Re: [GIT PULL] x86 breakpoint regression fix

[Maciej W. Rozycki]

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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