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using Ryujinx.HLE.Exceptions;
using Ryujinx.HLE.HOS.Tamper.Conditions;
using Ryujinx.HLE.HOS.Tamper.Operations;
using System;
using System.Globalization;
namespace Ryujinx.HLE.HOS.Tamper
{
class InstructionHelper
{
private const int CodeTypeIndex = 0;
public static void Emit(IOperation operation, CompilationContext context)
{
context.CurrentOperations.Add(operation);
}
public static void Emit(Type instruction, byte width, CompilationContext context, params Object[] operands)
{
Emit((IOperation)Create(instruction, width, operands), context);
}
public static void EmitMov(byte width, CompilationContext context, IOperand destination, IOperand source)
{
Emit(typeof(OpMov<>), width, context, destination, source);
}
public static ICondition CreateCondition(Comparison comparison, byte width, IOperand lhs, IOperand rhs)
{
ICondition Create(Type conditionType)
{
return (ICondition)InstructionHelper.Create(conditionType, width, lhs, rhs);
}
return comparison switch
{
Comparison.Greater => Create(typeof(CondGT<>)),
Comparison.GreaterOrEqual => Create(typeof(CondGE<>)),
Comparison.Less => Create(typeof(CondLT<>)),
Comparison.LessOrEqual => Create(typeof(CondLE<>)),
Comparison.Equal => Create(typeof(CondEQ<>)),
Comparison.NotEqual => Create(typeof(CondNE<>)),
_ => throw new TamperCompilationException($"Invalid comparison {comparison} in Atmosphere cheat"),
};
}
public static Object Create(Type instruction, byte width, params Object[] operands)
{
Type realType = width switch
{
1 => instruction.MakeGenericType(typeof(byte)),
2 => instruction.MakeGenericType(typeof(ushort)),
4 => instruction.MakeGenericType(typeof(uint)),
8 => instruction.MakeGenericType(typeof(ulong)),
_ => throw new TamperCompilationException($"Invalid instruction width {width} in Atmosphere cheat"),
};
return Activator.CreateInstance(realType, operands);
}
public static ulong GetImmediate(byte[] instruction, int index, int nybbleCount)
{
ulong value = 0;
for (int i = 0; i < nybbleCount; i++)
{
value <<= 4;
value |= instruction[index + i];
}
return value;
}
public static CodeType GetCodeType(byte[] instruction)
{
int codeType = instruction[CodeTypeIndex];
if (codeType >= 0xC)
{
byte extension = instruction[CodeTypeIndex + 1];
codeType = (codeType << 4) | extension;
if (extension == 0xF)
{
extension = instruction[CodeTypeIndex + 2];
codeType = (codeType << 4) | extension;
}
}
return (CodeType)codeType;
}
public static byte[] ParseRawInstruction(string rawInstruction)
{
const int WordSize = 2 * sizeof(uint);
// Instructions are multi-word, with 32bit words. Split the raw instruction
// and parse each word into individual nybbles of bits.
var words = rawInstruction.Split((char[])null, StringSplitOptions.RemoveEmptyEntries);
byte[] instruction = new byte[WordSize * words.Length];
if (words.Length == 0)
{
throw new TamperCompilationException("Empty instruction in Atmosphere cheat");
}
for (int wordIndex = 0; wordIndex < words.Length; wordIndex++)
{
string word = words[wordIndex];
if (word.Length != WordSize)
{
throw new TamperCompilationException($"Invalid word length for {word} in Atmosphere cheat");
}
for (int nybbleIndex = 0; nybbleIndex < WordSize; nybbleIndex++)
{
int index = wordIndex * WordSize + nybbleIndex;
instruction[index] = byte.Parse(word.AsSpan(nybbleIndex, 1), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
}
}
return instruction;
}
}
}
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