Al Viro wrote:
> On Wed, Jul 25, 2007 at 09:56:12AM -0700, Linus Torvalds wrote:
>>
>> On Tue, 24 Jul 2007, David Miller wrote:
>>> From: Jeremy Fitzhardinge <[email protected]>
>>> Date: Tue, 24 Jul 2007 23:24:55 -0700
>>>
>>>> H. Peter Anvin wrote:
>>>>> How far back was __builtin_trap() supported?
>>>> I think its relatively recent, but it might be within our supported
>>>> compiler window.
>>> I'm pretty sure it is.
>> .. and I'm pretty sure it's immaterial.
>>
>> 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.
>
> Umm... Actually, we might be able to do something like
> {
> l: __builtin_trap();
> static struct ... v __attribute__((section(...))) = { &&l, n, file };
> }
>
> except that it would need block-local labels and those are ugly (so's
> &&<label>, while we are at it)...
I thought gcc was buggy when it came to passing &&labels to assembly.
-hpa
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
