1# SPDX-License-Identifier: GPL-2.0 2 3BPF_SAMPLES_PATH ?= $(abspath $(srctree)/$(src)) 4TOOLS_PATH := $(BPF_SAMPLES_PATH)/../../tools 5 6pound := \# 7 8# List of programs to build 9tprogs-y := test_lru_dist 10tprogs-y += sock_example 11tprogs-y += fds_example 12tprogs-y += sockex1 13tprogs-y += sockex2 14tprogs-y += sockex3 15tprogs-y += tracex1 16tprogs-y += tracex2 17tprogs-y += tracex3 18tprogs-y += tracex4 19tprogs-y += tracex5 20tprogs-y += tracex6 21tprogs-y += tracex7 22tprogs-y += test_probe_write_user 23tprogs-y += trace_output 24tprogs-y += lathist 25tprogs-y += offwaketime 26tprogs-y += spintest 27tprogs-y += map_perf_test 28tprogs-y += test_overhead 29tprogs-y += test_cgrp2_array_pin 30tprogs-y += test_cgrp2_attach 31tprogs-y += test_cgrp2_sock 32tprogs-y += test_cgrp2_sock2 33tprogs-y += xdp1 34tprogs-y += xdp2 35tprogs-y += xdp_router_ipv4 36tprogs-y += test_current_task_under_cgroup 37tprogs-y += trace_event 38tprogs-y += sampleip 39tprogs-y += tc_l2_redirect 40tprogs-y += lwt_len_hist 41tprogs-y += xdp_tx_iptunnel 42tprogs-y += test_map_in_map 43tprogs-y += per_socket_stats_example 44tprogs-y += xdp_rxq_info 45tprogs-y += syscall_tp 46tprogs-y += cpustat 47tprogs-y += xdp_adjust_tail 48tprogs-y += xdpsock 49tprogs-y += xdpsock_ctrl_proc 50tprogs-y += xsk_fwd 51tprogs-y += xdp_fwd 52tprogs-y += task_fd_query 53tprogs-y += xdp_sample_pkts 54tprogs-y += ibumad 55tprogs-y += hbm 56 57tprogs-y += xdp_redirect_cpu 58tprogs-y += xdp_redirect_map_multi 59tprogs-y += xdp_redirect_map 60tprogs-y += xdp_redirect 61tprogs-y += xdp_monitor 62 63# Libbpf dependencies 64LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf 65LIBBPF_OUTPUT = $(abspath $(BPF_SAMPLES_PATH))/libbpf 66LIBBPF_DESTDIR = $(LIBBPF_OUTPUT) 67LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include 68LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a 69 70CGROUP_HELPERS := ../../tools/testing/selftests/bpf/cgroup_helpers.o 71TRACE_HELPERS := ../../tools/testing/selftests/bpf/trace_helpers.o 72XDP_SAMPLE := xdp_sample_user.o 73 74fds_example-objs := fds_example.o 75sockex1-objs := sockex1_user.o 76sockex2-objs := sockex2_user.o 77sockex3-objs := sockex3_user.o 78tracex1-objs := tracex1_user.o $(TRACE_HELPERS) 79tracex2-objs := tracex2_user.o 80tracex3-objs := tracex3_user.o 81tracex4-objs := tracex4_user.o 82tracex5-objs := tracex5_user.o $(TRACE_HELPERS) 83tracex6-objs := tracex6_user.o 84tracex7-objs := tracex7_user.o 85test_probe_write_user-objs := test_probe_write_user_user.o 86trace_output-objs := trace_output_user.o 87lathist-objs := lathist_user.o 88offwaketime-objs := offwaketime_user.o $(TRACE_HELPERS) 89spintest-objs := spintest_user.o $(TRACE_HELPERS) 90map_perf_test-objs := map_perf_test_user.o 91test_overhead-objs := test_overhead_user.o 92test_cgrp2_array_pin-objs := test_cgrp2_array_pin.o 93test_cgrp2_attach-objs := test_cgrp2_attach.o 94test_cgrp2_sock-objs := test_cgrp2_sock.o 95test_cgrp2_sock2-objs := test_cgrp2_sock2.o 96xdp1-objs := xdp1_user.o 97# reuse xdp1 source intentionally 98xdp2-objs := xdp1_user.o 99test_current_task_under_cgroup-objs := $(CGROUP_HELPERS) \ 100 test_current_task_under_cgroup_user.o 101trace_event-objs := trace_event_user.o $(TRACE_HELPERS) 102sampleip-objs := sampleip_user.o $(TRACE_HELPERS) 103tc_l2_redirect-objs := tc_l2_redirect_user.o 104lwt_len_hist-objs := lwt_len_hist_user.o 105xdp_tx_iptunnel-objs := xdp_tx_iptunnel_user.o 106test_map_in_map-objs := test_map_in_map_user.o 107per_socket_stats_example-objs := cookie_uid_helper_example.o 108xdp_rxq_info-objs := xdp_rxq_info_user.o 109syscall_tp-objs := syscall_tp_user.o 110cpustat-objs := cpustat_user.o 111xdp_adjust_tail-objs := xdp_adjust_tail_user.o 112xdpsock-objs := xdpsock_user.o 113xdpsock_ctrl_proc-objs := xdpsock_ctrl_proc.o 114xsk_fwd-objs := xsk_fwd.o 115xdp_fwd-objs := xdp_fwd_user.o 116task_fd_query-objs := task_fd_query_user.o $(TRACE_HELPERS) 117xdp_sample_pkts-objs := xdp_sample_pkts_user.o 118ibumad-objs := ibumad_user.o 119hbm-objs := hbm.o $(CGROUP_HELPERS) 120 121xdp_redirect_map_multi-objs := xdp_redirect_map_multi_user.o $(XDP_SAMPLE) 122xdp_redirect_cpu-objs := xdp_redirect_cpu_user.o $(XDP_SAMPLE) 123xdp_redirect_map-objs := xdp_redirect_map_user.o $(XDP_SAMPLE) 124xdp_redirect-objs := xdp_redirect_user.o $(XDP_SAMPLE) 125xdp_monitor-objs := xdp_monitor_user.o $(XDP_SAMPLE) 126xdp_router_ipv4-objs := xdp_router_ipv4_user.o $(XDP_SAMPLE) 127 128# Tell kbuild to always build the programs 129always-y := $(tprogs-y) 130always-y += sockex1_kern.o 131always-y += sockex2_kern.o 132always-y += sockex3_kern.o 133always-y += tracex1_kern.o 134always-y += tracex2_kern.o 135always-y += tracex3_kern.o 136always-y += tracex4_kern.o 137always-y += tracex5_kern.o 138always-y += tracex6_kern.o 139always-y += tracex7_kern.o 140always-y += sock_flags_kern.o 141always-y += test_probe_write_user_kern.o 142always-y += trace_output_kern.o 143always-y += tcbpf1_kern.o 144always-y += tc_l2_redirect_kern.o 145always-y += lathist_kern.o 146always-y += offwaketime_kern.o 147always-y += spintest_kern.o 148always-y += map_perf_test_kern.o 149always-y += test_overhead_tp_kern.o 150always-y += test_overhead_raw_tp_kern.o 151always-y += test_overhead_kprobe_kern.o 152always-y += parse_varlen.o parse_simple.o parse_ldabs.o 153always-y += test_cgrp2_tc_kern.o 154always-y += xdp1_kern.o 155always-y += xdp2_kern.o 156always-y += test_current_task_under_cgroup_kern.o 157always-y += trace_event_kern.o 158always-y += sampleip_kern.o 159always-y += lwt_len_hist_kern.o 160always-y += xdp_tx_iptunnel_kern.o 161always-y += test_map_in_map_kern.o 162always-y += tcp_synrto_kern.o 163always-y += tcp_rwnd_kern.o 164always-y += tcp_bufs_kern.o 165always-y += tcp_cong_kern.o 166always-y += tcp_iw_kern.o 167always-y += tcp_clamp_kern.o 168always-y += tcp_basertt_kern.o 169always-y += tcp_tos_reflect_kern.o 170always-y += tcp_dumpstats_kern.o 171always-y += xdp_rxq_info_kern.o 172always-y += xdp2skb_meta_kern.o 173always-y += syscall_tp_kern.o 174always-y += cpustat_kern.o 175always-y += xdp_adjust_tail_kern.o 176always-y += xdp_fwd_kern.o 177always-y += task_fd_query_kern.o 178always-y += xdp_sample_pkts_kern.o 179always-y += ibumad_kern.o 180always-y += hbm_out_kern.o 181always-y += hbm_edt_kern.o 182always-y += xdpsock_kern.o 183 184ifeq ($(ARCH), arm) 185# Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux 186# headers when arm instruction set identification is requested. 187ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS)) 188BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR) 189TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR) 190endif 191 192ifeq ($(ARCH), mips) 193TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__ 194ifdef CONFIG_MACH_LOONGSON64 195BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-loongson64 196BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-generic 197endif 198endif 199 200TPROGS_CFLAGS += -Wall -O2 201TPROGS_CFLAGS += -Wmissing-prototypes 202TPROGS_CFLAGS += -Wstrict-prototypes 203 204TPROGS_CFLAGS += -I$(objtree)/usr/include 205TPROGS_CFLAGS += -I$(srctree)/tools/testing/selftests/bpf/ 206TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE) 207TPROGS_CFLAGS += -I$(srctree)/tools/include 208TPROGS_CFLAGS += -I$(srctree)/tools/perf 209TPROGS_CFLAGS += -DHAVE_ATTR_TEST=0 210 211ifdef SYSROOT 212TPROGS_CFLAGS += --sysroot=$(SYSROOT) 213TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib 214endif 215 216TPROGS_LDLIBS += $(LIBBPF) -lelf -lz 217TPROGLDLIBS_xdp_monitor += -lm 218TPROGLDLIBS_xdp_redirect += -lm 219TPROGLDLIBS_xdp_redirect_cpu += -lm 220TPROGLDLIBS_xdp_redirect_map += -lm 221TPROGLDLIBS_xdp_redirect_map_multi += -lm 222TPROGLDLIBS_xdp_router_ipv4 += -lm -pthread 223TPROGLDLIBS_tracex4 += -lrt 224TPROGLDLIBS_trace_output += -lrt 225TPROGLDLIBS_map_perf_test += -lrt 226TPROGLDLIBS_test_overhead += -lrt 227TPROGLDLIBS_xdpsock += -pthread -lcap 228TPROGLDLIBS_xsk_fwd += -pthread 229 230# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline: 231# make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clang 232LLC ?= llc 233CLANG ?= clang 234OPT ?= opt 235LLVM_DIS ?= llvm-dis 236LLVM_OBJCOPY ?= llvm-objcopy 237LLVM_READELF ?= llvm-readelf 238BTF_PAHOLE ?= pahole 239 240# Detect that we're cross compiling and use the cross compiler 241ifdef CROSS_COMPILE 242CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%)) 243endif 244 245# Don't evaluate probes and warnings if we need to run make recursively 246ifneq ($(src),) 247HDR_PROBE := $(shell printf "$(pound)include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \ 248 $(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c - \ 249 -o /dev/null 2>/dev/null && echo okay) 250 251ifeq ($(HDR_PROBE),) 252$(warning WARNING: Detected possible issues with include path.) 253$(warning WARNING: Please install kernel headers locally (make headers_install).) 254endif 255 256BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris) 257BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF) 258BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm') 259BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \ 260 $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \ 261 $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \ 262 /bin/rm -f ./llvm_btf_verify.o) 263 264BPF_EXTRA_CFLAGS += -fno-stack-protector 265ifneq ($(BTF_LLVM_PROBE),) 266 BPF_EXTRA_CFLAGS += -g 267else 268ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),) 269 BPF_EXTRA_CFLAGS += -g 270 LLC_FLAGS += -mattr=dwarfris 271 DWARF2BTF = y 272endif 273endif 274endif 275 276# Trick to allow make to be run from this directory 277all: 278 $(MAKE) -C ../../ M=$(CURDIR) BPF_SAMPLES_PATH=$(CURDIR) 279 280clean: 281 $(MAKE) -C ../../ M=$(CURDIR) clean 282 @find $(CURDIR) -type f -name '*~' -delete 283 @$(RM) -r $(CURDIR)/libbpf $(CURDIR)/bpftool 284 285$(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT) 286# Fix up variables inherited from Kbuild that tools/ build system won't like 287 $(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \ 288 LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(BPF_SAMPLES_PATH)/../../ \ 289 O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \ 290 $@ install_headers 291 292BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool 293BPFTOOL_OUTPUT := $(abspath $(BPF_SAMPLES_PATH))/bpftool 294BPFTOOL := $(BPFTOOL_OUTPUT)/bpftool 295$(BPFTOOL): $(LIBBPF) $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) | $(BPFTOOL_OUTPUT) 296 $(MAKE) -C $(BPFTOOLDIR) srctree=$(BPF_SAMPLES_PATH)/../../ \ 297 OUTPUT=$(BPFTOOL_OUTPUT)/ \ 298 LIBBPF_OUTPUT=$(LIBBPF_OUTPUT)/ \ 299 LIBBPF_DESTDIR=$(LIBBPF_DESTDIR)/ 300 301$(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT): 302 $(call msg,MKDIR,$@) 303 $(Q)mkdir -p $@ 304 305$(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE 306 $(call filechk,offsets,__SYSCALL_NRS_H__) 307 308targets += syscall_nrs.s 309clean-files += syscall_nrs.h 310 311FORCE: 312 313 314# Verify LLVM compiler tools are available and bpf target is supported by llc 315.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC) 316 317verify_cmds: $(CLANG) $(LLC) 318 @for TOOL in $^ ; do \ 319 if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \ 320 echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\ 321 exit 1; \ 322 else true; fi; \ 323 done 324 325verify_target_bpf: verify_cmds 326 @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \ 327 echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\ 328 echo " NOTICE: LLVM version >= 3.7.1 required" ;\ 329 exit 2; \ 330 else true; fi 331 332$(BPF_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF) 333$(src)/*.c: verify_target_bpf $(LIBBPF) 334 335libbpf_hdrs: $(LIBBPF) 336$(obj)/$(TRACE_HELPERS) $(obj)/$(CGROUP_HELPERS) $(obj)/$(XDP_SAMPLE): | libbpf_hdrs 337 338.PHONY: libbpf_hdrs 339 340$(obj)/xdp_redirect_cpu_user.o: $(obj)/xdp_redirect_cpu.skel.h 341$(obj)/xdp_redirect_map_multi_user.o: $(obj)/xdp_redirect_map_multi.skel.h 342$(obj)/xdp_redirect_map_user.o: $(obj)/xdp_redirect_map.skel.h 343$(obj)/xdp_redirect_user.o: $(obj)/xdp_redirect.skel.h 344$(obj)/xdp_monitor_user.o: $(obj)/xdp_monitor.skel.h 345$(obj)/xdp_router_ipv4_user.o: $(obj)/xdp_router_ipv4.skel.h 346 347$(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h 348$(obj)/hbm_out_kern.o: $(src)/hbm.h $(src)/hbm_kern.h 349$(obj)/hbm.o: $(src)/hbm.h 350$(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h 351 352# Override includes for xdp_sample_user.o because $(srctree)/usr/include in 353# TPROGS_CFLAGS causes conflicts 354XDP_SAMPLE_CFLAGS += -Wall -O2 \ 355 -I$(src)/../../tools/include \ 356 -I$(src)/../../tools/include/uapi \ 357 -I$(LIBBPF_INCLUDE) \ 358 -I$(src)/../../tools/testing/selftests/bpf 359 360$(obj)/$(XDP_SAMPLE): TPROGS_CFLAGS = $(XDP_SAMPLE_CFLAGS) 361$(obj)/$(XDP_SAMPLE): $(src)/xdp_sample_user.h $(src)/xdp_sample_shared.h 362 363-include $(BPF_SAMPLES_PATH)/Makefile.target 364 365VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux)) \ 366 $(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \ 367 $(abspath ./vmlinux) 368VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) 369 370$(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) 371ifeq ($(VMLINUX_H),) 372ifeq ($(VMLINUX_BTF),) 373 $(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\ 374 build the kernel or set VMLINUX_BTF or VMLINUX_H variable) 375endif 376 $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ 377else 378 $(Q)cp "$(VMLINUX_H)" $@ 379endif 380 381clean-files += vmlinux.h 382 383# Get Clang's default includes on this system, as opposed to those seen by 384# '-target bpf'. This fixes "missing" files on some architectures/distros, 385# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc. 386# 387# Use '-idirafter': Don't interfere with include mechanics except where the 388# build would have failed anyways. 