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fix(cpu): add key register and font address bounds checks

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This commit is contained in:
Stevan Freeborn
2026-07-18 15:15:55 -05:00
parent 30abd7a2bf
commit d975c16ed7
1 changed files with 3 additions and 3 deletions
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main.c
+3 -3
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@@ -389,11 +389,11 @@ int main(int argc, char *argv[]) {
break; break;
case 57344: // E000 case 57344: // E000
if (nn == 158) { if (nn == 158) {
if (chip->keys[chip->V[x]] == 1) { if (chip->keys[chip->V[x] & 0x0F] == 1) {
chip->pc += 2; chip->pc += 2;
} }
} else if (nn == 161) { } else if (nn == 161) {
if (chip->keys[chip->V[x]] != 1) { if (chip->keys[chip->V[x] & 0x0F] != 1) {
chip->pc += 2; chip->pc += 2;
} }
} }
@@ -411,7 +411,7 @@ int main(int argc, char *argv[]) {
} else if (nn == 30) { } else if (nn == 30) {
chip->I += chip->V[x]; chip->I += chip->V[x];
} else if (nn == 41) { } else if (nn == 41) {
chip->I = FONT_START + (chip->V[x] * 5); chip->I = FONT_START + ((chip->V[x] & 0x0F) * 5);
} else if (nn == 51) { } else if (nn == 51) {
chip->memory[chip->I] = chip->V[x] / 100; chip->memory[chip->I] = chip->V[x] / 100;
chip->memory[chip->I + 1] = (chip->V[x] / 10) % 10; chip->memory[chip->I + 1] = (chip->V[x] / 10) % 10;