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