From: Mark Wielaard <mark@klomp.org>
To: Phil Muldoon <pmuldoon@redhat.com>
Cc: Roland McGrath <roland@redhat.com>, Frysk Hackers <frysk@sourceware.org>
Subject: Re: Optimizing watchpoints
Date: Mon, 01 Oct 2007 09:20:00 -0000 [thread overview]
Message-ID: <1191230426.3842.34.camel@dijkstra.wildebeest.org> (raw)
In-Reply-To: <4700B9C2.8030005@redhat.com>
Hi Phil,
On Mon, 2007-10-01 at 10:11 +0100, Phil Muldoon wrote:
> Mark Wielaard wrote:
> > Just a FYI. I see (through a quick kernel grep) PTRACE_SET_DEBUGREG is
> > only available on powerpc. For x86[_64] frysk pokes at the hardware
> > debug registers through the USR area and getting/setting them
> > "directly". This might have to become a special case of the above.
> >
> Is this a hardware/OS difference do you know, or just a different
> implementation in the Frysk PPC ISA?
A quick look at the kernel sources makes me believe that this is a
kernel/ptrace difference in how to access debug registers between
different architectures. The PPC Isa is Frysk doesn't yet support
hardware debug register access. But my guess is that it just means it
would use a different bank, while on x86 we just see the debug registers
as part of the USR bank.
Cheers,
Mark
next prev parent reply other threads:[~2007-10-01 9:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-28 21:21 Phil Muldoon
2007-09-30 19:10 ` Mark Wielaard
2007-10-01 1:25 ` Roland McGrath
2007-10-01 8:41 ` Mark Wielaard
2007-10-01 9:11 ` Phil Muldoon
2007-10-01 9:20 ` Mark Wielaard [this message]
2007-10-01 17:40 ` Roland McGrath
2007-10-01 17:54 ` Phil Muldoon
2007-10-10 7:11 ` Phil Muldoon
2007-10-10 10:28 ` Mark Wielaard
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