public virtual Instruction interpret()
{
int opcode = cpu.fetchOpcode();
Instruction insn = Decoder.instruction(opcode);
if (log.TraceEnabled)
{
log.trace(string.Format("Interpreting 0x{0:X8}: [0x{1:X8}] - {2}", cpu.pc - 4, opcode, insn.disasm(cpu.pc - 4, opcode)));
}
insn.interpret(this, opcode);
if (RuntimeContext.debugCodeBlockCalls)
{
if (insn == Instructions.JAL)
{
RuntimeContext.debugCodeBlockStart(cpu, cpu.pc);
}
else if (insn == Instructions.JR && ((opcode >> 21) & 31) == Common._ra)
{
int opcodeCaller = cpu.memory.read32(cpu._ra - 8);
Instruction insnCaller = Decoder.instruction(opcodeCaller);
int codeBlockStart = cpu.pc;
if (insnCaller == Instructions.JAL)
{
codeBlockStart = jumpTarget(cpu.pc, (opcodeCaller) & 0x3FFFFFF);
}
RuntimeContext.debugCodeBlockEnd(cpu, codeBlockStart, cpu._ra);
}
}
return(insn);
}
public virtual void interpretDelayslot()
{
int opcode = cpu.nextOpcode();
Instruction insn = Decoder.instruction(opcode);
if (log.TraceEnabled)
{
log.trace(string.Format("Interpreting 0x{0:X8}: [0x{1:X8}] - {2}", cpu.pc - 4, opcode, insn.disasm(cpu.pc - 4, opcode)));
}
insn.interpret(this, opcode);
cpu.nextPc();
}