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Date: Tue, 06 Nov 2001 15:15:00 -0000
To: Christopher Faylor <cgf@redhat.com>, gdb@sources.redhat.com
From: muller@cerbere.u-strasbg.fr
Subject: Re: x86 hardware breakpoint question
In-Reply-To: <20011116205455.GA18328@redhat.com>
References: <2593-Fri16Nov2001184752+0200-eliz@is.elta.co.il>
 <20011115125927.B3449@atlas.lcs.mit.edu>
 <20011115125927.B3449@atlas.lcs.mit.edu>
 <4.2.0.58.20011116135651.0128d658@ics.u-strasbg.fr>
 <2593-Fri16Nov2001184752+0200-eliz@is.elta.co.il>
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At 15:54 16/11/01 -0500, Christopher Faylor wrote:
>On Fri, Nov 16, 2001 at 06:47:52PM +0200, Eli Zaretskii wrote:
>>>    cygwin that completely relies on win32 API calls does not support
>>> hardware breakpoint (nor watchpoints)
>>> because there is no API call to set a hardware trap.
>>
>>I think this is just because no one implemented Cygwin support for the
>>new facilities on i386-nat.c.  When this was discussed a few months
>>ago, someone, I think DJ Delorie, posted a list of Win32 API entries
>>that support hardware watchpoints and breakpoints.
>
>I can't find this, Eli.  Can you provide any clues on what to look for?
>I'd like to have hardware brekpoints into cygwin if I can.

I had pseudo-hardware watchpoints working using the page protection
mechanisms available with the VirtualXXX functions.

 I am trying to get up to date my old code that added
"hardware" watchpoints with VirtualProtectEx.
As soon as this works correctly again, I will send 
a patch, even if my code is far from optimal,
because otherwise it will again get lost in 
confilcts with future changes...