loader: Add support for NRO, as well as various fixes and shared linker.
bunnei
parent
d454364bca
commit
33ea53094c
@ -0,0 +1,151 @@
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// 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 <vector>
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#include "common/common_funcs.h"
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#include "common/logging/log.h"
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#include "common/swap.h"
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#include "core/loader/linker.h"
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#include "core/memory.h"
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namespace Loader {
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enum class RelocationType : u32 { ABS64 = 257, GLOB_DAT = 1025, JUMP_SLOT = 1026, RELATIVE = 1027 };
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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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struct Elf64_Rela {
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u64_le offset;
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RelocationType type;
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u32_le symbol;
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s64_le addend;
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};
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static_assert(sizeof(Elf64_Rela) == 0x18, "Elf64_Rela has incorrect size.");
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struct Elf64_Dyn {
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u64_le tag;
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u64_le value;
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};
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static_assert(sizeof(Elf64_Dyn) == 0x10, "Elf64_Dyn has incorrect size.");
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struct Elf64_Sym {
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u32_le name;
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INSERT_PADDING_BYTES(0x2);
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u16_le shndx;
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u64_le value;
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u64_le size;
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};
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static_assert(sizeof(Elf64_Sym) == 0x18, "Elf64_Sym has incorrect size.");
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void Linker::WriteRelocations(std::vector<u8>& program_image,
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const std::vector<Symbol>& symbols, u64 relocation_offset,
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u64 size, bool is_jump_relocation, VAddr load_base) {
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for (u64 i = 0; i < size; i += sizeof(Elf64_Rela)) {
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Elf64_Rela rela;
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std::memcpy(&rela, &program_image[relocation_offset + i], sizeof(Elf64_Rela));
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const Symbol& symbol = symbols[rela.symbol];
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switch (rela.type) {
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case RelocationType::RELATIVE: {
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const u64 value = load_base + rela.addend;
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if (!symbol.name.empty()) {
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exports[symbol.name] = value;
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}
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std::memcpy(&program_image[rela.offset], &value, sizeof(u64));
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break;
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}
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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] = {rela.offset + load_base, 0};
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} else {
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exports[symbol.name] = symbol.value;
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std::memcpy(&program_image[rela.offset], &symbol.value, sizeof(u64));
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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] = {rela.offset + load_base, rela.addend};
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} else {
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const u64 value = symbol.value + rela.addend;
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exports[symbol.name] = value;
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std::memcpy(&program_image[rela.offset], &value, sizeof(u64));
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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", rela.type);
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break;
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}
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}
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}
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void Linker::Relocate(std::vector<u8>& program_image, u32 dynamic_section_offset,
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VAddr load_base) {
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std::map<u64, u64> dynamic;
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while (dynamic_section_offset < program_image.size()) {
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Elf64_Dyn dyn;
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std::memcpy(&dyn, &program_image[dynamic_section_offset], sizeof(Elf64_Dyn));
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dynamic_section_offset += sizeof(Elf64_Dyn);
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if (dyn.tag == DT_NULL) {
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break;
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}
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dynamic[dyn.tag] = dyn.value;
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}
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u64 offset = dynamic[DT_SYMTAB];
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std::vector<Symbol> symbols;
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while (offset < program_image.size()) {
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Elf64_Sym sym;
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std::memcpy(&sym, &program_image[offset], sizeof(Elf64_Sym));
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offset += sizeof(Elf64_Sym);
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if (sym.name >= dynamic[DT_STRSZ]) {
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break;
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}
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std::string name = reinterpret_cast<char*>(&program_image[dynamic[DT_STRTAB] + sym.name]);
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if (sym.value) {
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exports[name] = load_base + sym.value;
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symbols.emplace_back(std::move(name), load_base + sym.value);
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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(program_image, symbols, dynamic[DT_RELA], dynamic[DT_RELASZ], false,
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load_base);
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}
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if (dynamic.find(DT_JMPREL) != dynamic.end()) {
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WriteRelocations(program_image, symbols, dynamic[DT_JMPREL], dynamic[DT_PLTRELSZ], true,
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load_base);
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}
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}
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void Linker::ResolveImports() {
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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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}
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else {
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LOG_ERROR(Loader, "Unresolved import: %s", import.first.c_str());
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}
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}
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}
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} // namespace Loader
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@ -0,0 +1,37 @@
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// 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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#pragma once
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#include <map>
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#include <string>
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#include "common/common_types.h"
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namespace Loader {
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class Linker {
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protected:
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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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void WriteRelocations(std::vector<u8>& program_image, const std::vector<Symbol>& symbols,
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u64 relocation_offset, u64 size, bool is_jump_relocation,
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VAddr load_base);
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void Relocate(std::vector<u8>& program_image, u32 dynamic_section_offset, VAddr load_base);
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void ResolveImports();
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std::map<std::string, Import> imports;
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std::map<std::string, VAddr> exports;
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};
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} // namespace Loader
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@ -0,0 +1,173 @@
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// 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 <vector>
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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/nro.h"
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#include "core/memory.h"
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namespace Loader {
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struct NroSegmentHeader {
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u32_le offset;
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u32_le size;
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};
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static_assert(sizeof(NroSegmentHeader) == 0x8, "NroSegmentHeader has incorrect size.");
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struct NroHeader {
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INSERT_PADDING_BYTES(0x4);
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u32_le module_header_offset;
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INSERT_PADDING_BYTES(0x8);
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u32_le magic;
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INSERT_PADDING_BYTES(0x4);
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u32_le file_size;
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INSERT_PADDING_BYTES(0x4);
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std::array<NroSegmentHeader, 3> segments; // Text, RoData, Data (in that order)
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u32_le bss_size;
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INSERT_PADDING_BYTES(0x44);
