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authorYabin Cui <yabinc@google.com>2016-11-15 17:47:09 -0800
committerYabin Cui <yabinc@google.com>2016-12-07 10:25:33 -0800
commit5d991bc351faf86ae08a6db248509e1650253156 (patch)
treee7f0b94189e633236a879ab059ce42f56de79fc3 /libbacktrace
parent6e5f730243edb6232c6ce2ce9027b19c7a5628bf (diff)
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libbacktrace_offline: support .ARM.exidx.
1. Read .ARM.exidx and .ARM.extab, provides these data to libunwind through AccessMem. 2. In FindProcInfo, search .ARM.exidx for the idx entry of function containing ip. 3. Add structures to store .ARM.exidx info in DebugFrameInfo, and clean up the structure. 4. Add tests to test each unwind information (.eh_frame, .debug_frame, .gnu_debugdata, .ARM.exidx) separately. Bug: http://b/30974693 Test: run backtrace_test. Test: run simpleperf runtest.py. Change-Id: I9377a54379158bd35860efcf0e011423be7350d4
Diffstat (limited to 'libbacktrace')
-rw-r--r--libbacktrace/Android.bp15
-rw-r--r--libbacktrace/Android.mk2
-rw-r--r--libbacktrace/BacktraceOffline.cpp327
-rw-r--r--libbacktrace/BacktraceOffline.h32
-rw-r--r--libbacktrace/backtrace_offline_test.cpp318
-rw-r--r--libbacktrace/backtrace_testlib.c21
-rwxr-xr-xlibbacktrace/testdata/aarch64/libbacktrace_test_eh_frame.sobin0 -> 12232 bytes
-rw-r--r--libbacktrace/testdata/aarch64/offline_testdata107
-rwxr-xr-xlibbacktrace/testdata/arm/libbacktrace_test_arm_exidx.sobin0 -> 13804 bytes
-rwxr-xr-xlibbacktrace/testdata/arm/libbacktrace_test_debug_frame.sobin0 -> 99808 bytes
-rwxr-xr-xlibbacktrace/testdata/arm/libbacktrace_test_gnu_debugdata.sobin0 -> 36456 bytes
-rw-r--r--libbacktrace/testdata/arm/offline_testdata105
-rwxr-xr-xlibbacktrace/testdata/x86/libbacktrace_test_debug_frame.sobin0 -> 12907 bytes
-rwxr-xr-xlibbacktrace/testdata/x86/libbacktrace_test_gnu_debugdata.sobin0 -> 8572 bytes
-rw-r--r--libbacktrace/testdata/x86/offline_testdata82
-rwxr-xr-xlibbacktrace/testdata/x86_64/libbacktrace_test_eh_frame.sobin0 -> 16752 bytes
-rw-r--r--libbacktrace/testdata/x86_64/offline_testdata93
17 files changed, 876 insertions, 226 deletions
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<uint8_t> hdr_data;
+ std::vector<uint8_t> data;
+};
+
+struct ArmIdxEntry {
+ uint32_t func_offset;
+ uint32_t value;
+};
+
+struct ArmExidx {
+ uint64_t exidx_vaddr;
+ uint64_t extab_vaddr;
+ std::vector<ArmIdxEntry> exidx_data;
+ std::vector<uint8_t> extab_data;
+ // There is a one-to-one map from exidx_data.func_offset to func_vaddr_array.
