[cfe-dev] Weird ud2 generation

Joerg Sonnenberger via cfe-dev cfe-dev at lists.llvm.org
Sun Aug 14 11:59:26 PDT 2016


On Sun, Aug 14, 2016 at 01:43:43PM -0500, via cfe-dev wrote:
> I’m wondering if either a) someone recognizes this off the bat as
> something Clang uses for some purpose, or b) if someone with more
> experience with Clang, or the V8 codebase could help with solving?
> The part where it’s related to the kernel version is what’s really throwing me off... 

ud2 is used for __builtin_trap() and a few other cases of implicit stop
instructions. But the most likely candidate is the former. A good start
for further debugging on your part is the -save-temps output. It should
created annotated assembly, giving you some clue for where the
instruction comes from.

Joerg


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