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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#include <string>
#include "common/common.h"
#include "core/mem_map.h"
#include "core/elf/elf_reader.h"
//#include "Core/Debugger/Debugger_SymbolMap.h"
//#include "Core/HW/Memmap.h"
//#include "Core/PowerPC/PPCSymbolDB.h"
//void bswap(Elf32_Word &w) {w = Common::swap32(w);}
//void bswap(Elf32_Half &w) {w = Common::swap16(w);}
#define bswap(w) w // Dirty bswap disable for now... 3DS is little endian, anyway
static void byteswapHeader(Elf32_Ehdr &ELF_H)
{
bswap(ELF_H.e_type);
bswap(ELF_H.e_machine);
bswap(ELF_H.e_ehsize);
bswap(ELF_H.e_phentsize);
bswap(ELF_H.e_phnum);
bswap(ELF_H.e_shentsize);
bswap(ELF_H.e_shnum);
bswap(ELF_H.e_shstrndx);
bswap(ELF_H.e_version);
bswap(ELF_H.e_entry);
bswap(ELF_H.e_phoff);
bswap(ELF_H.e_shoff);
bswap(ELF_H.e_flags);
}
static void byteswapSegment(Elf32_Phdr &sec)
{
bswap(sec.p_align);
bswap(sec.p_filesz);
bswap(sec.p_flags);
bswap(sec.p_memsz);
bswap(sec.p_offset);
bswap(sec.p_paddr);
bswap(sec.p_vaddr);
bswap(sec.p_type);
}
static void byteswapSection(Elf32_Shdr &sec)
{
bswap(sec.sh_addr);
bswap(sec.sh_addralign);
bswap(sec.sh_entsize);
bswap(sec.sh_flags);
bswap(sec.sh_info);
bswap(sec.sh_link);
bswap(sec.sh_name);
bswap(sec.sh_offset);
bswap(sec.sh_size);
bswap(sec.sh_type);
}
ElfReader::ElfReader(void *ptr)
{
base = (char*)ptr;
base32 = (u32 *)ptr;
header = (Elf32_Ehdr*)ptr;
byteswapHeader(*header);
segments = (Elf32_Phdr *)(base + header->e_phoff);
sections = (Elf32_Shdr *)(base + header->e_shoff);
//for (int i = 0; i < GetNumSegments(); i++)
//{
// byteswapSegment(segments[i]);
//}
//for (int i = 0; i < GetNumSections(); i++)
//{
// byteswapSection(sections[i]);
//}
entryPoint = header->e_entry;
}
const char *ElfReader::GetSectionName(int section) const
{
if (sections[section].sh_type == SHT_NULL)
return nullptr;
int nameOffset = sections[section].sh_name;
char *ptr = (char*)GetSectionDataPtr(header->e_shstrndx);
if (ptr)
return ptr + nameOffset;
else
return nullptr;
}
bool ElfReader::LoadInto(u32 vaddr)
{
DEBUG_LOG(MASTER_LOG,"String section: %i", header->e_shstrndx);
// sectionOffsets = new u32[GetNumSections()];
// sectionAddrs = new u32[GetNumSections()];
// Should we relocate?
bRelocate = (header->e_type != ET_EXEC);
if (bRelocate)
{
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 segmentVAddr[32];
u32 baseAddress = bRelocate?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)
{
segmentVAddr[i] = baseAddress + p->p_vaddr;
u32 writeAddr = segmentVAddr[i];
const u8 *src = GetSegmentPtr(i);
u8 *dst = Memory::GetPointer(writeAddr);
u32 srcSize = p->p_filesz;
u32 dstSize = p->p_memsz;
u32 *s = (u32*)src;
u32 *d = (u32*)dst;
for (int j = 0; j < (int)(srcSize + 3) / 4; j++)
{
*d++ = /*_byteswap_ulong*/(*s++);
}
if (srcSize < dstSize)
{
//memset(dst + srcSize, 0, dstSize-srcSize); //zero out bss
}
INFO_LOG(MASTER_LOG,"Loadable Segment Copied to %08x, size %08x", writeAddr, p->p_memsz);
}
}
/*
LOG(MASTER_LOG,"%i sections:", header->e_shnum);
for (int i=0; i<GetNumSections(); i++)
{
Elf32_Shdr *s = §ions[i];
const char *name = GetSectionName(i);
u32 writeAddr = s->sh_addr + baseAddress;
sectionOffsets[i] = writeAddr - vaddr;
sectionAddrs[i] = writeAddr;
if (s->sh_flags & SHF_ALLOC)
{
LOG(MASTER_LOG,"Data Section found: %s Sitting at %08x, size %08x", name, writeAddr, s->sh_size);
}
else
{
LOG(MASTER_LOG,"NonData Section found: %s Ignoring (size=%08x) (flags=%08x)", name, s->sh_size, s->sh_flags);
}
}
*/
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;
}
/* TODO(bunnei): The following is verbatim from Dolphin - needs to be updated for this project:
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 = Common::swap32(symtab[sym].st_size);
if (size == 0)
continue;
// int bind = symtab[sym].st_info >> 4;
int type = symtab[sym].st_info & 0xF;
int sectionIndex = Common::swap16(symtab[sym].st_shndx);
int value = Common::swap32(symtab[sym].st_value);
const char *name = stringBase + Common::swap32(symtab[sym].st_name);
if (bRelocate)
value += sectionAddrs[sectionIndex];
int symtype = Symbol::SYMBOL_DATA;
switch (type)
{
case STT_OBJECT:
symtype = Symbol::SYMBOL_DATA; break;
case STT_FUNC:
symtype = Symbol::SYMBOL_FUNCTION; break;
default:
continue;
}
g_symbolDB.AddKnownSymbol(value, size, name, symtype);
hasSymbols = true;
}
}
g_symbolDB.Index();
return hasSymbols;
}
*/
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