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    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


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