private void LoadImportReferencesFromRelaPlt()
{
var rela_plt = loader.GetSectionInfoByName(".rela.plt");
var plt = loader.GetSectionInfoByName(".plt");
if (rela_plt == null || plt == null)
{
return;
}
var relaRdr = loader.CreateReader(rela_plt.FileOffset);
for (ulong i = 0; i < rela_plt.EntryCount(); ++i)
{
// Read the .rela.plt entry
var rela = Elf64_Rela.Read(relaRdr);
ulong sym = rela.r_info >> 32;
var fileOff = rela_plt.LinkedSection !.FileOffset;
if (fileOff == 0)
{
continue;
}
var symStr = loader.Symbols[fileOff][(int)sym];
var addr = plt.Address !+(uint)(i + 1) * plt.EntrySize;
var st = ElfLoader.GetSymbolType(symStr);
if (st.HasValue)
{
importReferences ![addr] = new NamedImportReference(addr, null, symStr.Name, st.Value);
/// <summary>
/// Generate GOT entries for the global (imported) symbols of the MIPS ELF binary
/// </summary>
/// <remarks>
/// The Elf MIPS ABI specifies that the GOT entries for import symbols are located after
/// the GOT entries for the local functions. In addition they are orderd in the same order
/// as the corresponding symbols in the symbol table.
/// </remarks>
private void LocateGlobalGotEntries(Program program, SortedList <Address, ImageSymbol> symbols)
{
var dynamic = loader.DynamicEntries;
var uAddrSymtab = (uint)dynamic[ElfDynamicEntry.DT_SYMTAB].UValue;
var allSymbols = loader.DynamicSymbols;
var cLocalSymbols = (int)dynamic[ElfDynamicEntry.Mips.DT_MIPS_GOTSYM].SValue;
var cTotalSymbols = (int)dynamic[ElfDynamicEntry.Mips.DT_MIPS_SYMTABNO].SValue;
var cGlobalSymbols = cTotalSymbols - cLocalSymbols;
var numberoflocalPointers = (int)dynamic[ElfDynamicEntry.Mips.DT_MIPS_LOCAL_GOTNO].SValue;
var uAddrBeginningOfGot = (uint)dynamic[ElfDynamicEntry.DT_PLTGOT].UValue;
var uAddrBeginningOfGlobalPointers = uAddrBeginningOfGot + (uint)numberoflocalPointers * PointerByteSize;
for (int i = 0; i < cGlobalSymbols; ++i)
{
var addrGot = Address.Ptr32(uAddrBeginningOfGlobalPointers + PointerByteSize * (uint)i);
var iSymbol = cLocalSymbols + i;
if (allSymbols.TryGetValue(iSymbol, out var symbol) &&
symbol.Type == ElfSymbolType.STT_FUNC)
{
// This GOT entry is a known symbol!
ImageSymbol symGotEntry = loader.CreateGotSymbol(addrGot, symbol.Name);
symbols[addrGot] = symGotEntry;
Debug.Print("Found GOT entry at {0}, changing symbol at {1}", symGotEntry, addrGot);
var st = ElfLoader.GetSymbolType(symbol);
if (st.HasValue)
{
program.ImportReferences[addrGot] = new NamedImportReference(addrGot, null, symbol.Name, st.Value);
}
}
}
}
public override ElfSymbol RelocateEntry(Program program, ElfSymbol symbol, ElfSection referringSection, ElfRelocation rela)
{
var rt = (SuperHrt)(byte)rela.Info;
if (rt == SuperHrt.R_SH_GLOB_DAT ||
rt == SuperHrt.R_SH_JMP_SLOT)
{
var addrPfn = Address.Ptr32((uint)rela.Offset);
Debug.Print("Import reference {0} - {1}", addrPfn, symbol.Name);
var st = ElfLoader.GetSymbolType(symbol);
if (st.HasValue)
{
program.ImportReferences[addrPfn] = new NamedImportReference(addrPfn, null, symbol.Name, st.Value);
}
return(symbol);
}
return(symbol);
}
public override ElfSymbol RelocateEntry(Program program, ElfSymbol sym, ElfSection referringSection, ElfRelocation rela)
{
if (loader.Sections.Count <= sym.SectionIndex)
{
return(sym);
}
var rt = (SparcRt)(rela.Info & 0xFF);
if (sym.SectionIndex == 0)
{
if (rt == SparcRt.R_SPARC_GLOB_DAT ||
rt == SparcRt.R_SPARC_JMP_SLOT)
{
var addrPfn = Address.Ptr32((uint)rela.Offset);
Debug.Print("Import reference {0} - {1}", addrPfn, sym.Name);
var st = ElfLoader.GetSymbolType(sym);
if (st.HasValue)
{
