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S/360

[edit]
IBM S/360 PSW formats
S/360 Standard PSW[1]

System Mask Key A M W P Interruption Code
0 7 8 11 12 13 14 15 16 31

ILC CC Program
Mask 		Instruction Address
32 33 34 35 36 39 40 63
S/360 Standard PSW abbreviations
Bits Field Meaning
0-7 SM
System Mask
Bit Meaning
0 Channel 0 mask
1 Channel 1 mask
2 Channel 2 mask
3 Channel 3 mask
4 Channel 4 mask
5 Channel 5 mask
6 Channel 6 mask
7 External Mask
8-11 Key PSW key
12 A ASCII
13 M Machine-check mask
14 W Wait state
15 P Problem state
16-31 IC Interruption Code[2]
32-33 ILC Instruction-Length Code[3]
34-35 CC Condition Code
36-39 PM
Program Mask
Bit Meaning
36 Fixed-point overflow
37 Decimal overflow
38 Exponent underflow
39 Significance
40-63 IA Instruction Address
S/360 Extended PSW[4]

spare 24/32
Bit
Mode 		T I
O 		E
X 		Key A M W P ILC CC Program
Mask 		spare
0 3 4 5 6 7 8 11 12 13 14 15 16 17 18 19 20 23 24 31

Instruction Address
32 63
S/360 Extended PSW abbreviations
Bits Field Meaning
0-3 Spare (must be 0)
4 24/32-bit Address mode
5 T Translation Control
6 IO I/O Mask (Summary)
7 EX External Mask (Summary)
8-11 Key Protection Key
12 A ASCII
13 M Machine-check mask
14 W Wait state
15 P Problem state
16-17 ILC Instruction-Length Code[5]
18-19 CC Condition Code
20-23 PM
Program Mask
Bit Meaning
20 Fixed-point overflow
21 Decimal overflow
22 Exponent underflow
23 Significance
24-31 Spare
32-63 IA Instruction Address

S/370

[edit]
IBM S/370 PSW formats
S/370 Basic Control mode PSW[6]

Chan.
Mask 		I
O 		E
X 		Key 0 M W P Interruption Code
0 1 2 4 5 6 7 8 11 12 13 14 15 16 31

ILC CC Program
Mask 		Instruction Address
32 33 34 35 36 39 40 63
S/370 BC mode PSW abbreviations
Bits Field Meaning
0-5 Channel Masks for channels 0-5
6 IO I/O Mask for channels > 5
7 EX External Mask
8-11 Key PSW key
12 E=0 Basic Control mode
13 M Machine-check mask
14 W Wait state
15 P Problem state
16-31 IC Interruption Code[7]
32-33 ILC Instruction-Length Code[8]
34-35 CC Condition Code
36-39 PM
Program Mask
Bit Meaning
36 Fixed-point overflow
37 Decimal overflow
38 Exponent underflow
39 Significance
40-63 IA Instruction Address
S/370 Extended Control mode PSW[9]

0 R 0 0 0 T I
O 		E
X 		Key E M W P S 0 CC Program
Mask 		0 0 0 0 0 0 0 0
0 1 2 4 5 6 7 8 11 12 13 14 15 16 17 18 19 20 23 24 31

0 0 0 0 0 0 0 0 Instruction Address
32 39 40 63
S/370 EC mode PSW abbreviations
Bits Field Meaning
1 R PER Mask
5 T DAT mode
6 IO I/O Mask; subject to channel mask in CR2
7 EX External Mask; subject to external subclass mask in CR0
8-11 Key PSW key
12 E=1 Extended Control mode
13 M Machine-check mask
14 W Wait state
15 P Problem state
16 S Address-Space Control
0=primary-space mode
1=Secondary-space mode
18-19 CC Condition Code
20-23 PM
Program Mask
Bit Meaning
20 Fixed-point overflow
21 Decimal overflow
22 Exponent underflow
23 Significance
40-63 IA Instruction Address

S/370 Extended Architecture (S/370-XA)

[edit]
IBM Extended Architecture (XA) PSW format
Extended Architecture Extended Control mode PSW[10]

0 R 0 0 0 T I
O 		E
X 		Key E M W P S 0 CC Program
Mask 		0 0 0 0 0 0 0 0
0 1 2 4 5 6 7 8 11 12 13 14 15 16 17 18 19 20 23 24 31

A Instruction Address
32 33 63
S/370-XA EC mode PSW abbreviations
Bits Field Meaning
1 R PER Mask
5 T DAT mode
6 IO I/O Mask; subject to channel mask in CR2
7 EX External Mask; subject to external subclass mask in CR0
8-11 Key PSW key
12 E=1 Extended Control mode
13 M Machine-check mask
14 W Wait state
15 P Problem state
16 S Address-Space Control
0=primary-space mode
1=Secondary-space mode
18-19 CC Condition Code
20-23 PM
Program Mask
Bit Meaning
20 Fixed-point overflow
21 Decimal overflow
22 Exponent underflow
23 Significance
32 A Addressing mode
0=24 bit; 1=31 bit
33-63 IA Instruction Address

Enterprise Systems Architecture (ESA)

[edit]
IBM Enterprise Systems Architecture (ESA) PSW format
Enterprise Systems Architecture Extended Control mode PSW[11][12]

0 R 0 0 0 T I
O 		E
X 		Key E M W P AS CC Program
Mask 		0 0 0 0 0 0 0 0
0 1 2 4 5 6 7 8 11 12 13 14 15 16 17 18 19 20 23 24 31