389define get_sys_includes 390$(shell $(1) -v -E - </dev/null 2>&1 \ 391 | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \ 392$(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' | sed 's/#define /-D/' | sed 's/ /=/') 393endef 394 395CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG)) 396 397$(obj)/xdp_redirect_cpu.bpf.o: $(obj)/xdp_sample.bpf.o 398$(obj)/xdp_redirect_map_multi.bpf.o: $(obj)/xdp_sample.bpf.o 399$(obj)/xdp_redirect_map.bpf.o: $(obj)/xdp_sample.bpf.o 400$(obj)/xdp_redirect.bpf.o: $(obj)/xdp_sample.bpf.o 401$(obj)/xdp_monitor.bpf.o: $(obj)/xdp_sample.bpf.o 402$(obj)/xdp_router_ipv4.bpf.o: $(obj)/xdp_sample.bpf.o 403 404$(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h $(src)/xdp_sample.bpf.h $(src)/xdp_sample_shared.h 405 @echo " CLANG-BPF " $@ 406 $(Q)$(CLANG) -g -O2 -target bpf -D__TARGET_ARCH_$(SRCARCH) \ 407 -Wno-compare-distinct-pointer-types -I$(srctree)/include \ 408 -I$(srctree)/samples/bpf -I$(srctree)/tools/include \ 409 -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \ 410 -c $(filter %.bpf.c,$^) -o $@ 411 412LINKED_SKELS := xdp_redirect_cpu.skel.h xdp_redirect_map_multi.skel.h \ 413 xdp_redirect_map.skel.h xdp_redirect.skel.h xdp_monitor.skel.h \ 414 xdp_router_ipv4.skel.h 415clean-files += $(LINKED_SKELS) 416 417xdp_redirect_cpu.skel.h-deps := xdp_redirect_cpu.bpf.o xdp_sample.bpf.o 418xdp_redirect_map_multi.skel.h-deps := xdp_redirect_map_multi.bpf.o xdp_sample.bpf.o 419xdp_redirect_map.skel.h-deps := xdp_redirect_map.bpf.o xdp_sample.bpf.o 420xdp_redirect.skel.h-deps := xdp_redirect.bpf.o xdp_sample.bpf.o 421xdp_monitor.skel.h-deps := xdp_monitor.bpf.o xdp_sample.bpf.o 422xdp_router_ipv4.skel.h-deps := xdp_router_ipv4.bpf.o xdp_sample.bpf.o 423 424LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps))) 425 426BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c)) 427BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED)) 428BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS)) 429 430$(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL) 431 @echo " BPF GEN-OBJ " $(@:.skel.h=) 432 $(Q)$(BPFTOOL) gen object $(@:.skel.h=.lbpf.o) $(addprefix $(obj)/,$($(@F)-deps)) 433 @echo " BPF GEN-SKEL" $(@:.skel.h=) 434 $(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@ 435 436# asm/sysreg.h - inline assembly used by it is incompatible with llvm. 437# But, there is no easy way to fix it, so just exclude it since it is 438# useless for BPF samples. 439# below we use long chain of commands, clang | opt | llvm-dis | llc, 440# to generate final object file. 'clang' compiles the source into IR 441# with native target, e.g., x64, arm64, etc. 'opt' does bpf CORE IR builtin 442# processing (llvm12) and IR optimizations. 'llvm-dis' converts 443# 'opt' output to IR, and finally 'llc' generates bpf byte code. 444$(obj)/%.o: $(src)/%.c 445 @echo " CLANG-bpf " $@ 446 $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS) \ 447 -I$(obj) -I$(srctree)/tools/testing/selftests/bpf/ \ 448 -I$(LIBBPF_INCLUDE) \ 449 -D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \ 450 -D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \ 451 -Wno-gnu-variable-sized-type-not-at-end \ 452 -Wno-address-of-packed-member -Wno-tautological-compare \ 453 -Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \ 454 -fno-asynchronous-unwind-tables \ 455 -I$(srctree)/samples/bpf/ -include asm_goto_workaround.h \ 456 -O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \ 457 $(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \ 458 $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@ 459ifeq ($(DWARF2BTF),y) 460 $(BTF_PAHOLE) -J $@ 461endif 462