am 33f02724: am 65744003: Merge "Revert "Revert "Revert "Revert "Add BacktraceOffline for offline backtracing."""""
* commit '33f027247da687a535ba2264fe98926a38742f68': Revert "Revert "Revert "Revert "Add BacktraceOffline for offline backtracing.""""
This commit is contained in:
Yabin Cui
Android Git Automerger
commit
112ca2b24e
10 changed files with 993 additions and 0 deletions
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@ -99,6 +99,7 @@ debuggerd_c_includes := \
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debuggerd_cpp_flags := \
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$(common_cppflags) \
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-Wno-missing-field-initializers \
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-fno-rtti \
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# Only build the host tests on linux.
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ifeq ($(HOST_OS),linux)
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@ -52,6 +52,12 @@ struct ucontext;
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typedef ucontext ucontext_t;
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#endif
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struct backtrace_stackinfo_t {
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uint64_t start;
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uint64_t end;
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const uint8_t* data;
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};
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class Backtrace {
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public:
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// Create the correct Backtrace object based on what is to be unwound.
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@ -66,6 +72,14 @@ public:
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// If map is not NULL, the map is still owned by the caller.
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static Backtrace* Create(pid_t pid, pid_t tid, BacktraceMap* map = NULL);
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// Create an offline Backtrace object that can be used to do an unwind without a process
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// that is still running. If cache_file is set to true, then elf information will be cached
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// for this call. The cached information survives until the calling process ends. This means
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// that subsequent calls to create offline Backtrace objects will continue to use the same
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// cache. It also assumes that the elf files used for each offline unwind are the same.
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static Backtrace* CreateOffline(pid_t pid, pid_t tid, BacktraceMap* map,
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const backtrace_stackinfo_t& stack, bool cache_file = false);
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virtual ~Backtrace();
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// Get the current stack trace and store in the backtrace_ structure.
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@ -31,6 +31,7 @@
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#include <deque>
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#include <string>
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#include <vector>
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struct backtrace_map_t {
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uintptr_t start = 0;
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@ -48,6 +49,8 @@ public:
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// is unsupported.
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static BacktraceMap* Create(pid_t pid, bool uncached = false);
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static BacktraceMap* Create(pid_t pid, const std::vector<backtrace_map_t>& maps);
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virtual ~BacktraceMap();
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// Fill in the map data structure for the given address.
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@ -69,7 +69,10 @@ LOCAL_LDLIBS := \
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$($(module)_ldlibs) \
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$($(module)_ldlibs_$(build_type)) \
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LOCAL_STRIP_MODULE := $($(module)_strip_module)
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ifeq ($(build_type),target)
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include $(LLVM_DEVICE_BUILD_MK)
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include $(BUILD_$(build_target))
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endif
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@ -77,6 +80,7 @@ ifeq ($(build_type),host)
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# Only build if host builds are supported.
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ifeq ($(build_host),true)
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LOCAL_CFLAGS += -Wno-extern-c-compat -fno-omit-frame-pointer
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include $(LLVM_HOST_BUILD_MK)
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include $(BUILD_HOST_$(build_target))
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endif
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endif
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@ -25,6 +25,7 @@ libbacktrace_common_conlyflags := \
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libbacktrace_common_cppflags := \
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-std=gnu++11 \
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-I external/libunwind/include/tdep \
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# The latest clang (r230699) does not allow SP/PC to be declared in inline asm lists.
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libbacktrace_common_clang_cflags += \
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@ -37,6 +38,9 @@ build_host := true
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endif
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endif
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LLVM_ROOT_PATH := external/llvm
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include $(LLVM_ROOT_PATH)/llvm.mk
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#-------------------------------------------------------------------------
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# The libbacktrace library.
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#-------------------------------------------------------------------------
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@ -44,6 +48,7 @@ libbacktrace_src_files := \
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Backtrace.cpp \
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BacktraceCurrent.cpp \
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BacktraceMap.cpp \
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BacktraceOffline.cpp \
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BacktracePtrace.cpp \
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thread_utils.c \
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ThreadEntry.cpp \
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@ -56,6 +61,20 @@ libbacktrace_shared_libraries := \
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liblog \
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libunwind \
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# Use shared llvm library on device to save space.
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libbacktrace_shared_libraries_target := \
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libLLVM \
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# Use static llvm libraries on host to remove dependency on 32-bit llvm shared library
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# which is not included in the prebuilt.
