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using Ryujinx.HLE.Exceptions;
using Ryujinx.HLE.HOS.Tamper.Operations;
namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
{
/// <summary>
/// Code type 0xC1 performs saving or restoring of registers.
/// NOTE: Registers are saved and restored to a different set of registers than the ones used
/// for the other opcodes (Save Registers).
/// </summary>
class SaveOrRestoreRegister
{
private const int DestinationRegisterIndex = 3;
private const int SourceRegisterIndex = 5;
private const int OperationTypeIndex = 6;
private const int RestoreRegister = 0;
private const int SaveRegister = 1;
private const int ClearSavedValue = 2;
private const int ClearRegister = 3;
public static void Emit(byte[] instruction, CompilationContext context)
{
// C10D0Sx0
// D: Destination index.
// S: Source index.
// x: Operand Type, see below.
byte destinationRegIndex = instruction[DestinationRegisterIndex];
byte sourceRegIndex = instruction[SourceRegisterIndex];
byte operationType = instruction[OperationTypeIndex];
Impl(operationType, destinationRegIndex, sourceRegIndex, context);
}
public static void Impl(byte operationType, byte destinationRegIndex, byte sourceRegIndex, CompilationContext context)
{
IOperand destinationOperand;
IOperand sourceOperand;
switch (operationType)
{
case RestoreRegister:
destinationOperand = context.GetRegister(destinationRegIndex);
sourceOperand = context.GetSavedRegister(sourceRegIndex);
break;
case SaveRegister:
destinationOperand = context.GetSavedRegister(destinationRegIndex);
sourceOperand = context.GetRegister(sourceRegIndex);
break;
case ClearSavedValue:
destinationOperand = new Value<ulong>(0);
sourceOperand = context.GetSavedRegister(sourceRegIndex);
break;
case ClearRegister:
destinationOperand = new Value<ulong>(0);
sourceOperand = context.GetRegister(sourceRegIndex);
break;
default:
throw new TamperCompilationException($"Invalid register operation type {operationType} in Atmosphere cheat");
}
context.CurrentOperations.Add(new OpMov<ulong>(destinationOperand, sourceOperand));
}
}
}
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