[lkml]   [2018]   [Feb]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [linus:master] BUILD REGRESSION a2e5790d841658485d642196dbb0927303d6c22f
On Wed, Feb 7, 2018 at 10:38 AM, Randy Dunlap <> wrote:
> On 02/07/2018 10:13 AM, Linus Torvalds wrote:
>> That said, intel only _documents_ UD2 (0f 0b).
> Intel Order Number: 325383-064US, October 2017, documents UD0, UD1, and UD2.
> Section A.2.5, Table A-1, says:

Ahh, I had an older version.

Looking at the latest one I can find (325462-065US), it does specify
that it has a modrm byte:

0F FF /r UD0 1 r32, r/m32

so I think that our opcode maps are wrong, and it's a bit dangerous to
put random constants right after the UD0.

Maybe we should make our use of UD0 have a third byte: add a harmless
modrm byte before the warning constants?

But yes, at least my objdump just thinks it's a bad 2-byte sequence,
and doesn't look at any modrm bytes at all.


 \ /
  Last update: 2018-02-07 20:02    [W:0.089 / U:0.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site