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 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 ($(cc-name),clang) 54# This is a workaround for https://bugs.llvm.org/show_bug.cgi?id=30792. 55# TODO: revert when this is fixed in LLVM. 56KBUILD_CFLAGS += -mno-implicit-float 57else 58KBUILD_CFLAGS += -mgeneral-regs-only 59endif 60KBUILD_CFLAGS += $(lseinstr) 61KBUILD_CFLAGS += -fno-asynchronous-unwind-tables 62KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads) 63KBUILD_CFLAGS += -fno-pic 64KBUILD_AFLAGS += $(lseinstr) 65 66ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 67KBUILD_CPPFLAGS += -mbig-endian 68AS += -EB 69LD += -EB 70UTS_MACHINE := aarch64_be 71else 72KBUILD_CPPFLAGS += -mlittle-endian 73AS += -EL 74LD += -EL 75UTS_MACHINE := aarch64 76endif 77 78CHECKFLAGS += -D__aarch64__ 79 80ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y) 81KBUILD_CFLAGS_MODULE += -mcmodel=large 82ifeq ($(CONFIG_LTO_CLANG), y) 83# Code model is not stored in LLVM IR, so we need to pass it also to LLVMgold 84LDFLAGS += -plugin-opt=-code-model=large 85endif 86endif 87 88ifeq ($(CONFIG_ARM64_MODULE_PLTS),y) 89KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/arm64/kernel/module.lds 90endif 91 92# Default value 93head-y := arch/arm64/kernel/head.o 94 95# The byte offset of the kernel image in RAM from the start of RAM. 96ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y) 97TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \ 98 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \ 99 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}") 100else 101TEXT_OFFSET := 0x00080000 102endif 103 104ifeq ($(cc-name),clang) 105KBUILD_CFLAGS += $(call cc-disable-warning, asm-operand-widths) 106endif 107 108# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61) 109# in 32-bit arithmetic 110KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \ 111 (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \ 112 + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \ 113 - (1 << (64 - 32 - 3)) )) ) 114 115export TEXT_OFFSET GZFLAGS 116 117core-y += arch/arm64/kernel/ arch/arm64/mm/ 118core-$(CONFIG_NET) += arch/arm64/net/ 119core-$(CONFIG_KVM) += arch/arm64/kvm/ 120core-$(CONFIG_XEN) += arch/arm64/xen/ 121core-$(CONFIG_CRYPTO) += arch/arm64/crypto/ 122libs-y := arch/arm64/lib/ $(libs-y) 123core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 124 125# Default target when executing plain make 126ifeq ($(CONFIG_BUILD_ARM64_APPENDED_DTB_IMAGE),y) 127KBUILD_IMAGE := $(subst $\",,$(CONFIG_BUILD_ARM64_APPENDED_KERNEL_IMAGE_NAME)) 128else 129KBUILD_IMAGE := Image.gz 130endif 131 132KBUILD_DTBS := dtbs 133 134all: $(KBUILD_IMAGE) $(KBUILD_DTBS) 135 136boot := arch/arm64/boot 137 138Image: vmlinux 139 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 140 141Image.%: Image 142 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 143 144zinstall install: 145 $(Q)$(MAKE) $(build)=$(boot) $@ 146 147%.dtb: scripts 148 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 149 150PHONY += dtbs dtbs_install 151 152dtbs: prepare scripts 153 $(Q)$(MAKE) $(build)=$(boot)/dts 154 155dtbs_install: 156 $(Q)$(MAKE) $(dtbinst)=$(boot)/dts 157 158Image-dtb Image.gz-dtb: vmlinux scripts dtbs 159 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 160 161PHONY += vdso_install 162vdso_install: 163 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 164 165# We use MRPROPER_FILES and CLEAN_FILES now 166archclean: 167 $(Q)$(MAKE) $(clean)=$(boot) 168 $(Q)$(MAKE) $(clean)=$(boot)/dts 169 170# We need to generate vdso-offsets.h before compiling certain files in kernel/. 171# In order to do that, we should use the archprepare target, but we can't since 172# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 173# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 174# Therefore we need to generate the header after prepare0 has been made, hence 175# this hack. 176prepare: vdso_prepare 177vdso_prepare: prepare0 178 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h 179 180define archhelp 181 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 182 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 183 echo '* dtbs - Build device tree blobs for enabled boards' 184 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)' 185 echo ' install - Install uncompressed kernel' 186 echo ' zinstall - Install compressed kernel' 187 echo ' Install using (your) ~/bin/installkernel or' 188 echo ' (distribution) /sbin/installkernel or' 189 echo ' install to $$(INSTALL_PATH) and run lilo' 190endef 191