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loader: Add support for NRO, as well as various fixes and shared linker.

This commit is contained in:
bunnei 2017-10-05 23:30:08 -04:00
parent d454364bca
commit 33ea53094c
9 changed files with 434 additions and 146 deletions
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4
src/core/CMakeLists.txt
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@ -174,8 +174,10 @@ set(SRCS
hw/y2r.cpp
loader/3dsx.cpp
loader/elf.cpp
loader/linker.cpp
loader/loader.cpp
loader/ncch.cpp
loader/nro.cpp
loader/nso.cpp
loader/smdh.cpp
tracer/recorder.cpp
@ -374,8 +376,10 @@ set(HEADERS
hw/y2r.h
loader/3dsx.h
loader/elf.h
loader/linker.h
loader/loader.h
loader/ncch.h
loader/nro.h
loader/nso.h
loader/smdh.h
tracer/recorder.h

151
src/core/loader/linker.cpp Normal file
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@ -0,0 +1,151 @@
// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <vector>
#include "common/common_funcs.h"
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/loader/linker.h"
#include "core/memory.h"
namespace Loader {
enum class RelocationType : u32 { ABS64 = 257, GLOB_DAT = 1025, JUMP_SLOT = 1026, RELATIVE = 1027 };
enum DynamicType : u32 {
DT_NULL = 0,
DT_PLTRELSZ = 2,
DT_STRTAB = 5,
DT_SYMTAB = 6,
DT_RELA = 7,
DT_RELASZ = 8,
DT_STRSZ = 10,
DT_JMPREL = 23,
};
struct Elf64_Rela {
u64_le offset;
RelocationType type;
u32_le symbol;
s64_le addend;
};
static_assert(sizeof(Elf64_Rela) == 0x18, "Elf64_Rela has incorrect size.");
struct Elf64_Dyn {
u64_le tag;
u64_le value;
};
static_assert(sizeof(Elf64_Dyn) == 0x10, "Elf64_Dyn has incorrect size.");
struct Elf64_Sym {
u32_le name;
INSERT_PADDING_BYTES(0x2);
u16_le shndx;
u64_le value;
u64_le size;
};
static_assert(sizeof(Elf64_Sym) == 0x18, "Elf64_Sym has incorrect size.");
void Linker::WriteRelocations(std::vector<u8>& program_image,
const std::vector<Symbol>& symbols, u64 relocation_offset,
u64 size, bool is_jump_relocation, VAddr load_base) {
for (u64 i = 0; i < size; i += sizeof(Elf64_Rela)) {
Elf64_Rela rela;
std::memcpy(&rela, &program_image[relocation_offset + i], sizeof(Elf64_Rela));
const Symbol& symbol = symbols[rela.symbol];
switch (rela.type) {
case RelocationType::RELATIVE: {
const u64 value = load_base + rela.addend;
if (!symbol.name.empty()) {
exports[symbol.name] = value;
}
std::memcpy(&program_image[rela.offset], &value, sizeof(u64));
break;
}
case RelocationType::JUMP_SLOT:
case RelocationType::GLOB_DAT:
if (!symbol.value) {
imports[symbol.name] = {rela.offset + load_base, 0};
} else {
exports[symbol.name] = symbol.value;
std::memcpy(&program_image[rela.offset], &symbol.value, sizeof(u64));
}
break;
case RelocationType::ABS64:
if (!symbol.value) {
imports[symbol.name] = {rela.offset + load_base, rela.addend};
} else {
const u64 value = symbol.value + rela.addend;
exports[symbol.name] = value;
std::memcpy(&program_image[rela.offset], &value, sizeof(u64));
}
break;
default:
LOG_CRITICAL(Loader, "Unknown relocation type: %d", rela.type);
break;
}
}
}
void Linker::Relocate(std::vector<u8>& program_image, u32 dynamic_section_offset,
VAddr load_base) {
std::map<u64, u64> dynamic;
while (dynamic_section_offset < program_image.size()) {
Elf64_Dyn dyn;
std::memcpy(&dyn, &program_image[dynamic_section_offset], sizeof(Elf64_Dyn));
dynamic_section_offset += sizeof(Elf64_Dyn);
if (dyn.tag == DT_NULL) {
break;
}
dynamic[dyn.tag] = dyn.value;
}
u64 offset = dynamic[DT_SYMTAB];
std::vector<Symbol> symbols;
while (offset < program_image.size()) {
Elf64_Sym sym;
std::memcpy(&sym, &program_image[offset], sizeof(Elf64_Sym));
offset += sizeof(Elf64_Sym);
if (sym.name >= dynamic[DT_STRSZ]) {
break;
}
std::string name = reinterpret_cast<char*>(&program_image[dynamic[DT_STRTAB] + sym.name]);
if (sym.value) {
exports[name] = load_base + sym.value;
symbols.emplace_back(std::move(name), load_base + sym.value);
} else {
symbols.emplace_back(std::move(name), 0);
}
}
if (dynamic.find(DT_RELA) != dynamic.end()) {
WriteRelocations(program_image, symbols, dynamic[DT_RELA], dynamic[DT_RELASZ], false,
load_base);
}
if (dynamic.find(DT_JMPREL) != dynamic.end()) {
WriteRelocations(program_image, symbols, dynamic[DT_JMPREL], dynamic[DT_PLTRELSZ], true,
load_base);
}
}
void Linker::ResolveImports() {
// Resolve imports
for (const auto& import : imports) {
const auto& search = exports.find(import.first);
if (search != exports.end()) {
Memory::Write64(import.second.ea, search->second + import.second.addend);
}
else {
LOG_ERROR(Loader, "Unresolved import: %s", import.first.c_str());
}
}
}
} // namespace Loader

