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
8TEST_PROGS := hid-core.sh
9TEST_PROGS += hid-gamepad.sh
10
11CXX ?= $(CROSS_COMPILE)g++
12
13HOSTPKG_CONFIG := pkg-config
14
15CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES) -I$(OUTPUT)
16LDLIBS += -lelf -lz -lrt -lpthread
17
18# Silence some warnings when compiled with clang
19ifneq ($(LLVM),)
20CFLAGS += -Wno-unused-command-line-argument
21endif
22
23# Order correspond to 'make run_tests' order
24TEST_GEN_PROGS = hid_bpf
25
26# Emit succinct information message describing current building step
27# $1 - generic step name (e.g., CC, LINK, etc);
28# $2 - optional "flavor" specifier; if provided, will be emitted as [flavor];
29# $3 - target (assumed to be file); only file name will be emitted;
30# $4 - optional extra arg, emitted as-is, if provided.
31ifeq ($(V),1)
32Q =
33msg =
34else
35Q = @
36msg = @printf '  %-8s%s %s%s\n' "$(1)" "$(if $(2), [$(2)])" "$(notdir $(3))" "$(if $(4), $(4))";
37MAKEFLAGS += --no-print-directory
38submake_extras := feature_display=0
39endif
40
41# override lib.mk's default rules
42OVERRIDE_TARGETS := 1
43override define CLEAN
44	$(call msg,CLEAN)
45	$(Q)$(RM) -r $(TEST_GEN_PROGS)
46	$(Q)$(RM) -r $(EXTRA_CLEAN)
47endef
48
49include ../lib.mk
50
51TOOLSDIR := $(top_srcdir)/tools
52LIBDIR := $(TOOLSDIR)/lib
53BPFDIR := $(LIBDIR)/bpf
54TOOLSINCDIR := $(TOOLSDIR)/include
55BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
56SCRATCH_DIR := $(OUTPUT)/tools
57BUILD_DIR := $(SCRATCH_DIR)/build
58INCLUDE_DIR := $(SCRATCH_DIR)/include
59KHDR_INCLUDES := $(SCRATCH_DIR)/uapi/include
60BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
61ifneq ($(CROSS_COMPILE),)
62HOST_BUILD_DIR		:= $(BUILD_DIR)/host
63HOST_SCRATCH_DIR	:= $(OUTPUT)/host-tools
64HOST_INCLUDE_DIR	:= $(HOST_SCRATCH_DIR)/include
65else
66HOST_BUILD_DIR		:= $(BUILD_DIR)
67HOST_SCRATCH_DIR	:= $(SCRATCH_DIR)
68HOST_INCLUDE_DIR	:= $(INCLUDE_DIR)
69endif
70HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a
71RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids
72
73VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux)				\
74		     $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)	\
75		     ../../../../vmlinux				\
76		     /sys/kernel/btf/vmlinux				\
77		     /boot/vmlinux-$(shell uname -r)
78VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
79ifeq ($(VMLINUX_BTF),)
80$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
81endif
82
83# Define simple and short `make test_progs`, `make test_sysctl`, etc targets
84# to build individual tests.
85# NOTE: Semicolon at the end is critical to override lib.mk's default static
86# rule for binaries.
