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yuzu/src/core/loader/nca.cpp
Zach Hilman 69bfe075b5 General Filesystem and Save Data Fixes (#670)
2018-07-17 12:42:15 -07:00

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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <vector>
#include "common/common_funcs.h"
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#include "common/swap.h"
#include "core/core.h"
#include "core/file_sys/program_metadata.h"
#include "core/file_sys/romfs_factory.h"
#include "core/gdbstub/gdbstub.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/hle/service/filesystem/filesystem.h"
#include "core/loader/nca.h"
#include "core/loader/nso.h"
#include "core/memory.h"
namespace Loader {
// Media offsets in headers are stored divided by 512. Mult. by this to get real offset.
constexpr u64 MEDIA_OFFSET_MULTIPLIER = 0x200;
constexpr u64 SECTION_HEADER_SIZE = 0x200;
constexpr u64 SECTION_HEADER_OFFSET = 0x400;
enum class NcaContentType : u8 { Program = 0, Meta = 1, Control = 2, Manual = 3, Data = 4 };
enum class NcaSectionFilesystemType : u8 { PFS0 = 0x2, ROMFS = 0x3 };
struct NcaSectionTableEntry {
u32_le media_offset;
u32_le media_end_offset;
INSERT_PADDING_BYTES(0x8);
};
static_assert(sizeof(NcaSectionTableEntry) == 0x10, "NcaSectionTableEntry has incorrect size.");
struct NcaHeader {
std::array<u8, 0x100> rsa_signature_1;
std::array<u8, 0x100> rsa_signature_2;
u32_le magic;
u8 is_system;
NcaContentType content_type;
u8 crypto_type;
u8 key_index;
u64_le size;
u64_le title_id;
INSERT_PADDING_BYTES(0x4);
u32_le sdk_version;
u8 crypto_type_2;
INSERT_PADDING_BYTES(15);
std::array<u8, 0x10> rights_id;
std::array<NcaSectionTableEntry, 0x4> section_tables;
std::array<std::array<u8, 0x20>, 0x4> hash_tables;
std::array<std::array<u8, 0x10>, 0x4> key_area;
INSERT_PADDING_BYTES(0xC0);
};
static_assert(sizeof(NcaHeader) == 0x400, "NcaHeader has incorrect size.");
struct NcaSectionHeaderBlock {
INSERT_PADDING_BYTES(3);
NcaSectionFilesystemType filesystem_type;
u8 crypto_type;
INSERT_PADDING_BYTES(3);
};
static_assert(sizeof(NcaSectionHeaderBlock) == 0x8, "NcaSectionHeaderBlock has incorrect size.");
struct Pfs0Superblock {
NcaSectionHeaderBlock header_block;
std::array<u8, 0x20> hash;
u32_le size;
INSERT_PADDING_BYTES(4);
u64_le hash_table_offset;
u64_le hash_table_size;
u64_le pfs0_header_offset;
u64_le pfs0_size;
INSERT_PADDING_BYTES(432);
};
static_assert(sizeof(Pfs0Superblock) == 0x200, "Pfs0Superblock has incorrect size.");
static bool IsValidNca(const NcaHeader& header) {
return header.magic == Common::MakeMagic('N', 'C', 'A', '2') ||
header.magic == Common::MakeMagic('N', 'C', 'A', '3');
}
// TODO(DarkLordZach): Add support for encrypted.
