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Loader: Implemented AppLoader interface for abstracting application loading.

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- Various cleanups/refactorings to Loader, ELF, and NCCH modules.
- Added AppLoader interface to ELF and NCCH.
- Updated Qt/GLFW frontends to check AppLoader ResultStatus.

NCCH: Removed extra qualification typos.

Loader: Removed unnecessary #include's.

NCCH: Improved readability of memcmp statements.

NCCH: Added missing space.

Elf: Removed unnecessary usage of unique_ptr.

Loader: Removed unnecessary usage of unique_ptr.
This commit is contained in:
bunnei 2014-06-18 18:58:09 -04:00
parent 79a48082e2
commit 7889cafc76
8 changed files with 690 additions and 551 deletions
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232
src/core/loader/elf.h
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@ -5,226 +5,28 @@
#pragma once
#include "common/common_types.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;
};
typedef int SectionID;
class ElfReader {
private:
char *base;
u32 *base32;
Elf32_Ehdr *header;
Elf32_Phdr *segments;
Elf32_Shdr *sections;
u32 *sectionAddrs;
bool bRelocate;
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 bRelocate;
}
};
#include "core/loader/loader.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
// Loader namespace
namespace Loader {
/**
* Loads an ELF file
* @param filename String filename of ELF file
* @param error_string Pointer to string to put error message if an error has occurred
* @return True on success, otherwise false
*/
bool Load_ELF(std::string& filename, std::string* error_string);
/// Loads an ELF/AXF file
class AppLoader_ELF : public AppLoader {
public:
AppLoader_ELF(std::string& filename);
~AppLoader_ELF();
/**
* Load the bootable file
* @return ResultStatus result of function
*/
const ResultStatus Load();
private:
std::string filename;
bool is_loaded;
};
} // namespace Loader