Reg		Name		Notes
$16..$23		$s0..$s7		safe function variable; must not be overwritten by called subroutine
$24..$25		$t8..$t9		temporary; must be saved by caller to subroutine; subroutine can overwrite
$26..$27		$k0..$k1		for kernel use; may change unexpectedly
$28		$gp		global pointer
$29		$sp		stack pointer
$30		$fp		frame pointer
$31		$ra		return address of most recent caller