mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-09-18 22:59:29 +02:00
Vivian Wang
7655525298
Instead of adding these to -march globally, use .option arch to use
instructions from these extensions only in code paths where we know they
are available, like how it is done for most other extensions.
TOOLCHAIN_HAS_{ZACAS,ZABHA} already depend on AS_HAS_OPTION_ARCH, so
this is not a functionality regression even on older assemblers.
Although the compiler is unlikely to generate atomics on its own accord,
this aligns handling of Zacas and Zabha with most other extensions and
improves consistency on how assembly code requiring extra extensions is
written in kernel code.
This is analogous to the use of __LSE_PREAMBLE or .arch_extension lse in
arm64 code.
Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>
Reviewed-by: Jesse Taube <jtaubepe@redhat.com>
Link: https://patch.msgid.link/20260717-riscv-no-zacas-zabha-in-march-v1-1-82b5b0799fb6@iscas.ac.cn
Signed-off-by: Paul Walmsley <pjw@kernel.org>
218 lines
7.5 KiB
Makefile
218 lines
7.5 KiB
Makefile
# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies.
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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LDFLAGS_vmlinux := -z norelro
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ifeq ($(CONFIG_RELOCATABLE),y)
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LDFLAGS_vmlinux += -shared -Bsymbolic -z notext
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KBUILD_CFLAGS += -fPIE
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endif
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ifeq ($(CONFIG_DYNAMIC_FTRACE),y)
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LDFLAGS_vmlinux += --no-relax
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KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
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ifeq ($(CONFIG_RISCV_ISA_C),y)
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CC_FLAGS_FTRACE := -fpatchable-function-entry=8,4
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else
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CC_FLAGS_FTRACE := -fpatchable-function-entry=4,2
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endif
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endif
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ifeq ($(CONFIG_CMODEL_MEDLOW),y)
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KBUILD_CFLAGS_MODULE += -mcmodel=medany
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endif
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export BITS
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ifeq ($(CONFIG_ARCH_RV64I),y)
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BITS := 64
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KBUILD_CFLAGS += -mabi=lp64
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KBUILD_AFLAGS += -mabi=lp64
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KBUILD_LDFLAGS += -melf64lriscv
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KBUILD_RUSTFLAGS += -Ctarget-cpu=generic-rv64 --target=riscv64imac-unknown-none-elf \
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-Cno-redzone
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else
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BITS := 32
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KBUILD_CFLAGS += -mabi=ilp32
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KBUILD_AFLAGS += -mabi=ilp32
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KBUILD_LDFLAGS += -melf32lriscv
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endif
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UTS_MACHINE := riscv$(BITS)
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# LLVM has an issue with target-features and LTO: https://github.com/llvm/llvm-project/issues/59350
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# Ensure it is aware of linker relaxation with LTO, otherwise relocations may
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# be incorrect: https://github.com/llvm/llvm-project/issues/65090
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ifeq ($(CONFIG_LTO_CLANG),y)
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KBUILD_LDFLAGS += -mllvm -mattr=+c -mllvm -mattr=+relax
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endif
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ifeq ($(CONFIG_SHADOW_CALL_STACK),y)
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KBUILD_LDFLAGS += --no-relax-gp
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endif
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# ISA string setting
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riscv-march-$(CONFIG_ARCH_RV32I) := rv32ima
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riscv-march-$(CONFIG_ARCH_RV64I) := rv64ima
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riscv-march-$(CONFIG_FPU) := $(riscv-march-y)fd
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riscv-march-$(CONFIG_RISCV_ISA_C) := $(riscv-march-y)c
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riscv-march-$(CONFIG_RISCV_ISA_V) := $(riscv-march-y)v
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ifneq ($(CONFIG_RISCV_ISA_C),y)
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KBUILD_RUSTFLAGS += -Ctarget-feature=-c
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endif
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ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
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KBUILD_CFLAGS += -Wa,-misa-spec=2.2
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KBUILD_AFLAGS += -Wa,-misa-spec=2.2
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else
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riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
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endif
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KBUILD_BASE_ISA = -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)fd([^v_]*)v?/\1\2/')
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export KBUILD_BASE_ISA
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# Remove F,D,V from isa string for all. Keep extensions between "fd" and "v" by
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# matching non-v and non-multi-letter extensions out with the filter ([^v_]*)
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KBUILD_CFLAGS += $(KBUILD_BASE_ISA)
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KBUILD_AFLAGS += -march=$(riscv-march-y)
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# For C code built with floating-point support, exclude V but keep F and D.
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CC_FLAGS_FPU := -march=$(shell echo $(riscv-march-y) | sed -E 's/(rv32ima|rv64ima)([^v_]*)v?/\1\2/')
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KBUILD_CFLAGS += -mno-save-restore
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ifeq ($(CONFIG_CMODEL_MEDLOW),y)
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KBUILD_CFLAGS += -mcmodel=medlow
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endif
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ifeq ($(CONFIG_CMODEL_MEDANY),y)
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KBUILD_CFLAGS += -mcmodel=medany
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endif
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# Avoid generating .eh_frame sections.
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KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
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# The RISC-V attributes frequently cause compatibility issues and provide no
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# information, so just turn them off.
