From 1342c53e27839d53445a7518ca4c635bcc7e7a62 Mon Sep 17 00:00:00 2001 From: Lioncash Date: Tue, 19 Mar 2019 20:48:23 -0400 Subject: [PATCH] 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 aee8bc27d2..6319414bad 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 57ca8c3eeb..0000000000 --- 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 1076258377..0000000000 --- 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