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6008105b BT |
1 | # SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | HID_SAMPLES_PATH ?= $(abspath $(srctree)/$(src)) | |
4 | TOOLS_PATH := $(HID_SAMPLES_PATH)/../../tools | |
5 | ||
6 | pound := \# | |
7 | ||
8 | # List of programs to build | |
9 | tprogs-y += hid_mouse | |
a56a2569 | 10 | tprogs-y += hid_surface_dial |
6008105b BT |
11 | |
12 | # Libbpf dependencies | |
13 | LIBBPF_SRC = $(TOOLS_PATH)/lib/bpf | |
14 | LIBBPF_OUTPUT = $(abspath $(HID_SAMPLES_PATH))/libbpf | |
15 | LIBBPF_DESTDIR = $(LIBBPF_OUTPUT) | |
16 | LIBBPF_INCLUDE = $(LIBBPF_DESTDIR)/include | |
17 | LIBBPF = $(LIBBPF_OUTPUT)/libbpf.a | |
18 | ||
19 | EXTRA_HEADERS := hid_bpf_attach.h | |
20 | EXTRA_BPF_HEADERS := hid_bpf_helpers.h | |
21 | ||
22 | hid_mouse-objs := hid_mouse.o | |
a56a2569 | 23 | hid_surface_dial-objs := hid_surface_dial.o |
6008105b BT |
24 | |
25 | # Tell kbuild to always build the programs | |
26 | always-y := $(tprogs-y) | |
27 | ||
28 | ifeq ($(ARCH), arm) | |
29 | # Strip all except -D__LINUX_ARM_ARCH__ option needed to handle linux | |
30 | # headers when arm instruction set identification is requested. | |
31 | ARM_ARCH_SELECTOR := $(filter -D__LINUX_ARM_ARCH__%, $(KBUILD_CFLAGS)) | |
32 | BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR) | |
33 | TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR) | |
34 | endif | |
35 | ||
36 | ifeq ($(ARCH), mips) | |
37 | TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__ | |
38 | ifdef CONFIG_MACH_LOONGSON64 | |
39 | BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-loongson64 | |
40 | BPF_EXTRA_CFLAGS += -I$(srctree)/arch/mips/include/asm/mach-generic | |
41 | endif | |
42 | endif | |
43 | ||
44 | TPROGS_CFLAGS += -Wall -O2 | |
45 | TPROGS_CFLAGS += -Wmissing-prototypes | |
46 | TPROGS_CFLAGS += -Wstrict-prototypes | |
47 | ||
48 | TPROGS_CFLAGS += -I$(objtree)/usr/include | |
49 | TPROGS_CFLAGS += -I$(LIBBPF_INCLUDE) | |
50 | TPROGS_CFLAGS += -I$(srctree)/tools/include | |
51 | ||
52 | ifdef SYSROOT | |
53 | TPROGS_CFLAGS += --sysroot=$(SYSROOT) | |
54 | TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib | |
55 | endif | |
56 | ||
57 | TPROGS_LDLIBS += $(LIBBPF) -lelf -lz | |
58 | ||
59 | # Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline: | |
60 | # make M=samples/bpf LLC=~/git/llvm-project/llvm/build/bin/llc CLANG=~/git/llvm-project/llvm/build/bin/clang | |
61 | LLC ?= llc | |
62 | CLANG ?= clang | |
63 | OPT ?= opt | |
64 | LLVM_DIS ?= llvm-dis | |
65 | LLVM_OBJCOPY ?= llvm-objcopy | |
66 | LLVM_READELF ?= llvm-readelf | |
67 | BTF_PAHOLE ?= pahole | |
68 | ||
69 | # Detect that we're cross compiling and use the cross compiler | |
70 | ifdef CROSS_COMPILE | |
71 | CLANG_ARCH_ARGS = --target=$(notdir $(CROSS_COMPILE:%-=%)) | |
72 | endif | |
73 | ||
74 | # Don't evaluate probes and warnings if we need to run make recursively | |
75 | ifneq ($(src),) | |
76 | HDR_PROBE := $(shell printf "$(pound)include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \ | |
77 | $(CC) $(TPROGS_CFLAGS) $(TPROGS_LDFLAGS) -x c - \ | |
78 | -o /dev/null 2>/dev/null && echo okay) | |
79 | ||
80 | ifeq ($(HDR_PROBE),) | |
81 | $(warning WARNING: Detected possible issues with include path.) | |
82 | $(warning WARNING: Please install kernel headers locally (make headers_install).) | |
83 | endif | |
84 | ||
85 | BTF_LLC_PROBE := $(shell $(LLC) -march=bpf -mattr=help 2>&1 | grep dwarfris) | |
86 | BTF_PAHOLE_PROBE := $(shell $(BTF_PAHOLE) --help 2>&1 | grep BTF) | |
87 | BTF_OBJCOPY_PROBE := $(shell $(LLVM_OBJCOPY) --help 2>&1 | grep -i 'usage.*llvm') | |
88 | BTF_LLVM_PROBE := $(shell echo "int main() { return 0; }" | \ | |
bbaf1ff0 | 89 | $(CLANG) --target=bpf -O2 -g -c -x c - -o ./llvm_btf_verify.o; \ |
