Re: adjust watchpoint testing

[Wu Zhou <woodzltc at cn dot ibm dot com>]

Nathan,

I see your code have such two lines:

+     if [target_info exists gdb,hardware_watchpoints] {
+       set nwatch [target_info gdb,hardware_watchpoints]

Where is this target_info variable set up?  Did you set that somewhere in 
the dejagnu package?  I am very curious about how it is implemented.

I am now using a test and trial method.  If rwatch command reports that 
this type of hw watchpoint is not supported, then I will assume this 
target don't support hardware watchpoint; if it replys with a message 
"Hardware read watchpoint...", then I assume it is supported.  But I 
don't figure out how to get precisely how many hw watchpoints the 
target support?  How did you make that?  Can you share your idea with 
me?  Thanks a lot!

Regards
- Wu Zhou

On Mon, 12 Jun 2006, Nathan Sidwell wrote:

> Wu Zhou wrote:
> > Nathan,
> > 
> > I had similar concerns about these watchpoint tests with you.  However, I'd
> > like to propose a somewhat different solution.
> 
> > This target-dependent feature might incur confusion some where.  One may
> > have difficulty in knowing for sure what this case is trying to test: s/w
> > watchpoint, or h/w watchpoint, or both?  If there are errors reported, what
> > type of watchpoint trigger that?  To track into the root cause, which code
> > to look at? 
> > To clarify the situation, I propose to let recurse.exp based on totally on
> > software simulated watchpoint.  This can be done easily, by using "set
> > can-use-hardware-watchpoint 0".
> 
> Thanks for your comments. Over the weekend, I had a thought that the problem
> is the remote stub not telling gdb how many watchpoints it can support.  I
> think this is a thing for qPacketInfo to deal with, and I can talk to Dan
> about that.
> 
> nathan
> -- 
> Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery
> nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk
> 
>