37
src/core/loader/linker.h Normal file
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@ -0,0 +1,37 @@
// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <map>
#include <string>
#include "common/common_types.h"
namespace Loader {
class Linker {
protected:
struct Symbol {
Symbol(std::string&& name, u64 value) : name(std::move(name)), value(value) {}
std::string name;
u64 value;
};
struct Import {
VAddr ea;
s64 addend;
};
void WriteRelocations(std::vector<u8>& program_image, const std::vector<Symbol>& symbols,
u64 relocation_offset, u64 size, bool is_jump_relocation,
VAddr load_base);
void Relocate(std::vector<u8>& program_image, u32 dynamic_section_offset, VAddr load_base);
void ResolveImports();
std::map<std::string, Import> imports;
std::map<std::string, VAddr> exports;
};
} // namespace Loader

6
src/core/loader/loader.cpp
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@ -10,6 +10,7 @@
#include "core/loader/3dsx.h"
#include "core/loader/elf.h"
#include "core/loader/ncch.h"
#include "core/loader/nro.h"
#include "core/loader/nso.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
@ -34,6 +35,7 @@ FileType IdentifyFile(FileUtil::IOFile& file) {
CHECK_TYPE(ELF)
CHECK_TYPE(NCCH)
CHECK_TYPE(NSO)
CHECK_TYPE(NRO)
#undef CHECK_TYPE
@ -121,6 +123,10 @@ static std::unique_ptr<AppLoader> GetFileLoader(FileUtil::IOFile&& file, FileTyp
case FileType::NSO:
return std::make_unique<AppLoader_NSO>(std::move(file), filename, filepath);
// NX NRO file format.
case FileType::NRO:
return std::make_unique<AppLoader_NRO>(std::move(file), filename, filepath);
default:
return nullptr;
}

