diff options
Diffstat (limited to 'src/core/loader/elf.cpp')
| -rw-r--r-- | src/core/loader/elf.cpp | 414 |
1 files changed, 0 insertions, 414 deletions
diff --git a/src/core/loader/elf.cpp b/src/core/loader/elf.cpp deleted file mode 100644 index d0250bdb4..000000000 --- a/src/core/loader/elf.cpp +++ /dev/null @@ -1,414 +0,0 @@ -// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project -// Licensed under GPLv2 or any later version -// Refer to the license.txt file included. - -#include <cstring> -#include <memory> -#include "common/common_funcs.h" -#include "common/common_types.h" -#include "common/logging/log.h" -#include "core/hle/kernel/code_set.h" -#include "core/hle/kernel/k_page_table.h" -#include "core/hle/kernel/k_process.h" -#include "core/loader/elf.h" -#include "core/memory.h" - -//////////////////////////////////////////////////////////////////////////////////////////////////// -// ELF Header Constants - -// File type -enum ElfType { - ET_NONE = 0, - ET_REL = 1, - ET_EXEC = 2, - ET_DYN = 3, - ET_CORE = 4, - ET_LOPROC = 0xFF00, - ET_HIPROC = 0xFFFF, -}; - -// Machine/Architecture -enum ElfMachine { - EM_NONE = 0, - EM_M32 = 1, - EM_SPARC = 2, - EM_386 = 3, - EM_68K = 4, - EM_88K = 5, - EM_860 = 7, - EM_MIPS = 8 -}; - -// File version -#define EV_NONE 0 -#define EV_CURRENT 1 - -// Identification index -#define EI_MAG0 0 -#define EI_MAG1 1 -#define EI_MAG2 2 -#define EI_MAG3 3 -#define EI_CLASS 4 -#define EI_DATA 5 -#define EI_VERSION 6 -#define EI_PAD 7 -#define EI_NIDENT 16 - -// Sections constants - -// Section types -#define SHT_NULL 0 -#define SHT_PROGBITS 1 -#define SHT_SYMTAB 2 -#define SHT_STRTAB 3 -#define SHT_RELA 4 -#define SHT_HASH 5 -#define SHT_DYNAMIC 6 -#define SHT_NOTE 7 -#define SHT_NOBITS 8 -#define SHT_REL 9 -#define SHT_SHLIB 10 -#define SHT_DYNSYM 11 -#define SHT_LOPROC 0x70000000 -#define SHT_HIPROC 0x7FFFFFFF -#define SHT_LOUSER 0x80000000 -#define SHT_HIUSER 0xFFFFFFFF - -// Section flags -enum ElfSectionFlags { - SHF_WRITE = 0x1, - SHF_ALLOC = 0x2, - SHF_EXECINSTR = 0x4, - SHF_MASKPROC = 0xF0000000, -}; - -// Segment types -#define PT_NULL 0 -#define PT_LOAD 1 -#define PT_DYNAMIC 2 -#define PT_INTERP 3 -#define PT_NOTE 4 -#define PT_SHLIB 5 -#define PT_PHDR 6 -#define PT_LOPROC 0x70000000 -#define PT_HIPROC 0x7FFFFFFF - -// Segment flags -#define PF_X 0x1 -#define PF_W 0x2 -#define PF_R 0x4 -#define PF_MASKPROC 0xF0000000 - -typedef unsigned int Elf32_Addr; -typedef unsigned short Elf32_Half; -typedef unsigned int Elf32_Off; -typedef signed int Elf32_Sword; -typedef unsigned int Elf32_Word; - -//////////////////////////////////////////////////////////////////////////////////////////////////// -// ELF file header - -struct Elf32_Ehdr { - unsigned char e_ident[EI_NIDENT]; - Elf32_Half e_type; - Elf32_Half e_machine; - Elf32_Word e_version; - Elf32_Addr e_entry; - Elf32_Off e_phoff; - Elf32_Off e_shoff; - Elf32_Word e_flags; - Elf32_Half e_ehsize; - Elf32_Half e_phentsize; - Elf32_Half e_phnum; - Elf32_Half e_shentsize; - Elf32_Half e_shnum; - Elf32_Half e_shstrndx; -}; - -// Section header -struct Elf32_Shdr { - Elf32_Word sh_name; - Elf32_Word sh_type; - Elf32_Word sh_flags; - Elf32_Addr sh_addr; - Elf32_Off sh_offset; - Elf32_Word sh_size; - Elf32_Word sh_link; - Elf32_Word sh_info; - Elf32_Word sh_addralign; - Elf32_Word sh_entsize; -}; - -// Segment header -struct Elf32_Phdr { - Elf32_Word p_type; - Elf32_Off p_offset; - Elf32_Addr p_vaddr; - Elf32_Addr p_paddr; - Elf32_Word