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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cinttypes>
#include <vector>
#include <lz4.h>
#include "common/common_funcs.h"
#include "common/file_util.h"
#include "common/hex_util.h"
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/core.h"
#include "core/file_sys/patch_manager.h"
#include "core/gdbstub/gdbstub.h"
#include "core/hle/kernel/code_set.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/vm_manager.h"
#include "core/loader/nso.h"
#include "core/memory.h"
#include "core/settings.h"
namespace Loader {
namespace {
struct MODHeader {
u32_le magic;
u32_le dynamic_offset;
u32_le bss_start_offset;
u32_le bss_end_offset;
u32_le eh_frame_hdr_start_offset;
u32_le eh_frame_hdr_end_offset;
u32_le module_offset; // Offset to runtime-generated module object. typically equal to .bss base
};
static_assert(sizeof(MODHeader) == 0x1c, "MODHeader has incorrect size.");
std::vector<u8> DecompressSegment(const std::vector<u8>& compressed_data,
const NSOSegmentHeader& header) {
std::vector<u8> uncompressed_data(header.size);
const int bytes_uncompressed =
LZ4_decompress_safe(reinterpret_cast<const char*>(compressed_data.data()),
reinterpret_cast<char*>(uncompressed_data.data()),
static_cast<int>(compressed_data.size()), header.size);
ASSERT_MSG(bytes_uncompressed == static_cast<int>(header.size) &&
bytes_uncompressed == static_cast<int>(uncompressed_data.size()),
"{} != {} != {}", bytes_uncompressed, header.size, uncompressed_data.size());
return uncompressed_data;
}
constexpr u32 PageAlignSize(u32 size) {
return (size + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
}
} // Anonymous namespace
bool NSOHeader::IsSegmentCompressed(size_t segment_num) const {
ASSERT_MSG(segment_num < 3, "Invalid segment {}", segment_num);
return ((flags >> segment_num) & 1) != 0;
}
AppLoader_NSO::AppLoader_NSO(FileSys::VirtualFile file) : AppLoader(std::move(file)) {}
FileType AppLoader_NSO::IdentifyType(const FileSys::VirtualFile& file) {
u32 magic = 0;
if (file->ReadObject(&magic) != sizeof(magic)) {
return FileType::Error;
}
if (Common::MakeMagic('N', 'S', 'O', '0') != magic) {
return FileType::Error;
}
return FileType::NSO;
}
std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::Process& process,
const FileSys::VfsFile& file, VAddr load_base,
bool should_pass_arguments,
std::optional<FileSys::PatchManager> pm) {
if (file.GetSize() < sizeof(NSOHeader)) {
return {};
}
NSOHeader nso_header{};
if (sizeof(NSOHeader) != file.ReadObject(&nso_header)) {
return {};
}
if (nso_header.magic != Common::MakeMagic('N', 'S', 'O', '0')) {
return {};
}
// Build program image
Kernel::CodeSet codeset;
std::vector<u8> program_image;
for (std::size_t i = 0; i < nso_header.segments.size(); ++i) {
std::vector<u8> data =
file.ReadBytes(nso_header.segments_compressed_size[i], nso_header.segments[i].offset);
if (nso_header.IsSegmentCompressed(i)) {
data = DecompressSegment(data, nso_header.segments[i]);
}
program_image.resize(nso_header.segments[i].location);
program_image.insert(program_image.end(), data.begin(), data.end());
codeset.segments[i].addr = nso_header.segments[i].location;
codeset.segments[i].offset = nso_header.segments[i].location;
codeset.segments[i].size = PageAlignSize(static_cast<u32>(data.size()));
}
if (should_pass_arguments && !Settings::values.program_args.empty()) {
const auto arg_data = Settings::values.program_args;
codeset.DataSegment().size += NSO_ARGUMENT_DATA_ALLOCATION_SIZE;
NSOArgumentHeader args_header{
NSO_ARGUMENT_DATA_ALLOCATION_SIZE, static_cast<u32_le>(arg_data.size()), {}};
const auto end_offset = program_image.size();
program_image.resize(static_cast<u32>(program_image.size()) +
NSO_ARGUMENT_DATA_ALLOCATION_SIZE);
std::memcpy(program_image.data() + end_offset, &args_header, sizeof(NSOArgumentHeader));
std::memcpy(program_image.data() + end_offset + sizeof(NSOArgumentHeader), arg_data.data(),
arg_data.size());
}
// MOD header pointer is at .text offset + 4
u32 module_offset;
std::memcpy(&module_offset, program_image.data() + 4, sizeof(u32));
// Read MOD header
MODHeader mod_header{};
// Default .bss to size in segment header if MOD0 section doesn't exist
u32 bss_size{PageAlignSize(nso_header.segments[2].bss_size)};
std::memcpy(&mod_header, program_image.data() + module_offset, sizeof(MODHeader));
const bool has_mod_header{mod_header.magic == Common::MakeMagic('M', 'O', 'D', '0')};
if (has_mod_header) {
// Resize program image to include .bss section and page align each section
bss_size = PageAlignSize(mod_header.bss_end_offset - mod_header.bss_start_offset);
}
codeset.DataSegment().size += bss_size;
const u32 image_size{PageAlignSize(static_cast<u32>(program_image.size()) + bss_size)};
program_image.resize(image_size);
// Apply patches if necessary
if (pm && (pm->HasNSOPatch(nso_header.build_id) || Settings::values.dump_nso)) {
std::vector<u8> pi_header(sizeof(NSOHeader) + program_image.size());
pi_header.insert(pi_header.begin(), reinterpret_cast<u8*>(&nso_header),
reinterpret_cast<u8*>(&nso_header) + sizeof(NSOHeader));
pi_header.insert(pi_header.begin() + sizeof(NSOHeader), program_image.begin(),
program_image.end());
pi_header = pm->PatchNSO(pi_header);
std::copy(pi_header.begin() + sizeof(NSOHeader), pi_header.end(), program_image.begin());
}
// Apply cheats if they exist and the program has a valid title ID
if (pm) {
auto& system = Core::System::GetInstance();
const auto cheats = pm->CreateCheatList(system, nso_header.build_id);
if (!cheats.empty()) {
system.RegisterCheatList(cheats, Common::HexArrayToString(nso_header.build_id),
load_base, load_base + program_image.size());
}
}
// Load codeset for current process
codeset.memory = std::move(program_image);
process.LoadModule(std::move(codeset), load_base);
// Register module with GDBStub
GDBStub::RegisterModule(file.GetName(), load_base, load_base);
return load_base + image_size;
}
ResultStatus AppLoader_NSO::Load(Kernel::Process& process) {
if (is_loaded) {
return ResultStatus::ErrorAlreadyLoaded;
}
// Load module
const VAddr base_address = process.VMManager().GetCodeRegionBaseAddress();
if (!LoadModule(process, *file, base_address, true)) {
return ResultStatus::ErrorLoadingNSO;
}
LOG_DEBUG(Loader, "loaded module {} @ 0x{:X}", file->GetName(), base_address);
process.Run(base_address, Kernel::THREADPRIO_DEFAULT, Memory::DEFAULT_STACK_SIZE);
is_loaded = true;
return ResultStatus::Success;
}
} // namespace Loader
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