OSCL-LXR

0001 # SPDX-License-Identifier: GPL-2.0
0002
0003 BPF_SAMPLES_PATH ?= $(abspath $(srctree)/$(src))
0004 TOOLS_PATH := $(BPF_SAMPLES_PATH)/../../tools
0005
0006 pound := \#
0007
0008 # List of programs to build
0009 tprogs-y := test_lru_dist
0010 tprogs-y += sock_example
0011 tprogs-y += fds_example
0012 tprogs-y += sockex1
0013 tprogs-y += sockex2
0014 tprogs-y += sockex3
0015 tprogs-y += tracex1
0016 tprogs-y += tracex2
0017 tprogs-y += tracex3
0018 tprogs-y += tracex4
0019 tprogs-y += tracex5
0020 tprogs-y += tracex6
0021 tprogs-y += tracex7
0022 tprogs-y += test_probe_write_user
0023 tprogs-y += trace_output
0024 tprogs-y += lathist
0025 tprogs-y += offwaketime
0026 tprogs-y += spintest
0027 tprogs-y += map_perf_test
0028 tprogs-y += test_overhead
0029 tprogs-y += test_cgrp2_array_pin
0030 tprogs-y += test_cgrp2_attach
0031 tprogs-y += test_cgrp2_sock
0032 tprogs-y += test_cgrp2_sock2
0033 tprogs-y += xdp1
0034 tprogs-y += xdp2
0035 tprogs-y += xdp_router_ipv4
0036 tprogs-y += test_current_task_under_cgroup
0037 tprogs-y += trace_event
0038 tprogs-y += sampleip
0039 tprogs-y += tc_l2_redirect
0040 tprogs-y += lwt_len_hist
0041 tprogs-y += xdp_tx_iptunnel
0042 tprogs-y += test_map_in_map
0043 tprogs-y += per_socket_stats_example
0044 tprogs-y += xdp_rxq_info
0045 tprogs-y += syscall_tp
0046 tprogs-y += cpustat
0047 tprogs-y += xdp_adjust_tail
0048 tprogs-y += xdp_fwd
0049 tprogs-y += task_fd_query
0050 tprogs-y += xdp_sample_pkts
0051 tprogs-y += ibumad
0052 tprogs-y += hbm
0053
0054 tprogs-y += xdp_redirect_cpu
0055 tprogs-y += xdp_redirect_map_multi
0056 tprogs-y += xdp_redirect_map
0057 tprogs-y += xdp_redirect
0058 tprogs-y += xdp_monitor
0059
0060 # Libbpf dependencies
0061 LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf
0062 LIBBPF_OUTPUT = $(abspath $(BPF_SAMPLES_PATH))/libbpf
0063 LIBBPF_DESTDIR = $(LIBBPF_OUTPUT)
0064 LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include
0065 LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a
0066
0067 CGROUP_HELPERS := ../../tools/testing/selftests/bpf/cgroup_helpers.o
0068 TRACE_HELPERS := ../../tools/testing/selftests/bpf/trace_helpers.o
0069 XDP_SAMPLE := xdp_sample_user.o
0070
0071 fds_example-objs := fds_example.o
0072 sockex1-objs := sockex1_user.o
0073 sockex2-objs := sockex2_user.o
0074 sockex3-objs := sockex3_user.o
0075 tracex1-objs := tracex1_user.o $(TRACE_HELPERS)
0076 tracex2-objs := tracex2_user.o
0077 tracex3-objs := tracex3_user.o
0078 tracex4-objs := tracex4_user.o
0079 tracex5-objs := tracex5_user.o $(TRACE_HELPERS)
0080 tracex6-objs := tracex6_user.o
0081 tracex7-objs := tracex7_user.o
0082 test_probe_write_user-objs := test_probe_write_user_user.o
0083 trace_output-objs := trace_output_user.o
0084 lathist-objs := lathist_user.o
0085 offwaketime-objs := offwaketime_user.o $(TRACE_HELPERS)
0086 spintest-objs := spintest_user.o $(TRACE_HELPERS)
0087 map_perf_test-objs := map_perf_test_user.o
0088 test_overhead-objs := test_overhead_user.o
0089 test_cgrp2_array_pin-objs := test_cgrp2_array_pin.o
0090 test_cgrp2_attach-objs := test_cgrp2_attach.o
0091 test_cgrp2_sock-objs := test_cgrp2_sock.o
0092 test_cgrp2_sock2-objs := test_cgrp2_sock2.o
0093 xdp1-objs := xdp1_user.o
0094 # reuse xdp1 source intentionally
0095 xdp2-objs := xdp1_user.o
0096 test_current_task_under_cgroup-objs := $(CGROUP_HELPERS) \
