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// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <cinttypes>
#include <cstring>
#include <vector>
#include "common/common_funcs.h"
#include "common/hex_util.h"
#include "common/logging/log.h"
#include "common/lz4_compression.h"
#include "common/settings.h"
#include "common/swap.h"
#include "core/core.h"
#include "core/file_sys/patch_manager.h"
#include "core/hle/kernel/code_set.h"
#include "core/hle/kernel/k_page_table.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/k_thread.h"
#include "core/loader/nso.h"
#include "core/memory.h"
#ifdef HAS_NCE
#include "core/arm/nce/patcher.h"
#endif
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 =
Common::Compression::DecompressDataLZ4(compressed_data, header.size);
ASSERT_MSG(uncompressed_data.size() == header.size, "{} != {}", header.size,
uncompressed_data.size());
return uncompressed_data;
}
constexpr u32 PageAlignSize(u32 size) {
return static_cast<u32>((size + Core::Memory::YUZU_PAGEMASK) & ~Core::Memory::YUZU_PAGEMASK);
}
} // 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& in_file) {
u32 magic = 0;
if (in_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::KProcess& process, Core::System& system,
const FileSys::VfsFile& nso_file, VAddr load_base,
bool should_pass_arguments, bool load_into_process,
std::optional<FileSys::PatchManager> pm,
std::vector<Core::NCE::Patcher>* patches,
s32 patch_index) {
if (nso_file.GetSize() < sizeof(NSOHeader)) {
return std::nullopt;
}
NSOHeader nso_header{};
if (sizeof(NSOHeader) != nso_file.ReadObject(&nso_header)) {
return std::nullopt;
}
if (nso_header.magic != Common::MakeMagic('N', 'S', 'O', '0')) {
return std::nullopt;
}
// Allocate some space at the beginning if we are patching in PreText mode.
const size_t module_start = [&]() -> size_t {
#ifdef HAS_NCE
if (patches && load_into_process) {
auto* patch = &patches->operator[](patch_index);
if (patch->GetPatchMode() == Core::NCE::PatchMode::PreText) {
return patch->GetSectionSize();
}
}
#endif
return 0;
}();
// Build program image
Kernel::CodeSet codeset;
Kernel::PhysicalMemory program_image;
for (std::size_t i = 0; i < nso_header.segments.size(); ++i) {
std::vector<u8> data = nso_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(module_start + nso_header.segments[i].location +
static_cast<u32>(data.size()));
std::memcpy(program_image.data() + module_start + nso_header.segments[i].location,
data.data(), data.size());
codeset.segments[i].addr = module_start + nso_header.segments[i].location;
codeset.segments[i].offset = module_start + nso_header.segments[i].location;
codeset.segments[i].size = nso_header.segments[i].size;
}
if (should_pass_arguments && !Settings::values.program_args.GetValue().empty()) {
const auto arg_data{Settings::values.program_args.GetValue()};
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());
}
codeset.DataSegment().size += nso_header.segments[2].bss_size;
u32 image_size{
PageAlignSize(static_cast<u32>(program_image.size()) + nso_header.segments[2].bss_size)};
program_image.resize(image_size);
for (std::size_t i = 0; i < nso_header.segments.size(); ++i) {
codeset.segments[i].size = PageAlignSize(codeset.segments[i].size);
}
// Apply patches if necessary
const auto name = nso_file.GetName();
if (pm && (pm->HasNSOPatch(nso_header.build_id, name) || Settings::values.dump_nso)) {
std::span<u8> patchable_section(program_image.data() + module_start,
program_image.size() - module_start);
std::vector<u8> pi_header(sizeof(NSOHeader) + patchable_section.size());
std::memcpy(pi_header.data(), &nso_header, sizeof(NSOHeader));
std::memcpy(pi_header.data() + sizeof(NSOHeader), patchable_section.data(),
patchable_section.size());
pi_header = pm->PatchNSO(pi_header, name);
std::copy(pi_header.begin() + sizeof(NSOHeader), pi_header.end(), patchable_section.data());
}
#ifdef HAS_NCE
// If we are computing the process code layout and using nce backend, patch.
const auto& code = codeset.CodeSegment();
auto* patch = patches ? &patches->operator[](patch_index) : nullptr;
if (patch && !load_into_process) {
// Patch SVCs and MRS calls in the guest code
while (!patch->PatchText(program_image, code)) {
patch = &patches->emplace_back();
}
} else if (patch) {
// Relocate code patch and copy to the program_image.
if (patch->RelocateAndCopy(load_base, code, program_image, &process.GetPostHandlers())) {
// Update patch section.
auto& patch_segment = codeset.PatchSegment();
patch_segment.addr =
patch->GetPatchMode() == Core::NCE::PatchMode::PreText ? 0 : image_size;
patch_segment.size = static_cast<u32>(patch->GetSectionSize());
}
// Refresh image_size to take account the patch section if it was added by RelocateAndCopy
image_size = static_cast<u32>(program_image.size());
}
#endif
// If we aren't actually loading (i.e. just computing the process code layout), we are done
if (!load_into_process) {
return load_base + image_size;
}
// Apply cheats if they exist and the program has a valid title ID
if (pm) {
system.SetApplicationProcessBuildID(nso_header.build_id);
const auto cheats = pm->CreateCheatList(nso_header.build_id);
if (!cheats.empty()) {
system.RegisterCheatList(cheats, nso_header.build_id, load_base, image_size);
}
}
// Load codeset for current process
codeset.memory = std::move(program_image);
process.LoadModule(std::move(codeset), load_base);
return load_base + image_size;
}
AppLoader_NSO::LoadResult AppLoader_NSO::Load(Kernel::KProcess& process, Core::System& system) {
if (is_loaded) {
return {ResultStatus::ErrorAlreadyLoaded, {}};
}
modules.clear();
// Load module
const VAddr base_address = GetInteger(process.GetEntryPoint());
if (!LoadModule(process, system, *file, base_address, true, true)) {
return {ResultStatus::ErrorLoadingNSO, {}};
}
modules.insert_or_assign(base_address, file->GetName());
LOG_DEBUG(Loader, "loaded module {} @ 0x{:X}", file->GetName(), base_address);
is_loaded = true;
return {ResultStatus::Success, LoadParameters{Kernel::KThread::DefaultThreadPriority,
Core::Memory::DEFAULT_STACK_SIZE}};
}
ResultStatus AppLoader_NSO::ReadNSOModules(Modules& out_modules) {
out_modules = this->modules;
return ResultStatus::Success;
}
} // namespace Loader
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