Jonathan Adams wrote:
>On Tue, Apr 11, 2006 at 08:22:15AM +0800, Oliver Yang wrote:
>
>
>>Sorry for raising the question again, maybe my question is not very clear...
>>
>>Actually, I need check the general register's value for a specific CPU
>>on MP system. But, it seems like ::regs couldn't meet my requirement.
>>Does anybody know the other way?
>>
>>
>
>Typically, you want to look at the trap frame on the active thread on the
>CPU. I haven't done this on i386 in a while; can someone chime in with the
>procedure?
>
>On sparc, you just take the active thread on the cpu, do a ::findstack on it,
>take the ktl0 frame address, and do:
>
> addr::print struct frame fr_local[7] | ::print struct regs
>
>
Sorry. Thank you for your response, although I'm not familiar with sparc
platform.
I ask this question because sometimes ::findstack doesn't work for me on
my crashdump file:
> ::cpuinfo -v
ID ADDR FLG NRUN BSPL PRI RNRN KRNRN SWITCH THREAD PROC
0 fec22eb4 1b 1 6 165 no no t-0 cb956de0 sched
| | |
RUNNING <--+ | +--> PIL THREAD
READY | 6 cb956de0
EXISTS |
ENABLE +--> PRI THREAD PROC
0 cca2a600 rsh
ID ADDR FLG NRUN BSPL PRI RNRN KRNRN SWITCH THREAD PROC
1 cc1449c0 1f 2 0 -1 no no t-0 cc2e6de0 sched
| |
RUNNING <--+ +--> PRI THREAD PROC
READY 60 cba61de0 sched
QUIESCED 60 cbaa7de0 sched
EXISTS
ENABLE
> cb956de0::findstack
stack pointer for thread cb956de0: cb956ab8
cb956de0 0xcc9f7130()
> cc2e6de0::findstack
Possible stack pointers for thread cc2e6de0:
cc2e6d00 (2)
cc2e6d54 (2)
cc2e6db8 (2)
> cb956ab8,30/nap
If ::findstack doesn't work, we have to check stack by stack pointer
register (esp) on x86.
But you know, ::regs just can output 1 cpu's register value, in above
case, I couldn't get cpu 1 's register value.
Someone told me that kmdb have a ::cpuregs dcmd can meet my requirement:
::cpuregs [ -c cpuid ]
Display the current general-purpose register set for the current CPU or
the specified cpuid. This command is only available when using kmdb.
But it couldn't work under mdb, that means I couldn't use it on a kernel
crash dump file.
I don't know why mdb don't support ::cpuregs dcmd?
--
Cheers,
----------------------------------------------------------------------
Oliver Yang | OPG Engineering Operation | Oliver.Yang at Sun.COM | x82229
