Messages in this thread | | | Date | Thu, 15 May 2014 08:52:04 -0700 | From | "H. Peter Anvin" <> | Subject | Re: futex(2) man page update help request |
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On 05/15/2014 08:42 AM, chrubis@suse.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
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