295 lines
9.6 KiB
C++
295 lines
9.6 KiB
C++
// Copyright 2017 Citra Emulator Project
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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 <map>
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#include <string>
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#include <vector>
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#include <lz4.h>
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#include "common/logging/log.h"
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#include "common/swap.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/kernel/resource_limit.h"
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#include "core/loader/nso.h"
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#include "core/memory.h"
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using Kernel::CodeSet;
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using Kernel::SharedPtr;
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namespace Loader {
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FileType AppLoader_NSO::IdentifyType(FileUtil::IOFile& file) {
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u32 magic = 0;
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file.Seek(0, SEEK_SET);
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if (1 != file.ReadArray<u32>(&magic, 1))
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return FileType::Error;
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if (MakeMagic('N', 'S', 'O', '0') == magic)
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return FileType::NSO;
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return FileType::Error;
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}
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struct NsoSegmentHeader {
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u32_le offset;
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u32_le location;
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u32_le size;
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u32_le alignment;
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};
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static_assert(sizeof(NsoSegmentHeader) == 0x10, "NsoSegmentHeader has incorrect size.");
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struct NsoHeader {
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u32_le magic;
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INSERT_PADDING_BYTES(0xc);
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std::array<NsoSegmentHeader, 3> segments; // Text, Data, RoData (in that order)
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INSERT_PADDING_BYTES(0x20);
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std::array<u32_le, 3> segments_compressed_size;
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};
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static_assert(sizeof(NsoHeader) == 0x6c, "NsoHeader has incorrect size.");
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static std::vector<u8> ReadSegment(FileUtil::IOFile& file, const NsoSegmentHeader& header,
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int compressed_size) {
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std::vector<u8> compressed_data;
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compressed_data.resize(compressed_size);
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file.Seek(header.offset, SEEK_SET);
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if (compressed_size != file.ReadBytes(compressed_data.data(), compressed_size)) {
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LOG_CRITICAL(Loader, "Failed to read %d NSO LZ4 compressed bytes", compressed_size);
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return {};
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}
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std::vector<u8> uncompressed_data;
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uncompressed_data.resize(header.size);
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const int bytes_uncompressed =
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LZ4_decompress_safe_partial(reinterpret_cast<const char*>(compressed_data.data()),
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reinterpret_cast<char*>(uncompressed_data.data()),
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compressed_size, header.size, header.size);
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ASSERT_MSG(bytes_uncompressed == header.size, "%d != %d", bytes_uncompressed, header.size);
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return uncompressed_data;
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}
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struct Symbol {
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Symbol(std::string&& name, u64 value) : name(std::move(name)), value(value) {}
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std::string name;
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u64 value;
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};
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struct Import {
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VAddr ea;
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s64 addend;
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};
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enum class RelocationType : u32 {
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ABS64 = 257,
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GLOB_DAT = 1025,
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JUMP_SLOT = 1026,
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RELATIVE = 1027
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};
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enum DynamicType : u32 {
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DT_NULL = 0,
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DT_PLTRELSZ = 2,
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DT_STRTAB = 5,
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DT_SYMTAB = 6,
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DT_RELA = 7,
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DT_RELASZ = 8,
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DT_STRSZ = 10,
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DT_JMPREL = 23,
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};
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void WriteRelocations(const std::vector<Symbol>& symbols, VAddr loadbase, u64 roff, u64 size,
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bool is_jump_relocation, std::map<std::string, Import>& imports,
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std::map<std::string, VAddr>& exports) {
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for (u64 i = 0; i < size; i += 0x18) {
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VAddr addr = loadbase + roff + i;
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u64 offset = Memory::Read64(addr);
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u64 info = Memory::Read64(addr + 8);
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u64 addend_unsigned = Memory::Read64(addr + 16);
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s64 addend{};
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std::memcpy(&addend, &addend_unsigned, sizeof(u64));
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RelocationType rtype = static_cast<RelocationType>(info & 0xFFFFFFFF);
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u32 rsym = static_cast<u32>(info >> 32);
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VAddr ea = loadbase + offset;
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const Symbol& symbol = symbols[rsym];
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switch (rtype) {
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case RelocationType::RELATIVE:
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if (!symbol.name.empty()) {
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exports[symbol.name] = loadbase + addend;
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}
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Memory::Write64(ea, loadbase + addend);
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break;
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case RelocationType::JUMP_SLOT:
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case RelocationType::GLOB_DAT:
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if (!symbol.value) {
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imports[symbol.name] = {ea, 0};
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} else {
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exports[symbol.name] = symbol.value;
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Memory::Write64(ea, symbol.value);
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}
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break;
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case RelocationType::ABS64:
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if (!symbol.value) {
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imports[symbol.name] = {ea, addend};
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} else {
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exports[symbol.name] = symbol.value + addend;
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Memory::Write64(ea, symbol.value + addend);
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}
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break;
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default:
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LOG_CRITICAL(Loader, "Unknown relocation type: %d", rtype);
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break;
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}
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}
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}
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void Relocate(VAddr loadbase, std::map<std::string, Import>& imports,
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std::map<std::string, VAddr>& exports) {
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u32 modoff = Memory::Read32(loadbase + 4);
