On Wed, 13 Feb 2013 16:00:06 +0200 Konstantin Belousov <kostik...@gmail.com> wrote:
> On Wed, Feb 13, 2013 at 10:25:46PM +1300, Andrew Turner wrote: > > On Tue, 12 Feb 2013 08:32:23 -0600 > > Nathan Whitehorn <nwhiteh...@freebsd.org> wrote: > > > > > A related question to these commits: are EABI binaries > > > incompatible with systems built for OABI? And vice versa? If so, > > > should we mint a new MACHINE_ARCH for ARM EABI (or OABI, I > > > guess)? The usual implication of sharing a uname -p string is > > > that systems can run each other's binaries -- that being broken > > > is a strong argument for a new value. -Nathan > > > > Yes OABI and EABI are binary incompatible. The plan is to kill off > > OABI at some stage in the future when EABI is ready. At some time > > in the future I plan on flipping the switch to make EABI the > > default but keep OABI around to allow people a chance to update. > > > > I am relying on ARM being a Tier 2 platform to change the ABI such > > that we break backward compatibility without changing uname -p. I > > have the start of a compat layer in the EABI project branch however > > never finished it. If people are interested in updating this > > compatibility layer I can point them at the code. > > > > The other point is backwards compatibility should only be an issue > > for ARMv4 and ARMv5 as these are the only cores we have support for > > on the any of the current release branches. ARMv6 and ARMv7 is > > added to 10 and there has not been an MFC to any of the stable > > branches. Because of this I have even less hesitation to stitch the > > ABI for TARGET_ARCH=armv6. > > > > In summary my plan is: > > < 9: No change > > >= 10: Switch to EABI and remove or depricate OABI > > Does the ABI change happen for the interfaces exported both by > usermode components and kernel, or only usermode components ? Or, > does the kernel exported ABI supports both OABI and EABI ? The ABI change happens on both interfaces. The kernel only exposes a single ABI. For a kernel built with EABI it will be EABI. I started a compat layer to export OABI on EABI kernels however never finished it. If someone is interested in finishing it I can point them to the code. Andrew _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
