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Implementing some addressing modes

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This commit is contained in:
AnonymusRaccoon
2020-02-10 17:50:48 +01:00
parent f516e7ec66
commit 04ea6f25d0
3 changed files with 19 additions and 10 deletions
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sources/CPU/CPU.cpp
+13 -3
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@@ -5,6 +5,7 @@
#include "CPU.hpp"
#include <utility>
#include <iostream>
#include "../Exceptions/NotImplementedException.hpp"
#include "../Exceptions/InvalidAddress.hpp"
#include "../Exceptions/InvalidOpcode.hpp"
@@ -239,18 +240,27 @@ namespace ComSquare::CPU
uint24_t CPU::_getAbsoluteAddr()
{
uint24_t addr = this->_registers.dbr << 16u;
addr += this->_bus->read(this->_registers.pac++) << 8u;
addr += this->_bus->read(this->_registers.pac++);
addr += this->_bus->read(this->_registers.pac++) << 8u;
return addr;
}
uint24_t CPU::_getAbsoluteLongAddr()
{
return 0;
uint24_t addr = this->_bus->read(this->_registers.pac++);
addr += this->_bus->read(this->_registers.pac++) << 8u;
addr += this->_bus->read(this->_registers.pac++) << 16u;
return addr;
}
uint24_t CPU::_getDirectIndirectIndexedAddr()
{
return 0;
uint16_t dp = this->_bus->read(this->_registers.pac++) + this->_registers.d;
std::cout << "DP: " << std::hex << dp << std::endl;
uint24_t base = this->_bus->read(dp);
std::cout << "Base: " << std::hex << base << std::endl;
base += this->_bus->read(dp + 1) << 8u;
base += this->_registers.dbr << 16u;
return base + this->_registers.y;
}
}