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Date: Tue, 06 Nov 2001 17:12:00 -0000
To: DJ Delorie <dj@redhat.com>, cgf@redhat.com
From: muller@cerbere.u-strasbg.fr
Subject: Re: x86 hardware breakpoint question
Cc: gdb@sources.redhat.com
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References: <20011116205455.GA18328@redhat.com>
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 <4.2.0.58.20011116135651.0128d658@ics.u-strasbg.fr>
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At 17:32 16/11/01 -0500, DJ Delorie wrote:
>
>> 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.
>
>SetThreadContext can set the hardware debug registers.
Did you try this out already ?

  Because one of the problems that I got with my code
that uses VirtualProtectEx is that I can't change the
single step bit inside a system DLL (under win95 at least).

This forced me to add some complicated code,
that goes up the frame and sets a breakpoint at the first not
system DLL return address.

 Outside system DLL I can single step over an
instruction that triggered the page protection
(momentantly disabling that protection) if
the address triggering the page protection is
not a watched address.

  So I am surprised to hear that win32
lets you set debug registers, but if that works, great!

 Are the debug registers process wide or
thread specific in that case ?