tberghammer added a comment.

In http://reviews.llvm.org/D16772#340950, @clayborg wrote:

> Looks good.
>
> A related comment about IT instructions. You need to be careful when software 
> single stepping through instructions that are in the middle of an ITSTATE 
> block. You can NOT use a 16 bit instruction that isn't a BKPT otherwise you 
> change your instructions. Are you guys using the BKPT trap for software 
> breakpoints? If not, you should not step through IT instructions that have 32 
> bit thumb instructions or you will hose your program. Let me know if you need 
> to know more about this.


We are currently using 16 bit UDF instruction and as far as I can tell from 
some manual testing it is working as expected both when stepping over 16 bit 
and when stepping over 32 bit instructions. I will look into it why we are 
using UDF instead of BKPT and will create a separate CL for replacing it.

In http://reviews.llvm.org/D16772#341030, @omjavaid wrote:

> Looks good. Was there a test failing in testsuite due to this?


I detected the issue based on TestStandardUnwind but we have no test exercising 
this feature directly.

P.S.: TestStandardUnwind still failing on some android arm devices because we 
don't handle the IT instruction for unwinding either. I am working on a fix for 
that as well.


http://reviews.llvm.org/D16772



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