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libbacktrace_static_libraries_host := \
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libLLVMObject \
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libLLVMBitReader \
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libLLVMMC \
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libLLVMMCParser \
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libLLVMCore \
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libLLVMSupport \
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libbacktrace_ldlibs_host := \
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-lpthread \
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-lrt \
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@ -86,6 +105,8 @@ libbacktrace_test_cflags := \
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libbacktrace_test_src_files := \
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backtrace_testlib.c \
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libbacktrace_test_strip_module := false
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module := libbacktrace_test
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module_tag := debug
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build_type := target
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@ -107,6 +128,7 @@ backtrace_test_cflags_target := \
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-DENABLE_PSS_TESTS \
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backtrace_test_src_files := \
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backtrace_offline_test.cpp \
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backtrace_test.cpp \
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GetPss.cpp \
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thread_utils.c \
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@ -120,6 +142,7 @@ backtrace_test_shared_libraries := \
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libbacktrace \
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libbase \
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libcutils \
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libunwind \
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backtrace_test_shared_libraries_target += \
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libdl \
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@ -127,6 +150,8 @@ backtrace_test_shared_libraries_target += \
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backtrace_test_ldlibs_host += \
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-ldl \
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backtrace_test_strip_module := false
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module := backtrace_test
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module_tag := debug
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build_type := target
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@ -30,6 +30,7 @@
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#include <cutils/threads.h>
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#include "BacktraceLog.h"
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#include "BacktraceOffline.h"
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#include "thread_utils.h"
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#include "UnwindCurrent.h"
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#include "UnwindPtrace.h"
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@ -140,3 +141,8 @@ Backtrace* Backtrace::Create(pid_t pid, pid_t tid, BacktraceMap* map) {
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return new UnwindPtrace(pid, tid, map);
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}
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}
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Backtrace* Backtrace::CreateOffline(pid_t pid, pid_t tid, BacktraceMap* map,
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const backtrace_stackinfo_t& stack, bool cache_file) {
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return new BacktraceOffline(pid, tid, map, stack, cache_file);
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}
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@ -144,3 +144,13 @@ BacktraceMap* BacktraceMap::Create(pid_t pid, bool /*uncached*/) {
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return map;
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}
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#endif
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BacktraceMap* BacktraceMap::Create(pid_t pid, const std::vector<backtrace_map_t>& maps) {
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BacktraceMap* backtrace_map = new BacktraceMap(pid);
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backtrace_map->maps_.insert(backtrace_map->maps_.begin(), maps.begin(), maps.end());
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std::sort(backtrace_map->maps_.begin(), backtrace_map->maps_.end(),
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[](const backtrace_map_t& map1, const backtrace_map_t& map2) {
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return map1.start < map2.start;
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});
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return backtrace_map;
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}
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636
libbacktrace/BacktraceOffline.cpp
Normal file
636
libbacktrace/BacktraceOffline.cpp
Normal file
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@ -0,0 +1,636 @@
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/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "BacktraceOffline.h"
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extern "C" {
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#define UNW_REMOTE_ONLY
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#include <dwarf.h>
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}
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#include <stdint.h>
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#include <string.h>
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#include <sys/types.h>
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#include <ucontext.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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#include <backtrace/Backtrace.h>
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#include <backtrace/BacktraceMap.h>
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunused-parameter"
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#include <llvm/ADT/StringRef.h>
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#include <llvm/Object/Binary.h>
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#include <llvm/Object/ELFObjectFile.h>
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#include <llvm/Object/ObjectFile.h>
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#pragma clang diagnostic pop
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#include "BacktraceLog.h"
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void Space::Clear() {
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start = 0;
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end = 0;
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data = nullptr;
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}
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size_t Space::Read(uint64_t addr, uint8_t* buffer, size_t size) {
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if (addr >= start && addr < end) {
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size_t read_size = std::min(size, static_cast<size_t>(end - addr));
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memcpy(buffer, data + (addr - start), read_size);
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return read_size;
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}
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return 0;
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}
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static int FindProcInfo(unw_addr_space_t addr_space, unw_word_t ip, unw_proc_info* proc_info,
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int need_unwind_info, void* arg) {
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BacktraceOffline* backtrace = reinterpret_cast<BacktraceOffline*>(arg);
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bool result = backtrace->FindProcInfo(addr_space, ip, proc_info, need_unwind_info);
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return result ? 0 : -UNW_EINVAL;
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}
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static void PutUnwindInfo(unw_addr_space_t, unw_proc_info_t*, void*) {
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}
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static int GetDynInfoListAddr(unw_addr_space_t, unw_word_t*, void*) {
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return -UNW_ENOINFO;
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}
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static int AccessMem(unw_addr_space_t, unw_word_t addr, unw_word_t* value, int write, void* arg) {
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if (write == 1) {
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return -UNW_EINVAL;
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}
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BacktraceOffline* backtrace = reinterpret_cast<BacktraceOffline*>(arg);
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*value = 0;
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size_t read_size = backtrace->Read(addr, reinterpret_cast<uint8_t*>(value), sizeof(unw_word_t));
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// Strictly we should check if read_size matches sizeof(unw_word_t), but it is possible in
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// .eh_frame_hdr that the section can end at a position not aligned in sizeof(unw_word_t), and
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// we should permit the read at the end of the section.
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return (read_size > 0u ? 0 : -UNW_EINVAL);
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}
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static int AccessReg(unw_addr_space_t, unw_regnum_t unwind_reg, unw_word_t* value, int write,
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void* arg) {
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if (write == 1) {
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return -UNW_EINVAL;
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}
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BacktraceOffline* backtrace = reinterpret_cast<BacktraceOffline*>(arg);
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uint64_t reg_value;
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bool result = backtrace->ReadReg(unwind_reg, ®_value);
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if (result) {
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*value = static_cast<unw_word_t>(reg_value);
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}
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return result ? 0 : -UNW_EINVAL;
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}
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static int AccessFpReg(unw_addr_space_t, unw_regnum_t, unw_fpreg_t*, int, void*) {
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return -UNW_EINVAL;
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}
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static int Resume(unw_addr_space_t, unw_cursor_t*, void*) {
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return -UNW_EINVAL;
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}
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static int GetProcName(unw_addr_space_t, unw_word_t, char*, size_t, unw_word_t*, void*) {
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return -UNW_EINVAL;
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}
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static unw_accessors_t accessors = {
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.find_proc_info = FindProcInfo,
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.put_unwind_info = PutUnwindInfo,
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.get_dyn_info_list_addr = GetDynInfoListAddr,
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.access_mem = AccessMem,
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.access_reg = AccessReg,
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.access_fpreg = AccessFpReg,
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.resume = Resume,
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.get_proc_name = GetProcName,
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};
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bool BacktraceOffline::Unwind(size_t num_ignore_frames, ucontext_t* context) {
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if (context == nullptr) {
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BACK_LOGW("The context is needed for offline backtracing.");
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return false;
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}
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context_ = context;
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unw_addr_space_t addr_space = unw_create_addr_space(&accessors, 0);
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unw_cursor_t cursor;
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int ret = unw_init_remote(&cursor, addr_space, this);
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if (ret != 0) {
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BACK_LOGW("unw_init_remote failed %d", ret);
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unw_destroy_addr_space(addr_space);
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return false;
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}
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size_t num_frames = 0;
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do {
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unw_word_t pc;
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ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
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if (ret < 0) {
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BACK_LOGW("Failed to read IP %d", ret);
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break;
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}
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unw_word_t sp;
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ret = unw_get_reg(&cursor, UNW_REG_SP, &sp);
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if (ret < 0) {
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BACK_LOGW("Failed to read SP %d", ret);
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break;
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}
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if (num_ignore_frames == 0) {
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frames_.resize(num_frames + 1);
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backtrace_frame_data_t* frame = &frames_[num_frames];
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frame->num = num_frames;
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frame->pc = static_cast<uintptr_t>(pc);
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frame->sp = static_cast<uintptr_t>(sp);
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frame->stack_size = 0;
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if (num_frames > 0) {
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backtrace_frame_data_t* prev = &frames_[num_frames - 1];
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prev->stack_size = frame->sp - prev->sp;
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}
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frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);
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FillInMap(frame->pc, &frame->map);
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num_frames++;
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} else {
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num_ignore_frames--;
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}
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ret = unw_step(&cursor);
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} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
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unw_destroy_addr_space(addr_space);
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context_ = nullptr;
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return true;
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}
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bool BacktraceOffline::ReadWord(uintptr_t ptr, word_t* out_value) {
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size_t bytes_read = Read(ptr, reinterpret_cast<uint8_t*>(out_value), sizeof(word_t));
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return bytes_read == sizeof(word_t);
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}
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size_t BacktraceOffline::Read(uintptr_t addr, uint8_t* buffer, size_t bytes) {
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// Normally, libunwind needs stack information and call frame information to do remote unwinding.
