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linux-yocto/arch/arm64/Makefile
Linus Torvalds 8afc66e8d4 Kbuild updates for v6.1 
- Remove potentially incomplete targets when Kbuid is interrupted by
    SIGINT etc. in case GNU Make may miss to do that when stderr is piped
    to another program.
 
  - Rewrite the single target build so it works more correctly.
 
  - Fix rpm-pkg builds with V=1.
 
  - List top-level subdirectories in ./Kbuild.
 
  - Ignore auto-generated __kstrtab_* and __kstrtabns_* symbols in kallsyms.
 
  - Avoid two different modules in lib/zstd/ having shared code, which
    potentially causes building the common code as build-in and modular
    back-and-forth.
 
  - Unify two modpost invocations to optimize the build process.
 
  - Remove head-y syntax in favor of linker scripts for placing particular
    sections in the head of vmlinux.
 
  - Bump the minimal GNU Make version to 3.82.
 
  - Clean up misc Makefiles and scripts.
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Merge tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Remove potentially incomplete targets when Kbuid is interrupted by
   SIGINT etc in case GNU Make may miss to do that when stderr is piped
   to another program.

 - Rewrite the single target build so it works more correctly.

 - Fix rpm-pkg builds with V=1.

 - List top-level subdirectories in ./Kbuild.

 - Ignore auto-generated __kstrtab_* and __kstrtabns_* symbols in
   kallsyms.

 - Avoid two different modules in lib/zstd/ having shared code, which
   potentially causes building the common code as build-in and modular
   back-and-forth.

 - Unify two modpost invocations to optimize the build process.

 - Remove head-y syntax in favor of linker scripts for placing
   particular sections in the head of vmlinux.

 - Bump the minimal GNU Make version to 3.82.

 - Clean up misc Makefiles and scripts.

* tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (41 commits)
  docs: bump minimal GNU Make version to 3.82
  ia64: simplify esi object addition in Makefile
  Revert "kbuild: Check if linker supports the -X option"
  kbuild: rebuild .vmlinux.export.o when its prerequisite is updated
  kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o
  zstd: Fixing mixed module-builtin objects
  kallsyms: ignore __kstrtab_* and __kstrtabns_* symbols
  kallsyms: take the input file instead of reading stdin
  kallsyms: drop duplicated ignore patterns from kallsyms.c
  kbuild: reuse mksysmap output for kallsyms
  mksysmap: update comment about __crc_*
  kbuild: remove head-y syntax
  kbuild: use obj-y instead extra-y for objects placed at the head
  kbuild: hide error checker logs for V=1 builds
  kbuild: re-run modpost when it is updated
  kbuild: unify two modpost invocations
  kbuild: move vmlinux.o rule to the top Makefile
  kbuild: move .vmlinux.objs rule to Makefile.modpost
  kbuild: list sub-directories in ./Kbuild
  Makefile.compiler: replace cc-ifversion with compiler-specific macros
  ...
2022-10-10 12:00:45 -07:00

7.1 KiB
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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

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

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

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

all: $(notdir $(KBUILD_IMAGE))

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

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

install: KBUILD_IMAGE := $(boot)/Image install zinstall: $(call cmd,install)

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