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 14CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET) 15GZFLAGS :=-9 16 17ifeq ($(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. 21LDFLAGS_vmlinux += -shared -Bsymbolic -z notext -z norelro \ 22 $(call ld-option, --no-apply-dynamic-relocs) 23endif 24 25ifeq ($(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 29LDFLAGS_vmlinux += --fix-cortex-a53-843419 30 endif 31endif 32 33KBUILD_DEFCONFIG := defconfig 34 35# Check for binutils support for specific extensions 36lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1) 37 38ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y) 39 ifeq ($(lseinstr),) 40$(warning LSE atomics not supported by binutils) 41 endif 42endif 43 44ifeq ($(CONFIG_ARM64), y) 45brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1) 46 47 ifneq ($(brokengasinst),) 48$(warning Detected assembler with broken .inst; disassembly will be unreliable) 49 endif 50endif 51 52KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) 53KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 54KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) 55 56KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 57KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 58 59ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 60prepare: stack_protector_prepare 61stack_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)) 67endif 68 69ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 70KBUILD_CPPFLAGS += -mbig-endian 71CHECKFLAGS += -D__AARCH64EB__ 72AS += -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. 75KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb) 76UTS_MACHINE := aarch64_be 77else 78KBUILD_CPPFLAGS += -mlittle-endian 79CHECKFLAGS += -D__AARCH64EL__ 80AS += -EL 81# Same as above, prefer ELF but fall back to linux target if needed. 82KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux) 83UTS_MACHINE := aarch64 84endif 85 86CHECKFLAGS += -D__aarch64__ 87 88ifeq ($(CONFIG_ARM64_MODULE_PLTS),y) 89KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds 90endif 91 92# Default value 93head-y := arch/arm64/kernel/head.o 94 95# The byte offset of the kernel image in RAM from the start of RAM. 96ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y) 97TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \ 98 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \ 99 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}") 100else 101TEXT_OFFSET := 0x00080000 102endif 103 104ifeq ($(CONFIG_KASAN_SW_TAGS), y) 105KASAN_SHADOW_SCALE_SHIFT := 4 106else 107KASAN_SHADOW_SCALE_SHIFT := 3 108endif 109 110KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 111KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 112KBUILD_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 117KASAN_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 122export TEXT_OFFSET GZFLAGS 123 124core-y += arch/arm64/kernel/ arch/arm64/mm/ 125core-$(CONFIG_NET) += arch/arm64/net/ 126core-$(CONFIG_KVM) += arch/arm64/kvm/ 127core-$(CONFIG_XEN) += arch/arm64/xen/ 128core-$(CONFIG_CRYPTO) += arch/arm64/crypto/ 129libs-y := arch/arm64/lib/ $(libs-y) 130core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 131 132# Default target when executing plain make 133boot := arch/arm64/boot 134KBUILD_IMAGE := $(boot)/Image.gz 135 136all: Image.gz 137 138 139Image: vmlinux 140 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 141 142Image.%: Image 143 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 144 145zinstall install: 146 $(Q)$(MAKE) $(build)=$(boot) $@ 147 148PHONY += vdso_install 149vdso_install: 150 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 151 152# We use MRPROPER_FILES and CLEAN_FILES now 153archclean: 154 $(Q)$(MAKE) $(clean)=$(boot) 155 156ifeq ($(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. 163prepare: vdso_prepare 164vdso_prepare: prepare0 165 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h 166endif 167 168define 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' 176endef 177