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// If call frame information is stored in .debug_frame, libunwind can read it from file
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// by itself. If call frame information is stored in .eh_frame, we need to provide data in
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// .eh_frame/.eh_frame_hdr sections.
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||||
// The order of readings below doesn't matter, as the spaces don't overlap with each other.
|
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size_t read_size = eh_frame_hdr_space_.Read(addr, buffer, bytes);
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||||
if (read_size != 0) {
|
||||
return read_size;
|
||||
}
|
||||
read_size = eh_frame_space_.Read(addr, buffer, bytes);
|
||||
if (read_size != 0) {
|
||||
return read_size;
|
||||
}
|
||||
read_size = stack_space_.Read(addr, buffer, bytes);
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||||
return read_size;
|
||||
}
|
||||
|
||||
static bool FileOffsetToVaddr(
|
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const std::vector<DebugFrameInfo::EhFrame::ProgramHeader>& program_headers,
|
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uint64_t file_offset, uint64_t* vaddr) {
|
||||
for (auto& header : program_headers) {
|
||||
if (file_offset >= header.file_offset && file_offset < header.file_offset + header.file_size) {
|
||||
// TODO: Consider load_bias?
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||||
*vaddr = file_offset - header.file_offset + header.vaddr;
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||||
return true;
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||||
}
|
||||
}
|
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return false;
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||||
}
|
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|
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bool BacktraceOffline::FindProcInfo(unw_addr_space_t addr_space, uint64_t ip,
|
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unw_proc_info_t* proc_info, int need_unwind_info) {
|
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backtrace_map_t map;
|
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FillInMap(ip, &map);
|
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if (!BacktraceMap::IsValid(map)) {
|
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return false;
|
||||
}
|
||||
const std::string& filename = map.name;
|
||||
DebugFrameInfo* debug_frame = GetDebugFrameInFile(filename);
|
||||
if (debug_frame == nullptr) {
|
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return false;
|
||||
}
|
||||
if (debug_frame->is_eh_frame) {
|
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uint64_t ip_offset = ip - map.start + map.offset;
|
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uint64_t ip_vaddr; // vaddr in the elf file.
|
||||
bool result = FileOffsetToVaddr(debug_frame->eh_frame.program_headers, ip_offset, &ip_vaddr);
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if (!result) {
|
||||
return false;
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||||
}
|
||||
// Calculate the addresses where .eh_frame_hdr and .eh_frame stay when the process was running.
|
||||
eh_frame_hdr_space_.start = (ip - ip_vaddr) + debug_frame->eh_frame.eh_frame_hdr_vaddr;
|
||||
eh_frame_hdr_space_.end =
|
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eh_frame_hdr_space_.start + debug_frame->eh_frame.eh_frame_hdr_data.size();
|
||||
eh_frame_hdr_space_.data = debug_frame->eh_frame.eh_frame_hdr_data.data();
|
||||
|
||||
eh_frame_space_.start = (ip - ip_vaddr) + debug_frame->eh_frame.eh_frame_vaddr;
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||||
eh_frame_space_.end = eh_frame_space_.start + debug_frame->eh_frame.eh_frame_data.size();
|
||||
eh_frame_space_.data = debug_frame->eh_frame.eh_frame_data.data();
|
||||
|
||||
unw_dyn_info di;
|
||||
memset(&di, '\0', sizeof(di));
|
||||
di.start_ip = map.start;
|
||||
di.end_ip = map.end;
|
||||
di.format = UNW_INFO_FORMAT_REMOTE_TABLE;
|
||||
di.u.rti.name_ptr = 0;
|
||||
di.u.rti.segbase = eh_frame_hdr_space_.start;
|
||||
di.u.rti.table_data =
|
||||
eh_frame_hdr_space_.start + debug_frame->eh_frame.fde_table_offset_in_eh_frame_hdr;
|
||||
di.u.rti.table_len = (eh_frame_hdr_space_.end - di.u.rti.table_data) / sizeof(unw_word_t);
|
||||
int ret = dwarf_search_unwind_table(addr_space, ip, &di, proc_info, need_unwind_info, this);
|
||||
return ret == 0;
|
||||
}
|
||||
|
||||
eh_frame_hdr_space_.Clear();
|
||||
eh_frame_space_.Clear();
|
||||
unw_dyn_info_t di;
|
||||
unw_word_t segbase = map.start - map.offset;
|
||||
int found = dwarf_find_debug_frame(0, &di, ip, segbase, filename.c_str(), map.start, map.end);
|
||||
if (found == 1) {
|
||||
int ret = dwarf_search_unwind_table(addr_space, ip, &di, proc_info, need_unwind_info, this);
|
||||
return ret == 0;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
bool BacktraceOffline::ReadReg(size_t reg, uint64_t* value) {
|
||||
bool result = true;
|
||||
#if defined(__arm__)
|
||||
switch (reg) {
|
||||
