Makefile 16 KB

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  1. # SPDX-License-Identifier: GPL-2.0
  2. BPF_SAMPLES_PATH ?= $(abspath $(srctree)/$(src))
  3. TOOLS_PATH := $(BPF_SAMPLES_PATH)/../../tools
  4. pound := \#
  5. # List of programs to build
  6. tprogs-y := test_lru_dist
  7. tprogs-y += sock_example
  8. tprogs-y += fds_example
  9. tprogs-y += sockex1
  10. tprogs-y += sockex2
  11. tprogs-y += sockex3
  12. tprogs-y += tracex1
  13. tprogs-y += tracex2
  14. tprogs-y += tracex3
  15. tprogs-y += tracex4
  16. tprogs-y += tracex5
  17. tprogs-y += tracex6
  18. tprogs-y += tracex7
  19. tprogs-y += test_probe_write_user
  20. tprogs-y += trace_output
  21. tprogs-y += lathist
  22. tprogs-y += offwaketime
  23. tprogs-y += spintest
  24. tprogs-y += map_perf_test
  25. tprogs-y += test_overhead
  26. tprogs-y += test_cgrp2_array_pin
  27. tprogs-y += test_cgrp2_attach
  28. tprogs-y += test_cgrp2_sock
  29. tprogs-y += test_cgrp2_sock2
  30. tprogs-y += xdp1
  31. tprogs-y += xdp2
  32. tprogs-y += xdp_router_ipv4
  33. tprogs-y += test_current_task_under_cgroup
  34. tprogs-y += trace_event
  35. tprogs-y += sampleip
  36. tprogs-y += tc_l2_redirect
  37. tprogs-y += lwt_len_hist
  38. tprogs-y += xdp_tx_iptunnel
  39. tprogs-y += test_map_in_map
  40. tprogs-y += per_socket_stats_example
  41. tprogs-y += xdp_rxq_info
  42. tprogs-y += syscall_tp
  43. tprogs-y += cpustat
  44. tprogs-y += xdp_adjust_tail
  45. tprogs-y += xdp_fwd
  46. tprogs-y += task_fd_query
  47. tprogs-y += xdp_sample_pkts
  48. tprogs-y += ibumad
  49. tprogs-y += hbm
  50. tprogs-y += xdp_redirect_cpu
  51. tprogs-y += xdp_redirect_map_multi
  52. tprogs-y += xdp_redirect_map
  53. tprogs-y += xdp_redirect
  54. tprogs-y += xdp_monitor
  55. # Libbpf dependencies
  56. LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf
  57. LIBBPF_OUTPUT = $(abspath $(BPF_SAMPLES_PATH))/libbpf
  58. LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
  59. LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
  60. LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
  61. CGROUP_HELPERS := ../../tools/testing/selftests/bpf/cgroup_helpers.o
  62. TRACE_HELPERS := ../../tools/testing/selftests/bpf/trace_helpers.o
  63. XDP_SAMPLE := xdp_sample_user.o
  64. fds_example-objs := fds_example.o
  65. sockex1-objs := sockex1_user.o
  66. sockex2-objs := sockex2_user.o
  67. sockex3-objs := sockex3_user.o
  68. tracex1-objs := tracex1_user.o $(TRACE_HELPERS)
  69. tracex2-objs := tracex2_user.o
  70. tracex3-objs := tracex3_user.o
  71. tracex4-objs := tracex4_user.o
  72. tracex5-objs := tracex5_user.o $(TRACE_HELPERS)
  73. tracex6-objs := tracex6_user.o
  74. tracex7-objs := tracex7_user.o
  75. test_probe_write_user-objs := test_probe_write_user_user.o
  76. trace_output-objs := trace_output_user.o
  77. lathist-objs := lathist_user.o
  78. offwaketime-objs := offwaketime_user.o $(TRACE_HELPERS)
  79. spintest-objs := spintest_user.o $(TRACE_HELPERS)
  80. map_perf_test-objs := map_perf_test_user.o
  81. test_overhead-objs := test_overhead_user.o
  82. test_cgrp2_array_pin-objs := test_cgrp2_array_pin.o
  83. test_cgrp2_attach-objs := test_cgrp2_attach.o
  84. test_cgrp2_sock-objs := test_cgrp2_sock.o
  85. test_cgrp2_sock2-objs := test_cgrp2_sock2.o
  86. xdp1-objs := xdp1_user.o
  87. # reuse xdp1 source intentionally
  88. xdp2-objs := xdp1_user.o
  89. test_current_task_under_cgroup-objs := $(CGROUP_HELPERS) \
