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Instruction length fixes

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This commit is contained in:
scawful
2023-12-03 06:16:17 -05:00
parent ca9cc42d6b
commit db91b0401a
4 changed files with 83 additions and 31 deletions
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104
src/app/emu/cpu.cc
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@@ -391,17 +391,26 @@ void CPU::ExecuteInstruction(uint8_t opcode) {
{
BRK();
std::cout << "BRK" << std::endl;
// Print all the registers
std::cout << "A: " << std::hex << std::setw(2) << std::setfill('0') << (int)A << std::endl;
std::cout << "X: " << std::hex << std::setw(2) << std::setfill('0') << (int)X << std::endl;
std::cout << "Y: " << std::hex << std::setw(2) << std::setfill('0') << (int)Y << std::endl;
std::cout << "S: " << std::hex << std::setw(2) << std::setfill('0') << (int)SP() << std::endl;
std::cout << "PC: " << std::hex << std::setw(4) << std::setfill('0') << (int)PC << std::endl;
std::cout << "PB: " << std::hex << std::setw(2) << std::setfill('0') << (int)PB << std::endl;
std::cout << "D: " << std::hex << std::setw(4) << std::setfill('0') << (int)D << std::endl;
std::cout << "DB: " << std::hex << std::setw(2) << std::setfill('0') << (int)DB << std::endl;
std::cout << "E: " << std::hex << std::setw(2) << std::setfill('0') << (int)E << std::endl;
// Print all the registers
std::cout << "A: " << std::hex << std::setw(2) << std::setfill('0')
<< (int)A << std::endl;
std::cout << "X: " << std::hex << std::setw(2) << std::setfill('0')
<< (int)X << std::endl;
std::cout << "Y: " << std::hex << std::setw(2) << std::setfill('0')
<< (int)Y << std::endl;
std::cout << "S: " << std::hex << std::setw(2) << std::setfill('0')
<< (int)SP() << std::endl;
std::cout << "PC: " << std::hex << std::setw(4) << std::setfill('0')
<< (int)PC << std::endl;
std::cout << "PB: " << std::hex << std::setw(2) << std::setfill('0')
<< (int)PB << std::endl;
std::cout << "D: " << std::hex << std::setw(4) << std::setfill('0')
<< (int)D << std::endl;
std::cout << "DB: " << std::hex << std::setw(2) << std::setfill('0')
<< (int)DB << std::endl;
std::cout << "E: " << std::hex << std::setw(2) << std::setfill('0')
<< (int)E << std::endl;
break;
}
@@ -1533,11 +1542,14 @@ uint8_t CPU::GetInstructionLength(uint8_t opcode) {
case 0x7C: // JMP Absolute Indexed Indirect
case 0xFC: // JSR Absolute Indexed Indirect
case 0xDC: // JMP Absolute Indirect Long
case 0x6B: // RTL
case 0x80: // BRA Relative
case 0x82: // BRL Relative Long
PC = next_pc_;
return 0;
case 0x6B: // RTL
PC = next_pc_;
case 0x60: // RTS
PC = last_call_frame_;
return 0;
// Branch Instructions (BCC, BCS, BNE, BEQ, etc.)
@@ -1602,18 +1614,6 @@ uint8_t CPU::GetInstructionLength(uint8_t opcode) {
return 2;
}
case 0x80: // BRA Relative
PC = next_pc_;
return 0;
case 0x82: // BRL Relative Long
PC = next_pc_;
return 0;
case 0x60: // RTS
PC = last_call_frame_;
return 0;
case 0x18: // CLC
case 0xD8: // CLD
case 0x58: // CLI
@@ -1645,6 +1645,7 @@ uint8_t CPU::GetInstructionLength(uint8_t opcode) {
case 0xA8: // TAY
case 0xBA: // TSX
case 0x8A: // TXA
case 0x9B: // TXY
case 0x9A: // TXS
case 0x98: // TYA
case 0x0A: // ASL Accumulator
@@ -1657,10 +1658,17 @@ uint8_t CPU::GetInstructionLength(uint8_t opcode) {
case 0x7B: // TDC
case 0x3B: // TSC
case 0xEB: // XBA
case 0xCB: // WAI
case 0xDB: // STP
case 0x4A: // LSR Accumulator
case 0x6A: // ROR Accumulator
return 1;
case 0xC2: // REP
case 0xE2: // SEP
case 0xE4: // CPX Direct Page
case 0xC4: // CPY Direct Page
case 0xD6: // DEC Direct Page Indexed, X
case 0x45: // EOR Direct Page
case 0xA5: // LDA Direct Page
case 0x05: // ORA Direct Page
@@ -1749,6 +1757,20 @@ uint8_t CPU::GetInstructionLength(uint8_t opcode) {
case 0x03: // ORA Stack Relative
case 0x13: // ORA SR Indirect Indexed, Y
case 0x07: // ORA Direct Page Indirect Long
case 0x11: // ORA DP Indirect Indexed, Y
case 0x12: // ORA DP Indirect
case 0x15: // ORA DP Indexed, X
case 0x17: // ORA DP Indirect Long Indexed, Y
case 0x26: // ROL Direct Page
case 0x36: // ROL Direct Page Indexed, X
case 0x66: // ROR Direct Page
case 0x76: // ROR Direct Page Indexed, X
case 0x42: // WDM
case 0xD3: // CMP Stack Relative Indirect Indexed, Y
case 0x52: // EOR Direct Page Indirect
case 0xA4: // LDA Direct Page
case 0xA6: // LDX Direct Page
case 0xD4: // PEI
return 2;
case 0x69: // ADC Immediate
@@ -1785,6 +1807,8 @@ uint8_t CPU::GetInstructionLength(uint8_t opcode) {
case 0x39: // AND Absolute Indexed Y
case 0x9C: // STZ Absolute Indexed X
case 0x9D: // STA Absolute Indexed X
case 0x99: // STA Absolute Indexed Y
case 0x3C: // BIT Absolute Indexed X
case 0x7D: // ADC Absolute Indexed, X
case 0x79: // ADC Absolute Indexed, Y
case 0x6D: // ADC Absolute
@@ -1796,8 +1820,26 @@ uint8_t CPU::GetInstructionLength(uint8_t opcode) {
case 0xD9: // CMP Absolute Indexed, Y
case 0xDD: // CMP Absolute Indexed, X
case 0x0C: // TSB Absolute
case 0x1C: // TRB Absolute
case 0xF9: // SBC Absolute Indexed, Y
case 0xFD: // SBC Absolute Indexed, X
case 0x2C: // BIT Absolute
case 0x2E: // ROL Absolute
case 0x3E: // ROL Absolute Indexed, X
case 0x4E: // LSR Absolute
case 0x5E: // LSR Absolute Indexed, X
case 0xDE: // DEC Absolute Indexed, X
case 0xEE: // INC Absolute
case 0xB9: // LDA Absolute Indexed, Y
case 0xBE: // LDX Absolute Indexed, Y
case 0xFE: // INC Absolute Indexed, X
case 0xF4: // PEA
case 0x62: // PER
case 0x6E: // ROR Absolute
case 0x7E: // ROR Absolute Indexed, X
return 3;
case 0x6F: // ADC Absolute Long
case 0x2F: // AND Absolute Long
case 0xCF: // CMP Absolute Long
case 0x4F: // EOR Absolute Long
@@ -1805,16 +1847,22 @@ uint8_t CPU::GetInstructionLength(uint8_t opcode) {
case 0x0F: // ORA Absolute Long
case 0xEF: // SBC Absolute Long
case 0x8F: // STA Absolute Long
case 0x5F: // EOR Absolute Long Indexed, X
case 0x3F: // AND Absolute Long Indexed X
case 0x7F: // ADC Absolute Long Indexed, X
case 0x6F: // ADC Absolute Long
case 0x3F: // AND Absolute Long Indexed, X
case 0xDF: // CMP Absolute Long Indexed, X
case 0x5F: // EOR Absolute Long Indexed, X
case 0x9F: // STA Absolute Long Indexed, X
case 0x1F: // ORA Absolute Long Indexed, X
case 0xBF: // LDA Absolute Long Indexed, X
case 0x9E: // STZ Absolute Long Indexed, X
case 0xFF: // SBC Absolute Long Indexed, X
return 4;
default:
auto mnemonic = opcode_to_mnemonic.at(opcode);
std::cerr << "Unknown instruction length: " << std::hex
<< static_cast<int>(opcode) << ", " << mnemonic << std::endl;
throw std::runtime_error("Unknown instruction length");
return 1; // Default to 1 as a safe fallback
}
}