case UNW_ARM_R0:
|
||||
*value = context_->uc_mcontext.arm_r0;
|
||||
break;
|
||||
case UNW_ARM_R1:
|
||||
*value = context_->uc_mcontext.arm_r1;
|
||||
break;
|
||||
case UNW_ARM_R2:
|
||||
*value = context_->uc_mcontext.arm_r2;
|
||||
break;
|
||||
case UNW_ARM_R3:
|
||||
*value = context_->uc_mcontext.arm_r3;
|
||||
break;
|
||||
case UNW_ARM_R4:
|
||||
*value = context_->uc_mcontext.arm_r4;
|
||||
break;
|
||||
case UNW_ARM_R5:
|
||||
*value = context_->uc_mcontext.arm_r5;
|
||||
break;
|
||||
case UNW_ARM_R6:
|
||||
*value = context_->uc_mcontext.arm_r6;
|
||||
break;
|
||||
case UNW_ARM_R7:
|
||||
*value = context_->uc_mcontext.arm_r7;
|
||||
break;
|
||||
case UNW_ARM_R8:
|
||||
*value = context_->uc_mcontext.arm_r8;
|
||||
break;
|
||||
case UNW_ARM_R9:
|
||||
*value = context_->uc_mcontext.arm_r9;
|
||||
break;
|
||||
case UNW_ARM_R10:
|
||||
*value = context_->uc_mcontext.arm_r10;
|
||||
break;
|
||||
case UNW_ARM_R11:
|
||||
*value = context_->uc_mcontext.arm_fp;
|
||||
break;
|
||||
case UNW_ARM_R12:
|
||||
*value = context_->uc_mcontext.arm_ip;
|
||||
break;
|
||||
case UNW_ARM_R13:
|
||||
*value = context_->uc_mcontext.arm_sp;
|
||||
break;
|
||||
case UNW_ARM_R14:
|
||||
*value = context_->uc_mcontext.arm_lr;
|
||||
break;
|
||||
case UNW_ARM_R15:
|
||||
*value = context_->uc_mcontext.arm_pc;
|
||||
break;
|
||||
default:
|
||||
result = false;
|
||||
}
|
||||
#elif defined(__aarch64__)
|
||||
if (reg <= UNW_AARCH64_PC) {
|
||||
*value = context_->uc_mcontext.regs[reg];
|
||||
} else {
|
||||
result = false;
|
||||
}
|
||||
#elif defined(__x86_64__)
|
||||
switch (reg) {
|
||||
case UNW_X86_64_R8:
|
||||
*value = context_->uc_mcontext.gregs[REG_R8];
|
||||
break;
|
||||
case UNW_X86_64_R9:
|
||||
*value = context_->uc_mcontext.gregs[REG_R9];
|
||||
break;
|
||||
case UNW_X86_64_R10:
|
||||
*value = context_->uc_mcontext.gregs[REG_R10];
|
||||
break;
|
||||
case UNW_X86_64_R11:
|
||||
*value = context_->uc_mcontext.gregs[REG_R11];
|
||||
break;
|
||||
case UNW_X86_64_R12:
|
||||
*value = context_->uc_mcontext.gregs[REG_R12];
|
||||
break;
|
||||
case UNW_X86_64_R13:
|
||||
*value = context_->uc_mcontext.gregs[REG_R13];
|
||||
break;
|
||||
case UNW_X86_64_R14:
|
||||
*value = context_->uc_mcontext.gregs[REG_R14];
|
||||
break;
|
||||
case UNW_X86_64_R15:
|
||||
*value = context_->uc_mcontext.gregs[REG_R15];
|
||||
break;
|
||||
case UNW_X86_64_RDI:
|
||||
*value = context_->uc_mcontext.gregs[REG_RDI];
|
||||
break;
|
||||
case UNW_X86_64_RSI:
|
||||
*value = context_->uc_mcontext.gregs[REG_RSI];
|
||||
break;
|
||||
case UNW_X86_64_RBP:
|
||||
*value = context_->uc_mcontext.gregs[REG_RBP];
|
||||
break;
|
||||
case UNW_X86_64_RBX:
|
||||
*value = context_->uc_mcontext.gregs[REG_RBX];
|
||||
break;
|
||||
case UNW_X86_64_RDX:
|
||||
*value = context_->uc_mcontext.gregs[REG_RDX];
|
||||
break;
|
||||
case UNW_X86_64_RAX:
|
||||
*value = context_->uc_mcontext.gregs[REG_RAX];
|
||||
break;
|
||||
case UNW_X86_64_RCX:
|
||||
*value = context_->uc_mcontext.gregs[REG_RCX];
|
||||
break;
|
||||
case UNW_X86_64_RSP:
|
||||
*value = context_->uc_mcontext.gregs[REG_RSP];
|
||||
break;
|
||||
case UNW_X86_64_RIP:
|
||||
*value = context_->uc_mcontext.gregs[REG_RIP];
|
||||
break;
|
||||
default:
|
||||
result = false;
|
||||
}
|
||||
#elif defined(__i386__)
|
||||
switch (reg) {
|
||||
case UNW_X86_GS:
|
||||
*value = context_->uc_mcontext.gregs[REG_GS];
|
||||
break;
|
||||
case UNW_X86_FS:
|
||||
*value = context_->uc_mcontext.gregs[REG_FS];
|
||||
break;
|
||||
case UNW_X86_ES:
|
||||
*value = context_->uc_mcontext.gregs[REG_ES];
|
||||
break;
|
||||
case UNW_X86_DS:
|
||||
*value = context_->uc_mcontext.gregs[REG_DS];
|
||||
break;
|
||||
case UNW_X86_EAX:
|
||||
*value = context_->uc_mcontext.gregs[REG_EAX];
|
||||
break;
|
||||
case UNW_X86_EBX:
|
||||
*value = context_->uc_mcontext.gregs[REG_EBX];
|
||||
break;
|
||||
case UNW_X86_ECX:
|
||||
*value = context_->uc_mcontext.gregs[REG_ECX];
|
||||
break;
|
||||
case UNW_X86_EDX:
|
||||
*value = context_->uc_mcontext.gregs[REG_EDX];
|
||||
break;
|
||||
case UNW_X86_ESI:
|
||||
*value = context_->uc_mcontext.gregs[REG_ESI];
|
||||
break;
|
||||
case UNW_X86_EDI:
|
||||
*value = context_->uc_mcontext.gregs[REG_EDI];
|
||||
break;
|
||||
case UNW_X86_EBP:
|
||||
*value = context_->uc_mcontext.gregs[REG_EBP];
|
||||
break;
|
||||
case UNW_X86_EIP:
|
||||
*value = context_->uc_mcontext.gregs[REG_EIP];
|
||||
break;
|
||||
case UNW_X86_ESP:
|
||||
*value = context_->uc_mcontext.gregs[REG_ESP];
|
||||
break;
|
||||
case UNW_X86_TRAPNO:
|
||||
*value = context_->uc_mcontext.gregs[REG_TRAPNO];
|
||||
break;
|
||||
case UNW_X86_CS:
|
||||
*value = context_->uc_mcontext.gregs[REG_CS];
|
||||
break;
|
||||
case UNW_X86_EFLAGS:
|
||||
*value = context_->uc_mcontext.gregs[REG_EFL];
|
||||
break;
|
||||
case UNW_X86_SS:
|
||||
*value = context_->uc_mcontext.gregs[REG_SS];
|
||||
break;
|
||||
default:
|
||||
result = false;
|
||||
}
|
||||
#endif
|
||||
return result;
|
||||
}
|
||||
|
||||
std::string BacktraceOffline::GetFunctionNameRaw(uintptr_t, uintptr_t* offset) {
|
||||
// We don't have enough information to support this. And it is expensive.
