crypto: x86/sha1-avx2 - Fix RBP usage
authorJosh Poimboeuf <jpoimboe@redhat.com>
Mon, 18 Sep 2017 19:42:05 +0000 (14:42 -0500)
committerHerbert Xu <herbert@gondor.apana.org.au>
Wed, 20 Sep 2017 09:42:34 +0000 (17:42 +0800)
commitd7b1722c72aa915283ada27709c6feeb392f6038
treea5b78c49b6286a2d189c56da289a2b2a9b79329a
parent3ed7b4d67c6745300c9b5c6baa55da1161b57f60
crypto: x86/sha1-avx2 - Fix RBP usage

Using RBP as a temporary register breaks frame pointer convention and
breaks stack traces when unwinding from an interrupt in the crypto code.

Use R11 instead of RBP.  Since R11 isn't a callee-saved register, it
doesn't need to be saved and restored on the stack.

Reported-by: Eric Biggers <ebiggers@google.com>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Tested-by: Eric Biggers <ebiggers@google.com>
Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
arch/x86/crypto/sha1_avx2_x86_64_asm.S