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    SubjectRe: [GIT PULL] x86 breakpoint regression fix
    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.



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