From: Frederic Weisbecker <fweisbec@gmail.com>
To: "Maciej W. Rozycki" <macro@linux-mips.org>
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
Alexandre Julliard <julliard@winehq.org>,
"H . Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Prasad <prasad@linux.vnet.ibm.com>,
"2 . 6 . 33 . x 2 . 6 . 34 . x" <stable@kernel.org>
Subject: Re: [GIT PULL] x86 breakpoint regression fix
Date: Wed, 30 Jun 2010 21:04:08 +0200 [thread overview]
Message-ID: <20100630190405.GB5243@nowhere> (raw)
In-Reply-To: <alpine.LFD.2.00.1006301535480.13070@eddie.linux-mips.org>
On Wed, Jun 30, 2010 at 03:40:51PM +0100, Maciej W. Rozycki wrote:
> On Wed, 30 Jun 2010, Frederic Weisbecker wrote:
>
> > - icebp/int01 trap. This instruction (0xf1) is undocumented and
> > generates an int 1 exception. Unlike single step through TF
> > flag, it doesn't set the single step origin of the exception
> > in dr6.
>
> Not quite completely undocumented, but a bit obscure indeed. GDB calls
> this instruction ICEBP and some Intel sources -- INT1. It's been around
> for a while (at least since 80286) and is mostly used by in-circuit
> emulators (hence the name GDB uses).
Right, in fact it was quite easy to find any documentation about it, it's
just officially undocumented.
next prev parent reply other threads:[~2010-06-30 19:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-30 14:02 [GIT PULL] x86 breakpoint regression fix Frederic Weisbecker
2010-06-30 14:18 ` Frederic Weisbecker
2010-06-30 18:43 ` Ingo Molnar
2010-06-30 14:40 ` Maciej W. Rozycki
2010-06-30 19:04 ` Frederic Weisbecker [this message]
2010-06-30 22:23 ` Maciej W. Rozycki
2010-06-30 20:11 ` [PATCH -stable 2.6.33.x] x86: Send a SIGTRAP for user icebp traps Frederic Weisbecker
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