  90. test_current_task_under_cgroup_user.o
  91. trace_event-objs := trace_event_user.o $(TRACE_HELPERS)
  92. sampleip-objs := sampleip_user.o $(TRACE_HELPERS)
  93. tc_l2_redirect-objs := tc_l2_redirect_user.o
  94. lwt_len_hist-objs := lwt_len_hist_user.o
  95. xdp_tx_iptunnel-objs := xdp_tx_iptunnel_user.o
  96. test_map_in_map-objs := test_map_in_map_user.o
  97. per_socket_stats_example-objs := cookie_uid_helper_example.o
  98. xdp_rxq_info-objs := xdp_rxq_info_user.o
  99. syscall_tp-objs := syscall_tp_user.o
  100. cpustat-objs := cpustat_user.o
  101. xdp_adjust_tail-objs := xdp_adjust_tail_user.o
  102. xdp_fwd-objs := xdp_fwd_user.o
  103. task_fd_query-objs := task_fd_query_user.o $(TRACE_HELPERS)
  104. xdp_sample_pkts-objs := xdp_sample_pkts_user.o
  105. ibumad-objs := ibumad_user.o
  106. hbm-objs := hbm.o $(CGROUP_HELPERS)
  107. xdp_redirect_map_multi-objs := xdp_redirect_map_multi_user.o $(XDP_SAMPLE)
  108. xdp_redirect_cpu-objs := xdp_redirect_cpu_user.o $(XDP_SAMPLE)
  109. xdp_redirect_map-objs := xdp_redirect_map_user.o $(XDP_SAMPLE)
  110. xdp_redirect-objs := xdp_redirect_user.o $(XDP_SAMPLE)
  111. xdp_monitor-objs := xdp_monitor_user.o $(XDP_SAMPLE)
  112. xdp_router_ipv4-objs := xdp_router_ipv4_user.o $(XDP_SAMPLE)
  113. # Tell kbuild to always build the programs
  114. always-y := $(tprogs-y)
  115. always-y += sockex1_kern.o
  116. always-y += sockex2_kern.o
  117. always-y += sockex3_kern.o
  118. always-y += tracex1_kern.o
  119. always-y += tracex2_kern.o
  120. always-y += tracex3_kern.o
  121. always-y += tracex4_kern.o
  122. always-y += tracex5_kern.o
  123. always-y += tracex6_kern.o
  124. always-y += tracex7_kern.o
  125. always-y += sock_flags_kern.o
  126. always-y += test_probe_write_user_kern.o
  127. always-y += trace_output_kern.o
  128. always-y += tcbpf1_kern.o
  129. always-y += tc_l2_redirect_kern.o
  130. always-y += lathist_kern.o
  131. always-y += offwaketime_kern.o
  132. always-y += spintest_kern.o
  133. always-y += map_perf_test_kern.o
  134. always-y += test_overhead_tp_kern.o
  135. always-y += test_overhead_raw_tp_kern.o
  136. always-y += test_overhead_kprobe_kern.o
  137. always-y += parse_varlen.o parse_simple.o parse_ldabs.o
  138. always-y += test_cgrp2_tc_kern.o
  139. always-y += xdp1_kern.o
  140. always-y += xdp2_kern.o
  141. always-y += test_current_task_under_cgroup_kern.o
  142. always-y += trace_event_kern.o
  143. always-y += sampleip_kern.o
  144. always-y += lwt_len_hist_kern.o
  145. always-y += xdp_tx_iptunnel_kern.o
  146. always-y += test_map_in_map_kern.o
  147. always-y += tcp_synrto_kern.o
  148. always-y += tcp_rwnd_kern.o
  149. always-y += tcp_bufs_kern.o
  150. always-y += tcp_cong_kern.o
  151. always-y += tcp_iw_kern.o
  152. always-y += tcp_clamp_kern.o
  153. always-y += tcp_basertt_kern.o
  154. always-y += tcp_tos_reflect_kern.o
  155. always-y += tcp_dumpstats_kern.o
  156. always-y += xdp_rxq_info_kern.o
  157. always-y += xdp2skb_meta_kern.o
  158. always-y += syscall_tp_kern.o
  159. always-y += cpustat_kern.o
  160. always-y += xdp_adjust_tail_kern.o
  161. always-y += xdp_fwd_kern.o
  162. always-y += task_fd_query_kern.o
  163. always-y += xdp_sample_pkts_kern.o
  164. always-y += ibumad_kern.o
  165. always-y += hbm_out_kern.o
  166. always-y += hbm_edt_kern.o
  167. ifeq ($(ARCH), arm)
  168. # Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux
  169. # headers when arm instruction set identification is requested.
