lkml.org 
[lkml]   [2010]   [Jun]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [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


\
 
 \ /
  Last update: 2010-06-30 16:43    [from the cache]
©2003-2011 Jasper Spaans