94 lines
2.6 KiB
Makefile
94 lines
2.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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OUTPUT := .output
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abs_out := $(abspath $(OUTPUT))
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CLANG ?= clang
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LLC ?= llc
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LLVM_STRIP ?= llvm-strip
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TOOLS_PATH := $(abspath ../../../../tools)
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BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool
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BPFTOOL_OUTPUT := $(abs_out)/bpftool
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DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
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BPFTOOL ?= $(DEFAULT_BPFTOOL)
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LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf
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LIBBPF_OUTPUT := $(abs_out)/libbpf
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LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
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LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include
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BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a
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INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi
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CFLAGS := -g -Wall
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VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
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$(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
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../../../../vmlinux \
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/sys/kernel/btf/vmlinux \
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/boot/vmlinux-$(shell uname -r)
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VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
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ifeq ($(VMLINUX_BTF),)
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$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
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endif
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ifeq ($(V),1)
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Q =
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msg =
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else
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Q = @
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msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
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MAKEFLAGS += --no-print-directory
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submake_extras := feature_display=0
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endif
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.DELETE_ON_ERROR:
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.PHONY: all clean
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all: entrypoints.lskel.h
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clean:
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$(call msg,CLEAN)
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$(Q)rm -rf $(OUTPUT) entrypoints
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entrypoints.lskel.h: $(OUTPUT)/entrypoints.bpf.o | $(BPFTOOL)
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$(call msg,GEN-SKEL,$@)
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$(Q)$(BPFTOOL) gen skeleton -L $< > $@
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$(OUTPUT)/entrypoints.bpf.o: entrypoints.bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT)
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$(call msg,BPF,$@)
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$(Q)$(CLANG) -g -O2 --target=bpf $(INCLUDES) \
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-c $(filter %.c,$^) -o $@ && \
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$(LLVM_STRIP) -g $@
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$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
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ifeq ($(VMLINUX_H),)
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$(call msg,GEN,,$@)
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$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
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else
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$(call msg,CP,,$@)
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$(Q)cp "$(VMLINUX_H)" $@
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endif
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$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
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$(call msg,MKDIR,$@)
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$(Q)mkdir -p $@
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$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
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$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \
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OUTPUT=$(abspath $(dir $@))/ prefix= \
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DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers
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ifeq ($(CROSS_COMPILE),)
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$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
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$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \
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OUTPUT=$(BPFTOOL_OUTPUT)/ \
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LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/ \
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LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap
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else
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$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
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$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \
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OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
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endif
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