projects/linux·blob master · refs

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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)" \
51 CFLAGS="$(LIBBPF_BOOTSTRAP_CFLAGS)" EXTRA_CFLAGS= $@ install_headers
52
53$(LIBBPF_BOOTSTRAP_INTERNAL_HDRS): $(LIBBPF_BOOTSTRAP_HDRS_DIR)/%.h: $(BPF_DIR)/%.h | $(LIBBPF_BOOTSTRAP_HDRS_DIR)
54 $(call QUIET_INSTALL, $@)
55 $(Q)install -m 644 -t $(LIBBPF_BOOTSTRAP_HDRS_DIR) $<
56
57$(LIBBPF)-clean: FORCE | $(LIBBPF_OUTPUT)
58 $(call QUIET_CLEAN, libbpf)
59 $(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_OUTPUT) clean >/dev/null
60
61$(LIBBPF_BOOTSTRAP)-clean: FORCE | $(LIBBPF_BOOTSTRAP_OUTPUT)
62 $(call QUIET_CLEAN, libbpf-bootstrap)
63 $(Q)$(MAKE) -C $(BPF_DIR) OUTPUT=$(LIBBPF_BOOTSTRAP_OUTPUT) clean >/dev/null
64
65prefix ?= /usr/local
66bash_compdir ?= /usr/share/bash-completion/completions
67
68CFLAGS += -O2
69CFLAGS += -W
70CFLAGS += -Wall
71CFLAGS += -Wextra
72CFLAGS += -Wformat-signedness
73CFLAGS += -Wno-unused-parameter
74CFLAGS += -Wno-missing-field-initializers
75CFLAGS += $(filter-out -Wswitch-enum -Wnested-externs,$(EXTRA_WARNINGS))
76CFLAGS += -DPACKAGE='"bpftool"' -D__EXPORTED_HEADERS__ \
77 -I$(or $(OUTPUT),.) \
78 -I$(LIBBPF_INCLUDE) \
79 -I$(srctree)/kernel/bpf/ \
80 -I$(srctree)/tools/include \
81 -I$(srctree)/tools/include/uapi
82ifneq ($(BPFTOOL_VERSION),)
83CFLAGS += -DBPFTOOL_VERSION='"$(BPFTOOL_VERSION)"'
84endif
85
86# This must be done before appending EXTRA_CFLAGS to CFLAGS to avoid
87# including flags that are not applicable to the host compiler.
88HOST_CFLAGS := $(subst -I$(LIBBPF_INCLUDE),-I$(LIBBPF_BOOTSTRAP_INCLUDE),\
89 $(subst $(CLANG_CROSS_FLAGS),,$(CFLAGS)))
90HOST_CFLAGS += $(HOST_EXTRACFLAGS)
91
92ifneq ($(EXTRA_CFLAGS),)
93CFLAGS += $(EXTRA_CFLAGS)
94endif
95ifneq ($(EXTRA_LDFLAGS),)
96LDFLAGS += $(EXTRA_LDFLAGS)
97endif
98
99HOST_LDFLAGS := $(LDFLAGS)
100
101# Remove warnings for libbpf bootstrap build
102LIBBPF_BOOTSTRAP_CFLAGS := $(filter-out -W -Wall -Wextra -Wformat%,$(HOST_CFLAGS))
103
104INSTALL ?= install
105RM ?= rm -f
106
107FEATURE_USER = .bpftool
108
109# Skip optional dependencies: LLVM (JIT disasm), libbfd (fallback
110# disasm), libcrypto (program signing).
