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x86/crypto/sha1_avx2: Standardize stack alignment prologue 

Use a more standard prologue for saving the stack pointer before
realigning the stack.

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/fdaaf8670ed1f52f55ba9a6bbac98c1afddc1af6.1614182415.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2021-02-24 10:29:21 -06:00
parent 35a0067d2c
commit 20114c899c
1 changed files with 4 additions and 4 deletions
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8
arch/x86/crypto/sha1_avx2_x86_64_asm.S
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@ -645,9 +645,9 @@ _loop3:
RESERVE_STACK = (W_SIZE*4 + 8+24)
/* Align stack */
mov %rsp, %rbx
push %rbp
mov %rsp, %rbp
and $~(0x20-1), %rsp
push %rbx
sub $RESERVE_STACK, %rsp
avx2_zeroupper
@ -665,8 +665,8 @@ _loop3:
avx2_zeroupper
add $RESERVE_STACK, %rsp
pop %rsp
mov %rbp, %rsp
pop %rbp
pop %r15
pop %r14