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using Ryujinx.HLE.Exceptions;
namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
{
/// <summary>
/// Code type 5 allows loading a value from memory into a register, either using a fixed address or by
/// dereferencing the destination register.
/// </summary>
class LoadRegisterWithMemory
{
private const int OperationWidthIndex = 1;
private const int MemoryRegionIndex = 2;
private const int DestinationRegisterIndex = 3;
private const int UseDestinationAsSourceIndex = 4;
private const int OffsetImmediateIndex = 6;
private const int OffsetImmediateSize = 10;
public static void Emit(byte[] instruction, CompilationContext context)
{
// 5TMR00AA AAAAAAAA
// T: Width of memory read (1, 2, 4, or 8 bytes).
// M: Memory region to write to (0 = Main NSO, 1 = Heap).
// R: Register to load value into.
// A: Immediate offset to use from memory region base.
// 5TMR10AA AAAAAAAA
// T: Width of memory read(1, 2, 4, or 8 bytes).
// M: Ignored.
// R: Register to use as base address and to load value into.
// A: Immediate offset to use from register R.
byte operationWidth = instruction[OperationWidthIndex];
MemoryRegion memoryRegion = (MemoryRegion)instruction[MemoryRegionIndex];
Register destinationRegister = context.GetRegister(instruction[DestinationRegisterIndex]);
byte useDestinationAsSourceIndex = instruction[UseDestinationAsSourceIndex];
ulong address = InstructionHelper.GetImmediate(instruction, OffsetImmediateIndex, OffsetImmediateSize);
Pointer sourceMemory;
switch (useDestinationAsSourceIndex)
{
case 0:
// Don't use the source register as an additional address offset.
sourceMemory = MemoryHelper.EmitPointer(memoryRegion, address, context);
break;
case 1:
// Use the source register as the base address.
sourceMemory = MemoryHelper.EmitPointer(destinationRegister, address, context);
break;
default:
throw new TamperCompilationException($"Invalid source mode {useDestinationAsSourceIndex} in Atmosphere cheat");
}
InstructionHelper.EmitMov(operationWidth, context, destinationRegister, sourceMemory);
}
}
}
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