IBM PowerPC 750GX User Manual page 110

User's Manual
IBM PowerPC 750GX and 750GL RISC Microprocessor
Table 2-33. PowerPC Encodings
Register Name
DBAT7L
DBAT7U
DEC
DSISR
EAR
IBAT0L
IBAT0U
IBAT1L
IBAT1U
IBAT2L
IBAT2U
IBAT3L
IBAT3U
IBAT4L
IBAT4U
IBAT5L
IBAT5U
IBAT6L
IBAT6U
IBAT7L
IBAT7U
LR
PVR
SDR1
SPRG0
SPRG1
SPRG2
SPRG3
SRR0
SRR1
Note:
1. The order of the two 5-bit halves of the SPR number is reversed compared with actual instruction coding. For mtspr and mfspr
instructions, the SPR number coded in assembly language does not appear directly as a 10-bit binary number in the instruction.
The number coded is split into two 5-bit halves that are reversed in the instruction, with the high-order five bits appearing in bits
16–20 of the instruction and the low-order five bits in bits 11–15.
2. The TB Registers are referred to as TBRs rather than SPRs and can be written to using the mtspr instruction in supervisor mode
and the TBR numbers here. The TB Registers can be read in user mode using either the mftb or mfspr instruction and specifying
TBR 268 for TBL and SPR 269 for TBU.
Programming Model
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1
SPR
Decimal SPR[5–9]
575 10001
574 10001
22 00000
18 00000
282 01000
529 10000
528 10000
531 10000
530 10000
533 10000
532 10000
535 10000
534 10000
561 10001
560 10001
563 10001
562 10001
565 10001
564 10001
567 10001
566 10001
8 00000
287 01000
25 00000
272 01000
273 01000
274 01000
275 01000
26 00000
27 00000
Access
SPR[0–4]
11111 Supervisor (OEA)
11110 Supervisor (OEA)
10110 Supervisor (OEA)
10010 Supervisor (OEA)
11010 Supervisor (OEA)
10001 Supervisor (OEA)
10000 Supervisor (OEA)
10011 Supervisor (OEA)
10010 Supervisor (OEA)
10101 Supervisor (OEA)
10100 Supervisor (OEA)
10111 Supervisor (OEA)
10110 Supervisor (OEA)
10001 Supervisor (OEA)
10000 Supervisor (OEA)
10011 Supervisor (OEA)
10010 Supervisor (OEA)
10101 Supervisor (OEA)
10100 Supervisor (OEA)
10111 Supervisor (OEA)
10110 Supervisor (OEA)
01000 User (UISA)
11111 Supervisor (OEA)
11001 Supervisor (OEA)
10000 Supervisor (OEA)
10001 Supervisor (OEA)
10010 Supervisor (OEA)
10011 Supervisor (OEA)
11010 Supervisor (OEA)
11011 Supervisor (OEA)
mfspr/mtspr
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
Both
mfspr
Both
Both
Both
Both
Both
Both
Both
gx_02.fm.(1.2)
March 27, 2006