linux-kernel - Re: [RFC] [PATCH] selective signal ptracing

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Message-ID: <625fc13d0706180615t2f327b16rf648b2ee56da6ed9@mail.gmail.com>
Date:	Mon, 18 Jun 2007 08:15:37 -0500
From:	"Josh Boyer" <jwboyer@...il.com>
To:	"Roland McGrath" <roland@...hat.com>
Cc:	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>, john.blackwood@...r.com,
	linux-kernel@...r.kernel.org,
	"Sven-Thorsten Dietrich" <sdietrich@...ell.com>, bugsy@...r.com
Subject: Re: [RFC] [PATCH] selective signal ptracing

On 6/16/07, Roland McGrath <roland@...hat.com> wrote:
> > What are the issues with arch like ARM ?
>
> The interesting class ARM belongs to is machines that don't (or don't
> always) have hardware support for single-step.  Maintaining the status quo
> of how PTRACE_SINGLESTEP functions on these machines is different in
> implementation under utrace than it is for machines that always use
> hardware support.  That is the only special complication for ARM, and it is
> not really very complicated.  Apparently the way I described the issue in
> the past was easily misunderstood.

That isn't just ARM.  There are some embedded PowerPC chips that lack
an easily usable hardware single step.  Just an FYI.

josh
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