linux-yocto/arch/riscv/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

5.1 KiB

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.

OBJCOPYFLAGS := -O binary LDFLAGS_vmlinux := ifeq ($(CONFIG_DYNAMIC_FTRACE),y) LDFLAGS_vmlinux := --no-relax KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY CC_FLAGS_FTRACE := -fpatchable-function-entry=8 endif

ifeq ($(CONFIG_CMODEL_MEDLOW),y) KBUILD_CFLAGS_MODULE += -mcmodel=medany endif

export BITS ifeq ($(CONFIG_ARCH_RV64I),y) BITS := 64 UTS_MACHINE := riscv64

KBUILD_CFLAGS += -mabi=lp64
KBUILD_AFLAGS += -mabi=lp64

KBUILD_LDFLAGS += -melf64lriscv

else BITS := 32 UTS_MACHINE := riscv32

KBUILD_CFLAGS += -mabi=ilp32
KBUILD_AFLAGS += -mabi=ilp32
KBUILD_LDFLAGS += -melf32lriscv

endif

ifeq ($(CONFIG_LD_IS_LLD),y) KBUILD_CFLAGS += -mno-relax KBUILD_AFLAGS += -mno-relax ifndef CONFIG_AS_IS_LLVM KBUILD_CFLAGS += -Wa,-mno-relax KBUILD_AFLAGS += -Wa,-mno-relax endif endif

ISA string setting

riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c

Newer binutils versions default to ISA spec version 20191213 which moves some

instructions from the I extension to the Zicsr and Zifencei extensions.

toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei) riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei

Check if the toolchain supports Zicbom extension

toolchain-supports-zicbom := $(call cc-option-yn, -march=$(riscv-march-y)_zicbom) riscv-march-$(toolchain-supports-zicbom) := $(riscv-march-y)_zicbom

Check if the toolchain supports Zihintpause extension

toolchain-supports-zihintpause := $(call cc-option-yn, -march=$(riscv-march-y)_zihintpause) riscv-march-$(toolchain-supports-zihintpause) := $(riscv-march-y)_zihintpause

KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y)) KBUILD_AFLAGS += -march=$(riscv-march-y)

KBUILD_CFLAGS += -mno-save-restore KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)

ifeq ($(CONFIG_CMODEL_MEDLOW),y) KBUILD_CFLAGS += -mcmodel=medlow endif ifeq ($(CONFIG_CMODEL_MEDANY),y) KBUILD_CFLAGS += -mcmodel=medany endif ifeq ($(CONFIG_PERF_EVENTS),y) KBUILD_CFLAGS += -fno-omit-frame-pointer endif

KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax) KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)

GCC versions that support the "-mstrict-align" option default to allowing

unaligned accesses. While unaligned accesses are explicitly allowed in the

RISC-V ISA, they're emulated by machine mode traps on all extant

architectures. It's faster to have GCC emit only aligned accesses.

KBUILD_CFLAGS += $(call cc-option,-mstrict-align)

ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) prepare: stack_protector_prepare stack_protector_prepare: prepare0 $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls
-mstack-protector-guard-reg=tp
-mstack-protector-guard-offset=$(shell
awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}'
include/generated/asm-offsets.h)) endif

arch specific predefines for sparse

CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)

Default target when executing plain make

boot := arch/riscv/boot ifeq ($(CONFIG_XIP_KERNEL),y) KBUILD_IMAGE := $(boot)/xipImage else KBUILD_IMAGE := $(boot)/Image.gz endif

libs-y += arch/riscv/lib/ libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a

PHONY += vdso_install vdso_install: $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@ $(if $(CONFIG_COMPAT),$(Q)$(MAKE)
$(build)=arch/riscv/kernel/compat_vdso compat_$@)

ifeq ($(KBUILD_EXTMOD),) ifeq ($(CONFIG_MMU),y) prepare: vdso_prepare vdso_prepare: prepare0 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h $(if $(CONFIG_COMPAT),$(Q)$(MAKE)
$(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)

endif endif

ifneq ($(CONFIG_XIP_KERNEL),y) ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy) KBUILD_IMAGE := $(boot)/loader.bin else ifeq ($(CONFIG_EFI_ZBOOT),) KBUILD_IMAGE := $(boot)/Image.gz else KBUILD_IMAGE := $(boot)/vmlinuz.efi endif endif endif BOOT_TARGETS := Image Image.gz loader loader.bin xipImage vmlinuz.efi

all: $(notdir $(KBUILD_IMAGE))

$(BOOT_TARGETS): vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ @$(kecho) ' Kernel: $(boot)/$@ is ready'

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

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

PHONY += rv32_randconfig rv32_randconfig: $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config
-f $(srctree)/Makefile randconfig

PHONY += rv64_randconfig rv64_randconfig: $(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config
-f $(srctree)/Makefile randconfig

PHONY += rv32_defconfig rv32_defconfig: $(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config