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using ChocolArm64.Memory;
using Ryujinx.Loaders.Executables;
using Ryujinx.OsHle;
using System.Collections.Generic;
namespace Ryujinx.Loaders
{
class Executable
{
private IElf NsoData;
private AMemory Memory;
private ElfDyn[] Dynamic;
public long ImageBase { get; private set; }
public long ImageEnd { get; private set; }
public Executable(IElf NsoData, AMemory Memory, long ImageBase)
{
this.NsoData = NsoData;
this.Memory = Memory;
this.ImageBase = ImageBase;
this.ImageEnd = ImageBase;
WriteData(ImageBase + NsoData.TextOffset, NsoData.Text, MemoryType.CodeStatic, AMemoryPerm.RX);
WriteData(ImageBase + NsoData.ROOffset, NsoData.RO, MemoryType.Normal, AMemoryPerm.Read);
WriteData(ImageBase + NsoData.DataOffset, NsoData.Data, MemoryType.Normal, AMemoryPerm.RW);
if (NsoData.Text.Count == 0)
{
return;
}
long Mod0Offset = ImageBase + NsoData.Mod0Offset;
int Mod0Magic = Memory.ReadInt32(Mod0Offset + 0x0);
long DynamicOffset = Memory.ReadInt32(Mod0Offset + 0x4) + Mod0Offset;
long BssStartOffset = Memory.ReadInt32(Mod0Offset + 0x8) + Mod0Offset;
long BssEndOffset = Memory.ReadInt32(Mod0Offset + 0xc) + Mod0Offset;
long EhHdrStartOffset = Memory.ReadInt32(Mod0Offset + 0x10) + Mod0Offset;
long EhHdrEndOffset = Memory.ReadInt32(Mod0Offset + 0x14) + Mod0Offset;
long ModObjOffset = Memory.ReadInt32(Mod0Offset + 0x18) + Mod0Offset;
long BssSize = BssEndOffset - BssStartOffset;
Memory.Manager.MapPhys(BssStartOffset, BssSize, (int)MemoryType.Normal, AMemoryPerm.RW);
ImageEnd = BssEndOffset;
List<ElfDyn> Dynamic = new List<ElfDyn>();
while (true)
{
long TagVal = Memory.ReadInt64(DynamicOffset + 0);
long Value = Memory.ReadInt64(DynamicOffset + 8);
DynamicOffset += 0x10;
ElfDynTag Tag = (ElfDynTag)TagVal;
if (Tag == ElfDynTag.DT_NULL)
{
break;
}
Dynamic.Add(new ElfDyn(Tag, Value));
}
this.Dynamic = Dynamic.ToArray();
}
private void WriteData(
long Position,
IList<byte> Data,
MemoryType Type,
AMemoryPerm Perm)
{
Memory.Manager.MapPhys(Position, Data.Count, (int)Type, Perm);
for (int Index = 0; Index < Data.Count; Index++)
{
Memory.WriteByte(Position + Index, Data[Index]);
}
}
private ElfRel GetRelocation(long Position)
{
long Offset = Memory.ReadInt64(Position + 0);
long Info = Memory.ReadInt64(Position + 8);
long Addend = Memory.ReadInt64(Position + 16);
int RelType = (int)(Info >> 0);
int SymIdx = (int)(Info >> 32);
ElfSym Symbol = GetSymbol(SymIdx);
return new ElfRel(Offset, Addend, Symbol, (ElfRelType)RelType);
}
private ElfSym GetSymbol(int Index)
{
long StrTblAddr = ImageBase + GetFirstValue(ElfDynTag.DT_STRTAB);
long SymTblAddr = ImageBase + GetFirstValue(ElfDynTag.DT_SYMTAB);
long SymEntSize = GetFirstValue(ElfDynTag.DT_SYMENT);
long Position = SymTblAddr + Index * SymEntSize;
return GetSymbol(Position, StrTblAddr);
}
private ElfSym GetSymbol(long Position, long StrTblAddr)
{
int NameIndex = Memory.ReadInt32(Position + 0);
int Info = Memory.ReadByte(Position + 4);
int Other = Memory.ReadByte(Position + 5);
int SHIdx = Memory.ReadInt16(Position + 6);
long Value = Memory.ReadInt64(Position + 8);
long Size = Memory.ReadInt64(Position + 16);
string Name = string.Empty;
for (int Chr; (Chr = Memory.ReadByte(StrTblAddr + NameIndex++)) != 0;)
{
Name += (char)Chr;
}
return new ElfSym(Name, Info, Other, SHIdx, ImageBase, Value, Size);
}
private long GetFirstValue(ElfDynTag Tag)
{
foreach (ElfDyn Entry in Dynamic)
{
if (Entry.Tag == Tag)
{
return Entry.Value;
}
}
return 0;
}
}
}
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