1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
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(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");
}
}
}
}
|
