Adding a condition on a hardware watchpoint based on watchpoint state

Adding a condition on a hardware watchpoint based on watchpoint state

[Roger Phillips]

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Greetings,

I want to install a condition on a hardware watchpoint so that only accesses are stopped that increase the value of the variable 1 -> 2 etc.

Is this possible?

Regards

Re: Adding a condition on a hardware watchpoint based on watchpoint state

[Tom de Vries]

On 8/28/23 13:41, Roger Phillips via Gdb wrote:
> Greetings,
> 
> I want to install a condition on a hardware watchpoint so that only accesses are stopped that increase the value of the variable 1 -> 2 etc.
> 
> Is this possible?
> 

There's an enhancement PR open about this (
https://sourceware.org/bugzilla/show_bug.cgi?id=29480 ).

Thanks,
- Tom

Re: Adding a condition on a hardware watchpoint based on watchpoint state

[Roger Phillips]

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Very well, thank you. Can you imagine if and when this goes into a release?

Regards

________________________________
From: Tom de Vries <tdevries@suse.de>
Sent: Tuesday, August 29, 2023 10:24 AM
To: Roger Phillips <heidegg@hotmail.com>; gdb@sourceware.org <gdb@sourceware.org>
Subject: Re: Adding a condition on a hardware watchpoint based on watchpoint state

On 8/28/23 13:41, Roger Phillips via Gdb wrote:
> Greetings,
>
> I want to install a condition on a hardware watchpoint so that only accesses are stopped that increase the value of the variable 1 -> 2 etc.
>
> Is this possible?
>

There's an enhancement PR open about this (
https://sourceware.org/bugzilla/show_bug.cgi?id=29480 ).

Thanks,
- Tom

Re: Adding a condition on a hardware watchpoint based on watchpoint state

[Philippe Waroquiers]

In the meantime, you should be able to do what you want with command attached to the
watch point such as the below that watches the value of a variable i.

watch -location i
set var $prev = i
command $bpnum
if $prev < i
  printf "increase prev %d %d \n", $prev, i
  set var $prev = i
else
  printf "decrease prev %d %d \n", $prev, i
  set var $prev = i
  continue
end
end

On Tue, 2023-08-29 at 11:55 +0000, Roger Phillips via Gdb wrote:
> Very well, thank you. Can you imagine if and when this goes into a release?
> 
> Regards
> 
> ________________________________
> From: Tom de Vries <tdevries@suse.de>
> Sent: Tuesday, August 29, 2023 10:24 AM
> To: Roger Phillips <heidegg@hotmail.com>; gdb@sourceware.org <gdb@sourceware.org>
> Subject: Re: Adding a condition on a hardware watchpoint based on watchpoint state
> 
> On 8/28/23 13:41, Roger Phillips via Gdb wrote:
> > Greetings,
> > 
> > I want to install a condition on a hardware watchpoint so that only accesses are stopped that increase the value of the variable 1 -> 2 etc.
> > 
> > Is this possible?
> > 
> 
> There's an enhancement PR open about this (
> https://sourceware.org/bugzilla/show_bug.cgi?id=29480 ).
> 
> Thanks,
> - Tom
> 

Re: Adding a condition on a hardware watchpoint based on watchpoint state

[Roger Phillips]

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Thanks will try!

________________________________
From: Philippe Waroquiers <philippe.waroquiers@skynet.be>
Sent: Friday, September 1, 2023 7:00 PM
To: Roger Phillips <heidegg@hotmail.com>; Tom de Vries <tdevries@suse.de>; gdb@sourceware.org <gdb@sourceware.org>
Subject: Re: Adding a condition on a hardware watchpoint based on watchpoint state

In the meantime, you should be able to do what you want with command attached to the
watch point such as the below that watches the value of a variable i.

watch -location i
set var $prev = i
command $bpnum
if $prev < i
  printf "increase prev %d %d \n", $prev, i
  set var $prev = i
else
  printf "decrease prev %d %d \n", $prev, i
  set var $prev = i
  continue
end
end

On Tue, 2023-08-29 at 11:55 +0000, Roger Phillips via Gdb wrote:
> Very well, thank you. Can you imagine if and when this goes into a release?
>
> Regards
>
> ________________________________
> From: Tom de Vries <tdevries@suse.de>
> Sent: Tuesday, August 29, 2023 10:24 AM
> To: Roger Phillips <heidegg@hotmail.com>; gdb@sourceware.org <gdb@sourceware.org>
> Subject: Re: Adding a condition on a hardware watchpoint based on watchpoint state
>
> On 8/28/23 13:41, Roger Phillips via Gdb wrote:
> > Greetings,
> >
> > I want to install a condition on a hardware watchpoint so that only accesses are stopped that increase the value of the variable 1 -> 2 etc.
> >
> > Is this possible?
> >
>
> There's an enhancement PR open about this (
> https://sourceware.org/bugzilla/show_bug.cgi?id=29480 ).
>
> Thanks,
> - Tom
>