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Adding most of the transfer instructions

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This commit is contained in:
Anonymus Raccoon
2020-04-07 22:40:53 +02:00
parent a40bfd1c3c
commit f35427f28a
3 changed files with 337 additions and 8 deletions
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sources/CPU/Instructions/TransferRegisters.cpp
+76
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@@ -48,4 +48,80 @@ namespace ComSquare::CPU
}
return 0;
}
int CPU::TCD(uint24_t, AddressingMode)
{
this->_registers.d = this->_registers.a;
this->_registers.p.n = this->_registers.d & 0x8000u;
this->_registers.p.z = this->_registers.d == 0;
return 0;
}
int CPU::TCS(uint24_t, AddressingMode)
{
this->_registers.s = this->_registers.a;
if (this->_isEmulationMode)
this->_registers.sh = 1;
return 0;
}
int CPU::TDC(uint24_t, AddressingMode)
{
this->_registers.a = this->_registers.d;
this->_registers.p.n = this->_registers.a & 0x8000u;
this->_registers.p.z = this->_registers.a == 0;
return 0;
}
int CPU::TSC(uint24_t, AddressingMode)
{
this->_registers.a = this->_registers.s;
this->_registers.p.n = this->_registers.a & 0x8000u;
this->_registers.p.z = this->_registers.a == 0;
return 0;
}
int CPU::TSX(uint24_t, AddressingMode)
{
unsigned negativeFlag = this->_registers.p.x_b ? 0x80u : 0x8000u;
this->_registers.x = this->_registers.s;
if (this->_registers.p.x_b)
this->_registers.xh = 0;
this->_registers.p.n = this->_registers.x & negativeFlag;
this->_registers.p.z = this->_registers.x == 0;
return 0;
}
int CPU::TXA(uint24_t, AddressingMode)
{
unsigned negativeFlag = this->_registers.p.m ? 0x80u : 0x8000u;
if (this->_registers.p.m)
this->_registers.al = this->_registers.xl;
else {
this->_registers.a = this->_registers.x;
if (this->_registers.p.x_b)
this->_registers.ah = 0;
}
this->_registers.p.n = this->_registers.a & negativeFlag;
this->_registers.p.z = this->_registers.a == 0;
return 0;
}
int CPU::TYA(uint24_t, AddressingMode)
{
unsigned negativeFlag = this->_registers.p.m ? 0x80u : 0x8000u;
if (this->_registers.p.m)
this->_registers.al = this->_registers.yl;
else {
this->_registers.a = this->_registers.y;
if (this->_registers.p.x_b)
this->_registers.ah = 0;
}
this->_registers.p.n = this->_registers.a & negativeFlag;
this->_registers.p.z = this->_registers.a == 0;
return 0;
}
}