| # |
| # 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 |
| |
| ifeq ($(CONFIG_AS_HAS_ARMV8_2), y) |
| # make sure to pass the newest target architecture to -march. |
| asm-arch := armv8.2-a |
| 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 |
| |
| 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 |
