libbacktraceoffline: choose correct debug section for a given address.
1. In /system/lib/libart.so, the ranges of functions covered by .eh_frame
and .ARM.exidx overlap with each other. Currently, we don't check .eh_frame
if the address is in the ranges of functions covered by .ARM.exidx. It leads
to a wrong unwinding result. So change the logic to first try .eh_frame and
.debug_frame, if it fails, then try .ARM.exidx.
2. Add test for Item 1.
Bug: http://b/35251937
Test: run backtrace_test.
Change-Id: Ic412705617c300bc69b4ece178cc2e1bb3eb765b
diff --git a/libbacktrace/BacktraceOffline.cpp b/libbacktrace/BacktraceOffline.cpp
index 5e54328..53ea796 100644
--- a/libbacktrace/BacktraceOffline.cpp
+++ b/libbacktrace/BacktraceOffline.cpp
@@ -21,6 +21,7 @@
#include <dwarf.h>
}
+#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
@@ -282,39 +283,14 @@
// 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;
- }
- }
- }
-
+ // The unwind info can come from .ARM.exidx or .eh_frame, or .debug_frame/.gnu_debugdata.
+ // First check .eh_frame/.debug_frame, then check .ARM.exidx. Because .eh_frame/.debug_frame has
+ // function range for each entry, by matching ip address with the function range, we know exactly
+ // whether the ip address hits an entry. But .ARM.exidx doesn't have function range for each
+ // entry, it thinks that an ip address hits an entry when (entry.addr <= ip < next_entry.addr).
+ // To prevent ip addresses hit in .eh_frame/.debug_frame being regarded as addresses hit in
+ // .ARM.exidx, we need to check .eh_frame/.debug_frame first.
if (debug_frame->has_eh_frame) {
if (ip_vaddr >= debug_frame->eh_frame.min_func_vaddr &&
ip_vaddr < debug_frame->text_end_vaddr) {
@@ -323,7 +299,6 @@
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();
@@ -345,7 +320,6 @@
}
}
}
-
if (debug_frame->has_debug_frame || debug_frame->has_gnu_debugdata) {
unw_dyn_info_t di;
unw_word_t segbase = map.start - map.offset;
@@ -359,6 +333,40 @@
}
}
}
+
+ 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->start_ip = *it;
+ 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));
+ eh_frame_hdr_space_.Clear();
+ eh_frame_space_.Clear();
+ // 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;
+ }
+ }
+ }
return false;
}
@@ -560,7 +568,7 @@
}
DebugFrameInfo* debug_frame = ReadDebugFrameFromFile(filename);
if (cache_file_) {
- g_debug_frames.emplace(filename, std::unique_ptr<DebugFrameInfo>(debug_frame));
+ g_debug_frames.emplace(filename, std::unique_ptr<DebugFrameInfo>(debug_frame));
}
return debug_frame;
}
diff --git a/libbacktrace/backtrace_offline_test.cpp b/libbacktrace/backtrace_offline_test.cpp
index 49fcb29..465b3f9 100644
--- a/libbacktrace/backtrace_offline_test.cpp
+++ b/libbacktrace/backtrace_offline_test.cpp
@@ -220,25 +220,7 @@
#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");
+struct OfflineTestData {
int pid;
int tid;
std::vector<backtrace_map_t> maps;
@@ -246,63 +228,93 @@
backtrace_stackinfo_t stack_info;
std::vector<uint8_t> stack;
std::vector<FunctionSymbol> symbols;
+};
+
+bool ReadOfflineTestData(const std::string offline_testdata_path, OfflineTestData* testdata) {
+ std::string s;
+ if (!android::base::ReadFileToString(offline_testdata_path, &s)) {
+ return false;
+ }
+ // Parse offline_testdata.
