crypto: x86/cast5 - 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 R15 instead of RBP. R15 can't be used as the RID1 register because of x86 instruction encoding limitations. So use R15 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: NEric Biggers <ebiggers@google.com> Reported-by: NPeter Zijlstra <peterz@infradead.org> Tested-by: NEric Biggers <ebiggers@google.com> Acked-by: NEric Biggers <ebiggers@google.com> Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
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