Re: [Kgdb-bugreport] [PATCH][2/3] Update CVS KGDB's have kgdb_{schedule,process}_breakpoint

[Amit S. Kale]

On Tuesday 16 Mar 2004 6:32 pm, La Monte H.P. Yarroll wrote:
> Amit S. Kale wrote:
> >On Tuesday 16 Mar 2004 1:22 am, George Anzinger wrote:
> >>Amit S. Kale wrote:
> >>>On Friday 12 Mar 2004 1:33 pm, George Anzinger wrote:
> >>>>Amit S. Kale wrote:
> >>>>>On Friday 12 Mar 2004 2:58 am, George Anzinger wrote:
> >>>>>>Amit S. Kale wrote:
> >>>>>>~
> >>>>>>
> >>>>>>>>context any
> >>>>>>>>
> >>>>>>>>p fun()
> >>>>>>>
> >>>>>>>p fun() will push arguments on stack over the place where irq
> >>>>>>> occured, which is exactly how it'll run.
> >>>>>>
> >>>>>>Is this capability in kgdb lite?  It was one of the last things I
> >>>>>> added to -mm version.
> >>>>>
> >>>>>No! It's not present in kgdb heavy also. All you can do is set $pc,
> >>>>>continue.
> >>>>
> >>>>Possibly I can help here.  I did it for the mm version.  It does
> >>>> require a couple of asm bits and it sort of messes up the set/fetch
> >>>> memory, but it does do the job.
> >>>
> >>>I have seen that. It's too messy!
> >>
> >>You have a better solution?
> >
> >Nope.
> >
> >I think this feature is very likely to be abused by programmers. They do
> >deserve suffering if they choose to shoot at their own feet.
> >
> >Kernel programmers have to be aware of implementation of this feature if
> > they choose to call arbitrary functions. This includes knowing whether
> > interrupts are disabled, handling of exceptions in gdb called functions,
> > whether other processors run, that breakpoints are  disabled. Given that
> > kgdb is used for learning the kernel, such features are best kept aside.
> >
> >-Amit
>
> Pardon my question.  I've lost track of the thread and the available
> context doesn't really help me.
>
> Is this the ability to step into an arbitrary function from the gdb command
> line or something else?

This is ability to call arbitray function from gdb command line.
Example 
(gdb) p myfunction(1,2,3)
-Amit

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