1
src/core/loader/loader.h
View File

@ -33,6 +33,7 @@ enum class FileType {
ELF,
THREEDSX, // 3DSX
NSO,
NRO,
};
/**

173
src/core/loader/nro.cpp Normal file
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@ -0,0 +1,173 @@
// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <vector>
#include "common/logging/log.h"
#include "common/swap.h"
#include "core/hle/kernel/process.h"
#include "core/hle/kernel/resource_limit.h"
#include "core/loader/nro.h"
#include "core/memory.h"
namespace Loader {
struct NroSegmentHeader {
u32_le offset;
u32_le size;
};
static_assert(sizeof(NroSegmentHeader) == 0x8, "NroSegmentHeader has incorrect size.");
struct NroHeader {
INSERT_PADDING_BYTES(0x4);
u32_le module_header_offset;
INSERT_PADDING_BYTES(0x8);
u32_le magic;
INSERT_PADDING_BYTES(0x4);
u32_le file_size;
INSERT_PADDING_BYTES(0x4);
std::array<NroSegmentHeader, 3> segments; // Text, RoData, Data (in that order)
u32_le bss_size;
INSERT_PADDING_BYTES(0x44);
};
static_assert(sizeof(NroHeader) == 0x80, "NroHeader has incorrect size.");
struct ModHeader {
u32_le magic;
u32_le dynamic_offset;
u32_le bss_start_offset;
u32_le bss_end_offset;
u32_le unwind_start_offset;
u32_le unwind_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.");
FileType AppLoader_NRO::IdentifyType(FileUtil::IOFile& file) {
// Read NSO header
NroHeader nro_header{};
file.Seek(0, SEEK_SET);
if (sizeof(NroHeader) != file.ReadBytes(&nro_header, sizeof(NroHeader))) {
return FileType::Error;
}
if (nro_header.magic == MakeMagic('N', 'R', 'O', '0')) {
return FileType::NRO;
}
return FileType::Error;
}
static constexpr u32 PageAlignSize(u32 size) {
return (size + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
}
static std::vector<u8> ReadSegment(FileUtil::IOFile& file, const NroSegmentHeader& header) {
std::vector<u8> data;
data.resize(header.size);
file.Seek(header.offset + sizeof(NroHeader), SEEK_SET);
size_t bytes_read{file.ReadBytes(data.data(), header.size)};
if (header.size != PageAlignSize(static_cast<u32>(bytes_read))) {
LOG_CRITICAL(Loader, "Failed to read NRO segment bytes", header.size);
return {};
}
return data;
}
VAddr AppLoader_NRO::GetEntryPoint(VAddr load_base) const {
// Find nnMain function, set entrypoint to that address
const auto& search = exports.find("nnMain");
if (search != exports.end()) {
return load_base + search->second;
}
const VAddr entry_point{load_base + sizeof(NroHeader)};
LOG_ERROR(Loader, "Unable to find entrypoint, defaulting to: 0x%llx", entry_point);
return entry_point;
}
bool AppLoader_NRO::LoadNro(const std::string& path, VAddr load_base) {
FileUtil::IOFile file(path, "rb");
if (!file.IsOpen()) {
return {};
}
// Read NSO header
NroHeader nro_header{};
file.Seek(0, SEEK_SET);
if (sizeof(NroHeader) != file.ReadBytes(&nro_header, sizeof(NroHeader))) {
return {};
}
if (nro_header.magic != MakeMagic('N', 'R', 'O', '0')) {
return {};
}
// Build program image
Kernel::SharedPtr<Kernel::CodeSet> codeset = Kernel::CodeSet::Create("", 0);
std::vector<u8> program_image;
program_image.resize(PageAlignSize(nro_header.file_size + nro_header.bss_size));
file.Seek(0, SEEK_SET);
file.ReadBytes(program_image.data(), nro_header.file_size);
for (int i = 0; i < nro_header.segments.size(); ++i) {
codeset->segments[i].addr = nro_header.segments[i].offset;
codeset->segments[i].offset = nro_header.segments[i].offset;
codeset->segments[i].size = PageAlignSize(nro_header.segments[i].size);
}
// Read MOD header
ModHeader mod_header{};
u32 bss_size{Memory::PAGE_SIZE}; // Default .bss to page size if MOD0 section doesn't exist
std::memcpy(&mod_header, program_image.data() + nro_header.module_header_offset,
sizeof(ModHeader));
const bool has_mod_header{mod_header.magic == 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->data.size += bss_size;
}
program_image.resize(PageAlignSize(static_cast<u32>(program_image.size()) + bss_size));
// Relocate symbols if there was a proper MOD header - This must happen after the image has been
// loaded into memory
if (has_mod_header) {
Relocate(program_image, nro_header.module_header_offset + mod_header.dynamic_offset,
load_base);
}
// Load codeset for current process
codeset->name = path;
codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
Kernel::g_current_process->LoadModule(codeset, load_base);
return true;
}
ResultStatus AppLoader_NRO::Load() {
if (is_loaded) {
return ResultStatus::ErrorAlreadyLoaded;
}
if (!file.IsOpen()) {
return ResultStatus::Error;
}
// Load and relocate "main" and "sdk" NSO
static constexpr VAddr main_base{0x10000000};
Kernel::g_current_process = Kernel::Process::Create("main");
if (!LoadNro(filepath, main_base)) {
return ResultStatus::ErrorInvalidFormat;
}
Kernel::g_current_process->svc_access_mask.set();
Kernel::g_current_process->address_mappings = default_address_mappings;
Kernel::g_current_process->resource_limit =
Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION);
Kernel::g_current_process->Run(GetEntryPoint(main_base), 48, Kernel::DEFAULT_STACK_SIZE);
ResolveImports();
is_loaded = true;
return ResultStatus::Success;
}
} // namespace Loader

