diff mbox series

[08/13] x86/crypto/sha1_avx2: Standardize stack alignment prologue

Message ID fdaaf8670ed1f52f55ba9a6bbac98c1afddc1af6.1614182415.git.jpoimboe@redhat.com
State Accepted
Commit 20114c899cafa8313534a841cab0ab1f7ab09672
Headers show
Series x86/crypto/asm: objtool support | expand

Commit Message

Josh Poimboeuf Feb. 24, 2021, 4:29 p.m. UTC 
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_avx2_x86_64_asm.S | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/crypto/sha1_avx2_x86_64_asm.S b/arch/x86/crypto/sha1_avx2_x86_64_asm.S
index 1e594d60afa5..5eed620f4676 100644
--- a/arch/x86/crypto/sha1_avx2_x86_64_asm.S
+++ b/arch/x86/crypto/sha1_avx2_x86_64_asm.S
@@ -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