43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
#include "stack-opcode-handler.h"
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#include <sstream>
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#include <climits>
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const uint8_t StackOpcodeHandler::PHA;
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const uint8_t StackOpcodeHandler::PLA;
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const uint8_t StackOpcodeHandler::PHP;
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const uint8_t StackOpcodeHandler::PLP;
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void StackOpcodeHandler::execute() {
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auto instructionIndex = reg_man->get_program_counter()->get_value();
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auto opcode = program->get_byte_at(instructionIndex);
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switch (opcode) {
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case PHA:
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memory->stack_push(reg_man->get_accumulator()->get_value());
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break;
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case PLA:
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reg_man->get_accumulator()->set_value(memory->stack_pop());
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break;
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case PHP: {
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ulong long_data = reg_man->get_status_register()->get_value().to_ulong();
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auto data = static_cast<uint8_t>(long_data);
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memory->stack_push(data);
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break;
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}
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case PLP: {
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auto data = memory->stack_pop();
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reg_man->get_status_register()->set_value(bitset<8>(data));
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break;
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}
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default:
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stringstream stream;
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stream << "Unexpected opcode 0x" << hex << opcode;
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throw runtime_error(stream.str());
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}
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move_program_counter(1);
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} |