360 Assembly/360 Instructions

There are several types of instructions on the 360 mainframe. The instruction type is determined by the first two bits of the op code. The instruction types are

• RR Instructions which use 2 registers for the arguments. These are two bytes long. RR instructions are op codes where the two high bits of the op code are 00, e.g. instructions 00-3F.
• RX Instructions which use one register and combined register and address as a base-displacement address. These are 4 bytes long. RX instructions are op codes where the two high bits of the op code are 01, e.g. instructions 40-7F.
• RS Instructions which use one register and combined register and address as a base-displacement address to reference a single string. These are 4 bytes long. RS instructions are op codes where the two high bits of the op code are 10, e.g. instructions 80-BF.
• SS Instructions which use two combined register and address values as base-displacement addresses to reference two strings. These are also 6 bytes long. SS instructions are op codes where the two high bits of the op code are 11, e.g. instructions CF-FF.

All instructions must be aligned to an even address. Attempts to create an instruction at an odd address will be flagged as an error by the assembler; an attempt to branch to an odd address will result in a program check.

There are three classes of instructions. 360 instructions are those which were part of the original IBM 360 mainframe instruction set, they are shown on the table below in this color: [       ]. 370 instructions were added with the creation of the IBM 370, they are shown on the table below in this color: [       ] are only available on 370 and higher series machines, and will cause a program check if they are attempted to be executed on a 360. z/System instructions were created after the 370, they are shown on the table below in this color: [       ] and will not work on 360 or 370 hardware, only on z/System machines.

In general, there are seven types of instructions:

• Branch Instructions, which jump from one part of a program to another
• Data Transfer Instructions, which move data from one part of memory
• Control Flow Instructions, which make changes in the scope of execution of a program
• Arithmetic Instructions, which do computations
• Logic Instructions, which make comparisons
• Shift and Rotate Instructions, which move bits right or left, and
• Other Instructions, instructions not otherwise classified, including privileged instructions

The table shown below can be sorted on any of its columns by clicking on the symbol at the top of that column.

Opcode (Hex)	Mnemonic	Description	Type of Instruction	Class of Instruction
0101	PR	Program Return	RR
0102	UPT	Update Tree	RR
0107	SCKPF	Set Clock Programmable Field	RR
010B	TAM	Test Addressing Mode	RR
010C	SAM24	Set Addressing Mode (to 24 bits)	RR
010D	SAM31	Set Addressing Mode (to 31 bits)	RR
010E	SAM64	Set Addressing Mode (to 64 bits)	RR
01FF	TRAP2	Trap	RR
04	SPM	Set Program Mask	RR	Other Instructions
05	BALR	Branch And Load Register	RR	Branch Instructions
06	BCTR	Branch on CounT Register	RR	Branch Instructions