|
||||
*offset = 0;
|
||||
return "";
|
||||
}
|
||||
|
||||
std::unordered_map<std::string, std::unique_ptr<DebugFrameInfo>> BacktraceOffline::debug_frames_;
|
||||
std::unordered_set<std::string> BacktraceOffline::debug_frame_missing_files_;
|
||||
|
||||
static DebugFrameInfo* ReadDebugFrameFromFile(const std::string& filename);
|
||||
|
||||
DebugFrameInfo* BacktraceOffline::GetDebugFrameInFile(const std::string& filename) {
|
||||
if (cache_file_) {
|
||||
auto it = debug_frames_.find(filename);
|
||||
if (it != debug_frames_.end()) {
|
||||
return it->second.get();
|
||||
}
|
||||
if (debug_frame_missing_files_.find(filename) != debug_frame_missing_files_.end()) {
|
||||
return nullptr;
|
||||
}
|
||||
}
|
||||
DebugFrameInfo* debug_frame = ReadDebugFrameFromFile(filename);
|
||||
if (cache_file_) {
|
||||
if (debug_frame != nullptr) {
|
||||
debug_frames_.emplace(filename, std::unique_ptr<DebugFrameInfo>(debug_frame));
|
||||
} else {
|
||||
debug_frame_missing_files_.insert(filename);
|
||||
}
|
||||
} else {
|
||||
if (last_debug_frame_ != nullptr) {
|
||||
delete last_debug_frame_;
|
||||
}
|
||||
last_debug_frame_ = debug_frame;
|
||||
}
|
||||
return debug_frame;
|
||||
}
|
||||
|
||||
static bool OmitEncodedValue(uint8_t encode, const uint8_t*& p) {
|
||||
if (encode == DW_EH_PE_omit) {
|
||||
return 0;
|
||||
}
|
||||
uint8_t format = encode & 0x0f;
|
||||
switch (format) {
|
||||
case DW_EH_PE_ptr:
|
||||
p += sizeof(unw_word_t);
|
||||
break;
|
||||
case DW_EH_PE_uleb128:
|
||||
case DW_EH_PE_sleb128:
|
||||
while ((*p & 0x80) != 0) {
|
||||
++p;
|
||||
}
|
||||
++p;
|
||||
break;
|
||||
case DW_EH_PE_udata2:
|
||||
case DW_EH_PE_sdata2:
|
||||
p += 2;
|
||||
break;
|
||||
case DW_EH_PE_udata4:
|
||||
case DW_EH_PE_sdata4:
|
||||
p += 4;
|
||||
break;
|
||||
case DW_EH_PE_udata8:
|
||||
case DW_EH_PE_sdata8:
|
||||
p += 8;
|
||||
break;
|
||||
default:
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool GetFdeTableOffsetInEhFrameHdr(const std::vector<uint8_t>& data,
|
||||
uint64_t* table_offset_in_eh_frame_hdr) {
|
||||
const uint8_t* p = data.data();
|
||||
const uint8_t* end = p + data.size();
|
||||
if (p + 4 > end) {
|
||||
return false;
|
||||
}
|
||||
uint8_t version = *p++;
|
||||
if (version != 1) {
|
||||
return false;
|
||||
}
|
||||
uint8_t eh_frame_ptr_encode = *p++;
|
||||
uint8_t fde_count_encode = *p++;
|
||||
uint8_t fde_table_encode = *p++;
|
||||
|
||||
if (fde_table_encode != (DW_EH_PE_datarel | DW_EH_PE_sdata4)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
if (!OmitEncodedValue(eh_frame_ptr_encode, p) || !OmitEncodedValue(fde_count_encode, p)) {
|
||||
return false;
|
||||
}
|
||||
if (p >= end) {
|
||||
return false;
|
||||
}
|
||||
*table_offset_in_eh_frame_hdr = p - data.data();
|
||||
return true;
|
||||
}
|
||||
|
||||
using ProgramHeader = DebugFrameInfo::EhFrame::ProgramHeader;
|
||||
|
||||
template <class ELFT>
|
||||
DebugFrameInfo* ReadDebugFrameFromELFFile(const llvm::object::ELFFile<ELFT>* elf) {
|
||||
bool has_eh_frame_hdr = false;
|
||||
uint64_t eh_frame_hdr_vaddr = 0;
|
||||
std::vector<uint8_t> eh_frame_hdr_data;
|
||||
bool has_eh_frame = false;
|
||||
uint64_t eh_frame_vaddr = 0;
|
||||
std::vector<uint8_t> eh_frame_data;
|
||||
|
||||
for (auto it = elf->begin_sections(); it != elf->end_sections(); ++it) {
|
||||
llvm::ErrorOr<llvm::StringRef> name = elf->getSectionName(&*it);
|
||||
if (name) {
|
||||
if (name.get() == ".debug_frame") {
|
||||
DebugFrameInfo* debug_frame = new DebugFrameInfo;
|
||||
debug_frame->is_eh_frame = false;
|
||||
return debug_frame;
|
||||
}
|
||||
if (name.get() == ".eh_frame_hdr") {
|
||||
has_eh_frame_hdr = true;
|
||||
eh_frame_hdr_vaddr = it->sh_addr;
|
||||
llvm::ErrorOr<llvm::ArrayRef<uint8_t>> data = elf->getSectionContents(&*it);
|
||||
if (data) {
|
||||
eh_frame_hdr_data.insert(eh_frame_hdr_data.begin(), data->data(),
|
||||
data->data() + data->size());
|
||||
} else {
|
||||
return nullptr;
|
||||
}
|
||||
} else if (name.get() == ".eh_frame") {
|
||||
has_eh_frame = true;
|
||||
eh_frame_vaddr = it->sh_addr;
|
||||
llvm::ErrorOr<llvm::ArrayRef<uint8_t>> data = elf->getSectionContents(&*it);
