1# SPDX-License-Identifier: GPL-2.0 2 3# based on tools/testing/selftest/bpf/Makefile 4include ../../../build/Build.include 5include ../../../scripts/Makefile.arch 6include ../../../scripts/Makefile.include 7 8CXX ?= $(CROSS_COMPILE)g++ 9 10HOSTPKG_CONFIG := pkg-config 11 12CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES) -I$(OUTPUT) 13LDLIBS += -lelf -lz -lrt -lpthread 14 15# Silence some warnings when compiled with clang 16ifneq ($(LLVM),) 17CFLAGS += -Wno-unused-command-line-argument 18endif 19 20# Order correspond to 'make run_tests' order 21TEST_GEN_PROGS = hid_bpf 22 23# Emit succinct information message describing current building step 24# $1 - generic step name (e.g., CC, LINK, etc); 25# $2 - optional "flavor" specifier; if provided, will be emitted as [flavor]; 26# $3 - target (assumed to be file); only file name will be emitted; 27# $4 - optional extra arg, emitted as-is, if provided. 28ifeq ($(V),1) 29Q = 30msg = 31else 32Q = @ 33msg = @printf ' %-8s%s %s%s\n' "$(1)" "$(if $(2), [$(2)])" "$(notdir $(3))" "$(if $(4), $(4))"; 34MAKEFLAGS += --no-print-directory 35submake_extras := feature_display=0 36endif 37 38# override lib.mk's default rules 39OVERRIDE_TARGETS := 1 40override define CLEAN 41 $(call msg,CLEAN) 42 $(Q)$(RM) -r $(TEST_GEN_PROGS) 43 $(Q)$(RM) -r $(EXTRA_CLEAN) 44endef 45 46include ../lib.mk 47 48TOOLSDIR := $(top_srcdir)/tools 49LIBDIR := $(TOOLSDIR)/lib 50BPFDIR := $(LIBDIR)/bpf 51TOOLSINCDIR := $(TOOLSDIR)/include 52BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool 53SCRATCH_DIR := $(OUTPUT)/tools 54BUILD_DIR := $(SCRATCH_DIR)/build 55INCLUDE_DIR := $(SCRATCH_DIR)/include 56KHDR_INCLUDES := $(SCRATCH_DIR)/uapi/include 57BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a 58ifneq ($(CROSS_COMPILE),) 59HOST_BUILD_DIR := $(BUILD_DIR)/host 60HOST_SCRATCH_DIR := $(OUTPUT)/host-tools 61HOST_INCLUDE_DIR := $(HOST_SCRATCH_DIR)/include 62else 63HOST_BUILD_DIR := $(BUILD_DIR) 64HOST_SCRATCH_DIR := $(SCRATCH_DIR) 65HOST_INCLUDE_DIR := $(INCLUDE_DIR) 66endif 67HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a 68RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids 69 70VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \ 71 $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \ 72 ../../../../vmlinux \ 73 /sys/kernel/btf/vmlinux \ 74 /boot/vmlinux-$(shell uname -r) 75VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) 76ifeq ($(VMLINUX_BTF),) 77$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)") 78endif 79 80# Define simple and short `make test_progs`, `make test_sysctl`, etc targets 81# to build individual tests. 82# NOTE: Semicolon at the end is critical to override lib.mk's default static 83# rule for binaries. 84$(notdir $(TEST_GEN_PROGS)): %: $(OUTPUT)/% ; 85 86# sort removes libbpf duplicates when not cross-building 87MAKE_DIRS := $(sort $(BUILD_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf \ 88 $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids \ 89 $(INCLUDE_DIR)) 90$(MAKE_DIRS): 91 $(call msg,MKDIR,,$@) 92 $(Q)mkdir -p $@ 93 94$(OUTPUT)/%.o: %.c 95 $(call msg,CC,,$@) 96 $(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@ 97 98# LLVM's ld.lld doesn't support all the architectures, so use it only on x86 99ifeq ($(SRCARCH),x86) 100LLD := lld 101else 102LLD := ld 103endif 104 105DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool 106 107TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL) 108 109$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(BPFOBJ) 110 111BPFTOOL ?= $(DEFAULT_BPFTOOL) 112$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \ 113 $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool 114 $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \ 115 ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) \ 116 EXTRA_CFLAGS='-g -O0' \ 117 OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \ 118 LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/ \ 119 LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/ \ 120 prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin 121 122$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \ 123 | $(BUILD_DIR)/libbpf 124 $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \ 125 EXTRA_CFLAGS='-g -O0' \ 126 DESTDIR=$(SCRATCH_DIR) prefix= all install_headers 127 128ifneq ($(BPFOBJ),$(HOST_BPFOBJ)) 129$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \ 130 | $(HOST_BUILD_DIR)/libbpf 131 $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) \ 132 EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE= \ 133 OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \ 134 DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers 135endif 136 137$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR) 138ifeq ($(VMLINUX_H),) 139 $(call msg,GEN,,$@) 140 $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ 141else 142 $(call msg,CP,,$@) 143 $(Q)cp "$(VMLINUX_H)" $@ 144endif 145 146$(KHDR_INCLUDES)/linux/hid.h: $(top_srcdir)/include/uapi/linux/hid.h 147 $(MAKE) -C $(top_srcdir) INSTALL_HDR_PATH=$(SCRATCH_DIR)/uapi headers_install 148 149$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids \ 150 $(TOOLSDIR)/bpf/resolve_btfids/main.c \ 151 $(TOOLSDIR)/lib/rbtree.c \ 152 $(TOOLSDIR)/lib/zalloc.c \ 153 $(TOOLSDIR)/lib/string.c \ 154 $(TOOLSDIR)/lib/ctype.c \ 155 $(TOOLSDIR)/lib/str_error_r.c 156 $(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids \ 157 CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \ 158 LIBBPF_INCLUDE=$(HOST_INCLUDE_DIR) \ 159 OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ) 160 161# Get Clang's default includes on this system, as opposed to those seen by 162# '-target bpf'. This fixes "missing" files on some architectures/distros, 163# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc. 164# 165# Use '-idirafter': Don't interfere with include mechanics except where the 166# build would have failed anyways. 167define get_sys_includes 168$(shell $(1) -v -E - </dev/null 2>&1 \ 169 | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \ 170$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}') 171endef 172 173# Determine target endianness. 174IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \ 175 grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__') 176MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian) 177 178CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG)) 179BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) \ 180 -I$(INCLUDE_DIR) 181 182CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \ 183 -Wno-compare-distinct-pointer-types 184 185# Build BPF object using Clang 186# $1 - input .c file 187# $2 - output .o file 188# $3 - CFLAGS 189define CLANG_BPF_BUILD_RULE 190 $(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2) 191 $(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2 192endef 193# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32 194define CLANG_NOALU32_BPF_BUILD_RULE 195 $(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2) 196 $(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2 197endef 198# Build BPF object using GCC 199define GCC_BPF_BUILD_RULE 200 $(call msg,GCC-BPF,$(TRUNNER_BINARY),$2) 201 $(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2 202endef 203 204BPF_PROGS_DIR := progs 205BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE 206BPF_SRCS := $(notdir $(wildcard $(BPF_PROGS_DIR)/*.c)) 207BPF_OBJS := $(patsubst %.c,$(OUTPUT)/%.bpf.o, $(BPF_SRCS)) 208BPF_SKELS := $(patsubst %.c,$(OUTPUT)/%.skel.h, $(BPF_SRCS)) 209TEST_GEN_FILES += $(BPF_OBJS) 210 211$(BPF_PROGS_DIR)-bpfobjs := y 212$(BPF_OBJS): $(OUTPUT)/%.bpf.o: \ 213 $(BPF_PROGS_DIR)/%.c \ 214 $(wildcard $(BPF_PROGS_DIR)/*.h) \ 215 $(INCLUDE_DIR)/vmlinux.h \ 216 $(wildcard $(BPFDIR)/hid_bpf_*.h) \ 217 $(wildcard $(BPFDIR)/*.bpf.h) \ 218 | $(OUTPUT) $(BPFOBJ) 219 $(call $(BPF_BUILD_RULE),$<,$@, $(BPF_CFLAGS)) 220 221$(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT) 222 $(call msg,GEN-SKEL,$(BINARY),$@) 223 $(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $< 224 $(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@ 225 226$(OUTPUT)/%:%.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h 227 $(call msg,BINARY,,$@) 228 $(Q)$(LINK.c) $^ $(LDLIBS) -o $@ 229 230EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) feature bpftool \ 231 $(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32) 232