Makefile

  1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
  2include ../../scripts/Makefile.include
  3
  4ifeq ($(srctree),)
  5srctree := $(patsubst %/,%,$(dir $(CURDIR)))
  6srctree := $(patsubst %/,%,$(dir $(srctree)))
  7srctree := $(patsubst %/,%,$(dir $(srctree)))
  8endif
  9
 10BPF_DIR = $(srctree)/tools/lib/bpf
 11
 12ifneq ($(OUTPUT),)
 13  _OUTPUT := $(OUTPUT)
 14else
 15  _OUTPUT := $(CURDIR)/
 16endif
 17BOOTSTRAP_OUTPUT := $(_OUTPUT)bootstrap/
 18
 19LIBBPF_OUTPUT := $(_OUTPUT)libbpf/
 20LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
 21LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)include
 22LIBBPF_HDRS_DIR := $(LIBBPF_INCLUDE)/bpf
 23LIBBPF := $(LIBBPF_OUTPUT)libbpf.a
 24
 25LIBBPF_BOOTSTRAP_OUTPUT := $(BOOTSTRAP_OUTPUT)libbpf/
 26LIBBPF_BOOTSTRAP_DESTDIR := $(LIBBPF_BOOTSTRAP_OUTPUT)
 27LIBBPF_BOOTSTRAP_INCLUDE := $(LIBBPF_BOOTSTRAP_DESTDIR)include
 28LIBBPF_BOOTSTRAP_HDRS_DIR := $(LIBBPF_BOOTSTRAP_INCLUDE)/bpf
 29LIBBPF_BOOTSTRAP := $(LIBBPF_BOOTSTRAP_OUTPUT)libbpf.a
 30
 31# We need to copy hashmap.h, nlattr.h, relo_core.h and libbpf_internal.h
 32# which are not otherwise exported by libbpf, but still required by bpftool.
 33LIBBPF_INTERNAL_HDRS := $(addprefix $(LIBBPF_HDRS_DIR)/,hashmap.h nlattr.h relo_core.h libbpf_internal.h)
 34LIBBPF_BOOTSTRAP_INTERNAL_HDRS := $(addprefix $(LIBBPF_BOOTSTRAP_HDRS_DIR)/,hashmap.h relo_core.h libbpf_internal.h)
 35
 36$(LIBBPF_OUTPUT) $(BOOTSTRAP_OUTPUT) $(LIBBPF_BOOTSTRAP_OUTPUT) $(LIBBPF_HDRS_DIR) $(LIBBPF_BOOTSTRAP_HDRS_DIR):
 37	$(QUIET_MKDIR)mkdir -p $@
 38
 39$(LIBBPF): $(wildcard $(BPF_DIR)/*.[ch] $(BPF_DIR)/Makefile) | $(LIBBPF_OUTPUT)
 40	$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_OUTPUT) \
 41		DESTDIR=$(LIBBPF_DESTDIR:/=) prefix= $(LIBBPF) install_headers
 42
 43$(LIBBPF_INTERNAL_HDRS): $(LIBBPF_HDRS_DIR)/%.h: $(BPF_DIR)/%.h | $(LIBBPF_HDRS_DIR)
 44	$(call QUIET_INSTALL, $@)
 45	$(Q)install -m 644 -t $(LIBBPF_HDRS_DIR) $<
 46
 47$(LIBBPF_BOOTSTRAP): $(wildcard $(BPF_DIR)/*.[ch] $(BPF_DIR)/Makefile) | $(LIBBPF_BOOTSTRAP_OUTPUT)
 48	$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_BOOTSTRAP_OUTPUT) \
 49		DESTDIR=$(LIBBPF_BOOTSTRAP_DESTDIR:/=) prefix= \
 50		ARCH= CROSS_COMPILE= CC="$(HOSTCC)" LD="$(HOSTLD)" AR="$(HOSTAR)" $@ install_headers
 51
 52$(LIBBPF_BOOTSTRAP_INTERNAL_HDRS): $(LIBBPF_BOOTSTRAP_HDRS_DIR)/%.h: $(BPF_DIR)/%.h | $(LIBBPF_BOOTSTRAP_HDRS_DIR)
 53	$(call QUIET_INSTALL, $@)
 54	$(Q)install -m 644 -t $(LIBBPF_BOOTSTRAP_HDRS_DIR) $<
 55
 56$(LIBBPF)-clean: FORCE | $(LIBBPF_OUTPUT)
 57	$(call QUIET_CLEAN, libbpf)
 58	$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_OUTPUT) clean >/dev/null
 59
 60$(LIBBPF_BOOTSTRAP)-clean: FORCE | $(LIBBPF_BOOTSTRAP_OUTPUT)
 61	$(call QUIET_CLEAN, libbpf-bootstrap)
 62	$(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_BOOTSTRAP_OUTPUT) clean >/dev/null
