crypto: x86/twofish - Fix RBP usage

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

Use R13 instead of RBP.  Both are callee-saved registers, so the
substitution is straightforward.

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>

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Josh Poimboeuf 2017-09-18 14:42:11 -05:00 • committed by Herbert Xu

parent ca04c82376

commit 8f182f845d

1 changed files with 6 additions and 6 deletions

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arch/x86/crypto/twofish-avx-x86_64-asm_64.S

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