235 lines
8.9 KiB
C++
235 lines
8.9 KiB
C++
// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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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/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/settings.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/hle/kernel/code_set.h"
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#include "core/hle/kernel/k_page_table.h"
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#include "core/hle/kernel/k_process.h"
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#include "core/hle/kernel/k_thread.h"
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#include "core/loader/nso.h"
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#include "core/memory.h"
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#ifdef HAS_NCE
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#include "core/arm/nce/patch.h"
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#endif
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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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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 static_cast<u32>((size + Core::Memory::YUZU_PAGEMASK) & ~Core::Memory::YUZU_PAGEMASK);
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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& in_file) {
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u32 magic = 0;
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if (in_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::KProcess& process, Core::System& system,
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const FileSys::VfsFile& nso_file, VAddr load_base,
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bool should_pass_arguments, bool load_into_process,
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std::optional<FileSys::PatchManager> pm,
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Core::NCE::Patcher* patch) {
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if (nso_file.GetSize() < sizeof(NSOHeader)) {
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return std::nullopt;
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}
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NSOHeader nso_header{};
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if (sizeof(NSOHeader) != nso_file.ReadObject(&nso_header)) {
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return std::nullopt;
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}
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if (nso_header.magic != Common::MakeMagic('N', 'S', 'O', '0')) {
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return std::nullopt;
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}
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// Allocate some space at the beginning if we are patching in PreText mode.
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const size_t module_start = [&]() -> size_t {
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#ifdef HAS_NCE
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if (patch && patch->GetPatchMode() == Core::NCE::PatchMode::PreText) {
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return patch->GetSectionSize();
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}
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#endif
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return 0;
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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 = nso_file.ReadBytes(nso_header.segments_compressed_size[i],
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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(module_start + nso_header.segments[i].location +
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static_cast<u32>(data.size()));
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std::memcpy(program_image.data() + module_start + nso_header.segments[i].location,
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data.data(), data.size());
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codeset.segments[i].addr = module_start + nso_header.segments[i].location;
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codeset.segments[i].offset = module_start + nso_header.segments[i].location;
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codeset.segments[i].size = nso_header.segments[i].size;
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}
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if (should_pass_arguments && !Settings::values.program_args.GetValue().empty()) {
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const auto arg_data{Settings::values.program_args.GetValue()};
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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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codeset.DataSegment().size += nso_header.segments[2].bss_size;
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u32 image_size{
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PageAlignSize(static_cast<u32>(program_image.size()) + nso_header.segments[2].bss_size)};
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program_image.resize(image_size);
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for (std::size_t i = 0; i < nso_header.segments.size(); ++i) {
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codeset.segments[i].size = PageAlignSize(codeset.segments[i].size);
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}
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// Apply patches if necessary
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const auto name = nso_file.GetName();
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if (pm && (pm->HasNSOPatch(nso_header.build_id, name) || Settings::values.dump_nso)) {
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std::span<u8> patchable_section(program_image.data() + module_start,
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program_image.size() - module_start);
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std::vector<u8> pi_header(sizeof(NSOHeader) + patchable_section.size());
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std::memcpy(pi_header.data(), &nso_header, sizeof(NSOHeader));
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std::memcpy(pi_header.data() + sizeof(NSOHeader), patchable_section.data(),
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patchable_section.size());
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pi_header = pm->PatchNSO(pi_header, name);
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std::copy(pi_header.begin() + sizeof(NSOHeader), pi_header.end(), patchable_section.data());
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}
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#ifdef HAS_NCE
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// If we are computing the process code layout and using nce backend, patch.
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const auto& code = codeset.CodeSegment();
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if (patch && patch->GetPatchMode() == Core::NCE::PatchMode::None) {
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// Patch SVCs and MRS calls in the guest code
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patch->PatchText(program_image, code);
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// Add patch section size to the module size.
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image_size += static_cast<u32>(patch->GetSectionSize());
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} else if (patch) {
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// Relocate code patch and copy to the program_image.
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patch->RelocateAndCopy(load_base, code, program_image, &process.GetPostHandlers());
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// Update patch section.
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auto& patch_segment = codeset.PatchSegment();
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patch_segment.addr =
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patch->GetPatchMode() == Core::NCE::PatchMode::PreText ? 0 : image_size;
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patch_segment.size = static_cast<u32>(patch->GetSectionSize());
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// Add patch section size to the module size. In PreText mode image_size
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// already contains the patch segment as part of module_start.
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if (patch->GetPatchMode() == Core::NCE::PatchMode::PostData) {
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image_size += patch_segment.size;
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}
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}
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#endif
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// If we aren't actually loading (i.e. just computing the process code layout), we are done
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if (!load_into_process) {
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return load_base + image_size;
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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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system.SetApplicationProcessBuildID(nso_header.build_id);
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const auto cheats = pm->CreateCheatList(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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return load_base + image_size;
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}
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AppLoader_NSO::LoadResult AppLoader_NSO::Load(Kernel::KProcess& process, Core::System& system) {
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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 = GetInteger(process.GetEntryPoint());
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if (!LoadModule(process, system, *file, base_address, true, 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, LoadParameters{Kernel::KThread::DefaultThreadPriority,
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Core::Memory::DEFAULT_STACK_SIZE}};
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}
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ResultStatus AppLoader_NSO::ReadNSOModules(Modules& out_modules) {
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out_modules = this->modules;
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return ResultStatus::Success;
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}
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} // namespace Loader
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