0097                                        test_current_task_under_cgroup_user.o
0098 trace_event-objs := trace_event_user.o $(TRACE_HELPERS)
0099 sampleip-objs := sampleip_user.o $(TRACE_HELPERS)
0100 tc_l2_redirect-objs := tc_l2_redirect_user.o
0101 lwt_len_hist-objs := lwt_len_hist_user.o
0102 xdp_tx_iptunnel-objs := xdp_tx_iptunnel_user.o
0103 test_map_in_map-objs := test_map_in_map_user.o
0104 per_socket_stats_example-objs := cookie_uid_helper_example.o
0105 xdp_rxq_info-objs := xdp_rxq_info_user.o
0106 syscall_tp-objs := syscall_tp_user.o
0107 cpustat-objs := cpustat_user.o
0108 xdp_adjust_tail-objs := xdp_adjust_tail_user.o
0109 xdp_fwd-objs := xdp_fwd_user.o
0110 task_fd_query-objs := task_fd_query_user.o $(TRACE_HELPERS)
0111 xdp_sample_pkts-objs := xdp_sample_pkts_user.o
0112 ibumad-objs := ibumad_user.o
0113 hbm-objs := hbm.o $(CGROUP_HELPERS)
0114
0115 xdp_redirect_map_multi-objs := xdp_redirect_map_multi_user.o $(XDP_SAMPLE)
0116 xdp_redirect_cpu-objs := xdp_redirect_cpu_user.o $(XDP_SAMPLE)
0117 xdp_redirect_map-objs := xdp_redirect_map_user.o $(XDP_SAMPLE)
0118 xdp_redirect-objs := xdp_redirect_user.o $(XDP_SAMPLE)
0119 xdp_monitor-objs := xdp_monitor_user.o $(XDP_SAMPLE)
0120 xdp_router_ipv4-objs := xdp_router_ipv4_user.o $(XDP_SAMPLE)
0121
0122 # Tell kbuild to always build the programs
0123 always-y := $(tprogs-y)
0124 always-y += sockex1_kern.o
0125 always-y += sockex2_kern.o
0126 always-y += sockex3_kern.o
0127 always-y += tracex1_kern.o
0128 always-y += tracex2_kern.o
0129 always-y += tracex3_kern.o
0130 always-y += tracex4_kern.o
0131 always-y += tracex5_kern.o
0132 always-y += tracex6_kern.o
0133 always-y += tracex7_kern.o
0134 always-y += sock_flags_kern.o
0135 always-y += test_probe_write_user_kern.o
0136 always-y += trace_output_kern.o
0137 always-y += tcbpf1_kern.o
0138 always-y += tc_l2_redirect_kern.o
0139 always-y += lathist_kern.o
0140 always-y += offwaketime_kern.o
0141 always-y += spintest_kern.o
0142 always-y += map_perf_test_kern.o
0143 always-y += test_overhead_tp_kern.o
0144 always-y += test_overhead_raw_tp_kern.o
0145 always-y += test_overhead_kprobe_kern.o
0146 always-y += parse_varlen.o parse_simple.o parse_ldabs.o
0147 always-y += test_cgrp2_tc_kern.o
0148 always-y += xdp1_kern.o
0149 always-y += xdp2_kern.o
0150 always-y += test_current_task_under_cgroup_kern.o
0151 always-y += trace_event_kern.o
0152 always-y += sampleip_kern.o
0153 always-y += lwt_len_hist_kern.o
0154 always-y += xdp_tx_iptunnel_kern.o
0155 always-y += test_map_in_map_kern.o
0156 always-y += tcp_synrto_kern.o
0157 always-y += tcp_rwnd_kern.o
0158 always-y += tcp_bufs_kern.o
0159 always-y += tcp_cong_kern.o
0160 always-y += tcp_iw_kern.o
0161 always-y += tcp_clamp_kern.o
0162 always-y += tcp_basertt_kern.o
0163 always-y += tcp_tos_reflect_kern.o
0164 always-y += tcp_dumpstats_kern.o
0165 always-y += xdp_rxq_info_kern.o
0166 always-y += xdp2skb_meta_kern.o
0167 always-y += syscall_tp_kern.o
0168 always-y += cpustat_kern.o
0169 always-y += xdp_adjust_tail_kern.o
0170 always-y += xdp_fwd_kern.o
0171 always-y += task_fd_query_kern.o
0172 always-y += xdp_sample_pkts_kern.o
0173 always-y += ibumad_kern.o
0174 always-y += hbm_out_kern.o
0175 always-y += hbm_edt_kern.o
0176
0177 ifeq ($(ARCH), arm)
0178 # Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux
0179 # headers when arm instruction set identification is requested.
