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694aed607f
Avoid spurious runtime errors caused by loading eBPF modules built with an old clang version Signed-off-by: Felix Fietkau <nbd@nbd.name>
83 lines
2.9 KiB
Makefile
83 lines
2.9 KiB
Makefile
BPF_DEPENDS := @HAS_BPF_TOOLCHAIN
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LLVM_VER:=
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CLANG_MIN_VER:=12
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ifneq ($(CONFIG_USE_LLVM_HOST),)
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BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
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ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)
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BPF_PATH:=$(BPF_TOOLCHAIN_HOST_PATH)/bin:$(PATH)
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else
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BPF_PATH:=$(PATH)
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endif
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CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11))
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LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
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endif
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ifneq ($(CONFIG_USE_LLVM_PREBUILT),)
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CLANG:=$(TOPDIR)/llvm-bpf/bin/clang
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endif
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ifneq ($(CONFIG_USE_LLVM_BUILD),)
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CLANG:=$(STAGING_DIR_HOST)/llvm-bpf/bin/clang
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endif
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LLVM_PATH:=$(dir $(CLANG))
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LLVM_LLC:=$(LLVM_PATH)/llc$(LLVM_VER)
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LLVM_DIS:=$(LLVM_PATH)/llvm-dis$(LLVM_VER)
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LLVM_OPT:=$(LLVM_PATH)/opt$(LLVM_VER)
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LLVM_STRIP:=$(LLVM_PATH)/llvm-strip$(LLVM_VER)
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BPF_KARCH:=mips
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BPF_ARCH:=mips$(if $(CONFIG_BIG_ENDIAN),,el)
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BPF_TARGET:=bpf$(if $(CONFIG_BIG_ENDIAN),eb,el)
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BPF_HEADERS_DIR:=$(STAGING_DIR)/bpf-headers
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BPF_KERNEL_INCLUDE := \
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-nostdinc -isystem $(TOOLCHAIN_DIR)/include \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/asm/mach-generic \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated \
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-I$(BPF_HEADERS_DIR)/include \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/uapi \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated/uapi \
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-I$(BPF_HEADERS_DIR)/include/uapi \
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-I$(BPF_HEADERS_DIR)/include/generated/uapi \
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-I$(BPF_HEADERS_DIR)/tools/lib \
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-I$(BPF_HEADERS_DIR)/tools/testing/selftests \
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-I$(BPF_HEADERS_DIR)/samples/bpf \
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-include linux/kconfig.h -include asm_goto_workaround.h
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BPF_CFLAGS := \
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$(BPF_KERNEL_INCLUDE) -I$(PKG_BUILD_DIR) \
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-D__KERNEL__ -D__BPF_TRACING__ \
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-D__TARGET_ARCH_${BPF_KARCH} \
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-m$(if $(CONFIG_BIG_ENDIAN),big,little)-endian \
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-fno-stack-protector -Wall \
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-Wno-unused-value -Wno-pointer-sign \
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-Wno-compare-distinct-pointer-types \
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-Wno-gnu-variable-sized-type-not-at-end \
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-Wno-address-of-packed-member -Wno-tautological-compare \
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-Wno-unknown-warning-option \
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-fno-asynchronous-unwind-tables \
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-Wno-uninitialized -Wno-unused-variable \
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-Wno-unused-label \
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-O2 -emit-llvm -Xclang -disable-llvm-passes
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ifeq ($(DUMP),)
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CLANG_VER:=$(shell clang -dM -E - < /dev/null | grep __clang_major__ | cut -d' ' -f3)
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CLANG_VER_VALID:=$(shell [ "$(CLANG_VER)" -ge "$(CLANG_MIN_VER)" ] && echo 1 )
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ifeq ($(CLANG_VER_VALID),)
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$(error ERROR: LLVM/clang version too old. Minimum required: $(CLANG_MIN_VER), found: $(CLANG_VER))
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endif
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endif
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define CompileBPF
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$(CLANG) -g -target $(BPF_ARCH)-linux-gnu $(BPF_CFLAGS) $(2) \
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-c $(1) -o $(patsubst %.c,%.bc,$(1))
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$(LLVM_OPT) -O2 -mtriple=$(BPF_TARGET) < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1))
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$(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1))
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$(LLVM_LLC) -march=$(BPF_TARGET) -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
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$(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1))
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endef
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