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https://github.com/yuzu-mirror/yuzu
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5a7eecc3ad
Certain newer unity games (Terraria, Pokemon Mystery Dungeon) require that the argument region be populated. Failure to do so results in an integer underflow in argument count, and eventually an unmapped read at 0x800000000. Providing this default fixes this. Note that the behavior of official software is as yet unverified, arguments-wise.
203 lines
7.5 KiB
C++
203 lines
7.5 KiB
C++
// Copyright 2018 yuzu emulator team
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cinttypes>
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#include <cstring>
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#include <vector>
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#include "common/common_funcs.h"
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#include "common/file_util.h"
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#include "common/hex_util.h"
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#include "common/logging/log.h"
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#include "common/lz4_compression.h"
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#include "common/swap.h"
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#include "core/core.h"
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#include "core/file_sys/patch_manager.h"
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#include "core/gdbstub/gdbstub.h"
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#include "core/hle/kernel/code_set.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/vm_manager.h"
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#include "core/loader/nso.h"
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#include "core/memory.h"
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#include "core/settings.h"
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namespace Loader {
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namespace {
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struct MODHeader {
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u32_le magic;
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u32_le dynamic_offset;
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u32_le bss_start_offset;
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u32_le bss_end_offset;
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u32_le eh_frame_hdr_start_offset;
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u32_le eh_frame_hdr_end_offset;
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u32_le module_offset; // Offset to runtime-generated module object. typically equal to .bss base
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};
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static_assert(sizeof(MODHeader) == 0x1c, "MODHeader has incorrect size.");
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std::vector<u8> DecompressSegment(const std::vector<u8>& compressed_data,
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const NSOSegmentHeader& header) {
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const std::vector<u8> uncompressed_data =
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Common::Compression::DecompressDataLZ4(compressed_data, header.size);
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ASSERT_MSG(uncompressed_data.size() == header.size, "{} != {}", header.size,
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uncompressed_data.size());
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return uncompressed_data;
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}
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constexpr u32 PageAlignSize(u32 size) {
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return (size + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
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}
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} // Anonymous namespace
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bool NSOHeader::IsSegmentCompressed(size_t segment_num) const {
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ASSERT_MSG(segment_num < 3, "Invalid segment {}", segment_num);
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return ((flags >> segment_num) & 1) != 0;
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}
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AppLoader_NSO::AppLoader_NSO(FileSys::VirtualFile file) : AppLoader(std::move(file)) {}
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FileType AppLoader_NSO::IdentifyType(const FileSys::VirtualFile& file) {
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u32 magic = 0;
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if (file->ReadObject(&magic) != sizeof(magic)) {
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return FileType::Error;
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}
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if (Common::MakeMagic('N', 'S', 'O', '0') != magic) {
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return FileType::Error;
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}
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return FileType::NSO;
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}
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std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::Process& process,
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const FileSys::VfsFile& file, VAddr load_base,
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bool should_pass_arguments,
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std::optional<FileSys::PatchManager> pm) {
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if (file.GetSize() < sizeof(NSOHeader)) {
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return {};
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}
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NSOHeader nso_header{};
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if (sizeof(NSOHeader) != file.ReadObject(&nso_header)) {
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return {};
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}
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if (nso_header.magic != Common::MakeMagic('N', 'S', 'O', '0')) {
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return {};
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}
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// Build program image
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Kernel::CodeSet codeset;
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Kernel::PhysicalMemory program_image;
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for (std::size_t i = 0; i < nso_header.segments.size(); ++i) {
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std::vector<u8> data =
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file.ReadBytes(nso_header.segments_compressed_size[i], nso_header.segments[i].offset);
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if (nso_header.IsSegmentCompressed(i)) {
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data = DecompressSegment(data, nso_header.segments[i]);
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}
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program_image.resize(nso_header.segments[i].location +
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PageAlignSize(static_cast<u32>(data.size())));
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std::memcpy(program_image.data() + nso_header.segments[i].location, data.data(),
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data.size());
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codeset.segments[i].addr = nso_header.segments[i].location;
