diff --git a/libbacktrace/Android.bp b/libbacktrace/Android.bp index 5c7223418..200b6d637 100644 --- a/libbacktrace/Android.bp +++ b/libbacktrace/Android.bp @@ -117,4 +117,17 @@ cc_library_shared { }, cflags: ["-O0"], srcs: ["backtrace_testlib.c"], -} + + target: { + linux: { + shared_libs: [ + "libunwind", + ], + }, + android: { + shared_libs: [ + "libunwind", + ], + }, + } +} \ No newline at end of file diff --git a/libbacktrace/Android.mk b/libbacktrace/Android.mk index 0f0187293..f4976e954 100644 --- a/libbacktrace/Android.mk +++ b/libbacktrace/Android.mk @@ -111,8 +111,6 @@ backtrace_test_static_libraries_host := \ backtrace_test_ldlibs_host += \ -ldl \ -backtrace_test_strip_module := false - module := backtrace_test module_tag := debug build_type := target diff --git a/libbacktrace/BacktraceOffline.cpp b/libbacktrace/BacktraceOffline.cpp index a05a6d894..9e95563b0 100644 --- a/libbacktrace/BacktraceOffline.cpp +++ b/libbacktrace/BacktraceOffline.cpp @@ -50,6 +50,48 @@ extern "C" { #include "BacktraceLog.h" +struct EhFrame { + uint64_t hdr_vaddr; + uint64_t vaddr; + uint64_t fde_table_offset; + uintptr_t min_func_vaddr; + std::vector hdr_data; + std::vector data; +}; + +struct ArmIdxEntry { + uint32_t func_offset; + uint32_t value; +}; + +struct ArmExidx { + uint64_t exidx_vaddr; + uint64_t extab_vaddr; + std::vector exidx_data; + std::vector extab_data; + // There is a one-to-one map from exidx_data.func_offset to func_vaddr_array. + std::vector func_vaddr_array; +}; + +struct DebugFrameInfo { + bool has_arm_exidx; + bool has_eh_frame; + bool has_debug_frame; + bool has_gnu_debugdata; + + EhFrame eh_frame; + ArmExidx arm_exidx; + + uint64_t min_vaddr; + uint64_t text_end_vaddr; + + DebugFrameInfo() : has_arm_exidx(false), has_eh_frame(false), + has_debug_frame(false), has_gnu_debugdata(false) { } +}; + +static std::unordered_map>& g_debug_frames = + *new std::unordered_map>; + void Space::Clear() { start = 0; end = 0; @@ -207,23 +249,18 @@ size_t BacktraceOffline::Read(uintptr_t addr, uint8_t* buffer, size_t bytes) { if (read_size != 0) { return read_size; } + read_size = arm_exidx_space_.Read(addr, buffer, bytes); + if (read_size != 0) { + return read_size; + } + read_size = arm_extab_space_.Read(addr, buffer, bytes); + if (read_size != 0) { + return read_size; + } read_size = stack_space_.Read(addr, buffer, bytes); return read_size; } -static bool FileOffsetToVaddr( - const std::vector& program_headers, - 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? - *vaddr = file_offset - header.file_offset + header.vaddr; - return true; - } - } - return false; -} - bool BacktraceOffline::FindProcInfo(unw_addr_space_t addr_space, uint64_t ip, unw_proc_info_t* proc_info, int need_unwind_info) { backtrace_map_t map; @@ -236,45 +273,90 @@ bool BacktraceOffline::FindProcInfo(unw_addr_space_t addr_space, uint64_t ip, if (debug_frame == nullptr) { return false; } - if (debug_frame->is_eh_frame) { - uint64_t ip_offset = ip - map.start + map.offset; - uint64_t ip_vaddr; // vaddr in the elf file. - bool result = FileOffsetToVaddr(debug_frame->eh_frame.program_headers, ip_offset, &ip_vaddr); - if (!result) { - return false; - } - // 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 = - 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; - 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; + arm_exidx_space_.Clear(); + arm_extab_space_.Clear(); + + // vaddr in the elf file. + uint64_t ip_vaddr = ip - map.start + debug_frame->min_vaddr; + if (debug_frame->has_arm_exidx) { + auto& func_vaddrs = debug_frame->arm_exidx.func_vaddr_array; + if (ip_vaddr >= func_vaddrs[0] && ip_vaddr < debug_frame->text_end_vaddr) { + // Use binary search to find the correct function. + auto it = std::upper_bound(func_vaddrs.begin(), func_vaddrs.end(), + static_cast(ip_vaddr)); + if (it != func_vaddrs.begin()) { + --it; + // Found the exidx entry. + size_t index = it - func_vaddrs.begin(); + + proc_info->format = UNW_INFO_FORMAT_ARM_EXIDX; + proc_info->unwind_info = reinterpret_cast( + static_cast(index * sizeof(ArmIdxEntry) + + debug_frame->arm_exidx.exidx_vaddr + + debug_frame->min_vaddr)); + + // Prepare arm_exidx space and arm_extab space. + arm_exidx_space_.start = debug_frame->min_vaddr + debug_frame->arm_exidx.exidx_vaddr; + arm_exidx_space_.end = arm_exidx_space_.start + + debug_frame->arm_exidx.exidx_data.size() * sizeof(ArmIdxEntry); + arm_exidx_space_.data = reinterpret_cast( + debug_frame->arm_exidx.exidx_data.data()); + + arm_extab_space_.start = debug_frame->min_vaddr + debug_frame->arm_exidx.extab_vaddr; + arm_extab_space_.end = arm_extab_space_.start + + debug_frame->arm_exidx.extab_data.size(); + arm_extab_space_.data = debug_frame->arm_exidx.extab_data.data(); + return true; + } + } + } + + if (debug_frame->has_eh_frame) { + if (ip_vaddr >= debug_frame->eh_frame.min_func_vaddr && + ip_vaddr < debug_frame->text_end_vaddr) { + // Prepare eh_frame_hdr space and eh_frame space. + eh_frame_hdr_space_.start = ip - ip_vaddr + debug_frame->eh_frame.hdr_vaddr; + eh_frame_hdr_space_.end = + eh_frame_hdr_space_.start + debug_frame->eh_frame.hdr_data.size(); + eh_frame_hdr_space_.data = debug_frame->eh_frame.hdr_data.data(); + + eh_frame_space_.start = ip - ip_vaddr + debug_frame->eh_frame.vaddr; + eh_frame_space_.end = eh_frame_space_.start + debug_frame->eh_frame.data.size(); + eh_frame_space_.data = debug_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; + di.u.rti.table_len = (eh_frame_hdr_space_.end - di.u.rti.table_data) / sizeof(unw_word_t); + // TODO: Do it ourselves is more efficient than calling this function. + int ret = dwarf_search_unwind_table(addr_space, ip, &di, proc_info, need_unwind_info, this); + if (ret == 0) { + return true; + } + } + } + + if (debug_frame->has_debug_frame || debug_frame->has_gnu_debugdata) { + unw_dyn_info_t di; + unw_word_t segbase = map.start - map.offset; + // TODO: http://b/32916571 + // TODO: Do it ourselves is more efficient than calling libunwind functions. + 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); + if (ret == 0) { + return true; + } + } } return false; } @@ -462,33 +544,18 @@ std::string BacktraceOffline::GetFunctionNameRaw(uintptr_t, uintptr_t* offset) { return ""; } -std::unordered_map> BacktraceOffline::debug_frames_; -std::unordered_set 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()) { + auto it = g_debug_frames.find(filename); + if (it != g_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(debug_frame)); - } else { - debug_frame_missing_files_.insert(filename); - } - } else { - if (last_debug_frame_ != nullptr) { - delete last_debug_frame_; - } - last_debug_frame_ = debug_frame; + g_debug_frames.emplace(filename, std::unique_ptr(debug_frame)); } return debug_frame; } @@ -556,72 +623,106 @@ static bool GetFdeTableOffsetInEhFrameHdr(const std::vector& data, return true; } -using ProgramHeader = DebugFrameInfo::EhFrame::ProgramHeader; - template