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authorbunnei <bunneidev@gmail.com>2017-09-30 20:15:09 +0200
committerbunnei <bunneidev@gmail.com>2017-09-30 20:33:58 +0200
commit8c92435ded5c9c89290604a03e307c038b4d4117 (patch)
tree89640df0ae25ef5c78b79c1d8169f5ad6c25d63b /src/core/loader/nso.cpp
parentprocess: Support loading multiple codesets. (diff)
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Diffstat (limited to '')
-rw-r--r--src/core/loader/nso.cpp223
1 files changed, 111 insertions, 112 deletions
diff --git a/src/core/loader/nso.cpp b/src/core/loader/nso.cpp
index ca8c59cd5..f5083d122 100644
--- a/src/core/loader/nso.cpp
+++ b/src/core/loader/nso.cpp
@@ -2,8 +2,6 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
-#include <map>
-#include <string>
#include <vector>
#include <lz4.h>
@@ -14,22 +12,20 @@
#include "core/loader/nso.h"
#include "core/memory.h"
-using Kernel::CodeSet;
-using Kernel::SharedPtr;
-
namespace Loader {
-FileType AppLoader_NSO::IdentifyType(FileUtil::IOFile& file) {
- u32 magic = 0;
- file.Seek(0, SEEK_SET);
- if (1 != file.ReadArray<u32>(&magic, 1))
- return FileType::Error;
+enum class RelocationType : u32 { ABS64 = 257, GLOB_DAT = 1025, JUMP_SLOT = 1026, RELATIVE = 1027 };
- if (MakeMagic('N', 'S', 'O', '0') == magic)
- return FileType::NSO;
-
- return FileType::Error;
-}
+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;
@@ -42,13 +38,40 @@ static_assert(sizeof(NsoSegmentHeader) == 0x10, "NsoSegmentHeader has incorrect
struct NsoHeader {
u32_le magic;
INSERT_PADDING_BYTES(0xc);
- std::array<NsoSegmentHeader, 3> segments; // Text, Data, RoData (in that order)
- INSERT_PADDING_BYTES(0x20);
+ std::array<NsoSegmentHeader, 3> segments; // Text, RoData, Data (in that order)
+ u32_le bss_size;
+ INSERT_PADDING_BYTES(0x1c);
std::array<u32_le, 3> segments_compressed_size;
};
-
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;
+ 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) == 0x24, "ModHeader has incorrect size.");
+
+FileType AppLoader_NSO::IdentifyType(FileUtil::IOFile& file) {
+ u32 magic = 0;
+ file.Seek(0, SEEK_SET);
+ if (1 != file.ReadArray<u32>(&magic, 1)) {
+ return FileType::Error;
+ }
+
+ if (MakeMagic('N', 'S', 'O', '0') == magic) {
+ return FileType::NSO;
+ }
+
+ return FileType::Error;
+}
+
static std::vector<u8> ReadSegment(FileUtil::IOFile& file, const NsoSegmentHeader& header,
int compressed_size) {
std::vector<u8> compressed_data;
@@ -72,40 +95,10 @@ static std::vector<u8> ReadSegment(FileUtil::IOFile& file, const NsoSegmentHeade
return uncompressed_data;
}
-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;
-};
-
-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,
-};
-
-void WriteRelocations(const std::vector<Symbol>& symbols, VAddr loadbase, u64 roff, u64 size,
- bool is_jump_relocation, std::map<std::string, Import>& imports,
- std::map<std::string, VAddr>& exports) {
+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 = loadbase + roff + i;
+ 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);
@@ -114,16 +107,16 @@ void WriteRelocations(const std::vector<Symbol>& symbols, VAddr loadbase, u64 ro
RelocationType rtype = static_cast<RelocationType>(info & 0xFFFFFFFF);
u32 rsym = static_cast<u32>(info >> 32);
- VAddr ea = loadbase + offset;
+ VAddr ea = load_base + offset;
const Symbol& symbol = symbols[rsym];
switch (rtype) {
case RelocationType::RELATIVE:
if (!symbol.name.empty()) {
- exports[symbol.name] = loadbase + addend;
+ exports[symbol.name] = load_base + addend;
}
- Memory::Write64(ea, loadbase + addend);
+ Memory::Write64(ea, load_base + addend);
