Ryujinx/Ryujinx.HLE/HOS/Tamper/CodeEmitters/LoadRegisterWithMemory.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

59 lines
2.5 KiB
C#

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);
}
}
}