2939ad0110
Creating a backtrace from a crashdump already existed as a few standalone functions in CrashDaemon. This patch refactors the code required for this to make it generally usable and moves it to CoreDump::Backtrace, which provides both raw data as well as stringification.
129 lines
4.4 KiB
C++
129 lines
4.4 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibCoreDump/Backtrace.h>
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#include <LibCoreDump/Reader.h>
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#include <string.h>
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namespace CoreDump {
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OwnPtr<Reader> Reader::create(const String& path)
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{
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auto mapped_file = make<MappedFile>(path);
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if (!mapped_file->is_valid())
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return nullptr;
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return make<Reader>(move(mapped_file));
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}
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Reader::Reader(OwnPtr<MappedFile>&& coredump_file)
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: m_coredump_file(move(coredump_file))
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, m_coredump_image((u8*)m_coredump_file->data(), m_coredump_file->size())
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{
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size_t index = 0;
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m_coredump_image.for_each_program_header([this, &index](auto pheader) {
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if (pheader.type() == PT_NOTE) {
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m_notes_segment_index = index;
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return IterationDecision::Break;
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}
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++index;
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return IterationDecision::Continue;
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});
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ASSERT(m_notes_segment_index != -1);
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}
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Reader::~Reader()
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{
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}
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Reader::NotesEntryIterator::NotesEntryIterator(const u8* notes_data)
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: m_current((const ELF::Core::NotesEntry*)notes_data)
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, start(notes_data)
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{
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}
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ELF::Core::NotesEntryHeader::Type Reader::NotesEntryIterator::type() const
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{
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ASSERT(m_current->header.type == ELF::Core::NotesEntryHeader::Type::MemoryRegionInfo
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|| m_current->header.type == ELF::Core::NotesEntryHeader::Type::ThreadInfo
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|| m_current->header.type == ELF::Core::NotesEntryHeader::Type::Null);
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return m_current->header.type;
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}
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const ELF::Core::NotesEntry* Reader::NotesEntryIterator::current() const
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{
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return m_current;
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}
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void Reader::NotesEntryIterator::next()
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{
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ASSERT(!at_end());
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if (type() == ELF::Core::NotesEntryHeader::Type::ThreadInfo) {
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const ELF::Core::ThreadInfo* current = (const ELF::Core::ThreadInfo*)m_current;
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m_current = (const ELF::Core::NotesEntry*)(current + 1);
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return;
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}
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if (type() == ELF::Core::NotesEntryHeader::Type::MemoryRegionInfo) {
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const ELF::Core::MemoryRegionInfo* current = (const ELF::Core::MemoryRegionInfo*)m_current;
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m_current = (const ELF::Core::NotesEntry*)(current->region_name + strlen(current->region_name) + 1);
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return;
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}
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}
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bool Reader::NotesEntryIterator::at_end() const
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{
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return type() == ELF::Core::NotesEntryHeader::Type::Null;
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}
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Optional<uint32_t> Reader::peek_memory(FlatPtr address) const
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{
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const auto* region = region_containing(address);
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if (!region)
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return {};
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FlatPtr offset_in_region = address - region->region_start;
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const char* region_data = image().program_header(region->program_header_index).raw_data();
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return *(const uint32_t*)(®ion_data[offset_in_region]);
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}
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const ELF::Core::MemoryRegionInfo* Reader::region_containing(FlatPtr address) const
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{
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const ELF::Core::MemoryRegionInfo* ret = nullptr;
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for_each_memory_region_info([&ret, address](const ELF::Core::MemoryRegionInfo& region_info) {
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if (region_info.region_start <= address && region_info.region_end >= address) {
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ret = ®ion_info;
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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return ret;
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}
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Backtrace Reader::backtrace() const
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{
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return Backtrace(*this);
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}
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}
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