public MIPSEvaluator(ROMHandler.ROMHandler rom, ROMHandler.DMATableEntry dma, uint ramadr, RegisterHookDelegate reghook = null, ushort var = 0)
{
BaseAddress = ramadr;
Registers = new uint[32];
Stack = new uint[256 * MIPS.SafetyVal];
StackPos = (int)(128 * MIPS.SafetyVal);
Sections = new OvlSections(rom, dma, 0);
MemoryMap = new List <MemoryRegion>();
MemoryMap.Add(new MemoryRegion(Sections.text, ramadr + Sections.textVA));
MemoryMap.Add(new MemoryRegion(Sections.data, ramadr + Sections.dataVA));
MemoryMap.Add(new MemoryRegion(Sections.rodata, ramadr + Sections.rodataVA));
MemoryMap.Add(new MemoryRegion(Sections.bss, ramadr + Sections.bssVA));
RegisterHook = reghook;
SpecialOps = new List <SpecialOp>();
SpecialOps.Add(new SpecialOp(MIPS.LH((uint)MIPS.Register.R0, 0x1C, (uint)MIPS.Register.A0), MIPS.LH((uint)MIPS.Register.R0, 0x1C, (uint)MIPS.Register.A0), var));
SpecialOps.Add(new SpecialOp(MIPS.LH((uint)MIPS.Register.R0, 0x1C, (uint)MIPS.Register.S0), MIPS.LH((uint)MIPS.Register.R0, 0x1C, (uint)MIPS.Register.A0), var));
Watches = new List <uint>();
}
private void Evaluate(byte[] words, int pos)
{
uint word = Endian.SwapUInt32(BitConverter.ToUInt32(words, pos));
uint imm = 0, calcadr = 0, target = 0;
foreach (SpecialOp sop in SpecialOps)
{
if ((word & sop.Mask) == sop.Opcode)
{
if ((word & 0xFC000000) == 0)
{
Registers[MIPS.GetRD(word)] = sop.Value;
}
else
{
Registers[MIPS.GetRT(word)] = sop.Value;
}
return;
}
}
switch ((MIPS.Opcode)((word >> 26) & 0x3F))
{
case MIPS.Opcode.JAL:
target = MIPS.GetTARGET(word);
Evaluate(words, pos + 4);
ReportResult(target, pos);
Array.Clear(Registers, 1, 15);
Array.Clear(Registers, 24, 4);
Registers[(int)MIPS.Register.RA] = (BaseAddress & 0xFFFFFF) + (uint)(pos + 4);
foreach (MemoryRegion mem in MemoryMap)
{
if (target > (mem.Address & 0xFFFFFF) && mem.Data.Length + (mem.Address & 0xFFFFFF) > target)
{
pos = (int)(target - (BaseAddress & 0xFFFFFF));
break;
}
}
break;
case MIPS.Opcode.SLLV:
Registers[MIPS.GetRD(word)] = Registers[MIPS.GetRT(word)] << (int)MIPS.GetRS(word);
break;
case MIPS.Opcode.ADDIU:
imm = MIPS.GetIMM(word);
if ((imm & 0x8000) != 0)
{
imm |= 0xFFFF0000;
}
Registers[MIPS.GetRT(word)] = Registers[MIPS.GetRS(word)] + imm;
if (MIPS.GetRT(word) == MIPS.GetRS(word) && MIPS.GetRT(word) == (uint)MIPS.Register.SP)
{
StackPos += (short)imm;
}
break;
case MIPS.Opcode.LUI:
Registers[MIPS.GetRT(word)] = MIPS.GetIMM(word) << 16;
break;
case MIPS.Opcode.ANDI:
Registers[MIPS.GetRT(word)] = Registers[MIPS.GetRS(word)] & MIPS.GetIMM(word);
break;
case MIPS.Opcode.ORI:
Registers[MIPS.GetRT(word)] = Registers[MIPS.GetRS(word)] | MIPS.GetIMM(word);
break;
case MIPS.Opcode.SW:
if (MIPS.GetRS(word) == (uint)MIPS.Register.SP)
{
Stack[StackPos + MIPS.GetIMM(word)] = Registers[MIPS.GetRT(word)];