|
||||
if (data) {
|
||||
eh_frame_data.insert(eh_frame_data.begin(), data->data(), data->data() + data->size());
|
||||
} else {
|
||||
return nullptr;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if (!(has_eh_frame_hdr && has_eh_frame)) {
|
||||
return nullptr;
|
||||
}
|
||||
uint64_t fde_table_offset;
|
||||
if (!GetFdeTableOffsetInEhFrameHdr(eh_frame_hdr_data, &fde_table_offset)) {
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
std::vector<ProgramHeader> program_headers;
|
||||
for (auto it = elf->begin_program_headers(); it != elf->end_program_headers(); ++it) {
|
||||
ProgramHeader header;
|
||||
header.vaddr = it->p_vaddr;
|
||||
header.file_offset = it->p_offset;
|
||||
header.file_size = it->p_filesz;
|
||||
program_headers.push_back(header);
|
||||
}
|
||||
DebugFrameInfo* debug_frame = new DebugFrameInfo;
|
||||
debug_frame->is_eh_frame = true;
|
||||
debug_frame->eh_frame.eh_frame_hdr_vaddr = eh_frame_hdr_vaddr;
|
||||
debug_frame->eh_frame.eh_frame_vaddr = eh_frame_vaddr;
|
||||
debug_frame->eh_frame.fde_table_offset_in_eh_frame_hdr = fde_table_offset;
|
||||
debug_frame->eh_frame.eh_frame_hdr_data = std::move(eh_frame_hdr_data);
|
||||
debug_frame->eh_frame.eh_frame_data = std::move(eh_frame_data);
|
||||
debug_frame->eh_frame.program_headers = program_headers;
|
||||
return debug_frame;
|
||||
}
|
||||
|
||||
static DebugFrameInfo* ReadDebugFrameFromFile(const std::string& filename) {
|
||||
auto owning_binary = llvm::object::createBinary(llvm::StringRef(filename));
|
||||
if (owning_binary.getError()) {
|
||||
return nullptr;
|
||||
}
|
||||
llvm::object::Binary* binary = owning_binary.get().getBinary();
|
||||
auto obj = llvm::dyn_cast<llvm::object::ObjectFile>(binary);
|
||||
if (obj == nullptr) {
|
||||
return nullptr;
|
||||
}
|
||||
if (auto elf = llvm::dyn_cast<llvm::object::ELF32LEObjectFile>(obj)) {
|
||||
return ReadDebugFrameFromELFFile(elf->getELFFile());
|
||||
}
|
||||
if (auto elf = llvm::dyn_cast<llvm::object::ELF64LEObjectFile>(obj)) {
|
||||
return ReadDebugFrameFromELFFile(elf->getELFFile());
|
||||
}
|
||||
return nullptr;
|
||||
}
|
||||
105
libbacktrace/BacktraceOffline.h
Normal file
105
libbacktrace/BacktraceOffline.h
Normal file
|
|
@ -0,0 +1,105 @@
|
|||
/*
|
||||
* Copyright (C) 2015 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
#ifndef _LIBBACKTRACE_UNWIND_OFFLINE_H
|
||||
#define _LIBBACKTRACE_UNWIND_OFFLINE_H
|
||||
|
||||
#include <libunwind.h>
|
||||
#include <stdint.h>
|
||||
#include <sys/types.h>
|
||||
#include <ucontext.h>
|
||||
|
||||
#include <unordered_map>
|
||||
#include <unordered_set>
|
||||
|
||||
#include <backtrace/Backtrace.h>
|
||||
|
||||
struct Space {
|
||||
uint64_t start;
|
||||
uint64_t end;
|
||||
const uint8_t* data;
|
||||
|
||||
Space() {
|
||||
Clear();
|
||||
}
|
||||
|
||||
void Clear();
|
||||
size_t Read(uint64_t addr, uint8_t* buffer, size_t size);
|
||||
};
|
||||
|
||||
struct DebugFrameInfo {
|
||||
bool is_eh_frame;
|
||||
struct EhFrame {
|
||||
uint64_t eh_frame_hdr_vaddr;
|
||||
uint64_t eh_frame_vaddr;
|
||||
uint64_t fde_table_offset_in_eh_frame_hdr;
|
||||
std::vector<uint8_t> eh_frame_hdr_data;
|
||||
std::vector<uint8_t> eh_frame_data;
|
||||
struct ProgramHeader {
|
||||
uint64_t vaddr;
|
||||
uint64_t file_offset;
|
||||
uint64_t file_size;
|
||||
};
|
||||
std::vector<ProgramHeader> program_headers;
|
||||
} eh_frame;
|
||||
};
|
||||
|
||||
class BacktraceOffline : public Backtrace {
|
||||
public:
|
||||
BacktraceOffline(pid_t pid, pid_t tid, BacktraceMap* map, const backtrace_stackinfo_t& stack,
|
||||
bool cache_file)
|
||||
: Backtrace(pid, tid, map),
|
||||
cache_file_(cache_file),
|
||||
context_(nullptr),
|
||||
last_debug_frame_(nullptr) {
|
||||
stack_space_.start = stack.start;
|
||||
stack_space_.end = stack.end;
|
||||
stack_space_.data = stack.data;
|
||||
}
|
||||
|
||||
virtual ~BacktraceOffline() {
|
||||
if (last_debug_frame_ != nullptr) {
|
||||
delete last_debug_frame_;
|
||||
}
|
||||
}
|
||||
|
||||
bool Unwind(size_t num_ignore_frames, ucontext_t* context) override;
|
||||
|
||||
