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ElfReader.h
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ElfReader.h
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// Copyright (c) 2012- PPSSPP Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
#pragma once
#include <vector>
#include "Common/CommonTypes.h"
#include "Core/ELF/ElfTypes.h"
enum {
R_MIPS_NONE,
R_MIPS_16,
R_MIPS_32,
R_MIPS_REL32,
R_MIPS_26,
R_MIPS_HI16,
R_MIPS_LO16,
R_MIPS_GPREL16,
R_MIPS_LITERAL,
R_MIPS_GOT16,
R_MIPS_PC16,
R_MIPS_CALL16,
R_MIPS_GPREL32
};
enum KnownElfTypes {
KNOWNELF_PSP = 0,
KNOWNELF_DS = 1,
KNOWNELF_GBA = 2,
};
typedef int SectionID;
class ElfReader {
public:
ElfReader(const void *ptr, size_t size) {
base = (const char*)ptr;
base32 = (const u32 *)ptr;
header = (const Elf32_Ehdr*)ptr;
segments = (const Elf32_Phdr *)(base + header->e_phoff);
sections = (const Elf32_Shdr *)(base + header->e_shoff);
size_ = size;
}
~ElfReader() {
delete[] sectionOffsets;
delete[] sectionAddrs;
}
u32 Read32(int off) const {
return base32[off >> 2];
}
// Quick accessors
ElfType GetType() const { return (ElfType)(u16)(header->e_type); }
ElfMachine GetMachine() const { return (ElfMachine)(u16)(header->e_machine); }
u32 GetEntryPoint() const { return entryPoint; }
u32 GetFlags() const { return (u32)(header->e_flags); }
int GetNumSegments() const { return (int)(header->e_phnum); }
int GetNumSections() const { return (int)(header->e_shnum); }
const char *GetSectionName(int section) const;
const u8 *GetPtr(u32 offset) const {
return (const u8*)base + offset;
}
// Note: zero is not a valid output, means unavailable.
u32 GetSectionDataOffset(int section) const {
if (section < 0 || section >= header->e_shnum)
return 0;
if (sections[section].sh_type == SHT_NOBITS)
return 0;
return sections[section].sh_offset;
}
const u8 *GetSectionDataPtr(int section) const {
u32 offset = GetSectionDataOffset(section);
if (offset == 0 || offset > size_)
return nullptr;
return GetPtr(offset);
}
const u8 *GetSegmentPtr(int segment) const {
if (segments[segment].p_offset > size_)
return nullptr;
return GetPtr(segments[segment].p_offset);
}
u32 GetSectionAddr(SectionID section) const {
return sectionAddrs[section];
}
int GetSectionSize(SectionID section) const {
return sections[section].sh_size;
}
//-1 for not found
SectionID GetSectionByName(const char *name, int firstSection = 0) const;
u32 GetSegmentPaddr(int segment) const {
return segments[segment].p_paddr;
}
u32 GetSegmentOffset(int segment) const {
return segments[segment].p_offset;
}
u32 GetSegmentVaddr(int segment) const {
return segmentVAddr[segment];
}
u32 GetSegmentDataSize(int segment) const {
return segments[segment].p_filesz;
}
u32 GetSegmentMemSize(int segment) const {
return segments[segment].p_memsz;
}
u32 GetFirstSegmentAlign() const {
return firstSegAlign;
}
bool DidRelocate() const {
return bRelocate;
}
u32 GetVaddr() const {
return vaddr;
}
u32 GetTotalSize() const {
return totalSize;
}
u32 GetTotalTextSize() const;
u32 GetTotalTextSizeFromSeg() const;
u32 GetTotalDataSize() const;
u32 GetTotalSectionSizeByPrefix(const std::string &prefix) const;
std::vector<SectionID> GetCodeSections() const;
int LoadInto(u32 vaddr, bool fromTop);
bool LoadSymbols();
bool LoadRelocations(const Elf32_Rel *rels, int numRelocs);
void LoadRelocations2(int rel_seg);
private:
const char *base = nullptr;
const u32 *base32 = nullptr;
const Elf32_Ehdr *header = nullptr;
const Elf32_Phdr *segments = nullptr;
const Elf32_Shdr *sections = nullptr;
u32 *sectionOffsets = nullptr;
u32 *sectionAddrs = nullptr;
bool bRelocate = false;
u32 entryPoint = 0;
u32 totalSize = 0;
u32 vaddr = 0;
u32 segmentVAddr[32]{};
size_t size_ = 0;
u32 firstSegAlign = 0;
};