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From: Stephane Eranian <eranian@hpl.hp.com>
To: linux-kernel@vger.kernel.org
Cc: Stephane Eranian <eranian@hpl.hp.com>
Subject: ptrace denies access to EFLAGS_RF
Date: Thu, 5 Jan 2006 02:51:30 -0800	[thread overview]
Message-ID: <20060105105130.GC3712@frankl.hpl.hp.com> (raw)

Hello,

I am trying to the user HW debug registers on i386
and I am running into a problem with ptrace() not allowing access
to EFLAGS_RF for POKEUSER (see FLAG_MASK).

I am not sure I understand the motivation for denying access
to this flag which can be used to resume after a code
breakpoint has been reached. It avoids the need to remove the
breakpoint, single step, and reinstall. The equivalent
functionality exists on IA-64 and is allowed by ptrace().

Why is EFLAGS_RF not accessible to users on i386?

Thanks.

-- 
-Stephane

             reply	other threads:[~2006-01-05 10:53 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-05 10:51 Stephane Eranian [this message]
2006-01-06  4:11 Chuck Ebbert
2006-01-06  9:39 ` Stephane Eranian
2006-01-06 14:02 ` Stephane Eranian
2006-01-06 16:10 Chuck Ebbert
2006-01-12 22:11 ` Stephane Eranian

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