  170. ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS))
  171. BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR)
  172. TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR)
  173. endif
  174. ifeq ($(ARCH), mips)
  175. TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__
  176. ifdef CONFIG_MACH_LOONGSON64
  177. BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-loongson64
  178. BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-generic
  179. endif
  180. endif
  181. TPROGS_CFLAGS += -Wall -O2
  182. TPROGS_CFLAGS += -Wmissing-prototypes
  183. TPROGS_CFLAGS += -Wstrict-prototypes
  184. TPROGS_CFLAGS += -I$(objtree)/usr/include
  185. TPROGS_CFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
  186. TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE)
  187. TPROGS_CFLAGS += -I$(srctree)/tools/include
  188. TPROGS_CFLAGS += -I$(srctree)/tools/perf
  189. TPROGS_CFLAGS += -DHAVE_ATTR_TEST=0
  190. ifdef SYSROOT
  191. TPROGS_CFLAGS += --sysroot=$(SYSROOT)
  192. TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib
  193. endif
  194. TPROGS_LDLIBS += $(LIBBPF) -lelf -lz
  195. TPROGLDLIBS_xdp_monitor += -lm
  196. TPROGLDLIBS_xdp_redirect += -lm
  197. TPROGLDLIBS_xdp_redirect_cpu += -lm
  198. TPROGLDLIBS_xdp_redirect_map += -lm
  199. TPROGLDLIBS_xdp_redirect_map_multi += -lm
  200. TPROGLDLIBS_xdp_router_ipv4 += -lm -pthread
  201. TPROGLDLIBS_tracex4 += -lrt
  202. TPROGLDLIBS_trace_output += -lrt
  203. TPROGLDLIBS_map_perf_test += -lrt
  204. TPROGLDLIBS_test_overhead += -lrt
  205. # Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
  206. # make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clang
  207. LLC ?= llc
  208. CLANG ?= clang
  209. OPT ?= opt
  210. LLVM_DIS ?= llvm-dis
  211. LLVM_OBJCOPY ?= llvm-objcopy
  212. LLVM_READELF ?= llvm-readelf
  213. BTF_PAHOLE ?= pahole
  214. # Detect that we're cross compiling and use the cross compiler
  215. ifdef CROSS_COMPILE
  216. CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%))
  217. endif
  218. # Don't evaluate probes and warnings if we need to run make recursively
  219. ifneq ($(src),)
  220. HDR_PROBE := $(shell printf "$(pound)include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \
  221. $(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c - \
  222. -o /dev/null 2>/dev/null && echo okay)
  223. ifeq ($(HDR_PROBE),)
  224. $(warning WARNING: Detected possible issues with include path.)
  225. $(warning WARNING: Please install kernel headers locally (make headers_install).)
