crypto: x86/sha1-avx2 - 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 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>

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

parent 3ed7b4d67c

commit d7b1722c72

1 changed files with 1 additions and 3 deletions

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arch/x86/crypto/sha1_avx2_x86_64_asm.S

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