45
src/core/loader/nro.h Normal file
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@ -0,0 +1,45 @@
// Copyright 2017 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <map>
#include <string>
#include "common/common_types.h"
#include "common/file_util.h"
#include "core/hle/kernel/kernel.h"
#include "core/loader/linker.h"
#include "core/loader/loader.h"
namespace Loader {
/// Loads an NRO file
class AppLoader_NRO final : public AppLoader, Linker {
public:
AppLoader_NRO(FileUtil::IOFile&& file, std::string filename, std::string filepath)
: AppLoader(std::move(file)), filename(std::move(filename)), filepath(std::move(filepath)) {
}
/**
* Returns the type of the file
* @param file FileUtil::IOFile open file
* @return FileType found, or FileType::Error if this loader doesn't know it
*/
static FileType IdentifyType(FileUtil::IOFile& file);
FileType GetFileType() override {
return IdentifyType(file);
}
ResultStatus Load() override;
private:
VAddr GetEntryPoint(VAddr load_base) const;
bool LoadNro(const std::string& path, VAddr load_base);
std::string filename;
std::string filepath;
};
} // namespace Loader

143
src/core/loader/nso.cpp
View File

@ -14,19 +14,6 @@
namespace Loader {
enum class RelocationType : u32 { ABS64 = 257, GLOB_DAT = 1025, JUMP_SLOT = 1026, RELATIVE = 1027 };
enum DynamicType : u32 {
DT_NULL = 0,
DT_PLTRELSZ = 2,
DT_STRTAB = 5,
DT_SYMTAB = 6,
DT_RELA = 7,
DT_RELASZ = 8,
DT_STRSZ = 10,
DT_JMPREL = 23,
};
struct NsoSegmentHeader {
u32_le offset;
u32_le location;
@ -46,8 +33,6 @@ struct NsoHeader {
static_assert(sizeof(NsoHeader) == 0x6c, "NsoHeader has incorrect size.");
struct ModHeader {
INSERT_PADDING_BYTES(0x4);
u32_le offset_to_start; // Always 8
u32_le magic;
u32_le dynamic_offset;
u32_le bss_start_offset;
@ -56,7 +41,7 @@ struct ModHeader {
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) == 0x24, "ModHeader has incorrect size.");
static_assert(sizeof(ModHeader) == 0x1c, "ModHeader has incorrect size.");
FileType AppLoader_NSO::IdentifyType(FileUtil::IOFile& file) {
u32 magic = 0;
@ -95,101 +80,6 @@ static std::vector<u8> ReadSegment(FileUtil::IOFile& file, const NsoSegmentHeade
return uncompressed_data;
}
void AppLoader_NSO::WriteRelocations(const std::vector<Symbol>& symbols, VAddr load_base,
u64 relocation_offset, u64 size, bool is_jump_relocation) {
for (u64 i = 0; i < size; i += 0x18) {
VAddr addr = load_base + relocation_offset + i;
u64 offset = Memory::Read64(addr);
u64 info = Memory::Read64(addr + 8);
u64 addend_unsigned = Memory::Read64(addr + 16);
s64 addend{};
std::memcpy(&addend, &addend_unsigned, sizeof(u64));
RelocationType rtype = static_cast<RelocationType>(info & 0xFFFFFFFF);
u32 rsym = static_cast<u32>(info >> 32);
VAddr ea = load_base + offset;
const Symbol& symbol = symbols[rsym];
switch (rtype) {
case RelocationType::RELATIVE:
if (!symbol.name.empty()) {
exports[symbol.name] = load_base + addend;
}
Memory::Write64(ea, load_base + addend);
break;
case RelocationType::JUMP_SLOT:
case RelocationType::GLOB_DAT:
if (!symbol.value) {
imports[symbol.name] = {ea, 0};
} else {
exports[symbol.name] = symbol.value;
Memory::Write64(ea, symbol.value);
}
break;
case RelocationType::ABS64:
if (!symbol.value) {
imports[symbol.name] = {ea, addend};
} else {
exports[symbol.name] = symbol.value + addend;
Memory::Write64(ea, symbol.value + addend);
}
break;
default:
LOG_CRITICAL(Loader, "Unknown relocation type: %d", rtype);
break;
}
}
}
void AppLoader_NSO::Relocate(VAddr load_base, VAddr dynamic_section_addr) {
std::map<u64, u64> dynamic;
while (1) {
u64 tag = Memory::Read64(dynamic_section_addr);
u64 value = Memory::Read64(dynamic_section_addr + 8);
dynamic_section_addr += 16;
if (tag == DT_NULL) {
break;
}
