mirror of
https://github.com/rkujawa/rk65c02.git
synced 2024-06-01 05:41:27 +00:00
75 lines
1.2 KiB
C
75 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <string.h>
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#include "bus.h"
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#include "instruction.h"
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#include "rk65c02.h"
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rk65c02emu_t
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rk65c02_init(bus_t *b)
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{
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rk65c02emu_t e;
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e.bus = b;
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e.state = STOPPED;
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e.regs.P = P_UNDEFINED;
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return e;
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}
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void
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rk65c02_start(rk65c02emu_t *e) {
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instruction_t i;
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instrdef_t id;
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e->state = RUNNING;
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while (e->state == RUNNING) {
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/* XXX: handle breakpoints and watch points */
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/* if disassembly-when-running enabled */
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disassemble(e->bus, e->regs.PC);
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i = instruction_fetch(e->bus, e->regs.PC);
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id = instruction_decode(i.opcode);
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if (id.emul != NULL) {
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id.emul(e, &id, &i);
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/* if (!instruction_modify_pc) */
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program_counter_increment(e, &id);
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} else {
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printf("unimplemented opcode %X @ %X\n", i.opcode,
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e->regs.PC);
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e->state = STOPPED;
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}
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}
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}
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/*
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int
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main(void)
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{
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bus_t b;
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b = bus_init();
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bus_write_1(&b, 0, OP_INX);
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bus_write_1(&b, 1, OP_NOP);
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bus_write_1(&b, 2, OP_LDY_IMM);
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bus_write_1(&b, 3, 0x1);
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bus_write_1(&b, 4, OP_TSB_ZP);
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bus_write_1(&b, 5, 0x3);
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bus_write_1(&b, 6, OP_JSR);
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bus_write_1(&b, 7, 0x09);
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bus_write_1(&b, 8, 0x0);
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bus_write_1(&b, 9, OP_STP);
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rk6502_start(&b, 0);
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bus_finish(&b);
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}
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*/
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