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x86/crypto/aesni-intel_avx: Standardize stack alignment prologue

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Use RBP instead of R14 for saving the old stack pointer before
realignment.  This resembles what compilers normally do.

This enables ORC unwinding by allowing objtool to understand the stack
realignment.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/02d00a0903a0959f4787e186e2a07d271e1f63d4.1614182415.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2021-02-24 10:29:17 -06:00
parent ff5796b6db
commit e163be86ff
1 changed files with 4 additions and 6 deletions
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10
arch/x86/crypto/aesni-intel_avx-x86_64.S
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@ -251,22 +251,20 @@ VARIABLE_OFFSET = 16*8
.macro FUNC_SAVE
push %r12
push %r13
push %r14
push %r15
mov %rsp, %r14
push %rbp
mov %rsp, %rbp
sub $VARIABLE_OFFSET, %rsp
and $~63, %rsp # align rsp to 64 bytes
.endm
.macro FUNC_RESTORE
mov %r14, %rsp
mov %rbp, %rsp
pop %rbp
pop %r15
pop %r14
pop %r13
pop %r12
.endm