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using Ryujinx.HLE.Exceptions;
using Ryujinx.HLE.HOS.Tamper.Operations;
namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
{
/// <summary>
/// Code type 10 allows writing a register to memory.
/// </summary>
class StoreRegisterToMemory
{
private const int OperationWidthIndex = 1;
private const int SourceRegisterIndex = 2;
private const int AddressRegisterIndex = 3;
private const int IncrementAddressRegisterIndex = 4;
private const int AddressingTypeIndex = 5;
private const int RegisterOrMemoryRegionIndex = 6;
private const int OffsetImmediateIndex = 7;
private const int AddressRegister = 0;
private const int AddressRegisterWithOffsetRegister = 1;
private const int OffsetImmediate = 2;
private const int MemoryRegionWithOffsetRegister = 3;
private const int MemoryRegionWithOffsetImmediate = 4;
private const int MemoryRegionWithOffsetRegisterAndImmediate = 5;
private const int OffsetImmediateSize1 = 1;
private const int OffsetImmediateSize9 = 9;
public static void Emit(byte[] instruction, CompilationContext context)
{
// ATSRIOxa (aaaaaaaa)
// T: Width of memory write (1, 2, 4, or 8 bytes).
// S: Register to write to memory.
// R: Register to use as base address.
// I: Increment register flag (0 = do not increment R, 1 = increment R by T).
// O: Offset type, see below.
// x: Register used as offset when O is 1, Memory type when O is 3, 4 or 5.
// a: Value used as offset when O is 2, 4 or 5.
byte operationWidth = instruction[OperationWidthIndex];
Register sourceRegister = context.GetRegister(instruction[SourceRegisterIndex]);
Register addressRegister = context.GetRegister(instruction[AddressRegisterIndex]);
byte incrementAddressRegister = instruction[IncrementAddressRegisterIndex];
byte offsetType = instruction[AddressingTypeIndex];
byte registerOrMemoryRegion = instruction[RegisterOrMemoryRegionIndex];
int immediateSize = instruction.Length <= 8 ? OffsetImmediateSize1 : OffsetImmediateSize9;
ulong immediate = InstructionHelper.GetImmediate(instruction, OffsetImmediateIndex, immediateSize);
Pointer destinationMemory;
switch (offsetType)
{
case AddressRegister:
// *($R) = $S
destinationMemory = MemoryHelper.EmitPointer(addressRegister, context);
break;
case AddressRegisterWithOffsetRegister:
// *($R + $x) = $S
Register offsetRegister = context.GetRegister(registerOrMemoryRegion);
destinationMemory = MemoryHelper.EmitPointer(addressRegister, offsetRegister, context);
break;
case OffsetImmediate:
// *(#a) = $S
destinationMemory = MemoryHelper.EmitPointer(addressRegister, immediate, context);
break;
case MemoryRegionWithOffsetRegister:
// *(?x + $R) = $S
destinationMemory = MemoryHelper.EmitPointer((MemoryRegion)registerOrMemoryRegion, addressRegister, context);
break;
case MemoryRegionWithOffsetImmediate:
// *(?x + #a) = $S
destinationMemory = MemoryHelper.EmitPointer((MemoryRegion)registerOrMemoryRegion, immediate, context);
break;
case MemoryRegionWithOffsetRegisterAndImmediate:
// *(?x + #a + $R) = $S
destinationMemory = MemoryHelper.EmitPointer((MemoryRegion)registerOrMemoryRegion, addressRegister, immediate, context);
break;
default:
throw new TamperCompilationException($"Invalid offset type {offsetType} in Atmosphere cheat");
}
InstructionHelper.EmitMov(operationWidth, context, destinationMemory, sourceRegister);
switch (incrementAddressRegister)
{
case 0:
// Don't increment the address register by operationWidth.
break;
case 1:
// Increment the address register by operationWidth.
IOperand increment = new Value<ulong>(operationWidth);
context.CurrentOperations.Add(new OpAdd<ulong>(addressRegister, addressRegister, increment));
break;
default:
throw new TamperCompilationException($"Invalid increment mode {incrementAddressRegister} in Atmosphere cheat");
}
}
}
}
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