07	BCR	Branch on Condition Register	RR	Branch Instructions
070	NOPR	No Operation Register	RR	Branch Instructions
07F	BR	Branch Register (Unconditional)	RR	Branch Instructions
08	SSK	Set Storage Key	RR	360 Only Other Instructions
09	ISK	Insert Storage Key	RR	360 Only Other Instructions
0A	SVC	SuperVisor Call	Immediate	Control Flow Instructions
0B	BSM	Branch and Set Mode	RR
0C	BASSM	Branch and Save and Set Mode	RR
0D	BASR	Branch And Store Register	RR	Branch Instructions
0E	MVCL	MoVe Character Long	RR
0F	CLCL	Compare Logical Character Long	RR
10	LPR	Load Positive	RR	Data Transfer Instructions
11	LNR	Load Negative	RR	Data Transfer Instructions
12	LTR	Load and Test Register	RR	Data Transfer Instructions
13	LCR	Load and Compare Register	RR	Data Transfer Instructions
14	NR	aNd Register	RR	Data Transfer Instructions
15	CLR	Compare Logical Register	RR	Logic Instructions
16	OR	Or Register	RR	Data Transfer Instructions
17	XR	eXclusive-or Register	RR	Data Transfer Instructions
18	LR	Load Register	RR	Data Transfer Instructions
19	CR	Compare Register	RR	Logic Instructions
1A	AR	Add Register	RR	Arithmetic Instructions
1B	SR	Subtract Register	RR	Arithmetic Instructions
1C	MR	Multiply Register	RR	Arithmetic Instructions
1D	DR	Divide Register	RR	Arithmetic Instructions
1E	ALR	Add Logical Register	RR	Arithmetic Instructions
1F	SLR	Subtract Logical Register	RR	Arithmetic Instructions
20	LPDR	Load Positive	RR	Data Transfer Instructions
21	LNDR	Load Negative	RR	Data Transfer Instructions
22	LTDR	Load and Test	RR	Data Transfer Instructions
23	LCDR	Load Complement	RR	Data Transfer Instructions
24	HDR	Halve	RR	Arithmetic Instructions
25	LDXR	Load Double eXt. Rounded	RR
25	LRDR	Load Rounded	RR	360 Only
26	MXR	Multiply	RR	Arithmetic Instructions
27	MXDR	Multiply	RR	Arithmetic Instructions
28	LDR	Load	RR	Data Transfer Instructions
29	CDR	Compare Double Reg.	RR	Data Transfer Instructions
2A	ADR	Add Double Register	RR	Arithmetic Instructions
2B	SDR	Subtract Double Reg.	RR	Arithmetic Instructions
2C	MDR	Multiply Double Reg.	RR	Arithmetic Instructions
2D	DDR	Divide Double Reg.	RR	Arithmetic Instructions
2E	AWR	Add Unnormalized	RR	Arithmetic Instructions
2F	SWR	Subtract Unnormalized	RR	Arithmetic Instructions
30	LPER	Load Positive	RR	Data Transfer Instructions
31	LNER	Load Negative	RR	Data Transfer Instructions
32	LTER	Load and Test	RR	Data Transfer Instructions
33	LCER	Load Complement	RR	Data Transfer Instructions
34	HER	Halve	RR	Arithmetic Instructions
35	LEDR		RR
35	LRER	Load Rounded	RR	Data Transfer Instructions
36	AXR	Add Normalized	RR	Arithmetic Instructions
37	SXR	Subtract Normalized	RR	Arithmetic Instructions
38	LER	Load	RR	Data Transfer Instructions
39	CER	Compare	RR	Logic Instructions
3A	AER	Add Normalized	RR	Arithmetic Instructions
3B	SER	Subtract Normalized	RR	Arithmetic Instructions
3C	MER	Multiply Normalized	RR	Arithmetic Instructions
3C	MDER		RR	Arithmetic Instructions
3D	DER	Divide Normalized	RR	Arithmetic Instructions
3E	AUR	Add Unnormalized	RR	Arithmetic Instructions
3F	SUR	Subtract Unnormalized	RR	Arithmetic Instructions
40	STH	STore Halfword	RX	Data Transfer Instructions
41	LA	Load Address	RX	Data Transfer Instructions
42	STC	STore Character	RX	Data Transfer Instructions
