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/*
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/LexicalPath.h>
#include <AK/MappedFile.h>
#include <AK/StringBuilder.h>
#include <AK/Types.h>
#include <LibCore/File.h>
#include <LibCoreDump/Backtrace.h>
#include <LibCoreDump/Reader.h>
#include <LibELF/CoreDump.h>
#include <LibELF/Image.h>
namespace CoreDump {
// FIXME: This cache has to be invalidated when libraries/programs are re-compiled.
// We can store the last-modified timestamp of the elf files in ELFObjectInfo to invalidate cache entries.
static HashMap<String, NonnullOwnPtr<ELFObjectInfo>> s_debug_info_cache;
static const ELFObjectInfo* object_info_for_region(const ELF::Core::MemoryRegionInfo& region)
{
auto name = region.object_name();
String path;
if (name.contains(".so"))
path = String::formatted("/usr/lib/{}", name);
else {
path = name;
}
if (auto it = s_debug_info_cache.find(path); it != s_debug_info_cache.end())
return it->value.ptr();
if (!Core::File::exists(path.characters()))
return nullptr;
auto file_or_error = MappedFile::map(path);
if (file_or_error.is_error())
return nullptr;
auto image = make<ELF::Image>(file_or_error.value()->bytes());
auto info = make<ELFObjectInfo>(file_or_error.release_value(), Debug::DebugInfo { move(image) });
auto* info_ptr = info.ptr();
s_debug_info_cache.set(path, move(info));
return info_ptr;
}
Backtrace::Backtrace(const Reader& coredump, const ELF::Core::ThreadInfo& thread_info)
: m_thread_info(move(thread_info))
{
uint32_t* ebp = (uint32_t*)m_thread_info.regs.ebp;
uint32_t* eip = (uint32_t*)m_thread_info.regs.eip;
while (ebp && eip) {
add_entry(coredump, (FlatPtr)eip);
auto next_eip = coredump.peek_memory((FlatPtr)(ebp + 1));
auto next_ebp = coredump.peek_memory((FlatPtr)(ebp));
if (!next_eip.has_value() || !next_ebp.has_value())
break;
eip = (uint32_t*)next_eip.value();
ebp = (uint32_t*)next_ebp.value();
}
}
Backtrace::~Backtrace()
{
}
void Backtrace::add_entry(const Reader& coredump, FlatPtr eip)
{
auto* region = coredump.region_containing((FlatPtr)eip);
if (!region) {
m_entries.append({ eip, {}, {}, {} });
return;
}
auto object_name = region->object_name();
if (object_name == "Loader.so")
return;
auto* object_info = object_info_for_region(*region);
if (!object_info)
return;
auto function_name = object_info->debug_info.elf().symbolicate(eip - region->region_start);
auto source_position = object_info->debug_info.get_source_position(eip - region->region_start);
m_entries.append({ eip, object_name, function_name, source_position });
}
String Backtrace::Entry::to_string(bool color) const
{
StringBuilder builder;
builder.appendff("{:p}: ", eip);
if (object_name.is_empty()) {
builder.append("???");
return builder.build();
}
builder.appendff("[{}] {}", object_name, function_name.is_empty() ? "???" : function_name);
if (source_position.has_value()) {
auto& source_position = this->source_position.value();
auto fmt = color ? " (\033[34;1m{}\033[0m:{})" : " ({}:{})";
builder.appendff(fmt, LexicalPath(source_position.file_path).basename(), source_position.line_number);
}
return builder.build();
}
}
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