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ASSERT_MSG(Memory::Read32(loadbase + modoff) == MakeMagic('M', 'O', 'D', '0'),
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"Expected MOD section");
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u64 dynoff = loadbase + modoff + Memory::Read32(loadbase + modoff + 4);
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std::map<u64, u64> dynamic;
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while (1) {
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u64 tag = Memory::Read64(dynoff);
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u64 value = Memory::Read64(dynoff + 8);
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dynoff += 16;
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if (tag == DT_NULL) {
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break;
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}
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dynamic[tag] = value;
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}
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u64 strtabsize = dynamic[DT_STRSZ];
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std::vector<u8> strtab;
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strtab.resize(strtabsize);
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Memory::ReadBlock(loadbase + dynamic[DT_STRTAB], strtab.data(), strtabsize);
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VAddr addr = loadbase + dynamic[DT_SYMTAB];
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std::vector<Symbol> symbols;
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while (1) {
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const u32 stname = Memory::Read32(addr);
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const u16 stshndx = Memory::Read16(addr + 6);
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const u64 stvalue = Memory::Read64(addr + 8);
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addr += 24;
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if (stname >= strtabsize) {
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break;
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}
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std::string name = reinterpret_cast<char*>(&strtab[stname]);
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if (stvalue) {
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exports[name] = loadbase + stvalue;
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symbols.emplace_back(std::move(name), loadbase + stvalue);
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} else {
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symbols.emplace_back(std::move(name), 0);
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}
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}
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if (dynamic.find(DT_RELA) != dynamic.end()) {
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WriteRelocations(symbols, loadbase, dynamic[DT_RELA], dynamic[DT_RELASZ], false, imports,
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exports);
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}
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if (dynamic.find(DT_JMPREL) != dynamic.end()) {
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WriteRelocations(symbols, loadbase, dynamic[DT_JMPREL], dynamic[DT_PLTRELSZ], true, imports,
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exports);
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}
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}
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static VAddr GetEntryPoint(const std::map<std::string, VAddr>& exports) {
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// Find nnMain function, set entrypoint to that address
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const auto& search = exports.find("nnMain");
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if (search != exports.end()) {
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return search->second;
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}
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return {};
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}
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static SharedPtr<CodeSet> LoadModule(const std::string& filepath, VAddr loadbase,
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std::map<std::string, Import>& imports,
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std::map<std::string, VAddr>& exports) {
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FileUtil::IOFile file(filepath, "rb");
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if (!file.IsOpen())
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return {};
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NsoHeader header{};
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file.Seek(0, SEEK_SET);
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if (sizeof(NsoHeader) != file.ReadBytes(&header, sizeof(NsoHeader)))
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return {};
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// Build program image
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SharedPtr<CodeSet> codeset = CodeSet::Create("", 0);
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std::vector<u8> program_image;
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for (int i = 0; i < header.segments.size(); ++i) {
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std::vector<u8> data =
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ReadSegment(file, header.segments[i], header.segments_compressed_size[i]);
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program_image.resize(header.segments[i].location);
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program_image.insert(program_image.end(), data.begin(), data.end());
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codeset->segments[i].addr = header.segments[i].location;
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codeset->segments[i].offset = header.segments[i].location;
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codeset->segments[i].size = (data.size() + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
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}
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program_image.resize((program_image.size() + Memory::PAGE_MASK) & ~Memory::PAGE_MASK);
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codeset->name = filepath;
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codeset->entrypoint = 0; // Set after relocation
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codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
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return codeset;
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}
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ResultStatus AppLoader_NSO::Load() {
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if (is_loaded)
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return ResultStatus::ErrorAlreadyLoaded;
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if (!file.IsOpen())
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return ResultStatus::Error;
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static constexpr VAddr loadbase = 0x7100000000;
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std::map<std::string, Import> imports;
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std::map<std::string, VAddr> exports;
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// Load and relocate "main" NSO
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auto codeset = LoadModule(filepath, loadbase, imports, exports);
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Kernel::g_current_process = Kernel::Process::Create(codeset);
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Kernel::g_current_process->svc_access_mask.set();
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Kernel::g_current_process->address_mappings = default_address_mappings;
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Kernel::g_current_process->resource_limit =
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Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION);
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Kernel::g_current_process->LoadModule(codeset, loadbase);
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Relocate(loadbase, imports, exports);
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codeset->entrypoint = GetEntryPoint(exports);
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Kernel::g_current_process->Run(48, Kernel::DEFAULT_STACK_SIZE);
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// Load and relocate "sdk" NSO
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static constexpr VAddr sdkbase = 0x7200000000;
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const std::string sdkpath = filepath.substr(0, filepath.find_last_of("/\\")) + "/sdk";
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auto sdk_codeset = LoadModule(sdkpath, sdkbase, imports, exports);
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Kernel::g_current_process->LoadModule(sdk_codeset, sdkbase);
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Relocate(sdkbase, imports, exports);
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// Resolve imports
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for (const auto& import : imports) {
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const auto& search = exports.find(import.first);
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if (search != exports.end()) {
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Memory::Write64(import.second.ea, search->second + import.second.addend);
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} else {
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LOG_CRITICAL(Loader, "Unresolved import: %s", import.first.c_str());
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}
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}
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is_loaded = true;
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return ResultStatus::Success;
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}
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} // namespace Loader
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