software single step - feature request

software single step - feature request

[Quality Quorum]

Hi,


There are a few nits associated with soft single step support, which are
easy to work around but annoying enough to justify a fix.

1. Soft single step is configured per platform (e.g. arm-wince has one
   and generic arm does not), IMHO, it should be provided on per CPU
   basis.

2. It has to be provided for every CPU - may be as part of multi-arch
   transition.

3. It should be run-time configurable - so it should be possible to
   use the same gdb image both with and without soft single step.

4. If target supports hw single step it should be possible to configure
   removal of breakpoints before stepping.


Thanks,

Aleksey

Re: software single step - feature request

[Andrew Cagney]

> Hi,
> 
> 
> There are a few nits associated with soft single step support, which are
> easy to work around but annoying enough to justify a fix.


Your not alone.  This is taken from gdbarch.sh:

# FIXME/cagney/2001-01-18: This should be split in two.  A target method 
that indicat
es if
# the target needs software single step.  An ISA method to implement it.
#
# FIXME/cagney/2001-01-18: This should be replaced with something that 
inserts breakp
oints
# using the breakpoint system instead of blatting memory directly (as 
with rs6000).
#
# FIXME/cagney/2001-01-18: The logic is backwards.  It should be asking 
if the target
  can
# single step.  If not, then implement single step using breakpoints.
F:2:SOFTWARE_SINGLE_STEP:void:software_single_step:enum target_signal 
sig, int insert
_breakpoints_p:sig, insert_breakpoints_p::0:0


> 1. Soft single step is configured per platform (e.g. arm-wince has one
>    and generic arm does not), IMHO, it should be provided on per CPU
>    basis.
> 
> 2. It has to be provided for every CPU - may be as part of multi-arch
>    transition.
> 
> 3. It should be run-time configurable - so it should be possible to
>    use the same gdb image both with and without soft single step.
> 
> 4. If target supports hw single step it should be possible to configure
>    removal of breakpoints before stepping.
> 
> 
> Thanks,
> 
> Aleksey


see gdb/120

Re: software single step - feature request

[Quality Quorum]

On Tue, 15 Jan 2002, Andrew Cagney wrote:

> > Hi,
> >
> >
> > There are a few nits associated with soft single step support, which are
> > easy to work around but annoying enough to justify a fix.
>
>
> Your not alone.  This is taken from gdbarch.sh:
>
> ...

So, there is a hope then that it will be implemented one day.

I am wondering, whether all items below will see the light one day ?

> > 1. Soft single step is configured per platform (e.g. arm-wince has one
> >    and generic arm does not), IMHO, it should be provided on per CPU
> >    basis.
> >
> > 2. It has to be provided for every CPU - may be as part of multi-arch
> >    transition.
> >
> > 3. It should be run-time configurable - so it should be possible to
> >    use the same gdb image both with and without soft single step.
> >
> > 4. If target supports hw single step it should be possible to configure
> >    removal of breakpoints before stepping.
>
> see gdb/120

I am sorry I am not that deeply involved into gdb development.

>
>
>

Thanks,

Aleksey