On Fri, Jan 20, 2017 at 08:35:14AM +0100, Sebastian Huber wrote: > >so you seem to have 64-bit ABI_V4? I wonder how well tested that is, > >you are likely to run into more problems. Either stack_restore_tie or > >the above code will need a tweak. > > thanks for your help. I would had a hard time to figure this out myself. > > I am flexible in terms of the ABI choice for the 64-bit PowerPC. I guess > the ABI_ELFv2 is the way to go?
It certainly is the most modern ABI. It makes some requirements to what Power ISA features are required, which may or may not be a problem for your platform. If you want to use BE, that should work with ELFv2 fine (and it did in the past at least), but it doesn't get serious testing. > I had to provide SUBSUBTARGET_OVERRIDE_OPTIONS in rtems.h (in > config/rs6000/) to set the ABI. The sysv4.h doesn't care about > -mabi=elfv2. There seems to be some copy and paste in linux64.h and > freebsd64.h for their SUBSUBTARGET_OVERRIDE_OPTIONS. Maybe the common > stuff should move to sysv4.h? sysv4 is not ELFv2, it is a separate ABI. Perhaps there should be an elfv2.h header, sure. Segher
