Re: hf/sf [Was Re: CVS commit: pkgsrc/misc/raspberrypi-userland]

[Matt Thomas <matt%3am-software.com@localhost>]

On Nov 11, 2013, at 8:33 PM, Warner Losh <imp%bsdimp.com@localhost> wrote:

> Is there a complete write up of the conventions here?

Conventions?

earm{v[4567],}{hf,}{eb}  except earmv4hf isn’t valid.

Due to recent GCC changes, the earmv6* and earmv7* not only will have 
instructions that execute on pre-armv6 CPUs they will do unaligned accesses 
which will handled by the CPU transparently.  These unaligned accesses are not 
supported by pre-armv6 CPUs.

That’s yet another ABI permutation.  The kernel could fix them up but at 
significant cost.