Messages in this thread | | | Date | Sat, 7 Sep 2002 03:29:58 +0000 | From | Pavel Machek <> | Subject | Re: [PATCH][2.4.20-pre5] non syscall gettimeofday |
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Hi!
> > This sounds like a vsyscall. Since we have discussed vsyscalls on and > > off without getting anywhere, I'd like to know how your implementation > > does it -- the #1 proposal I think was to map in a page at 0xfffff000 > > and have the vsyscall code there. > > Id like to do a similar thing on ppc32 and ppc64. It would be good to > make some of this generic before everyone implements it their own way. > > Of course the lower level stuff will be arch specific, but some of it > could be the same (like how do we handle ptracing into the area? Do > we COW or do we deny it and fix gdb to unsderstand vsyscalls).
It is already implemented on x86-64.
AFAIR putting breakpoints into vsyscall area is not permitted. Pavel -- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
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