forked from Mirror/Ryujinx
0c1ea1212a
* 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
72 lines
2.8 KiB
C#
72 lines
2.8 KiB
C#
using Ryujinx.HLE.Exceptions;
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using Ryujinx.HLE.HOS.Tamper.Operations;
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namespace Ryujinx.HLE.HOS.Tamper.CodeEmitters
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{
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/// <summary>
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/// Code type 3 allows for iterating in a loop a fixed number of times.
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/// </summary>
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class StartEndLoop
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{
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private const int StartOrEndIndex = 1;
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private const int IterationRegisterIndex = 3;
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private const int IterationsImmediateIndex = 8;
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private const int IterationsImmediateSize = 8;
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private const byte LoopBegin = 0;
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private const byte LoopEnd = 1;
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public static void Emit(byte[] instruction, CompilationContext context)
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{
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// 300R0000 VVVVVVVV
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// R: Register to use as loop counter.
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// V: Number of iterations to loop.
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// 310R0000
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byte mode = instruction[StartOrEndIndex];
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byte iterationRegisterIndex = instruction[IterationRegisterIndex];
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switch (mode)
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{
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case LoopBegin:
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// Just start a new compilation block and parse the instruction itself at the end.
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context.BlockStack.Push(new OperationBlock(instruction));
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return;
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case LoopEnd:
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break;
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default:
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throw new TamperCompilationException($"Invalid loop {mode} in Atmosphere cheat");
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}
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// Use the loop begin instruction stored in the stack.
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instruction = context.CurrentBlock.BaseInstruction;
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CodeType codeType = InstructionHelper.GetCodeType(instruction);
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if (codeType != CodeType.StartEndLoop)
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{
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throw new TamperCompilationException($"Loop end does not match code type {codeType} in Atmosphere cheat");
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}
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// Validate if the register in the beginning and end are the same.
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byte oldIterationRegisterIndex = instruction[IterationRegisterIndex];
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if (iterationRegisterIndex != oldIterationRegisterIndex)
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{
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throw new TamperCompilationException($"The register used for the loop changed from {oldIterationRegisterIndex} to {iterationRegisterIndex} in Atmosphere cheat");
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}
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Register iterationRegister = context.GetRegister(iterationRegisterIndex);
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ulong immediate = InstructionHelper.GetImmediate(instruction, IterationsImmediateIndex, IterationsImmediateSize);
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// Create a loop block with the current operations and nest it in the upper
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// block of the stack.
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ForBlock block = new ForBlock(immediate, iterationRegister, context.CurrentOperations);
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context.BlockStack.Pop();
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context.CurrentOperations.Add(block);
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}
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}
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}
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