6008105b BT |
90 | $(LLVM_READELF) -S ./llvm_btf_verify.o | grep BTF; \ |
91 | /bin/rm -f ./llvm_btf_verify.o) | |
92 | ||
93 | BPF_EXTRA_CFLAGS += -fno-stack-protector | |
94 | ifneq ($(BTF_LLVM_PROBE),) | |
95 | BPF_EXTRA_CFLAGS += -g | |
96 | else | |
97 | ifneq ($(and $(BTF_LLC_PROBE),$(BTF_PAHOLE_PROBE),$(BTF_OBJCOPY_PROBE)),) | |
98 | BPF_EXTRA_CFLAGS += -g | |
99 | LLC_FLAGS += -mattr=dwarfris | |
100 | DWARF2BTF = y | |
101 | endif | |
102 | endif | |
103 | endif | |
104 | ||
105 | # Trick to allow make to be run from this directory | |
106 | all: | |
107 | $(MAKE) -C ../../ M=$(CURDIR) HID_SAMPLES_PATH=$(CURDIR) | |
108 | ||
109 | clean: | |
110 | $(MAKE) -C ../../ M=$(CURDIR) clean | |
111 | @find $(CURDIR) -type f -name '*~' -delete | |
112 | @$(RM) -r $(CURDIR)/libbpf $(CURDIR)/bpftool | |
113 | ||
114 | $(LIBBPF): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT) | |
115 | # Fix up variables inherited from Kbuild that tools/ build system won't like | |
116 | $(MAKE) -C $(LIBBPF_SRC) RM='rm -rf' EXTRA_CFLAGS="$(TPROGS_CFLAGS)" \ | |
117 | LDFLAGS=$(TPROGS_LDFLAGS) srctree=$(HID_SAMPLES_PATH)/../../ \ | |
118 | O= OUTPUT=$(LIBBPF_OUTPUT)/ DESTDIR=$(LIBBPF_DESTDIR) prefix= \ | |
119 | $@ install_headers | |
120 | ||
121 | BPFTOOLDIR := $(TOOLS_PATH)/bpf/bpftool | |
122 | BPFTOOL_OUTPUT := $(abspath $(HID_SAMPLES_PATH))/bpftool | |
123 | BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool | |
124 | $(BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) | $(BPFTOOL_OUTPUT) | |
125 | $(MAKE) -C $(BPFTOOLDIR) srctree=$(HID_SAMPLES_PATH)/../../ \ | |
126 | OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap | |
127 | ||
128 | $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT): | |
129 | $(call msg,MKDIR,$@) | |
130 | $(Q)mkdir -p $@ | |
131 | ||
132 | FORCE: | |
133 | ||
134 | ||
135 | # Verify LLVM compiler tools are available and bpf target is supported by llc | |
136 | .PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC) | |
137 | ||
138 | verify_cmds: $(CLANG) $(LLC) | |
139 | @for TOOL in $^ ; do \ | |
140 | if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \ | |
141 | echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\ | |
142 | exit 1; \ | |
143 | else true; fi; \ | |
144 | done | |
145 | ||
146 | verify_target_bpf: verify_cmds | |
147 | @if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \ | |
148 | echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\ | |
149 | echo " NOTICE: LLVM version >= 3.7.1 required" ;\ | |
150 | exit 2; \ | |
151 | else true; fi | |
152 | ||
153 | $(HID_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF) | |
154 | $(src)/*.c: verify_target_bpf $(LIBBPF) | |
155 | ||
156 | libbpf_hdrs: $(LIBBPF) | |
157 | ||
158 | .PHONY: libbpf_hdrs | |
159 | ||
160 | $(obj)/hid_mouse.o: $(obj)/hid_mouse.skel.h | |
a56a2569 | 161 | $(obj)/hid_surface_dial.o: $(obj)/hid_surface_dial.skel.h |
6008105b BT |
162 | |
163 | -include $(HID_SAMPLES_PATH)/Makefile.target | |
164 | ||
165 | VMLINUX_BTF_PATHS ?= $(abspath $(if $(O),$(O)/vmlinux)) \ | |
166 | $(abspath $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux)) \ | |
167 | $(abspath ./vmlinux) | |
168 | VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS)))) | |
169 | ||
170 | $(obj)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | |
171 | ifeq ($(VMLINUX_H),) | |
172 | ifeq ($(VMLINUX_BTF),) | |
173 | $(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)",\ | |
174 | build the kernel or set VMLINUX_BTF or VMLINUX_H variable) | |
175 | endif | |
176 | $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@ | |
177 | else | |
178 | $(Q)cp "$(VMLINUX_H)" $@ | |
179 | endif | |
180 | ||
181 | clean-files += vmlinux.h | |
182 | ||