importReferences[addrPfn] = new NamedImportReference(addrPfn, null, sym.Name, st.Value);
}
return(sym);
}
}
var symSection = loader.Sections[(int)sym.SectionIndex];
uint S = (uint)sym.Value + symSection.Address.ToUInt32();
int A = 0;
int sh = 0;
uint mask = ~0u;
Address addr;
if (referringSection != null)
{
addr = referringSection.Address + rela.Offset;
}
else
{
addr = Address.Ptr32((uint)rela.Offset);
}
uint P = (uint)addr.ToLinear();
uint PP = P;
uint B = 0;
Debug.Print(" off:{0:X8} type:{1,-16} add:{3,-20} {4,3} {2} {5}",
rela.Offset,
(SparcRt)(rela.Info & 0xFF),
sym.Name,
rela.Addend,
(int)(rela.Info >> 8),
"section?");
switch (rt)
{
case 0:
return(sym);
case SparcRt.R_SPARC_HI22:
A = (int)rela.Addend;
sh = 10;
P = 0;
break;
case SparcRt.R_SPARC_LO10:
A = (int)rela.Addend;
mask = 0x3FF;
P = 0;
break;
case SparcRt.R_SPARC_32:
A = (int)rela.Addend;
mask = 0xFFFFFFFF;
P = 0;
break;
case SparcRt.R_SPARC_WDISP30:
A = (int)rela.Addend;
P = ~P + 1;
sh = 2;
break;
case SparcRt.R_SPARC_RELATIVE:
A = (int)rela.Addend;
B = program.SegmentMap.BaseAddress.ToUInt32();
break;
case SparcRt.R_SPARC_COPY:
Debug.Print("Relocation type {0} not handled yet.", rt);
return(sym);
default:
throw new NotImplementedException(string.Format(
"SPARC ELF relocation type {0} not implemented yet.",
rt));
}
var arch = program.Architecture;
var relR = program.CreateImageReader(arch, addr);
var relW = program.CreateImageWriter(arch, addr);
var w = relR.ReadBeUInt32();
w += ((uint)(B + S + A + P) >> sh) & mask;
relW.WriteBeUInt32(w);
return(sym);
}
public override ElfSymbol RelocateEntry(Program program, ElfSymbol sym, ElfSection referringSection, ElfRelocation rela)
{
var rt = (x86_64Rt)(rela.Info & 0xFF);
if (loader.Sections.Count <= sym.SectionIndex)
{
return(sym);
}
if (rt == x86_64Rt.R_X86_64_GLOB_DAT ||
rt == x86_64Rt.R_X86_64_JUMP_SLOT)
{
var addrPfn = Address.Ptr64(rela.Offset);
var st = ElfLoader.GetSymbolType(sym);
if (!st.HasValue)
{
return(sym);
}
importReferences.Add(addrPfn, new NamedImportReference(addrPfn, null, sym.Name, st.Value));
var gotSym = loader.CreateGotSymbol(addrPfn, sym.Name);
imageSymbols.Add(addrPfn, gotSym);
return(sym);
}
if (sym.SectionIndex == 0)
{
return(sym);
}
var symSection = loader.Sections[(int)sym.SectionIndex];
ulong S = (ulong)sym.Value + symSection.Address.ToLinear();
long A = 0;
int sh = 0;
uint mask = ~0u;
Address addr;
ulong P;
if (referringSection?.Address != null)
{
addr = referringSection.Address + rela.Offset;
P = addr.ToLinear();
}
else
{
addr = Address.Ptr64(rela.Offset);
P = 0;
}
var arch = program.Architecture;
var relR = program.CreateImageReader(arch, addr);
var relW = program.CreateImageWriter(arch, addr);
ulong PP = P;
switch (rt)
{
case x86_64Rt.R_X86_64_NONE: // just ignore (common)
break;
case x86_64Rt.R_X86_64_COPY:
break;
default:
Debug.Print("x86_64 ELF relocation type {0} not implemented yet.",
rt);
break;
//throw new NotImplementedException(string.Format(
// "x86_64 ELF relocation type {0} not implemented yet.",
// rt));
}
if (relR != null)
{
var w = relR.ReadUInt64();
w += ((ulong)(S + (ulong)A + P) >> sh) & mask;
relW.WriteUInt64(w);
}
return(sym);
}
public override (Address?, ElfSymbol?) RelocateEntry(Program program, ElfSymbol sym, ElfSection?referringSection, ElfRelocation rela)
{
if (loader.Sections.Count <= sym.SectionIndex)
{
return(null, null);
}
var rt = (SparcRt)(rela.Info & 0xFF);
var addr = referringSection != null
? referringSection.Address !+rela.Offset
: loader.CreateAddress(rela.Offset);
if (sym.SectionIndex == 0)
{
if (rt == SparcRt.R_SPARC_GLOB_DAT ||
