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x86/crypto/sha_ni: 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/5033e1a79867dff1b18e1b4d0783c38897d3f223.1614182415.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2021-02-24 10:29:20 -06:00
parent 2b02ed5548
commit 35a0067d2c
1 changed files with 4 additions and 4 deletions
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8
arch/x86/crypto/sha1_ni_asm.S
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@ -59,8 +59,6 @@
#define DATA_PTR %rsi /* 2nd arg */
#define NUM_BLKS %rdx /* 3rd arg */
#define RSPSAVE %rax
/* gcc conversion */
#define FRAME_SIZE 32 /* space for 2x16 bytes */
@ -96,7 +94,8 @@
.text
.align 32
SYM_FUNC_START(sha1_ni_transform)
mov %rsp, RSPSAVE
push %rbp
mov %rsp, %rbp
sub $FRAME_SIZE, %rsp
and $~0xF, %rsp
@ -288,7 +287,8 @@ SYM_FUNC_START(sha1_ni_transform)
pextrd $3, E0, 1*16(DIGEST_PTR)
.Ldone_hash:
mov RSPSAVE, %rsp
mov %rbp, %rsp
pop %rbp
ret
SYM_FUNC_END(sha1_ni_transform)