Merge "Implement support for linker rosegment option." (bca82de1) · Commits · e / os / android_system_core

libbacktrace/Android.bp

+0 −4

Original line number	Diff line number	Diff line
		@@ -116,10 +116,6 @@ cc_test_library {

		target: {
		linux_glibc: {
		// The host uses rosegment, which isn't supported yet.
		ldflags: [
		"-Wl,--no-rosegment",
		],
		// This forces the creation of eh_frame with unwind information
		// for host.
		cflags: [

libunwindstack/Android.bp

+2 −0

Original line number	Diff line number	Diff line
		@@ -178,6 +178,7 @@ cc_test {
		"tests/JitDebugTest.cpp",
		"tests/LocalUnwinderTest.cpp",
		"tests/LogFake.cpp",
		"tests/MapInfoCreateMemoryTest.cpp",
		"tests/MapInfoGetElfTest.cpp",
		"tests/MapInfoGetLoadBiasTest.cpp",
		"tests/MapsTest.cpp",
		@@ -188,6 +189,7 @@ cc_test {
		"tests/MemoryOfflineBufferTest.cpp",
		"tests/MemoryOfflineTest.cpp",
		"tests/MemoryRangeTest.cpp",
		"tests/MemoryRangesTest.cpp",
		"tests/MemoryRemoteTest.cpp",
		"tests/MemoryTest.cpp",
		"tests/RegsInfoTest.cpp",

libunwindstack/MapInfo.cpp

+48 −1

Original line number	Diff line number	Diff line
		@@ -102,7 +102,54 @@ Memory* MapInfo::CreateMemory(const std::shared_ptr<Memory>& process_memory) {
		if (!(flags & PROT_READ)) {
		return nullptr;
		}
		return new MemoryRange(process_memory, start, end - start, 0);

		// Need to verify that this elf is valid. It's possible that
		// only part of the elf file to be mapped into memory is in the executable
		// map. In this case, there will be another read-only map that includes the
		// first part of the elf file. This is done if the linker rosegment
		// option is used.
		std::unique_ptr<MemoryRange> memory(new MemoryRange(process_memory, start, end - start, 0));
		bool valid;
		uint64_t max_size;
		Elf::GetInfo(memory.get(), &valid, &max_size);
		if (valid) {
		// Valid elf, we are done.
		return memory.release();
		}

		if (name.empty() \|\| maps_ == nullptr) {
		return nullptr;
		}

		// Find the read-only map that has the same name and has an offset closest
		// to the current offset but less than the offset of the current map.
		// For shared libraries, there should be a r-x map that has a non-zero
		// offset and then a r-- map that has a zero offset.
		// For shared libraries loaded from an apk, there should be a r-x map that
		// has a non-zero offset and then a r-- map that has a non-zero offset less
		// than the offset from the r-x map.
		uint64_t closest_offset = 0;
		MapInfo* ro_map_info = nullptr;
		for (auto map_info : *maps_) {
		if (map_info->flags == PROT_READ && map_info->name == name && map_info->offset < offset &&
		map_info->offset >= closest_offset) {
		ro_map_info = map_info;
		closest_offset = ro_map_info->offset;
		}
		}

		if (ro_map_info != nullptr) {
		// Make sure that relative pc values are corrected properly.
		elf_offset = offset - closest_offset;

		MemoryRanges* ranges = new MemoryRanges;
		ranges->Insert(new MemoryRange(process_memory, ro_map_info->start,
		ro_map_info->end - ro_map_info->start, 0));
		ranges->Insert(new MemoryRange(process_memory, start, end - start, elf_offset));

		return ranges;
		}
		return nullptr;
		}

		Elf* MapInfo::GetElf(const std::shared_ptr<Memory>& process_memory, bool init_gnu_debugdata) {

libunwindstack/Maps.cpp

+3 −3

Original line number	Diff line number	Diff line
		@@ -66,13 +66,13 @@ bool Maps::Parse() {
		if (strncmp(name, "/dev/", 5) == 0 && strncmp(name + 5, "ashmem/", 7) != 0) {
		flags \|= unwindstack::MAPS_FLAGS_DEVICE_MAP;
		}
		maps_.push_back(new MapInfo(start, end, pgoff, flags, name));
		maps_.push_back(new MapInfo(this, start, end, pgoff, flags, name));
		});
		}

		void Maps::Add(uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
		const std::string& name, uint64_t load_bias) {
		MapInfo* map_info = new MapInfo(start, end, offset, flags, name);
		MapInfo* map_info = new MapInfo(this, start, end, offset, flags, name);
		map_info->load_bias = load_bias;
		maps_.push_back(map_info);
		}
		@@ -97,7 +97,7 @@ bool BufferMaps::Parse() {
		if (strncmp(name, "/dev/", 5) == 0 && strncmp(name + 5, "ashmem/", 7) != 0) {
		flags \|= unwindstack::MAPS_FLAGS_DEVICE_MAP;
		}
		maps_.push_back(new MapInfo(start, end, pgoff, flags, name));
		maps_.push_back(new MapInfo(this, start, end, pgoff, flags, name));
		});
		}

libunwindstack/Memory.cpp

+12 −0

Original line number	Diff line number	Diff line
		@@ -316,6 +316,18 @@ size_t MemoryRange::Read(uint64_t addr, void* dst, size_t size) {
		return memory_->Read(read_addr, dst, read_length);
		}

		void MemoryRanges::Insert(MemoryRange* memory) {
		maps_.emplace(memory->offset() + memory->length(), memory);
		}

		size_t MemoryRanges::Read(uint64_t addr, void* dst, size_t size) {
		auto entry = maps_.upper_bound(addr);
		if (entry != maps_.end()) {
		return entry->second->Read(addr, dst, size);
		}
		return 0;
		}

		bool MemoryOffline::Init(const std::string& file, uint64_t offset) {
		auto memory_file = std::make_shared<MemoryFileAtOffset>();
		if (!memory_file->Init(file, offset)) {