bool ReadWord(uintptr_t ptr, word_t* out_value) override;
|
||||
|
||||
size_t Read(uintptr_t addr, uint8_t* buffer, size_t bytes) override;
|
||||
|
||||
bool FindProcInfo(unw_addr_space_t addr_space, uint64_t ip, unw_proc_info_t* proc_info,
|
||||
int need_unwind_info);
|
||||
|
||||
bool ReadReg(size_t reg_index, uint64_t* value);
|
||||
|
||||
protected:
|
||||
std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) override;
|
||||
DebugFrameInfo* GetDebugFrameInFile(const std::string& filename);
|
||||
|
||||
static std::unordered_map<std::string, std::unique_ptr<DebugFrameInfo>> debug_frames_;
|
||||
static std::unordered_set<std::string> debug_frame_missing_files_;
|
||||
|
||||
bool cache_file_;
|
||||
ucontext_t* context_;
|
||||
Space eh_frame_hdr_space_;
|
||||
Space eh_frame_space_;
|
||||
Space stack_space_;
|
||||
DebugFrameInfo* last_debug_frame_;
|
||||
};
|
||||
|
||||
#endif // _LIBBACKTRACE_BACKTRACE_OFFLINE_H
|
||||
189
libbacktrace/backtrace_offline_test.cpp
Normal file
189
libbacktrace/backtrace_offline_test.cpp
Normal file
|
|
@ -0,0 +1,189 @@
|
|||
#include <libunwind.h>
|
||||
#include <pthread.h>
|
||||
#include <stdint.h>
|
||||
#include <string.h>
|
||||
|
||||
#include <functional>
|
||||
#include <memory>
|
||||
#include <string>
|
||||
#include <utility>
|
||||
#include <vector>
|
||||
|
||||
#include <backtrace/Backtrace.h>
|
||||
#include <backtrace/BacktraceMap.h>
|
||||
#include <cutils/threads.h>
|
||||
|
||||
#include <gtest/gtest.h>
|
||||
|
||||
extern "C" {
|
||||
// Prototypes for functions in the test library.
|
||||
int test_level_one(int, int, int, int, void (*)(void*), void*);
|
||||
int test_level_two(int, int, int, int, void (*)(void*), void*);
|
||||
int test_level_three(int, int, int, int, void (*)(void*), void*);
|
||||
int test_level_four(int, int, int, int, void (*)(void*), void*);
|
||||
int test_recursive_call(int, void (*)(void*), void*);
|
||||
}
|
||||
|
||||
static volatile bool g_exit_flag = false;
|
||||
|
||||
static void GetContextAndExit(void* arg) {
|
||||
unw_context_t* unw_context = reinterpret_cast<unw_context_t*>(arg);
|
||||
unw_getcontext(unw_context);
|
||||
// Don't touch the stack anymore.
|
||||
while (!g_exit_flag) {
|
||||
}
|
||||
}
|
||||
|
||||
struct OfflineThreadArg {
|
||||
unw_context_t unw_context;
|
||||
pid_t tid;
|
||||
std::function<int(void (*)(void*), void*)> function;
|
||||
};
|
||||
|
||||
static void* OfflineThreadFunc(void* arg) {
|
||||
OfflineThreadArg* fn_arg = reinterpret_cast<OfflineThreadArg*>(arg);
|
||||
fn_arg->tid = gettid();
|
||||
fn_arg->function(GetContextAndExit, &fn_arg->unw_context);
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
static ucontext_t GetUContextFromUnwContext(const unw_context_t& unw_context) {
|
||||
ucontext_t ucontext;
|
||||
memset(&ucontext, 0, sizeof(ucontext));
|
||||
#if defined(__arm__)
|
||||
ucontext.uc_mcontext.arm_r0 = unw_context.regs[0];
|
||||
ucontext.uc_mcontext.arm_r1 = unw_context.regs[1];
|
||||
ucontext.uc_mcontext.arm_r2 = unw_context.regs[2];
|
||||
ucontext.uc_mcontext.arm_r3 = unw_context.regs[3];
|
||||
ucontext.uc_mcontext.arm_r4 = unw_context.regs[4];
|
||||
ucontext.uc_mcontext.arm_r5 = unw_context.regs[5];
|
||||
ucontext.uc_mcontext.arm_r6 = unw_context.regs[6];
|
||||
ucontext.uc_mcontext.arm_r7 = unw_context.regs[7];
|
||||
ucontext.uc_mcontext.arm_r8 = unw_context.regs[8];
|
||||
ucontext.uc_mcontext.arm_r9 = unw_context.regs[9];
|
||||
ucontext.uc_mcontext.arm_r10 = unw_context.regs[10];
|
||||
ucontext.uc_mcontext.arm_fp = unw_context.regs[11];
|
||||
ucontext.uc_mcontext.arm_ip = unw_context.regs[12];
|
||||
ucontext.uc_mcontext.arm_sp = unw_context.regs[13];
|
||||
ucontext.uc_mcontext.arm_lr = unw_context.regs[14];
|
||||
ucontext.uc_mcontext.arm_pc = unw_context.regs[15];
|
||||
#else
|
||||
ucontext.uc_mcontext = unw_context.uc_mcontext;
|
||||
#endif
|
||||
return ucontext;
|
||||
}
|
||||
|
||||
static void OfflineBacktraceFunctionCall(std::function<int(void (*)(void*), void*)> function,
|
||||
std::vector<uintptr_t>* pc_values) {
|
||||
// Create a thread to generate the needed stack and registers information.