DebugFrameInfo* ReadDebugFrameFromELFFile(const llvm::object::ELFFile* elf) { + DebugFrameInfo* result = new DebugFrameInfo; + result->text_end_vaddr = std::numeric_limits::max(); + bool has_eh_frame_hdr = false; - uint64_t eh_frame_hdr_vaddr = 0; - std::vector eh_frame_hdr_data; bool has_eh_frame = false; - uint64_t eh_frame_vaddr = 0; - std::vector eh_frame_data; for (auto it = elf->section_begin(); it != elf->section_end(); ++it) { llvm::ErrorOr 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; + std::string s = name.get(); + if (s == ".debug_frame") { + result->has_debug_frame = true; + } else if (s == ".gnu_debugdata") { + result->has_gnu_debugdata = true; + } else if (s == ".eh_frame_hdr") { + result->eh_frame.hdr_vaddr = it->sh_addr; llvm::ErrorOr> 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; + result->eh_frame.hdr_data.insert(result->eh_frame.hdr_data.end(), + data->data(), data->data() + data->size()); + + uint64_t fde_table_offset; + if (GetFdeTableOffsetInEhFrameHdr(result->eh_frame.hdr_data, + &fde_table_offset)) { + result->eh_frame.fde_table_offset = fde_table_offset; + // Make sure we have at least one entry in fde_table. + if (fde_table_offset + 2 * sizeof(int32_t) <= data->size()) { + intptr_t eh_frame_hdr_vaddr = it->sh_addr; + int32_t sdata; + uint8_t* p = result->eh_frame.hdr_data.data() + fde_table_offset; + memcpy(&sdata, p, sizeof(sdata)); + result->eh_frame.min_func_vaddr = eh_frame_hdr_vaddr + sdata; + has_eh_frame_hdr = true; + } + } } - } else if (name.get() == ".eh_frame") { - has_eh_frame = true; - eh_frame_vaddr = it->sh_addr; + } else if (s == ".eh_frame") { + result->eh_frame.vaddr = it->sh_addr; llvm::ErrorOr> data = elf->getSectionContents(&*it); if (data) { - eh_frame_data.insert(eh_frame_data.begin(), data->data(), data->data() + data->size()); - } else { - return nullptr; + result->eh_frame.data.insert(result->eh_frame.data.end(), + data->data(), data->data() + data->size()); + has_eh_frame = true; } + } else if (s == ".ARM.exidx") { + result->arm_exidx.exidx_vaddr = it->sh_addr; + llvm::ErrorOr> data = elf->getSectionContents(&*it); + if (data) { + size_t entry_count = data->size() / sizeof(ArmIdxEntry); + result->arm_exidx.exidx_data.resize(entry_count); + memcpy(result->arm_exidx.exidx_data.data(), data->data(), + entry_count * sizeof(ArmIdxEntry)); + if (entry_count > 0u) { + // Change IdxEntry.func_offset into vaddr. + result->arm_exidx.func_vaddr_array.reserve(entry_count); + uint32_t vaddr = it->sh_addr; + for (auto& entry : result->arm_exidx.exidx_data) { + uint32_t func_offset = entry.func_offset + vaddr; + // Clear bit 31 for the prel31 offset. + // Arm sets bit 0 to mark it as thumb code, remove the flag. + result->arm_exidx.func_vaddr_array.push_back( + func_offset & 0x7ffffffe); + vaddr += 8; + } + result->has_arm_exidx = true; + } + } + } else if (s == ".ARM.extab") { + result->arm_exidx.extab_vaddr = it->sh_addr; + llvm::ErrorOr> data = elf->getSectionContents(&*it); + if (data) { + result->arm_exidx.extab_data.insert(result->arm_exidx.extab_data.end(), + data->data(), data->data() + data->size()); + } + } else if (s == ".text") { + result->text_end_vaddr = it->sh_addr + it->sh_size; } } } - 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; + + if (has_eh_frame_hdr && has_eh_frame) { + result->has_eh_frame = true; } - std::vector program_headers; + result->min_vaddr = std::numeric_limits::max(); for (auto