Al Viro wrote:
> On Wed, Jul 25, 2007 at 09:56:12AM -0700, Linus Torvalds wrote:
>
>> We don't just do the "ud2" instruction - we also do the file and line
>> number information after it. Which means that __builtin_trap() is useless.
>>
>> So we might as well keep the loop, since both are two-byte instructions
>> that tell gcc that it will never continue.
>>
>
> Actually, the worse problem is that gcc will happily merge these guys.
> And that's a killer.
>
Merge __builtin_traps()? Ugh. But also, there's no real long-term
guarantee that it will keep generating ud2a. The *only* mention of it
in the manual is a discussion that it will emit a call to abort() on
arches which don't otherwise support it.
J
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