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using Ryujinx.HLE.Exceptions;
using Ryujinx.HLE.HOS.Tamper.Operations;
using System;
namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
{
/// <summary>
/// Code type 7 allows performing arithmetic on registers. However, it has been deprecated by Code
/// type 9, and is only kept for backwards compatibility.
/// </summary>
class LegacyArithmetic
{
const int OperationWidthIndex = 1;
const int DestinationRegisterIndex = 3;
const int OperationTypeIndex = 4;
const int ValueImmediateIndex = 8;
const int ValueImmediateSize = 8;
private const byte Add = 0; // reg += rhs
private const byte Sub = 1; // reg -= rhs
private const byte Mul = 2; // reg *= rhs
private const byte Lsh = 3; // reg <<= rhs
private const byte Rsh = 4; // reg >>= rhs
public static void Emit(byte[] instruction, CompilationContext context)
{
// 7T0RC000 VVVVVVVV
// T: Width of arithmetic operation(1, 2, 4, or 8 bytes).
// R: Register to apply arithmetic to.
// C: Arithmetic operation to apply, see below.
// V: Value to use for arithmetic operation.
byte operationWidth = instruction[OperationWidthIndex];
Register register = context.GetRegister(instruction[DestinationRegisterIndex]);
byte operation = instruction[OperationTypeIndex];
ulong immediate = InstructionHelper.GetImmediate(instruction, ValueImmediateIndex, ValueImmediateSize);
Value<ulong> rightHandSideValue = new Value<ulong>(immediate);
void Emit(Type operationType)
{
InstructionHelper.Emit(operationType, operationWidth, context, register, register, rightHandSideValue);
}
switch (operation)
{
case Add: Emit(typeof(OpAdd<>)); break;
case Sub: Emit(typeof(OpSub<>)); break;
case Mul: Emit(typeof(OpMul<>)); break;
case Lsh: Emit(typeof(OpLsh<>)); break;
case Rsh: Emit(typeof(OpRsh<>)); break;
default:
throw new TamperCompilationException($"Invalid arithmetic operation {operation} in Atmosphere cheat");
}
}
}
}
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