+ std::vector<std::string> lines = android::base::Split(s, "\n");
+ memset(&testdata->unw_context, 0, sizeof(testdata->unw_context));
for (const auto& line : lines) {
if (android::base::StartsWith(line, "pid:")) {
- sscanf(line.c_str(), "pid: %d tid: %d", &pid, &tid);
+ sscanf(line.c_str(), "pid: %d tid: %d", &testdata->pid, &testdata->tid);
} else if (android::base::StartsWith(line, "map:")) {
- maps.resize(maps.size() + 1);
+ testdata->maps.resize(testdata->maps.size() + 1);
+ backtrace_map_t& map = testdata->maps.back();
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));
+ &map.start, &map.end, &map.offset, &map.load_base, &map.flags, &pos);
+ map.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);
+ if (sizeof(testdata->unw_context) != size) {
+ return false;
+ }
+ HexStringToRawData(&line[pos], &testdata->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();
+ &testdata->stack_info.start, &testdata->stack_info.end, &size, &pos);
+ testdata->stack.resize(size);
+ HexStringToRawData(&line[pos], &testdata->stack[0], size);
+ testdata->stack_info.data = testdata->stack.data();
} else if (android::base::StartsWith(line, "function:")) {
- symbols.resize(symbols.size() + 1);
+ testdata->symbols.resize(testdata->symbols.size() + 1);
+ FunctionSymbol& symbol = testdata->symbols.back();
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);
+ &symbol.start, &symbol.end, &pos);
+ symbol.name = line.substr(pos);
}
}
+ return true;
+}
+
+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 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;
+ }
+
+ const std::string offline_testdata_path = "testdata/" + arch + "/offline_testdata";
+ OfflineTestData testdata;
+ ASSERT_TRUE(ReadOfflineTestData(offline_testdata_path, &testdata));
// Fix path of libbacktrace_testlib.so.
- for (auto& map : maps) {
+ for (auto& map : testdata.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));
+ std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(testdata.pid, testdata.maps));
ASSERT_TRUE(map != nullptr);
std::unique_ptr<Backtrace> backtrace(
- Backtrace::CreateOffline(pid, tid, map.get(), stack_info));
+ Backtrace::CreateOffline(testdata.pid, testdata.tid, map.get(), testdata.stack_info));
ASSERT_TRUE(backtrace != nullptr);
- ucontext_t ucontext = GetUContextFromUnwContext(unw_context);
+ ucontext_t ucontext = GetUContextFromUnwContext(testdata.unw_context);
ASSERT_TRUE(backtrace->Unwind(0, &ucontext));
-
// Collect pc values of the call stack frames.
std::vector<uintptr_t> pc_values;
for (size_t i = 0; i < backtrace->NumFrames(); ++i) {
@@ -311,17 +323,20 @@
size_t test_one_index = 0;
for (size_t i = 0; i < pc_values.size(); ++i) {
- if (FunctionNameForAddress(pc_values[i], symbols) == "test_level_one") {
+ if (FunctionNameForAddress(pc_values[i], testdata.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], 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));
+ ASSERT_EQ("test_level_one", FunctionNameForAddress(pc_values[test_one_index], testdata.symbols));
+ ASSERT_EQ("test_level_two", FunctionNameForAddress(pc_values[test_one_index - 1],
+ testdata.symbols));
+ ASSERT_EQ("test_level_three", FunctionNameForAddress(pc_values[test_one_index - 2],
+ testdata.symbols));
+ ASSERT_EQ("test_level_four", FunctionNameForAddress(pc_values[test_one_index - 3],
+ testdata.symbols));
}
TEST(libbacktrace, offline_eh_frame) {
@@ -339,3 +354,47 @@
TEST(libbacktrace, offline_arm_exidx) {
BacktraceOfflineTest("libbacktrace_test_arm_exidx.so");
}
+
+// This test tests the situation that ranges of functions covered by .eh_frame and .ARM.exidx
+// overlap with each other, which appears in /system/lib/libart.so.