+ std::vector<uint32_t> 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<std::string, std::unique_ptr<DebugFrameInfo>>& g_debug_frames =
+ *new std::unordered_map<std::string, std::unique_ptr<DebugFrameInfo>>;
+
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<DebugFrameInfo::EhFrame::ProgramHeader>& 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<uint32_t>(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<void*>(
+ static_cast<uintptr_t>(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<const uint8_t*>(
+ 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<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()) {
+ 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<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;
+ g_debug_frames.emplace(filename, std::unique_ptr<DebugFrameInfo>(debug_frame));
}
return debug_frame;
}
@@ -556,72 +623,106 @@ static bool GetFdeTableOffsetInEhFrameHdr(const std::vector<uint8_t>& data,
return true;
}
-using ProgramHeader = DebugFrameInfo::EhFrame::ProgramHeader;
-
template <class ELFT>
DebugFrameInfo* ReadDebugFrameFromELFFile(const llvm::object::ELFFile<ELFT>* elf) {
+ DebugFrameInfo* result = new DebugFrameInfo;
+ result->text_end_vaddr = std::numeric_limits<uint64_t>::max();
+
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->section_begin(); it != elf->section_end(); ++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;
+ 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<llvm::ArrayRef<uint8_t>> data = elf->getSectionContents(&*it);
+ if (data) {
+ 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 (s == ".eh_frame") {
+ result->eh_frame.vaddr = it->sh_addr;
+ llvm::ErrorOr<llvm::ArrayRef<uint8_t>> data = elf->getSectionContents(&*it);
+ if (data) {
+ 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<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;
+ 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 (name.get() == ".eh_frame") {
- has_eh_frame = true;
- eh_frame_vaddr = it->sh_addr;
+ } else if (s == ".ARM.extab") {
+ result->arm_exidx.extab_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;
+ 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<ProgramHeader> program_headers;
+ result->min_vaddr = std::numeric_limits<uint64_t>::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);
- }
- 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 ((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;
+ }
+ }
+ }
+ 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<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;
-};
+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<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 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 <inttypes.h>
#include <libunwind.h>
#include <pthread.h>
#include <stdint.h>
@@ -9,6 +26,9 @@
#include <utility>
#include <vector>
+#include <android-base/file.h>
+#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#include <cutils/threads.h>
@@ -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<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;
+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<int(void (*)(void*), void*)>& function,
- std::vector<uintptr_t>* pc_values) {
+struct FunctionSymbol {
+ std::string name;
+ uintptr_t start;
+ uintptr_t end;
+};
+
+static std::vector<FunctionSymbol> GetFunctionSymbols() {
+ std::vector<FunctionSymbol> symbols = {
+ {"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},
+ {"test_get_context_and_wait", reinterpret_cast<uintptr_t>(&test_get_context_and_wait), 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;
+ }
+ return symbols;
+}
+
+static std::string RawDataToHexString(const void* data, size_t size) {
+ const uint8_t* p = static_cast<const uint8_t*>(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<uint8_t*>(data);
+ for (size_t i = 0; i < size; ++i) {
+ int value;
+ sscanf(s, "%02x", &value);
+ *p++ = static_cast<uint8_t>(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<OfflineThreadArg*>(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<uintptr_t>(stack);
@@ -86,18 +141,17 @@ static void OfflineBacktraceFunctionCall(const std::function<int(void (*)(void*)
ASSERT_EQ(0, pthread_attr_setstack(&attr, reinterpret_cast<void*>(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<uint8_t> stack_data(reinterpret_cast<uint8_t*>(stack),
reinterpret_cast<uint8_t*>(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<BacktraceMap> map(BacktraceMap::Create(getpid()));
ASSERT_TRUE(map != nullptr);
@@ -106,47 +160,44 @@ static void OfflineBacktraceFunctionCall(const std::function<int(void (*)(void*)
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);
