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Add an implementation of the *JAM instruction that passes HarteTest

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This commit is contained in:
Adrian Conlon 2024-01-06 22:44:59 +00:00
parent 617abbb450
commit 3ebc321c59
2 changed files with 18 additions and 12 deletions
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1
M6502/inc/mos6502.h
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@ -190,6 +190,7 @@ namespace EightBit {
void rra(uint8_t value) noexcept;
void slo(uint8_t value) noexcept;
void sre(uint8_t value) noexcept;
void jam() noexcept;
// Unconditional page fixup cycle required
void fixup(const register16_t address, const uint8_t unfixed_page) noexcept {

29
M6502/src/mos6502.cpp
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@ -113,7 +113,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x00: fetchByte(); interrupt(); break; // BRK (implied)
case 0x01: A() = orr(A(), AM_IndexedIndirectX()); break; // ORA (indexed indirect X)
case 0x02: break;
case 0x02: jam(); break; // *JAM
case 0x03: slo(AM_IndexedIndirectX()); break; // *SLO (indexed indirect X)
case 0x04: AM_ZeroPage(); break; // *NOP (zero page)
case 0x05: A() = orr(A(), AM_ZeroPage()); break; // ORA (zero page)
@ -130,7 +130,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x10: branch(negative() == 0); break; // BPL (relative)
case 0x11: A() = orr(A(), AM_IndirectIndexedY()); break; // ORA (indirect indexed Y)
case 0x12: break;
case 0x12: jam(); break; // *JAM
case 0x13: slo_IndirectIndexedY(); break; // *SLO (indirect indexed Y)
case 0x14: AM_ZeroPageX(); break; // *NOP (zero page, X)
case 0x15: A() = orr(A(), AM_ZeroPageX()); break; // ORA (zero page, X)
@ -147,7 +147,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x20: jsr(); break; // JSR (absolute)
case 0x21: A() = andr(A(), AM_IndexedIndirectX()); break; // AND (indexed indirect X)
case 0x22: break;
case 0x22: jam(); break; // *JAM
case 0x23: rla(AM_IndexedIndirectX()); break; // *RLA (indexed indirect X)
case 0x24: bit(A(), AM_ZeroPage()); break; // BIT (zero page)
case 0x25: A() = andr(A(), AM_ZeroPage()); break; // AND (zero page)
@ -164,7 +164,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x30: branch(negative()); break; // BMI (relative)
case 0x31: A() = andr(A(), AM_IndirectIndexedY()); break; // AND (indirect indexed Y)
case 0x32: break;
case 0x32: jam(); break; // *JAM
case 0x33: rla_IndirectIndexedY(); break; // *RLA (indirect indexed Y)
case 0x34: AM_ZeroPageX(); break; // *NOP (zero page, X)
case 0x35: A() = andr(A(), AM_ZeroPageX()); break; // AND (zero page, X)
@ -181,7 +181,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x40: memoryRead(PC()); rti(); break; // RTI (implied)
case 0x41: A() = eorr(A(), AM_IndexedIndirectX()); break; // EOR (indexed indirect X)
case 0x42: break;
case 0x42: jam(); break; // *JAM
case 0x43: sre(AM_IndexedIndirectX()); break; // *SRE (indexed indirect X)
case 0x44: AM_ZeroPage(); break; // *NOP (zero page)
case 0x45: A() = eorr(A(), AM_ZeroPage()); break; // EOR (zero page)
@ -198,7 +198,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x50: branch(overflow() == 0); break; // BVC (relative)
case 0x51: A() = eorr(A(), AM_IndirectIndexedY()); break; // EOR (indirect indexed Y)
case 0x52: break;
case 0x52: jam(); break; // *JAM
case 0x53: sre_IndirectIndexedY(); break; // *SRE (indirect indexed Y)
case 0x54: AM_ZeroPageX(); break; // *NOP (zero page, X)
case 0x55: A() = eorr(A(), AM_ZeroPageX()); break; // EOR (zero page, X)
@ -215,7 +215,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x60: memoryRead(PC()); rts(); break; // RTS (implied)
case 0x61: A() = adc(A(), AM_IndexedIndirectX()); break; // ADC (indexed indirect X)
case 0x62: break;
case 0x62: jam(); break; // *JAM
case 0x63: rra(AM_IndexedIndirectX()); break; // *RRA (indexed indirect X)
case 0x64: AM_ZeroPage(); break; // *NOP (zero page)
case 0x65: A() = adc(A(), AM_ZeroPage()); break; // ADC (zero page)
@ -232,7 +232,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x70: branch(overflow()); break; // BVS (relative)
case 0x71: A() = adc(A(), AM_IndirectIndexedY()); break; // ADC (indirect indexed Y)
case 0x72: break;
case 0x72: jam(); break; // *JAM
case 0x73: rra_IndirectIndexedY(); break; // *RRA (indirect indexed Y)
case 0x74: AM_ZeroPageX(); break; // *NOP (zero page, X)
case 0x75: A() = adc(A(), AM_ZeroPageX()); break; // ADC (zero page, X)
@ -266,7 +266,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0x90: branch(carry() == 0); break; // BCC (relative)
case 0x91: sta_IndirectIndexedY(); break; // STA (indirect indexed Y)
case 0x92: break;
case 0x92: jam(); break; // *JAM
case 0x93: break;
case 0x94: memoryWrite(Address_ZeroPageX(), Y()); break; // STY (zero page, X)
case 0x95: memoryWrite(Address_ZeroPageX(), A()); break; // STA (zero page, X)
@ -300,7 +300,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0xb0: branch(carry()); break; // BCS (relative)
case 0xb1: A() = through(AM_IndirectIndexedY()); break; // LDA (indirect indexed Y)
case 0xb2: break;
case 0xb2: jam(); break; // *JAM
case 0xb3: A() = X() = through(AM_IndirectIndexedY()); break; // *LAX (indirect indexed Y)
case 0xb4: Y() = through(AM_ZeroPageX()); break; // LDY (zero page, X)
case 0xb5: A() = through(AM_ZeroPageX()); break; // LDA (zero page, X)
@ -334,7 +334,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0xd0: branch(zero() == 0); break; // BNE (relative)
case 0xd1: cmp(A(), AM_IndirectIndexedY()); break; // CMP (indirect indexed Y)
case 0xd2: break;
case 0xd2: jam(); break; // *JAM
case 0xd3: dcp_IndirectIndexedY(); break; // *DCP (indirect indexed Y)
case 0xd4: AM_ZeroPageX(); break; // *NOP (zero page, X)
case 0xd5: cmp(A(), AM_ZeroPageX()); break; // CMP (zero page, X)
@ -368,7 +368,7 @@ int EightBit::MOS6502::execute() noexcept {
case 0xf0: branch(zero()); break; // BEQ (relative)
case 0xf1: A() = sbc(A(), AM_IndirectIndexedY()); break; // SBC (indirect indexed Y)
case 0xf2: break;
case 0xf2: jam(); break; // *JAM
case 0xf3: isb_IndirectIndexedY(); break; // *ISB (indirect indexed Y)
case 0xf4: AM_ZeroPageX(); break; // *NOP (zero page, X)
case 0xf5: A() = sbc(A(), AM_ZeroPageX()); break; // SBC (zero page, X)
@ -766,6 +766,11 @@ void EightBit::MOS6502::sre(const uint8_t value) noexcept {
A() = eorr(A(), BUS().DATA());
}
void EightBit::MOS6502::jam() noexcept {
memoryRead(PC());
memoryRead(PC()--);
}
//
void EightBit::MOS6502::sta_AbsoluteX() noexcept {