+TEST(libbacktrace, offline_unwind_mix_eh_frame_and_arm_exidx) {
+ const std::string arch = GetArch();
+ if (arch.empty() || arch != "arm") {
+ GTEST_LOG_(INFO) << "This test does nothing on current arch.";
+ return;
+ }
+ const std::string testlib_path = "testdata/" + arch + "/libart.so";
+ struct stat st;
+ ASSERT_EQ(0, stat(testlib_path.c_str(), &st)) << "can't find testlib " << testlib_path;
+
+ const std::string offline_testdata_path = "testdata/" + arch + "/offline_testdata_for_libart";
+ OfflineTestData testdata;
+ ASSERT_TRUE(ReadOfflineTestData(offline_testdata_path, &testdata));
+
+ // Fix path of /system/lib/libart.so.
+ for (auto& map : testdata.maps) {
+ if (map.name.find("libart.so") != std::string::npos) {
+ map.name = testlib_path;
+ }
+ }
+
+ // Do offline backtrace.
+ std::unique_ptr<BacktraceMap> map(BacktraceMap::Create(testdata.pid, testdata.maps));
+ ASSERT_TRUE(map != nullptr);
+
+ std::unique_ptr<Backtrace> backtrace(
+ Backtrace::CreateOffline(testdata.pid, testdata.tid, map.get(), testdata.stack_info));
+ ASSERT_TRUE(backtrace != nullptr);
+
+ ucontext_t ucontext = GetUContextFromUnwContext(testdata.unw_context);
+ ASSERT_TRUE(backtrace->Unwind(0, &ucontext));
+
+ // The last frame is outside of libart.so
+ ASSERT_EQ(testdata.symbols.size() + 1, backtrace->NumFrames());
+ for (size_t i = 0; i + 1 < backtrace->NumFrames(); ++i) {
+ uintptr_t vaddr_in_file = backtrace->GetFrame(i)->pc - testdata.maps[0].start +
+ testdata.maps[0].load_base;
+ std::string name = FunctionNameForAddress(vaddr_in_file, testdata.symbols);
+ ASSERT_EQ(name, testdata.symbols[i].name);
+ }
+}
diff --git a/libbacktrace/testdata/arm/libart.so b/libbacktrace/testdata/arm/libart.so
new file mode 100644
index 0000000..bed8e35
--- /dev/null
+++ b/libbacktrace/testdata/arm/libart.so
Binary files differ
diff --git a/libbacktrace/testdata/arm/offline_testdata_for_libart b/libbacktrace/testdata/arm/offline_testdata_for_libart
new file mode 100644
index 0000000..63f6a07
--- /dev/null
+++ b/libbacktrace/testdata/arm/offline_testdata_for_libart
@@ -0,0 +1,10 @@
+pid: 32232 tid: 32233
+registers: 64 000000000000000000000000000000006473602451b3e2e700000000d82fd1ff5600000000908eec00000000d42dd1ff00000000c02dd1ff617171e9617171e9
+map: start: e9380000 end: e9766000 offset: 0 load_base: b000 flags: 5 name: /system/lib/libart.so
+stack: start: ffd12dc0 end: ffd16000 size: 12864 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+function: start: 3a2121 end: 3a217a name: art_quick_invoke_stub_internal
+function: start: 3a66a5 end: 3a6787 name: art_quick_invoke_static_stub
+function: start: a7129 end: a72f1 name: art::ArtMethod::Invoke(art::Thread*, unsigned int*, unsigned int, art::JValue*, char const*)
+function: start: 2fbd35 end: 2fc789 name: art::InvokeWithArgArray(art::ScopedObjectAccessAlreadyRunnable const&, art::ArtMethod*, art::ArgArray*, art::JValue*, char const*)
+function: start: 2fcf75 end: 2fd88d name: art::InvokeMethod(art::ScopedObjectAccessAlreadyRunnable const&, _jobject*, _jobject*, _jobject*, unsigned int)
+function: start: 2a089d end: 2a08bb name: art::Method_invoke(_JNIEnv*, _jobject*, _jobject*, _jobject*)
\ No newline at end of file