79 lines
2.8 KiB
C#
79 lines
2.8 KiB
C#
/*
|
|
Copyright 2017 Katy Coe - http://www.hearthcode.org - http://www.djkaty.com
|
|
|
|
All rights reserved.
|
|
*/
|
|
|
|
using System.Linq;
|
|
|
|
namespace Il2CppInspector
|
|
{
|
|
internal class Il2CppReaderX86 : Il2CppReader
|
|
{
|
|
public Il2CppReaderX86(IFileFormatReader stream) : base(stream) { }
|
|
public Il2CppReaderX86(IFileFormatReader stream, uint codeRegistration, uint metadataRegistration) : base(stream, codeRegistration, metadataRegistration) { }
|
|
protected override (uint, uint) Search(uint loc, uint globalOffset) {
|
|
uint funcPtr, metadata, code;
|
|
ushort opcode;
|
|
|
|
// Variant 1
|
|
|
|
// Assembly bytes to search for at start of each function
|
|
var bytes = new byte[] { 0x6A, 0x00, 0x6A, 0x00, 0x68 };
|
|
Image.Position = loc;
|
|
var buff = Image.ReadBytes(5);
|
|
if (bytes.SequenceEqual(buff)) {
|
|
// Next 4 bytes are the function pointer being pushed onto the stack
|
|
funcPtr = Image.ReadUInt32();
|
|
|
|
// Start of next instruction
|
|
if (Image.ReadByte() != 0xB9)
|
|
return (0, 0);
|
|
|
|
// Jump to Il2CppCodegenRegistration
|
|
Image.Position = Image.MapVATR(funcPtr) + 6;
|
|
metadata = Image.ReadUInt32();
|
|
Image.Position = Image.MapVATR(funcPtr) + 11;
|
|
code = Image.ReadUInt32();
|
|
return (code, metadata);
|
|
}
|
|
|
|
// Variant 2
|
|
bytes = new byte[] { 0x55, 0x89, 0xE5, 0x53, 0x83, 0xE4, 0xF0, 0x83, 0xEC, 0x20, 0xE8, 0x00, 0x00, 0x00, 0x00, 0x5B };
|
|
Image.Position = loc;
|
|
buff = Image.ReadBytes(16);
|
|
if (!bytes.SequenceEqual(buff))
|
|
return (0, 0);
|
|
|
|
Image.Position += 8;
|
|
funcPtr = Image.MapVATR(Image.ReadUInt32() + globalOffset);
|
|
if (funcPtr > Image.Stream.BaseStream.Length)
|
|
return (0, 0);
|
|
|
|
// Extract Metadata pointer
|
|
// An 0x838D opcode indicates LEA (no indirection)
|
|
Image.Position = funcPtr + 0x20;
|
|
opcode = Image.ReadUInt16();
|
|
metadata = Image.ReadUInt32() + globalOffset;
|
|
|
|
// 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;
|
|
|
|
if (opcode == 0x838B) {
|
|
Image.Position = Image.MapVATR(code);
|
|
code = Image.ReadUInt32();
|
|
}
|
|
|
|
return (code, metadata);
|
|
}
|
|
}
|
|
}
|