43	IC	Insert Character	RX	Data Transfer Instructions
44	EX	EXecute	RX	Data Transfer Instructions
45	BAL	Branch And Link	RX	Branch Instructions
46	BCT	Branch on CounT	RX	Branch Instructions
47	BC	Branch on Condition	RX	Branch Instructions
470	NOP	No Operation	RX	Branch Instructions
471	BO	Branch on Overflow/Ones	RX	Branch Instructions
472	BH	Branch (a High)	RX	Branch Instructions
472	BP	Branch on Plus	RX	Branch Instructions
474	BL	Branch (a Low)	RX	Branch Instructions
474	BM	Branch on Minus/Mixed	RX	Branch Instructions
477	BNE	Branch Not Equal	RX	Branch Instructions
477	BNZ	Branch Not Zero	RX	Branch Instructions
478	BE	Branch (a Equal b)	RX	Branch Instructions
478	BZ	Branch on Zero	RX	Branch Instructions
47B	BNL	Branch (a Not Low)	RX	Branch Instructions
47B	BNM	Branch Not Minus	RX	Branch Instructions
47D	BNH	Branch Not High	RX	Branch Instructions
47D	BNP	Branch Not Plus	RX	Branch Instructions
47E	BNO	Branch Not Ones	RX	Branch Instructions
47F	B	Branch (unconditional)	RX	Branch Instructions
48	LH	Load Halfword	RX	Data Transfer Instructions
49	CH	Compare Halfword	RX	Logic Instructions
4A	AH	Add Halfword	RX	Arithmetic Instructions
4B	SH	Subtract Halfword	RX	Arithmetic Instructions
4C	MH	Multiply Halfword	RX	Arithmetic Instructions
4D	BAS	Branch And Store	RX	Branch Instructions
4E	CVD	ConVert to Decimal	RX	Data Transfer Instructions
4F	CVB	ConVert to Binary	RX	Data Transfer Instructions
50	ST	STore	RX	Data Transfer Instructions
51	LAE
54	N	aNd	RX	Data Transfer Instructions
55	CL	Compare Logical	RX	Logic Instructions
56	O	Or	RX	Data Transfer Instructions
57	X	eXclusive or	RX	Data Transfer Instructions
58	L	Load	RX	Data Transfer Instructions
59	C	Compare	RX	Logic Instructions
5A	A	Add	RX	Arithmetic Instructions
5B	S	Subtract	RX	Arithmetic Instructions
5C	M	Multiply	RX	Arithmetic Instructions
5D	D	Divide	RX	Arithmetic Instructions
5E	AL	Add Logical	RX	Arithmetic Instructions
5F	SL	Subtract Logical	RX	Arithmetic Instructions
60	STD	Store Double	RX	Data Transfer Instructions
67	MXD	Multiply Double	RX	Arithmetic Instructions
68	LD	Load Double	RX	Data Transfer Instructions
69	CD	Compare Double	RX	Logic Instructions
6A	AD	Add Double	RX	Arithmetic Instructions
6B	SD	Subtract Double	RX	Arithmetic Instructions
6C	MD	Multiply Double	RX	Arithmetic Instructions
6D	DD	Divide Double	RX	Arithmetic Instructions
6E	AW	Add unnormalized (Word)	RX	Arithmetic Instructions
6F	SW	Subtract unnormalized (Word)	RX	Arithmetic Instructions
70	STE	Store short	RX	Data Transfer Instructions
71	MS		RX
78	LE	Load short	RX	Data Transfer Instructions
79	CE	Compare short	RX	Logic Instructions
7A	AE	Add normalized short	RX	Arithmetic Instructions
7B	SE	Subtract normalized short	RX	Arithmetic Instructions
7C	ME	Multiply short	RX	Arithmetic Instructions
7C	MDE		RX
7D	DE	Divide short	RX	Arithmetic Instructions
7E	AU	Add Unnormalized short	RX	Arithmetic Instructions
7F	SU	Subtract Unnormalized short	RX	Arithmetic Instructions
80	SSM	Set System Mask	RX	Other Instructions
82	LPSW	Load Program Status Word	RX	Data Transfer Instructions
83	Diagnose	Diagnose	RX	Other Instructions
84	WRD	Write Direct	RX	360 Only Other Instructions
84	BRXH	Branch Register on indeX High
