dts

ifeq ($(KBUILD_EXTMOD),)
# We need to generate vdso-offsets.h before compiling certain files in kernel/.
# In order to do that, we should use the archprepare target, but we can't since
# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
# Therefore we need to generate the header after prepare0 has been made, hence
# this hack.
prepare: vdso_prepare
vdso_prepare: prepare0
	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
	$(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \
		$(build)=arch/arm64/kernel/vdso32  \
		include/generated/vdso32-offsets.h)
endif

define archhelp
  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
  echo  '* dtbs          - Build device tree blobs for enabled boards'
  echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
  echo  '  install       - Install uncompressed kernel'
  echo  '  zinstall      - Install compressed kernel'
  echo  '                  Install using (your) ~/bin/installkernel or'
  echo  '                  (distribution) /sbin/installkernel or'
  echo  '                  install to $$(INSTALL_PATH) and run lilo'
endef