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_CFLAGS += $(call cc-disable-warning, psabi) 55KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) 56 57KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 58KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 59 60ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 61prepare: stack_protector_prepare 62stack_protector_prepare: prepare0 63 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 64 -mstack-protector-guard-reg=sp_el0 \ 65 -mstack-protector-guard-offset=$(shell \ 66 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 67 include/generated/asm-offsets.h)) 68endif 69 70ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 71KBUILD_CPPFLAGS += -mbig-endian 72CHECKFLAGS += -D__AARCH64EB__ 73AS += -EB 74# Prefer the baremetal ELF build target, but not all toolchains include 75# it so fall back to the standard linux version if needed. 76KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb) 77UTS_MACHINE := aarch64_be 78else 79KBUILD_CPPFLAGS += -mlittle-endian 80CHECKFLAGS += -D__AARCH64EL__ 81AS += -EL 82# Same as above, prefer ELF but fall back to linux target if needed. 83KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux) 84UTS_MACHINE := aarch64 85endif 86 87CHECKFLAGS += -D__aarch64__ 88 89ifeq ($(CONFIG_ARM64_MODULE_PLTS),y) 90KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds 91endif 92 93# Default value 94head-y := arch/arm64/kernel/head.o 95 96# The byte offset of the kernel image in RAM from the start of RAM. 97ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y) 98TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \ 99 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \ 100 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}") 101else 102TEXT_OFFSET := 0x00080000 103endif 104 105ifeq ($(CONFIG_KASAN_SW_TAGS), y) 106KASAN_SHADOW_SCALE_SHIFT := 4 107else 108KASAN_SHADOW_SCALE_SHIFT := 3 109endif 110 111KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 112KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 113KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 114 115# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT)) 116# - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) 117# in 32-bit arithmetic 118KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \ 119 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \ 120 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \ 121 - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) ) 122 123export TEXT_OFFSET GZFLAGS 124 125core-y += arch/arm64/kernel/ arch/arm64/mm/ 126core-$(CONFIG_NET) += arch/arm64/net/ 127core-$(CONFIG_KVM) += arch/arm64/kvm/ 128core-$(CONFIG_XEN) += arch/arm64/xen/ 129core-$(CONFIG_CRYPTO) += arch/arm64/crypto/ 130libs-y := arch/arm64/lib/ $(libs-y) 131core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 132 133# Default target when executing plain make 134boot := arch/arm64/boot 135KBUILD_IMAGE := $(boot)/Image.gz 136 137all: Image.gz 138 139 140Image: vmlinux 141 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 142 143Image.%: Image 144 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 145 146zinstall install: 147 $(Q)$(MAKE) $(build)=$(boot) $@ 148 149PHONY += vdso_install 150vdso_install: 151 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 152 153# We use MRPROPER_FILES and CLEAN_FILES now 154archclean: 155 $(Q)$(MAKE) $(clean)=$(boot) 156 157ifeq ($(KBUILD_EXTMOD),) 158# We need to generate vdso-offsets.h before compiling certain files in kernel/. 159# In order to do that, we should use the archprepare target, but we can't since 160# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 161# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 162# Therefore we need to generate the header after prepare0 has been made, hence 163# this hack. 164prepare: vdso_prepare 165vdso_prepare: prepare0 166 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h 167endif 168 169define archhelp 170 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 171 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 172 echo ' install - Install uncompressed kernel' 173 echo ' zinstall - Install compressed kernel' 174 echo ' Install using (your) ~/bin/installkernel or' 175 echo ' (distribution) /sbin/installkernel or' 176 echo ' install to $$(INSTALL_PATH) and run lilo' 177endef 178