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 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 "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) 34 35ifeq ($(CONFIG_BROKEN_GAS_INST),y) 36$(warning Detected assembler with broken .inst; disassembly will be unreliable) 37endif 38 39KBUILD_CFLAGS += -mgeneral-regs-only \ 40 $(compat_vdso) $(cc_has_k_constraint) 41KBUILD_CFLAGS += $(call cc-disable-warning, psabi) 42KBUILD_AFLAGS += $(compat_vdso) 43 44KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) 45KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) 46 47# Avoid generating .eh_frame* sections. 48ifneq ($(CONFIG_UNWIND_TABLES),y) 49KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 50KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables 51else 52KBUILD_CFLAGS += -fasynchronous-unwind-tables 53KBUILD_AFLAGS += -fasynchronous-unwind-tables 54endif 55 56ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) 57prepare: stack_protector_prepare 58stack_protector_prepare: prepare0 59 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ 60 -mstack-protector-guard-reg=sp_el0 \ 61 -mstack-protector-guard-offset=$(shell \ 62 awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ 63 include/generated/asm-offsets.h)) 64endif 65 66# Ensure that if the compiler supports branch protection we default it 67# off, this will be overridden if we are using branch protection. 68branch-prot-flags-y += $(call cc-option,-mbranch-protection=none) 69 70ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y) 71branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all 72# We enable additional protection for leaf functions as there is some 73# narrow potential for ROP protection benefits and no substantial 74# performance impact has been observed. 75PACRET-y := pac-ret+leaf 76 77# Using a shadow call stack in leaf functions is too costly, so avoid PAC there 78# as well when we may be patching PAC into SCS 79PACRET-$(CONFIG_UNWIND_PATCH_PAC_INTO_SCS) := pac-ret 80 81ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) 82branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=$(PACRET-y)+bti 83else 84branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=$(PACRET-y) 85endif 86# -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the 87# compiler to generate them and consequently to break the single image contract 88# we pass it only to the assembler. This option is utilized only in case of non 89# integrated assemblers. 90ifeq ($(CONFIG_AS_HAS_PAC), y) 91asm-arch := armv8.3-a 92endif 93endif 94 95KBUILD_CFLAGS += $(branch-prot-flags-y) 96 97ifeq ($(CONFIG_AS_HAS_ARMV8_4), y) 98# make sure to pass the newest target architecture to -march. 99asm-arch := armv8.4-a 100endif 101 102ifeq ($(CONFIG_AS_HAS_ARMV8_5), y) 103# make sure to pass the newest target architecture to -march. 104asm-arch := armv8.5-a 105endif 106 107ifdef asm-arch 108KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ 109 -DARM64_ASM_ARCH='"$(asm-arch)"' 110endif 111 112ifeq ($(CONFIG_SHADOW_CALL_STACK), y) 113KBUILD_CFLAGS += -ffixed-x18 114endif 115 116ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) 117KBUILD_CPPFLAGS += -mbig-endian 118CHECKFLAGS += -D__AARCH64EB__ 119# Prefer the baremetal ELF build target, but not all toolchains include 120# it so fall back to the standard linux version if needed. 121KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro) 122UTS_MACHINE := aarch64_be 123else 124KBUILD_CPPFLAGS += -mlittle-endian 125CHECKFLAGS += -D__AARCH64EL__ 126# Same as above, prefer ELF but fall back to linux target if needed. 127KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro) 128UTS_MACHINE := aarch64 129endif 130 131ifeq ($(CONFIG_LD_IS_LLD), y) 132KBUILD_LDFLAGS += -z norelro 133endif 134 135CHECKFLAGS += -D__aarch64__ 136 137ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y) 138 KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY 139 CC_FLAGS_FTRACE := -fpatchable-function-entry=2 140endif 141 142# Default value 143head-y := arch/arm64/kernel/head.o 144 145ifeq ($(CONFIG_KASAN_SW_TAGS), y) 146KASAN_SHADOW_SCALE_SHIFT := 4 147else ifeq ($(CONFIG_KASAN_GENERIC), y) 148KASAN_SHADOW_SCALE_SHIFT := 3 149endif 150 151KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 152KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 153KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) 154 155libs-y := arch/arm64/lib/ $(libs-y) 156libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a 157 158# Default target when executing plain make 159boot := arch/arm64/boot 160KBUILD_IMAGE := $(boot)/Image.gz 161 162# Don't compile Image in mixed build with "all" target 163ifndef KBUILD_MIXED_TREE 164all: Image.gz 165endif 166 167 168Image: vmlinux 169 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 170 171Image.%: Image 172 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 173 174install: install-image := Image 175zinstall: install-image := Image.gz 176install zinstall: 177 $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \ 178 $(boot)/$(install-image) System.map "$(INSTALL_PATH)" 179 180PHONY += vdso_install 181vdso_install: 182 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ 183 $(if $(CONFIG_COMPAT_VDSO), \ 184 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@) 185 186archprepare: 187 $(Q)$(MAKE) $(build)=arch/arm64/tools kapi 188ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) 189 ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) 190 @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2 191 endif 192endif 193ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y) 194 ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y) 195 @echo "warning: LSE atomics not supported by binutils" >&2 196 endif 197endif 198 199 200# We use MRPROPER_FILES and CLEAN_FILES now 201archclean: 202 $(Q)$(MAKE) $(clean)=$(boot) 203 $(Q)$(MAKE) $(clean)=arch/arm64/kernel/vdso 204 $(Q)$(MAKE) $(clean)=arch/arm64/kernel/vdso32 205 206ifeq ($(CONFIG_KVM),y) 207archscripts: 208 $(Q)$(MAKE) $(build)=arch/arm64/tools gen-hyprel 209endif 210 211ifeq ($(KBUILD_EXTMOD),) 212# We need to generate vdso-offsets.h before compiling certain files in kernel/. 213# In order to do that, we should use the archprepare target, but we can't since 214# asm-offsets.h is included in some files used to generate vdso-offsets.h, and 215# asm-offsets.h is built in prepare0, for which archprepare is a dependency. 216# Therefore we need to generate the header after prepare0 has been made, hence 217# this hack. 218prepare: vdso_prepare 219vdso_prepare: prepare0 220 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \ 221 include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so 222ifdef CONFIG_COMPAT_VDSO 223 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \ 224 include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so 225endif 226endif 227 228define archhelp 229 echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' 230 echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' 231 echo ' install - Install uncompressed kernel' 232 echo ' zinstall - Install compressed kernel' 233 echo ' Install using (your) ~/bin/installkernel or' 234 echo ' (distribution) /sbin/installkernel or' 235 echo ' install to $$(INSTALL_PATH) and run lilo' 236endef 237