linux-kernel - Re: [GIT PULL] x86 breakpoint regression fix

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Message-ID: <alpine.LFD.2.00.1006301535480.13070@eddie.linux-mips.org>
Date:	Wed, 30 Jun 2010 15:40:51 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Alexandre Julliard <julliard@...ehq.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	"2 . 6 . 33 . x 2 . 6 . 34 . x" <stable@...nel.org>
Subject: Re: [GIT PULL] x86 breakpoint regression fix

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
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