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BPF_DEPENDS := @HAS_BPF_TOOLCHAIN
ifneq ($(CONFIG_BPF_TOOLCHAIN_HOST),)
BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)
BPF_PATH:=$(BPF_TOOLCHAIN_HOST_PATH)/bin:$(PATH)
else
BPF_PATH:=$(PATH)
endif
CLANG:=$(firstword $(shell PATH='$(BPF_PATH)' which clang clang-13 clang-12 clang-11))
LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
else
CLANG:=$(STAGING_DIR_HOST)/bin/clang
LLVM_VER:=
endif
LLVM_PATH:=$(dir $(CLANG))
LLVM_LLC:=$(LLVM_PATH)/llc$(LLVM_VER)
LLVM_DIS:=$(LLVM_PATH)/llvm-dis$(LLVM_VER)
LLVM_OPT:=$(LLVM_PATH)/opt$(LLVM_VER)
LLVM_STRIP:=$(LLVM_PATH)/llvm-strip$(LLVM_VER)
BPF_KARCH:=mips
BPF_ARCH:=mips$(if $(CONFIG_BIG_ENDIAN),,el)
BPF_TARGET:=bpf$(if $(CONFIG_BIG_ENDIAN),eb,el)
BPF_HEADERS_DIR:=$(STAGING_DIR)/bpf-headers
BPF_KERNEL_INCLUDE := \
-nostdinc -isystem $(TOOLCHAIN_DIR)/include \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/asm/mach-generic \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated \
-I$(BPF_HEADERS_DIR)/include \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/uapi \
-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated/uapi \
-I$(BPF_HEADERS_DIR)/include/uapi \
-I$(BPF_HEADERS_DIR)/include/generated/uapi \
-I$(BPF_HEADERS_DIR)/tools/lib \
-I$(BPF_HEADERS_DIR)/tools/testing/selftests \
-I$(BPF_HEADERS_DIR)/samples/bpf \
-include linux/kconfig.h -include asm_goto_workaround.h
BPF_CFLAGS := \
$(BPF_KERNEL_INCLUDE) -I$(PKG_BUILD_DIR) \
-D__KERNEL__ -D__BPF_TRACING__ \
-D__TARGET_ARCH_${BPF_KARCH} \
-m$(if $(CONFIG_BIG_ENDIAN),big,little)-endian \
-fno-stack-protector -Wall \
-Wno-unused-value -Wno-pointer-sign \
-Wno-compare-distinct-pointer-types \
-Wno-gnu-variable-sized-type-not-at-end \
-Wno-address-of-packed-member -Wno-tautological-compare \
-Wno-unknown-warning-option \
-fno-asynchronous-unwind-tables \
-Wno-uninitialized -Wno-unused-variable \
-Wno-unused-label \
-O2 -emit-llvm -Xclang -disable-llvm-passes
define CompileBPF
$(CLANG) -g -target $(BPF_ARCH)-linux-gnu $(BPF_CFLAGS) $(2) \
-c $(1) -o $(patsubst %.c,%.bc,$(1))
$(LLVM_OPT) -O2 -mtriple=$(BPF_TARGET) < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1))
$(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1))
$(LLVM_LLC) -march=$(BPF_TARGET) -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
$(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1))
endef
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