 63
 64prefix ?= /usr/local
 65bash_compdir ?= /usr/share/bash-completion/completions
 66
 67CFLAGS += -O2
 68CFLAGS += -W
 69CFLAGS += -Wall
 70CFLAGS += -Wextra
 71CFLAGS += -Wformat-signedness
 72CFLAGS += -Wno-unused-parameter
 73CFLAGS += -Wno-missing-field-initializers
 74CFLAGS += $(filter-out -Wswitch-enum -Wnested-externs,$(EXTRA_WARNINGS))
 75CFLAGS += -DPACKAGE='"bpftool"' -D__EXPORTED_HEADERS__ \
 76	-I$(or $(OUTPUT),.) \
 77	-I$(LIBBPF_INCLUDE) \
 78	-I$(srctree)/kernel/bpf/ \
 79	-I$(srctree)/tools/include \
 80	-I$(srctree)/tools/include/uapi
 81ifneq ($(BPFTOOL_VERSION),)
 82CFLAGS += -DBPFTOOL_VERSION='"$(BPFTOOL_VERSION)"'
 83endif
 84ifneq ($(EXTRA_CFLAGS),)
 85CFLAGS += $(EXTRA_CFLAGS)
 86endif
 87ifneq ($(EXTRA_LDFLAGS),)
 88LDFLAGS += $(EXTRA_LDFLAGS)
 89endif
 90
 91HOST_CFLAGS := $(subst -I$(LIBBPF_INCLUDE),-I$(LIBBPF_BOOTSTRAP_INCLUDE),\
 92		$(subst $(CLANG_CROSS_FLAGS),,$(CFLAGS)))
 93HOST_LDFLAGS := $(LDFLAGS)
 94
 95INSTALL ?= install
 96RM ?= rm -f
 97
 98FEATURE_USER = .bpftool
 99
100FEATURE_TESTS := clang-bpf-co-re
101FEATURE_TESTS += llvm
102FEATURE_TESTS += libcap
103FEATURE_TESTS += libbfd
104FEATURE_TESTS += libbfd-liberty
105FEATURE_TESTS += libbfd-liberty-z
106FEATURE_TESTS += disassembler-four-args
107FEATURE_TESTS += disassembler-init-styled
108FEATURE_TESTS += libelf-zstd
109
110FEATURE_DISPLAY := clang-bpf-co-re
111FEATURE_DISPLAY += llvm
112FEATURE_DISPLAY += libcap
113FEATURE_DISPLAY += libbfd
114FEATURE_DISPLAY += libbfd-liberty
115FEATURE_DISPLAY += libbfd-liberty-z
116
117check_feat := 1
118NON_CHECK_FEAT_TARGETS := clean uninstall doc doc-clean doc-install doc-uninstall
119ifdef MAKECMDGOALS
120ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
121  check_feat := 0
122endif
123endif
124
125ifeq ($(check_feat),1)
126ifeq ($(FEATURES_DUMP),)
127include $(srctree)/tools/build/Makefile.feature
128else
129include $(FEATURES_DUMP)
130endif
131endif
132
133LIBS = $(LIBBPF) -lelf -lcrypto -lz
134LIBS_BOOTSTRAP = $(LIBBPF_BOOTSTRAP) -lelf -lcrypto -lz
135
136ifeq ($(feature-libelf-zstd),1)
137LIBS += -lzstd
138LIBS_BOOTSTRAP += -lzstd
139endif
140
141ifeq ($(feature-libcap), 1)
142CFLAGS += -DUSE_LIBCAP
143LIBS += -lcap
144endif
145
146include $(wildcard $(OUTPUT)*.d)
147
148all: $(OUTPUT)bpftool
149
150SRCS := $(wildcard *.c)
151
152ifeq ($(feature-llvm),1)
153  # If LLVM is available, use it for JIT disassembly
154  CFLAGS  += -DHAVE_LLVM_SUPPORT
155  LLVM_CONFIG_LIB_COMPONENTS := mcdisassembler all-targets
156  # llvm-config always adds -D_GNU_SOURCE, however, it may already be in CFLAGS
157  # (e.g. when bpftool build is called from selftests build as selftests
158  # Makefile includes lib.mk which sets -D_GNU_SOURCE) which would cause
159  # compilation error due to redefinition. Let's filter it out here.
