stack

cpu.c

/* --- Stack operations --- */
static void pushb(BYTE val) {
	Memory_WriteByte((STACK_ADDR | cpu.SP--), val);
}

static void pushw(WORD val) {
	BYTE tmp = (BYTE)(val & 0xFF);
	Memory_WriteByte((STACK_ADDR | cpu.SP--), tmp);
	tmp = (BYTE)((val & 0xFF00) >> 8);
	Memory_WriteByte((STACK_ADDR | cpu.SP--), tmp);
}

static BYTE pullb() {
	return Memory_ReadByte((STACK_ADDR | ++cpu.SP));
}

static WORD pullw() {
	WORD tmp = (WORD)Memory_ReadByte((STACK_ADDR | ++cpu.SP));
	return tmp & (WORD)(Memory_ReadByte((STACK_ADDR | ++cpu.SP)) << 8);
}