On Sunday, March 26, 2017 08:36:56 AM Michal Meloun wrote:
> Author: mmel
> Date: Sun Mar 26 08:36:56 2017
> New Revision: 315974
> URL: https://svnweb.freebsd.org/changeset/base/315974
> 
> Log:
>   Preserve VFP state across signal delivery.
>   
>   We don't have enouch space to store full VFP context within mcontext
>   stucture. Due to this:
>    - follow i386/amd64 way and store VFP state outside of the mcontext_t
>      but point to it. Use the size of VFP state structure as an 'magic'
>      indicator of the saved VFP state presence.
>    - teach set_mcontext() about this external storage.
>    - for signal delivery, store VFP state to expanded 'struct sigframe'.
>   
>   Submited by:        Andrew Gierth (initial version)
>   PR:         217611
>   MFC after:  2 weeks
> 
> Modified:
>   head/lib/libthread_db/arch/arm/libpthread_md.c
>   head/sys/arm/arm/machdep.c
>   head/sys/arm/include/frame.h
>   head/sys/arm/include/ucontext.h
> 
> Modified: head/lib/libthread_db/arch/arm/libpthread_md.c
> ==============================================================================
> --- head/lib/libthread_db/arch/arm/libpthread_md.c    Sun Mar 26 08:36:20 
> 2017        (r315973)
> +++ head/lib/libthread_db/arch/arm/libpthread_md.c    Sun Mar 26 08:36:56 
> 2017        (r315974)
> @@ -90,7 +90,9 @@ pt_fpreg_to_ucontext(const struct fpreg 
>       mcontext_t *mc = &uc->uc_mcontext;
>  
>       /* XXX */
> -     memset(&mc->mc_spare, 0, sizeof(mc->mc_spare));
> +     mc->mc_vfp_size = 0;
> +     mc->mc_vfp_ptr = NULL;
> +     memset(mc->mc_spare, 0, sizeof(mc->mc_spare));
>  }

I suspect you don't need this bit?  Has FreeBSD/arm ever supported VFP on a 
release
that also shipped libkse?  (i.e. not libthr but the other thread library)

-- 
John Baldwin
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