BALocalization/Il2CppInspectorRedux
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map NSOs at the same base addresses as the IDA loader

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LukeFZ
2026-03-19 14:57:32 +01:00
parent f672ac42fe
commit 35cf3829e5
1 changed files with 40 additions and 17 deletions
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57
Il2CppInspector.Common/FileFormatStreams/NsoReader.cs
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@@ -1,5 +1,6 @@
#nullable enable
using Il2CppInspector.Next;
using K4os.Compression.LZ4;
using System.Buffers;
using System.Buffers.Binary;
@@ -7,7 +8,6 @@ using System.Collections.Frozen;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using Il2CppInspector.Next;
using VersionedSerialization;
namespace Il2CppInspector;
@@ -35,6 +35,12 @@ internal class ByteArrayBackingBuffer : IDisposable
Initialized = true;
}
public void SetBaseAddress(ulong baseAddress)
{
Debug.Assert(BaseAddress == 0);
BaseAddress = baseAddress;
}
protected int TranslateVaToRva(ulong address)
{
Debug.Assert(address >= BaseAddress);
@@ -120,9 +126,6 @@ public class NsoReader : FileFormatStream<NsoReader>
public override string Arch => "ARM64";
public override string Format => "NSO";
// NOTE: This does not work for some reason?
// public override ulong ImageBase => 0x7100000000;
protected override void Dispose(bool disposing)
{
if (disposing)
@@ -181,13 +184,18 @@ public class NsoReader : FileFormatStream<NsoReader>
var thirdEntry = _mappedExecutable.ReadPrimitive<ulong>(modInfoHeader.ModOffset + modHeader.DynamicOffset + (2 * 0x8));
_is32Bit = firstEntry > uint.MaxValue || thirdEntry > uint.MaxValue;
// These were pulled from nxo64.py, the IDA loader for switch objects
var baseAddress = Is32Bit ? 0x60000000u : 0x7100000000u;
GlobalOffset = baseAddress;
_mappedExecutable.SetBaseAddress(baseAddress);
var currentDynamicOffset = modInfoHeader.ModOffset + modHeader.DynamicOffset;
var dynamicEntries = new Dictionary<DynamicTag, ulong>();
var dynamicEntrySize = (uint)DynamicEntry.StructSize(config: new ReaderConfig(Is32Bit));
while (true)
{
var entry = _mappedExecutable.ReadObject<DynamicEntry>(currentDynamicOffset, default);
var entry = _mappedExecutable.ReadObject<DynamicEntry>(ImageBase + currentDynamicOffset, default);
if (entry.Tag == DynamicTag.DT_NULL)
break;
@@ -266,7 +274,7 @@ public class NsoReader : FileFormatStream<NsoReader>
// Clear out relocation sections in memory so searching is faster
foreach (var (start, end) in _relocationEntryRegions)
{
_mappedExecutable.Clear(start, checked((long)(end - start)));
_mappedExecutable.Clear(ImageBase + start, checked((long)(end - start)));
}
return;
@@ -283,12 +291,12 @@ public class NsoReader : FileFormatStream<NsoReader>
var offset = relocation.Offset;
var type = (RelocationType)(Is32Bit ? relocation.Info & byte.MaxValue : relocation.Info & uint.MaxValue);
var symbolIndex = (uint)(relocation.Info >> (Is32Bit ? 8 : 32));
var addend = checked((ulong)(relocation.Addend ?? _mappedExecutable.ReadPrimitive<long>(offset)));
var addend = checked((ulong)(relocation.Addend ?? _mappedExecutable.ReadPrimitive<long>(ImageBase + offset)));
if (!symbolCache.TryGetValue(symbolIndex, out var symbolEntry))
{
var symtabEntryAddress = symtabAddress + symbolIndex * symtabEntrySize;
symbolEntry = _mappedExecutable.ReadObject<SymbolEntry>(symtabEntryAddress, default);
symbolEntry = _mappedExecutable.ReadObject<SymbolEntry>(ImageBase + symtabEntryAddress, default);
symbolCache[symbolIndex] = symbolEntry;
}
@@ -305,7 +313,7 @@ public class NsoReader : FileFormatStream<NsoReader>
if (handled)
{
_mappedExecutable.WriteNUInt(offset, value);
_mappedExecutable.WriteNUInt(ImageBase + offset, ImageBase + value);
}
else
{
@@ -314,24 +322,39 @@ public class NsoReader : FileFormatStream<NsoReader>
}
}
List<(ulong, ulong, long?)> ParseRelSection(ulong address, ulong size)
List<(ulong, ulong, long?)> ParseRelSection(ulong rva, ulong size)
{
var entrySize = _dynamicEntries[DynamicTag.DT_RELENT];
var entryCount = size / entrySize;
return _mappedExecutable.ReadObjectArray<RelEntry>(address, checked((int)entryCount), default)
.Select<RelEntry, (ulong, ulong, long?)>(x => (x.Offset, x.Info, null))
.ToList();
return [.. _mappedExecutable.ReadObjectArray<RelEntry>(ImageBase + rva, checked((int)entryCount), default)
.Select<RelEntry, (ulong, ulong, long?)>(x => (x.Offset, x.Info, null))];
}
List<(ulong, ulong, long?)> ParseRelaSection(ulong address, ulong size)
List<(ulong, ulong, long?)> ParseRelaSection(ulong rva, ulong size)
{
var entrySize = _dynamicEntries[DynamicTag.DT_RELAENT];
var entryCount = size / entrySize;
return _mappedExecutable.ReadObjectArray<RelaEntry>(address, checked((int)entryCount), default)
.Select<RelaEntry, (ulong, ulong, long?)>(x => (x.Offset, x.Info, x.Addend))
.ToList();
return [.. _mappedExecutable.ReadObjectArray<RelaEntry>(ImageBase + rva, checked((int)entryCount), default)
.Select<RelaEntry, (ulong, ulong, long?)>(x => (x.Offset, x.Info, x.Addend))];
}
}
public override uint[] GetFunctionTable() => [];
public override bool TryMapVATR(ulong uiAddr, out uint fileOffset)
{
if (uiAddr < ImageBase)
{
fileOffset = 0;
return false;
}
fileOffset = checked((uint)(uiAddr - ImageBase));
return true;
}
public override ulong MapFileOffsetToVA(uint offset)
=> ImageBase + offset;
}