public unsafe (string, byte[]) Disassemble(byte[] instr)
{
sbyte[] buf = new sbyte[80];
uint instrSize;
string? disassembled;
using (DisposableGCHandle hBytes = DisposableGCHandle.Pin(instr))
using (DisposableGCHandle hBuf = DisposableGCHandle.Pin(buf)) {
instrSize = LLVM.DisasmInstruction(
hDasm.Handle.ToPointer(),
(byte *)hBytes.AddrOfPinnedObject(),
(ulong)instr.Length,
0,
(sbyte *)hBuf.AddrOfPinnedObject(),
new UIntPtr((uint)buf.Length)
).ToUInt32();
disassembled = Marshal.PtrToStringAnsi(hBuf.AddrOfPinnedObject());
}
byte[] ibytes = new byte[instrSize];
Array.Copy(instr, 0, ibytes, 0, instrSize);
disassembled = (disassembled ?? "").TrimStart(new[] { ' ', '\t' });
return(disassembled, ibytes);
}
public unsafe (string, byte[]?) Disassemble(byte[] bytes)
{
buf.Clear();
ulong pc = 0;
byte[]? ibytes = null;
using (DisposableGCHandle hBytes = DisposableGCHandle.Pin(bytes))
{
dasmInfo.Buffer = (byte *)hBytes.AddrOfPinnedObject();
dasmInfo.BufferLength = (ulong)bytes.Length;
while (pc < (ulong)bytes.Length)
{
int insn_size = dasm(pc, dasmInfo.__Instance);
ibytes = new byte[insn_size];
Array.Copy(bytes, (long)pc, ibytes, 0, insn_size);
pc += (ulong)insn_size;
break; //only first instruction
}
}
string sInstr = SanitizeObjdumpOutput();
return(sInstr, ibytes);
}
private int fprintf(IntPtr h, string fmt, IntPtr args)
{
StringBuilder sb;
using (DisposableGCHandle argsH = DisposableGCHandle.Pin(args)) {
IntPtr pArgs = argsH.AddrOfPinnedObject();
sb = new StringBuilder(_vscprintf(fmt, pArgs) + 1);
vsprintf(sb, fmt, pArgs);
}
var formattedMessage = sb.ToString().Replace("(null)", "\t");
buf.Append(formattedMessage);
return(0);
}
private static unsafe LLVMDisasmContextRef Initialize(string triple)
{
NativeLibrary.Load(@"C:\msys64\mingw64\bin\libLLVM");
LLVM.InitializeAllTargetMCs();
LLVM.InitializeAllTargets();
LLVM.InitializeAllTargetInfos();
LLVM.InitializeAllAsmParsers();
LLVM.InitializeAllAsmPrinters();
LLVM.InitializeAllDisassemblers();
byte[] tripleBytes = Encoding.ASCII.GetBytes(triple);
LLVMDisasmContextRef hDasm;
using (DisposableGCHandle hTriple = DisposableGCHandle.Pin(tripleBytes)) {
hDasm = new LLVMDisasmContextRef(
new IntPtr(LLVM.CreateDisasm(
(sbyte *)hTriple.AddrOfPinnedObject(),
null, 0, IntPtr.Zero, IntPtr.Zero
))
);
}
if (hDasm == null)
{
throw new Exception("CreateDisasm failed");
}
LLVM.SetDisasmOptions(
hDasm.Handle.ToPointer(),
// use alternate variant (Intel) with hex immediates
(ulong)(LLVMDisassemblerOption.PrintImmHex | LLVMDisassemblerOption.AsmPrinterVariant)
);
return(hDasm);
}