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KBUILD_CFLAGS += $(call cc-option,-mno-riscv-attribute)
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KBUILD_AFLAGS += $(call cc-option,-mno-riscv-attribute)
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KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
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KBUILD_AFLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)
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KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-relax)
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KBUILD_AFLAGS_MODULE += $(call as-option,-Wa$(comma)-mno-relax)
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# GCC versions that support the "-mstrict-align" option default to allowing
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# unaligned accesses. While unaligned accesses are explicitly allowed in the
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# RISC-V ISA, they're emulated by machine mode traps on all extant
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# architectures. It's faster to have GCC emit only aligned accesses.
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ifneq ($(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS),y)
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KBUILD_CFLAGS += $(call cc-option,-mstrict-align)
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endif
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ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
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prepare: stack_protector_prepare
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stack_protector_prepare: prepare0
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$(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \
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-mstack-protector-guard-reg=tp \
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-mstack-protector-guard-offset=$(shell \
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awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \
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$(objtree)/include/generated/asm-offsets.h))
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endif
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# arch specific predefines for sparse
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CHECKFLAGS += -D__riscv -D__riscv_xlen=$(BITS)
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# Default target when executing plain make
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boot := arch/riscv/boot
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boot-image-y := Image
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boot-image-$(CONFIG_KERNEL_BZIP2) := Image.bz2
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boot-image-$(CONFIG_KERNEL_GZIP) := Image.gz
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boot-image-$(CONFIG_KERNEL_LZ4) := Image.lz4
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boot-image-$(CONFIG_KERNEL_LZMA) := Image.lzma
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boot-image-$(CONFIG_KERNEL_LZO) := Image.lzo
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boot-image-$(CONFIG_KERNEL_ZSTD) := Image.zst
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boot-image-$(CONFIG_KERNEL_XZ) := Image.xz
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ifdef CONFIG_RISCV_M_MODE
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boot-image-$(CONFIG_SOC_CANAAN_K210) := loader.bin
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endif
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boot-image-$(CONFIG_EFI_ZBOOT) := vmlinuz.efi
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KBUILD_IMAGE := $(boot)/$(boot-image-y)
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libs-y += arch/riscv/lib/
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libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
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ifeq ($(KBUILD_EXTMOD),)
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ifeq ($(CONFIG_MMU),y)
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prepare: vdso_prepare
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vdso_prepare: prepare0
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$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
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$(if $(CONFIG_RISCV_USER_CFI),$(Q)$(MAKE) \
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$(build)=arch/riscv/kernel/vdso_cfi include/generated/vdso-cfi-offsets.h)
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$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
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$(build)=arch/riscv/kernel/compat_vdso include/generated/compat_vdso-offsets.h)
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endif
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endif
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vdso-install-$(CONFIG_MMU) += arch/riscv/kernel/vdso/vdso.so.dbg
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vdso-install-$(CONFIG_RISCV_USER_CFI) += arch/riscv/kernel/vdso_cfi/vdso-cfi.so.dbg
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vdso-install-$(CONFIG_COMPAT) += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg
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BOOT_TARGETS := Image Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader loader.bin vmlinuz.efi
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all: $(notdir $(KBUILD_IMAGE))
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loader.bin: loader
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Image.gz Image.bz2 Image.lz4 Image.lzma Image.lzo Image.zst Image.xz loader vmlinuz.efi: Image
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$(BOOT_TARGETS): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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@$(kecho) ' Kernel: $(boot)/$@ is ready'
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# the install target always installs KBUILD_IMAGE (which may be compressed)
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# but keep the zinstall target for compatibility with older releases
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install zinstall:
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$(call cmd,install)
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PHONY += rv32_randconfig
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rv32_randconfig:
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$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/32-bit.config \
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-f $(srctree)/Makefile randconfig
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PHONY += rv64_randconfig
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rv64_randconfig:
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$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/riscv/configs/64-bit.config \
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-f $(srctree)/Makefile randconfig
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PHONY += rv32_defconfig
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rv32_defconfig:
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$(Q)$(MAKE) -f $(srctree)/Makefile defconfig 32-bit.config
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PHONY += rv32_nommu_virt_defconfig
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rv32_nommu_virt_defconfig:
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$(Q)$(MAKE) -f $(srctree)/Makefile nommu_virt_defconfig 32-bit.config
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define archhelp
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echo ' Image - Uncompressed kernel image (arch/riscv/boot/Image)'
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echo ' Image.gz - Compressed kernel image (arch/riscv/boot/Image.gz)'
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echo ' Image.bz2 - Compressed kernel image (arch/riscv/boot/Image.bz2)'
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echo ' Image.lz4 - Compressed kernel image (arch/riscv/boot/Image.lz4)'
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echo ' Image.lzma - Compressed kernel image (arch/riscv/boot/Image.lzma)'
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echo ' Image.lzo - Compressed kernel image (arch/riscv/boot/Image.lzo)'
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echo ' Image.zst - Compressed kernel image (arch/riscv/boot/Image.zst)'
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echo ' Image.xz - Compressed kernel image (arch/riscv/boot/Image.xz)'
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echo ' vmlinuz.efi - Compressed EFI kernel image (arch/riscv/boot/vmlinuz.efi)'
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echo ' Default when CONFIG_EFI_ZBOOT=y'
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echo ' install - Install kernel using (your) ~/bin/$(INSTALLKERNEL) or'
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echo ' (distribution) /sbin/$(INSTALLKERNEL) or install to '
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echo ' $$(INSTALL_PATH)'
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endef
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