mirror of
https://github.com/rkujawa/rk65c02.git
synced 2026-03-11 03:16:11 +00:00
a73ebc3024
- interrupts: IRQ vector at $FFFE, vector device at $FFFC, idle_wait + assert_irq - hello_serial: custom bus device at $DE00, guest writes host prints - stepper: rk65c02_step(1) loop with regs and disassembly - jit_bench: min3.rom interpreter vs JIT wall time - breakpoints: debug_breakpoint_add at min3 entry, inspect then continue - README: document new examples, run from examples/ or make run-<name> - Makefile: EXAMPLES and run-* targets for all five Made-with: Cursor
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
|
|
* Stepper example — step-by-step execution and state inspection.
|
|
*
|
|
* Build: make stepper stepper.rom
|
|
* Run: ./stepper
|
|
*
|
|
* Demonstrates: rk65c02_step(e, 1) in a loop, reading regs and disassembling
|
|
* the current instruction after each step. Stops when not STEPPED or after
|
|
* a bounded number of steps.
|
|
* Expected: trace of PC and disassembly for each step, then STP; PASS.
|
|
*/
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
|
|
#include "bus.h"
|
|
#include "instruction.h"
|
|
#include "rk65c02.h"
|
|
|
|
static const uint16_t load_addr = 0xC000;
|
|
#define MAX_STEPS 25
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
rk65c02emu_t e;
|
|
uint16_t steps;
|
|
|
|
e = rk65c02_load_rom("stepper.rom", load_addr, NULL);
|
|
e.regs.SP = 0xFF;
|
|
e.regs.PC = load_addr;
|
|
|
|
printf("Stepping (max %d steps):\n", MAX_STEPS);
|
|
for (steps = 0; steps < MAX_STEPS; steps++) {
|
|
rk65c02_step(&e, 1);
|
|
printf(" step %u PC=$%04X A=$%02X X=$%02X Y=$%02X SP=$%02X ",
|
|
(unsigned)steps + 1, e.regs.PC, e.regs.A, e.regs.X, e.regs.Y, e.regs.SP);
|
|
disassemble(e.bus, e.regs.PC);
|
|
if (e.stopreason != STEPPED)
|
|
break;
|
|
}
|
|
|
|
printf("Stop reason: %s\n", rk65c02_stop_reason_string(e.stopreason));
|
|
if (e.stopreason != STP) {
|
|
fprintf(stderr, "FAIL: expected STP, got %s\n",
|
|
rk65c02_stop_reason_string(e.stopreason));
|
|
return 1;
|
|
}
|
|
printf("PASS: stepped to STP.\n");
|
|
return 0;
|
|
}
|