class Nca final {
std::vector<FileSys::PartitionFilesystem> pfs;
std::vector<u64> pfs_offset;
u64 romfs_offset = 0;
u64 romfs_size = 0;
boost::optional<u8> exefs_id = boost::none;
FileUtil::IOFile file;
std::string path;
u64 GetExeFsFileOffset(const std::string& file_name) const;
u64 GetExeFsFileSize(const std::string& file_name) const;
public:
ResultStatus Load(FileUtil::IOFile&& file, std::string path);
FileSys::PartitionFilesystem GetPfs(u8 id) const;
u64 GetRomFsOffset() const;
u64 GetRomFsSize() const;
std::vector<u8> GetExeFsFile(const std::string& file_name);
};
static bool IsPfsExeFs(const FileSys::PartitionFilesystem& pfs) {
// According to switchbrew, an exefs must only contain these two files:
return pfs.GetFileSize("main") > 0 && pfs.GetFileSize("main.npdm") > 0;
}
ResultStatus Nca::Load(FileUtil::IOFile&& in_file, std::string in_path) {
file = std::move(in_file);
path = in_path;
file.Seek(0, SEEK_SET);
std::array<u8, sizeof(NcaHeader)> header_array{};
if (sizeof(NcaHeader) != file.ReadBytes(header_array.data(), sizeof(NcaHeader)))
LOG_CRITICAL(Loader, "File reader errored out during header read.");
NcaHeader header{};
std::memcpy(&header, header_array.data(), sizeof(NcaHeader));
if (!IsValidNca(header))
return ResultStatus::ErrorInvalidFormat;
int number_sections =
std::count_if(std::begin(header.section_tables), std::end(header.section_tables),
[](NcaSectionTableEntry entry) { return entry.media_offset > 0; });
for (int i = 0; i < number_sections; ++i) {
// Seek to beginning of this section.
file.Seek(SECTION_HEADER_OFFSET + i * SECTION_HEADER_SIZE, SEEK_SET);
std::array<u8, sizeof(NcaSectionHeaderBlock)> array{};
if (sizeof(NcaSectionHeaderBlock) !=
file.ReadBytes(array.data(), sizeof(NcaSectionHeaderBlock)))
LOG_CRITICAL(Loader, "File reader errored out during header read.");
NcaSectionHeaderBlock block{};
std::memcpy(&block, array.data(), sizeof(NcaSectionHeaderBlock));
if (block.filesystem_type == NcaSectionFilesystemType::ROMFS) {
romfs_offset = header.section_tables[i].media_offset * MEDIA_OFFSET_MULTIPLIER;
romfs_size =
header.section_tables[i].media_end_offset * MEDIA_OFFSET_MULTIPLIER - romfs_offset;
} else if (block.filesystem_type == NcaSectionFilesystemType::PFS0) {
Pfs0Superblock sb{};
// Seek back to beginning of this section.
file.Seek(SECTION_HEADER_OFFSET + i * SECTION_HEADER_SIZE, SEEK_SET);
if (sizeof(Pfs0Superblock) != file.ReadBytes(&sb, sizeof(Pfs0Superblock)))
LOG_CRITICAL(Loader, "File reader errored out during header read.");
u64 offset = (static_cast<u64>(header.section_tables[i].media_offset) *
MEDIA_OFFSET_MULTIPLIER) +
sb.pfs0_header_offset;
FileSys::PartitionFilesystem npfs{};
ResultStatus status = npfs.Load(path, offset);
if (status == ResultStatus::Success) {
pfs.emplace_back(std::move(npfs));
pfs_offset.emplace_back(offset);
}
}
}
for (size_t i = 0; i < pfs.size(); ++i) {
if (IsPfsExeFs(pfs[i]))
exefs_id = i;
}
return ResultStatus::Success;
}
FileSys::PartitionFilesystem Nca::GetPfs(u8 id) const {
return pfs[id];
}
u64 Nca::GetExeFsFileOffset(const std::string& file_name) const {
if (exefs_id == boost::none)
return 0;
return pfs[*exefs_id].GetFileOffset(file_name) + pfs_offset[*exefs_id];
}
u64 Nca::GetExeFsFileSize(const std::string& file_name) const {
if (exefs_id == boost::none)
return 0;
return pfs[*exefs_id].GetFileSize(file_name);
}
u64 Nca::GetRomFsOffset() const {
return romfs_offset;
}
u64 Nca::GetRomFsSize() const {
return romfs_size;
}
std::vector<u8> Nca::GetExeFsFile(const std::string& file_name) {
std::vector<u8> out(GetExeFsFileSize(file_name));
file.Seek(GetExeFsFileOffset(file_name), SEEK_SET);
file.ReadBytes(out.data(), GetExeFsFileSize(file_name));
return out;
}
AppLoader_NCA::AppLoader_NCA(FileUtil::IOFile&& file, std::string filepath)
: AppLoader(std::move(file)), filepath(std::move(filepath)) {}
FileType AppLoader_NCA::IdentifyType(FileUtil::IOFile& file, const std::string&) {
file.Seek(0, SEEK_SET);
std::array<u8, 0x400> header_enc_array{};
if (0x400 != file.ReadBytes(header_enc_array.data(), 0x400))
return FileType::Error;
// TODO(DarkLordZach): Assuming everything is decrypted. Add crypto support.
