mirror of
https://github.com/SerenityOS/serenity.git
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1e4c010643
This commit gets rid of ELF::Loader entirely since its very ambiguous purpose was actually to load executables for the kernel, and that is now handled by the kernel itself. This patch includes some drive-by cleanup in LibDebug and CrashDaemon enabled by the fact that we no longer need to keep the ref-counted ELF::Loader around.
178 lines
6.3 KiB
C++
178 lines
6.3 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 <AK/Assertions.h>
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#include <AK/HashMap.h>
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#include <AK/LexicalPath.h>
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#include <AK/LogStream.h>
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#include <AK/ScopeGuard.h>
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#include <LibCore/DirectoryWatcher.h>
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#include <LibCore/File.h>
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#include <LibCoreDump/CoreDumpReader.h>
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#include <LibDebug/DebugInfo.h>
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#include <LibELF/Image.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <time.h>
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#include <unistd.h>
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static void wait_until_coredump_is_ready(const String& coredump_path)
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{
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while (true) {
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struct stat statbuf;
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if (stat(coredump_path.characters(), &statbuf) < 0) {
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perror("stat");
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ASSERT_NOT_REACHED();
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}
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if (statbuf.st_mode & 0400) // Check if readable
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break;
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usleep(10000); // sleep for 10ms
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}
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}
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static String object_name(StringView memory_region_name)
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{
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if (memory_region_name.contains("Loader.so"))
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return "Loader.so";
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if (!memory_region_name.contains(":"))
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return {};
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return memory_region_name.substring_view(0, memory_region_name.find_first_of(":").value()).to_string();
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}
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struct ElfObjectInfo {
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ElfObjectInfo(MappedFile&& file, Debug::DebugInfo&& debug_info)
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: file(move(file))
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, debug_info(move(debug_info))
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{
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}
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MappedFile file;
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Debug::DebugInfo debug_info;
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};
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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 = object_name(region->region_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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MappedFile object_file(path);
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if (!object_file.is_valid())
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return nullptr;
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auto info = make<ElfObjectInfo>(move(object_file), Debug::DebugInfo { make<ELF::Image>((const u8*)object_file.data(), object_file.size()) });
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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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static String backtrace_line(const CoreDumpReader& 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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return String::format("%p: ???", eip);
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if (StringView { region->region_name }.contains("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 func_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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auto source_position_string = String::empty();
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if (source_position.has_value())
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source_position_string = String::format(" (\033[34;1m%s\033[0m:%u)", LexicalPath(source_position.value().file_path).basename().characters(), source_position.value().line_number);
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return String::format("%p: [%s] %s%s", eip, object_name(region->region_name).characters(), func_name.is_null() ? "???" : func_name.characters(), source_position_string.characters());
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}
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static void backtrace(const String& coredump_path)
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{
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size_t thread_index = 0;
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auto coredump = CoreDumpReader::create(coredump_path);
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coredump->for_each_thread_info([&thread_index, &coredump](const ELF::Core::ThreadInfo* thread_info) {
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dbgln("Backtrace for thread #{}, tid={}", thread_index++, thread_info->tid);
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uint32_t* ebp = (uint32_t*)thread_info->regs.ebp;
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uint32_t* eip = (uint32_t*)thread_info->regs.eip;
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while (ebp && eip) {
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auto line = backtrace_line(*coredump, (FlatPtr)eip);
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if (!line.is_null())
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dbgprintf("%s\n", line.characters());
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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_ebp.has_value() || !next_eip.has_value()) {
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break;
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}
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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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return IterationDecision::Continue;
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});
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}
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int main()
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{
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static constexpr const char* coredumps_dir = "/tmp/coredump";
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mkdir(coredumps_dir, 0777);
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Core::DirectoryWatcher watcher { coredumps_dir };
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while (true) {
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auto event = watcher.wait_for_event();
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ASSERT(event.has_value());
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if (event.value().type != Core::DirectoryWatcher::Event::Type::ChildAdded)
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continue;
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auto coredump_path = event.value().child_path;
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dbgln("New coredump file: {}", coredump_path);
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wait_until_coredump_is_ready(coredump_path);
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backtrace(coredump_path);
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}
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}
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