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SubjectRe: [PATCH 00/12] x86/crypto: Fix RBP usage in several crypto .S files
On Fri, Sep 01, 2017 at 05:09:19PM -0700, Eric Biggers wrote:
> Hi Josh,
>
> On Tue, Aug 29, 2017 at 01:05:33PM -0500, Josh Poimboeuf wrote:
> > Many of the x86 crypto functions use RBP as a temporary register. This
> > breaks frame pointer convention, and breaks stack traces when unwinding
> > from an interrupt in the crypto code.
> >
> > Convert most* of them to leave RBP alone.
> >
> > These pass the crypto boot tests for me. Any further testing would be
> > appreciated!
> >
> > [*] There are still a few crypto files left that need fixing, but the
> > fixes weren't trivial and nobody reported unwinder warnings about
> > them yet, so I'm skipping them for now.
> >
> > Josh Poimboeuf (12):
> > x86/crypto: Fix RBP usage in blowfish-x86_64-asm_64.S
> > x86/crypto: Fix RBP usage in camellia-x86_64-asm_64.S
> > x86/crypto: Fix RBP usage in cast5-avx-x86_64-asm_64.S
> > x86/crypto: Fix RBP usage in cast6-avx-x86_64-asm_64.S
> > x86/crypto: Fix RBP usage in des3_ede-asm_64.S
> > x86/crypto: Fix RBP usage in sha1_avx2_x86_64_asm.S
> > x86/crypto: Fix RBP usage in sha1_ssse3_asm.S
> > x86/crypto: Fix RBP usage in sha256-avx-asm.S
> > x86/crypto: Fix RBP usage in sha256-avx2-asm.S
> > x86/crypto: Fix RBP usage in sha256-ssse3-asm.S
> > x86/crypto: Fix RBP usage in sha512-avx2-asm.S
> > x86/crypto: Fix RBP usage in twofish-avx-x86_64-asm_64.S
> >
>
> Thanks for fixing these! I don't have time to review these in detail, but I ran
> the crypto self-tests on the affected algorithms, and they all pass. I also
> benchmarked them before and after; the only noticable performance difference was
> that sha256-avx2 and sha512-avx2 became a few percent slower. I don't suppose
> there is a way around that? Otherwise it's probably not a big deal.

Thanks for testing. I might have a way to make sha256-avx2 faster, but
not sha512-avx2. I'll let you know when I have a patch.

--
Josh

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