183 | # Get Clang's default includes on this system, as opposed to those seen by | |
bbaf1ff0 | 184 | # '--target=bpf'. This fixes "missing" files on some architectures/distros, |
6008105b BT |
185 | # such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc. |
186 | # | |
187 | # Use '-idirafter': Don't interfere with include mechanics except where the | |
188 | # build would have failed anyways. | |
189 | define get_sys_includes | |
190 | $(shell $(1) -v -E - </dev/null 2>&1 \ | |
191 | | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \ | |
192 | $(shell $(1) -dM -E - </dev/null | grep '#define __riscv_xlen ' | sed 's/#define /-D/' | sed 's/ /=/') | |
193 | endef | |
194 | ||
195 | CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG)) | |
196 | ||
197 | EXTRA_BPF_HEADERS_SRC := $(addprefix $(src)/,$(EXTRA_BPF_HEADERS)) | |
198 | ||
199 | $(obj)/%.bpf.o: $(src)/%.bpf.c $(EXTRA_BPF_HEADERS_SRC) $(obj)/vmlinux.h | |
200 | @echo " CLANG-BPF " $@ | |
bbaf1ff0 | 201 | $(Q)$(CLANG) -g -O2 --target=bpf -D__TARGET_ARCH_$(SRCARCH) \ |
6008105b BT |
202 | -Wno-compare-distinct-pointer-types -I$(srctree)/include \ |
203 | -I$(srctree)/samples/bpf -I$(srctree)/tools/include \ | |
204 | -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \ | |
205 | -c $(filter %.bpf.c,$^) -o $@ | |
206 | ||
a56a2569 | 207 | LINKED_SKELS := hid_mouse.skel.h hid_surface_dial.skel.h |
6008105b BT |
208 | clean-files += $(LINKED_SKELS) |
209 | ||
210 | hid_mouse.skel.h-deps := hid_mouse.bpf.o hid_bpf_attach.bpf.o | |
a56a2569 | 211 | hid_surface_dial.skel.h-deps := hid_surface_dial.bpf.o hid_bpf_attach.bpf.o |
6008105b BT |
212 | |
213 | LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps))) | |
214 | ||
215 | BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c)) | |
216 | BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED)) | |
217 | BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS)) | |
218 | ||
219 | $(BPF_SKELS_LINKED): $(BPF_OBJS_LINKED) $(BPFTOOL) | |
220 | @echo " BPF GEN-OBJ " $(@:.skel.h=) | |
221 | $(Q)$(BPFTOOL) gen object $(@:.skel.h=.lbpf.o) $(addprefix $(obj)/,$($(@F)-deps)) | |
222 | @echo " BPF GEN-SKEL" $(@:.skel.h=) | |
223 | $(Q)$(BPFTOOL) gen skeleton $(@:.skel.h=.lbpf.o) name $(notdir $(@:.skel.h=)) > $@ | |
224 | ||
225 | # asm/sysreg.h - inline assembly used by it is incompatible with llvm. | |
226 | # But, there is no easy way to fix it, so just exclude it since it is | |
227 | # useless for BPF samples. | |
228 | # below we use long chain of commands, clang | opt | llvm-dis | llc, | |
229 | # to generate final object file. 'clang' compiles the source into IR | |
230 | # with native target, e.g., x64, arm64, etc. 'opt' does bpf CORE IR builtin | |
231 | # processing (llvm12) and IR optimizations. 'llvm-dis' converts | |
232 | # 'opt' output to IR, and finally 'llc' generates bpf byte code. | |
233 | $(obj)/%.o: $(src)/%.c | |
234 | @echo " CLANG-bpf " $@ | |
235 | $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(BPF_EXTRA_CFLAGS) \ | |
236 | -I$(obj) -I$(srctree)/tools/testing/selftests/bpf/ \ | |
237 | -I$(LIBBPF_INCLUDE) \ | |
238 | -D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \ | |
239 | -D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \ | |
240 | -Wno-gnu-variable-sized-type-not-at-end \ | |
241 | -Wno-address-of-packed-member -Wno-tautological-compare \ | |
242 | -Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \ | |
243 | -fno-asynchronous-unwind-tables \ | |
244 | -I$(srctree)/samples/hid/ \ | |
245 | -O2 -emit-llvm -Xclang -disable-llvm-passes -c $< -o - | \ | |
246 | $(OPT) -O2 -mtriple=bpf-pc-linux | $(LLVM_DIS) | \ | |
247 | $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@ | |
248 | ifeq ($(DWARF2BTF),y) | |
249 | $(BTF_PAHOLE) -J $@ | |
250 | endif |