added Dolphin's ELF reader to the project
This commit is contained in:
bunnei
parent
e0cfd6b0b8
commit
872d9ae87f
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// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#include <string>
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#include "common.h"
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#include "mem_map.h"
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#include "elf/elf_reader.h"
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//#include "Core/Debugger/Debugger_SymbolMap.h"
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//#include "Core/HW/Memmap.h"
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//#include "Core/PowerPC/PPCSymbolDB.h"
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//void bswap(Elf32_Word &w) {w = Common::swap32(w);}
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//void bswap(Elf32_Half &w) {w = Common::swap16(w);}
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#define bswap(w) w // Dirty bswap disable for now... 3DS is little endian, anyway
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static void byteswapHeader(Elf32_Ehdr &ELF_H)
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{
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bswap(ELF_H.e_type);
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bswap(ELF_H.e_machine);
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bswap(ELF_H.e_ehsize);
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bswap(ELF_H.e_phentsize);
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bswap(ELF_H.e_phnum);
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bswap(ELF_H.e_shentsize);
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bswap(ELF_H.e_shnum);
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bswap(ELF_H.e_shstrndx);
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bswap(ELF_H.e_version);
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bswap(ELF_H.e_entry);
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bswap(ELF_H.e_phoff);
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bswap(ELF_H.e_shoff);
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bswap(ELF_H.e_flags);
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}
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static void byteswapSegment(Elf32_Phdr &sec)
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{
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bswap(sec.p_align);
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bswap(sec.p_filesz);
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bswap(sec.p_flags);
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bswap(sec.p_memsz);
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bswap(sec.p_offset);
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bswap(sec.p_paddr);
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bswap(sec.p_vaddr);
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bswap(sec.p_type);
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}
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static void byteswapSection(Elf32_Shdr &sec)
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{
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bswap(sec.sh_addr);
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bswap(sec.sh_addralign);
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bswap(sec.sh_entsize);
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bswap(sec.sh_flags);
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bswap(sec.sh_info);
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bswap(sec.sh_link);
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bswap(sec.sh_name);
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bswap(sec.sh_offset);
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bswap(sec.sh_size);
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bswap(sec.sh_type);
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}
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ElfReader::ElfReader(void *ptr)
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{
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base = (char*)ptr;
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base32 = (u32 *)ptr;
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header = (Elf32_Ehdr*)ptr;
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byteswapHeader(*header);
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segments = (Elf32_Phdr *)(base + header->e_phoff);
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sections = (Elf32_Shdr *)(base + header->e_shoff);
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for (int i = 0; i < GetNumSegments(); i++)
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{
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byteswapSegment(segments[i]);
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}
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for (int i = 0; i < GetNumSections(); i++)
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{
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byteswapSection(sections[i]);
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}
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entryPoint = header->e_entry;
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}
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const char *ElfReader::GetSectionName(int section) const
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{
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if (sections[section].sh_type == SHT_NULL)
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return nullptr;
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int nameOffset = sections[section].sh_name;
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char *ptr = (char*)GetSectionDataPtr(header->e_shstrndx);
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if (ptr)
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return ptr + nameOffset;
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else
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return nullptr;
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}
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bool ElfReader::LoadInto(u32 vaddr)
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{
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DEBUG_LOG(MASTER_LOG,"String section: %i", header->e_shstrndx);
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// sectionOffsets = new u32[GetNumSections()];
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// sectionAddrs = new u32[GetNumSections()];
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// Should we relocate?
