Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 $@
93
94# LLVM's ld.lld doesn't support all the architectures, so use it only on x86
95ifeq ($(SRCARCH),x86)
96LLD := lld
97else
98LLD := ld
99endif
100
101DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool
102
103TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL)
104
105$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(BPFOBJ)
106
107BPFTOOL ?= $(DEFAULT_BPFTOOL)
108$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \
109 $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool
110 $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \
111 ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) \
112 EXTRA_CFLAGS='-g -O0' \
113 OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \
114 LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/ \
115 LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/ \
116 prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
117
118$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
119 | $(BUILD_DIR)/libbpf
120 $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
121 EXTRA_CFLAGS='-g -O0' \
122 DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
123
124ifneq ($(BPFOBJ),$(HOST_BPFOBJ))
125$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
126 | $(HOST_BUILD_DIR)/libbpf
127 $(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) \
128 EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE= \
129 OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \
130 DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers
131endif
132
133$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
134ifeq ($(VMLINUX_H),)
135 $(call msg,GEN,,$@)
136 $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
137else
138 $(call msg,CP,,$@)
139 $(Q)cp "$(VMLINUX_H)" $@
140endif
141
142$(KHDR_INCLUDES)/linux/hid.h: $(top_srcdir)/include/uapi/linux/hid.h
143 $(MAKE) -C $(top_srcdir) INSTALL_HDR_PATH=$(SCRATCH_DIR)/uapi headers_install
144
145$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids \
146 $(TOOLSDIR)/bpf/resolve_btfids/main.c \
147 $(TOOLSDIR)/lib/rbtree.c \
148 $(TOOLSDIR)/lib/zalloc.c \
149 $(TOOLSDIR)/lib/string.c \
150 $(TOOLSDIR)/lib/ctype.c \
151 $(TOOLSDIR)/lib/str_error_r.c
152 $(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids \
153 CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \
154 LIBBPF_INCLUDE=$(HOST_INCLUDE_DIR) \
155 OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)
156
157# Get Clang's default includes on this system, as opposed to those seen by
158# '-target bpf'. This fixes "missing" files on some architectures/distros,
159# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
160#
161# Use '-idirafter': Don't interfere with include mechanics except where the
162# build would have failed anyways.
163define get_sys_includes
164$(shell $(1) -v -E - </dev/null 2>&1 \
165 | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
166$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
167endef
168
169# Determine target endianness.
170IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
171 grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
172MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
173
174CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
175BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) \
176 -I$(INCLUDE_DIR)
177
178CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
179 -Wno-compare-distinct-pointer-types
180
181# Build BPF object using Clang
182# $1 - input .c file
183# $2 - output .o file
184# $3 - CFLAGS
185define CLANG_BPF_BUILD_RULE
186 $(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
187 $(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2
188endef
189# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
190define CLANG_NOALU32_BPF_BUILD_RULE
191 $(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
192 $(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2
193endef
194# Build BPF object using GCC
195define GCC_BPF_BUILD_RULE
196 $(call msg,GCC-BPF,$(TRUNNER_BINARY),$2)
197 $(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2
198endef
199
200BPF_PROGS_DIR := progs
201BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
202BPF_SRCS := $(notdir $(wildcard $(BPF_PROGS_DIR)/*.c))
203BPF_OBJS := $(patsubst %.c,$(OUTPUT)/%.bpf.o, $(BPF_SRCS))
204BPF_SKELS := $(patsubst %.c,$(OUTPUT)/%.skel.h, $(BPF_SRCS))
205TEST_GEN_FILES += $(BPF_OBJS)
206
207$(BPF_PROGS_DIR)-bpfobjs := y
208$(BPF_OBJS): $(OUTPUT)/%.bpf.o: \
209 $(BPF_PROGS_DIR)/%.c \
210 $(wildcard $(BPF_PROGS_DIR)/*.h) \
211 $(INCLUDE_DIR)/vmlinux.h \
212 $(wildcard $(BPFDIR)/hid_bpf_*.h) \
213 $(wildcard $(BPFDIR)/*.bpf.h) \
214 | $(OUTPUT) $(BPFOBJ)
215 $(call $(BPF_BUILD_RULE),$<,$@, $(BPF_CFLAGS))
216
217$(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
218 $(call msg,GEN-SKEL,$(BINARY),$@)
219 $(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
220 $(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
221
222$(OUTPUT)/%.o: %.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
223 $(call msg,CC,,$@)
224 $(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
225
226$(OUTPUT)/%: $(OUTPUT)/%.o
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)