it = elf->program_header_begin(); it != elf->program_header_end(); ++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); + if ((it->p_type == llvm::ELF::PT_LOAD) && (it->p_flags & llvm::ELF::PF_X)) { + if (it->p_vaddr < result->min_vaddr) { + result->min_vaddr = it->p_vaddr; + } + } } - 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; + if (!result->has_eh_frame && !result->has_arm_exidx && !result->has_debug_frame && + !result->has_gnu_debugdata) { + delete result; + return nullptr; + } + return result; } static bool IsValidElfPath(const std::string& filename) { diff --git a/libbacktrace/BacktraceOffline.h b/libbacktrace/BacktraceOffline.h index 42f826da9..c0b686e3f 100644 --- a/libbacktrace/BacktraceOffline.h +++ b/libbacktrace/BacktraceOffline.h @@ -40,22 +40,7 @@ struct Space { 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 eh_frame_hdr_data; - std::vector eh_frame_data; - struct ProgramHeader { - uint64_t vaddr; - uint64_t file_offset; - uint64_t file_size; - }; - std::vector program_headers; - } eh_frame; -}; +struct DebugFrameInfo; class BacktraceOffline : public Backtrace { public: @@ -63,18 +48,13 @@ class BacktraceOffline : public Backtrace { bool cache_file) : Backtrace(pid, tid, map), cache_file_(cache_file), - context_(nullptr), - last_debug_frame_(nullptr) { + context_(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_; - } - } + virtual ~BacktraceOffline() = default; bool Unwind(size_t num_ignore_frames, ucontext_t* context) override; @@ -91,15 +71,13 @@ class BacktraceOffline : public Backtrace { std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) override; DebugFrameInfo* GetDebugFrameInFile(const std::string& filename); - static std::unordered_map> debug_frames_; - static std::unordered_set debug_frame_missing_files_; - bool cache_file_; ucontext_t* context_; Space eh_frame_hdr_space_; Space eh_frame_space_; + Space arm_extab_space_; + Space arm_exidx_space_; Space stack_space_; - DebugFrameInfo* last_debug_frame_; }; #endif // _LIBBACKTRACE_BACKTRACE_OFFLINE_H diff --git a/libbacktrace/backtrace_offline_test.cpp b/libbacktrace/backtrace_offline_test.cpp index d6dc2c960..49fcb29c4 100644 --- a/libbacktrace/backtrace_offline_test.cpp +++ b/libbacktrace/backtrace_offline_test.cpp @@ -1,3 +1,20 @@ +/* + * 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. + */ + +#include #include #include #include @@ -9,6 +26,9 @@ #include #include +#include +#include +#include #include #include #include @@ -22,29 +42,7 @@ 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(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 function; -}; - -static void* OfflineThreadFunc(void* arg) { - OfflineThreadArg* fn_arg = reinterpret_cast(arg); - fn_arg->tid = gettid(); - fn_arg->function(GetContextAndExit, &fn_arg->unw_context); - return nullptr; +void test_get_context_and_wait(unw_context_t* unw_context, volatile int* exit_flag); } static ucontext_t GetUContextFromUnwContext(const unw_context_t& unw_context) { @@ -73,11 +71,68 @@ static ucontext_t GetUContextFromUnwContext(const unw_context_t& unw_context) { return ucontext; } -static void OfflineBacktraceFunctionCall(const std::function& function, - std::vector* pc_values) { +struct FunctionSymbol { + std::string name; + uintptr_t start; + uintptr_t end; +}; + +static std::vector GetFunctionSymbols() { + std::vector symbols = { + {"unknown_start", 0, 0}, + {"test_level_one", reinterpret_cast(&test_level_one), 