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# SPDX-License-Identifier: GPL-2.0
# Shared BPF Skeleton Generator Rules
include $(srctree)/tools/scripts/Makefile.include
# Shared foundational tooling always lives in util/bpf_skel
SKEL_TOOL_OUT := $(abspath $(OUTPUT)util/bpf_skel)
SKEL_TOOL_TMP_OUT := $(abspath $(SKEL_TOOL_OUT)/.tmp)
# Component specific output lives in $(dir)/bpf_skel
SKEL_OUT := $(abspath $(OUTPUT)$(dir)/bpf_skel)
SKEL_TMP_OUT := $(abspath $(SKEL_OUT)/.tmp)
ifeq ($(CONFIG_PERF_BPF_SKEL),y)
BPFTOOL := $(SKEL_TOOL_TMP_OUT)/bootstrap/bpftool
VMLINUX_H := $(SKEL_TOOL_OUT)/vmlinux.h
.PHONY: bpf-skel-prepare
bpf-skel-prepare: $(BPFTOOL) $(VMLINUX_H)
@:
define get_sys_includes
$(shell $(1) $(2) -v -E - </dev/null 2>&1 \
| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
endef
ifneq ($(CROSS_COMPILE),)
CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%))
endif
CLANG_OPTIONS = -Wall -mcpu=v3
CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
LIBBPF_INCLUDE := $(abspath $(or $(OUTPUT),.))/libbpf/include
BPF_INCLUDE := -I$(SKEL_TMP_OUT)/.. -I$(SKEL_TOOL_OUT) -I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES)
TOOLS_UAPI_INCLUDE := -I$(srctree)/tools/include/uapi
ifneq ($(WERROR),0)
CLANG_OPTIONS += -Werror
endif
$(BPFTOOL):
$(Q)mkdir -p $(SKEL_TOOL_TMP_OUT)
$(Q)CFLAGS= $(MAKE) -C ../bpf/bpftool OUTPUT=$(SKEL_TOOL_TMP_OUT)/ bootstrap
# Paths to search for a kernel to generate vmlinux.h from.
VMLINUX_BTF_ELF_PATHS ?= $(if $(O),$(O)/vmlinux) \
$(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
../../vmlinux \
/boot/vmlinux-$(shell uname -r)
# Paths to BTF information.
VMLINUX_BTF_BTF_PATHS ?= /sys/kernel/btf/vmlinux
# Filter out kernels that don't exist or without a BTF section.
VMLINUX_BTF_ELF_ABSPATHS ?= $(abspath $(wildcard $(VMLINUX_BTF_ELF_PATHS)))
VMLINUX_BTF_PATHS ?= $(shell for file in $(VMLINUX_BTF_ELF_ABSPATHS); \
do \
if [ -f $$file ] && ($(READELF) -S "$$file" | grep -q .BTF); \
then \
echo "$$file"; \
fi; \
done) \
$(wildcard $(VMLINUX_BTF_BTF_PATHS))
# Select the first as the source of vmlinux.h.
VMLINUX_BTF ?= $(firstword $(VMLINUX_BTF_PATHS))
ifeq ($(VMLINUX_H_FILE),)
ifeq ($(VMLINUX_BTF),)
$(error Missing bpftool input for generating vmlinux.h)
endif
endif
$(VMLINUX_H): $(VMLINUX_BTF) $(BPFTOOL) $(VMLINUX_H_FILE)
$(call rule_mkdir)
ifeq ($(VMLINUX_H_FILE),)
$(QUIET_GEN)$(BPFTOOL) btf dump file $< format c > $@
else
$(Q)cp "$(VMLINUX_H_FILE)" $@
endif
# Consolidated Pattern rule for $(dir)/bpf_skel/
$(SKEL_TMP_OUT)/%.bpf.o: $(srctree)/tools/perf/$(dir)/bpf_skel/%.bpf.c $(LIBBPF) $(VMLINUX_H) $(OUTPUT)PERF-VERSION-FILE util/bpf_skel/perf_version.h
$(call rule_mkdir)
$(QUIET_CLANG)
$(Q)$(CLANG) -g -O2 -fno-stack-protector --target=bpf \
$(CLANG_OPTIONS) $(EXTRA_BPF_FLAGS) $(BPF_INCLUDE) $(TOOLS_UAPI_INCLUDE) \
-include $(OUTPUT)PERF-VERSION-FILE -include util/bpf_skel/perf_version.h \
-fms-extensions -Wno-microsoft-anon-tag \
-c $< -o $@
$(SKEL_OUT)/%.skel.h: $(SKEL_TMP_OUT)/%.bpf.o $(BPFTOOL)
$(call rule_mkdir)
$(QUIET_GENSKEL)
$(Q)$(BPFTOOL) gen skeleton $< > $@
.PRECIOUS: $(SKEL_TMP_OUT)/%.bpf.o
else # CONFIG_PERF_BPF_SKEL
.PHONY: bpf-skel-prepare
bpf-skel-prepare:
@:
endif # CONFIG_PERF_BPF_SKEL
clean:
$(call QUIET_CLEAN, bpf-skel) $(RM) -r $(SKEL_TOOL_TMP_OUT) $(OUTPUT)bench/bpf_skel/.tmp $(SKEL_TOOL_OUT)/*.skel.h $(OUTPUT)bench/bpf_skel/*.skel.h $(SKEL_TOOL_OUT)/vmlinux.h
.PHONY: clean
|
