140 lines
4.5 KiB
C++
140 lines
4.5 KiB
C++
/*
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* Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/LexicalPath.h>
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#include <AK/MappedFile.h>
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#include <AK/Platform.h>
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#include <AK/StringBuilder.h>
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#include <AK/Types.h>
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#include <LibCore/File.h>
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#include <LibCoreDump/Backtrace.h>
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#include <LibCoreDump/Reader.h>
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#include <LibELF/CoreDump.h>
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#include <LibELF/Image.h>
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namespace CoreDump {
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ELFObjectInfo const* Backtrace::object_info_for_region(ELF::Core::MemoryRegionInfo const& region)
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{
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auto path = region.object_name();
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if (!path.starts_with('/') && path.ends_with(".so"sv))
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path = LexicalPath::join("/usr/lib", path).string();
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auto maybe_ptr = m_debug_info_cache.get(path);
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if (maybe_ptr.has_value())
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return *maybe_ptr;
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if (!Core::File::exists(path))
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return nullptr;
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auto file_or_error = MappedFile::map(path);
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if (file_or_error.is_error())
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return nullptr;
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auto image = make<ELF::Image>(file_or_error.value()->bytes());
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auto& image_reference = *image;
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auto info = make<ELFObjectInfo>(file_or_error.release_value(), make<Debug::DebugInfo>(image_reference), move(image));
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auto* info_ptr = info.ptr();
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m_debug_info_cache.set(path, move(info));
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return info_ptr;
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}
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Backtrace::Backtrace(const Reader& coredump, const ELF::Core::ThreadInfo& thread_info)
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: m_thread_info(move(thread_info))
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{
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FlatPtr* bp;
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FlatPtr* ip;
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#if ARCH(I386)
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bp = (FlatPtr*)m_thread_info.regs.ebp;
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ip = (FlatPtr*)m_thread_info.regs.eip;
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#else
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bp = (FlatPtr*)m_thread_info.regs.rbp;
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ip = (FlatPtr*)m_thread_info.regs.rip;
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#endif
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bool first_frame = true;
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while (bp && ip) {
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// We use eip - 1 because the return address from a function frame
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// is the instruction that comes after the 'call' instruction.
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// However, because the first frame represents the faulting
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// instruction rather than the return address we don't subtract
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// 1 there.
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VERIFY((FlatPtr)ip > 0);
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add_entry(coredump, (FlatPtr)ip - (first_frame ? 0 : 1));
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first_frame = false;
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auto next_ip = coredump.peek_memory((FlatPtr)(bp + 1));
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auto next_bp = coredump.peek_memory((FlatPtr)(bp));
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if (!next_ip.has_value() || !next_bp.has_value())
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break;
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ip = (FlatPtr*)next_ip.value();
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bp = (FlatPtr*)next_bp.value();
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}
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}
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Backtrace::~Backtrace()
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{
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}
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void Backtrace::add_entry(const Reader& coredump, FlatPtr ip)
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{
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auto* ip_region = coredump.region_containing((FlatPtr)ip);
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if (!ip_region) {
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m_entries.append({ ip, {}, {}, {} });
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return;
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}
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auto object_name = ip_region->object_name();
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if (object_name == "Loader.so")
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return;
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// We need to find the first region for the object, just in case
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// the PT_LOAD header for the .text segment isn't the first one
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// in the object file.
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auto region = coredump.first_region_for_object(object_name);
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auto* object_info = object_info_for_region(*region);
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if (!object_info)
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return;
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auto function_name = object_info->debug_info->elf().symbolicate(ip - region->region_start);
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auto source_position = object_info->debug_info->get_source_position_with_inlines(ip - region->region_start);
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m_entries.append({ ip, object_name, function_name, source_position });
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}
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String Backtrace::Entry::to_string(bool color) const
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{
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StringBuilder builder;
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builder.appendff("{:p}: ", eip);
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if (object_name.is_empty()) {
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builder.append("???");
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return builder.build();
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}
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builder.appendff("[{}] {}", object_name, function_name.is_empty() ? "???" : function_name);
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builder.append(" (");
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Vector<Debug::DebugInfo::SourcePosition> source_positions;
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for (auto& position : source_position_with_inlines.inline_chain) {
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if (!source_positions.contains_slow(position))
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source_positions.append(position);
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}
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if (source_position_with_inlines.source_position.has_value() && !source_positions.contains_slow(source_position_with_inlines.source_position.value())) {
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source_positions.insert(0, source_position_with_inlines.source_position.value());
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}
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for (size_t i = 0; i < source_positions.size(); ++i) {
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auto& position = source_positions[i];
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auto fmt = color ? "\033[34;1m{}\033[0m:{}" : "{}:{}";
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builder.appendff(fmt, LexicalPath::basename(position.file_path), position.line_number);
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if (i != source_positions.size() - 1) {
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builder.append(" => ");
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}
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}
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builder.append(")");
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return builder.build();
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}
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}
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