Re: Target can step over breakpoints itself

[teawater <teawater@gmail.com>]

This patch is cool!

I make a simulator can step over breakpoint with itself in before. I
think a lot of simulator can do it too. Cause they can control
breakpoint with itself.

On Mon, Oct 27, 2008 at 22:19, Pedro Alves <pedro@codesourcery.com> wrote:
> When adding non-stop debugging support to a target/arch, one of the
> most important aspects we need to take care of, is to have a means
> to step over breakpoints without removing them from the inferior,
> otherwise, other running threads may miss them.  We've added a mechanism
> to GDB that does out-of-line single-stepping (displaced stepping), which
> we use on linux x86 and ppc.  The smarts to do this are all on the GDB side.
>
> DICOS debug API can take care of magically stepping over software
> breakpoints transparently, which means that we don't have to resort to
> do displaced stepping on the GDB side.
>
> The attached patch adds a new "StepOverBreakpoints" feature to the
> remote protocol to the remote stub can tell GDB that the debug api has
> that feature, and exposes that knowledge to the rest of GDB by
> adding a new target_ops method (target_can_step_over_breakpoints),
> and teaching infrun.c to it doesn't need to do the traditional hold-and-step
> dance (remove breakpoints, single-step, insert breakpoints) from the
> inferior(s), if the target reports support for stepping over them
> itself.
>
> Any objections/thoughts on this?
>
> --
> Pedro Alves
>