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};
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static_assert(sizeof(NroHeader) == 0x80, "NroHeader has incorrect size.");
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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 unwind_start_offset;
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u32_le unwind_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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FileType AppLoader_NRO::IdentifyType(FileUtil::IOFile& file) {
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// Read NSO header
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NroHeader nro_header{};
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file.Seek(0, SEEK_SET);
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if (sizeof(NroHeader) != file.ReadBytes(&nro_header, sizeof(NroHeader))) {
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return FileType::Error;
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}
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if (nro_header.magic == MakeMagic('N', 'R', 'O', '0')) {
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return FileType::NRO;
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}
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return FileType::Error;
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}
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static constexpr u32 PageAlignSize(u32 size) {
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return (size + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
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}
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static std::vector<u8> ReadSegment(FileUtil::IOFile& file, const NroSegmentHeader& header) {
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std::vector<u8> data;
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data.resize(header.size);
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file.Seek(header.offset + sizeof(NroHeader), SEEK_SET);
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size_t bytes_read{file.ReadBytes(data.data(), header.size)};
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if (header.size != PageAlignSize(static_cast<u32>(bytes_read))) {
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LOG_CRITICAL(Loader, "Failed to read NRO segment bytes", header.size);
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return {};
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}
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return data;
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}
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VAddr AppLoader_NRO::GetEntryPoint(VAddr load_base) const {
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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 load_base + search->second;
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}
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const VAddr entry_point{load_base + sizeof(NroHeader)};
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LOG_ERROR(Loader, "Unable to find entrypoint, defaulting to: 0x%llx", entry_point);
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return entry_point;
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}
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bool AppLoader_NRO::LoadNro(const std::string& path, VAddr load_base) {
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FileUtil::IOFile file(path, "rb");
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if (!file.IsOpen()) {
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return {};
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}
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// Read NSO header
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NroHeader nro_header{};
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file.Seek(0, SEEK_SET);
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if (sizeof(NroHeader) != file.ReadBytes(&nro_header, sizeof(NroHeader))) {
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return {};
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}
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if (nro_header.magic != MakeMagic('N', 'R', 'O', '0')) {
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return {};
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}
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// Build program image
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Kernel::SharedPtr<Kernel::CodeSet> codeset = Kernel::CodeSet::Create("", 0);
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std::vector<u8> program_image;
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program_image.resize(PageAlignSize(nro_header.file_size + nro_header.bss_size));
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file.Seek(0, SEEK_SET);
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file.ReadBytes(program_image.data(), nro_header.file_size);
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for (int i = 0; i < nro_header.segments.size(); ++i) {
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codeset->segments[i].addr = nro_header.segments[i].offset;
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codeset->segments[i].offset = nro_header.segments[i].offset;
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codeset->segments[i].size = PageAlignSize(nro_header.segments[i].size);
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}
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// Read MOD header
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ModHeader mod_header{};
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u32 bss_size{Memory::PAGE_SIZE}; // Default .bss to page size if MOD0 section doesn't exist
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std::memcpy(&mod_header, program_image.data() + nro_header.module_header_offset,
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sizeof(ModHeader));
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const bool has_mod_header{mod_header.magic == MakeMagic('M', 'O', 'D', '0')};
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if (has_mod_header) {
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// Resize program image to include .bss section and page align each section
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bss_size = PageAlignSize(mod_header.bss_end_offset - mod_header.bss_start_offset);
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codeset->data.size += bss_size;
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}
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program_image.resize(PageAlignSize(static_cast<u32>(program_image.size()) + bss_size));
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// Relocate symbols if there was a proper MOD header - This must happen after the image has been
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// loaded into memory
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if (has_mod_header) {
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Relocate(program_image, nro_header.module_header_offset + mod_header.dynamic_offset,
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load_base);
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}
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// Load codeset for current process
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codeset->name = path;
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codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
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Kernel::g_current_process->LoadModule(codeset, load_base);
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return true;
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}
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ResultStatus AppLoader_NRO::Load() {
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if (is_loaded) {
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return ResultStatus::ErrorAlreadyLoaded;
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}
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if (!file.IsOpen()) {
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return ResultStatus::Error;
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}
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// Load and relocate "main" and "sdk" NSO
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static constexpr VAddr main_base{0x10000000};
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Kernel::g_current_process = Kernel::Process::Create("main");
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if (!LoadNro(filepath, main_base)) {
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return ResultStatus::ErrorInvalidFormat;
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}
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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->Run(GetEntryPoint(main_base), 48, Kernel::DEFAULT_STACK_SIZE);
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ResolveImports();
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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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@ -0,0 +1,45 @@
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// 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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#pragma once
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#include <map>
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#include <string>
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#include "common/common_types.h"
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#include "common/file_util.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/loader/linker.h"
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#include "core/loader/loader.h"
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namespace Loader {
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/// Loads an NRO file
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class AppLoader_NRO final : public AppLoader, Linker {
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public:
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AppLoader_NRO(FileUtil::IOFile&& file, std::string filename, std::string filepath)
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: AppLoader(std::move(file)), filename(std::move(filename)), filepath(std::move(filepath)) {
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}
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/**
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* Returns the type of the file
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* @param file FileUtil::IOFile open file
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* @return FileType found, or FileType::Error if this loader doesn't know it
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*/
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static FileType IdentifyType(FileUtil::IOFile& file);
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FileType GetFileType() override {
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return IdentifyType(file);
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}
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ResultStatus Load() override;
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private:
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VAddr GetEntryPoint(VAddr load_base) const;
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bool LoadNro(const std::string& path, VAddr load_base);
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std::string filename;
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std::string filepath;
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};
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} // namespace Loader
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