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bRelocate = (header->e_type != ET_EXEC);
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if (bRelocate)
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{
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DEBUG_LOG(MASTER_LOG,"Relocatable module");
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entryPoint += vaddr;
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}
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else
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{
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DEBUG_LOG(MASTER_LOG,"Prerelocated executable");
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}
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INFO_LOG(MASTER_LOG,"%i segments:", header->e_phnum);
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// First pass : Get the bits into RAM
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u32 segmentVAddr[32];
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u32 baseAddress = bRelocate?vaddr:0;
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for (int i = 0; i < header->e_phnum; i++)
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{
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Elf32_Phdr *p = segments + i;
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INFO_LOG(MASTER_LOG, "Type: %i Vaddr: %08x Filesz: %i Memsz: %i ", p->p_type, p->p_vaddr, p->p_filesz, p->p_memsz);
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if (p->p_type == PT_LOAD)
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{
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segmentVAddr[i] = baseAddress + p->p_vaddr;
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u32 writeAddr = segmentVAddr[i];
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const u8 *src = GetSegmentPtr(i);
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u8 *dst = Memory::GetPointer(writeAddr);
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u32 srcSize = p->p_filesz;
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u32 dstSize = p->p_memsz;
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u32 *s = (u32*)src;
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u32 *d = (u32*)dst;
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for (int j = 0; j < (int)(srcSize + 3) / 4; j++)
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{
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*d++ = /*_byteswap_ulong*/(*s++);
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}
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if (srcSize < dstSize)
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{
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//memset(dst + srcSize, 0, dstSize-srcSize); //zero out bss
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}
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INFO_LOG(MASTER_LOG,"Loadable Segment Copied to %08x, size %08x", writeAddr, p->p_memsz);
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}
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}
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/*
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LOG(MASTER_LOG,"%i sections:", header->e_shnum);
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for (int i=0; i<GetNumSections(); i++)
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{
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Elf32_Shdr *s = §ions[i];
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const char *name = GetSectionName(i);
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u32 writeAddr = s->sh_addr + baseAddress;
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sectionOffsets[i] = writeAddr - vaddr;
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sectionAddrs[i] = writeAddr;
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if (s->sh_flags & SHF_ALLOC)
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{
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LOG(MASTER_LOG,"Data Section found: %s Sitting at %08x, size %08x", name, writeAddr, s->sh_size);
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}
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else
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{
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LOG(MASTER_LOG,"NonData Section found: %s Ignoring (size=%08x) (flags=%08x)", name, s->sh_size, s->sh_flags);
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}
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}
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*/
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INFO_LOG(MASTER_LOG,"Done loading.");
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return true;
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}
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SectionID ElfReader::GetSectionByName(const char *name, int firstSection) const
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{
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for (int i = firstSection; i < header->e_shnum; i++)
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{
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const char *secname = GetSectionName(i);
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if (secname != nullptr && strcmp(name, secname) == 0)
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return i;
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}
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return -1;
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}
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/* TODO(bunnei): The following is verbatim from Dolphin - needs to be updated for this project:
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bool ElfReader::LoadSymbols()
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{
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bool hasSymbols = false;
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SectionID sec = GetSectionByName(".symtab");
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if (sec != -1)
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{
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int stringSection = sections[sec].sh_link;
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const char *stringBase = (const char *)GetSectionDataPtr(stringSection);
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//We have a symbol table!
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Elf32_Sym *symtab = (Elf32_Sym *)(GetSectionDataPtr(sec));
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int numSymbols = sections[sec].sh_size / sizeof(Elf32_Sym);
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for (int sym = 0; sym < numSymbols; sym++)
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{
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int size = Common::swap32(symtab[sym].st_size);
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if (size == 0)
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continue;
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// int bind = symtab[sym].st_info >> 4;
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int type = symtab[sym].st_info & 0xF;
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int sectionIndex = Common::swap16(symtab[sym].st_shndx);
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int value = Common::swap32(symtab[sym].st_value);
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const char *name = stringBase + Common::swap32(symtab[sym].st_name);
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if (bRelocate)
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value += sectionAddrs[sectionIndex];
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int symtype = Symbol::SYMBOL_DATA;
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switch (type)
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{
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case STT_OBJECT:
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symtype = Symbol::SYMBOL_DATA; break;
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case STT_FUNC:
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symtype = Symbol::SYMBOL_FUNCTION; break;
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default:
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continue;
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}
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g_symbolDB.AddKnownSymbol(value, size, name, symtype);
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hasSymbols = true;
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}