160  CFLAGS  += $(filter-out -D_GNU_SOURCE,$(shell $(LLVM_CONFIG) --cflags))
161  LIBS    += $(shell $(LLVM_CONFIG) --libs $(LLVM_CONFIG_LIB_COMPONENTS))
162  ifeq ($(shell $(LLVM_CONFIG) --shared-mode),static)
163    LIBS += $(shell $(LLVM_CONFIG) --system-libs $(LLVM_CONFIG_LIB_COMPONENTS))
164    LIBS += -lstdc++
165  endif
166  LDFLAGS += $(shell $(LLVM_CONFIG) --ldflags)
167else
168  # Fall back on libbfd
169  ifeq ($(feature-libbfd),1)
170    LIBS += -lbfd -ldl -lopcodes
171  else ifeq ($(feature-libbfd-liberty),1)
172    LIBS += -lbfd -ldl -lopcodes -liberty
173  else ifeq ($(feature-libbfd-liberty-z),1)
174    LIBS += -lbfd -ldl -lopcodes -liberty -lz
175  endif
176
177  # If one of the above feature combinations is set, we support libbfd
178  ifneq ($(filter -lbfd,$(LIBS)),)
179    CFLAGS += -DHAVE_LIBBFD_SUPPORT
180
181    # Libbfd interface changed over time, figure out what we need
182    ifeq ($(feature-disassembler-four-args), 1)
183      CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
184    endif
185    ifeq ($(feature-disassembler-init-styled), 1)
186      CFLAGS += -DDISASM_INIT_STYLED
187    endif
188  endif
189endif
190ifeq ($(filter -DHAVE_LLVM_SUPPORT -DHAVE_LIBBFD_SUPPORT,$(CFLAGS)),)
191  # No support for JIT disassembly
192  SRCS := $(filter-out jit_disasm.c,$(SRCS))
193endif
194
195BPFTOOL_BOOTSTRAP := $(BOOTSTRAP_OUTPUT)bpftool
196
197BOOTSTRAP_OBJS = $(addprefix $(BOOTSTRAP_OUTPUT),main.o common.o json_writer.o gen.o btf.o sign.o)
198$(BOOTSTRAP_OBJS): $(LIBBPF_BOOTSTRAP)
199
200OBJS = $(patsubst %.c,$(OUTPUT)%.o,$(SRCS)) $(OUTPUT)disasm.o
201$(OBJS): $(LIBBPF) $(LIBBPF_INTERNAL_HDRS)
202
203VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\
204		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\
205		     ../../../vmlinux					\
206		     /sys/kernel/btf/vmlinux				\
207		     /boot/vmlinux-$(shell uname -r)
208VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
209
210bootstrap: $(BPFTOOL_BOOTSTRAP)
211
212ifneq ($(VMLINUX_BTF)$(VMLINUX_H),)
213ifeq ($(feature-clang-bpf-co-re),1)
214
215BUILD_BPF_SKELS := 1
216
217ifeq ($(VMLINUX_H),)
218$(OUTPUT)vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL_BOOTSTRAP)
219	$(QUIET_GEN)$(BPFTOOL_BOOTSTRAP) btf dump file $< format c > $@
220else
221$(OUTPUT)vmlinux.h: $(VMLINUX_H)
222	$(Q)cp "$(VMLINUX_H)" $@
223endif
224
225$(OUTPUT)%.bpf.o: skeleton/%.bpf.c $(OUTPUT)vmlinux.h $(LIBBPF_BOOTSTRAP)
226	$(QUIET_CLANG)$(CLANG) \
227		-Wno-microsoft-anon-tag \
228		-fms-extensions \
229		-I$(or $(OUTPUT),.) \
230		-I$(srctree)/tools/include/uapi/ \
231		-I$(LIBBPF_BOOTSTRAP_INCLUDE) \
