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From
SubjectRe: [PATCH] 2.4.0 i386 watchpoint problems
Date
Followup to:  <Pine.LNX.4.10.10009221122090.1647-100000@penguin.transmeta.com>
By author: Linus Torvalds <torvalds@transmeta.com>
In newsgroup: linux.dev.kernel
>
> Remember: debug traps work even without debuggers. You can use a "int 3"
> in your program if you want to have self-debug somewhere. Not many people
> do it, of course, but there's nothing fundamentally wrong in just catching
> SIGTRAP yourself, and doing something special on debug events.
>

This is sometimes used to patch code at runtime, since it's a
single-byte instruction.

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt
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