A Instruction Address
32 33 63
ESA EC mode PSW abbreviations
Bits Field Meaning
1 R PER Mask
5 T DAT mode
6 IO I/O Mask; subject to channel mask in CR2
7 EX External Mask; subject to external subclass mask in CR0
8-11 Key PSW key
12 E=1 Extended Control mode
13 M Machine-check mask
14 W Wait state
15 P Problem state
16-17 AS Address-Space Control
00=primary-space mode
01=Access-register mode
10=Secondary-space mode
11=Home-space mode
18-19 CC Condition Code
20-23 PM
Program Mask
Bit Meaning
20 Fixed-point overflow
21 Decimal overflow
22 Exponent underflow[a]
23 Significance[b]
32 A Addressing mode
0=24 bit; 1=31 bit
33-63 IA Instruction Address

z/Architecture

[edit]
IBM z/Architecture PSW formats
z/Architecture long PSW[13]

0 R 0 0 0 T I
O 		E
X 		Key 0 M W P AS CC Program
Mask 		R
I 		0 0 0 0 0 0 E
A
0 1 2 4 5 6 7 8 11 12 13 14 15 16 17 18 19 20 23 24 30 31

B
A 		0
32 33 63

Instruction Address
64 95

Instruction Address (Continued)
96 127
Long PSW abbreviations
Bits Field Meaning
1 R PER Mask
5 T DAT mode
6 IO I/O mask
7 EX External Mask
8-11 Key PSW key
12 E=0 Must be zero for LPSWE
13 M Machine-check mask
14 W Wait state
15 P Problem state
16-17 AS Address-Space Control
00=primary-space mode
01=Access-register mode
10=Secondary-space mode
11=Home-space mode
18-19 CC Condition Code
20-23 PM
Program Mask
Bit Meaning
20 Fixed-point overflow
21 Decimal overflow
22 HFP Exponent underflow
23 HFP Significance
24 RI Reserved for IBM
31 EA Extended Addressing mode
0=defined by BA below; 1=64-bit, BA must be zero
32 BA Basic Addressing mode
0=24 or 64; 1=31
64-127 IA Instruction Address
z/Architecture short PSW[14]

0 R 0 0 0 T I
O 		E
X 		Key 1 M W P AS CC Program
Mask 		R
I 		0 0 0 0 0 0 E
A
0 1 2 4 5 6 7 8 11 12 13 14 15 16 17 18 19 20 23 24 25 30 31

B
A 		Instruction Address
32 33 63
Short PSW abbreviations
Bits Field Meaning
1 R PER Mask
5 T DAT mode
6 IO I/O mask
7 EX External Mask
8-11 Key PSW key
12 E=1 Must be one for LPSW
13 M Machine-check mask
14 W Wait state
15 P Problem state
16-17 AS Address-Space Control
00=primary-space mode
01=Access-register mode
10=Secondary-space mode
11=Home-space mode
18-19 CC Condition Code
20-23 PM
Program Mask
Bit Meaning
20 Fixed-point overflow
21 Decimal overflow
22 HFP Exponent underflow
23 HFP Significance
24 RI Reserved for IBM
31 EA Extended Addressing mode
0=defined by BA below; 1=64-bit, BA must be zero
32 BA Basic Addressing mode
0=24 or 64; 1=31
33-63 IA Instruction Address

References

[edit]
  1. ^ S360, p. 15, Program Status Word.
  2. ^ S370, pp. 15–16, Interruption.
  3. ^ S370, p. 156, Instruction Length Recording.
  4. ^ S360, pp. 15–16, Instruction Fetching and Execution.
  5. ^ S370, p. 156, Instruction-Length Code.
  6. ^ S370, pp. 4-8 –&#32, 4–9, Program-Status Word Format in BC Mode.
  7. ^ S370, pp. 6-3 –&#32, 6–5, Interruption Action.
  8. ^ S370, pp. 6-7 –&#32, 6–9, Instruction-Length Code.
  9. ^ S370, pp. 4-6 –&#32, 4–7, Program-Status Word Format in EC Mode.
  10. ^ S370-XA, p. 4-5, Program-Status-Word Format.
  11. ^ S370-ESA, p. 4-5, Program-Status-Word Format.
  12. ^ S390-ESA, p. 4-5, Program-Status-Word Format.
  13. ^ z, pp. 4-5 –&#32, 4–8, Program-Status-Word Format.
  14. ^ z, p. 4-8, Short PSW Format.
S360
IBM System/360 Principles of Operation (PDF) (Eighth ed.). IBM. September 1968. A22-6821-7.
func67
IBM System/360 Model 67 Functional Characteristics (PDF) (Third ed.). IBM. February 1972. GA27-2719-2.
S370
IBM System/370 Principles of Operation (PDF) (Eleventh ed.). IBM. September 1987. A22-7000-10.
S370-XA
IBM System/370 Extended Architecture Principles of Operation (PDF) (Second ed.). IBM. January 1987. SA22-7085-1.
S370-ESA
IBM Enterprise Systems Architecture/370 Principles of Operation (PDF) (First ed.). IBM. August 1988. SA22-7200-0.
S/390-ESA
IBM Enterprise Systems Architecture/390 Principles of Operation (PDF) (Ninth ed.). IBM. June 2003. SA22-7201-08.
z
z/Architecture Principles of Operation (PDF) (Thirteenth ed.). IBM. September 2019. SA22-7832-12.


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