0180 ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS))
0181 BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR)
0182 TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR)
0183 endif
0184
0185 ifeq ($(ARCH), mips)
0186 TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__
0187 ifdef CONFIG_MACH_LOONGSON64
0188 BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-loongson64
0189 BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-generic
0190 endif
0191 endif
0192
0193 TPROGS_CFLAGS += -Wall -O2
0194 TPROGS_CFLAGS += -Wmissing-prototypes
0195 TPROGS_CFLAGS += -Wstrict-prototypes
0196
0197 TPROGS_CFLAGS += -I$(objtree)/usr/include
0198 TPROGS_CFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
0199 TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE)
0200 TPROGS_CFLAGS += -I$(srctree)/tools/include
0201 TPROGS_CFLAGS += -I$(srctree)/tools/perf
0202 TPROGS_CFLAGS += -DHAVE_ATTR_TEST=0
0203
0204 ifdef SYSROOT
0205 TPROGS_CFLAGS += --sysroot=$(SYSROOT)
0206 TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib
0207 endif
0208
0209 TPROGS_LDLIBS                   += $(LIBBPF) -lelf -lz
0210 TPROGLDLIBS_xdp_monitor         += -lm
0211 TPROGLDLIBS_xdp_redirect        += -lm
0212 TPROGLDLIBS_xdp_redirect_cpu    += -lm
0213 TPROGLDLIBS_xdp_redirect_map    += -lm
0214 TPROGLDLIBS_xdp_redirect_map_multi += -lm
0215 TPROGLDLIBS_xdp_router_ipv4     += -lm -pthread
0216 TPROGLDLIBS_tracex4             += -lrt
0217 TPROGLDLIBS_trace_output        += -lrt
0218 TPROGLDLIBS_map_perf_test       += -lrt
0219 TPROGLDLIBS_test_overhead       += -lrt
0220
0221 # Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
0222 # make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clang
0223 LLC ?= llc
0224 CLANG ?= clang
0225 OPT ?= opt
0226 LLVM_DIS ?= llvm-dis
0227 LLVM_OBJCOPY ?= llvm-objcopy
0228 LLVM_READELF ?= llvm-readelf
0229 BTF_PAHOLE ?= pahole
0230
0231 # Detect that we're cross compiling and use the cross compiler
0232 ifdef CROSS_COMPILE
0233 CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%))
0234 endif
0235
0236 # Don't evaluate probes and warnings if we need to run make recursively
0237 ifneq ($(src),)
0238 HDR_PROBE := $(shell printf "$(pound)include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \
0239         $(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c - \
0240         -o /dev/null 2>/dev/null && echo okay)
0241
0242 ifeq ($(HDR_PROBE),)
0243 $(warning WARNING: Detected possible issues with include path.)
0244 $(warning WARNING: Please install kernel headers locally (make headers_install).)
