106 lines
3.4 KiB
C++
106 lines
3.4 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/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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// FIXME: This cache has to be invalidated when libraries/programs are re-compiled.
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// We can store the last-modified timestamp of the elf files in ELFObjectInfo to invalidate cache entries.
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static HashMap<String, NonnullOwnPtr<ELFObjectInfo>> s_debug_info_cache;
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static const ELFObjectInfo* object_info_for_region(const ELF::Core::MemoryRegionInfo& region)
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{
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auto name = region.object_name();
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String path;
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if (name.contains(".so"))
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path = String::formatted("/usr/lib/{}", name);
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else {
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path = name;
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}
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if (auto it = s_debug_info_cache.find(path); it != s_debug_info_cache.end())
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return it->value.ptr();
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if (!Core::File::exists(path.characters()))
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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 info = make<ELFObjectInfo>(file_or_error.release_value(), Debug::DebugInfo { move(image) });
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auto* info_ptr = info.ptr();
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s_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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uint32_t* ebp = (uint32_t*)m_thread_info.regs.ebp;
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uint32_t* eip = (uint32_t*)m_thread_info.regs.eip;
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while (ebp && eip) {
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add_entry(coredump, (FlatPtr)eip);
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auto next_eip = coredump.peek_memory((FlatPtr)(ebp + 1));
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auto next_ebp = coredump.peek_memory((FlatPtr)(ebp));
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if (!next_eip.has_value() || !next_ebp.has_value())
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break;
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eip = (uint32_t*)next_eip.value();
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ebp = (uint32_t*)next_ebp.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 eip)
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{
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auto* region = coredump.region_containing((FlatPtr)eip);
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if (!region) {
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m_entries.append({ eip, {}, {}, {} });
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return;
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}
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auto object_name = region->object_name();
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if (object_name == "Loader.so")
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return;
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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(eip - region->region_start);
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auto source_position = object_info->debug_info.get_source_position(eip - region->region_start);
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m_entries.append({ eip, 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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if (source_position.has_value()) {
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auto& source_position = this->source_position.value();
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auto fmt = color ? " (\033[34;1m{}\033[0m:{})" : " ({}:{})";
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builder.appendff(fmt, LexicalPath(source_position.file_path).basename(), source_position.line_number);
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}
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return builder.build();
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}
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}
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