  226. endif
  227. BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
  228. BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
  229. BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
  230. BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
  231. $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
  232. $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \
  233. /bin/rm -f ./llvm_btf_verify.o)
  234. BPF_EXTRA_CFLAGS += -fno-stack-protector
  235. ifneq ($(BTF_LLVM_PROBE),)
  236. BPF_EXTRA_CFLAGS += -g
  237. else
  238. ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),)
  239. BPF_EXTRA_CFLAGS += -g
  240. LLC_FLAGS += -mattr=dwarfris
  241. DWARF2BTF = y
  242. endif
  243. endif
  244. endif
  245. # Trick to allow make to be run from this directory
  246. all:
  247. $(MAKE) -C ../../ M=$(CURDIR) BPF_SAMPLES_PATH=$(CURDIR)
  248. clean:
  249. $(MAKE) -C ../../ M=$(CURDIR) clean
  250. @find $(CURDIR) -type f -name '*~' -delete
  251. @$(RM) -r $(CURDIR)/libbpf $(CURDIR)/bpftool
  252. $(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
  253. # Fix up variables inherited from Kbuild that tools/ build system won't like
  254. $(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \
  255. LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(BPF_SAMPLES_PATH)/../../ \
  256. O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \
  257. $@ install_headers
  258. BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool
  259. BPFTOOL_OUTPUT := $(abspath $(BPF_SAMPLES_PATH))/bpftool
  260. BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
  261. $(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) | $(BPFTOOL_OUTPUT)
  262. $(MAKE) -C $(BPFTOOLDIR) srctree=$(BPF_SAMPLES_PATH)/../../ \
  263. OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
  264. $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
  265. $(call msg,MKDIR,$@)
  266. $(Q)mkdir -p $@
  267. $(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE
  268. $(call filechk,offsets,__SYSCALL_NRS_H__)
  269. targets += syscall_nrs.s
  270. clean-files += syscall_nrs.h
  271. FORCE:
  272. # Verify LLVM compiler tools are available and bpf target is supported by llc
  273. .PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
  274. verify_cmds: $(CLANG) $(LLC)
  275. @for TOOL in $^ ; do \
  276. if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
  277. echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
  278. exit 1; \
  279. else true; fi; \
  280. done
  281. verify_target_bpf: verify_cmds
  282. @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \
  283. echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\
  284. echo " NOTICE: LLVM version >= 3.7.1 required" ;\
  285. exit 2; \
  286. else true; fi
  287. $(BPF_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)
  288. $(src)/*.c: verify_target_bpf $(LIBBPF)
  289. libbpf_hdrs: $(LIBBPF)
  290. $(obj)/$(TRACE_HELPERS) $(obj)/$(CGROUP_HELPERS) $(obj)/$(XDP_SAMPLE): | libbpf_hdrs
  291. .PHONY: libbpf_hdrs
  292. $(obj)/xdp_redirect_cpu_user.o: $(obj)/xdp_redirect_cpu.skel.h
  293. $(obj)/xdp_redirect_map_multi_user.o: $(obj)/xdp_redirect_map_multi.skel.h
  294. $(obj)/xdp_redirect_map_user.o: $(obj)/xdp_redirect_map.skel.h
  295. $(obj)/xdp_redirect_user.o: $(obj)/xdp_redirect.skel.h
  296. $(obj)/xdp_monitor_user.o: $(obj)/xdp_monitor.skel.h
  297. $(obj)/xdp_router_ipv4_user.o: $(obj)/xdp_router_ipv4.skel.h
  298. $(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h
  299. $(obj)/hbm_out_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
  300. $(obj)/hbm.o: $(src)/hbm.h
  301. $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
  302. # Override includes for xdp_sample_user.o because $(srctree)/usr/include in
  303. # TPROGS_CFLAGS causes conflicts
  304. XDP_SAMPLE_CFLAGS += -Wall -O2 \
  305. -I$(src)/../../tools/include \
  306. -I$(src)/../../tools/include/uapi \
  307. -I$(LIBBPF_INCLUDE) \
  308. -I$(src)/../../tools/testing/selftests/bpf
  309. $(obj)/$(XDP_SAMPLE): TPROGS_CFLAGS = $(XDP_SAMPLE_CFLAGS)
  310. $(obj)/$(XDP_SAMPLE): $(src)/xdp_sample_user.h $(src)/xdp_sample_shared.h
  311. -include $(BPF_SAMPLES_PATH)/Makefile.target
  312. VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux)) \
  313. $(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \
  314. $(abspath ./vmlinux)
  315. VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
  316. $(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)
  317. ifeq ($(VMLINUX_H),)
  318. ifeq ($(VMLINUX_BTF),)
  319. $(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\
  320. build the kernel or set VMLINUX_BTF or VMLINUX_H variable)
  321. endif
  322. $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
  323. else
  324. $(Q)cp "$(VMLINUX_H)" $@
  325. endif
  326. clean-files += vmlinux.h
  327. # Get Clang's default includes on this system, as opposed to those seen by
  328. # '-target bpf'. This fixes "missing" files on some architectures/distros,
  329. # such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
  330. #
  331. # Use '-idirafter': Don't interfere with include mechanics except where the
  332. # build would have failed anyways.
