Re: [RFC/RFA] Add hardware watchpoint support for cygwin target.

[Christopher Faylor <cgf@redhat.com>]

On Wed, Nov 28, 2001 at 08:13:12PM +0200, Eli Zaretskii wrote:
>> Date: Wed, 28 Nov 2001 18:44:44 +0100
>> From: Pierre Muller <muller@cerbere.u-strasbg.fr>
>> 
>> But te are some annoying things,
>> the most annoying is that an exception seems to be generated
>> on read access of the watched area even if you only set a normal
>> watchpoint (which should use a write-only debug feature).
>
>So you are saying that watch, rwatch, and awatch all yield the same
>behavior?
>
>Are you sure that you pass the watchpoint information correctly to
>the OS?  For example, is the format of DR7 as the OS wants it
>identical to what GDB uses?  The layout of bits in dr_control_mirror
>follows Intel documentation, but the OS might want those bits in a
>different format (that's what the corresponding DPMI call does, for
>example).  I don't have Windows docs, so I cannot check this.
>
>> > /* Get the value of the DR6 debug status register from the inferior.
>> >    Here we just return the value stored in D_REGS, as we've got it
>> >    from the last go32_wait call.  */
>
>I believe you didn't really mean ``go32_wait'' here ;-)

I'd like some clarification on this before I can accept the patch.  It
seems like the described behavior would be annoying indeed.  It would
be nice to fix this.