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# # arch/arm64/Makefile # # This file is included by the global makefile so that you can add your own # architecture-specific flags and dependencies. # # This file is subject to the terms and conditions of the GNU General Public # License. See the file "COPYING" in the main directory of this archive # for more details. # # Copyright (C) 1995-2001 by Russell King LDFLAGS_vmlinux :=--no-undefined -X ifeq ($(CONFIG_RELOCATABLE), y) # Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour # for relative relocs, since this leads to better Image compression # with the relocation offsets always being zero. LDFLAGS_vmlinux += -shared -Bsymbolic -z notext \ $(call ld-option, --no-apply-dynamic-relocs) endif ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) ifeq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) LDFLAGS_vmlinux += --fix-cortex-a53-843419 endif endif cc_has_k_constraint := $(call try-run,echo \ 'int main(void) { \ asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \ return 0; \ }' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1) ifeq ($(CONFIG_BROKEN_GAS_INST),y) $(warning Detected assembler with broken .inst; disassembly will be unreliable) endif KBUILD_CFLAGS += -mgeneral-regs-only \ $(compat_vdso) $(cc_has_k_constraint) KBUILD_CFLAGS += $(call cc-disable-warning, psabi) KBUILD_AFLAGS += $(compat_vdso) KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) # Avoid generating .eh_frame* sections. KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) prepare: stack_protector_prepare stack_protector_prepare: prepare0 $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ -mstack-protector-guard-reg=sp_el0 \ -mstack-protector-guard-offset=$(shell \ awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ include/generated/asm-offsets.h)) endif # Ensure that if the compiler supports branch protection we default it # off, this will be overridden if we are using branch protection. branch-prot-flags-y += $(call cc-option,-mbranch-protection=none) ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y) branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all # We enable additional protection for leaf functions as there is some # narrow potential for ROP protection benefits and no substantial # performance impact has been observed. ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=pac-ret+leaf+bti else branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=pac-ret+leaf endif # -march=armv8.3-a enables the non-nops instructions for PAC, to avoid the # compiler to generate them and consequently to break the single image contract # we pass it only to the assembler. This option is utilized only in case of non # integrated assemblers. ifeq ($(CONFIG_AS_HAS_PAC), y) asm-arch := armv8.3-a endif endif KBUILD_CFLAGS += $(branch-prot-flags-y) ifeq ($(CONFIG_AS_HAS_ARMV8_4), y) # make sure to pass the newest target architecture to -march. asm-arch := armv8.4-a endif ifeq ($(CONFIG_AS_HAS_ARMV8_5), y) # make sure to pass the newest target architecture to -march. asm-arch := armv8.5-a endif ifdef asm-arch KBUILD_CFLAGS += -Wa,-march=$(asm-arch) \ -DARM64_ASM_ARCH='"$(asm-arch)"' endif ifeq ($(CONFIG_SHADOW_CALL_STACK), y) KBUILD_CFLAGS += -ffixed-x18 endif ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) KBUILD_CPPFLAGS += -mbig-endian CHECKFLAGS += -D__AARCH64EB__ # Prefer the baremetal ELF build target, but not all toolchains include # it so fall back to the standard linux version if needed. KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro) UTS_MACHINE := aarch64_be else KBUILD_CPPFLAGS += -mlittle-endian CHECKFLAGS += -D__AARCH64EL__ # Same as above, prefer ELF but fall back to linux target if needed. KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro) UTS_MACHINE := aarch64 endif ifeq ($(CONFIG_LD_IS_LLD), y) KBUILD_LDFLAGS += -z norelro endif CHECKFLAGS += -D__aarch64__ ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y) KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY CC_FLAGS_FTRACE := -fpatchable-function-entry=2 endif # Default value head-y := arch/arm64/kernel/head.o ifeq ($(CONFIG_KASAN_SW_TAGS), y) KASAN_SHADOW_SCALE_SHIFT := 4 else ifeq ($(CONFIG_KASAN_GENERIC), y) KASAN_SHADOW_SCALE_SHIFT := 3 endif KBUILD_CFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) KBUILD_CPPFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) KBUILD_AFLAGS += -DKASAN_SHADOW_SCALE_SHIFT=$(KASAN_SHADOW_SCALE_SHIFT) libs-y := arch/arm64/lib/ $(libs-y) libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a # Default target when executing plain make boot := arch/arm64/boot KBUILD_IMAGE := $(boot)/Image.gz all: Image.gz Image: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ Image.%: Image $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ install: install-image := Image zinstall: install-image := Image.gz install zinstall: $(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \ $(boot)/$(install-image) System.map "$(INSTALL_PATH)" PHONY += vdso_install vdso_install: $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@ $(if $(CONFIG_COMPAT_VDSO), \ $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@) archprepare: $(Q)$(MAKE) $(build)=arch/arm64/tools kapi ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) ifneq ($(CONFIG_ARM64_LD_HAS_FIX_ERRATUM_843419),y) @echo "warning: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum" >&2 endif endif ifeq ($(CONFIG_ARM64_USE_LSE_ATOMICS),y) ifneq ($(CONFIG_ARM64_LSE_ATOMICS),y) @echo "warning: LSE atomics not supported by binutils" >&2 endif endif # We use MRPROPER_FILES and CLEAN_FILES now archclean: $(Q)$(MAKE) $(clean)=$(boot) $(Q)$(MAKE) $(clean)=arch/arm64/kernel/vdso $(Q)$(MAKE) $(clean)=arch/arm64/kernel/vdso32 ifeq ($(KBUILD_EXTMOD),) # We need to generate vdso-offsets.h before compiling certain files in kernel/. # In order to do that, we should use the archprepare target, but we can't since # asm-offsets.h is included in some files used to generate vdso-offsets.h, and # asm-offsets.h is built in prepare0, for which archprepare is a dependency. # Therefore we need to generate the header after prepare0 has been made, hence # this hack. prepare: vdso_prepare vdso_prepare: prepare0 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso \ include/generated/vdso-offsets.h arch/arm64/kernel/vdso/vdso.so ifdef CONFIG_COMPAT_VDSO $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 \ include/generated/vdso32-offsets.h arch/arm64/kernel/vdso32/vdso.so endif endif define archhelp echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' echo ' install - Install uncompressed kernel' echo ' zinstall - Install compressed kernel' echo ' Install using (your) ~/bin/installkernel or' echo ' (distribution) /sbin/installkernel or' echo ' install to $$(INSTALL_PATH) and run lilo' endef