Initialize eBPF eh_frame stack unwinding

Signed-off-by: Kemal Akkoyun <[email protected]>

Author: kakkoyun

3rdparty/include/stdarg.h

@@ -0,0 +1,52 @@
+/*===---- stdarg.h - Variable argument handling ----------------------------===
+ *
+ * Copyright (c) 2008 Eli Friedman
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ *===-----------------------------------------------------------------------===
+ */
+
+#ifndef __STDARG_H
+#define __STDARG_H
+
+#ifndef _VA_LIST
+typedef __builtin_va_list va_list;
+#define _VA_LIST
+#endif
+#define va_start(ap, param) __builtin_va_start(ap, param)
+#define va_end(ap)          __builtin_va_end(ap)
+#define va_arg(ap, type)    __builtin_va_arg(ap, type)
+
+/* GCC always defines __va_copy, but does not define va_copy unless in c99 mode
+ * or -ansi is not specified, since it was not part of C90.
+ */
+#define __va_copy(d,s) __builtin_va_copy(d,s)
+
+#if __STDC_VERSION__ >= 199901L || __cplusplus >= 201103L || !defined(__STRICT_ANSI__)
+#define va_copy(dest, src)  __builtin_va_copy(dest, src)
+#endif
+
+/* Hack required to make standard headers work, at least on Ubuntu */
+#ifndef __GNUC_VA_LIST
+#define __GNUC_VA_LIST 1
+#endif
+typedef __builtin_va_list __gnuc_va_list;
+
+#endif /* __STDARG_H */

Makefile

@@ -124,10 +124,11 @@ go/deps:
 bpf: $(OUT_BPF)
 
 ifndef DOCKER
-$(OUT_BPF): $(BPF_SRC) | $(OUT_DIR)
+$(OUT_BPF): $(BPF_SRC) libbpf | $(OUT_DIR)
 	mkdir -p $(OUT_BPF_DIR)
 	$(MAKE) -C bpf build
-	cp bpf/target/bpfel-unknown-none/release/cpu-profiler $(OUT_BPF)
+	# cp bpf/target/bpfel-unknown-none/release/cpu-profiler $(OUT_BPF)
+	cp bpf/cpu/cpu.bpf.o $(OUT_BPF)
 else
 $(OUT_BPF): $(DOCKER_BUILDER) | $(OUT_DIR)
 	$(call docker_builder_make,$@)

bpf/Makefile

@@ -12,17 +12,22 @@ setup:
 	LLVM_SYS_140_PREFIX=$(LLVM_SYS_140_PREFIX) cargo install --locked --git https://github.com/aya-rs/bpf-linker --tag $(BPF_LINKER_VERSION) --no-default-features --features system-llvm -- bpf-linker
 
 .PHONY: build
-build:
+build: clang
 	cargo xtask build-ebpf --release
 
 .PHONY: clean
 clean:
 	cargo clean
+	rm -f $(OUT_BPF)
 
 .PHONY: format
-format:
+format: c/fmt
 	cargo fmt
 
+.PHONY: c/fmt
+c/fmt:
+	clang-format -i --style=LLVM $(BPF_SRC)
+
 .PHONY: format-check
 format-check:
 	cargo fmt --check
@@ -34,3 +39,79 @@ lint:
 
 lint-fix:
 	cargo clippy --fix
+
+# environment:
+ALL_ARCH ?= amd64 arm64
+ARCH_UNAME := $(shell uname -m)
+ifeq ($(ARCH_UNAME), x86_64)
+	ARCH ?= amd64
+else
+	ARCH ?= arm64
+endif
+ifeq ($(ARCH), amd64)
+	LINUX_ARCH ?= x86_64=x86
+else
+	LINUX_ARCH ?= aarch64=arm64
+endif
+
+# tools:
+CLANG ?= clang
+CMD_LLC ?= llc
+CMD_CC ?= $(CLANG)
+
+# output:
+OUT_DIR ?= ../dist
+
+OUT_BPF_DIR := cpu
+OUT_BPF := $(OUT_BPF_DIR)/cpu.bpf.o
+BPF_BUNDLE := $(OUT_DIR)/parca-agent.bpf.tar.gz
+
+# input:
+BPF_HEADERS := ../3rdparty/include
+LIBBPF_HEADERS := $(OUT_DIR)/libbpf/$(ARCH)/usr/include
+LIBBPF_OBJ := $(OUT_DIR)/libbpf/$(ARCH)/libbpf.a
+
+VMLINUX := cpu/vmlinux.h
+BPF_SRC := cpu/cpu.bpf.c
+
+# tasks:
+.PHONY: clang
+clang: $(OUT_BPF)
+
+bpf_bundle_dir := $(OUT_DIR)/parca-agent.bpf
+$(BPF_BUNDLE): $(BPF_SRC) $(LIBBPF_HEADERS)/bpf $(BPF_HEADERS)
+	mkdir -p $(bpf_bundle_dir)
+	cp $$(find $^ -type f) $(bpf_bundle_dir)
+
+$(OUT_BPF): $(BPF_SRC) $(LIBBPF_HEADERS) $(LIBBPF_OBJ) $(BPF_HEADERS) | $(OUT_DIR)
+	mkdir -p $(OUT_BPF_DIR)
+	$(CMD_CC) -S \
+		-D__BPF_TRACING__ \
+		-D__KERNEL__ \
+		-D__TARGET_ARCH_$(LINUX_ARCH) \
+		-I $(LIBBPF_HEADERS)/bpf \
+		-I $(BPF_HEADERS) \
+		-Wno-address-of-packed-member \
+		-Wno-compare-distinct-pointer-types \
+		-Wno-deprecated-declarations \
+		-Wno-gnu-variable-sized-type-not-at-end \
+		-Wno-pointer-sign \
+		-Wno-pragma-once-outside-header \
+		-Wno-unknown-warning-option \
+		-Wno-unused-value \
+		-Wdate-time \
+		-Wunused \
+		-Wall \
+		-fno-stack-protector \
+		-fno-jump-tables \
+		-fno-unwind-tables \
+		-fno-asynchronous-unwind-tables \
+		-xc \
+		-nostdinc \
+		-target bpf \
+		-O2 -emit-llvm -c -g $< -o $(@:.o=.ll)
+	$(CMD_LLC) -march=bpf -filetype=obj -o $@ $(@:.o=.ll)
+	rm $(@:.o=.ll)
+
+$(VMLINUX):
+	bpftool btf dump file /sys/kernel/btf/vmlinux format c > $@