Makefile

TARGET = hs_trace
ARCH = $(shell uname -m | sed 's/x86_64/x86/' | sed 's/aarch64/arm64/')

BPF_OBJ = ${TARGET:=.bpf.o}

USER_C = ${TARGET:=.c}
USER_SKEL = ${TARGET:=.skel.h}

COMMON_H = ${TARGET:=.h}

app: $(TARGET) $(BPF_OBJ)
.PHONY: app

install: $(TARGET) $(BPF_OBJ)
	sudo install -o root -m 4755 hs_trace /usr/local/bin

$(TARGET): $(USER_C) $(USER_SKEL) $(COMMON_H)
	gcc -Wall -o $(TARGET) $(USER_C) -L../libbpf/src -l:libbpf.a -lelf -lz

%.bpf.o: %.bpf.c vmlinux.h $(COMMON_H)
	clang \
	    -target bpf \
		-D __BPF_TRACING__ \
		-D __TARGET_ARCH_$(ARCH) \
		-Wall \
		-I/usr/include/$(shell uname -m)-linux-gnu \
		-O2 -g -o $@ -c $<
	llvm-strip -g $@

$(USER_SKEL): $(BPF_OBJ)
	bpftool gen skeleton $< > $@

vmlinux.h:
	bpftool btf dump file /sys/kernel/btf/vmlinux format c > vmlinux.h

clean:
	- rm $(BPF_OBJ)
	- rm $(TARGET)
	- rm $(USER_SKEL)