commit ca3c2f0f1666282ff9d4bb42d9bb935035f2d4ca
parent 87b9a3eb0c956a70efaff38862222f5b088285f7
Author: Martin Kloeckner <mjkloeckner@gmail.com>
Date: Sun, 12 Oct 2025 19:07:05 -0300
do not exit if file `6502_functional_test.bin` not found
run cpu with all zeroes in memory anyway
Diffstat:
| M | main.c | | | 27 | ++++++++++++--------------- |
1 file changed, 12 insertions(+), 15 deletions(-)
diff --git a/main.c b/main.c
@@ -7,9 +7,7 @@
#include <stdlib.h>
#include <stdbool.h>
#include <signal.h>
-
#include <unistd.h>
-
#include <time.h>
#define usleep(t) do { \
@@ -21,20 +19,23 @@
/* TODO: Add support for command line arguments */
/* TODO: Add proper system monitor (memory dump, cpu registers) */
+/* TODO: Tick based execution to properly emulate clock cycles */
+/* TODO: Move `CPU_dump` to tui */
static bool brk = false;
uint32_t t_us_delay = 50000;
void CPU_brk(uint16_t pc) {
- if (CPU_get_pc () == pc) {
+ if (CPU_get_pc() == pc) {
printf("BRK: %2X reached\n", pc);
brk = true;
}
}
void sig_handler(int signo) {
- if (signo == SIGINT) brk = true;
- if (signo == SIGQUIT) brk = true;
+ if ((signo == SIGINT) || (signo == SIGQUIT)) {
+ brk = true;
+ }
}
int main(void) {
@@ -44,8 +45,7 @@ int main(void) {
MEM_init();
/* Load program to memory */
- if(MEM_load_from_file(INPUT_FILE_PATH))
- return 1;
+ MEM_load_from_file(INPUT_FILE_PATH);
/* set the first address that the pc should be set to */
MEM_set_pc_start(0x0400);
@@ -62,18 +62,15 @@ int main(void) {
atexit(reset_input_mode);
do {
- /* set break point at pc 0x336d */
+ /* check if breakpoint reached */
CPU_brk(0x336d);
- CPU_fetch(&ins);
+ /* update tui */
CPU_dump();
- if(CPU_exec(ins) != 0) {
- /* exit if invalid instruction */
- char c;
- read(STDIN_FILENO, &c, 1);
- brk = true;
- }
+ /* fetch execute instruction */
+ CPU_fetch(&ins);
+ CPU_exec(ins);
usleep(t_us_delay);
} while(!brk);
