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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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HID_SAMPLES_PATH ?= $(abspath $(src))TOOLS_PATH := $(HID_SAMPLES_PATH)/../../tools
pound := \#
# List of programs to buildtprogs-y += hid_mousetprogs-y += hid_surface_dial
# Libbpf dependenciesLIBBPF_SRC = $(TOOLS_PATH)/lib/bpfLIBBPF_OUTPUT = $(abspath $(HID_SAMPLES_PATH))/libbpfLIBBPF_DESTDIR = $(LIBBPF_OUTPUT)LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/includeLIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
EXTRA_BPF_HEADERS := hid_bpf_helpers.h
hid_mouse-objs := hid_mouse.ohid_surface_dial-objs := hid_surface_dial.o
# Tell kbuild to always build the programsalways-y := $(tprogs-y)
ifeq ($(ARCH), arm)# Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux# headers when arm instruction set identification is requested.ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS))BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR)TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR)endif
ifeq ($(ARCH), mips)TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__ifdef CONFIG_MACH_LOONGSON64BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-loongson64BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-genericendifendif
COMMON_CFLAGS += -Wall -O2COMMON_CFLAGS += -Wmissing-prototypesCOMMON_CFLAGS += -Wstrict-prototypes
TPROGS_CFLAGS += $(COMMON_CFLAGS)TPROGS_CFLAGS += -I$(objtree)/usr/includeTPROGS_CFLAGS += -I$(LIBBPF_INCLUDE)TPROGS_CFLAGS += -I$(srctree)/tools/include
ifdef SYSROOTCOMMON_CFLAGS += --sysroot=$(SYSROOT)TPROGS_LDFLAGS := -L$(SYSROOT)/usr/libendif
TPROGS_LDLIBS += $(LIBBPF) -lelf -lz
# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:# make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clangLLC ?= llcCLANG ?= clangOPT ?= optLLVM_DIS ?= llvm-disLLVM_OBJCOPY ?= llvm-objcopyLLVM_READELF ?= llvm-readelfBTF_PAHOLE ?= pahole
# Detect that we're cross compiling and use the cross compilerifdef CROSS_COMPILECLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%))endif
# Don't evaluate probes and warnings if we need to run make recursivelyifneq ($(src),)HDR_PROBE := $(shell printf "$(pound)include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \ $(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c - \ -o /dev/null 2>/dev/null && echo okay)
ifeq ($(HDR_PROBE),)$(warning WARNING: Detected possible issues with include path.)$(warning WARNING: Please install kernel headers locally (make headers_install).)endif
BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \ $(CLANG) --target=bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \ $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \ /bin/rm -f ./llvm_btf_verify.o)
BPF_EXTRA_CFLAGS += -fno-stack-protectorifneq ($(BTF_LLVM_PROBE),) BPF_EXTRA_CFLAGS += -gelseifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),) BPF_EXTRA_CFLAGS += -g LLC_FLAGS += -mattr=dwarfris DWARF2BTF = yendifendifendif
# Trick to allow make to be run from this directoryall: $(MAKE) -C ../../ M=$(CURDIR) HID_SAMPLES_PATH=$(CURDIR)
clean: $(MAKE) -C ../../ M=$(CURDIR) clean @find $(CURDIR) -type f -name '*~' -delete @$(RM) -r $(CURDIR)/libbpf $(CURDIR)/bpftool
$(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)# Fix up variables inherited from Kbuild that tools/ build system won't like $(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' EXTRA_CFLAGS="$(COMMON_CFLAGS)" \ LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(HID_SAMPLES_PATH)/../../ \ O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \ $@ install_headers
BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftoolBPFTOOL_OUTPUT := $(abspath $(HID_SAMPLES_PATH))/bpftoolBPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool$(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) | $(BPFTOOL_OUTPUT) $(MAKE) -C $(BPFTOOLDIR) srctree=$(HID_SAMPLES_PATH)/../../ \ OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
$(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT): $(call msg,MKDIR,$@) $(Q)mkdir -p $@
FORCE:
