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 :=-p --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 59KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128) 60 61ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 62KBUILD_CPPFLAGS += -mbig-endian 63CHECKFLAGS += -D__AARCH64EB__ 64AS += -EB 65LD += -EB 66LDFLAGS += -maarch64linuxb 67UTS_MACHINE := aarch64_be 68else 69KBUILD_CPPFLAGS += -mlittle-endian 70CHECKFLAGS += -D__AARCH64EL__ 71AS += -EL 72LD += -EL 73LDFLAGS += -maarch64linux 74UTS_MACHINE := aarch64 75endif 76 77CHECKFLAGS += -D__aarch64__ -m64 78 79ifeq ($(CONFIG_ARM64_MODULE_PLTS),y) 80KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds 81endif 82 83# Default value 84head-y := arch/arm64/kernel/head.o 85 86# The byte offset of the kernel image in RAM from the start of RAM. 87ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y) 88TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \ 89 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \ 90 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}") 91else 92TEXT_OFFSET := 0x00080000 93endif 94 95# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT)) 96# - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) 97# in 32-bit arithmetic 98KASAN_SHADOW_SCALE_SHIFT := 3 99KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \ 100 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \ 101 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \ 102 - (1 << (64 - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) )) ) 103 104export TEXT_OFFSET GZFLAGS 105 106core-y += arch/arm64/kernel/ arch/arm64/mm/ 107core-$(CONFIG_NET) += arch/arm64/net/ 108core-$(CONFIG_KVM) += arch/arm64/kvm/ 109core-$(CONFIG_XEN) += arch/arm64/xen/ 110core-$(CONFIG_CRYPTO) += arch/arm64/crypto/ 111libs-y := arch/arm64/lib/ $(libs-y) 112core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 113 114# Default target when executing plain make 115boot := arch/arm64/boot 116KBUILD_IMAGE := $(boot)/Image.gz 117KBUILD_DTBS := dtbs 118 119all: Image.gz $(KBUILD_DTBS) 120 121 122Image: vmlinux 123 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 124 125Image.%: Image 126 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 127 128zinstall install: 129 $(Q)$(MAKE) $(build)=$(boot) $@ 130 131%.dtb: scripts 132 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 133 134PHONY += dtbs dtbs_install 135 136dtbs: prepare scripts 137 $(Q)$(MAKE) $(build)=$(boot)/dts 138 139dtbs_install: 140 $(Q)$(MAKE) $(dtbinst)=$(boot)/dts 141 142PHONY += vdso_install 143vdso_install: 144 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 145 146# We use MRPROPER_FILES and CLEAN_FILES now 147archclean: 148 $(Q)$(MAKE) $(clean)=$(boot) 149 $(Q)$(MAKE) $(clean)=$(boot)/dts 150 151# We need to generate vdso-offsets.h before compiling certain files in kernel/. 152# In order to do that, we should use the archprepare target, but we can't since 153# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 154# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 155# Therefore we need to generate the header after prepare0 has been made, hence 156# this hack. 157prepare: vdso_prepare 158vdso_prepare: prepare0 159 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h 160 161define archhelp 162 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 163 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 164 echo '* dtbs - Build device tree blobs for enabled boards' 165 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)' 166 echo ' install - Install uncompressed kernel' 167 echo ' zinstall - Install compressed kernel' 168 echo ' Install using (your) ~/bin/installkernel or' 169 echo ' (distribution) /sbin/installkernel or' 170 echo ' install to $$(INSTALL_PATH) and run lilo' 171endef 172