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https://github.com/mist64/perfect6502.git
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addressing modes
This commit is contained in:
Michael Steil
parent
fde0610048
commit
c856cb77a2
163
perfect6502.c
163
perfect6502.c
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@ -1007,7 +1007,7 @@ initChip()
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setHigh(res);
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#ifdef TEST
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for (int i = 0; i < 63; i++)
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for (int i = 0; i < 62; i++)
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step_quiet();
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cycle = -1;
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@ -1048,6 +1048,10 @@ main()
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#define MAGIC_8 0xEA
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#define MAGIC_16 0xAB1E
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#define MAGIC_INDX 0x1328
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#define MAGIC_INDY 0x1979
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#define X_OFFSET 5
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#define Y_OFFSET 10
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#define IS_READ_CYCLE (isNodeHigh(clk0) && isNodeHigh(rw))
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#define IS_WRITE_CYCLE (isNodeHigh(clk0) && !isNodeHigh(rw))
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@ -1057,8 +1061,60 @@ struct {
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BOOL crash;
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int length;
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int cycles;
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BOOL zp;
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BOOL abs;
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BOOL zpx;
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BOOL absx;
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BOOL zpy;
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BOOL absy;
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BOOL indx;
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BOOL indy;
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BOOL reads;
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BOOL writes;
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} data[256];
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uint16_t initial_s, initial_p, initial_a, initial_x, initial_y;
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void
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setup_memory(uint8_t opcode)
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{
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bzero(memory, 65536);
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memory[0xFFFC] = SETUP_ADDR & 0xFF;
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memory[0xFFFD] = SETUP_ADDR >> 8;
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uint16_t addr = SETUP_ADDR;
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memory[addr++] = 0xA2; /* LDA #S */
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initial_s = addr;
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memory[addr++] = 0xFF;
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memory[addr++] = 0x9A; /* TXS */
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memory[addr++] = 0xA9; /* LDA #P */
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initial_p = addr;
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memory[addr++] = 0;
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memory[addr++] = 0x48; /* PHA */
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memory[addr++] = 0xA9; /* LHA #A */
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initial_a = addr;
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memory[addr++] = 0;
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memory[addr++] = 0xA2; /* LDX #X */
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initial_x = addr;
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memory[addr++] = 0;
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memory[addr++] = 0xA0; /* LDY #Y */
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initial_y = addr;
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memory[addr++] = 0;
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memory[addr++] = 0x28; /* PLP */
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memory[addr++] = 0x4C; /* JMP */
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memory[addr++] = INSTRUCTION_ADDR & 0xFF;
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memory[addr++] = INSTRUCTION_ADDR >> 8;
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memory[INSTRUCTION_ADDR + 0] = opcode;
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memory[INSTRUCTION_ADDR + 1] = 0;
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memory[INSTRUCTION_ADDR + 2] = 0;
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memory[INSTRUCTION_ADDR + 3] = 0;
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memory[0xFFFE] = BRK_VECTOR & 0xFF;
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memory[0xFFFF] = BRK_VECTOR >> 8;
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memory[BRK_VECTOR] = 0x00; /* loop there */
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}
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int
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main()
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{
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@ -1069,42 +1125,14 @@ main()
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for (int opcode = 0x00; opcode <= 0xFF; opcode++) {
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// for (int opcode = 0xA9; opcode <= 0xAA; opcode++) {
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// for (int opcode = 0xB1; opcode <= 0xB1; opcode++) {
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printf("testing opcode: $%02X: ", opcode);
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memory[0xFFFC] = SETUP_ADDR & 0xFF;
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memory[0xFFFD] = SETUP_ADDR >> 8;
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uint16_t addr = SETUP_ADDR;
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memory[addr++] = 0xA2; /* LDA #S */
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memory[addr++] = 0x9A; /* TXS */
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memory[addr++] = 0x48; /* PHA */
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memory[addr++] = 0xA9; /* LDA #P */
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memory[addr++] = 0;
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memory[addr++] = 0x48; /* PHA */
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memory[addr++] = 0xA9; /* LHA #A */
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memory[addr++] = 0;
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memory[addr++] = 0xA2; /* LDX #X */
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memory[addr++] = 0;
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memory[addr++] = 0xA0; /* LDY #Y */
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memory[addr++] = 0;
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memory[addr++] = 0x28; /* PLP */
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memory[addr++] = 0x4C; /* JMP */
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memory[addr++] = INSTRUCTION_ADDR & 0xFF;
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memory[addr++] = INSTRUCTION_ADDR >> 8;
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memory[INSTRUCTION_ADDR + 0] = opcode;
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memory[INSTRUCTION_ADDR + 1] = 0;
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memory[INSTRUCTION_ADDR + 2] = 0;
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memory[INSTRUCTION_ADDR + 3] = 0;
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memory[0xFFFE] = BRK_VECTOR & 0xFF;
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memory[0xFFFF] = BRK_VECTOR >> 8;
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memory[BRK_VECTOR] = 0x00; /* loop there */
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initChip();
