public static bool IsJump(ArmInstruction instruction)
{
return(!instruction.Details.BelongsToGroup(ArmInstructionGroupId.ARM_GRP_CALL) &&
(instruction.Details.BelongsToGroup(ArmInstructionGroupId.ARM_GRP_BRANCH_RELATIVE) ||
instruction.Details.BelongsToGroup(ArmInstructionGroupId.ARM_GRP_JUMP) ||
instruction.Details.IsRegisterExplicitlyWritten(ArmRegisterId.ARM_REG_PC)));
}
private IArmInstruction[] ConvertToArm(uint[] aRawInstructions, uint aStartingAddress)
{
// TODO: optimise this
List <IArmInstruction> ret = new List <IArmInstruction>();
//
uint address = aStartingAddress;
for (int i = 0; i < aRawInstructions.Length; i++, address += 4)
{
uint raw = aRawInstructions[i];
foreach (ArmInstruction inst in iArmInstructions)
{
if (inst.Matches(raw))
{
Type type = inst.GetType();
ConstructorInfo ctor = type.GetConstructor(new Type[] { });
ArmInstruction copy = (ArmInstruction)ctor.Invoke(new object[] { });
copy.AIAddress = address;
copy.AIRawValue = raw;
ret.Add(copy);
Disassemble(copy);
break;
}
}
}
//
return(ret.ToArray());
}
private void Read()
{
ulong absoluteFirstOffset = AbsolutePokemonIndexOffset(ActorDataList.First());
// TODO: get rid of the ArmInstruction class and add encoding and decoding functions for
// the instructions used here to CodeGenerationHelper instead.
var firstOffsetInstruction = new ArmInstruction(BitConverter.ToUInt32(executable.Data, (int)absoluteFirstOffset));
if (!firstOffsetInstruction.IsSupported)
{
throw new InvalidOperationException("Cannot read Actor database - maybe an incompatible version was used?");
}
foreach (var actorData in ActorDataList.Where(actorData => actorData.PokemonIndexEditable))
{
var instruction =
new ArmInstruction(BitConverter.ToUInt32(executable.Data, (int)AbsolutePokemonIndexOffset(actorData)));
if (instruction.IsSupported)
{
// It doesn't matter if the instruction is unsupported here because we can rely
// on the hardcoded values PegasusActDatabase.Data.cs and it will be readable after edits.
actorData.PokemonIndex = (CreatureIndex)instruction.Value;
}
}
}
public void Write()
{
// TODO: get rid of the ArmInstruction class and add encoding and decoding functions for
// the instructions used here to CodeGenerationHelper instead.
foreach (var actorData in ActorDataList.Where(actorData => actorData.PokemonIndexEditable))
{
var instruction = new ArmInstruction(BitConverter.ToUInt32(executable.Data,
(int)AbsolutePokemonIndexOffset(actorData)));
if (instruction.IsSupported)
{
instruction.Value = (ushort)actorData.PokemonIndex;
}
else if (instruction.Code == ArmInstructionCode.MovBitmaskImmediateToWRegister)
{
// Replace the unsupported instruction with an equivalent one
instruction = new ArmInstruction(ArmInstructionCode.MovImmediateToWRegister, instruction.Register,
(ushort)actorData.PokemonIndex);
}
BitConverter.GetBytes(instruction.RawInstruction).CopyTo(executable.Data,
(int)AbsolutePokemonIndexOffset(actorData));
}
}
public ArmMachineInstruction(ArmInstruction instruction, Variable[] regVars)
: base(instruction.Details.ConditionCode)
{
Instruction = instruction;
var defs = instruction.Details.AllWrittenRegisters
.Where(reg => reg.Id != ArmRegisterId.ARM_REG_PC)
.Select(reg => regVars[ArmUtil.GetRegisterNumber(reg.Id)]);
if (instruction.Details.BelongsToGroup(ArmInstructionGroupId.ARM_GRP_CALL))
{
defs = defs.Append(regVars[0]).Append(regVars[1])
.Append(regVars[2]).Append(regVars[3]).Append(regVars[16]);
}
if (instruction.Details.UpdateFlags && !instruction.Details.IsRegisterWritten(ArmRegisterId.ARM_REG_CPSR))
{
defs = defs.Append(regVars[16]);
}
VariableDefs.UnionWith(defs);
var uses = instruction.Details.AllReadRegisters
.Where(reg => reg.Id != ArmRegisterId.ARM_REG_PC)
.Select(reg => regVars[ArmUtil.GetRegisterNumber(reg.Id)]);
if (instruction.Details.ConditionCode != ArmConditionCode.ARM_CC_AL)
{
uses = uses.Append(regVars[16]);
}
if (instruction.Id == ArmInstructionId.ARM_INS_BX)
{
uses = uses.Append(regVars[ArmUtil.GetRegisterNumber(instruction.Details.Operands[0].Register.Id)]);
