80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
#include "utils.h"
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namespace emu_6502 {
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string uint_to_hex(uint64_t value) {
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stringstream ss;
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ss << hex << value;
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return ss.str();
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}
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void set_zero_and_neg_flags(StatusRegister& ps, uint8_t value) {
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ps.set_zero(value == 0);
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ps.set_negative((value & 0x80) == 0x80);
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}
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uint8_t get_zpg_address(Machine& machine) {
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return machine.read_program_byte();
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}
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uint8_t get_zpg_x_address(Machine& machine) {
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// expect wrap around
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return machine.read_program_byte() + machine.get_cpu().get_x().get_value();
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}
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uint8_t get_zpg_y_address(Machine& machine) {
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// expect wrap around
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return machine.read_program_byte() + machine.get_cpu().get_y().get_value();
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}
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uint16_t get_abs_address(Machine& machine) {
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auto low_byte = machine.read_program_byte();
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auto high_byte = machine.read_program_byte();
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uint16_t address = (high_byte << 8) + low_byte;
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return address;
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}
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uint16_t get_abs_x_address(Machine& machine) {
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auto low_byte = machine.read_program_byte();
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auto high_byte = machine.read_program_byte();
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uint16_t address = (high_byte << 8) + low_byte + machine.get_cpu().get_x().get_value();
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return address;
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}
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uint16_t get_abs_y_address(Machine& machine) {
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auto low_byte = machine.read_program_byte();
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auto high_byte = machine.read_program_byte();
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uint16_t address = (high_byte << 8) + low_byte + machine.get_cpu().get_y().get_value();
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return address;
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}
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uint16_t get_ind_address(Machine& machine) {
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auto low_byte = machine.read_program_byte();
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auto high_byte = machine.read_program_byte();
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uint16_t paddress = (high_byte << 8) + low_byte;
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auto low = machine.get_memory().get_at(paddress);
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auto high = machine.get_memory().get_at(paddress + 1);
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uint16_t address = (high << 8) + low;
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return address;
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}
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uint16_t get_ind_x_address(Machine& machine) {
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uint8_t paddress = machine.get_cpu().get_x().get_value() + machine.read_program_byte();
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auto low = machine.get_memory().get_at(paddress);
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auto high = machine.get_memory().get_at(paddress + 1);
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uint16_t address = (high << 8) + low;
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return address;
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}
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uint16_t get_ind_y_address(Machine& machine) {
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auto offset = machine.read_program_byte();
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auto low = machine.get_memory().get_at(offset);
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auto high = machine.get_memory().get_at(offset + 1);
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auto y = machine.get_cpu().get_y().get_value();
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uint16_t address = (high << 8) + low + y;
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return address;
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}
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} |