dynamic[tag] = value;
}
u64 strtabsize = dynamic[DT_STRSZ];
std::vector<u8> strtab;
strtab.resize(strtabsize);
Memory::ReadBlock(load_base + dynamic[DT_STRTAB], strtab.data(), strtabsize);
VAddr addr = load_base + dynamic[DT_SYMTAB];
std::vector<Symbol> symbols;
while (1) {
const u32 stname = Memory::Read32(addr);
const u16 stshndx = Memory::Read16(addr + 6);
const u64 stvalue = Memory::Read64(addr + 8);
addr += 24;
if (stname >= strtabsize) {
break;
}
std::string name = reinterpret_cast<char*>(&strtab[stname]);
if (stvalue) {
exports[name] = load_base + stvalue;
symbols.emplace_back(std::move(name), load_base + stvalue);
} else {
symbols.emplace_back(std::move(name), 0);
}
}
if (dynamic.find(DT_RELA) != dynamic.end()) {
WriteRelocations(symbols, load_base, dynamic[DT_RELA], dynamic[DT_RELASZ], false);
}
if (dynamic.find(DT_JMPREL) != dynamic.end()) {
WriteRelocations(symbols, load_base, dynamic[DT_JMPREL], dynamic[DT_PLTRELSZ], true);
}
}
VAddr AppLoader_NSO::GetEntryPoint(VAddr load_base) const {
// Find nnMain function, set entrypoint to that address
const auto& search = exports.find("nnMain");
@ -233,10 +123,14 @@ bool AppLoader_NSO::LoadNso(const std::string& path, VAddr load_base) {
codeset->segments[i].size = PageAlignSize(static_cast<u32>(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{};
u32 bss_size{Memory::PAGE_SIZE}; // Default .bss to page size if MOD0 section doesn't exist
std::memcpy(&mod_header, program_image.data(), sizeof(ModHeader));
std::memcpy(&mod_header, program_image.data() + module_offset, sizeof(ModHeader));
const bool has_mod_header{mod_header.magic == MakeMagic('M', 'O', 'D', '0')};
if (has_mod_header) {
// Resize program image to include .bss section and page align each section
@ -245,16 +139,17 @@ bool AppLoader_NSO::LoadNso(const std::string& path, VAddr load_base) {
}
program_image.resize(PageAlignSize(static_cast<u32>(program_image.size()) + bss_size));
// Relocate symbols if there was a proper MOD header - This must happen after the image has been
// loaded into memory
if (has_mod_header) {
Relocate(program_image, module_offset + mod_header.dynamic_offset, load_base);
}
// Load codeset for current process
codeset->name = path;
codeset->memory = std::make_shared<std::vector<u8>>(std::move(program_image));
Kernel::g_current_process->LoadModule(codeset, load_base);
// Relocate symbols if there was a proper MOD header - This must happen after the image has been
// loaded into memory
if (has_mod_header) {
Relocate(load_base, load_base + mod_header.offset_to_start + mod_header.dynamic_offset);
}
return true;
}
@ -267,13 +162,13 @@ ResultStatus AppLoader_NSO::Load() {
}
// Load and relocate "main" and "sdk" NSO
static constexpr VAddr main_base{0x10000000};
static constexpr VAddr main_base{0x710000000};
Kernel::g_current_process = Kernel::Process::Create("main");
if (!LoadNso(filepath, main_base)) {
return ResultStatus::ErrorInvalidFormat;
}
const std::string sdkpath = filepath.substr(0, filepath.find_last_of("/\\")) + "/sdk";
if (!LoadNso(sdkpath, 0x20000000)) {
if (!LoadNso(sdkpath, 0x720000000)) {
LOG_WARNING(Loader, "failed to find SDK NSO");
}
@ -283,15 +178,7 @@ ResultStatus AppLoader_NSO::Load() {
Kernel::ResourceLimit::GetForCategory(Kernel::ResourceLimitCategory::APPLICATION);
Kernel::g_current_process->Run(GetEntryPoint(main_base), 48, Kernel::DEFAULT_STACK_SIZE);
// Resolve imports
for (const auto& import : imports) {
const auto& search = exports.find(import.first);
if (search != exports.end()) {
Memory::Write64(import.second.ea, search->second + import.second.addend);
} else {
LOG_ERROR(Loader, "Unresolved import: %s", import.first.c_str());
}
}
ResolveImports();
is_loaded = true;
return ResultStatus::Success;

