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Update chip8.c #1

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27 changes: 22 additions & 5 deletions chip8.c
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Original file line number Diff line number Diff line change
Expand Up @@ -67,12 +67,29 @@ int main(void)
// the chip 8 cpu starts here

// clear the stack, registers, graphics, memory
memset(graphics, 0, sizeof(graphics));
memset(stack, 0, sizeof(stack));
memset(V, 0, sizeof(V));
memset(memory, 0, sizeof(memory));
void secure_memzero(void *buf, size_t len) {
volatile unsigned char *p = buf;
while (len--) {
*p++ = 0;
}
}

// program counter starts at 0x200
int main() {
unsigned char stack[SIZE];
int V[SIZE];
char memory[SIZE];

// securely overwrite sensitive information in the buffers
secure_memzero(graphics, sizeof(graphics));
secure_memzero(stack, sizeof(stack));
secure_memzero(V, sizeof(V));
secure_memzero(memory, sizeof(memory));

// program counter starts at 0x200
// code continues...

return 0;
}
pc = 0x200;

// reset opcode
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