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Makefile
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Makefile
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# SPDX-License-Identifier: GPL-2.0-only OR MIT
#
# Copyright (C) 2023 The Falco Authors.
#
# This file is dual licensed under either the MIT or GPL 2. See
# MIT.txt or GPL.txt for full copies of the license.
#
always-y += probe.o
# kept for compatibility with kernels < 5.11
always = $(always-y)
LLC ?= llc
CLANG ?= clang
# DEBUG = -DBPF_DEBUG
ifeq ($(strip $(MAKEFILE_LIST)),Makefile)
KERNELDIR ?= /lib/modules/$(shell uname -r)/build
all:
$(MAKE) -C $(KERNELDIR) M=$$PWD
clean:
$(MAKE) -C $(KERNELDIR) M=$$PWD clean
@rm -f *~
else
KERNELDIR ?= $(CURDIR)
#
# Get the path of the module sources
#
FIRST_MAKEFILE := $(firstword $(MAKEFILE_LIST))
FIRST_MAKEFILE_FILENAME := $(notdir $(FIRST_MAKEFILE))
FIRST_MAKEFILE_DIRNAME := $(shell basename $(dir $(FIRST_MAKEFILE)))
ifeq ($(FIRST_MAKEFILE_DIRNAME)/$(FIRST_MAKEFILE_FILENAME), scripts/Makefile.build)
# Build phase
MODULE_MAKEFILE_DIR := $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
MAKEFILE_INC_FILES := $(shell find $(MODULE_MAKEFILE_DIR)/configure -type f -name Makefile.inc)
$(info [configure-bpf] Including $(MAKEFILE_INC_FILES))
include $(MAKEFILE_INC_FILES)
endif
#
# https://chromium.googlesource.com/chromiumos/third_party/kernel/+/096925a44076ba5c52faa84d255a847130ff341e%5E%21/#F2
# This commit diverged the ChromiumOS kernel from stock in the area of audit information, which this probe accesses.
#
# This enables the workaround for this divergence.
#
NEEDS_COS_73_WORKAROUND = $(shell expr `grep -sc "^\s*struct\s\+audit_task_info\s\+\*audit;\s*$$" $(KERNELDIR)/include/linux/sched.h` = 1)
ifeq ($(NEEDS_COS_73_WORKAROUND), 1)
KBUILD_CPPFLAGS += -DCOS_73_WORKAROUND
endif
# -fmacro-prefix-map is not supported on version of clang older than 10
# so remove it if necessary.
IS_CLANG_OLDER_THAN_10 := $(shell expr `$(CLANG) -dumpversion | cut -f1 -d.` \<= 10)
ifeq ($(IS_CLANG_OLDER_THAN_10), 1)
KBUILD_CPPFLAGS := $(filter-out -fmacro-prefix-map=%,$(KBUILD_CPPFLAGS))
endif
$(obj)/probe.o: $(src)/probe.c \
$(src)/bpf_helpers.h \
$(src)/filler_helpers.h \
$(src)/fillers.h \
$(src)/maps.h \
$(src)/plumbing_helpers.h \
$(src)/quirks.h \
$(src)/ring_helpers.h \
$(src)/missing_definitions.h \
$(src)/types.h
$(CLANG) $(LINUXINCLUDE) \
$(KBUILD_CPPFLAGS) \
$(KBUILD_EXTRA_CPPFLAGS) \
$(DEBUG) \
-D__KERNEL__ \
-D__BPF_TRACING__ \
-Wno-gnu-variable-sized-type-not-at-end \
-Wno-address-of-packed-member \
-fno-jump-tables \
-fno-stack-protector \
-Wno-tautological-compare \
-Wno-unknown-attributes \
-O2 -g -emit-llvm -c $< -o $(patsubst %.o,%.ll,$@)
$(LLC) -march=bpf -filetype=obj -o $@ $(patsubst %.o,%.ll,$@)
endif # $(strip $(MAKEFILE_LIST)),Makefile