|
||||
g_exit_flag = false;
|
||||
const size_t stack_size = 1024 * 1024;
|
||||
void* stack = mmap(NULL, stack_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
||||
ASSERT_NE(MAP_FAILED, stack);
|
||||
uintptr_t stack_addr = reinterpret_cast<uintptr_t>(stack);
|
||||
pthread_attr_t attr;
|
||||
ASSERT_EQ(0, pthread_attr_init(&attr));
|
||||
ASSERT_EQ(0, pthread_attr_setstack(&attr, reinterpret_cast<void*>(stack), stack_size));
|
||||
pthread_t thread;
|
||||
OfflineThreadArg arg;
|
||||
arg.function = function;
|
||||
ASSERT_EQ(0, pthread_create(&thread, &attr, OfflineThreadFunc, &arg));
|
||||
// Wait for the offline thread to generate the stack and unw_context information.
|
||||
sleep(1);
|
||||
// Copy the stack information.
|
||||
std::vector<uint8_t> stack_data(reinterpret_cast<uint8_t*>(stack),
|
||||
reinterpret_cast<uint8_t*>(stack) + stack_size);
|
||||
g_exit_flag = true;
|
||||
ASSERT_EQ(0, pthread_join(thread, nullptr));
|
||||
ASSERT_EQ(0, munmap(stack, stack_size));
|
||||
|
||||
// Do offline backtrace.
|
||||
std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(getpid()));
|
||||
ASSERT_TRUE(map != nullptr);
|
||||
|
||||
backtrace_stackinfo_t stack_info;
|
||||
stack_info.start = stack_addr;
|
||||
stack_info.end = stack_addr + stack_size;
|
||||
stack_info.data = stack_data.data();
|
||||
|
||||
std::unique_ptr<Backtrace> backtrace(
|
||||
Backtrace::CreateOffline(getpid(), arg.tid, map.get(), stack_info));
|
||||
ASSERT_TRUE(backtrace != nullptr);
|
||||
|
||||
ucontext_t ucontext = GetUContextFromUnwContext(arg.unw_context);
|
||||
ASSERT_TRUE(backtrace->Unwind(0, &ucontext));
|
||||
|
||||
// Collect pc values of the call stack frames.
|
||||
for (size_t i = 0; i < backtrace->NumFrames(); ++i) {
|
||||
pc_values->push_back(backtrace->GetFrame(i)->pc);
|
||||
}
|
||||
}
|
||||
|
||||
// Return the name of the function which matches the address. Although we don't know the
|
||||
// exact end of each function, it is accurate enough for the tests.
|
||||
static std::string FunctionNameForAddress(uintptr_t addr) {
|
||||
struct FunctionSymbol {
|
||||
std::string name;
|
||||
uintptr_t start;
|
||||
uintptr_t end;
|
||||
};
|
||||
|
||||
static std::vector<FunctionSymbol> symbols;
|
||||
if (symbols.empty()) {
|
||||
symbols = std::vector<FunctionSymbol>{
|
||||
{"unknown_start", 0, 0},
|
||||
{"test_level_one", reinterpret_cast<uintptr_t>(&test_level_one), 0},
|
||||
{"test_level_two", reinterpret_cast<uintptr_t>(&test_level_two), 0},
|
||||
{"test_level_three", reinterpret_cast<uintptr_t>(&test_level_three), 0},
|
||||
{"test_level_four", reinterpret_cast<uintptr_t>(&test_level_four), 0},
|
||||
{"test_recursive_call", reinterpret_cast<uintptr_t>(&test_recursive_call), 0},
|
||||
{"GetContextAndExit", reinterpret_cast<uintptr_t>(&GetContextAndExit), 0},
|
||||
{"unknown_end", static_cast<uintptr_t>(-1), static_cast<uintptr_t>(-1)},
|
||||
};
|
||||
std::sort(
|
||||
symbols.begin(), symbols.end(),
|
||||
[](const FunctionSymbol& s1, const FunctionSymbol& s2) { return s1.start < s2.start; });
|
||||
for (size_t i = 0; i + 1 < symbols.size(); ++i) {
|
||||
symbols[i].end = symbols[i + 1].start;
|
||||
}
|
||||
}
|
||||
for (auto& symbol : symbols) {
|
||||
if (addr >= symbol.start && addr < symbol.end) {
|
||||
return symbol.name;
|
||||
}
|
||||
}
|
||||
return "";
|
||||
}
|
||||
|
||||
TEST(libbacktrace, offline) {
|
||||
std::function<int(void (*)(void*), void*)> function =
|
||||
std::bind(test_level_one, 1, 2, 3, 4, std::placeholders::_1, std::placeholders::_2);
|
||||
std::vector<uintptr_t> pc_values;
|
||||
OfflineBacktraceFunctionCall(function, &pc_values);
|
||||
ASSERT_FALSE(pc_values.empty());
|
||||
ASSERT_LE(pc_values.size(), static_cast<size_t>(MAX_BACKTRACE_FRAMES));
|
||||
|
||||
size_t test_one_index = 0;
|
||||
for (size_t i = 0; i < pc_values.size(); ++i) {
|
||||
if (FunctionNameForAddress(pc_values[i]) == "test_level_one") {
|
||||
test_one_index = i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
ASSERT_GE(test_one_index, 3u);
|
||||
ASSERT_EQ("test_level_one", FunctionNameForAddress(pc_values[test_one_index]));
|
||||
ASSERT_EQ("test_level_two", FunctionNameForAddress(pc_values[test_one_index - 1]));
|
||||
ASSERT_EQ("test_level_three", FunctionNameForAddress(pc_values[test_one_index - 2]));
|
||||
ASSERT_EQ("test_level_four", FunctionNameForAddress(pc_values[test_one_index - 3]));
|
||||
}
|
||||
|
||||
TEST(libbacktrace, offline_max_trace) {
|
||||
std::function<int(void (*)(void*), void*)> function = std::bind(
|
||||
test_recursive_call, MAX_BACKTRACE_FRAMES + 10, std::placeholders::_1, std::placeholders::_2);
|
||||
std::vector<uintptr_t> pc_values;
|
||||
OfflineBacktraceFunctionCall(function, &pc_values);
|
||||
ASSERT_FALSE(pc_values.empty());
|
||||
ASSERT_EQ(static_cast<size_t>(MAX_BACKTRACE_FRAMES), pc_values.size());
|
||||
ASSERT_EQ("test_recursive_call", FunctionNameForAddress(pc_values.back()));
|
||||
}
|
||||
Loading…
Reference in a new issue