Messages in this thread | | | Date | Wed, 30 Jun 2010 15:40:51 +0100 (BST) | From | "Maciej W. Rozycki" <> | Subject | Re: [GIT PULL] x86 breakpoint regression fix |
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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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