+ // 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');
- ucontext_t ucontext = GetUContextFromUnwContext(arg.unw_context);
- ASSERT_TRUE(backtrace->Unwind(0, &ucontext));
+ // 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');
- // 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);
+ // 5. Dump function symbols
+ std::vector<FunctionSymbol> 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<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;
- }
- }
+static std::string FunctionNameForAddress(uintptr_t addr,
+ const std::vector<FunctionSymbol>& 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<int(void (*)(void*), void*)> 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<std::string> lines = android::base::Split(testdata, "\n");
+ int pid;
+ int tid;
+ std::vector<backtrace_map_t> maps;
+ unw_context_t unw_context;
+ backtrace_stackinfo_t stack_info;
+ std::vector<uint8_t> stack;
+ std::vector<FunctionSymbol> 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<BacktraceMap> map(BacktraceMap::Create(pid, maps));
+ ASSERT_TRUE(map != nullptr);
+
+ std::unique_ptr<Backtrace> 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<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));
+ 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<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()));
+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 <libunwind.h>
#include <stdio.h>
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
--- /dev/null
+++ b/libbacktrace/testdata/aarch64/libbacktrace_test_eh_frame.so
Binary files 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: /system/lib64/libutils.so
+map: start: 7015a99000 end: 7015b6d000 offset: 0 load_base: 9000 flags: 5 name: /system/lib64/libc++.so
+map: start: 7015b6d000 end: 7015b6e000 offset: 0 load_base: 0 flags: 0 name:
+map: start: 7015b6e000 end: 7015b76000 offset: d4000 load_base: 0 flags: 1 name: /system/lib64/libc++.so
+map: start: 7015b76000 end: 7015b77000 offset: dc000 load_base: 0 flags: 3 name: /system/lib64/libc++.so
+map: start: 7015b77000 end: 7015b7a000 offset: 0 load_base: 0 flags: 3 name: [anon:.bss]
+map: start: 7015b81000 end: 7015b92000 offset: 0 load_base: 0 flags: 5 name: /system/lib64/liblog.so
+map: start: 7015b92000 end: 7015b93000 offset: 10000 load_base: 0 flags: 1 name: /system/lib64/liblog.so
+map: start: 7015b93000 end: 7015b94000 offset: 11000 load_base: 0 flags: 3 name: /system/lib64/liblog.so
+map: start: 7015be3000 end: 7015ca3000 offset: 0 load_base: 0 flags: 5 name: /system/lib64/libc.so
+map: start: 7015ca3000 end: 7015ca9000 offset: bf000 load_base: 0 flags: 1 name: /system/lib64/libc.so
+map: start: 7015ca9000 end: 7015cab000 offset: c5000 load_base: 0 flags: 3 name: /system/lib64/libc.so
+map: start: 7015cab000 end: 7015cac000 offset: 0 load_base: 0 flags: 3 name: [anon:.bss]
+map: start: 7015cac000 end: 7015cad000 offset: 0 load_base: 0 flags: 1 name: [anon:.bss]
+map: start: 7015cad000 end: 7015cb4000 offset: 0 load_base: 0 flags: 3 name: [anon:.bss]
+map: start: 7015cf5000 end: 7015cf6000 offset: 0 load_base: 0 flags: 5 name: /data/libbacktrace_test.so
+map: start: 7015cf6000 end: 7015cf7000 offset: 0 load_base: 0 flags: 1 name: /data/libbacktrace_test.so
+map: start: 7015cf7000 end: 7015cf8000 offset: 1000 load_base: 0 flags: 3 name: /data/libbacktrace_test.so
+map: start: 7015d1f000 end: 7015d39000 offset: 0 load_base: 0 flags: 5 name: /system/lib64/libunwind.so
+map: start: 7015d39000 end: 7015d3a000 offset: 19000 load_base: 0 flags: 1 name: /system/lib64/libunwind.so
+map: start: 7015d3a000 end: 7015d3b000 offset: 1a000 load_base: 0 flags: 3 name: /system/lib64/libunwind.so
+map: start: 7015d3b000 end: 7015da4000 offset: 0 load_base: 0 flags: 3 name: [anon:.bss]
+map: start: 7015de8000 end: 7015df7000 offset: 0 load_base: 0 flags: 5 name: /system/lib64/libbase.so
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diff --git a/libbacktrace/testdata/arm/libbacktrace_test_arm_exidx.so b/libbacktrace/testdata/arm/libbacktrace_test_arm_exidx.so
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+function: start: 0 end: 7fd5abcf7930 name: unknown_start
+function: start: 7fd5abcf7930 end: 7fd5abcf7990 name: test_level_four
+function: start: 7fd5abcf7990 end: 7fd5abcf79f0 name: test_level_three
+function: start: 7fd5abcf79f0 end: 7fd5abcf7a50 name: test_level_two
+function: start: 7fd5abcf7a50 end: 7fd5abcf7ab0 name: test_level_one
+function: start: 7fd5abcf7ab0 end: 7fd5abcf7b30 name: test_recursive_call
+function: start: 7fd5abcf7b30 end: ffffffffffffffff name: test_get_context_and_wait
+function: start: ffffffffffffffff end: ffffffffffffffff name: unknown_end