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1# SPDX-License-Identifier: GPL-2.02OUTPUT := .output3abs_out := $(abspath $(OUTPUT))4 5CLANG ?= clang6LLC ?= llc7LLVM_STRIP ?= llvm-strip8 9TOOLS_PATH := $(abspath ../../../../tools)10BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool11BPFTOOL_OUTPUT := $(abs_out)/bpftool12DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool13BPFTOOL ?= $(DEFAULT_BPFTOOL)14 15LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf16LIBBPF_OUTPUT := $(abs_out)/libbpf17LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)18LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include19BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a20 21INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi22CFLAGS := -g -Wall23 24VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \25 $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \26 ../../../../vmlinux \27 /sys/kernel/btf/vmlinux \28 /boot/vmlinux-$(shell uname -r)29VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))30ifeq ($(VMLINUX_BTF),)31$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")32endif33 34ifeq ($(V),1)35Q =36msg =37else38Q = @39msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";40MAKEFLAGS += --no-print-directory41submake_extras := feature_display=042endif43 44.DELETE_ON_ERROR:45 46.PHONY: all clean47 48SOURCES = $(wildcard *.bpf.c)49TARGETS = $(SOURCES:.bpf.c=.bpf.o)50 51all: $(TARGETS)52 53clean:54 $(call msg,CLEAN)55 $(Q)rm -rf $(OUTPUT) $(TARGETS)56 57%.bpf.o: %.bpf.c vmlinux.h $(BPFOBJ) | $(OUTPUT)58 $(call msg,BPF,$@)59 $(Q)$(CLANG) -g -O2 --target=bpf -Wall -Werror $(INCLUDES) \60 -c $(filter %.c,$^) -o $@ && \61 $(LLVM_STRIP) -g $@62 63vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)64ifeq ($(VMLINUX_H),)65 $(call msg,GEN,,$@)66 $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@67else68 $(call msg,CP,,$@)69 $(Q)cp "$(VMLINUX_H)" $@70endif71 72$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):73 $(call msg,MKDIR,$@)74 $(Q)mkdir -p $@75 76$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)77 $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \78 OUTPUT=$(abspath $(dir $@))/ prefix= \79 DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers80 81ifeq ($(CROSS_COMPILE),)82$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)83 $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \84 OUTPUT=$(BPFTOOL_OUTPUT)/ \85 LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/ \86 LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap87else88$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)89 $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \90 OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap91endif92