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

src/core/CMakeLists.txt

@@ -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

src/core/loader/linker.cpp

@@ -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

src/core/loader/linker.h

@@ -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

src/core/loader/loader.cpp

@@ -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;
     }

src/core/loader/loader.h

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

src/core/loader/nro.cpp

@@ -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

src/core/loader/nro.h

@@ -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

src/core/loader/nso.cpp

@@ -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;

src/core/loader/nso.h

@@ -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;