Commit 20114c89 authored Feb 24, 2021 by Josh Poimboeuf

x86/crypto/sha1_avx2: 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: 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/fdaaf8670ed1f52f55ba9a6bbac98c1afddc1af6.1614182415.git.jpoimboe@redhat.com

parent 35a0067d

arch/x86/crypto/sha1_avx2_x86_64_asm.S

+4 −4

Original line number	Diff line number	Diff line
		@@ -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