/*
 * Adds the constants 2 and 5 together. It then stores the sum to
 * memory address 0.
 *
 * Copyright(c) 2019-2021,2023 Jason Tang <jtang@umbc.edu>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

/* entry point into program */
	movi    R0, #2
	movi    R1, #5
	bl      R7, adder

	/* write result to memory address 0 */
	movi    R2, #0
	stwi    R0, R2, #0
	halt    0x1


/*
 * This function adds two values, then returns the sum. It is
 * equivalent to this C function:
 *    unsigned adder(unsigned a, unsigned b) {
 *        return a + b;
 *    }
 *
 * As a reminder, ULNAv2-B uses this calling convention:
 *   R0 - holds first function parameter, and holds return value
 *   R1 - holds second function parameter
 *   R7 - link register (holds return address)
 */
adder:
	add.    R0, R0, R1
	br      R7