0}, + {"test_level_two", reinterpret_cast(&test_level_two), 0}, + {"test_level_three", reinterpret_cast(&test_level_three), 0}, + {"test_level_four", reinterpret_cast(&test_level_four), 0}, + {"test_recursive_call", reinterpret_cast(&test_recursive_call), 0}, + {"test_get_context_and_wait", reinterpret_cast(&test_get_context_and_wait), 0}, + {"unknown_end", static_cast(-1), static_cast(-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; + } + return symbols; +} + +static std::string RawDataToHexString(const void* data, size_t size) { + const uint8_t* p = static_cast(data); + std::string s; + for (size_t i = 0; i < size; ++i) { + s += android::base::StringPrintf("%02x", p[i]); + } + return s; +} + +static void HexStringToRawData(const char* s, void* data, size_t size) { + uint8_t* p = static_cast(data); + for (size_t i = 0; i < size; ++i) { + int value; + sscanf(s, "%02x", &value); + *p++ = static_cast(value); + s += 2; + } +} + +struct OfflineThreadArg { + unw_context_t unw_context; + pid_t tid; + volatile int exit_flag; +}; + +static void* OfflineThreadFunc(void* arg) { + OfflineThreadArg* fn_arg = reinterpret_cast(arg); + fn_arg->tid = gettid(); + test_get_context_and_wait(&fn_arg->unw_context, &fn_arg->exit_flag); + return nullptr; +} + +// This test is disable because it is for generating test data. +TEST(libbacktrace, DISABLED_generate_offline_testdata) { // Create a thread to generate the needed stack and registers information. - g_exit_flag = false; - const size_t stack_size = 1024 * 1024; + const size_t stack_size = 16 * 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(stack); @@ -86,18 +141,17 @@ static void OfflineBacktraceFunctionCall(const std::function(stack), stack_size)); pthread_t thread; OfflineThreadArg arg; - arg.function = function; + arg.exit_flag = 0; 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 stack_data(reinterpret_cast(stack), reinterpret_cast(stack) + stack_size); - g_exit_flag = true; + arg.exit_flag = 1; ASSERT_EQ(0, pthread_join(thread, nullptr)); ASSERT_EQ(0, munmap(stack, stack_size)); - // Do offline backtrace. std::unique_ptr map(BacktraceMap::Create(getpid())); ASSERT_TRUE(map != nullptr); @@ -106,47 +160,44 @@ static void OfflineBacktraceFunctionCall(const std::function 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); + // Generate offline testdata. + std::string testdata; + // 1. Dump pid, tid + testdata += android::base::StringPrintf("pid: %d tid: %d\n", getpid(), arg.tid); + // 2. Dump maps + for (auto it = map->begin(); it != map->end(); ++it) { + testdata += android::base::StringPrintf( + "map: start: %" PRIxPTR " end: %" PRIxPTR " offset: %" PRIxPTR + " load_base: %" PRIxPTR " flags: %d name: %s\n", + it->start, it->end, it->offset, it->load_base, it->flags, it->name.c_str()); } + // 3. Dump registers + testdata += android::base::StringPrintf("registers: %zu ", sizeof(arg.unw_context)); + testdata += RawDataToHexString(&arg.unw_context, sizeof(arg.unw_context)); + testdata.push_back('\n'); + + // 4. Dump stack + testdata += android::base::StringPrintf( + "stack: start: %" PRIx64 " end: %" PRIx64 " size: %zu ", + stack_info.start, stack_info.end, stack_data.size()); + testdata += RawDataToHexString(stack_data.data(), stack_data.size()); + testdata.push_back('\n'); + + // 5. Dump function symbols + std::vector function_symbols = GetFunctionSymbols(); + for (const auto& symbol : function_symbols) { + testdata += android::base::StringPrintf( + "function: start: %" PRIxPTR " end: %" PRIxPTR" name: %s\n", + symbol.start, symbol.end, symbol.name.c_str()); + } + + ASSERT_TRUE(android::base::WriteStringToFile(testdata, "offline_testdata")); } // 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 symbols; - if (symbols.empty()) { - symbols = std::vector{ - {"unknown_start", 0, 0}, - {"test_level_one", reinterpret_cast(&test_level_one), 0}, - {"test_level_two", reinterpret_cast(&test_level_two), 0}, - {"test_level_three", reinterpret_cast(&test_level_three), 0}, - {"test_level_four", reinterpret_cast(&test_level_four), 0}, - {"test_recursive_call", reinterpret_cast(&test_recursive_call), 0}, - {"GetContextAndExit", reinterpret_cast(&GetContextAndExit), 0}, - {"unknown_end", static_cast(-1), static_cast(-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; - } - } +static std::string FunctionNameForAddress(uintptr_t addr, + const std::vector& symbols) { for (auto& symbol : symbols) { if (addr >= symbol.start && addr < symbol.end) { return symbol.name; @@ -155,35 +206,136 @@ static std::string FunctionNameForAddress(uintptr_t addr) { return ""; } -TEST(libbacktrace, offline) { - std::function function = - std::bind(test_level_one, 1, 2, 3, 4, std::placeholders::_1, std::placeholders::_2); +static std::string GetArch() { +#if defined(__arm__) + return "arm"; +#elif defined(__aarch64__) + return "aarch64"; +#elif defined(__i386__) + return "x86"; +#elif defined(__x86_64__) + return "x86_64"; +#else + return ""; +#endif +} + +static void BacktraceOfflineTest(const std::string& testlib_name) { + const std::string arch = GetArch(); + if (arch.empty()) { + GTEST_LOG_(INFO) << "This test does nothing on current arch."; + return; + } + const std::string offline_testdata_path = "testdata/" + arch + "/offline_testdata"; + std::string testdata; + ASSERT_TRUE(android::base::ReadFileToString(offline_testdata_path, &testdata)); + + const std::string testlib_path = "testdata/" + arch + "/" + testlib_name; + struct stat st; + if (stat(testlib_path.c_str(), &st) == -1) { + GTEST_LOG_(INFO) << "This test is skipped as " << testlib_path << " doesn't exist."; + return; + } + + // Parse offline_testdata. + std::vector lines = android::base::Split(testdata, "\n"); + int pid; + int tid; + std::vector maps; + unw_context_t unw_context; + backtrace_stackinfo_t stack_info; + std::vector stack; + std::vector symbols; + for (const auto& line : lines) { + if (android::base::StartsWith(line, "pid:")) { + sscanf(line.c_str(), "pid: %d tid: %d", &pid, &tid); + } else if (android::base::StartsWith(line, "map:")) { + maps.resize(maps.size() + 1); + int pos; + sscanf(line.c_str(), + "map: start: %" SCNxPTR " end: %" SCNxPTR " offset: %" SCNxPTR + " load_base: %" SCNxPTR " flags: %d name: %n", + &maps.back().start, &maps.back().end, &maps.back().offset, + &maps.back().load_base, &maps.back().flags, &pos); + maps.back().name = android::base::Trim(line.substr(pos)); + } else if (android::base::StartsWith(line, "registers:")) { + size_t size; + int pos; + sscanf(line.c_str(), "registers: %zu %n", &size, &pos); + ASSERT_EQ(sizeof(unw_context), size); + HexStringToRawData(&line[pos], &unw_context, size); + } else if (android::base::StartsWith(line, "stack:")) { + size_t size; + int pos; + sscanf(line.c_str(), + "stack: start: %" SCNx64 " end: %" SCNx64 " size: %zu %n", + &stack_info.start, &stack_info.end, &size, &pos); + stack.resize(size); + HexStringToRawData(&line[pos], &stack[0], size); + stack_info.data = stack.data(); + } else if (android::base::StartsWith(line, "function:")) { + symbols.resize(symbols.size() + 1); + int pos; + sscanf(line.c_str(), + "function: start: %" SCNxPTR " end: %" SCNxPTR " name: %n", + &symbols.back().start, &symbols.back().end, + &pos); + symbols.back().name = line.substr(pos); + } + } + + // Fix path of libbacktrace_testlib.so. + for (auto& map : maps) { + if (map.name.find("libbacktrace_test.so") != std::string::npos) { + map.name = testlib_path; + } + } + + // Do offline backtrace. + std::unique_ptr map(BacktraceMap::Create(pid, maps)); + ASSERT_TRUE(map != nullptr); + + std::unique_ptr backtrace( + Backtrace::CreateOffline(pid, tid, map.get(), stack_info)); + ASSERT_TRUE(backtrace != nullptr); + + ucontext_t ucontext = GetUContextFromUnwContext(unw_context); + ASSERT_TRUE(backtrace->Unwind(0, &ucontext)); + + + // Collect pc values of the call stack frames. std::vector pc_values; - OfflineBacktraceFunctionCall(function, &pc_values); - ASSERT_FALSE(pc_values.empty()); - ASSERT_LE(pc_values.size(), static_cast(MAX_BACKTRACE_FRAMES)); + for (size_t i = 0; i < backtrace->NumFrames(); ++i) { + pc_values.push_back(backtrace->GetFrame(i)->pc); + } size_t test_one_index = 0; for (size_t i = 0; i < pc_values.size(); ++i) { - if (FunctionNameForAddress(pc_values[i]) == "test_level_one") { + if (FunctionNameForAddress(pc_values[i], symbols) == "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])); + ASSERT_EQ("test_level_one", FunctionNameForAddress(pc_values[test_one_index], symbols)); + ASSERT_EQ("test_level_two", FunctionNameForAddress(pc_values[test_one_index - 1], symbols)); + ASSERT_EQ("test_level_three", FunctionNameForAddress(pc_values[test_one_index - 2], symbols)); + ASSERT_EQ("test_level_four", FunctionNameForAddress(pc_values[test_one_index - 3], symbols)); } -TEST(libbacktrace, offline_max_trace) { - std::function function = std::bind( - test_recursive_call, MAX_BACKTRACE_FRAMES + 10, std::placeholders::_1, std::placeholders::_2); - std::vector pc_values; - OfflineBacktraceFunctionCall(function, &pc_values); - ASSERT_FALSE(pc_values.empty()); - ASSERT_EQ(static_cast(MAX_BACKTRACE_FRAMES), pc_values.size()); - ASSERT_EQ("test_recursive_call", FunctionNameForAddress(pc_values.back())); +TEST(libbacktrace, offline_eh_frame) { + BacktraceOfflineTest("libbacktrace_test_eh_frame.so"); +} + +TEST(libbacktrace, offline_debug_frame) { + BacktraceOfflineTest("libbacktrace_test_debug_frame.so"); +} + +TEST(libbacktrace, offline_gnu_debugdata) { + BacktraceOfflineTest("libbacktrace_test_gnu_debugdata.so"); +} + +TEST(libbacktrace, offline_arm_exidx) { + BacktraceOfflineTest("libbacktrace_test_arm_exidx.so"); } diff --git a/libbacktrace/backtrace_testlib.c b/libbacktrace/backtrace_testlib.c index d4d15dbba..6f6b53508 100644 --- a/libbacktrace/backtrace_testlib.c +++ b/libbacktrace/backtrace_testlib.c @@ -14,6 +14,7 @@ * limitations under the License. */ +#include #include int test_level_four(int one, int two, int three, int four, @@ -53,3 +54,23 @@ int test_recursive_call(int level, void (*callback_func)(void*), void* data) { } return 0; } + +typedef struct { + unw_context_t* unw_context; + volatile int* exit_flag; +} GetContextArg; + +static void GetContextAndExit(void* data) { + GetContextArg* arg = (GetContextArg*)data; + unw_getcontext(arg->unw_context); + // Don't touch the stack anymore. + while (*arg->exit_flag == 0) { + } +} + +void