From ab00552118eeba8330362a54ab8748916b5a5c65 Mon Sep 17 00:00:00 2001 From: Lioncash Date: Tue, 19 Mar 2019 20:45:55 -0400 Subject: [PATCH 1/2] loader: Remove Linker inheritance from NRO and NSO loaders Neither the NRO or NSO loaders actually make use of the functions or members provided by the Linker interface, so we can just remove the inheritance altogether. --- src/core/loader/nro.h | 4 ++-- src/core/loader/nso.h | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/src/core/loader/nro.h b/src/core/loader/nro.h index 013d629c0..85b0ed644 100644 --- a/src/core/loader/nro.h +++ b/src/core/loader/nro.h @@ -4,10 +4,10 @@ #pragma once +#include #include #include #include "common/common_types.h" -#include "core/loader/linker.h" #include "core/loader/loader.h" namespace FileSys { @@ -21,7 +21,7 @@ class Process; namespace Loader { /// Loads an NRO file -class AppLoader_NRO final : public AppLoader, Linker { +class AppLoader_NRO final : public AppLoader { public: explicit AppLoader_NRO(FileSys::VirtualFile file); ~AppLoader_NRO() override; diff --git a/src/core/loader/nso.h b/src/core/loader/nso.h index 135b6ea5a..167c8a694 100644 --- a/src/core/loader/nso.h +++ b/src/core/loader/nso.h @@ -6,8 +6,8 @@ #include #include "common/common_types.h" +#include "common/swap.h" #include "core/file_sys/patch_manager.h" -#include "core/loader/linker.h" #include "core/loader/loader.h" namespace Kernel { @@ -26,7 +26,7 @@ struct NSOArgumentHeader { static_assert(sizeof(NSOArgumentHeader) == 0x20, "NSOArgumentHeader has incorrect size."); /// Loads an NSO file -class AppLoader_NSO final : public AppLoader, Linker { +class AppLoader_NSO final : public AppLoader { public: explicit AppLoader_NSO(FileSys::VirtualFile file); From 1342c53e27839d53445a7518ca4c635bcc7e7a62 Mon Sep 17 00:00:00 2001 From: Lioncash Date: Tue, 19 Mar 2019 20:48:23 -0400 Subject: [PATCH 2/2] loader: Remove Linker class Given the class is now currently unused, it can be removed. --- src/core/CMakeLists.txt | 2 - src/core/loader/linker.cpp | 147 ------------------------------------- src/core/loader/linker.h | 36 --------- 3 files changed, 185 deletions(-) delete mode 100644 src/core/loader/linker.cpp delete mode 100644 src/core/loader/linker.h diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt index aee8bc27d..6319414ba 100644 --- a/src/core/CMakeLists.txt +++ b/src/core/CMakeLists.txt @@ -419,8 +419,6 @@ add_library(core STATIC loader/deconstructed_rom_directory.h loader/elf.cpp loader/elf.h - loader/linker.cpp - loader/linker.h loader/loader.cpp loader/loader.h loader/nax.cpp diff --git a/src/core/loader/linker.cpp b/src/core/loader/linker.cpp deleted file mode 100644 index 57ca8c3ee..000000000 --- a/src/core/loader/linker.cpp +++ /dev/null @@ -1,147 +0,0 @@ -// Copyright 2018 yuzu emulator team -// Licensed under GPLv2 or any later version -// Refer to the license.txt file included. - -#include - -#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& program_image, const std::vector& symbols, - u64 relocation_offset, u64 size, 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: {}", static_cast(rela.type)); - break; - } - } -} - -void Linker::Relocate(std::vector& program_image, u32 dynamic_section_offset, VAddr load_base) { - std::map 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 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(&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], load_base); - } - - if (dynamic.find(DT_JMPREL) != dynamic.end()) { - WriteRelocations(program_image, symbols, dynamic[DT_JMPREL], dynamic[DT_PLTRELSZ], - 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: {}", import.first); - } - } -} - -} // namespace Loader diff --git a/src/core/loader/linker.h b/src/core/loader/linker.h deleted file mode 100644 index 107625837..000000000 --- a/src/core/loader/linker.h +++ /dev/null @@ -1,36 +0,0 @@ -// Copyright 2018 yuzu emulator team -// Licensed under GPLv2 or any later version -// Refer to the license.txt file included. - -#pragma once - -#include -#include -#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& program_image, const std::vector& symbols, - u64 relocation_offset, u64 size, VAddr load_base); - void Relocate(std::vector& program_image, u32 dynamic_section_offset, VAddr load_base); - - void ResolveImports(); - - std::map imports; - std::map exports; -}; - -} // namespace Loader