GDB RSP try 'p' before 'g'

GDB RSP try 'p' before 'g'

[Robert Bu]

Hello all,

    When doing remote debugging, GDB, version 6.0 and before, tries to
fetch the registers' value by 'g' packet when connected to remote
target. However, GDB version 6.4 and later, tries 'p' packet before 'g'
packet. So if the target supports 'p' packet, GDB uses 'p' packet to
retrieve value of all registers. That may degrate the speed for the poor
connection speed (Serial, parallel or even ethernet) between GDB and the
target.
    Does anybody know what is that change for?

Thanks.

Robert.
20071024

Re: GDB RSP try 'p' before 'g'

[Daniel Jacobowitz]

On Wed, Oct 24, 2007 at 04:29:54PM +0800, Robert Bu wrote:
> Hello all,
> 
>     When doing remote debugging, GDB, version 6.0 and before, tries to
> fetch the registers' value by 'g' packet when connected to remote
> target. However, GDB version 6.4 and later, tries 'p' packet before 'g'
> packet. So if the target supports 'p' packet, GDB uses 'p' packet to
> retrieve value of all registers. That may degrate the speed for the poor
> connection speed (Serial, parallel or even ethernet) between GDB and the
> target.
>     Does anybody know what is that change for?

If you don't want this to happen, I recommend you do not provide the
'p' packet or else use a newer GDB.  Earlier versions of GDB did not
support 'p' at all.  I believe I made GDB smarter about this around
6.6 or 6.7.

-- 
Daniel Jacobowitz
CodeSourcery