In a remote debug session, how do I get to see fresh register values each time I do a 'show all-registers'?

In a remote debug session, how do I get to see fresh register values each time I do a 'show all-registers'?

[Anmol P. Paralkar]

Hello,

  I am using GDB 6.6, (ppc64-elf) to remote debug linux running
  on a PowerPC simulator. I can read the values of the GPR's in
  the simulator and upon a 'show all-registers', I do see that
  the registers have values as expected.

  However, on issuing a 'show all-registers' subsequently, I see
  GDB displaying the resgister values it displayed earlier - not
  the ones that the simulator now shows. What do I need to do to
  force GDB to get the fresh set of register values?

Thanks,
Anmol P. Paralkar

Re: In a remote debug session, how do I get to see fresh register values each time I do a 'show all-registers'?

[Daniel Jacobowitz]

On Sun, Apr 01, 2007 at 08:16:39PM -0500, Anmol P. Paralkar wrote:
> Hello,

>  I am using GDB 6.6, (ppc64-elf) to remote debug linux running
>  on a PowerPC simulator. I can read the values of the GPR's in
>  the simulator and upon a 'show all-registers', I do see that
>  the registers have values as expected.

>  However, on issuing a 'show all-registers' subsequently, I see
>  GDB displaying the resgister values it displayed earlier - not
>  the ones that the simulator now shows. What do I need to do to
>  force GDB to get the fresh set of register values?

What has happened to change the registers?  Did the program run, or
are the registers changing while GDB thinks the simulator is stopped?

In the first case, it's a GDB bug.  In the second case, try the
flushregs command.

-- 
Daniel Jacobowitz
CodeSourcery

Re: In a remote debug session, how do I get to see fresh register values each time I do a 'show all-registers'?

[Anmol P. Paralkar]

On Sun, 1 Apr 2007, Daniel Jacobowitz wrote:

> On Sun, Apr 01, 2007 at 08:16:39PM -0500, Anmol P. Paralkar wrote:
>> Hello,
>
>>  I am using GDB 6.6, (ppc64-elf) to remote debug linux running
>>  on a PowerPC simulator. I can read the values of the GPR's in
>>  the simulator and upon a 'show all-registers', I do see that
>>  the registers have values as expected.
>
>>  However, on issuing a 'show all-registers' subsequently, I see
>>  GDB displaying the resgister values it displayed earlier - not
>>  the ones that the simulator now shows. What do I need to do to
>>  force GDB to get the fresh set of register values?
>
> What has happened to change the registers?  Did the program run, or
> are the registers changing while GDB thinks the simulator is stopped?
>
> In the first case, it's a GDB bug.  In the second case, try the
> flushregs command.

  flushregs is exactly what I needed. Thank you. (Looking it up also made
  me aware of Appendix C: Maintenance commands).

  In the first case, please note that I *do* see behaviour as expected.
  (Sorry about not being clear, I should perhaps have worded it thus:
  "To begin with, I can read the values of the GPR's in the simulator
  and upon a 'show all-registers', I do see that the registers have
  values as expected. Then, later on, as the program (viz. linux) runs,
  and the simulator displays the changed register values, I issue a
  'show all-registers' again in GDB, hoping to see the new register
  values that the simulator now displays, but GDB continues to display
  the old values it displayed). [=> flushregs].

Regards,
Anmol P. Paralkar