Re: [PATCH]: Make Linux use the new unified x86 watchpoint support

[Andrew Cagney <ac131313@cygnus.com>]

Mark Kettenis wrote:
> 
>    Date: Tue, 27 Mar 2001 08:55:00 +0200 (IST)
>    From: Eli Zaretskii <eliz@is.elta.co.il>
> 
>    On Mon, 26 Mar 2001, Michael Snyder wrote:
> 
>    > Guys, this implementation has problems.  You have it hard-coded
>    > so that on a linux host, it unconditionally calls native linux
>    > methods involving ptrace to get the debug registers.  This breaks
>    > very badly if you're using a native linux host to debug a remote
>    > i386 target.
> 
> Just like the old implementation.  I suspect the old implementation
> just happened to work because it didn't do any strict error checking.
> 
> The fundamental problem is that the watpoint-stuff isn't part of the
> target vector.

I think it is a combination of both the architecture and the target
vector.  It is the same problem as software single step.  A layer of the
target is asked to implement a memory watch.  Since that can't be
implemented directly, it asks the architecture vector to implement it
for it.

	Andrew