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Added -c flag to run for specified number of cycles and exit

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Rob McMullen 2017-12-18 09:52:11 -08:00
parent c5e9cf084e
commit 1e52aaa154
1 changed files with 11 additions and 4 deletions
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15
6502-emu.c
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@ -19,7 +19,7 @@ void step_delay()
nanosleep(&req, &rem); nanosleep(&req, &rem);
} }
void run_cpu(int verbose, int mem_dump) void run_cpu(int cycle_stop, int verbose, int mem_dump)
{ {
int cycles = 0; int cycles = 0;
int cycles_per_step = (CPU_FREQ / (ONE_SECOND / STEP_DURATION)); int cycles_per_step = (CPU_FREQ / (ONE_SECOND / STEP_DURATION));
@ -28,10 +28,13 @@ void run_cpu(int verbose, int mem_dump)
for (cycles %= cycles_per_step; cycles < cycles_per_step;) { for (cycles %= cycles_per_step; cycles < cycles_per_step;) {
if (mem_dump) save_memory(NULL); if (mem_dump) save_memory(NULL);
cycles += step_cpu(verbose); cycles += step_cpu(verbose);
if ((cycle_stop > 0) && (cycles >= cycle_stop)) goto end;
step_uart(); step_uart();
} }
step_delay(); // remove this for more speed step_delay(); // remove this for more speed
} }
end:
return;
} }
void restore_stdin() void restore_stdin()
@ -61,19 +64,20 @@ int hextoint(char *str) {
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
int a, x, y, sp, sr, pc; int a, x, y, sp, sr, pc;
int verbose, interactive, mem_dump; int verbose, interactive, mem_dump, cycles;
int opt; int opt;
verbose = 0; verbose = 0;
interactive = 0; interactive = 0;
mem_dump = 0; mem_dump = 0;
cycles = 0;
a = 0; a = 0;
x = 0; x = 0;
y = 0; y = 0;
sp = 0; sp = 0;
sr = 0; sr = 0;
pc = -RST_VEC; // negative implies indirect pc = -RST_VEC; // negative implies indirect
while ((opt = getopt(argc, argv, "vima:x:y:r:p:s:g:")) != -1) { while ((opt = getopt(argc, argv, "vima:x:y:r:p:s:g:c:")) != -1) {
switch (opt) { switch (opt) {
case 'v': case 'v':
verbose = 1; verbose = 1;
@ -103,6 +107,9 @@ int main(int argc, char *argv[])
case 'g': case 'g':
pc = hextoint(optarg); pc = hextoint(optarg);
break; break;
case 'c':
cycles = atoi(optarg);
break;
default: /* '?' */ default: /* '?' */
fprintf(stderr, "Usage: %s [-v] [-i] [-a HEX] [-x HEX] [-y HEX] [-s HEX] [-p HEX] [-g|-r ADDR] file.rom\nThe first 16k of \"file.rom\" is loaded into the last 16k of memory.\n", fprintf(stderr, "Usage: %s [-v] [-i] [-a HEX] [-x HEX] [-y HEX] [-s HEX] [-p HEX] [-g|-r ADDR] file.rom\nThe first 16k of \"file.rom\" is loaded into the last 16k of memory.\n",
argv[0]); argv[0]);
@ -125,7 +132,7 @@ int main(int argc, char *argv[])
init_uart(); init_uart();
reset_cpu(a, x, y, sp, sr, pc); reset_cpu(a, x, y, sp, sr, pc);
run_cpu(verbose, mem_dump); run_cpu(cycles, verbose, mem_dump);
return EXIT_SUCCESS; return EXIT_SUCCESS;
} }