# Verify LLVM compiler tools are available and bpf target is supported by llc.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
verify_cmds: $(CLANG) $(LLC) @for TOOL in $^ ; do \ if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \ echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\ exit 1; \ else true; fi; \ done
verify_target_bpf: verify_cmds @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \ echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\ echo " NOTICE: LLVM version >= 3.7.1 required" ;\ exit 2; \ else true; fi
$(HID_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)$(src)/*.c: verify_target_bpf $(LIBBPF)
libbpf_hdrs: $(LIBBPF)
.PHONY: libbpf_hdrs
$(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h$(obj)/hid_surface_dial.o: $(obj)/hid_surface_dial.skel.h
-include $(HID_SAMPLES_PATH)/Makefile.target
VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux)) \ $(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \ $(abspath $(objtree)/vmlinux)VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
$(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)ifeq ($(VMLINUX_H),)ifeq ($(VMLINUX_BTF),) $(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\ build the kernel or set VMLINUX_BTF or VMLINUX_H variable)endif $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@else $(Q)cp "$(VMLINUX_H)" $@endif
clean-files += vmlinux.h
# Get Clang's default includes on this system, as opposed to those seen by# '--target=bpf'. This fixes "missing" files on some architectures/distros,# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.## Use '-idirafter': Don't interfere with include mechanics except where the# build would have failed anyways.define get_sys_includes$(shell $(1) -v -E - </dev/null 2>&1 \ | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \$(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' | sed 's/#define /-D/' | sed 's/ /=/')endef
CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
EXTRA_BPF_HEADERS_SRC := $(addprefix $(src)/,$(EXTRA_BPF_HEADERS))
$(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEADERS_SRC) $(obj)/vmlinux.h @echo " CLANG-BPF " $@ $(Q)$(CLANG) -g -O2 --target=bpf -D__TARGET_ARCH_$(SRCARCH) \ -Wno-compare-distinct-pointer-types -I$(srctree)/include \ -I$(srctree)/samples/bpf -I$(srctree)/tools/include \ -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \ -c $(filter %.bpf.c,$^) -o $@
LINKED_SKELS := hid_mouse.skel.h hid_surface_dial.skel.hclean-files += $(LINKED_SKELS)
hid_mouse.skel.h-deps := hid_mouse.bpf.ohid_surface_dial.skel.h-deps := hid_surface_dial.bpf.o
LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c))BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED))BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS))
$(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL) @echo " BPF GEN-OBJ " $(@:.skel.h=) $(Q)$(BPFTOOL) gen object $(@:.skel.h=.lbpf.o) $(addprefix $(obj)/,$($(@F)-deps)) @echo " BPF GEN-SKEL" $(@:.skel.h=) $(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@
# asm/sysreg.h - inline assembly used by it is incompatible with llvm.# But, there is no easy way to fix it, so just exclude it since it is# useless for BPF samples.# below we use long chain of commands, clang | opt | llvm-dis | llc,# to generate final object file. 'clang' compiles the source into IR# with native target, e.g., x64, arm64, etc. 'opt' does bpf CORE IR builtin# processing (llvm12) and IR optimizations. 'llvm-dis' converts# 'opt' output to IR, and finally 'llc' generates bpf byte code.$(obj)/%.o: $(src)/%.c @echo " CLANG-bpf " $@ $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS) \ -I$(obj) -I$(srctree)/tools/testing/selftests/bpf/ \ -I$(LIBBPF_INCLUDE) \ -D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \ -D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \ -Wno-gnu-variable-sized-type-not-at-end \ -Wno-address-of-packed-member -Wno-tautological-compare \ -Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \ -fno-asynchronous-unwind-tables \ -I$(srctree)/samples/hid/ \ -O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \ $(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \ $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@ifeq ($(DWARF2BTF),y) $(BTF_PAHOLE) -J $@endif