test_get_context_and_wait(unw_context_t* unw_context, volatile int* exit_flag) { + GetContextArg arg; + arg.unw_context = unw_context; + arg.exit_flag = exit_flag; + test_level_one(1, 2, 3, 4, GetContextAndExit, &arg); +} diff --git a/libbacktrace/testdata/aarch64/libbacktrace_test_eh_frame.so b/libbacktrace/testdata/aarch64/libbacktrace_test_eh_frame.so new file mode 100755 index 000000000..880f33796 Binary files /dev/null and b/libbacktrace/testdata/aarch64/libbacktrace_test_eh_frame.so differ diff --git a/libbacktrace/testdata/aarch64/offline_testdata b/libbacktrace/testdata/aarch64/offline_testdata new file mode 100644 index 000000000..ba44e0990 --- /dev/null +++ b/libbacktrace/testdata/aarch64/offline_testdata @@ -0,0 +1,107 @@ +pid: 32438 tid: 32439 +map: start: 557066e000 end: 55706ee000 offset: 0 load_base: 0 flags: 5 name: /data/backtrace_test64 +map: start: 55706ef000 end: 55706f2000 offset: 80000 load_base: 0 flags: 1 name: /data/backtrace_test64 +map: start: 55706f2000 end: 55706f3000 offset: 83000 load_base: 0 flags: 3 name: /data/backtrace_test64 +map: start: 7014200000 end: 7014600000 offset: 0 load_base: 0 flags: 3 name: [anon:libc_malloc] +map: start: 701464c000 end: 701465c000 offset: 0 load_base: 0 flags: 5 name: /system/lib64/libcutils.so +map: start: 701465c000 end: 701465d000 offset: 0 load_base: 0 flags: 0 name: +map: start: 701465d000 end: 701465e000 offset: 10000 load_base: 0 flags: 1 name: /system/lib64/libcutils.so +map: start: 701465e000 end: 701465f000 offset: 11000 load_base: 0 flags: 3 name: /system/lib64/libcutils.so +map: start: 7014691000 end: 70146b5000 offset: 0 load_base: 0 flags: 5 name: /system/lib64/liblzma.so +map: start: 70146b5000 end: 70146b6000 offset: 23000 load_base: 0 flags: 1 name: /system/lib64/liblzma.so +map: start: 70146b6000 end: 70146b7000 offset: 24000 load_base: 0 flags: 3 name: /system/lib64/liblzma.so +map: start: 70146b7000 end: 70146bc000 offset: 0 load_base: 0 flags: 3 name: [anon:.bss] +map: start: 70146c9000 end: 70158b5000 offset: 0 load_base: af000 flags: 5 name: /system/lib64/libLLVM.so +map: start: 70158b5000 end: 701596b000 offset: 11eb000 load_base: 0 flags: 1 name: /system/lib64/libLLVM.so +map: start: 701596b000 end: 701596c000 offset: 12a1000 load_base: 0 flags: 3 name: /system/lib64/libLLVM.so +map: start: 701596c000 end: 701599f000 offset: 0 load_base: 0 flags: 3 name: [anon:.bss] +map: start: 70159c2000 end: 70159f9000 offset: 0 load_base: 0 flags: 5 name: /system/lib64/libm.so +map: start: 70159f9000 end: 70159fa000 offset: 36000 load_base: 0 flags: 1 name: /system/lib64/libm.so +map: start: 70159fa000 end: 70159fb000 offset: 37000 load_base: 0 flags: 3 name: /system/lib64/libm.so +map: start: 7015a1e000 end: 7015a2e000 offset: 0 load_base: 0 flags: 5 name: /system/lib64/libbacktrace.so +map: start: 7015a2e000 end: 7015a2f000 offset: f000 load_base: 0 flags: 1 name: /system/lib64/libbacktrace.so +map: start: 7015a2f000 end: 7015a30000 offset: 10000 load_base: 0 flags: 3 name: /system/lib64/libbacktrace.so +map: start: 7015a5e000 end: 7015a7d000 offset: 0 load_base: 1000 flags: 5 name: /system/lib64/libutils.so +map: start: 7015a7d000 end: 7015a7e000 offset: 0 load_base: 0 flags: 0 name: +map: start: 7015a7e000 end: 7015a7f000 offset: 1f000 load_base: 0 flags: 1 name: /system/lib64/libutils.so +map: start: 7015a7f000 end: 7015a80000 offset: 20000 load_base: 0 flags: 3 name: 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