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/**************************************************
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* find out length of instruction in bytes
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**************************************************/
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setup_memory(opcode);
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initChip();
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int i;
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for (i = 0; i < MAX_CYCLES; i++) {
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step();
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@ -1122,6 +1150,7 @@ main()
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/**************************************************
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* find out length of instruction in cycles
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**************************************************/
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setup_memory(opcode);
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initChip();
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for (i = 0; i < MAX_CYCLES; i++) {
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step();
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@ -1131,8 +1160,15 @@ main()
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data[opcode].cycles = (cycle - 1) / 2;
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/**************************************************
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* find out reads
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* find out zp or abs reads
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**************************************************/
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setup_memory(opcode);
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memory[initial_x] = X_OFFSET;
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memory[initial_y] = Y_OFFSET;
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memory[MAGIC_8 + X_OFFSET + 0] = MAGIC_INDX & 0xFF;
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memory[MAGIC_8 + X_OFFSET + 1] = MAGIC_INDX >> 8;
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memory[MAGIC_8 + 0] = MAGIC_INDY & 0xFF;
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memory[MAGIC_8 + 1] = MAGIC_INDY >> 8;
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initChip();
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if (data[opcode].length == 2) {
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memory[INSTRUCTION_ADDR + 1] = MAGIC_8;
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@ -1141,19 +1177,70 @@ main()
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memory[INSTRUCTION_ADDR + 2] = MAGIC_16 >> 8;
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}
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data[opcode].zp = NO;
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data[opcode].abs = NO;
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data[opcode].zpx = NO;
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data[opcode].absx = NO;
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data[opcode].zpy = NO;
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data[opcode].absy = NO;
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data[opcode].indx = NO;
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data[opcode].indy = NO;
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data[opcode].reads = NO;
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data[opcode].writes = NO;
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for (i = 0; i < data[opcode].cycles * 2; i++) {
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step();
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if (IS_READ_CYCLE) {
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// printf("read: %04X\n", readAddressBus());
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if (IS_READ_CYCLE || IS_WRITE_CYCLE) {
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//printf("RW@ %X\n", readAddressBus());
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BOOL is_data_access = YES;
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if (readAddressBus() == MAGIC_8)
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data[opcode].zp = YES;
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else if (readAddressBus() == MAGIC_16)
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data[opcode].abs = YES;
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else if (readAddressBus() == MAGIC_8 + X_OFFSET)
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data[opcode].zpx = YES;
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else if (readAddressBus() == MAGIC_16 + X_OFFSET)
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data[opcode].absx = YES;
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else if (readAddressBus() == MAGIC_8 + Y_OFFSET)
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data[opcode].zpy = YES;
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else if (readAddressBus() == MAGIC_16 + Y_OFFSET)
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data[opcode].absy = YES;
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else if (readAddressBus() == MAGIC_INDX)
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data[opcode].indx = YES;
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else if (readAddressBus() == MAGIC_INDY + Y_OFFSET)
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data[opcode].indy = YES;
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else
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is_data_access = NO;
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if (is_data_access)
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if (IS_READ_CYCLE)
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data[opcode].reads = YES;
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if (IS_WRITE_CYCLE)
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data[opcode].writes = YES;
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}
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};
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// data[opcode].cycles = (cycle - 2) / 2;
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}
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if (data[opcode].crash) {
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printf("CRASH\n");
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} else {
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printf("bytes: %d ", data[opcode].length);
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printf("cycles: %d\n", data[opcode].cycles);
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printf("bytes: ");
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if (data[opcode].length < 0 || data[opcode].length > 9)
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printf("X ");
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else
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printf("%d ", data[opcode].length);
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printf("cycles: %d ", data[opcode].cycles);
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printf("zp: %d ", data[opcode].zp);
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printf("abs: %d ", data[opcode].abs);
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printf("zpx: %d ", data[opcode].zpx);
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printf("absx: %d ", data[opcode].absx);
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printf("zpy: %d ", data[opcode].zpy);
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printf("absy: %d ", data[opcode].absy);
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printf("indx: %d ", data[opcode].indx);
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printf("indy: %d ", data[opcode].indy);
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printf("r: %d ", data[opcode].reads);
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printf("w: %d ", data[opcode].writes);
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printf("\n");
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}
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}
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}
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