add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/Makefile
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@@ -40,7 +40,7 @@
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 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
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 	KBUILD_CFLAGS += -mno-relax
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 	KBUILD_AFLAGS += -mno-relax
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-ifneq ($(LLVM_IAS),1)
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+ifndef CONFIG_AS_IS_LLVM
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 	KBUILD_CFLAGS += -Wa,-mno-relax
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 	KBUILD_AFLAGS += -Wa,-mno-relax
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 endif
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@@ -53,10 +53,12 @@
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 riscv-march-$(CONFIG_FPU)		:= $(riscv-march-y)fd
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 riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)c
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-# Newer binutils versions default to ISA spec version 20191213 which moves some
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-# instructions from the I extension to the Zicsr and Zifencei extensions.
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-toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
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-riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
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+ifdef CONFIG_TOOLCHAIN_NEEDS_OLD_ISA_SPEC
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+KBUILD_CFLAGS += -Wa,-misa-spec=2.2
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+KBUILD_AFLAGS += -Wa,-misa-spec=2.2
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+else
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+riscv-march-$(CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI) := $(riscv-march-y)_zicsr_zifencei
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+endif
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 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
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 KBUILD_AFLAGS += -march=$(riscv-march-y)
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@@ -74,6 +76,9 @@
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         KBUILD_CFLAGS += -fno-omit-frame-pointer
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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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+
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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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