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User’s Manual
IBM PowerPC 750GX and 750GL RISC Microprocessor
Programming Model
Page 110 of 377
gx_02.fm.(1.2)
March 27, 2006
DBAT7L 575 10001 11111 Supervisor (OEA) Both
DBAT7U 574 10001 11110 Supervisor (OEA) Both
DEC 22 00000 10110 Supervisor (OEA) Both
DSISR 18 00000 10010 Supervisor (OEA) Both
EAR 282 01000 11010 Supervisor (OEA) Both
IBAT0L 529 10000 10001 Supervisor (OEA) Both
IBAT0U 528 10000 10000 Supervisor (OEA) Both
IBAT1L 531 10000 10011 Supervisor (OEA) Both
IBAT1U 530 10000 10010 Supervisor (OEA) Both
IBAT2L 533 10000 10101 Supervisor (OEA) Both
IBAT2U 532 10000 10100 Supervisor (OEA) Both
IBAT3L 535 10000 10111 Supervisor (OEA) Both
IBAT3U 534 10000 10110 Supervisor (OEA) Both
IBAT4L 561 10001 10001 Supervisor (OEA) Both
IBAT4U 560 10001 10000 Supervisor (OEA) Both
IBAT5L 563 10001 10011 Supervisor (OEA) Both
IBAT5U 562 10001 10010 Supervisor (OEA) Both
IBAT6L 565 10001 10101 Supervisor (OEA) Both
IBAT6U 564 10001 10100 Supervisor (OEA) Both
IBAT7L 567 10001 10111 Supervisor (OEA) Both
IBAT7U 566 10001 10110 Supervisor (OEA) Both
LR 8 00000 01000 User (UISA) Both
PVR 287 01000 11111 Supervisor (OEA) mfspr
SDR1 25 00000 11001 Supervisor (OEA) Both
SPRG0 272 01000 10000 Supervisor (OEA) Both
SPRG1 273 01000 10001 Supervisor (OEA) Both
SPRG2 274 01000 10010 Supervisor (OEA) Both
SPRG3 275 01000 10011 Supervisor (OEA) Both
SRR0 26 00000 11010 Supervisor (OEA) Both
SRR1 27 00000 11011 Supervisor (OEA) Both
Table 2-33. PowerPC Encodings (Page 2 of 3)
Register Name
SPR
1
Access mfspr/mtspr
Decimal SPR[5–9] SPR[0–4]
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.