111SKIP_LLVM ?=
112SKIP_LIBBFD ?=
113SKIP_CRYPTO ?=
114ifneq ($(SKIP_CRYPTO),1)
115 CRYPTO_LIBS := -lcrypto
116endif
117
118ifeq ($(MAKECMDGOALS),bootstrap)
119FEATURE_TESTS := libelf-zstd
120FEATURE_DISPLAY :=
121else
122FEATURE_TESTS := clang-bpf-co-re
123FEATURE_TESTS += llvm
124FEATURE_TESTS += libcap
125FEATURE_TESTS += libbfd
126FEATURE_TESTS += libbfd-liberty
127FEATURE_TESTS += libbfd-liberty-z
128FEATURE_TESTS += disassembler-four-args
129FEATURE_TESTS += disassembler-init-styled
130FEATURE_TESTS += libelf-zstd
131
132FEATURE_DISPLAY := clang-bpf-co-re
133FEATURE_DISPLAY += llvm
134FEATURE_DISPLAY += libcap
135FEATURE_DISPLAY += libbfd
136FEATURE_DISPLAY += libbfd-liberty
137FEATURE_DISPLAY += libbfd-liberty-z
138endif
139
140check_feat := 1
141NON_CHECK_FEAT_TARGETS := clean uninstall doc doc-clean doc-install doc-uninstall
142ifdef MAKECMDGOALS
143ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),)
144 check_feat := 0
145endif
146endif
147
148ifeq ($(check_feat),1)
149ifeq ($(FEATURES_DUMP),)
150include $(srctree)/tools/build/Makefile.feature
151else
152include $(FEATURES_DUMP)
153endif
154endif
155
156LIBS = $(LIBBPF) -lelf $(CRYPTO_LIBS) -lz
157LIBS_BOOTSTRAP = $(LIBBPF_BOOTSTRAP) -lelf $(CRYPTO_LIBS) -lz
158
159ifeq ($(feature-libelf-zstd),1)
160LIBS += -lzstd
161LIBS_BOOTSTRAP += -lzstd
162endif
163
164ifeq ($(feature-libcap), 1)
165CFLAGS += -DUSE_LIBCAP
166LIBS += -lcap
167endif
168
169include $(wildcard $(OUTPUT)*.d)
170
171all: $(OUTPUT)bpftool
172
173SRCS := $(wildcard *.c)
174
175ifeq ($(feature-llvm),1)
176ifneq ($(SKIP_LLVM),1)
177HAS_LLVM := 1
178endif
179endif
180
181ifeq ($(HAS_LLVM),1)
182 CFLAGS += -DHAVE_LLVM_SUPPORT
183 LLVM_CONFIG_LIB_COMPONENTS := mcdisassembler all-targets
184 # llvm-config always adds -D_GNU_SOURCE, however, it may already be in CFLAGS
185 # (e.g. when bpftool build is called from selftests build as selftests
186 # Makefile includes lib.mk which sets -D_GNU_SOURCE) which would cause
187 # compilation error due to redefinition. Let's filter it out here.
188 CFLAGS += $(filter-out -D_GNU_SOURCE,$(shell $(LLVM_CONFIG) --cflags))
189 LIBS += $(shell $(LLVM_CONFIG) --libs $(LLVM_CONFIG_LIB_COMPONENTS))
190 ifeq ($(shell $(LLVM_CONFIG) --shared-mode),static)
191 LIBS += $(shell $(LLVM_CONFIG) --system-libs $(LLVM_CONFIG_LIB_COMPONENTS))
192 LIBS += -lstdc++
193 endif
194 LDFLAGS += $(shell $(LLVM_CONFIG) --ldflags)
195else
196 ifneq ($(SKIP_LIBBFD),1)
197 # Fall back on libbfd
198 ifeq ($(feature-libbfd),1)
199 LIBS += -lbfd -ldl -lopcodes
200 else ifeq ($(feature-libbfd-liberty),1)
201 LIBS += -lbfd -ldl -lopcodes -liberty
202 else ifeq ($(feature-libbfd-liberty-z),1)
203 LIBS += -lbfd -ldl -lopcodes -liberty -lz
204 endif
205
206 # If one of the above feature combinations is set, we support libbfd
207 ifneq ($(filter -lbfd,$(LIBS)),)
208 CFLAGS += -DHAVE_LIBBFD_SUPPORT
209
210 # Libbfd interface changed over time, figure out what we need
211 ifeq ($(feature-disassembler-four-args), 1)
212 CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
213 endif
214 ifeq ($(feature-disassembler-init-styled), 1)
215 CFLAGS += -DDISASM_INIT_STYLED
216 endif
217 endif
218 endif # SKIP_LIBBFD
219endif
220ifeq ($(filter -DHAVE_LLVM_SUPPORT -DHAVE_LIBBFD_SUPPORT,$(CFLAGS)),)
221 # No support for JIT disassembly
222 SRCS := $(filter-out jit_disasm.c,$(SRCS))
223endif
224
225ifeq ($(SKIP_CRYPTO),1)
226 CFLAGS += -DBPFTOOL_WITHOUT_CRYPTO
227 HOST_CFLAGS += -DBPFTOOL_WITHOUT_CRYPTO
228 SRCS := $(filter-out sign.c,$(SRCS))
229endif
230
231BPFTOOL_BOOTSTRAP := $(BOOTSTRAP_OUTPUT)bpftool
232
233BOOTSTRAP_OBJS = $(addprefix $(BOOTSTRAP_OUTPUT),main.o common.o json_writer.o gen.o btf.o $(if $(CRYPTO_LIBS),sign.o))