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}
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g_symbolDB.Index();
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return hasSymbols;
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}
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*/
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// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#pragma once
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#include "elf/elf_types.h"
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enum KnownElfTypes
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{
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KNOWNELF_PSP = 0,
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KNOWNELF_DS = 1,
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KNOWNELF_GBA = 2,
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KNOWNELF_GC = 3,
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};
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typedef int SectionID;
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class ElfReader
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{
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private:
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char *base;
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u32 *base32;
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Elf32_Ehdr *header;
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Elf32_Phdr *segments;
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Elf32_Shdr *sections;
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u32 *sectionAddrs;
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bool bRelocate;
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u32 entryPoint;
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public:
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ElfReader(void *ptr);
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~ElfReader() { }
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u32 Read32(int off) const { return base32[off>>2]; }
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// Quick accessors
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ElfType GetType() const { return (ElfType)(header->e_type); }
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ElfMachine GetMachine() const { return (ElfMachine)(header->e_machine); }
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u32 GetEntryPoint() const { return entryPoint; }
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u32 GetFlags() const { return (u32)(header->e_flags); }
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bool LoadInto(u32 vaddr);
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bool LoadSymbols();
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int GetNumSegments() const { return (int)(header->e_phnum); }
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int GetNumSections() const { return (int)(header->e_shnum); }
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const u8 *GetPtr(int offset) const { return (u8*)base + offset; }
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const char *GetSectionName(int section) const;
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const u8 *GetSectionDataPtr(int section) const
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{
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if (section < 0 || section >= header->e_shnum)
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return nullptr;
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if (sections[section].sh_type != SHT_NOBITS)
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return GetPtr(sections[section].sh_offset);
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else
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return nullptr;
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}
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bool IsCodeSection(int section) const
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{
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return sections[section].sh_type == SHT_PROGBITS;
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}
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const u8 *GetSegmentPtr(int segment)
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{
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return GetPtr(segments[segment].p_offset);
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}
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u32 GetSectionAddr(SectionID section) const { return sectionAddrs[section]; }
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int GetSectionSize(SectionID section) const { return sections[section].sh_size; }
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SectionID GetSectionByName(const char *name, int firstSection = 0) const; //-1 for not found
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bool DidRelocate() {
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return bRelocate;
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}
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};
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@ -0,0 +1,281 @@
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// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#pragma once
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// ELF Header Constants
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// File type
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enum ElfType
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{
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ET_NONE = 0,
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ET_REL = 1,
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ET_EXEC = 2,
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ET_DYN = 3,
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ET_CORE = 4,
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ET_LOPROC = 0xFF00,
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ET_HIPROC = 0xFFFF,
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};
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// Machine/Architecture
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enum ElfMachine
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{
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EM_NONE = 0,
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EM_M32 = 1,
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EM_SPARC = 2,
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EM_386 = 3,
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EM_68K = 4,
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EM_88K = 5,
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EM_860 = 7,
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EM_MIPS = 8
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};
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// File version
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#define EV_NONE 0
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#define EV_CURRENT 1
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// Identification index
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#define EI_MAG0 0
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#define EI_MAG1 1
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#define EI_MAG2 2
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#define EI_MAG3 3
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#define EI_CLASS 4
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#define EI_DATA 5
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#define EI_VERSION 6
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#define EI_PAD 7
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#define EI_NIDENT 16
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// Magic number
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#define ELFMAG0 0x7F
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#define ELFMAG1 'E'
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#define ELFMAG2 'L'
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#define ELFMAG3 'F'
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// File class
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#define ELFCLASSNONE 0
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#define ELFCLASS32 1
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#define ELFCLASS64 2
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// Encoding
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#define ELFDATANONE 0
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#define ELFDATA2LSB 1
