From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
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 15:40:51 +0100 (BST) [thread overview]
Message-ID: <alpine.LFD.2.00.1006301535480.13070@eddie.linux-mips.org> (raw)
In-Reply-To: <1277906559-10624-1-git-send-regression-fweisbec@gmail.com>
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).
Maciej
next prev parent reply other threads:[~2010-06-30 14:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-30 14:02 Frederic Weisbecker
2010-06-30 14:18 ` Frederic Weisbecker
2010-06-30 18:43 ` Ingo Molnar
2010-06-30 14:40 ` Maciej W. Rozycki [this message]
2010-06-30 19:04 ` Frederic Weisbecker
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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