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Date: Thu, 15 May 2014 08:52:04 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: chrubis@...e.cz, "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com> CC: Darren Hart <dvhart@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>, Jakub Jelinek <jakub@...hat.com>, "linux-man@...r.kernel.org" <linux-man@...r.kernel.org>, lkml <linux-kernel@...r.kernel.org>, Davidlohr Bueso <davidlohr.bueso@...com>, Arnd Bergmann <arnd@...db.de>, Steven Rostedt <rostedt@...dmis.org>, Peter Zijlstra <peterz@...radead.org>, Linux API <linux-api@...r.kernel.org>, "Carlos O'Donell" <carlos@...hat.com> Subject: Re: futex(2) man page update help request On 05/15/2014 08:42 AM, chrubis@...e.cz wrote: > Hi! >> People have a number of times noted that there are problems >> with syscall(), but I'm not knowledgeable on the details. >> I'd happily take a patch to the man page (which, for historical >> reasons, is actually syscall(2)) that explains the the problems >> (and ideally notes those platforms where there are no problems). > > Have a look at this commit that tries to deal with passing 64 bit > numbers to syscalls. On 32 bit ABI (but not on X32) these needs to be > split up (accordingly to machine endianity). > > https://github.com/linux-test-project/ltp/commit/04afb02b4280a20c262054e8f99a3fad4ad54916 > That is wrong, too. That assumes that there will never be padding words, which isn't true in the general case, either. I really believe the proper fix is to use assembly syscall stubs. In klibc I build a fairly elaborate machinery to autogenerate such syscall stubs for a variety of architectures. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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