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cpu.cpp
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cpu.cpp
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//==============================================================================
// MIPS(R) Architecture For Programmers Volume II-A: The MIPS64(R) Instruction Set Reference Manual
//
// Document Number: MD00087
// Revision 6.06
// December 15, 2016
//
// Copyright (C) Wave Computing, Inc. All rights reserved.
//==============================================================================
#include "platform.h"
#include "cpu.h"
CPU::SYSTEMCALLFUNCTION CPU::SystemCallFunction;
CPU::NATIVEFUNCTION CPU::NativeFunction;
//------------------------------------------------------------------------------
CPU::CPU()
:cop0(*this)
,cop1(*this)
,cop2(*this)
{
// Instruction
Encode = 0;
// CPU
PC = 0;
for (unsigned int i = 0; i < 32; ++i)
{
GPR[i] = 0;
}
// Stack
Stack = new intptr_t[65536];
GPR[29] = (intptr_t)&Stack[65504];
}
//------------------------------------------------------------------------------
CPU::~CPU()
{
delete[] Stack;
}
//------------------------------------------------------------------------------
void CPU::Execute(const void* code)
{
PC = (intptr_t)code;
GPR[25] = PC;
for (;;)
{
intptr_t pc = PC;
// Instruction
Encode = *(int*)pc;
FINSTRUCTION OPCODE = tableOPCODE[opcode];
(this->*OPCODE)();
#if defined(_DEBUG)
// Debug
if (GPR[0] != 0)
__builtin_trap();
#endif
// Not Branch and Jump
if (PC == pc)
{
PC += 4;
}
// Native Function
else if (NativeFunction)
{
NativeFunction(*this);
}
// Exit
if (PC == 0)
break;
}
}
//------------------------------------------------------------------------------
void CPU::BranchDelaySlot()
{
unsigned int encode = Encode;
// Instruction
Encode = *(int*)(PC + 4);
FINSTRUCTION OPCODE = tableOPCODE[opcode];
(this->*OPCODE)();
Encode = encode;
}
//------------------------------------------------------------------------------
void CPU::SetSystemCall(SYSTEMCALLFUNCTION systemCall)
{
SystemCallFunction = systemCall;
}
//------------------------------------------------------------------------------
void CPU::SetNativeFunction(NATIVEFUNCTION nativeFunction)
{
NativeFunction = nativeFunction;
}
//------------------------------------------------------------------------------
void CPU::SignalException(int exception, int argument)
{
switch (exception)
{
case SystemCall:
if (SystemCallFunction)
{
SystemCallFunction(*this, argument);
}
break;
default:
__builtin_trap();
break;
}
}
//------------------------------------------------------------------------------