3
src/app/emu/memory/memory.h
View File

@@ -270,6 +270,7 @@ class MemoryImpl : public Memory, public Loggable {
} else {
// Handle stack underflow
std::cout << "Stack underflow!" << std::endl;
throw std::runtime_error("Stack underflow!");
}
}
@@ -279,7 +280,7 @@ class MemoryImpl : public Memory, public Loggable {
} else {
// Handle stack overflow
std::cout << "Stack overflow!" << std::endl;
return 0;
throw std::runtime_error("Stack overflow!");
}
}

3
src/app/emu/memory/mock_memory.h
View File

@@ -140,7 +140,7 @@ class MockMemory : public Memory {
memory_[address + 1] = (value >> 8) & 0xFF;
});
ON_CALL(*this, PushByte(::testing::_)).WillByDefault([this](uint8_t value) {
memory_.at(SP_) = value;
memory_.at(SP_--) = value;
});
ON_CALL(*this, PopByte()).WillByDefault([this]() {
uint8_t value = memory_.at(SP_);
@@ -151,6 +151,7 @@ class MockMemory : public Memory {
.WillByDefault([this](uint16_t value) {
memory_.at(SP_) = value & 0xFF;
memory_.at(SP_ + 1) = (value >> 8) & 0xFF;
this->SetSP(SP_ - 2);
});
ON_CALL(*this, PopWord()).WillByDefault([this]() {
uint16_t value = static_cast<uint16_t>(memory_.at(SP_)) |