On Sun, Aug 21, 2011 at 06:41:16PM -0700, Linus Torvalds wrote: > On Sun, Aug 21, 2011 at 6:16 PM, Al Viro <v...@zeniv.linux.org.uk> wrote: > > > > Is that ability a part of userland ABI or are we declaring that hopelessly > > wrong and require to go through the function in vdso32? ?Linus? > > If people are using syscall directly, we're pretty much stuck. No > amount of "that's hopelessly wrong" will ever matter. We don't break > existing binaries.
There's a funny part, though - such binary won't work on 32bit kernel. AFAICS, we never set MSR_*STAR on 32bit kernels (and native 32bit vdso doesn't provide a SYSCALL-based variant). So if we really consider such SYSCALL outside of vdso32 kosher, shouldn't we do something with entry_32.S as well? I don't think it's worth doing, TBH... Again, I very much hope that binaries with such stray SYSCALL simply do not exist. In theory it's possible to write one, but... IIRC, the reason we never had SYSCALL support in 32bit kernel was the utter lack of point - the *only* CPU where it would matter would be K6-2, IIRC, and (again, IIRC) it had some differences in SYSCALL semantics compared to K7 (which supports SYSENTER as well). Bugger if I remember what those differences might've been... Some flag not cleared? ------------------------------------------------------------------------------ uberSVN's rich system and user administration capabilities and model configuration take the hassle out of deploying and managing Subversion and the tools developers use with it. Learn more about uberSVN and get a free download at: http://p.sf.net/sfu/wandisco-dev2dev _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
