Registers
Register values can be referenced by the KDB kernel debugger and the kdb command.
Register values can be used in subcommands
by preceding the register name with an at sign (@).
This character is also used to dereference addresses as described
in Expressions.
Registers that can be referenced include the following:
| Register | Description |
|---|---|
| asr | Address space register |
| cr | Condition register |
| ctr | Count register |
| dar | Data address register |
| dec | Decrementer |
| dsisr | Data storage interrupt status register |
| fp0-fp31 | Floating point registers 0 through 31 |
| fpscr | Floating point status and control register |
| iar | Instruction address register |
| lr | Link register |
| mq | Multiply quotient |
| msr | Machine State register |
| r0-r31 | General Purpose Registers 0 through 31 |
| rtcl | Real Time clock (nanoseconds) |
| rtcu | Real Time clock (seconds) |
| s0-s15 | Segment registers |
| sdr0 | Storage description register 0 |
| sdr1 | Storage description register 1 |
| srr0 | Machine status save/restore 0 |
| srr1 | Machine status save/restore 1 |
| tbl | Time base register, lower |
| tbu | Time base register, upper |
| tid | Transaction register (fixed point) |
| xer | Exception register (fixed point) |
Other special purpose registers that can be referenced, if they are supported on the hardware, include the following:
- sprg0
- sprg1
- sprg2
- sprg3
- pir
- fpecr
- ear
- pvr
- hid0
- hid1
- iabr
- dmiss
- imiss
- dcmp
- icmp
- hash1
- hash2
- rpa
- buscsr
- l2cr
- l2sr
- mmcr0
- mmcr1
- pmc1
- pmc2
- pmc3
- pmc4
- pmc5
- pmc6
- pmc7
- pmc8
- sia
- sda