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x86 code/metadata pointers can use MOV indirection

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This commit is contained in:
Katy Coe
2017-10-19 03:51:52 +02:00
parent 9542d0abc3
commit 083d1328d6
1 changed files with 22 additions and 2 deletions
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24
Il2CppInspector/Il2CppReaderX86.cs
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@@ -14,6 +14,7 @@ namespace Il2CppInspector
public Il2CppReaderX86(IFileFormatReader stream, uint codeRegistration, uint metadataRegistration) : base(stream, codeRegistration, metadataRegistration) { } public Il2CppReaderX86(IFileFormatReader stream, uint codeRegistration, uint metadataRegistration) : base(stream, codeRegistration, metadataRegistration) { }
protected override (uint, uint) Search(uint loc, uint globalOffset) { protected override (uint, uint) Search(uint loc, uint globalOffset) {
uint funcPtr, metadata, code; uint funcPtr, metadata, code;
ushort opcode;
// Variant 1 // Variant 1
@@ -48,10 +49,29 @@ namespace Il2CppInspector
funcPtr = Image.MapVATR(Image.ReadUInt32() + globalOffset); funcPtr = Image.MapVATR(Image.ReadUInt32() + globalOffset);
if (funcPtr > Image.Stream.BaseStream.Length) if (funcPtr > Image.Stream.BaseStream.Length)
return (0, 0); return (0, 0);
Image.Position = funcPtr + 0x22;
// Extract Metadata pointer
// An 0x838D opcode indicates LEA (no indirection)
Image.Position = funcPtr + 0x20;
opcode = Image.ReadUInt16();
metadata = Image.ReadUInt32() + globalOffset; metadata = Image.ReadUInt32() + globalOffset;
Image.Position = funcPtr + 0x2C;
// An 8x838B opcode indicates MOV (pointer indirection)
if (opcode == 0x838B) {
Image.Position = Image.MapVATR(metadata);
metadata = Image.ReadUInt32();
}
// Repeat the same logic for extracting the Code pointer
Image.Position = funcPtr + 0x2A;
opcode = Image.ReadUInt16();
code = Image.ReadUInt32() + globalOffset; code = Image.ReadUInt32() + globalOffset;
if (opcode == 0x838B) {
Image.Position = Image.MapVATR(code);
code = Image.ReadUInt32();
}
return (code, metadata); return (code, metadata);
} }
} }