232		-g -O2 -Wall -fno-stack-protector \
233		--target=bpf -c $< -o $@
234	$(Q)$(LLVM_STRIP) -g $@
235
236$(OUTPUT)%.skel.h: $(OUTPUT)%.bpf.o $(BPFTOOL_BOOTSTRAP)
237	$(QUIET_GEN)$(BPFTOOL_BOOTSTRAP) gen skeleton $< > $@
238
239$(OUTPUT)prog.o: $(OUTPUT)profiler.skel.h
240
241$(OUTPUT)pids.o: $(OUTPUT)pid_iter.skel.h
242
243endif
244endif
245
246CFLAGS += $(if $(BUILD_BPF_SKELS),,-DBPFTOOL_WITHOUT_SKELETONS)
247
248$(OUTPUT)disasm.o: $(srctree)/kernel/bpf/disasm.c
249	$(QUIET_CC)$(CC) $(CFLAGS) -c -MMD $< -o $@
250
251$(BPFTOOL_BOOTSTRAP): $(BOOTSTRAP_OBJS) $(LIBBPF_BOOTSTRAP)
252	$(QUIET_LINK)$(HOSTCC) $(HOST_CFLAGS) $(HOST_LDFLAGS) $(BOOTSTRAP_OBJS) $(LIBS_BOOTSTRAP) -o $@
253
254$(OUTPUT)bpftool: $(OBJS) $(LIBBPF)
255	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(OBJS) $(LIBS) -o $@
256
257$(BOOTSTRAP_OUTPUT)%.o: %.c $(LIBBPF_BOOTSTRAP_INTERNAL_HDRS) | $(BOOTSTRAP_OUTPUT)
258	$(QUIET_CC)$(HOSTCC) $(HOST_CFLAGS) -c -MMD $< -o $@
259
260$(OUTPUT)%.o: %.c
261	$(QUIET_CC)$(CC) $(CFLAGS) -c -MMD $< -o $@
262
263feature-detect-clean:
264	$(call QUIET_CLEAN, feature-detect)
265	$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
266
267clean: $(LIBBPF)-clean $(LIBBPF_BOOTSTRAP)-clean feature-detect-clean
268	$(call QUIET_CLEAN, bpftool)
269	$(Q)$(RM) -- $(OUTPUT)bpftool $(OUTPUT)*.o $(OUTPUT)*.d
270	$(Q)$(RM) -- $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h
271	$(Q)$(RM) -r -- $(LIBBPF_OUTPUT) $(BOOTSTRAP_OUTPUT)
272	$(call QUIET_CLEAN, core-gen)
273	$(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.bpftool
274	$(Q)$(RM) -r -- $(OUTPUT)feature/
275
276install-bin: $(OUTPUT)bpftool
277	$(call QUIET_INSTALL, bpftool)
278	$(Q)$(INSTALL) -m 0755 -d $(DESTDIR)$(prefix)/sbin
279	$(Q)$(INSTALL) $(OUTPUT)bpftool $(DESTDIR)$(prefix)/sbin/bpftool
280
281install: install-bin
282	$(Q)$(INSTALL) -m 0755 -d $(DESTDIR)$(bash_compdir)
283	$(Q)$(INSTALL) -m 0644 bash-completion/bpftool $(DESTDIR)$(bash_compdir)
284
285uninstall:
286	$(call QUIET_UNINST, bpftool)
287	$(Q)$(RM) -- $(DESTDIR)$(prefix)/sbin/bpftool
288	$(Q)$(RM) -- $(DESTDIR)$(bash_compdir)/bpftool
289
290doc:
291	$(call descend,Documentation)
292
293doc-clean:
294	$(call descend,Documentation,clean)
295
296doc-install:
297	$(call descend,Documentation,install)
298
299doc-uninstall:
300	$(call descend,Documentation,uninstall)
301
302FORCE:
303
304.SECONDARY:
305.PHONY: all FORCE bootstrap clean install-bin install uninstall
306.PHONY: doc doc-clean doc-install doc-uninstall
307.DEFAULT_GOAL := all
308
309# Delete partially updated (corrupted) files on error
310.DELETE_ON_ERROR: