MAJOR=4
MINOR=63
DEVNAME=tty63
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# 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

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		+= -shared -Bsymbolic -z notext \
			$(call ld-option, --no-apply-dynamic-relocs)
endif

ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
  ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y)
LDFLAGS_vmlinux	+= --fix-cortex-a53-843419
  endif
endif

cc_has_k_constraint := $(call try-run,echo				\
	'int main(void) {						\
		asm volatile("and w0, w0, %w0" :: "K" (4294967295));	\
		return 0;						\
	}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)

ifeq ($(CONFIG_BROKEN_GAS_INST),y)
$(warning Detected assembler with broken .inst; disassembly will be unreliable)
endif

KBUILD_CFLAGS	+= -mgeneral-regs-only	\
		   $(compat_vdso) $(cc_has_k_constraint)
KBUILD_CFLAGS	+= $(call cc-disable-warning, psabi)
KBUILD_AFLAGS	+= $(compat_vdso)

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

# Avoid generating .eh_frame* sections.
KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables
KBUILD_AFLAGS	+= -fno-asynchronous-unwind-tables -fno-unwind-tables

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

# Ensure that if the compiler supports branch protection we default it
# off, this will be overridden if we are using branch protection.
branch-prot-flags-y += $(call cc-option,-mbranch-protection=none)

ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all
# We enable additional protection for leaf functions as there is some
# narrow potential for ROP protection benefits and no substantial
# performance impact has been observed.
ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=pac-ret+leaf+bti
else
branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf
endif
endif

KBUILD_CFLAGS += $(branch-prot-flags-y)

# Tell the assembler to support instructions from the latest target
# architecture.
#
# For non-integrated assemblers we'll pass this on the command line, and for
# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for
# inline usage.
#
# We cannot pass the same arch flag to the compiler as this would allow it to
# freely generate instructions which are not supported by earlier architecture
# versions, which would prevent a single kernel image from working on earlier
# hardware.
ifeq ($(CONFIG_AS_HAS_ARMV8_5), y)
  asm-arch := armv8.5-a
else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)
  asm-arch := armv8.4-a
else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y)
  asm-arch := armv8.3-a
else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y)
  asm-arch := armv8.2-a
endif

ifdef asm-arch
KBUILD_CFLAGS	+= -Wa,-march=$(asm-arch) \
		   -DARM64_ASM_ARCH='"$(asm-arch)"'
endif

ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
KBUILD_CFLAGS	+= -ffixed-x18
endif

ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
KBUILD_CPPFLAGS	+= -mbig-endian
CHECKFLAGS	+= -D__AARCH64EB__
# Prefer the baremetal ELF build target, but not all toolchains include
# it so fall back to the standard linux version if needed.
KBUILD_LDFLAGS	+= -EB $(call ld-opt