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#define ELFDATA2MSB 2
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// Sections constants
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// Section indexes
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#define SHN_UNDEF 0
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#define SHN_LORESERVE 0xFF00
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#define SHN_LOPROC 0xFF00
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#define SHN_HIPROC 0xFF1F
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#define SHN_ABS 0xFFF1
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#define SHN_COMMON 0xFFF2
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#define SHN_HIRESERVE 0xFFFF
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// Section types
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#define SHT_NULL 0
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#define SHT_PROGBITS 1
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#define SHT_SYMTAB 2
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#define SHT_STRTAB 3
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#define SHT_RELA 4
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#define SHT_HASH 5
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#define SHT_DYNAMIC 6
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#define SHT_NOTE 7
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#define SHT_NOBITS 8
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#define SHT_REL 9
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#define SHT_SHLIB 10
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#define SHT_DYNSYM 11
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#define SHT_LOPROC 0x70000000
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#define SHT_HIPROC 0x7FFFFFFF
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#define SHT_LOUSER 0x80000000
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#define SHT_HIUSER 0xFFFFFFFF
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// Custom section types
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#define SHT_PSPREL 0x700000a0
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// Section flags
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enum ElfSectionFlags
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{
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SHF_WRITE = 0x1,
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SHF_ALLOC = 0x2,
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SHF_EXECINSTR = 0x4,
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SHF_MASKPROC = 0xF0000000,
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};
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// Symbol binding
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#define STB_LOCAL 0
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#define STB_GLOBAL 1
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#define STB_WEAK 2
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#define STB_LOPROC 13
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#define STB_HIPROC 15
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// Symbol types
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#define STT_NOTYPE 0
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#define STT_OBJECT 1
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#define STT_FUNC 2
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#define STT_SECTION 3
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#define STT_FILE 4
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#define STT_LOPROC 13
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#define STT_HIPROC 15
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// Undefined name
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#define STN_UNDEF 0
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// Relocation types
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#define R_386_NONE 0
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#define R_386_32 1
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#define R_386_PC32 2
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#define R_386_GOT32 3
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#define R_386_PLT32 4
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#define R_386_COPY 5
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#define R_386_GLOB_DAT 6
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#define R_386_JMP_SLOT 7
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#define R_386_RELATIVE 8
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#define R_386_GOTOFF 9
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#define R_386_GOTPC 10
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// Segment types
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#define PT_NULL 0
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#define PT_LOAD 1
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#define PT_DYNAMIC 2
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#define PT_INTERP 3
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#define PT_NOTE 4
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#define PT_SHLIB 5
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#define PT_PHDR 6
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#define PT_LOPROC 0x70000000
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#define PT_HIPROC 0x7FFFFFFF
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// Segment flags
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#define PF_X 1
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#define PF_W 2
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#define PF_R 4
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// Dynamic Array Tags
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#define DT_NULL 0
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#define DT_NEEDED 1
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#define DT_PLTRELSZ 2
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#define DT_PLTGOT 3
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#define DT_HASH 4
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#define DT_STRTAB 5
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#define DT_SYMTAB 6
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#define DT_RELA 7
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#define DT_RELASZ 8
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#define DT_RELAENT 9
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#define DT_STRSZ 10
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#define DT_SYMENT 11
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#define DT_INIT 12
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#define DT_FINI 13
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#define DT_SONAME 14
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#define DT_RPATH 15
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#define DT_SYMBOLIC 16
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#define DT_REL 17
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#define DT_RELSZ 18
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#define DT_RELENT 19
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#define DT_PLTREL 20
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#define DT_DEBUG 21
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#define DT_TEXTREL 22
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#define DT_JMPREL 23
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#define DT_LOPROC 0x70000000
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#define DT_HIPROC 0x7FFFFFFF
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||||
|
||||
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;
|
||||
};
|
||||
|
||||
#define ELF32_ST_BIND(i) ((i)>>4)
|
||||
#define ELF32_ST_TYPE(i) ((i)&0xf)
|
||||
#define ELF32_ST_INFO(b,t) (((b)<<4)+((t)&0xf))
|
||||
|
||||
// Relocation entries
|
||||
struct Elf32_Rel
|
||||
{
|
||||
Elf32_Addr r_offset;
|
||||
Elf32_Word r_info;
|
||||
};
|
||||
|
||||
struct Elf32_Rela
|
||||
{
|
||||
Elf32_Addr r_offset;
|
||||
Elf32_Word r_info;
|
||||
Elf32_Sword r_addend;
|
||||
};
|
||||
|
||||
#define ELF32_R_SYM(i) ((i)>>8)
|
||||
#define ELF32_R_TYPE(i) ((unsigned char)(i))
|
||||
#define ELF32_R_INFO(s,t) (((s)<<8 )+(unsigned char)(t))
|
||||
|
||||
|
||||
struct Elf32_Dyn
|
||||
{
|
||||
Elf32_Sword d_tag;
|
||||
union
|
||||
{
|
||||
Elf32_Word d_val;
|
||||
Elf32_Addr d_ptr;
|
||||
} d_un;
|
||||
};
|
||||
Reference in New Issue