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Subject[PATCH 07/13] x86/crypto/sha_ni: Standardize stack alignment prologue
Date
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>
---
arch/x86/crypto/sha1_ni_asm.S | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/crypto/sha1_ni_asm.S b/arch/x86/crypto/sha1_ni_asm.S
index 11efe3a45a1f..5d8415f482bd 100644
--- a/arch/x86/crypto/sha1_ni_asm.S
+++ b/arch/x86/crypto/sha1_ni_asm.S
@@ -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)
--
2.29.2
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