Messages in this thread | | | Date | Thu, 22 Oct 2020 21:09:14 +0100 | From | Al Viro <> | Subject | Re: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" |
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On Thu, Oct 22, 2020 at 09:06:29PM +0100, Al Viro wrote: > On Thu, Oct 22, 2020 at 08:24:58PM +0100, Al Viro wrote: > > > Depending upon the calling conventions, compiler might do truncation in caller or > > in a callee, but it must be done _somewhere_. > > Unless I'm misreading AAPCS64, > "Unlike in the 32-bit AAPCS, named integral values must be narrowed by the callee > rather than the caller" > in 6.4.2 means that callee must not _not_ expect the upper 32 bits of %x0..%x7 to contain
Sorry, artefact of editing - that's
"in 6.4.2 means that callee must _not_ expect the upper 32 bits of %x0..%x7 to contain"
obviously.
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