87$(notdir $(TEST_GEN_PROGS)): %: $(OUTPUT)/% ;
88
89# sort removes libbpf duplicates when not cross-building
90MAKE_DIRS := $(sort $(BUILD_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf		\
91	       $(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids	\
92	       $(INCLUDE_DIR))
93$(MAKE_DIRS):
94	$(call msg,MKDIR,,$@)
95	$(Q)mkdir -p $@
96
97# LLVM's ld.lld doesn't support all the architectures, so use it only on x86
98ifeq ($(SRCARCH),x86)
99LLD := lld
100else
101LLD := ld
102endif
103
104DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool
105
106TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL)
107
108$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(BPFOBJ)
109
110BPFTOOL ?= $(DEFAULT_BPFTOOL)
111$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)    \
112		    $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool
113	$(Q)$(MAKE) $(submake_extras)  -C $(BPFTOOLDIR)			       \
114		    ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) 	       \
115		    EXTRA_CFLAGS='-g -O0'				       \
116		    OUTPUT=$(HOST_BUILD_DIR)/bpftool/			       \
117		    LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/		       \
118		    LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/			       \
119		    prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
120
121$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
122	   | $(BUILD_DIR)/libbpf
123	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
124		    EXTRA_CFLAGS='-g -O0'				       \
125		    DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
126
127ifneq ($(BPFOBJ),$(HOST_BPFOBJ))
128$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
129		| $(HOST_BUILD_DIR)/libbpf
130	$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR)                             \
131		    EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE=		       \
132		    OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \
133		    DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers
134endif
135
136$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
137ifeq ($(VMLINUX_H),)
138	$(call msg,GEN,,$@)
139	$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
140else
141	$(call msg,CP,,$@)
142	$(Q)cp "$(VMLINUX_H)" $@
143endif
144
145$(KHDR_INCLUDES)/linux/hid.h: $(top_srcdir)/include/uapi/linux/hid.h
146	$(MAKE) -C $(top_srcdir) INSTALL_HDR_PATH=$(SCRATCH_DIR)/uapi headers_install
147
148$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids	\
149		       $(TOOLSDIR)/bpf/resolve_btfids/main.c	\
150		       $(TOOLSDIR)/lib/rbtree.c			\
151		       $(TOOLSDIR)/lib/zalloc.c			\
152		       $(TOOLSDIR)/lib/string.c			\
153		       $(TOOLSDIR)/lib/ctype.c			\
154		       $(TOOLSDIR)/lib/str_error_r.c
155	$(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids	\
156		CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \
157		LIBBPF_INCLUDE=$(HOST_INCLUDE_DIR) \
158		OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)
159
160# Get Clang's default includes on this system, as opposed to those seen by
161# '-target bpf'. This fixes "missing" files on some architectures/distros,
162# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
163#
164# Use '-idirafter': Don't interfere with include mechanics except where the
165# build would have failed anyways.
166define get_sys_includes
167$(shell $(1) -v -E - </dev/null 2>&1 \
168	| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
169$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
170endef
171
172# Determine target endianness.
173IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
174			grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
175MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
176
177CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
178BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 		\
179	     -I$(INCLUDE_DIR)
180
181CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
182	       -Wno-compare-distinct-pointer-types
183
184# Build BPF object using Clang
185# $1 - input .c file
186# $2 - output .o file
187# $3 - CFLAGS
188define CLANG_BPF_BUILD_RULE
189	$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
190	$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2
191endef
192# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
193define CLANG_NOALU32_BPF_BUILD_RULE
194	$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
195	$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2
196endef
197# Build BPF object using GCC
198define GCC_BPF_BUILD_RULE
199	$(call msg,GCC-BPF,$(TRUNNER_BINARY),$2)
200	$(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2
201endef
202
203BPF_PROGS_DIR := progs
204BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
205BPF_SRCS := $(notdir $(wildcard $(BPF_PROGS_DIR)/*.c))
206BPF_OBJS := $(patsubst %.c,$(OUTPUT)/%.bpf.o, $(BPF_SRCS))
207BPF_SKELS := $(patsubst %.c,$(OUTPUT)/%.skel.h, $(BPF_SRCS))
208TEST_GEN_FILES += $(BPF_OBJS)
209
210$(BPF_PROGS_DIR)-bpfobjs := y
211$(BPF_OBJS): $(OUTPUT)/%.bpf.o:				\
212	     $(BPF_PROGS_DIR)/%.c			\
213	     $(wildcard $(BPF_PROGS_DIR)/*.h)		\
214	     $(INCLUDE_DIR)/vmlinux.h				\
215	     $(wildcard $(BPFDIR)/hid_bpf_*.h)			\
216	     $(wildcard $(BPFDIR)/*.bpf.h)			\
217	     | $(OUTPUT) $(BPFOBJ)
218	$(call $(BPF_BUILD_RULE),$<,$@, $(BPF_CFLAGS))
219
220$(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
221	$(call msg,GEN-SKEL,$(BINARY),$@)
222	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
223	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
224
225$(OUTPUT)/%.o: %.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
226	$(call msg,CC,,$@)
227	$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
228
229$(OUTPUT)/%: $(OUTPUT)/%.o
230	$(call msg,BINARY,,$@)
231	$(Q)$(LINK.c) $^ $(LDLIBS) -o $@
232
233EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) feature bpftool	\
234	$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32)
235