tree 3ca1e7bf788cdc1a2c3f3b5e58e0cf7f4d99e1e2
parent 673ac6fbc74f835e2125df9ee39e8a2a423832e2
author Josh Poimboeuf <jpoimboe@redhat.com> 1505763728 -0500
committer Herbert Xu <herbert@gondor.apana.org.au> 1505900556 +0800

crypto: x86/sha256-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.

There's no need to use RBP as a temporary register for the TBL value,
because it always stores the same value: the address of the K256 table.
Instead just reference the address of K256 directly.

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>