rt == SparcRt.R_SPARC_JMP_SLOT)
{
var addrPfn = Address.Ptr32((uint)rela.Offset);
ElfImageLoader.trace.Verbose("Import reference {0} - {1}", addrPfn, sym.Name);
var st = ElfLoader.GetSymbolType(sym);
if (st.HasValue)
{
importReferences[addrPfn] = new NamedImportReference(addrPfn, null, sym.Name, st.Value);
}
return(addrPfn, null);
}
}
var symSection = loader.Sections[(int)sym.SectionIndex];
ulong S = 0;
int A = 0;
int sh = 0;
uint mask = ~0u;
if (referringSection != null)
{
addr = referringSection.Address !+rela.Offset;
}
else
{
addr = Address.Ptr64(rela.Offset);
}
ulong P = addr.ToLinear();
ulong PP = P;
ulong B = 0;
ElfImageLoader.trace.Verbose(" off:{0:X8} type:{1,-16} add:{3,-20} {4,3} {2} {5}",
rela.Offset,
(SparcRt)(rela.Info & 0xFF),
sym.Name,
rela.Addend.HasValue ? rela.Addend.Value : 0,
(int)(rela.Info >> 8),
"section?");
switch (rt)
{
case 0:
return(null, null);
case SparcRt.R_SPARC_HI22:
A = (int)rela.Addend !.Value;
sh = 10;
P = 0;
mask = 0x3FFFFF;
return(Relocate32(program, sym, addr, S, A, sh, mask, P, B));
case SparcRt.R_SPARC_LM22:
A = (int)rela.Addend !.Value;
S = sym.Value;
sh = 10;
P = 0;
mask = 0x3FFFFF;
return(Relocate32(program, sym, addr, S, A, sh, mask, P, B));
case SparcRt.R_SPARC_LO10:
A = (int)rela.Addend !.Value;
S = sym.Value;
mask = 0x3FF;
P = 0;
return(Relocate32(program, sym, addr, S, A, sh, mask, P, B));
case SparcRt.R_SPARC_32:
A = (int)rela.Addend !.Value;
S = sym.Value;
mask = 0xFFFFFFFF;
P = 0;
return(Relocate32(program, sym, addr, S, A, sh, mask, P, B));
case SparcRt.R_SPARC_WDISP30:
A = (int)rela.Addend !.Value;
P = ~P + 1;
sh = 2;
return(Relocate32(program, sym, addr, S, A, sh, mask, P, B));
case SparcRt.R_SPARC_RELATIVE:
A = (int)rela.Addend !.Value;
B = program.SegmentMap.BaseAddress.ToLinear();
P = 0;
return(Relocate64(program, sym, addr, S, A, sh, mask, P, B));
case SparcRt.R_SPARC_COPY:
ElfImageLoader.trace.Warn("Relocation type {0} not handled yet.", rt);
return(addr, null);
default:
ElfImageLoader.trace.Error(
"SPARC ELF relocation type {0} not implemented yet.",
rt);
return(addr, null);
}
}
public override (Address?, ElfSymbol?) RelocateEntry(Program program, ElfSymbol sym, ElfSection?referringSection, ElfRelocation rela)
{
if (loader.Sections.Count <= sym.SectionIndex)
{
return(null, null);
}
var rt = (SparcRt)(rela.Info & 0xFF);
if (sym.SectionIndex == 0)
{
if (rt == SparcRt.R_SPARC_GLOB_DAT ||
rt == SparcRt.R_SPARC_JMP_SLOT)
{
var addrPfn = Address.Ptr32((uint)rela.Offset);
Debug.Print("Import reference {0} - {1}", addrPfn, sym.Name);
var st = ElfLoader.GetSymbolType(sym);
if (st.HasValue)
{
importReferences[addrPfn] = new NamedImportReference(addrPfn, null, sym.Name, st.Value);
}
return(addrPfn, null);
}
}
var symSection = loader.Sections[(int)sym.SectionIndex];
uint S = (uint)sym.Value + symSection.Address !.ToUInt32();
int A = 0;
int sh = 0;
uint mask = ~0u;
Address addr;
if (referringSection != null)
{
addr = referringSection.Address !+rela.Offset;
}
else
{
addr = Address.Ptr32((uint)rela.Offset);
}
uint P = (uint)addr.ToLinear();
uint PP = P;
uint B = 0;
Debug.Print(" off:{0:X8} type:{1,-16} add:{3,-20} {4,3} {2} {5}",
rela.Offset,
(SparcRt)(rela.Info & 0xFF),
sym.Name,
rela.Addend,
(int)(rela.Info >> 8),
"section?");
switch (rt)
{
case 0:
return(addr, null);
case SparcRt.R_SPARC_HI22:
A = (int)rela.Addend;
sh = 10;
P = 0;
break;
case SparcRt.R_SPARC_LO10:
A = (int)rela.Addend;
mask = 0x3FF;
P = 0;
break;
case SparcRt.R_SPARC_32:
A = (int)rela.Addend;
mask = 0xFFFFFFFF;
P = 0;
break;
case SparcRt.R_SPARC_WDISP30:
A = (int)re