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using Ryujinx.HLE.Exceptions;
using Ryujinx.HLE.HOS.Tamper.Operations;
using System;
using System.Collections.Generic;
namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
{
/// <summary>
/// Code type 9 allows performing arithmetic on registers.
/// </summary>
class Arithmetic
{
private const int OperationWidthIndex = 1;
private const int OperationTypeIndex = 2;
private const int DestinationRegisterIndex = 3;
private const int LeftHandSideRegisterIndex = 4;
private const int UseImmediateAsRhsIndex = 5;
private const int RightHandSideRegisterIndex = 6;
private const int RightHandSideImmediateIndex = 8;
private const int RightHandSideImmediate8 = 8;
private const int RightHandSideImmediate16 = 16;
private const byte Add = 0; // lhs + rhs
private const byte Sub = 1; // lhs - rhs
private const byte Mul = 2; // lhs * rhs
private const byte Lsh = 3; // lhs << rhs
private const byte Rsh = 4; // lhs >> rhs
private const byte And = 5; // lhs & rhs
private const byte Or = 6; // lhs | rhs
private const byte Not = 7; // ~lhs (discards right-hand operand)
private const byte Xor = 8; // lhs ^ rhs
private const byte Mov = 9; // lhs (discards right-hand operand)
public static void Emit(byte[] instruction, CompilationContext context)
{
// 9TCRS0s0
// T: Width of arithmetic operation(1, 2, 4, or 8 bytes).
// C: Arithmetic operation to apply, see below.
// R: Register to store result in.
// S: Register to use as left - hand operand.
// s: Register to use as right - hand operand.
// 9TCRS100 VVVVVVVV (VVVVVVVV)
// T: Width of arithmetic operation(1, 2, 4, or 8 bytes).
// C: Arithmetic operation to apply, see below.
// R: Register to store result in.
// S: Register to use as left - hand operand.
// V: Value to use as right - hand operand.
byte operationWidth = instruction[OperationWidthIndex];
byte operation = instruction[OperationTypeIndex];
Register destinationRegister = context.GetRegister(instruction[DestinationRegisterIndex]);
Register leftHandSideRegister = context.GetRegister(instruction[LeftHandSideRegisterIndex]);
byte rightHandSideIsImmediate = instruction[UseImmediateAsRhsIndex];
IOperand rightHandSideOperand;
switch (rightHandSideIsImmediate)
{
case 0:
// Use a register as right-hand side.
rightHandSideOperand = context.GetRegister(instruction[RightHandSideRegisterIndex]);
break;
case 1:
// Use an immediate as right-hand side.
int immediateSize = operationWidth <= 4 ? RightHandSideImmediate8 : RightHandSideImmediate16;
ulong immediate = InstructionHelper.GetImmediate(instruction, RightHandSideImmediateIndex, immediateSize);
rightHandSideOperand = new Value<ulong>(immediate);
break;
default:
throw new TamperCompilationException($"Invalid right-hand side switch {rightHandSideIsImmediate} in Atmosphere cheat");
}
void Emit(Type operationType, IOperand rhs = null)
{
List<IOperand> operandList = new()
{
destinationRegister,
leftHandSideRegister,
};
if (rhs != null)
{
operandList.Add(rhs);
}
InstructionHelper.Emit(operationType, operationWidth, context, operandList.ToArray());
}
switch (operation)
{
case Add:
Emit(typeof(OpAdd<>), rightHandSideOperand);
break;
case Sub:
Emit(typeof(OpSub<>), rightHandSideOperand);
break;
case Mul:
Emit(typeof(OpMul<>), rightHandSideOperand);
break;
case Lsh:
Emit(typeof(OpLsh<>), rightHandSideOperand);
break;
case Rsh:
Emit(typeof(OpRsh<>), rightHandSideOperand);
break;
case And:
Emit(typeof(OpAnd<>), rightHandSideOperand);
break;
case Or:
Emit(typeof(OpOr<>), rightHandSideOperand);
break;
case Not:
Emit(typeof(OpNot<>));
break;
case Xor:
Emit(typeof(OpXor<>), rightHandSideOperand);
break;
case Mov:
Emit(typeof(OpMov<>));
break;
default:
throw new TamperCompilationException($"Invalid arithmetic operation {operation} in Atmosphere cheat");
}
}
}
}
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