Ryujinx/Ryujinx.HLE/HOS/Tamper/InstructionHelper.cs
Caian Benedicto 0c1ea1212a
Add the TamperMachine module for runtime mods and cheats (#1928)
* Add initial implementation of the Tamper Machine

* Implement Atmosphere opcodes 0, 4 and 9

* Add missing TamperCompilationException class

* Implement Atmosphere conditional and loop opcodes 1, 2 and 3

* Inplement input conditional opcode 8

* Add register store opcode A

* Implement extended pause/resume opcodes FF0 and FF1

* Implement extended log opcode FFF

* Implement extended register conditional opcode C0

* Refactor TamperProgram to an interface

* Moved Atmosphere classes to a separate subdirectory

* Fix OpProcCtrl class not setting process

* Implement extended register save/restore opcodes C1, C2 and C3

* Refactor code emitters to separate classes

* Supress memory access errors from the Tamper Machine

* Add debug information to tamper register and memory writes

* Add block stack check to Atmosphere Cheat compiler

* Add handheld input support to Tamper Machine

* Fix code styling

* Fix build id and cheat case mismatch

* Fix invalid immediate size selection

* Print build ids of the title

* Prevent Tamper Machine from change code regions

* Remove Atmosphere namespace

* Remove empty cheats from the list

* Prevent code modification without disabling the tampering

* Fix missing addressing mode in LoadRegisterWithMemory

* Fix wrong addressing in RegisterConditional

* Add name to the tamper machine thread

* Fix code styling
2021-03-27 15:12:05 +01:00

134 lines
4.7 KiB
C#

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);
}
switch (comparison)
{
case Comparison.Greater : return Create(typeof(CondGT<>));
case Comparison.GreaterOrEqual: return Create(typeof(CondGE<>));
case Comparison.Less : return Create(typeof(CondLT<>));
case Comparison.LessOrEqual : return Create(typeof(CondLE<>));
case Comparison.Equal : return Create(typeof(CondEQ<>));
case Comparison.NotEqual : return Create(typeof(CondNE<>));
default:
throw new TamperCompilationException($"Invalid comparison {comparison} in Atmosphere cheat");
}
}
public static Object Create(Type instruction, byte width, params Object[] operands)
{
Type realType;
switch (width)
{
case 1: realType = instruction.MakeGenericType(typeof(byte)); break;
case 2: realType = instruction.MakeGenericType(typeof(ushort)); break;
case 4: realType = instruction.MakeGenericType(typeof(uint)); break;
case 8: realType = instruction.MakeGenericType(typeof(ulong)); break;
default:
throw new TamperCompilationException($"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;
string byteData = word.Substring(nybbleIndex, 1);
instruction[index] = byte.Parse(byteData, NumberStyles.HexNumber, CultureInfo.InvariantCulture);
}
}
return instruction;
}
}
}