Commit 35a0067d authored by Josh Poimboeuf's avatar Josh Poimboeuf
Browse files

x86/crypto/sha_ni: 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: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Tested-by: default avatarArd Biesheuvel <ardb@kernel.org>
Acked-by: default avatarArd Biesheuvel <ardb@kernel.org>
Tested-by: default avatarSami Tolvanen <samitolvanen@google.com>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/5033e1a79867dff1b18e1b4d0783c38897d3f223.1614182415.git.jpoimboe@redhat.com
parent 2b02ed55

arch/x86/crypto/sha1_ni_asm.S

+4 −4
Original line number Diff line number Diff line
@@ -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)