0245 endif
0246
0247 BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris)
0248 BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF)
0249 BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm')
0250 BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \
0251                           $(CLANG) -target bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \
0252                           $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \
0253                           /bin/rm -f ./llvm_btf_verify.o)
0254
0255 BPF_EXTRA_CFLAGS += -fno-stack-protector
0256 ifneq ($(BTF_LLVM_PROBE),)
0257         BPF_EXTRA_CFLAGS += -g
0258 else
0259 ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),)
0260         BPF_EXTRA_CFLAGS += -g
0261         LLC_FLAGS += -mattr=dwarfris
0262         DWARF2BTF = y
0263 endif
0264 endif
0265 endif
0266
0267 # Trick to allow make to be run from this directory
0268 all:
0269         $(MAKE) -C ../../ M=$(CURDIR) BPF_SAMPLES_PATH=$(CURDIR)
0270
0271 clean:
0272         $(MAKE) -C ../../ M=$(CURDIR) clean
0273         @find $(CURDIR) -type f -name '*~' -delete
0274         @$(RM) -r $(CURDIR)/libbpf $(CURDIR)/bpftool
0275
0276 $(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
0277 # Fix up variables inherited from Kbuild that tools/ build system won't like
0278         $(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \
0279                 LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(BPF_SAMPLES_PATH)/../../ \
0280                 O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \
0281                 $@ install_headers
0282
0283 BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool
0284 BPFTOOL_OUTPUT := $(abspath $(BPF_SAMPLES_PATH))/bpftool
0285 BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
0286 $(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) | $(BPFTOOL_OUTPUT)
0287         $(MAKE) -C $(BPFTOOLDIR) srctree=$(BPF_SAMPLES_PATH)/../../             \
0288                 OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
0289
0290 $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
0291         $(call msg,MKDIR,$@)
0292         $(Q)mkdir -p $@
0293
0294 $(obj)/syscall_nrs.h:   $(obj)/syscall_nrs.s FORCE
0295         $(call filechk,offsets,__SYSCALL_NRS_H__)
0296
0297 targets += syscall_nrs.s
0298 clean-files += syscall_nrs.h
0299
0300 FORCE:
0301
0302
0303 # Verify LLVM compiler tools are available and bpf target is supported by llc
0304 .PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
0305
0306 verify_cmds: $(CLANG) $(LLC)
0307         @for TOOL in $^ ; do \
0308                 if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
0309                         echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
0310                         exit 1; \
0311                 else true; fi; \
0312         done
0313
0314 verify_target_bpf: verify_cmds
0315         @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \
0316                 echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\
0317                 echo "   NOTICE: LLVM version >= 3.7.1 required" ;\
0318                 exit 2; \
0319         else true; fi
0320
0321 $(BPF_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)
0322 $(src)/*.c: verify_target_bpf $(LIBBPF)
0323
0324 libbpf_hdrs: $(LIBBPF)
0325 $(obj)/$(TRACE_HELPERS) $(obj)/$(CGROUP_HELPERS) $(obj)/$(XDP_SAMPLE): | libbpf_hdrs
0326
0327 .PHONY: libbpf_hdrs
0328
0329 $(obj)/xdp_redirect_cpu_user.o: $(obj)/xdp_redirect_cpu.skel.h
0330 $(obj)/xdp_redirect_map_multi_user.o: $(obj)/xdp_redirect_map_multi.skel.h
0331 $(obj)/xdp_redirect_map_user.o: $(obj)/xdp_redirect_map.skel.h
0332 $(obj)/xdp_redirect_user.o: $(obj)/xdp_redirect.skel.h
0333 $(obj)/xdp_monitor_user.o: $(obj)/xdp_monitor.skel.h
0334 $(obj)/xdp_router_ipv4_user.o: $(obj)/xdp_router_ipv4.skel.h
0335
0336 $(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h
0337 $(obj)/hbm_out_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
0338 $(obj)/hbm.o: $(src)/hbm.h
0339 $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
0340
0341 # Override includes for xdp_sample_user.o because $(srctree)/usr/include in
0342 # TPROGS_CFLAGS causes conflicts
0343 XDP_SAMPLE_CFLAGS += -Wall -O2 \
0344                      -I$(src)/../../tools/include \
0345                      -I$(src)/../../tools/include/uapi \
0346                      -I$(LIBBPF_INCLUDE) \
0347                      -I$(src)/../../tools/testing/selftests/bpf
0348
0349 $(obj)/$(XDP_SAMPLE): TPROGS_CFLAGS = $(XDP_SAMPLE_CFLAGS)
0350 $(obj)/$(XDP_SAMPLE): $(src)/xdp_sample_user.h $(src)/xdp_sample_shared.h
0351
0352 -include $(BPF_SAMPLES_PATH)/Makefile.target
0353
0354 VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux))                         \
0355                      $(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \
0356                      $(abspath ./vmlinux)
0357 VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
0358
0359 $(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL)
0360 ifeq ($(VMLINUX_H),)
0361 ifeq ($(VMLINUX_BTF),)
0362         $(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\
0363                 build the kernel or set VMLINUX_BTF or VMLINUX_H variable)
0364 endif
0365         $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
0366 else
0367         $(Q)cp "$(VMLINUX_H)" $@
0368 endif
0369
0370 clean-files += vmlinux.h
0371
0372 # Get Clang's default includes on this system, as opposed to those seen by
0373 # '-target bpf'. This fixes "missing" files on some architectures/distros,
0374 # such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
0375 #
0376 # Use '-idirafter': Don't interfere with include mechanics except where the
0377 # build would have failed anyways.
