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