p_filesz; - Elf32_Word p_memsz; - Elf32_Word p_flags; - Elf32_Word p_align; -}; - -// Symbol table entry -struct Elf32_Sym { - Elf32_Word st_name; - Elf32_Addr st_value; - Elf32_Word st_size; - unsigned char st_info; - unsigned char st_other; - Elf32_Half st_shndx; -}; - -// Relocation entries -struct Elf32_Rel { - Elf32_Addr r_offset; - Elf32_Word r_info; -}; - -//////////////////////////////////////////////////////////////////////////////////////////////////// -// ElfReader class - -typedef int SectionID; - -class ElfReader { -private: - char* base; - u32* base32; - - Elf32_Ehdr* header; - Elf32_Phdr* segments; - Elf32_Shdr* sections; - - u32* sectionAddrs; - bool relocate; - VAddr entryPoint; - -public: - explicit ElfReader(void* ptr); - - u32 Read32(int off) const { - return base32[off >> 2]; - } - - // Quick accessors - ElfType GetType() const { - return (ElfType)(header->e_type); - } - ElfMachine GetMachine() const { - return (ElfMachine)(header->e_machine); - } - VAddr GetEntryPoint() const { - return entryPoint; - } - u32 GetFlags() const { - return (u32)(header->e_flags); - } - Kernel::CodeSet LoadInto(VAddr vaddr); - - int GetNumSegments() const { - return (int)(header->e_phnum); - } - int GetNumSections() const { - return (int)(header->e_shnum); - } - const u8* GetPtr(int offset) const { - return (u8*)base + offset; - } - const char* GetSectionName(int section) const; - const u8* GetSectionDataPtr(int section) const { - if (section < 0 || section >= header->e_shnum) - return nullptr; - if (sections[section].sh_type != SHT_NOBITS) - return GetPtr(sections[section].sh_offset); - else - return nullptr; - } - bool IsCodeSection(int section) const { - return sections[section].sh_type == SHT_PROGBITS; - } - const u8* GetSegmentPtr(int segment) { - return GetPtr(segments[segment].p_offset); - } - u32 GetSectionAddr(SectionID section) const { - return sectionAddrs[section]; - } - unsigned int GetSectionSize(SectionID section) const { - return sections[section].sh_size; - } - SectionID GetSectionByName(const char* name, int firstSection = 0) const; //-1 for not found - - bool DidRelocate() const { - return relocate; - } -}; - -ElfReader::ElfReader(void* ptr) { - base = (char*)ptr; - base32 = (u32*)ptr; - header = (Elf32_Ehdr*)ptr; - - segments = (Elf32_Phdr*)(base + header->e_phoff); - sections = (Elf32_Shdr*)(base + header->e_shoff); - - entryPoint = header->e_entry; -} - -const char* ElfReader::GetSectionName(int section) const { - if (sections[section].sh_type == SHT_NULL) - return nullptr; - - int name_offset = sections[section].sh_name; - const char* ptr = reinterpret_cast<const char*>(GetSectionDataPtr(header->e_shstrndx)); - - if (ptr) - return ptr + name_offset; - - return nullptr; -} - -Kernel::CodeSet ElfReader::LoadInto(VAddr vaddr) { - LOG_DEBUG(Loader, "String section: {}", header->e_shstrndx); - - // Should we relocate? - relocate = (header->e_type != ET_EXEC); - - if (relocate) { - LOG_DEBUG(Loader, "Relocatable module"); - entryPoint += vaddr; - } else { - LOG_DEBUG(Loader, "Prerelocated executable"); - } - LOG_DEBUG(Loader, "{} segments:", header->e_phnum); - - // First pass : Get the bits into RAM - const VAddr base_addr = relocate ? vaddr : 0; - - u64 total_image_size = 0; - for (unsigned int i = 0; i < header->e_phnum; ++i) { - const Elf32_Phdr* p = &segments[i]; - if (p->p_type == PT_LOAD) { - total_image_size += (p->p_memsz + 0xFFF) & ~0xFFF; - } - } - - Kernel::PhysicalMemory program_image(total_image_size); - std::size_t current_image_position = 0; - - Kernel::CodeSet codeset; - - for (unsigned int i = 0; i < header->e_phnum; ++i) { - const Elf32_Phdr* p = &segments[i]; - LOG_DEBUG(Loader, "Type: {} Vaddr: {:08X} Filesz: {:08X} Memsz: {:08X} ", p->p_type, - p->p_vaddr, p->p_filesz, p->p_memsz); - - if (p->p_type == PT_LOAD) { - Kernel::CodeSet::Segment* codeset_segment; - u32 permission_flags = p->p_flags & (PF_R | PF_W | PF_X); - if (permission_flags == (PF_R | PF_X)) { - codeset_segment = &codeset.CodeSegment(); - } else if (permission_flags == (PF_R)) { - codeset_segment = &codeset.RODataSegment(); - } else if (permission_flags == (PF_R | PF_W)) { - codeset_segment = &codeset.DataSegment(); - } else { - LOG_ERROR(Loader, "Unexpected ELF PT_LOAD segment id {} with flags {:X}", i, - p->p_flags); - continue; - } - - if (codeset_segment->size != 0) { - LOG_ERROR(Loader, - "ELF has more than one segment of the same type. Skipping extra " - "segment (id {})", - i); - continue; - } - - const VAddr segment_addr = base_addr + p->p_vaddr; - const u32 aligned_size = (p->p_memsz + 0xFFF) & ~0xFFF; - - codeset_segment->offset = current_image_position; - codeset_segment->addr = segment_addr; - codeset_segment->size = aligned_size; - - std::memcpy(program_image.data() + current_image_position, GetSegmentPtr(i), - p->p_filesz); - current_image_position += aligned_size; - } - } - - codeset.entrypoint = base_addr + header->e_entry; - codeset.memory = std::move(program_image); - - LOG_DEBUG(Loader, "Done loading."); - - return codeset; -} - -SectionID ElfReader::GetSectionByName(const char* name, int firstSection) const { - for (int i = firstSection; i < header->e_shnum; i++) { - const char* secname = GetSectionName(i); - - if (secname != nullptr && strcmp(name, secname) == 0) - return i; - } - return -1; -} - -//////////////////////////////////////////////////////////////////////////////////////////////////// -// Loader namespace - -namespace Loader { - -AppLoader_ELF::AppLoader_ELF(FileSys::VirtualFile file_) : AppLoader(std::move(file_)) {} - -FileType AppLoader_ELF::IdentifyType(const FileSys::VirtualFile& elf_file) { - static constexpr u16 ELF_MACHINE_ARM{0x28}; - - u32 magic = 0; - if (4 != elf_file->ReadObject(&magic)) { - return FileType::Error; - } - - u16 machine = 0; - if (2 != elf_file->ReadObject(&machine, 18)) { - return FileType::Error; - } - - if (Common::MakeMagic('\x7f', 'E', 'L', 'F') == magic && ELF_MACHINE_ARM == machine) { - return FileType::ELF; - } - - return FileType::Error; -} - -AppLoader_ELF::LoadResult AppLoader_ELF::Load(Kernel::KProcess& process, - [[maybe_unused]] Core::System& system) { - if (is_loaded) { - return {ResultStatus::ErrorAlreadyLoaded, {}}; - } - - std::vector<u8> buffer = file->ReadAllBytes(); - if (buffer.size() != file->GetSize()) { - return {ResultStatus::ErrorIncorrectELFFileSize, {}}; - } - - const VAddr base_address = process.PageTable().GetCodeRegionStart(); - ElfReader elf_reader(&buffer[0]); - Kernel::CodeSet codeset = elf_reader.LoadInto(base_address); - const VAddr entry_point = codeset.entrypoint; - - // Setup the process code layout - if (process.LoadFromMetadata(FileSys::ProgramMetadata::GetDefault(), buffer.size()).IsError()) { - return {ResultStatus::ErrorNotInitialized, {}}; - } - - process.LoadModule(std::move(codeset), entry_point); - - is_loaded = true; - return {ResultStatus::Success, LoadParameters{48, Core::Memory::DEFAULT_STACK_SIZE}}; -} - -} // namespace Loader |