85	RDD	Read Direct	RX	360 Only Other Instructions
85	BRXLE	Branch Register on indeX Low or Equal
86	BXH	Branch on indeX High	RS	Branch Instructions
87	BXLE	Branch on indeX Low or Equal	RS	Branch Instructions
88	SRL	Shift Right Logical	RX	Shift and Rotate Instructions
89	SLL	Shift Left Logical	RX	Shift and Rotate Instructions
8A	SRA	Shift Right Arithmetic	RX	Shift and Rotate Instructions
8B	SLA	Shift Left Arithmetic	RX	Shift and Rotate Instructions
8C	SRDL	Shift Right Double Logical	RX	Arithmetic Instructions
8D	SLDL	Shift Left Double Logical	RX	Arithmetic Instructions
8E	SRDA	Shift Right Double Arithmetic	RX	Shift and Rotate Instructions
8F	SLDA	Shift Left Double Arithmetic	RX	Shift and Rotate Instructions
90	STM	STore Multiple	RX	Data Transfer Instructions
91	TM	Test under Mask	RX	Logic Instructions
92	MVI	MoVe Immediate	RX	Data Transfer Instructions
93	TS	Test and Set	RX	Logic Instructions
94	NI	aNd Immediate	RX	Data Transfer Instructions
95	CLI	Compare Logical Immediate	RX	Logic Instructions
96	OI	Or Immediate	RX	Arithmetic Instructions
97	XI	eXclusive-or Immediate	RX	Data Transfer Instructions
98	LM	Load Multiple	RS	Data Transfer Instructions
99	TRACE
9A	LAM
9B	STAM
9D	TIO	Test I/O	SI	Other Instructions
9F	TCH	Test CHannel	SI	Other Instructions
A50	IIHH
A51	IIHL
A52	IILH
A53	IILL
A54	NIHH
A55	NIHL
A56	NILH
A57	NILL
A58	OIHH
A59	OIHL
A5A	OILH
A5B	OILL
A5C	LLIHH
A5D	LLIHL
A5E	LLILH
A5F	LLILL
A70	TMLH
A70	TMH
A71	TMLL
A71	TML
A72	TMHH
A73	TMHL
A74	BRC
A75	BRAS
A76	BRCT
A77	BRCTG
A78	LHI
A79	LGHI
A7A	AHI
A7B	AGHI
A7C	MHI
A7D	MGHI
A7E	CHI
A7F	CGHI
A8	MVCLE
A9	CLCLE
AC	STNSM
AD	STOSM
AE	SIGP
AF	MC
B1	LRA
B202	STIDP
B204	SCK
B205	STCK
B206	SCKC
B207	STCKC
B208	SPT
B209	STPT
B20A	SPKA
B20B	IPK
B20D	PTLB
B210	SPX
B211	STPX
B212	STAP
B214	SIE
B218	PC
B219	SAC
B21A	CFC
B221	IPTE
B222	IPM
B223	IVSK
B224	IAC
B225	SSAR
B226	EPAR
B227	ESAR
B228	PT
B229	ISKE
B22A	RRBE
B22B	SSKE
B22C	TB
B22D	DXR
B22E	PGIN
B22F	PGOUT
B230	CSCH
B231	HSCH
B232	MSCH
B233	SSCH
B234	STSCH
B235	TSCH
B236	TPI
B237	SAL
B238	RSCH
B239	STCRW
B23A	STCPS
B23B	RCHP
B23C	SCHM
B240	BAKR
B241	CKSM
B244	SQDR
B245	SQER
B246	STURA
B247	MSTA
B248	PALB
B249	EREG
B24A	ESTA
B24B	LURA
B24C	TAR
B24D	CPYA
B24E	SAR
B24F	EAR
B250	CSP
B252	MSR
B254	MVPG
B255	MVST
B257	CUSE
B258	BSG
B25A	BSA
B25D	CLST
B25E	SRST
B263	CMPSC
B276	XSCH
B277	RP
B278	STCKE
B279	SACF
B27D	STSI
B299	SRNM
B29C	STFPC
B29D	LFPC
B2A5	TRE
B2A6	CUUTF
B2A7	CUTFU
B2B1	STFL
B2B2	LPSWE
B2FF	TRAP4
B300	LPEBR
B301	LNEBR
B302	LTEBR
B303	LCEBR
B304	LDEBR
B305	LXDBR
B306	LXEBR
B307	MXDBR
B308	KEBR
B309	CEBR
B30A	AEBR
B30B	SEBR
B30C	MDEBR
B30D	DEBR
B30E	MAEBR
B30F	MSEBR
B310	LPDBR
B311	LNDBR
B312	LTDBR
B313	LCDBR
B314	SQEBR
B315	SQDBR
B316	SQXBR
B317	MEEBR
B318	KDBR
B319	CDBR
B31A	ADBR
B31B	SDBR
B31C	MDBR
B31D	DDBR
B31E	MADBR
B31F	MSDBR
B324	LDER
B325	LXDR
B326	LXER
B336	SQXR
B337	MEER
B340	LPXBR
B341	LNXBR
B342	LTXBR
B343	LCXBR
B344	LEDBR
B345	LDXBR
B346	LEXBR
B347	FIXBR
B348	KXBR
B349	CXBR
B34A	AXBR
B34B	SXBR
B34C	MXBR
B34D	DXBR
B350	TBEDR
B351	TBDR
B353	DIEBR
B357	FIEBR
B358	THDER
B359	THDR
B35B	DIDBR
B35F	FIDBR
B360	LPXR
B361	LNXR
B362	LTXR
B363	LCXR
B365	LXR
B366	LEXR
B367	FIXR
B369	CXR
B374	LZER