break;
case RelocationType::JUMP_SLOT:
case RelocationType::GLOB_DAT:
@@ -149,18 +142,12 @@ void WriteRelocations(const std::vector<Symbol>& symbols, VAddr loadbase, u64 ro
}
}
-void Relocate(VAddr loadbase, std::map<std::string, Import>& imports,
- std::map<std::string, VAddr>& exports) {
- u32 modoff = Memory::Read32(loadbase + 4);
- ASSERT_MSG(Memory::Read32(loadbase + modoff) == MakeMagic('M', 'O', 'D', '0'),
- "Expected MOD section");
-
- u64 dynoff = loadbase + modoff + Memory::Read32(loadbase + modoff + 4);
+void AppLoader_NSO::Relocate(VAddr load_base, VAddr dynamic_section_addr) {
std::map<u64, u64> dynamic;
while (1) {
- u64 tag = Memory::Read64(dynoff);
- u64 value = Memory::Read64(dynoff + 8);
- dynoff += 16;
+ u64 tag = Memory::Read64(dynamic_section_addr);
+ u64 value = Memory::Read64(dynamic_section_addr + 8);
+ dynamic_section_addr += 16;
if (tag == DT_NULL) {
break;
@@ -171,9 +158,9 @@ void Relocate(VAddr loadbase, std::map<std::string, Import>& imports,
u64 strtabsize = dynamic[DT_STRSZ];
std::vector<u8> strtab;
strtab.resize(strtabsize);
- Memory::ReadBlock(loadbase + dynamic[DT_STRTAB], strtab.data(), strtabsize);
+ Memory::ReadBlock(load_base + dynamic[DT_STRTAB], strtab.data(), strtabsize);
- VAddr addr = loadbase + dynamic[DT_SYMTAB];
+ VAddr addr = load_base + dynamic[DT_SYMTAB];
std::vector<Symbol> symbols;
while (1) {
const u32 stname = Memory::Read32(addr);
@@ -187,96 +174,108 @@ void Relocate(VAddr loadbase, std::map<std::string, Import>& imports,
std::string name = reinterpret_cast<char*>(&strtab[stname]);
if (stvalue) {
- exports[name] = loadbase + stvalue;
- symbols.emplace_back(std::move(name), loadbase + 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, loadbase, dynamic[DT_RELA], dynamic[DT_RELASZ], false, imports,
- exports);
+ WriteRelocations(symbols, load_base, dynamic[DT_RELA], dynamic[DT_RELASZ], false);
}
if (dynamic.find(DT_JMPREL) != dynamic.end()) {
- WriteRelocations(symbols, loadbase, dynamic[DT_JMPREL], dynamic[DT_PLTRELSZ], true, imports,
- exports);
+ WriteRelocations(symbols, load_base, dynamic[DT_JMPREL], dynamic[DT_PLTRELSZ], true);
}
}
-static VAddr GetEntryPoint(const std::map<std::string, VAddr>& exports) {
+VAddr AppLoader_NSO::GetEntryPoint() const {
// Find nnMain function, set entrypoint to that address
const auto& search = exports.find("nnMain");
if (search != exports.end()) {
return search->second;
}
+ ASSERT_MSG(false, "Unable to find entrypoint");
return {};
}
-static SharedPtr<CodeSet> LoadModule(const std::string& filepath, VAddr loadbase,
- std::map<std::string, Import>& imports,
- std::map<std::string, VAddr>& exports) {
- FileUtil::IOFile file(filepath, "rb");
+static constexpr u32 PageAlignSize(u32 size) {
+ return (size + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
+}
- if (!file.IsOpen())
+bool AppLoader_NSO::LoadNso(const std::string& path, VAddr load_base) {
+ FileUtil::IOFile file(path, "rb");
+ if (!file.IsOpen()) {
return {};
+ }
- NsoHeader header{};
+ // Read NSO header
+ NsoHeader nso_header{};
file.Seek(0, SEEK_SET);
- if (sizeof(NsoHeader) != file.ReadBytes(&header, sizeof(NsoHeader)))
+ if (sizeof(NsoHeader) != file.ReadBytes(&nso_header, sizeof(NsoHeader))) {
+ return {};
+ }
+ if (nso_header.magic != MakeMagic('N', 'S', 'O', '0')) {
return {};
+ }
// Build program image
- SharedPtr<CodeSet> codeset = CodeSet::Create("", 0);
+ Kernel::SharedPtr<Kernel::CodeSet> codeset = Kernel::CodeSet::Create("", 0);
std::vector<u8> program_image;
- for (int i = 0; i < header.segments.size(); ++i) {
+ for (int i = 0; i < nso_header.segments.size(); ++i) {
std::vector<u8> data =
- ReadSegment(file, header.segments[i], header.segments_compressed_size[i]);
- program_image.resize(header.segments[i].location);
+ ReadSegment(file, nso_header.segments[i], nso_header.segments_compressed_size[i]);
+ program_image.resize(nso_header.segments[i].location);
program_image.insert(program_image.end(), data.begin(), data.end());
- codeset->segments[i].addr = header.segments[i].location;
- codeset->segments[i].offset = header.segments[i].location;
- codeset->segments[i].size = (data.size() + Memory::PAGE_MASK) & ~Memory::PAGE_MASK;
+ codeset->segments[i].addr = nso_header.segments[i].location;
+ codeset->segments[i].offset = nso_header.segments[i].location;
+ codeset->segments[i].size = static_cast<u32>(data.size());
+ }
+
+ // Read MOD header
+ ModHeader mod_header{};
+ std::memcpy(&mod_header, program_image.data(), sizeof(ModHeader));
+ if (mod_header.magic != MakeMagic('M', 'O', 'D', '0')) {
+ return {};
}
- program_image.resize((program_image.size() + Memory::PAGE_MASK) & ~Memory::PAGE_MASK);
- codeset->name = filepath;
- codeset->entrypoint = 0; // Set after relocation
+ // Resize program image to include .bss section and page align each section
+ const u32 bss_size = mod_header.bss_end_offset - mod_header.bss_start_offset;
+ codeset->code.size = PageAlignSize(codeset->code.size);
+ codeset->rodata.size = PageAlignSize(codeset->rodata.size);
+ codeset->data.size = PageAlignSize(codeset->data.size + bss_size);
+ program_image.resize(PageAlignSize(static_cast<u32>(program_image.size()) + bss_size));
+
+ // 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(load_base, load_base + mod_header.offset_to_start + mod_header.dynamic_offset);
- return codeset;
+ return true;
}
ResultStatus AppLoader_NSO::Load() {
- if (is_loaded)
+ if (is_loaded) {
return ResultStatus::ErrorAlreadyLoaded;
-
- if (!file.IsOpen())
+ }
+ if (!file.IsOpen()) {
return ResultStatus::Error;
+ }
- static constexpr VAddr loadbase = 0x7100000000;
- std::map<std::string, Import> imports;
- std::map<std::string, VAddr> exports;
+ // Load and relocate "main" and "sdk" NSO
+ const std::string sdkpath = filepath.substr(0, filepath.find_last_of("/\\")) + "/sdk";
+ Kernel::g_current_process = Kernel::Process::Create("main");
+ if (!LoadNso(filepath, 0x10000000) || !LoadNso(sdkpath, 0x20000000)) {
+ return ResultStatus::ErrorInvalidFormat;
+ }
- // Load and relocate "main" NSO
- auto codeset = LoadModule(filepath, loadbase, imports, exports);
- Kernel::g_current_process = Kernel::Process::Create(codeset);
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->LoadModule(codeset, loadbase);
- Relocate(loadbase, imports, exports);
- codeset->entrypoint = GetEntryPoint(exports);
- Kernel::g_current_process->Run(48, Kernel::DEFAULT_STACK_SIZE);
-
- // Load and relocate "sdk" NSO
- static constexpr VAddr sdkbase = 0x7200000000;
- const std::string sdkpath = filepath.substr(0, filepath.find_last_of("/\\")) + "/sdk";
- auto sdk_codeset = LoadModule(sdkpath, sdkbase, imports, exports);
- Kernel::g_current_process->LoadModule(sdk_codeset, sdkbase);
- Relocate(sdkbase, imports, exports);
+ Kernel::g_current_process->Run(GetEntryPoint(), 48, Kernel::DEFAULT_STACK_SIZE);
// Resolve imports
for (const auto& import : imports) {
@@ -284,7 +283,7 @@ ResultStatus AppLoader_NSO::Load() {
if (search != exports.end()) {
Memory::Write64(import.second.ea, search->second + import.second.addend);
} else {
- LOG_CRITICAL(Loader, "Unresolved import: %s", import.first.c_str());
+ LOG_ERROR(Loader, "Unresolved import: %s", import.first.c_str());
}
}