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 \ 20 $(call ld-option, --no-apply-dynamic-relocs) 21endif 22 23ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 24 ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) 25LDFLAGS_vmlinux += --fix-cortex-a53-843419 26 endif 27endif 28 29cc_has_k_constraint := $(call try-run,echo \ 30 'int main(void) { \ 31 asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \ 32 return 0; \ 33 }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) 34 35ifeq ($(CONFIG_BROKEN_GAS_INST),y) 36$(warning Detected assembler with broken .inst; disassembly will be unreliable) 37endif 38 39# The GCC option -ffreestanding is required in order to compile code containing 40# ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel) 41CC_FLAGS_FPU := -ffreestanding 42# Enable <arm_neon.h> 43CC_FLAGS_FPU += -isystem $(shell $(CC) -print-file-name=include) 44CC_FLAGS_NO_FPU := -mgeneral-regs-only 45 46KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU) \ 47 $(compat_vdso) $(cc_has_k_constraint) 48KBUILD_CFLAGS += $(call cc-disable-warning, psabi) 49KBUILD_AFLAGS += $(compat_vdso) 50 51ifeq ($(call rustc-min-version, 108500),y) 52KBUILD_RUSTFLAGS += --target=aarch64-unknown-none-softfloat 53else 54KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon" 55endif 56 57KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 58KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 59 60# Avoid generating .eh_frame* sections. 61ifneq ($(CONFIG_UNWIND_TABLES),y) 62KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 63KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 64KBUILD_RUSTFLAGS += -Cforce-unwind-tables=n 65else 66KBUILD_CFLAGS += -fasynchronous-unwind-tables 67KBUILD_AFLAGS += -fasynchronous-unwind-tables 68KBUILD_RUSTFLAGS += -Cforce-unwind-tables=y -Zuse-sync-unwind=n 69endif 70 71ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 72prepare: stack_protector_prepare 73stack_protector_prepare: prepare0 74 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 75 -mstack-protector-guard-reg=sp_el0 \ 76 -mstack-protector-guard-offset=$(shell \ 77 awk '{if ($$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 ifeq ($(CONFIG_AS_HAS_ARMV8_4), y) 109 asm-arch := armv8.4-a 110else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y) 111 asm-arch := armv8.3-a 112else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y) 113 asm-arch := armv8.2-a 114endif 115 116ifdef asm-arch 117KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ 118 -DARM64_ASM_ARCH='"$(asm-arch)"' 119endif 120 121ifeq ($(CONFIG_SHADOW_CALL_STACK), y) 122KBUILD_CFLAGS += -ffixed-x18 123KBUILD_RUSTFLAGS += -Zfixed-x18 124endif 125 126ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 127KBUILD_CPPFLAGS += -mbig-endian 128CHECKFLAGS += -D__AARCH64EB__ 129# Prefer the baremetal ELF build target, but not all toolchains include 130# it so fall back to the standard linux version if needed. 131KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro) 132UTS_MACHINE := aarch64_be 133else 134KBUILD_CPPFLAGS += -mlittle-endian 135CHECKFLAGS += -D__AARCH64EL__ 136# Same as above, prefer ELF but fall back to linux target if needed. 137KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro) 138UTS_MACHINE := aarch64 139endif 140 141ifeq ($(CONFIG_LD_IS_LLD), y) 142KBUILD_LDFLAGS += -z norelro 143endif 144 145CHECKFLAGS += -D__aarch64__ 146 147ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y) 148 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 149 CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2 150else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y) 151 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 152 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 153endif 154 155ifeq ($(CONFIG_KASAN_SW_TAGS), y) 156KASAN_SHADOW_SCALE_SHIFT := 4 157else ifeq ($(CONFIG_KASAN_GENERIC), y) 158KASAN_SHADOW_SCALE_SHIFT := 3 159endif 160 161KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 162KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 163KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 164 165libs-y := arch/arm64/lib/ $(libs-y) 166libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 167 168# Default target when executing plain make 169boot := arch/arm64/boot 170 171BOOT_TARGETS := Image vmlinuz.efi image.fit 172 173PHONY += $(BOOT_TARGETS) 174 175ifeq ($(CONFIG_EFI_ZBOOT),) 176KBUILD_IMAGE := $(boot)/Image.gz 177else 178KBUILD_IMAGE := $(boot)/vmlinuz.efi 179endif 180 181# Don't compile Image in mixed build with "all" target 182ifndef KBUILD_MIXED_TREE 183all: $(notdir $(KBUILD_IMAGE)) 184endif 185 186image.fit: dtbs 187 188vmlinuz.efi image.fit: Image 189$(BOOT_TARGETS): vmlinux 190 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 191 192Image.%: Image 193 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 194 195ifeq ($(CONFIG_COMPRESSED_INSTALL),y) 196 DEFAULT_KBUILD_IMAGE = $(KBUILD_IMAGE) 197else 198 DEFAULT_KBUILD_IMAGE = $(boot)/Image 199endif 200 201install: KBUILD_IMAGE := $(DEFAULT_KBUILD_IMAGE) 202install zinstall: 203 $(call cmd,install) 204 205archprepare: 206 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi 207ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 208 ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) 209 @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2 210 endif 211endif 212ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y) 213 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y) 214 @echo "warning: LSE atomics not supported by binutils" >&2 215 endif 216endif 217 218ifeq ($(CONFIG_KVM),y) 219archscripts: 220 $(Q)$(MAKE) $(build)=arch/arm64/tools gen-hyprel 221endif 222 223ifeq ($(KBUILD_EXTMOD),) 224# We need to generate vdso-offsets.h before compiling certain files in kernel/. 225# In order to do that, we should use the archprepare target, but we can't since 226# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 227# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 228# Therefore we need to generate the header after prepare0 has been made, hence 229# this hack. 230prepare: vdso_prepare 231vdso_prepare: prepare0 232 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \ 233 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so 234ifdef CONFIG_COMPAT_VDSO 235 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \ 236 arch/arm64/kernel/vdso32/vdso.so 237endif 238endif 239 240vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg 241vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso32.so.dbg 242 243include $(srctree)/scripts/Makefile.defconf 244 245PHONY += virtconfig 246virtconfig: 247 $(call merge_into_defconfig_override,defconfig,virt) 248 249define archhelp 250 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 251 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 252 echo ' image.fit - Flat Image Tree (arch/$(ARCH)/boot/image.fit)' 253 echo ' install - Install kernel (compressed if COMPRESSED_INSTALL set)' 254 echo ' zinstall - Install compressed kernel' 255 echo ' Install using (your) ~/bin/installkernel or' 256 echo ' (distribution) /sbin/installkernel or' 257 echo ' install to $$(INSTALL_PATH) and run lilo' 258endef 259