104 lines
3.1 KiB
Makefile
104 lines
3.1 KiB
Makefile
# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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OUTPUT := .output
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CLANG ?= clang
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LLVM_STRIP ?= llvm-strip
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SHELL := /bin/bash
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LIBLOG_OBJ := $(abspath $(OUTPUT)/liblog.o)
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LIBLOG_SRC := $(abspath ./includes/liblog/src/log.c)
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LIBLOG_HDR := $(abspath ./includes/liblog/src/)
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INC := $(abspath ./includes/)
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BPFTOOL := sudo bpftool
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ARCH := $(shell uname -m | sed 's/x86_64/x86/' | sed 's/aarch64/arm64/' | sed 's/ppc64le/powerpc/' | sed 's/mips.*/mips/')
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INCLUDES := -I$(OUTPUT) -I$(LIBLOG_HDR) -I$(INC)
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CFLAGS := -g -Wall -DLOG_USE_COLOR
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ALL_LDFLAGS := $(LDFLAGS) $(EXTRA_LDFLAGS)
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APPS = netcat_ebpf_demo
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SOURCES := $(filter-out src/$(APPS).c,$(wildcard src/*.c))
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ALL_LDFLAGS += -lrt -ldl -lpthread -lm -lbpf -lelf -lz
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# Get Clang's default includes on this system. We'll explicitly add these dirs
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# to the includes list when compiling with `-target bpf` because otherwise some
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# architecture-specific dirs will be "missing" on some architectures/distros -
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# headers such as asm/types.h, asm/byteorder.h, asm/socket.h, asm/sockios.h,
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# sys/cdefs.h etc. might be missing.
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#
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# Use '-idirafter': Don't interfere with include mechanics except where the
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# build would have failed anyways.
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CLANG_BPF_SYS_INCLUDES = $(shell $(CLANG) -v -E - </dev/null 2>&1 \
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| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }')
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ifeq ($(V),1)
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Q =
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msg =
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else
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Q = @
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msg = @printf ' %-8s %s%s\n' \
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"$(1)" \
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"$(patsubst $(abspath $(OUTPUT))/%,%,$(2))" \
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"$(if $(3), $(3))";
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MAKEFLAGS += --no-print-directory
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endif
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define allow-override
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$(if $(or $(findstring environment,$(origin $(1))),\
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$(findstring command line,$(origin $(1)))),,\
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$(eval $(1) = $(2)))
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endef
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$(call allow-override,CC,$(CROSS_COMPILE)cc)
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$(call allow-override,LD,$(CROSS_COMPILE)ld)
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.PHONY: all
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all: $(APPS)
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.PHONY: clean
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clean:
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$(call msg,CLEAN)
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$(Q)rm -rf $(OUTPUT) $(APPS)
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clean-app:
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$(call msg,CLEAN-APP)
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$(Q)rm -rf $(APPS)
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$(Q)rm -rf $(OUTPUT)/*.skel.h
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$(Q)rm -rf $(OUTPUT)/*.o
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$(OUTPUT):
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$(call msg,MKDIR,$@)
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$(Q)mkdir -p $@
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# Build liblog
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$(LIBLOG_OBJ):
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$(call msg,LIBLOG,$@)
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$(Q)$(CC) $(CFLAGS) $(INCLUDES) -c $(LIBLOG_SRC) -o $@
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# Build BPF code
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$(OUTPUT)/%.bpf.o: src/ebpf/%.bpf.c $(wildcard src/ebpf/%.h) $(VMLINUX) | $(OUTPUT)
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$(call msg,BPF,$@)
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$(Q)$(CLANG) -Wno-int-to-void-pointer-cast -g -O2 -target bpf -D__TARGET_ARCH_$(ARCH) $(INCLUDES) $(CLANG_BPF_SYS_INCLUDES) -c $(filter %.c,$^) -o $@
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$(Q)$(LLVM_STRIP) -g $@ # strip useless DWARF info
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# Generate BPF skeletons
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$(OUTPUT)/%.skel.h: $(OUTPUT)/%.bpf.o | $(OUTPUT)
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$(call msg,GEN-SKEL,$@)
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$(Q)$(BPFTOOL) gen skeleton $< > $@
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# Build user-space code
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$(patsubst %,$(OUTPUT)/%.o,$(APPS)): %.o: %.skel.h
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$(OUTPUT)/%.o: src/%.c $(wildcard %.h) | $(OUTPUT)
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$(call msg,CC,$@)
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$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(INCLUDES) -o $@
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# Build application binary
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$(APPS): %: $(OUTPUT)/%.o $(LIBLOG_OBJ) | $(OUTPUT)
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$(call msg,BINARY,$@)
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$(Q)$(CC) $(CFLAGS) $(SOURCES) $^ $(ALL_LDFLAGS) -o $@
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# delete failed targets
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.DELETE_ON_ERROR:
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# keep intermediate (.skel.h, .bpf.o, etc) targets
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.SECONDARY:
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