0378 define get_sys_includes
0379 $(shell $(1) -v -E - </dev/null 2>&1 \
0380         | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
0381 $(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' | sed 's/#define /-D/' | sed 's/ /=/')
0382 endef
0383
0384 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
0385
0386 $(obj)/xdp_redirect_cpu.bpf.o: $(obj)/xdp_sample.bpf.o
0387 $(obj)/xdp_redirect_map_multi.bpf.o: $(obj)/xdp_sample.bpf.o
0388 $(obj)/xdp_redirect_map.bpf.o: $(obj)/xdp_sample.bpf.o
0389 $(obj)/xdp_redirect.bpf.o: $(obj)/xdp_sample.bpf.o
0390 $(obj)/xdp_monitor.bpf.o: $(obj)/xdp_sample.bpf.o
0391 $(obj)/xdp_router_ipv4.bpf.o: $(obj)/xdp_sample.bpf.o
0392
0393 $(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h $(src)/xdp_sample.bpf.h $(src)/xdp_sample_shared.h
0394         @echo "  CLANG-BPF " $@
0395         $(Q)$(CLANG) -g -O2 -target bpf -D__TARGET_ARCH_$(SRCARCH) \
0396                 -Wno-compare-distinct-pointer-types -I$(srctree)/include \
0397                 -I$(srctree)/samples/bpf -I$(srctree)/tools/include \
0398                 -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \
0399                 -c $(filter %.bpf.c,$^) -o $@
0400
0401 LINKED_SKELS := xdp_redirect_cpu.skel.h xdp_redirect_map_multi.skel.h \
0402                 xdp_redirect_map.skel.h xdp_redirect.skel.h xdp_monitor.skel.h \
0403                 xdp_router_ipv4.skel.h
0404 clean-files += $(LINKED_SKELS)
0405
0406 xdp_redirect_cpu.skel.h-deps := xdp_redirect_cpu.bpf.o xdp_sample.bpf.o
0407 xdp_redirect_map_multi.skel.h-deps := xdp_redirect_map_multi.bpf.o xdp_sample.bpf.o
0408 xdp_redirect_map.skel.h-deps := xdp_redirect_map.bpf.o xdp_sample.bpf.o
0409 xdp_redirect.skel.h-deps := xdp_redirect.bpf.o xdp_sample.bpf.o
0410 xdp_monitor.skel.h-deps := xdp_monitor.bpf.o xdp_sample.bpf.o
0411 xdp_router_ipv4.skel.h-deps := xdp_router_ipv4.bpf.o xdp_sample.bpf.o
0412
0413 LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
0414
0415 BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c))
0416 BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED))
0417 BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS))
0418
0419 $(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL)
0420         @echo "  BPF GEN-OBJ " $(@:.skel.h=)
0421         $(Q)$(BPFTOOL) gen object $(@:.skel.h=.lbpf.o) $(addprefix $(obj)/,$($(@F)-deps))
0422         @echo "  BPF GEN-SKEL" $(@:.skel.h=)
0423         $(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@
0424
0425 # asm/sysreg.h - inline assembly used by it is incompatible with llvm.
0426 # But, there is no easy way to fix it, so just exclude it since it is
0427 # useless for BPF samples.
0428 # below we use long chain of commands, clang | opt | llvm-dis | llc,
0429 # to generate final object file. 'clang' compiles the source into IR
0430 # with native target, e.g., x64, arm64, etc. 'opt' does bpf CORE IR builtin
0431 # processing (llvm12) and IR optimizations. 'llvm-dis' converts
0432 # 'opt' output to IR, and finally 'llc' generates bpf byte code.
0433 $(obj)/%.o: $(src)/%.c
0434         @echo "  CLANG-bpf " $@
0435         $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS) \
0436                 -I$(obj) -I$(srctree)/tools/testing/selftests/bpf/ \
0437                 -I$(LIBBPF_INCLUDE) \
0438                 -D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \
0439                 -D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \
0440                 -Wno-gnu-variable-sized-type-not-at-end \
0441                 -Wno-address-of-packed-member -Wno-tautological-compare \
0442                 -Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
0443                 -fno-asynchronous-unwind-tables \
0444                 -I$(srctree)/samples/bpf/ -include asm_goto_workaround.h \
0445                 -O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \
0446                 $(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \
0447                 $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@
0448 ifeq ($(DWARF2BTF),y)
0449         $(BTF_PAHOLE) -J $@
0450 endif