Single Step command

Single Step command

[Guillaume MENANT]

Hello,
1 - The "s" (Single Step) command has an optionnal address value. How 
does it works ? It's like a "run until" this address ?
2 - What is the reply for an "s" (Single Step) command for an error ? I 
haven't seen a "E" reply in the Stop Reply Packets.
Thanks.

-- 

Guillaume MENANT

Re: Single Step command

[Andreas Schwab]

Guillaume MENANT <guillaume.menant@geensys.com> writes:

> Hello,
> 1 - The "s" (Single Step) command has an optionnal address value. How does
> it works ? It's like a "run until" this address ?

From the gdb documentation:

`s [ADDR]'
     Single step.  ADDR is the address at which to resume.  If ADDR is
     omitted, resume at same address.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Single Step command

[Guillaume MENANT]

Yes, i read it too but i'm not sure i've well understand these sentences 
(i'm french).

Guillaume MENANT


Andreas Schwab a écrit :
> Guillaume MENANT <guillaume.menant@geensys.com> writes:
>
>   
>> Hello,
>> 1 - The "s" (Single Step) command has an optionnal address value. How does
>> it works ? It's like a "run until" this address ?
>>     
>
> >From the gdb documentation:
>
> `s [ADDR]'
>      Single step.  ADDR is the address at which to resume.  If ADDR is
>      omitted, resume at same address.
>
> Andreas.
>
>   

Re: Single Step command

[Michael Snyder]

On Mon, 2007-11-19 at 14:56 +0100, Guillaume MENANT wrote:

> 2 - What is the reply for an "s" (Single Step) command for an error ? I 
> haven't seen a "E" reply in the Stop Reply Packets.

The final authority is the code.

remote.c/remote_wait:

      switch (buf[0])
        {
        case 'E':               /* Error of some sort.  */
          warning (_("Remote failure reply: %s"), buf);
          continue;

The norm for an error reply is "Exy" where x and y are decimal
digits.  gdb does not really pay attention to the value in most
cases (including this one).

Re: Single Step command

[Michael Snyder]

OK -- it means that if the optional address is supplied, 
the program counter will be loaded with that address
BEFORE the step is executed.

Semantically it is the same as a goto followed by a step.


On Mon, 2007-11-19 at 15:13 +0100, Guillaume MENANT wrote:
> Yes, i read it too but i'm not sure i've well understand these sentences 
> (i'm french).
> 
> Guillaume MENANT
> 
> 
> Andreas Schwab a écrit :
> > Guillaume MENANT <guillaume.menant@geensys.com> writes:
> >
> >   
> >> Hello,
> >> 1 - The "s" (Single Step) command has an optionnal address value. How does
> >> it works ? It's like a "run until" this address ?
> >>     
> >
> > >From the gdb documentation:
> >
> > `s [ADDR]'
> >      Single step.  ADDR is the address at which to resume.  If ADDR is
> >      omitted, resume at same address.
> >
> > Andreas.
> >
> >