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x86/crypto/sha256-avx2: Standardize stack alignment prologue

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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/8048e7444c49a8137f05265262b83dc50f8fb7f3.1614182415.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2021-02-24 10:29:22 -06:00
parent 20114c899c
commit ce58466680
1 changed files with 6 additions and 7 deletions
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13
arch/x86/crypto/sha256-avx2-asm.S
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@ -117,15 +117,13 @@ _XMM_SAVE_SIZE = 0
_INP_END_SIZE = 8
_INP_SIZE = 8
_CTX_SIZE = 8
_RSP_SIZE = 8
_XFER = 0
_XMM_SAVE = _XFER + _XFER_SIZE
_INP_END = _XMM_SAVE + _XMM_SAVE_SIZE
_INP = _INP_END + _INP_END_SIZE
_CTX = _INP + _INP_SIZE
_RSP = _CTX + _CTX_SIZE
STACK_SIZE = _RSP + _RSP_SIZE
STACK_SIZE = _CTX + _CTX_SIZE
# rotate_Xs
# Rotate values of symbols X0...X3
@ -533,11 +531,11 @@ SYM_FUNC_START(sha256_transform_rorx)
pushq %r14
pushq %r15
mov %rsp, %rax
push %rbp
mov %rsp, %rbp
subq $STACK_SIZE, %rsp
and $-32, %rsp # align rsp to 32 byte boundary
mov %rax, _RSP(%rsp)
shl $6, NUM_BLKS # convert to bytes
jz done_hash
@ -704,7 +702,8 @@ only_one_block:
done_hash:
mov _RSP(%rsp), %rsp
mov %rbp, %rsp
pop %rbp
popq %r15
popq %r14