MIPS >> Opcode

MIPS III

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參考資訊：
1. mips-isa

opcode欄位對應如下：

bits 31 30 29 28 27 26	25 24 23 22 21	20 19 18 17 16	15 14 13 12 11 10 9 8 7 6	5 4 3 2 1 0
opcode

opcode	(bits 28..26) 000	001	010	011	100	101	110	111
(bits 31..29) 000	special	regimm	j	jal	beq	bne	blez	bgtz
001	addi	addiu	slti	sltiu	andi	ori	xori	lui
010	cop0	cop1	cop2		beql	bnel	blezl	bgtzl
011	daddi	daddiu	ldl	ldr
100	lb	lh	lwl	lw	lbu	lhu	lwr	lwu
101	sb	sh	swl	sw	sdl	sdr	swr
110	ll	lwc1	lwc2		lld	ldc1	ldc2	ld
111	sc	swc1	swc2		scd	sdc1	sdc2	sd

function欄位對應如下：

bits 31 30 29 28 27 26	25 24 23 22 21	20 19 18 17 16	15 14 13 12 11 10 9 8 7 6	5 4 3 2 1 0
opcode=special				function

function	(bits 2..0) 000	001	010	011	100	101	110	111
(bits 5..3) 000	sll		srl	sra	sllv		srlv	srav
001	jr	jalr			syscall	break		sync
010	mfhi	mthi	mflo	mtlo	dsllv		dsrlv	dsrav
011	mult	multu	div	divu	dmult	dmultu	ddiv	ddivu
100	add	addu	sub	subu	and	or	xor	nor
101			slt	sltu	dadd	daddu	dsub	dsubu
110	tge	tgeu	tlt	tltu	teq		tne
111	dsll		dsrl	dsra	dsll32		dsrl32	dsra32

rt欄位對應如下：

bits 31 30 29 28 27 26	25 24 23 22 21	20 19 18 17 16	15 14 13 12 11 10 9 8 7 6	5 4 3 2 1 0
opcode=regimm		rt

rt	(bits 18..16) 000	001	010	011	100	101	110	111
(bits 20..19) 00	bltz	bgez	bltzl	bgezl
01	tgei	tgeiu	tlti	tltiu	teqi		tnei
10	bltzal	bgezal	bltzall	bgezall
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