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 --pic-veneer 14 15ifeq ($(CONFIG_RELOCATABLE), y) 16# Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour 17# for relative relocs, since this leads to better Image compression 18# with the relocation offsets always being zero. 19LDFLAGS_vmlinux += -shared -Bsymbolic -z notext --no-apply-dynamic-relocs 20endif 21 22ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 23LDFLAGS_vmlinux += --fix-cortex-a53-843419 24endif 25 26cc_has_k_constraint := $(call try-run,echo \ 27 'int main(void) { \ 28 asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \ 29 return 0; \ 30 }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) 31 32ifeq ($(CONFIG_BROKEN_GAS_INST),y) 33$(warning Detected assembler with broken .inst; disassembly will be unreliable) 34endif 35 36# The GCC option -ffreestanding is required in order to compile code containing 37# ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel) 38CC_FLAGS_FPU := -ffreestanding 39# Enable <arm_neon.h> 40CC_FLAGS_FPU += -isystem $(shell $(CC) -print-file-name=include) 41CC_FLAGS_NO_FPU := -mgeneral-regs-only 42 43KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU) \ 44 $(compat_vdso) $(cc_has_k_constraint) 45KBUILD_CFLAGS += $(call cc-disable-warning, psabi) 46KBUILD_AFLAGS += $(compat_vdso) 47 48ifeq ($(call rustc-min-version, 108500),y) 49KBUILD_RUSTFLAGS += --target=aarch64-unknown-none-softfloat 50else 51KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon" 52endif 53 54KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 55KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 56 57# Avoid generating .eh_frame* sections. 58ifneq ($(CONFIG_UNWIND_TABLES),y) 59KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 60KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 61KBUILD_RUSTFLAGS += -Cforce-unwind-tables=n 62else 63KBUILD_CFLAGS += -fasynchronous-unwind-tables 64KBUILD_AFLAGS += -fasynchronous-unwind-tables 65KBUILD_RUSTFLAGS += -Cforce-unwind-tables=y -Zuse-sync-unwind=n 66# Work around rustc bug on compilers without 67# https://github.com/rust-lang/rust/pull/156973. 68KBUILD_RUSTFLAGS += $(if $(call rustc-min-version,109800),,-Zllvm_module_flag=uwtable:u32:2:max) 69endif 70 71ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 72prepare: stack_protector_prepare 73stack_protector_prepare: prepare0 74 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 75 -mstack-protector-guard-reg=sp_el0 \ 76 -mstack-protector-guard-offset=$(shell \ 77 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 78 $(objtree)/include/generated/asm-offsets.h)) 79endif 80 81ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) 82 KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti 83 KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret 84else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y) 85 KBUILD_RUSTFLAGS += -Zbranch-protection=pac-ret 86 ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y) 87 KBUILD_CFLAGS += -mbranch-protection=pac-ret 88 else 89 KBUILD_CFLAGS += -msign-return-address=non-leaf 90 endif 91else 92 KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none) 93endif 94 95# Tell the assembler to support instructions from the latest target 96# architecture. 97# 98# For non-integrated assemblers we'll pass this on the command line, and for 99# integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for 100# inline usage. 101# 102# We cannot pass the same arch flag to the compiler as this would allow it to 103# freely generate instructions which are not supported by earlier architecture 104# versions, which would prevent a single kernel image from working on earlier 105# hardware. 106ifeq ($(CONFIG_AS_HAS_ARMV8_5), y) 107 asm-arch := armv8.5-a 108else 109 asm-arch := armv8.4-a 110endif 111 112ifdef asm-arch 113KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ 114 -DARM64_ASM_ARCH='"$(asm-arch)"' 115endif 116 117ifeq ($(CONFIG_SHADOW_CALL_STACK), y) 118KBUILD_CFLAGS += -ffixed-x18 119KBUILD_RUSTFLAGS += -Zfixed-x18 120endif 121 122KBUILD_CPPFLAGS += -mlittle-endian 123CHECKFLAGS += -D__AARCH64EL__ 124# Prefer the baremetal ELF build target, but not all toolchains include 125# it so fall back to the standard linux version if needed. 126KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro) 127UTS_MACHINE := aarch64 128 129ifeq ($(CONFIG_LD_IS_LLD), y) 130KBUILD_LDFLAGS += -z norelro 131endif 132 133CHECKFLAGS += -D__aarch64__ 134 135ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y) 136 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 137 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2 138else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y) 139 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 140 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 141endif 142 143ifeq ($(CONFIG_KASAN_SW_TAGS), y) 144KASAN_SHADOW_SCALE_SHIFT := 4 145else ifeq ($(CONFIG_KASAN_GENERIC), y) 146KASAN_SHADOW_SCALE_SHIFT := 3 147endif 148 149KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 150KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 151KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 152 153libs-y := arch/arm64/lib/ $(libs-y) 154libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 155 156# Default target when executing plain make 157boot := arch/arm64/boot 158 159BOOT_TARGETS := Image vmlinuz.efi image.fit 160 161PHONY += $(BOOT_TARGETS) 162 163ifeq ($(CONFIG_EFI_ZBOOT),) 164KBUILD_IMAGE := $(boot)/Image.gz 165else 166KBUILD_IMAGE := $(boot)/vmlinuz.efi 167endif 168 169all: $(notdir $(KBUILD_IMAGE)) 170 171image.fit: dtbs 172 173vmlinuz.efi image.fit: Image 174$(BOOT_TARGETS): vmlinux 175 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 176 177Image.%: Image 178 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 179 180ifeq ($(CONFIG_COMPRESSED_INSTALL),y) 181 DEFAULT_KBUILD_IMAGE = $(KBUILD_IMAGE) 182else 183 DEFAULT_KBUILD_IMAGE = $(boot)/Image 184endif 185 186install: KBUILD_IMAGE := $(DEFAULT_KBUILD_IMAGE) 187install zinstall: 188 $(call cmd,install) 189 190archprepare: 191 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi 192 193ifeq ($(KBUILD_EXTMOD),) 194# We need to generate vdso-offsets.h before compiling certain files in kernel/. 195# In order to do that, we should use the archprepare target, but we can't since 196# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 197# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 198# Therefore we need to generate the header after prepare0 has been made, hence 199# this hack. 200prepare: vdso_prepare 201vdso_prepare: prepare0 202 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \ 203 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so 204ifdef CONFIG_COMPAT_VDSO 205 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \ 206 arch/arm64/kernel/vdso32/vdso.so 207endif 208endif 209 210vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg 211vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso32.so.dbg 212 213include $(srctree)/scripts/Makefile.defconf 214 215PHONY += virtconfig 216virtconfig: 217 $(call merge_into_defconfig_override,defconfig,virt) 218 219define archhelp 220 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 221 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 222 echo ' image.fit - Flat Image Tree (arch/$(ARCH)/boot/image.fit)' 223 echo ' install - Install kernel (compressed if COMPRESSED_INSTALL set)' 224 echo ' zinstall - Install compressed kernel' 225 echo ' Install using (your) ~/bin/installkernel or' 226 echo ' (distribution) /sbin/installkernel or' 227 echo ' install to $$(INSTALL_PATH) and run lilo' 228endef 229