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codeset.segments[i].offset = nso_header.segments[i].location;
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codeset.segments[i].size = PageAlignSize(static_cast<u32>(data.size()));
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}
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if (should_pass_arguments) {
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std::vector<u8> arg_data{Settings::values.program_args.begin(),
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Settings::values.program_args.end()};
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if (arg_data.empty()) {
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arg_data.resize(NSO_ARGUMENT_DEFAULT_SIZE);
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}
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codeset.DataSegment().size += NSO_ARGUMENT_DATA_ALLOCATION_SIZE;
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NSOArgumentHeader args_header{
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NSO_ARGUMENT_DATA_ALLOCATION_SIZE, static_cast<u32_le>(arg_data.size()), {}};
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const auto end_offset = program_image.size();
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program_image.resize(static_cast<u32>(program_image.size()) +
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NSO_ARGUMENT_DATA_ALLOCATION_SIZE);
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std::memcpy(program_image.data() + end_offset, &args_header, sizeof(NSOArgumentHeader));
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std::memcpy(program_image.data() + end_offset + sizeof(NSOArgumentHeader), arg_data.data(),
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arg_data.size());
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}
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// MOD header pointer is at .text offset + 4
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u32 module_offset;
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std::memcpy(&module_offset, program_image.data() + 4, sizeof(u32));
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// Read MOD header
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MODHeader mod_header{};
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// Default .bss to size in segment header if MOD0 section doesn't exist
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u32 bss_size{PageAlignSize(nso_header.segments[2].bss_size)};
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std::memcpy(&mod_header, program_image.data() + module_offset, sizeof(MODHeader));
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const bool has_mod_header{mod_header.magic == Common::MakeMagic('M', 'O', 'D', '0')};
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if (has_mod_header) {
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// Resize program image to include .bss section and page align each section
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bss_size = PageAlignSize(mod_header.bss_end_offset - mod_header.bss_start_offset);
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}
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codeset.DataSegment().size += bss_size;
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const u32 image_size{PageAlignSize(static_cast<u32>(program_image.size()) + bss_size)};
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program_image.resize(image_size);
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// Apply patches if necessary
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if (pm && (pm->HasNSOPatch(nso_header.build_id) || Settings::values.dump_nso)) {
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std::vector<u8> pi_header;
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pi_header.insert(pi_header.begin(), reinterpret_cast<u8*>(&nso_header),
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reinterpret_cast<u8*>(&nso_header) + sizeof(NSOHeader));
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pi_header.insert(pi_header.begin() + sizeof(NSOHeader), program_image.data(),
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program_image.data() + program_image.size());
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pi_header = pm->PatchNSO(pi_header, file.GetName());
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std::copy(pi_header.begin() + sizeof(NSOHeader), pi_header.end(), program_image.data());
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}
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// Apply cheats if they exist and the program has a valid title ID
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if (pm) {
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auto& system = Core::System::GetInstance();
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system.SetCurrentProcessBuildID(nso_header.build_id);
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const auto cheats = pm->CreateCheatList(system, nso_header.build_id);
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if (!cheats.empty()) {
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system.RegisterCheatList(cheats, nso_header.build_id, load_base, image_size);
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}
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}
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// Load codeset for current process
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codeset.memory = std::move(program_image);
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process.LoadModule(std::move(codeset), load_base);
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// Register module with GDBStub
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GDBStub::RegisterModule(file.GetName(), load_base, load_base);
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return load_base + image_size;
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}
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AppLoader_NSO::LoadResult AppLoader_NSO::Load(Kernel::Process& process) {
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if (is_loaded) {
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return {ResultStatus::ErrorAlreadyLoaded, {}};
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}
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modules.clear();
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// Load module
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const VAddr base_address = process.VMManager().GetCodeRegionBaseAddress();
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if (!LoadModule(process, *file, base_address, true)) {
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return {ResultStatus::ErrorLoadingNSO, {}};
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}
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modules.insert_or_assign(base_address, file->GetName());
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LOG_DEBUG(Loader, "loaded module {} @ 0x{:X}", file->GetName(), base_address);
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is_loaded = true;
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return {ResultStatus::Success,
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LoadParameters{Kernel::THREADPRIO_DEFAULT, Memory::DEFAULT_STACK_SIZE}};
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}
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ResultStatus AppLoader_NSO::ReadNSOModules(Modules& modules) {
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modules = this->modules;
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return ResultStatus::Success;
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}
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} // namespace Loader
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