234$(BOOTSTRAP_OBJS): $(LIBBPF_BOOTSTRAP)
235
236OBJS = $(patsubst %.c,$(OUTPUT)%.o,$(SRCS)) $(OUTPUT)disasm.o
237$(OBJS): $(LIBBPF) $(LIBBPF_INTERNAL_HDRS)
238
239VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
240 $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
241 ../../../vmlinux \
242 /sys/kernel/btf/vmlinux \
243 /boot/vmlinux-$(shell uname -r)
244VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
245
246bootstrap: $(BPFTOOL_BOOTSTRAP)
247
248ifneq ($(VMLINUX_BTF)$(VMLINUX_H),)
249ifeq ($(feature-clang-bpf-co-re),1)
250
251BUILD_BPF_SKELS := 1
252
253ifeq ($(VMLINUX_H),)
254$(OUTPUT)vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL_BOOTSTRAP)
255 $(QUIET_GEN)$(BPFTOOL_BOOTSTRAP) btf dump file $< format c > $@
256else
257$(OUTPUT)vmlinux.h: $(VMLINUX_H)
258 $(Q)cp "$(VMLINUX_H)" $@
259endif
260
261$(OUTPUT)%.bpf.o: skeleton/%.bpf.c $(OUTPUT)vmlinux.h $(LIBBPF_BOOTSTRAP)
262 $(QUIET_CLANG)$(CLANG) \
263 -Wno-microsoft-anon-tag \
264 -fms-extensions \
265 -I$(or $(OUTPUT),.) \
266 -I$(srctree)/tools/include/uapi/ \
267 -I$(LIBBPF_BOOTSTRAP_INCLUDE) \
268 -g -O2 -Wall -fno-stack-protector \
269 --target=bpf -c $< -o $@
270 $(Q)$(LLVM_STRIP) -g $@
271
272$(OUTPUT)%.skel.h: $(OUTPUT)%.bpf.o $(BPFTOOL_BOOTSTRAP)
273 $(QUIET_GEN)$(BPFTOOL_BOOTSTRAP) gen skeleton $< > $@
274
275$(OUTPUT)prog.o: $(OUTPUT)profiler.skel.h
276
277$(OUTPUT)pids.o: $(OUTPUT)pid_iter.skel.h
278
279endif
280endif
281
282CFLAGS += $(if $(BUILD_BPF_SKELS),,-DBPFTOOL_WITHOUT_SKELETONS)
283
284$(OUTPUT)disasm.o: $(srctree)/kernel/bpf/disasm.c
285 $(QUIET_CC)$(CC) $(CFLAGS) -c -MMD $< -o $@
286
287$(BPFTOOL_BOOTSTRAP): $(BOOTSTRAP_OBJS) $(LIBBPF_BOOTSTRAP)
288 $(QUIET_LINK)$(HOSTCC) $(HOST_CFLAGS) $(HOST_LDFLAGS) $(BOOTSTRAP_OBJS) $(LIBS_BOOTSTRAP) -o $@
289
290$(OUTPUT)bpftool: $(OBJS) $(LIBBPF)
291 $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(OBJS) $(LIBS) -o $@
292
293$(BOOTSTRAP_OUTPUT)%.o: %.c $(LIBBPF_BOOTSTRAP_INTERNAL_HDRS) | $(BOOTSTRAP_OUTPUT)
294 $(QUIET_CC)$(HOSTCC) $(HOST_CFLAGS) -c -MMD $< -o $@
295
296$(OUTPUT)%.o: %.c
297 $(QUIET_CC)$(CC) $(CFLAGS) -c -MMD $< -o $@
298
299feature-detect-clean:
300 $(call QUIET_CLEAN, feature-detect)
301 $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
302
303clean: $(LIBBPF)-clean $(LIBBPF_BOOTSTRAP)-clean feature-detect-clean
304 $(call QUIET_CLEAN, bpftool)
305 $(Q)$(RM) -- $(OUTPUT)bpftool $(OUTPUT)*.o $(OUTPUT)*.d
306 $(Q)$(RM) -- $(OUTPUT)*.skel.h $(OUTPUT)vmlinux.h
307 $(Q)$(RM) -r -- $(LIBBPF_OUTPUT) $(BOOTSTRAP_OUTPUT)
308 $(call QUIET_CLEAN, core-gen)
309 $(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.bpftool
310 $(Q)$(RM) -r -- $(OUTPUT)feature/
311
312install-bin: $(OUTPUT)bpftool
313 $(call QUIET_INSTALL, bpftool)
314 $(Q)$(INSTALL) -m 0755 -d $(DESTDIR)$(prefix)/sbin
315 $(Q)$(INSTALL) $(OUTPUT)bpftool $(DESTDIR)$(prefix)/sbin/bpftool
316
317install: install-bin
318 $(Q)$(INSTALL) -m 0755 -d $(DESTDIR)$(bash_compdir)
319 $(Q)$(INSTALL) -m 0644 bash-completion/bpftool $(DESTDIR)$(bash_compdir)
320
321uninstall:
322 $(call QUIET_UNINST, bpftool)
323 $(Q)$(RM) -- $(DESTDIR)$(prefix)/sbin/bpftool
324 $(Q)$(RM) -- $(DESTDIR)$(bash_compdir)/bpftool
325
326doc:
327 $(call descend,Documentation)
328
329doc-clean:
330 $(call descend,Documentation,clean)
331
332doc-install:
333 $(call descend,Documentation,install)
334
335doc-uninstall:
336 $(call descend,Documentation,uninstall)
337
338FORCE:
339
340.SECONDARY:
341.PHONY: all FORCE bootstrap clean install-bin install uninstall
342.PHONY: doc doc-clean doc-install doc-uninstall
343.DEFAULT_GOAL := all
344
345# Delete partially updated (corrupted) files on error
346.DELETE_ON_ERROR: