mirror of
https://git.suyu.dev/suyu/suyu.git
synced 2024-11-25 22:57:22 +00:00
370 lines
9.5 KiB
C++
370 lines
9.5 KiB
C++
// Copyright 2013 Dolphin Emulator Project
|
|
// Licensed under GPLv2
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <string>
|
|
#include <memory>
|
|
|
|
#include "common/common.h"
|
|
#include "common/file_util.h"
|
|
#include "common/symbols.h"
|
|
|
|
#include "core/mem_map.h"
|
|
#include "core/loader/elf.h"
|
|
#include "core/hle/kernel/kernel.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
|
|
|
|
// Magic number
|
|
#define ELFMAG0 0x7F
|
|
#define ELFMAG1 'E'
|
|
#define ELFMAG2 'L'
|
|
#define ELFMAG3 'F'
|
|
|
|
// 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
|
|
|
|
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;
|
|
u32 entryPoint;
|
|
|
|
public:
|
|
ElfReader(void *ptr);
|
|
~ElfReader() { }
|
|
|
|
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); }
|
|
u32 GetEntryPoint() const { return entryPoint; }
|
|
u32 GetFlags() const { return (u32)(header->e_flags); }
|
|
bool LoadInto(u32 vaddr);
|
|
bool LoadSymbols();
|
|
|
|
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]; }
|
|
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() {
|
|
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;
|
|
|
|
LoadSymbols();
|
|
}
|
|
|
|
const char *ElfReader::GetSectionName(int section) const {
|
|
if (sections[section].sh_type == SHT_NULL)
|
|
return nullptr;
|
|
|
|
int name_offset = sections[section].sh_name;
|
|
char *ptr = (char*)GetSectionDataPtr(header->e_shstrndx);
|
|
|
|
if (ptr)
|
|
return ptr + name_offset;
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
bool ElfReader::LoadInto(u32 vaddr) {
|
|
DEBUG_LOG(MASTER_LOG, "String section: %i", header->e_shstrndx);
|
|
|
|
// Should we relocate?
|
|
relocate = (header->e_type != ET_EXEC);
|
|
|
|
if (relocate) {
|
|
DEBUG_LOG(MASTER_LOG, "Relocatable module");
|
|
entryPoint += vaddr;
|
|
} else {
|
|
DEBUG_LOG(MASTER_LOG, "Prerelocated executable");
|
|
}
|
|
INFO_LOG(MASTER_LOG, "%i segments:", header->e_phnum);
|
|
|
|
// First pass : Get the bits into RAM
|
|
u32 segment_addr[32];
|
|
u32 base_addr = relocate ? vaddr : 0;
|
|
|
|
for (int i = 0; i < header->e_phnum; i++) {
|
|
Elf32_Phdr *p = segments + i;
|
|
INFO_LOG(MASTER_LOG, "Type: %i Vaddr: %08x Filesz: %i Memsz: %i ", p->p_type, p->p_vaddr,
|
|
p->p_filesz, p->p_memsz);
|
|
|
|
if (p->p_type == PT_LOAD) {
|
|
segment_addr[i] = base_addr + p->p_vaddr;
|
|
memcpy(Memory::GetPointer(segment_addr[i]), GetSegmentPtr(i), p->p_filesz);
|
|
INFO_LOG(MASTER_LOG, "Loadable Segment Copied to %08x, size %08x", segment_addr[i],
|
|
p->p_memsz);
|
|
}
|
|
}
|
|
INFO_LOG(MASTER_LOG, "Done loading.");
|
|
return true;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
bool ElfReader::LoadSymbols() {
|
|
bool hasSymbols = false;
|
|
SectionID sec = GetSectionByName(".symtab");
|
|
if (sec != -1) {
|
|
int stringSection = sections[sec].sh_link;
|
|
const char *stringBase = (const char *)GetSectionDataPtr(stringSection);
|
|
|
|
//We have a symbol table!
|
|
Elf32_Sym *symtab = (Elf32_Sym *)(GetSectionDataPtr(sec));
|
|
int numSymbols = sections[sec].sh_size / sizeof(Elf32_Sym);
|
|
for (int sym = 0; sym < numSymbols; sym++) {
|
|
int size = symtab[sym].st_size;
|
|
if (size == 0)
|
|
continue;
|
|
|
|
int type = symtab[sym].st_info & 0xF;
|
|
|
|
const char *name = stringBase + symtab[sym].st_name;
|
|
|
|
Symbols::Add(symtab[sym].st_value, name, size, type);
|
|
|
|
hasSymbols = true;
|
|
}
|
|
}
|
|
|
|
return hasSymbols;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
// Loader namespace
|
|
|
|
namespace Loader {
|
|
|
|
/// AppLoader_ELF constructor
|
|
AppLoader_ELF::AppLoader_ELF(const std::string& filename) : is_loaded(false) {
|
|
this->filename = filename;
|
|
}
|
|
|
|
/// AppLoader_NCCH destructor
|
|
AppLoader_ELF::~AppLoader_ELF() {
|
|
}
|
|
|
|
/**
|
|
* Loads an NCCH file (e.g. from a CCI, or the first NCCH in a CXI)
|
|
* @param error_string Pointer to string to put error message if an error has occurred
|
|
* @todo Move NCSD parsing out of here and create a separate function for loading these
|
|
* @return True on success, otherwise false
|
|
*/
|
|
ResultStatus AppLoader_ELF::Load() {
|
|
INFO_LOG(LOADER, "Loading ELF file %s...", filename.c_str());
|
|
|
|
if (is_loaded)
|
|
return ResultStatus::ErrorAlreadyLoaded;
|
|
|
|
FileUtil::IOFile file(filename, "rb");
|
|
|
|
if (file.IsOpen()) {
|
|
u32 size = (u32)file.GetSize();
|
|
std::unique_ptr<u8[]> buffer(new u8[size]);
|
|
file.ReadBytes(&buffer[0], size);
|
|
|
|
ElfReader elf_reader(&buffer[0]);
|
|
elf_reader.LoadInto(0x00100000);
|
|
Kernel::LoadExec(elf_reader.GetEntryPoint());
|
|
} else {
|
|
return ResultStatus::Error;
|
|
}
|
|
return ResultStatus::Success;
|
|
}
|
|
|
|
} // namespace Loader
|