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 29 ifeq ($(call gold-ifversion, -lt, 114000000, y), y) 30$(warning This version of GNU gold may generate incorrect code with --fix-cortex-a53-843419;\ 31 see https://sourceware.org/bugzilla/show_bug.cgi?id=21491) 32 endif 33LDFLAGS_vmlinux += --fix-cortex-a53-843419 34 endif 35else 36 ifeq ($(ld-name),gold) 37# Pass --no-fix-cortex-a53-843419 to ensure the erratum fix is disabled 38LDFLAGS += --no-fix-cortex-a53-843419 39 endif 40endif 41 42KBUILD_DEFCONFIG := defconfig 43 44# Check for binutils support for specific extensions 45lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1) 46 47ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y) 48 ifeq ($(lseinstr),) 49$(warning LSE atomics not supported by binutils) 50 endif 51endif 52 53ifeq ($(CONFIG_ARM64), y) 54brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1) 55 56 ifneq ($(brokengasinst),) 57$(warning Detected assembler with broken .inst; disassembly will be unreliable) 58 endif 59endif 60 61ifeq ($(cc-name),clang) 62# This is a workaround for https://bugs.llvm.org/show_bug.cgi?id=30792. 63# TODO: revert when this is fixed in LLVM. 64KBUILD_CFLAGS += -mno-implicit-float 65else 66KBUILD_CFLAGS += -mgeneral-regs-only 67endif 68KBUILD_CFLAGS += $(lseinstr) $(brokengasinst) 69KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 70KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads) 71KBUILD_CFLAGS += -fno-pic 72KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) 73 74KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 75KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 76 77ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 78KBUILD_CPPFLAGS += -mbig-endian 79CHECKFLAGS += -D__AARCH64EB__ 80AS += -EB 81LD += -EB 82ifeq ($(ld-name),gold) 83LDFLAGS += -maarch64_elf64_be_vec 84else 85LDFLAGS += -maarch64linuxb 86endif 87UTS_MACHINE := aarch64_be 88else 89KBUILD_CPPFLAGS += -mlittle-endian 90CHECKFLAGS += -D__AARCH64EL__ 91AS += -EL 92LD += -EL 93ifeq ($(ld-name),gold) 94LDFLAGS += -maarch64_elf64_le_vec 95else 96LDFLAGS += -maarch64linux 97endif 98UTS_MACHINE := aarch64 99endif 100 101CHECKFLAGS += -D__aarch64__ -m64 102 103ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y) 104KBUILD_CFLAGS_MODULE += -mcmodel=large 105ifeq ($(CONFIG_LTO_CLANG), y) 106# Code model is not stored in LLVM IR, so we need to pass it also to LLVMgold 107KBUILD_LDFLAGS_MODULE += -plugin-opt=-code-model=large 108endif 109endif 110 111ifeq ($(CONFIG_ARM64_MODULE_PLTS),y) 112KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds 113endif 114 115# Default value 116head-y := arch/arm64/kernel/head.o 117 118# The byte offset of the kernel image in RAM from the start of RAM. 119ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y) 120TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \ 121 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \ 122 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}") 123else 124TEXT_OFFSET := 0x00080000 125endif 126 127ifeq ($(cc-name),clang) 128KBUILD_CFLAGS += $(call cc-disable-warning, asm-operand-widths) 129endif 130 131# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61) 132# in 32-bit arithmetic 133KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \ 134 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \ 135 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \ 136 - (1 << (64 - 32 - 3)) )) ) 137 138export TEXT_OFFSET GZFLAGS 139 140core-y += arch/arm64/kernel/ arch/arm64/mm/ 141core-$(CONFIG_NET) += arch/arm64/net/ 142core-$(CONFIG_KVM) += arch/arm64/kvm/ 143core-$(CONFIG_XEN) += arch/arm64/xen/ 144core-$(CONFIG_CRYPTO) += arch/arm64/crypto/ 145libs-y := arch/arm64/lib/ $(libs-y) 146core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 147 148# Default target when executing plain make 149boot := arch/arm64/boot 150ifeq ($(CONFIG_BUILD_ARM64_APPENDED_DTB_IMAGE),y) 151KBUILD_IMAGE := $(boot)/$(subst $\",,$(CONFIG_BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME)) 152else 153KBUILD_IMAGE := $(boot)/Image.gz 154endif 155 156KBUILD_DTBS := dtbs 157 158all: Image.gz $(KBUILD_DTBS) $(subst $\",,$(CONFIG_BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME)) 159 160 161Image: vmlinux 162 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 163 164Image.%: Image 165 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 166 167zinstall install: 168 $(Q)$(MAKE) $(build)=$(boot) $@ 169 170%.dtb: scripts 171 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 172 173PHONY += dtbs dtbs_install 174 175dtbs: prepare scripts 176 $(Q)$(MAKE) $(build)=$(boot)/dts 177 178dtbs_install: 179 $(Q)$(MAKE) $(dtbinst)=$(boot)/dts 180 181Image-dtb: vmlinux scripts dtbs 182 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 183 184Image.gz-dtb: vmlinux scripts dtbs Image.gz 185 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 186 187PHONY += vdso_install 188vdso_install: 189 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 190 191# We use MRPROPER_FILES and CLEAN_FILES now 192archclean: 193 $(Q)$(MAKE) $(clean)=$(boot) 194 $(Q)$(MAKE) $(clean)=$(boot)/dts 195 196ifeq ($(KBUILD_EXTMOD),) 197# We need to generate vdso-offsets.h before compiling certain files in kernel/. 198# In order to do that, we should use the archprepare target, but we can't since 199# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 200# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 201# Therefore we need to generate the header after prepare0 has been made, hence 202# this hack. 203prepare: vdso_prepare 204vdso_prepare: prepare0 205 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h 206endif 207 208define archhelp 209 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 210 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 211 echo '* dtbs - Build device tree blobs for enabled boards' 212 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)' 213 echo ' install - Install uncompressed kernel' 214 echo ' zinstall - Install compressed kernel' 215 echo ' Install using (your) ~/bin/installkernel or' 216 echo ' (distribution) /sbin/installkernel or' 217 echo ' install to $$(INSTALL_PATH) and run lilo' 218endef 219