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x86/crypto/sha1_avx2: 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 <[email protected]>
Tested-by: Ard Biesheuvel <[email protected]>
Acked-by: Ard Biesheuvel <[email protected]>
Tested-by: Sami Tolvanen <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Herbert Xu <[email protected]>
Link: https://lore.kernel.org/r/fdaaf8670ed1f52f55ba9a6bbac98c1afddc1af6.1614182415.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf committed 2021-04-19 12:36:35 -05:00
1 parent 35a0067d2c
commit 20114c899c
1 file changed
+4 -4
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arch/x86/crypto/sha1_avx2_x86_64_asm.S
+4 -4
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@@ -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