crypto: x86/blowfish - 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 R12 instead of RBP.  R12 can't be used as the RT0 register because
of x86 instruction encoding limitations.  So use R12 for CTX and RDI for
CTX.  This means that CTX is no longer an implicit function argument.
Instead it needs to be explicitly copied from RDI.

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 14:42:00 -05:00 • committed by Herbert Xu

parent bd6227a150

commit 569f11c9f7

1 changed files with 26 additions and 22 deletions

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arch/x86/crypto/blowfish-x86_64-asm_64.S

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