  333. define get_sys_includes
  334. $(shell $(1) -v -E - </dev/null 2>&1 \
  335. | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
  336. $(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' | sed 's/#define /-D/' | sed 's/ /=/')
  337. endef
  338. CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
  339. $(obj)/xdp_redirect_cpu.bpf.o: $(obj)/xdp_sample.bpf.o
  340. $(obj)/xdp_redirect_map_multi.bpf.o: $(obj)/xdp_sample.bpf.o
  341. $(obj)/xdp_redirect_map.bpf.o: $(obj)/xdp_sample.bpf.o
  342. $(obj)/xdp_redirect.bpf.o: $(obj)/xdp_sample.bpf.o
  343. $(obj)/xdp_monitor.bpf.o: $(obj)/xdp_sample.bpf.o
  344. $(obj)/xdp_router_ipv4.bpf.o: $(obj)/xdp_sample.bpf.o
  345. $(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h $(src)/xdp_sample.bpf.h $(src)/xdp_sample_shared.h
  346. @echo " CLANG-BPF " $@
  347. $(Q)$(CLANG) -g -O2 -target bpf -D__TARGET_ARCH_$(SRCARCH) \
  348. -Wno-compare-distinct-pointer-types -I$(srctree)/include \
  349. -I$(srctree)/samples/bpf -I$(srctree)/tools/include \
  350. -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \
  351. -c $(filter %.bpf.c,$^) -o $@
  352. LINKED_SKELS := xdp_redirect_cpu.skel.h xdp_redirect_map_multi.skel.h \
  353. xdp_redirect_map.skel.h xdp_redirect.skel.h xdp_monitor.skel.h \
  354. xdp_router_ipv4.skel.h
  355. clean-files += $(LINKED_SKELS)
  356. xdp_redirect_cpu.skel.h-deps := xdp_redirect_cpu.bpf.o xdp_sample.bpf.o
  357. xdp_redirect_map_multi.skel.h-deps := xdp_redirect_map_multi.bpf.o xdp_sample.bpf.o
  358. xdp_redirect_map.skel.h-deps := xdp_redirect_map.bpf.o xdp_sample.bpf.o
  359. xdp_redirect.skel.h-deps := xdp_redirect.bpf.o xdp_sample.bpf.o
  360. xdp_monitor.skel.h-deps := xdp_monitor.bpf.o xdp_sample.bpf.o
  361. xdp_router_ipv4.skel.h-deps := xdp_router_ipv4.bpf.o xdp_sample.bpf.o
  362. LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
  363. BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c))
  364. BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED))
  365. BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS))
  366. $(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL)
  367. @echo " BPF GEN-OBJ " $(@:.skel.h=)
  368. $(Q)$(BPFTOOL) gen object $(@:.skel.h=.lbpf.o) $(addprefix $(obj)/,$($(@F)-deps))
  369. @echo " BPF GEN-SKEL" $(@:.skel.h=)
  370. $(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@
  371. # asm/sysreg.h - inline assembly used by it is incompatible with llvm.
  372. # But, there is no easy way to fix it, so just exclude it since it is
  373. # useless for BPF samples.
  374. # below we use long chain of commands, clang | opt | llvm-dis | llc,
  375. # to generate final object file. 'clang' compiles the source into IR
  376. # with native target, e.g., x64, arm64, etc. 'opt' does bpf CORE IR builtin
  377. # processing (llvm12) and IR optimizations. 'llvm-dis' converts
  378. # 'opt' output to IR, and finally 'llc' generates bpf byte code.
  379. $(obj)/%.o: $(src)/%.c
  380. @echo " CLANG-bpf " $@
  381. $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS) \
  382. -I$(obj) -I$(srctree)/tools/testing/selftests/bpf/ \
  383. -I$(LIBBPF_INCLUDE) \
  384. -D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \
  385. -D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \
  386. -Wno-gnu-variable-sized-type-not-at-end \
  387. -Wno-address-of-packed-member -Wno-tautological-compare \
  388. -Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
  389. -fno-asynchronous-unwind-tables \
  390. -I$(srctree)/samples/bpf/ -include asm_goto_workaround.h \
  391. -O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \
  392. $(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \
  393. $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@
  394. ifeq ($(DWARF2BTF),y)
  395. $(BTF_PAHOLE) -J $@
  396. endif