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namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
{
/// <summary>
/// Code type 0 allows writing a static value to a memory address.
/// </summary>
class StoreConstantToAddress
{
private const int OperationWidthIndex = 1;
private const int MemoryRegionIndex = 2;
private const int OffsetRegisterIndex = 3;
private const int OffsetImmediateIndex = 6;
private const int ValueImmediateIndex = 16;
private const int OffsetImmediateSize = 10;
private const int ValueImmediateSize8 = 8;
private const int ValueImmediateSize16 = 16;
public static void Emit(byte[] instruction, CompilationContext context)
{
// 0TMR00AA AAAAAAAA VVVVVVVV (VVVVVVVV)
// T: Width of memory write(1, 2, 4, or 8 bytes).
// M: Memory region to write to(0 = Main NSO, 1 = Heap).
// R: Register to use as an offset from memory region base.
// A: Immediate offset to use from memory region base.
// V: Value to write.
byte operationWidth = instruction[OperationWidthIndex];
MemoryRegion memoryRegion = (MemoryRegion)instruction[MemoryRegionIndex];
Register offsetRegister = context.GetRegister(instruction[OffsetRegisterIndex]);
ulong offsetImmediate = InstructionHelper.GetImmediate(instruction, OffsetImmediateIndex, OffsetImmediateSize);
Pointer dstMem = MemoryHelper.EmitPointer(memoryRegion, offsetRegister, offsetImmediate, context);
int valueImmediateSize = operationWidth <= 4 ? ValueImmediateSize8 : ValueImmediateSize16;
ulong valueImmediate = InstructionHelper.GetImmediate(instruction, ValueImmediateIndex, valueImmediateSize);
Value<ulong> storeValue = new(valueImmediate);
InstructionHelper.EmitMov(operationWidth, context, dstMem, storeValue);
}
}
}
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