B375	LZDR
B376	LZXR
B377	FIER
B37F	FIDR
B384	SFPC
B38C	EFPC
B394	CEFBR
B395	CDFBR
B396	CXFBR
B398	CFEBR
B399	CFDBR
B39A	CFXBR
B3A4	CEGBR
B3A5	CDGBR
B3A6	CXGBR
B3A8	CGEBR
B3A9	CGDBR
B3AA	CGXBR
B3B4	CEFR
B3B5	CDFR
B3B6	CXFR
B3B8	CFER
B3B9	CFDR
B3BA	CFXR
B3C4	CEGR
B3C5	CDGR
B3C6	CXGR
B3C8	CGER
B3C9	CGDR
B3CA	CGXR
B6	STCTL
B7	LCTL
B8	LMC	Load Multiple Control	RS	P Other Instructions
B900	LPGR
B901	LNGR
B902	LTGR
B903	LCGR
B904	LGR
B905	LURAG
B908	AGR
B909	SGR
B90A	ALGR
B90B	SLGR
B90C	MSGR
B90D	DSGR
B90E	EREGG
B90F	LRVGR
B910	LPGFR
B911	LNGFR
B912	LTGFR
B913	LCGFR
B914	LLGFR
B916	LCGR
B917	LLGTR
B918	AGFR
B919	SGFR
B91A	ALGFR
B91B	SLGFR
B91C	MSGFR
B91D	DSGFR
B91F	LRVR
B920	CGR
B921	CLGR
B925	STURG
B930	CGFR
B931	CLGFR
B946	BCTGR
B980	NGR
B981	OGR
B982	XGR
B986	MLGR
B987	DLGR
B988	ALCGR
B989	SLBGR
B98D	EPSW
B990	TRTT
B991	TRTO
B992	TROT
B993	TROO
B996	MLR
B997	DLR
B998	ALCR
B999	SLBR
B99D	ESEA
BA	CS
BB	CDS
BD	CLM
BE	STCM	Store Characters under Mask
BF	ICM	Insert Characters under Mask
C00	LARL
C04	BRCL
C05	BRASL
D1	MVN	MoVe Numerio	SS	Data Transfer Instructions
D2	MVC	MoVe Character	SS	Data Transfer Instructions
D2	MVZ	MoVe Zoned	SS	Data Transfer Instructions
D4	NC	aNd Character	SS	Data Transfer Instructions
D5	CLC	Compare Logical Character	SS	Logic Instructions
D6	OC	Or Character	SS	Data Transfer Instructions
D7	XC	eXclusive-or Character	SS	Data Transfer Instructions
D9	MVCK
DA	MVCP
DB	MVCS
DC	TR	TRanslate	SS	Data Transfer Instructions
DD	TRT	TRanslate and Test	SS	Data Transfer Instructions
DE	ED	EDit	SS	Data Transfer Instructions
DF	EDMK	EDit and MarK	SS	Data Transfer Instructions
E1	PKU
E2	UNPKU
E303	LRAG
E304	LG
E308	AG
E309	SG
E30A	ALG
E30B	SLG
E30C	MSG
E30D	DSG
E30E	CVBG
E30F	LRVG
E314	LGF
E315	LGH
E316	LLGF
E317	LLGT
E318	AGF
E319	SGF
E31A	ALGF
E31B	SLGF
E31C	MSGF
E31D	DSGF
E31E	LRV
E31F	LRVH
E320	CG
E321	CLG
E324	STG
E32E	CVDG
E32F	STRVG
E330	CGF
E331	CLGF
E33E	STRV
E33F	STRVH
E346	BCTG
E380	NG
E381	OG
E382	XG
E386	MLG
E387	DLG
E388	ALCG
E389	SLBG
E38E	STPQ
E38F	LPQ
E390	LLGC
E391	LLGH
E396	ML
E397	DL
E398	ALC
E399	SLB
E500	LASP
E501	TPROT
E502	STRAG
E50E	MVCSK
E50F	MVCDK
E8	MVCIN
E9	PKA
EA	UNPKA
EB04	LMG
EB0A	SRAG
EB0B	SLAG
EB0C	SRLG
EB0D	SLLG
EB0F	TRACG
EB1C	RLLG
EB1D	RLL
EB20	CLMH
EB24	STMG
EB25	STCTG
EB26	STMH
EB2C	STCMH
EB2F	LCTLG
EB30	CSG
EB3E	CDSG
EB44	BXHG
EB45	BXLEG
EB80	ICMH
EB8E	MVCLU
EB8F	CLCLU
EB96	LMH
EBC0	TP
EC44	BRXHG
EC45	BRXLG
ED04	LDEB
ED05	LXDB
ED06	LXEB
ED07	MXDB
ED08	KEB
ED09	CEB
ED0A	AEB
ED0B	SEB
ED0C	MDEB
ED0D	DEB
ED0E	MAEB
ED0F	MSEB
ED10	TCEB
ED11	TCDB
ED12	TCXB
ED14	SQEB
ED15	SQDB
ED17	MEEB
ED18	KDB
ED19	CDB
ED1A	ADB
ED1B	SDB
ED1C	MDB
ED1D	DDB
ED1E	MADB
ED1F	MSDB
ED24	LDE
ED25	LXD
ED26	LXE
ED34	SQE
ED35	SQD
ED37	MEE
EE	PLO
EF	LMD
F0	SRP	Shift and Round Packed	SS	Arithmetic Instruction
F1	MVO	Move with Offset	SS	Arithmetic Instruction
F2	PACK	PACK	SS	Arithmetic Instruction
F3	UNPK	UNPacK	SS	Arithmetic Instruction
F8	ZAP	Zero and Add Packed	SS	Arithmetic Instruction
F9	CP	Compare Packed	SS	Arithmetic Instruction
FA	AP	Add Packed	SS	Arithmetic Instruction
FB	SP	Subtract Packed	SS	Arithmetic Instruction
FC	MP	Multiply Packed	SS	Arithmetic Instruction
FD	DP	Divide Packed	SS	Arithmetic Instruction