Re: Is it possible to support gdb command hbreak with target sim ?

Mike Frysinger via Gdb <[email protected]> Wed, 13 Jan 2021 06:08:58 -0500

Newsgroups	gmane.comp.gdb.devel
Message-ID	<20210113110858.GD6938@vapier>

On 13 Jan 2021 00:46, Mike Frysinger via Gdb wrote:
> On 29 Sep 2020 09:46, Andrew Burgess wrote:
> > * William Tambe via Gdb <[email protected]> [2020-09-28 21:29:26 -0500]:
> > > Is it possible to support gdb command hbreak with target sim ?
> > 
> > There's currently no support for hardware breakpoints in the simulator
> > target, instead only software breakpoints are supported where GDB
> > takes responsibility for reading and backing up the old memory
> > contents before writing in a software breakpoint instruction.
> > 
> > This doesn't mean that hardware breakpoint support couldn't be added.
> 
> this is a bit inaccurate.  i guess "hardware breakpoints" are a bit
> confusing when talking about simulators.  and depending on who you
> talk to, they might call them "watchpoints" rather than "breakpoints".
> 
> there is a sim-watch module that some sim's support.  looks like:
>   avr bfin frv iq2000 m32r mips mn10300 moxie v850
> 
> so if you're using one of those, it'd be something like:
>   $ gdb <prog>
>   (gdb) target sim --watch-pc-int 0x1234
>   (gdb) load
>   (gdb) run
> 
> that said, it appears to have a few bugs.  i'm not sure how well it's
> tested :).  g'luck!

i've posted some fixes so things should work much better for gdb-11.

but to your original question, i don't think the sim target integrates
with gdb's "hbreak" command.  i haven't looked at those codepaths in
quite sometime though tbh, and gdb has changed drastically since.

maybe Andrew would know offhand.
-mike

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