}
break;
/*
* case MIPS.Opcode.LH:
* imm = MIPS.GetIMM(word);
* calcadr = imm + Registers[MIPS.GetRS(word)];
*
* if (MIPS.GetRS(word) == (uint)MIPS.Register.SP)
* {
* Registers[MIPS.GetRT(word)] = Stack[StackPos + imm];
* break;
* }
*
* foreach (MemoryRegion mem in MemoryMap)
* {
* if (calcadr > mem.Address && mem.Data.Length + mem.Address > calcadr)
* {
* Registers[MIPS.GetRT(word)] = (uint)Endian.SwapInt16(BitConverter.ToInt16(mem.Data, (int)(calcadr - mem.Address)));
* break;
* }
* }
* break;
*/
case MIPS.Opcode.LW:
imm = MIPS.GetIMM(word);
if ((imm & 0x8000) != 0)
{
imm |= 0xFFFF0000;
}
calcadr = imm + Registers[MIPS.GetRS(word)];
if (MIPS.GetRS(word) == (uint)MIPS.Register.SP)
{
Registers[MIPS.GetRT(word)] = Stack[StackPos + imm];
break;
}
foreach (MemoryRegion mem in MemoryMap)
{
if (calcadr > mem.Address && mem.Data.Length + mem.Address > calcadr)
{
Registers[MIPS.GetRT(word)] = Endian.SwapUInt32(BitConverter.ToUInt32(mem.Data, (int)(calcadr - mem.Address)));
break;
}
}
break;
/*
* case MIPS.Opcode.LHU:
* imm = MIPS.GetIMM(word);
* if ((imm & 0x8000) != 0) imm |= 0xFFFF0000; //????
* calcadr = imm + Registers[MIPS.GetRS(word)];
*
* if (MIPS.GetRS(word) == (uint)MIPS.Register.SP)
* {
* Registers[MIPS.GetRT(word)] = Stack[StackPos + imm];
* break;
* }
*
* foreach (MemoryRegion mem in MemoryMap)
* {
* if (calcadr > mem.Address && mem.Data.Length + mem.Address > calcadr)
* {
* Registers[MIPS.GetRT(word)] = Endian.SwapUInt16(BitConverter.ToUInt16(mem.Data, (int)(calcadr - mem.Address)));
* break;
* }
* }
* break;
*/
case MIPS.Opcode.TYPE_R:
{
switch ((MIPS.Opcode_R)(word & 0x3F))
{
case MIPS.Opcode_R.SLL:
Registers[MIPS.GetRD(word)] = Registers[MIPS.GetRT(word)] << (int)MIPS.GetSA(word);
break;
case MIPS.Opcode_R.SRA:
case MIPS.Opcode_R.SRL: /*test!*/
Registers[MIPS.GetRD(word)] = Registers[MIPS.GetRT(word)] >> (int)MIPS.GetSA(word);
break;
case MIPS.Opcode_R.ADDU:
Registers[MIPS.GetRD(word)] = Registers[MIPS.GetRT(word)] + Registers[MIPS.GetRS(word)];
break;
case MIPS.Opcode_R.SUBU:
Registers[MIPS.GetRD(word)] = Registers[MIPS.GetRT(word)] - Registers[MIPS.GetRS(word)];
break;
case MIPS.Opcode_R.AND:
Registers[MIPS.GetRD(word)] = Registers[MIPS.GetRT(word)] & Registers[MIPS.GetRS(word)];
break;
case MIPS.Opcode_R.OR:
Registers[MIPS.GetRD(word)] = Registers[MIPS.GetRT(word)] | Registers[MIPS.GetRS(word)];
break;
case MIPS.Opcode_R.XOR:
Registers[MIPS.GetRD(word)] = Registers[MIPS.GetRT(word)] ^ Registers[MIPS.GetRS(word)];
break;
case MIPS.Opcode_R.JR:
if (MIPS.GetRS(word) == (uint)MIPS.Register.RA)
{
Array.Clear(Registers, 1, 15);
Array.Clear(Registers, 24, 4);
pos = (int)Registers[(int)MIPS.Register.RA];
}
break;
default:
break;
}
}
break;
default:
break;
}
if (RegisterHook != null)
{
RegisterHook(Registers);
}
}