linux-yocto/arch/arm64/Makefile

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 --pic-veneer

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

The GCC option -ffreestanding is required in order to compile code containing

ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel)

CC_FLAGS_FPU := -ffreestanding

Enable <arm_neon.h>

CC_FLAGS_FPU += -isystem $(shell $(CC) -print-file-name=include) CC_FLAGS_NO_FPU := -mgeneral-regs-only

KBUILD_CFLAGS += $(CC_FLAGS_NO_FPU)
$(compat_vdso) $(cc_has_k_constraint) KBUILD_CFLAGS += $(call cc-disable-warning, psabi) KBUILD_AFLAGS += $(compat_vdso)

KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"

KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)

Avoid generating .eh_frame* sections.

ifneq ($(CONFIG_UNWIND_TABLES),y) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables KBUILD_AFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables KBUILD_RUSTFLAGS += -Cforce-unwind-tables=n else KBUILD_CFLAGS += -fasynchronous-unwind-tables KBUILD_AFLAGS += -fasynchronous-unwind-tables KBUILD_RUSTFLAGS += -Cforce-unwind-tables=y -Zuse-sync-unwind=n endif

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;}'
$(objtree)/include/generated/asm-offsets.h)) endif

ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y) KBUILD_RUSTFLAGS += -Zbranch-protection=pac-ret ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y) KBUILD_CFLAGS += -mbranch-protection=pac-ret else KBUILD_CFLAGS += -msign-return-address=non-leaf endif else KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none) endif

Tell the assembler to support instructions from the latest target

architecture.

For non-integrated assemblers we'll pass this on the command line, and for

integrated assemblers we'll define ARM64_ASM_ARCH and ARM64_ASM_PREAMBLE for

inline usage.

We cannot pass the same arch flag to the compiler as this would allow it to

freely generate instructions which are not supported by earlier architecture

versions, which would prevent a single kernel image from working on earlier

hardware.

ifeq ($(CONFIG_AS_HAS_ARMV8_5), y) asm-arch := armv8.5-a else ifeq ($(CONFIG_AS_HAS_ARMV8_4), y) asm-arch := armv8.4-a else ifeq ($(CONFIG_AS_HAS_ARMV8_3), y) asm-arch := armv8.3-a else ifeq ($(CONFIG_AS_HAS_ARMV8_2), y) asm-arch := armv8.2-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 KBUILD_RUSTFLAGS += -Zfixed-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 ($(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS),y) KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2 else ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_ARGS),y) KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY CC_FLAGS_FTRACE := -fpatchable-function-entry=2 endif

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

BOOT_TARGETS := Image vmlinuz.efi image.fit

PHONY += $(BOOT_TARGETS)

ifeq ($(CONFIG_EFI_ZBOOT),) KBUILD_IMAGE := $(boot)/Image.gz else KBUILD_IMAGE := $(boot)/vmlinuz.efi endif

all: $(notdir $(KBUILD_IMAGE))

image.fit: dtbs

vmlinuz.efi image.fit: Image $(BOOT_TARGETS): vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

Image.%: Image $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@

ifeq ($(CONFIG_COMPRESSED_INSTALL),y) DEFAULT_KBUILD_IMAGE = $(KBUILD_IMAGE) else DEFAULT_KBUILD_IMAGE = $(boot)/Image endif

install: KBUILD_IMAGE := $(DEFAULT_KBUILD_IMAGE) install zinstall: $(call cmd,install)

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
arch/arm64/kernel/vdso32/vdso.so endif endif

vdso-install-y += arch/arm64/kernel/vdso/vdso.so.dbg vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso32.so.dbg

include $(srctree)/scripts/Makefile.defconf

PHONY += virtconfig virtconfig: $(call merge_into_defconfig_override,defconfig,virt)

define archhelp echo '* Image.gz - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)' echo ' Image - Uncompressed kernel image (arch/$(ARCH)/boot/Image)' echo ' image.fit - Flat Image Tree (arch/$(ARCH)/boot/image.fit)' echo ' install - Install kernel (compressed if COMPRESSED_INSTALL set)' 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