NcaHeader header{};
std::memcpy(&header, header_enc_array.data(), sizeof(NcaHeader));
if (IsValidNca(header) && header.content_type == NcaContentType::Program)
return FileType::NCA;
return FileType::Error;
}
ResultStatus AppLoader_NCA::Load(Kernel::SharedPtr<Kernel::Process>& process) {
if (is_loaded) {
return ResultStatus::ErrorAlreadyLoaded;
}
if (!file.IsOpen()) {
return ResultStatus::Error;
}
nca = std::make_unique<Nca>();
ResultStatus result = nca->Load(std::move(file), filepath);
if (result != ResultStatus::Success) {
return result;
}
result = metadata.Load(nca->GetExeFsFile("main.npdm"));
if (result != ResultStatus::Success) {
return result;
}
metadata.Print();
const FileSys::ProgramAddressSpaceType arch_bits{metadata.GetAddressSpaceType()};
if (arch_bits == FileSys::ProgramAddressSpaceType::Is32Bit) {
return ResultStatus::ErrorUnsupportedArch;
}
VAddr next_load_addr{Memory::PROCESS_IMAGE_VADDR};
for (const auto& module : {"rtld", "main", "subsdk0", "subsdk1", "subsdk2", "subsdk3",
"subsdk4", "subsdk5", "subsdk6", "subsdk7", "sdk"}) {
const VAddr load_addr = next_load_addr;
next_load_addr = AppLoader_NSO::LoadModule(module, nca->GetExeFsFile(module), load_addr);
if (next_load_addr) {
LOG_DEBUG(Loader, "loaded module {} @ 0x{:X}", module, load_addr);
// Register module with GDBStub
GDBStub::RegisterModule(module, load_addr, next_load_addr - 1, false);
} else {
next_load_addr = load_addr;
}
}
process->program_id = metadata.GetTitleID();
process->svc_access_mask.set();
process->address_mappings = default_address_mappings;
process->resource_limit =
Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION);
process->Run(Memory::PROCESS_IMAGE_VADDR, metadata.GetMainThreadPriority(),
metadata.GetMainThreadStackSize());
if (nca->GetRomFsSize() > 0)
Service::FileSystem::RegisterRomFS(std::make_unique<FileSys::RomFSFactory>(*this));
is_loaded = true;
return ResultStatus::Success;
}
ResultStatus AppLoader_NCA::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset,
u64& size) {
if (nca->GetRomFsSize() == 0) {
LOG_DEBUG(Loader, "No RomFS available");
return ResultStatus::ErrorNotUsed;
}
romfs_file = std::make_shared<FileUtil::IOFile>(filepath, "rb");
offset = nca->GetRomFsOffset();
size = nca->GetRomFsSize();
LOG_DEBUG(Loader, "RomFS offset: 0x{:016X}", offset);
LOG_DEBUG(Loader, "RomFS size: 0x{:016X}", size);
return ResultStatus::Success;
}
AppLoader_NCA::~AppLoader_NCA() = default;
} // namespace Loader
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