20
src/core/loader/nso.h
View File

@ -9,12 +9,13 @@
#include "common/common_types.h"
#include "common/file_util.h"
#include "core/hle/kernel/kernel.h"
#include "core/loader/linker.h"
#include "core/loader/loader.h"
namespace Loader {
/// Loads an NSO file
class AppLoader_NSO final : public AppLoader {
class AppLoader_NSO final : public AppLoader, Linker {
public:
AppLoader_NSO(FileUtil::IOFile&& file, std::string filename, std::string filepath)
: AppLoader(std::move(file)), filename(std::move(filename)), filepath(std::move(filepath)) {
@ -34,25 +35,8 @@ public:
ResultStatus Load() override;
private:
struct Symbol {
Symbol(std::string&& name, u64 value) : name(std::move(name)), value(value) {}
std::string name;
u64 value;
};
struct Import {
VAddr ea;
s64 addend;
};
void WriteRelocations(const std::vector<Symbol>& symbols, VAddr load_base,
u64 relocation_offset, u64 size, bool is_jump_relocation);
VAddr GetEntryPoint(VAddr load_base) const;
bool LoadNso(const std::string& path, VAddr load_base);
void Relocate(VAddr load_base, VAddr dynamic_section_addr);
std::map<std::string, Import> imports;
std::map<std::string, VAddr> exports;
std::string filename;
std::string filepath;