}
if (instruction.Details.BelongsToGroup(ArmInstructionGroupId.ARM_GRP_CALL) ||
instruction.Id == ArmInstructionId.ARM_INS_BX)
{
uses = uses.Append(regVars[0]).Append(regVars[1]).Append(regVars[2]).Append(regVars[3])
.Append(regVars[13]);
}
VariableUses.UnionWith(uses);
for (int i = 0; i < Instruction.Details.Operands.Length; i++)
{
var op = Instruction.Details.Operands[i];
switch (op.Type)
{
case ArmOperandType.Register:
if (op.AccessType == OperandAccessType.Write ||
(Instruction.DisassembleMode == ArmDisassembleMode.Thumb &&
op.AccessType == (OperandAccessType.Read | OperandAccessType.Write) && i == 0))
{
Operands.Add((true, VariableDefs.FirstOrDefault(v =>
v.Location == VariableLocation.Register &&
v.Address == ArmUtil.GetRegisterNumber(op.Register.Id))));
}
else
{
Operands.Add((false, VariableUses.FirstOrDefault(v =>
v.Location == VariableLocation.Register &&
v.Address == ArmUtil.GetRegisterNumber(op.Register.Id))));
if (op.ShiftOperation >= ArmShiftOperation.ARM_SFT_LSL_REG)
{
Operands.Add((false, VariableUses.First(v =>
v.Location == VariableLocation.Register &&
v.Address == ArmUtil.GetRegisterNumber(op.ShiftRegister.Id))));
}
}
break;
case ArmOperandType.Memory:
Operands.Add((false, VariableUses.First(v =>
v.Location == VariableLocation.Register &&
v.Address == ArmUtil.GetRegisterNumber(op.Memory.Base.Id))));
if (op.Memory.Index == null)
{
Operands.Add((false, new Constant((uint)op.Memory.Displacement)));
}
else
{
Operands.Add((false, VariableUses.First(v =>
v.Location == VariableLocation.Register &&
v.Address == ArmUtil.GetRegisterNumber(op.Memory.Index.Id))));
}
if (instruction.Details.WriteBack)
{
Operands.Add((true, VariableDefs.First(v =>
v.Location == VariableLocation.Register &&
v.Address == ArmUtil.GetRegisterNumber(op.Memory.Base.Id))));
}
break;
case ArmOperandType.Immediate:
Operands.Add((false, new Constant((uint)op.Immediate)));
break;
default:
Operands.Add((false, null));
break;
}
}
if (VariableUses.Contains(regVars[16]))
{
FlagsUseOperand = regVars[16];
}
if (VariableDefs.Contains(regVars[16]))
{
FlagsDefOperand = regVars[16];
}
}
internal override void Process(ArmPrologueHelper aProlog)
{
IArmInstruction instruction = base.Instruction;
// Only unconditional instructions are handled
if (instruction.AIConditionCode == TArmInstructionCondition.AL)
{
if (instruction is ArmInstruction)
{
ArmInstruction armInst = (ArmInstruction)instruction;
//
if (armInst is Arm_LoadOrStoreMultiple)
{
Arm_LoadOrStoreMultiple lsmInstruction = (Arm_LoadOrStoreMultiple)instruction;
// We're looking for store operations
if (lsmInstruction.DataTransferType == TArmDataTransferType.EStore)
{
// We're looking for LSM's that involve SP.
if (lsmInstruction.BaseRegister == TArmRegisterType.EArmReg_SP)
{
if (lsmInstruction is Arm_LoadOrStoreMultiple_GP)
{
Arm_LoadOrStoreMultiple_GP gpLsmInstruction = (Arm_LoadOrStoreMultiple_GP)lsmInstruction;
HandleDTOperation(aProlog, gpLsmInstruction.Registers);
}
else if (lsmInstruction is Arm_LoadOrStoreMultiple_VFP)
{
Arm_LoadOrStoreMultiple_VFP vfpLsmInstruction = (Arm_LoadOrStoreMultiple_VFP)lsmInstruction;
HandleDTOperation(aProlog, vfpLsmInstruction.Registers);
}
}
}
}
}
else if (instruction is ThumbInstruction)
{
ThumbInstruction thumbInst = (ThumbInstruction)instruction;
//
if (thumbInst is Thumb_LoadOrStoreMultiple)
{
// Special case that loads or stores multiple registers
Thumb_LoadOrStoreMultiple lsmThumb = (Thumb_LoadOrStoreMultiple)thumbInst;
if (lsmThumb.DataTransferType == TArmDataTransferType.EStore && lsmThumb.Rd == TArmRegisterType.EArmReg_SP)
{
HandleDTOperation(aProlog, lsmThumb.Registers);
}
else
{
}
}
else if (thumbInst is Thumb_LDR_RelativeToPC)
{
// When the Prologue needs to establish a working stack slurry, then often
// the scratch registers are used to build up a large subtraction from SP.
HandleDTLoad(aProlog, thumbInst as Thumb_LDR_RelativeToPC);
}
}
else
{
throw new NotSupportedException("Instruction type not supported");
}
}
}
